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Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }\r\n    function fulfill(value) { resume(\"next\", value); }\r\n    function reject(value) { resume(\"throw\", value); }\r\n    function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }\r\n}\r\n\r\nexport function __asyncDelegator(o) {\r\n    var i, p;\r\n    return i = {}, verb(\"next\"), verb(\"throw\", function (e) { throw e; }), verb(\"return\"), i[Symbol.iterator] = function () { return this; }, i;\r\n    function verb(n, f) { i[n] = o[n] ? function (v) { return (p = !p) ? { value: __await(o[n](v)), done: n === \"return\" } : f ? f(v) : v; } : f; }\r\n}\r\n\r\nexport function __asyncValues(o) {\r\n    if (!Symbol.asyncIterator) throw new TypeError(\"Symbol.asyncIterator is not defined.\");\r\n    var m = o[Symbol.asyncIterator], i;\r\n    return m ? m.call(o) : (o = typeof __values === \"function\" ? __values(o) : o[Symbol.iterator](), i = {}, verb(\"next\"), verb(\"throw\"), verb(\"return\"), i[Symbol.asyncIterator] = function () { return this; }, i);\r\n    function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }\r\n    function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }\r\n}\r\n\r\nexport function __makeTemplateObject(cooked, raw) {\r\n    if (Object.defineProperty) { Object.defineProperty(cooked, \"raw\", { value: raw }); } else { cooked.raw = raw; }\r\n    return cooked;\r\n};\r\n\r\nexport function __importStar(mod) {\r\n    if (mod && mod.__esModule) return mod;\r\n    var result = {};\r\n    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];\r\n    result.default = mod;\r\n    return result;\r\n}\r\n\r\nexport function __importDefault(mod) {\r\n    return (mod && mod.__esModule) ? mod : { default: mod };\r\n}\r\n\r\nexport function __classPrivateFieldGet(receiver, privateMap) {\r\n    if (!privateMap.has(receiver)) {\r\n        throw new TypeError(\"attempted to get private field on non-instance\");\r\n    }\r\n    return privateMap.get(receiver);\r\n}\r\n\r\nexport function __classPrivateFieldSet(receiver, privateMap, value) {\r\n    if (!privateMap.has(receiver)) {\r\n        throw new TypeError(\"attempted to set private field on non-instance\");\r\n    }\r\n    privateMap.set(receiver, value);\r\n    return value;\r\n}\r\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nexport type LogLevelString =\n  | 'debug'\n  | 'verbose'\n  | 'info'\n  | 'warn'\n  | 'error'\n  | 'silent';\n\nexport interface LogOptions {\n  level: LogLevelString;\n}\n\nexport type LogCallback = (callbackParams: LogCallbackParams) => void;\n\nexport interface LogCallbackParams {\n  level: LogLevelString;\n  message: string;\n  args: unknown[];\n  type: string;\n}\n\n/**\n * A container for all of the Logger instances\n */\nexport const instances: Logger[] = [];\n\n/**\n * The JS SDK supports 5 log levels and also allows a user the ability to\n * silence the logs altogether.\n *\n * The order is a follows:\n * DEBUG < VERBOSE < INFO < WARN < ERROR\n *\n * All of the log types above the current log level will be captured (i.e. if\n * you set the log level to `INFO`, errors will still be logged, but `DEBUG` and\n * `VERBOSE` logs will not)\n */\nexport enum LogLevel {\n  DEBUG,\n  VERBOSE,\n  INFO,\n  WARN,\n  ERROR,\n  SILENT\n}\n\nconst levelStringToEnum: { [key in LogLevelString]: LogLevel } = {\n  'debug': LogLevel.DEBUG,\n  'verbose': LogLevel.VERBOSE,\n  'info': LogLevel.INFO,\n  'warn': LogLevel.WARN,\n  'error': LogLevel.ERROR,\n  'silent': LogLevel.SILENT\n};\n\n/**\n * The default log level\n */\nconst defaultLogLevel: LogLevel = LogLevel.INFO;\n\n/**\n * We allow users the ability to pass their own log handler. We will pass the\n * type of log, the current log level, and any other arguments passed (i.e. the\n * messages that the user wants to log) to this function.\n */\nexport type LogHandler = (\n  loggerInstance: Logger,\n  logType: LogLevel,\n  ...args: unknown[]\n) => void;\n\n/**\n * By default, `console.debug` is not displayed in the developer console (in\n * chrome). To avoid forcing users to have to opt-in to these logs twice\n * (i.e. once for firebase, and once in the console), we are sending `DEBUG`\n * logs to the `console.log` function.\n */\nconst ConsoleMethod = {\n  [LogLevel.DEBUG]: 'log',\n  [LogLevel.VERBOSE]: 'log',\n  [LogLevel.INFO]: 'info',\n  [LogLevel.WARN]: 'warn',\n  [LogLevel.ERROR]: 'error'\n};\n\n/**\n * The default log handler will forward DEBUG, VERBOSE, INFO, WARN, and ERROR\n * messages on to their corresponding console counterparts (if the log method\n * is supported by the current log level)\n */\nconst defaultLogHandler: LogHandler = (instance, logType, ...args): void => {\n  if (logType < instance.logLevel) {\n    return;\n  }\n  const now = new Date().toISOString();\n  const method = ConsoleMethod[logType as keyof typeof ConsoleMethod];\n  if (method) {\n    console[method as 'log' | 'info' | 'warn' | 'error'](\n      `[${now}]  ${instance.name}:`,\n      ...args\n    );\n  } else {\n    throw new Error(\n      `Attempted to log a message with an invalid logType (value: ${logType})`\n    );\n  }\n};\n\nexport class Logger {\n  /**\n   * Gives you an instance of a Logger to capture messages according to\n   * Firebase's logging scheme.\n   *\n   * @param name The name that the logs will be associated with\n   */\n  constructor(public name: string) {\n    /**\n     * Capture the current instance for later use\n     */\n    instances.push(this);\n  }\n\n  /**\n   * The log level of the given Logger instance.\n   */\n  private _logLevel = defaultLogLevel;\n  get logLevel(): LogLevel {\n    return this._logLevel;\n  }\n  set logLevel(val: LogLevel) {\n    if (!(val in LogLevel)) {\n      throw new TypeError('Invalid value assigned to `logLevel`');\n    }\n    this._logLevel = val;\n  }\n\n  /**\n   * The main (internal) log handler for the Logger instance.\n   * Can be set to a new function in internal package code but not by user.\n   */\n  private _logHandler: LogHandler = defaultLogHandler;\n  get logHandler(): LogHandler {\n    return this._logHandler;\n  }\n  set logHandler(val: LogHandler) {\n    if (typeof val !== 'function') {\n      throw new TypeError('Value assigned to `logHandler` must be a function');\n    }\n    this._logHandler = val;\n  }\n\n  /**\n   * The optional, additional, user-defined log handler for the Logger instance.\n   */\n  private _userLogHandler: LogHandler | null = null;\n  get userLogHandler(): LogHandler | null {\n    return this._userLogHandler;\n  }\n  set userLogHandler(val: LogHandler | null) {\n    this._userLogHandler = val;\n  }\n\n  /**\n   * The functions below are all based on the `console` interface\n   */\n\n  debug(...args: unknown[]): void {\n    this._userLogHandler && this._userLogHandler(this, LogLevel.DEBUG, ...args);\n    this._logHandler(this, LogLevel.DEBUG, ...args);\n  }\n  log(...args: unknown[]): void {\n    this._userLogHandler &&\n      this._userLogHandler(this, LogLevel.VERBOSE, ...args);\n    this._logHandler(this, LogLevel.VERBOSE, ...args);\n  }\n  info(...args: unknown[]): void {\n    this._userLogHandler && this._userLogHandler(this, LogLevel.INFO, ...args);\n    this._logHandler(this, LogLevel.INFO, ...args);\n  }\n  warn(...args: unknown[]): void {\n    this._userLogHandler && this._userLogHandler(this, LogLevel.WARN, ...args);\n    this._logHandler(this, LogLevel.WARN, ...args);\n  }\n  error(...args: unknown[]): void {\n    this._userLogHandler && this._userLogHandler(this, LogLevel.ERROR, ...args);\n    this._logHandler(this, LogLevel.ERROR, ...args);\n  }\n}\n\nexport function setLogLevel(level: LogLevelString | LogLevel): void {\n  const newLevel = typeof level === 'string' ? levelStringToEnum[level] : level;\n  instances.forEach(inst => {\n    inst.logLevel = newLevel;\n  });\n}\n\nexport function setUserLogHandler(\n  logCallback: LogCallback | null,\n  options?: LogOptions\n): void {\n  for (const instance of instances) {\n    let customLogLevel: LogLevel | null = null;\n    if (options && options.level) {\n      customLogLevel = levelStringToEnum[options.level];\n    }\n    if (logCallback === null) {\n      instance.userLogHandler = null;\n    } else {\n      instance.userLogHandler = (\n        instance: Logger,\n        level: LogLevel,\n        ...args: unknown[]\n      ) => {\n        const message = args\n          .map(arg => {\n            if (arg == null) {\n              return null;\n            } else if (typeof arg === 'string') {\n              return arg;\n            } else if (typeof arg === 'number' || typeof arg === 'boolean') {\n              return arg.toString();\n            } else if (arg instanceof Error) {\n              return arg.message;\n            } else {\n              try {\n                return JSON.stringify(arg);\n              } catch (ignored) {\n                return null;\n              }\n            }\n          })\n          .filter(arg => arg)\n          .join(' ');\n        if (level >= (customLogLevel ?? instance.logLevel)) {\n          logCallback({\n            level: LogLevel[level].toLowerCase() as LogLevelString,\n            message,\n            args,\n            type: instance.name\n          });\n        }\n      };\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { CONSTANTS } from './constants';\n\n/**\n * Returns navigator.userAgent string or '' if it's not defined.\n * @return user agent string\n */\nexport function getUA(): string {\n  if (\n    typeof navigator !== 'undefined' &&\n    typeof navigator['userAgent'] === 'string'\n  ) {\n    return navigator['userAgent'];\n  } else {\n    return '';\n  }\n}\n\n/**\n * Detect Cordova / PhoneGap / Ionic frameworks on a mobile device.\n *\n * Deliberately does not rely on checking `file://` URLs (as this fails PhoneGap\n * in the Ripple emulator) nor Cordova `onDeviceReady`, which would normally\n * wait for a callback.\n */\nexport function isMobileCordova(): boolean {\n  return (\n    typeof window !== 'undefined' &&\n    // @ts-ignore Setting up an broadly applicable index signature for Window\n    // just to deal with this case would probably be a bad idea.\n    !!(window['cordova'] || window['phonegap'] || window['PhoneGap']) &&\n    /ios|iphone|ipod|ipad|android|blackberry|iemobile/i.test(getUA())\n  );\n}\n\n/**\n * Detect Node.js.\n *\n * @return true if Node.js environment is detected.\n */\n// Node detection logic from: https://github.com/iliakan/detect-node/\nexport function isNode(): boolean {\n  try {\n    return (\n      Object.prototype.toString.call(global.process) === '[object process]'\n    );\n  } catch (e) {\n    return false;\n  }\n}\n\n/**\n * Detect Browser Environment\n */\nexport function isBrowser(): boolean {\n  return typeof self === 'object' && self.self === self;\n}\n\n/**\n * Detect browser extensions (Chrome and Firefox at least).\n */\ninterface BrowserRuntime {\n  id?: unknown;\n}\ndeclare const chrome: { runtime?: BrowserRuntime };\ndeclare const browser: { runtime?: BrowserRuntime };\nexport function isBrowserExtension(): boolean {\n  const runtime =\n    typeof chrome === 'object'\n      ? chrome.runtime\n      : typeof browser === 'object'\n      ? browser.runtime\n      : undefined;\n  return typeof runtime === 'object' && runtime.id !== undefined;\n}\n\n/**\n * Detect React Native.\n *\n * @return true if ReactNative environment is detected.\n */\nexport function isReactNative(): boolean {\n  return (\n    typeof navigator === 'object' && navigator['product'] === 'ReactNative'\n  );\n}\n\n/** Detects Electron apps. */\nexport function isElectron(): boolean {\n  return getUA().indexOf('Electron/') >= 0;\n}\n\n/** Detects Internet Explorer. */\nexport function isIE(): boolean {\n  const ua = getUA();\n  return ua.indexOf('MSIE ') >= 0 || ua.indexOf('Trident/') >= 0;\n}\n\n/** Detects Universal Windows Platform apps. */\nexport function isUWP(): boolean {\n  return getUA().indexOf('MSAppHost/') >= 0;\n}\n\n/**\n * Detect whether the current SDK build is the Node version.\n *\n * @return true if it's the Node SDK build.\n */\nexport function isNodeSdk(): boolean {\n  return CONSTANTS.NODE_CLIENT === true || CONSTANTS.NODE_ADMIN === true;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n/**\n * @fileoverview Standardized Firebase Error.\n *\n * Usage:\n *\n *   // Typescript string literals for type-safe codes\n *   type Err =\n *     'unknown' |\n *     'object-not-found'\n *     ;\n *\n *   // Closure enum for type-safe error codes\n *   // at-enum {string}\n *   var Err = {\n *     UNKNOWN: 'unknown',\n *     OBJECT_NOT_FOUND: 'object-not-found',\n *   }\n *\n *   let errors: Map<Err, string> = {\n *     'generic-error': \"Unknown error\",\n *     'file-not-found': \"Could not find file: {$file}\",\n *   };\n *\n *   // Type-safe function - must pass a valid error code as param.\n *   let error = new ErrorFactory<Err>('service', 'Service', errors);\n *\n *   ...\n *   throw error.create(Err.GENERIC);\n *   ...\n *   throw error.create(Err.FILE_NOT_FOUND, {'file': fileName});\n *   ...\n *   // Service: Could not file file: foo.txt (service/file-not-found).\n *\n *   catch (e) {\n *     assert(e.message === \"Could not find file: foo.txt.\");\n *     if (e.code === 'service/file-not-found') {\n *       console.log(\"Could not read file: \" + e['file']);\n *     }\n *   }\n */\n\nexport type ErrorMap<ErrorCode extends string> = {\n  readonly [K in ErrorCode]: string;\n};\n\nconst ERROR_NAME = 'FirebaseError';\n\nexport interface StringLike {\n  toString(): string;\n}\n\nexport interface ErrorData {\n  [key: string]: StringLike | undefined;\n}\n\nexport interface FirebaseError extends Error, ErrorData {\n  // Unique code for error - format is service/error-code-string.\n  readonly code: string;\n\n  // Developer-friendly error message.\n  readonly message: string;\n\n  // Always 'FirebaseError'.\n  readonly name: typeof ERROR_NAME;\n\n  // Where available - stack backtrace in a string.\n  readonly stack?: string;\n}\n\n// Based on code from:\n// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error#Custom_Error_Types\nexport class FirebaseError extends Error {\n  readonly name = ERROR_NAME;\n\n  constructor(readonly code: string, message: string) {\n    super(message);\n\n    // Fix For ES5\n    // https://github.com/Microsoft/TypeScript-wiki/blob/master/Breaking-Changes.md#extending-built-ins-like-error-array-and-map-may-no-longer-work\n    Object.setPrototypeOf(this, FirebaseError.prototype);\n\n    // Maintains proper stack trace for where our error was thrown.\n    // Only available on V8.\n    if (Error.captureStackTrace) {\n      Error.captureStackTrace(this, ErrorFactory.prototype.create);\n    }\n  }\n}\n\nexport class ErrorFactory<\n  ErrorCode extends string,\n  ErrorParams extends { readonly [K in ErrorCode]?: ErrorData } = {}\n> {\n  constructor(\n    private readonly service: string,\n    private readonly serviceName: string,\n    private readonly errors: ErrorMap<ErrorCode>\n  ) {}\n\n  create<K extends ErrorCode>(\n    code: K,\n    ...data: K extends keyof ErrorParams ? [ErrorParams[K]] : []\n  ): FirebaseError {\n    const customData = (data[0] as ErrorData) || {};\n    const fullCode = `${this.service}/${code}`;\n    const template = this.errors[code];\n\n    const message = template ? replaceTemplate(template, customData) : 'Error';\n    // Service Name: Error message (service/code).\n    const fullMessage = `${this.serviceName}: ${message} (${fullCode}).`;\n\n    const error = new FirebaseError(fullCode, fullMessage);\n\n    // Keys with an underscore at the end of their name are not included in\n    // error.data for some reason.\n    // TODO: Replace with Object.entries when lib is updated to es2017.\n    for (const key of Object.keys(customData)) {\n      if (key.slice(-1) !== '_') {\n        if (key in error) {\n          console.warn(\n            `Overwriting FirebaseError base field \"${key}\" can cause unexpected behavior.`\n          );\n        }\n        error[key] = customData[key];\n      }\n    }\n\n    return error;\n  }\n}\n\nfunction replaceTemplate(template: string, data: ErrorData): string {\n  return template.replace(PATTERN, (_, key) => {\n    const value = data[key];\n    return value != null ? value.toString() : `<${key}?>`;\n  });\n}\n\nconst PATTERN = /\\{\\$([^}]+)}/g;\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\nimport {\n  InstantiationMode,\n  InstanceFactory,\n  ComponentType,\n  Dictionary,\n  Name\n} from './types';\n\n/**\n * Component for service name T, e.g. `auth`, `auth-internal`\n */\nexport class Component<T extends Name = Name> {\n  multipleInstances = false;\n  /**\n   * Properties to be added to the service namespace\n   */\n  serviceProps: Dictionary = {};\n\n  instantiationMode = InstantiationMode.LAZY;\n\n  /**\n   *\n   * @param name The public service name, e.g. app, auth, firestore, database\n   * @param instanceFactory Service factory responsible for creating the public interface\n   * @param type whether the service provided by the component is public or private\n   */\n  constructor(\n    readonly name: T,\n    readonly instanceFactory: InstanceFactory<T>,\n    readonly type: ComponentType\n  ) {}\n\n  setInstantiationMode(mode: InstantiationMode): this {\n    this.instantiationMode = mode;\n    return this;\n  }\n\n  setMultipleInstances(multipleInstances: boolean): this {\n    this.multipleInstances = multipleInstances;\n    return this;\n  }\n\n  setServiceProps(props: Dictionary): this {\n    this.serviceProps = props;\n    return this;\n  }\n}\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Bootstrap for the Google JS Library (Closure).\n *\n * In uncompiled mode base.js will attempt to load Closure's deps file, unless\n * the global <code>CLOSURE_NO_DEPS</code> is set to true.  This allows projects\n * to include their own deps file(s) from different locations.\n *\n * Avoid including base.js more than once. This is strictly discouraged and not\n * supported. goog.require(...) won't work properly in that case.\n *\n * @provideGoog\n */\n\n\n/**\n * @define {boolean} Overridden to true by the compiler.\n */\nvar COMPILED = false;\n\n\n/**\n * Base namespace for the Closure library.  Checks to see goog is already\n * defined in the current scope before assigning to prevent clobbering if\n * base.js is loaded more than once.\n *\n * @const\n */\nvar goog = goog || {};\n\n/**\n * Reference to the global object.\n * https://www.ecma-international.org/ecma-262/9.0/index.html#sec-global-object\n *\n * More info on this implementation here:\n * https://docs.google.com/document/d/1NAeW4Wk7I7FV0Y2tcUFvQdGMc89k2vdgSXInw8_nvCI/edit\n *\n * @const\n * @suppress {undefinedVars} self won't be referenced unless `this` is falsy.\n * @type {!Global}\n */\ngoog.global =\n    // Check `this` first for backwards compatibility.\n    // Valid unless running as an ES module or in a function wrapper called\n    //   without setting `this` properly.\n    // Note that base.js can't usefully be imported as an ES module, but it may\n    // be compiled into bundles that are loadable as ES modules.\n    this ||\n    // https://developer.mozilla.org/en-US/docs/Web/API/Window/self\n    // For in-page browser environments and workers.\n    self;\n\n\n/**\n * A hook for overriding the define values in uncompiled mode.\n *\n * In uncompiled mode, `CLOSURE_UNCOMPILED_DEFINES` may be defined before\n * loading base.js.  If a key is defined in `CLOSURE_UNCOMPILED_DEFINES`,\n * `goog.define` will use the value instead of the default value.  This\n * allows flags to be overwritten without compilation (this is normally\n * accomplished with the compiler's \"define\" flag).\n *\n * Example:\n * <pre>\n *   var CLOSURE_UNCOMPILED_DEFINES = {'goog.DEBUG': false};\n * </pre>\n *\n * @type {Object<string, (string|number|boolean)>|undefined}\n */\ngoog.global.CLOSURE_UNCOMPILED_DEFINES;\n\n\n/**\n * A hook for overriding the define values in uncompiled or compiled mode,\n * like CLOSURE_UNCOMPILED_DEFINES but effective in compiled code.  In\n * uncompiled code CLOSURE_UNCOMPILED_DEFINES takes precedence.\n *\n * Also unlike CLOSURE_UNCOMPILED_DEFINES the values must be number, boolean or\n * string literals or the compiler will emit an error.\n *\n * While any @define value may be set, only those set with goog.define will be\n * effective for uncompiled code.\n *\n * Example:\n * <pre>\n *   var CLOSURE_DEFINES = {'goog.DEBUG': false} ;\n * </pre>\n *\n * @type {Object<string, (string|number|boolean)>|undefined}\n */\ngoog.global.CLOSURE_DEFINES;\n\n\n/**\n * Builds an object structure for the provided namespace path, ensuring that\n * names that already exist are not overwritten. For example:\n * \"a.b.c\" -> a = {};a.b={};a.b.c={};\n * Used by goog.provide and goog.exportSymbol.\n * @param {string} name name of the object that this file defines.\n * @param {*=} opt_object the object to expose at the end of the path.\n * @param {Object=} opt_objectToExportTo The object to add the path to; default\n *     is `goog.global`.\n * @private\n */\ngoog.exportPath_ = function(name, opt_object, opt_objectToExportTo) {\n  var parts = name.split('.');\n  var cur = opt_objectToExportTo || goog.global;\n\n  // Internet Explorer exhibits strange behavior when throwing errors from\n  // methods externed in this manner.  See the testExportSymbolExceptions in\n  // base_test.html for an example.\n  if (!(parts[0] in cur) && typeof cur.execScript != 'undefined') {\n    cur.execScript('var ' + parts[0]);\n  }\n\n  for (var part; parts.length && (part = parts.shift());) {\n    if (!parts.length && opt_object !== undefined) {\n      // last part and we have an object; use it\n      cur[part] = opt_object;\n    } else if (cur[part] && cur[part] !== Object.prototype[part]) {\n      cur = cur[part];\n    } else {\n      cur = cur[part] = {};\n    }\n  }\n};\n\n\n/**\n * Defines a named value. In uncompiled mode, the value is retrieved from\n * CLOSURE_DEFINES or CLOSURE_UNCOMPILED_DEFINES if the object is defined and\n * has the property specified, and otherwise used the defined defaultValue.\n * When compiled the default can be overridden using the compiler options or the\n * value set in the CLOSURE_DEFINES object. Returns the defined value so that it\n * can be used safely in modules. Note that the value type MUST be either\n * boolean, number, or string.\n *\n * @param {string} name The distinguished name to provide.\n * @param {T} defaultValue\n * @return {T} The defined value.\n * @template T\n */\ngoog.define = function(name, defaultValue) {\n  var value = defaultValue;\n  if (!COMPILED) {\n    var uncompiledDefines = goog.global.CLOSURE_UNCOMPILED_DEFINES;\n    var defines = goog.global.CLOSURE_DEFINES;\n    if (uncompiledDefines &&\n        // Anti DOM-clobbering runtime check (b/37736576).\n        /** @type {?} */ (uncompiledDefines).nodeType === undefined &&\n        Object.prototype.hasOwnProperty.call(uncompiledDefines, name)) {\n      value = uncompiledDefines[name];\n    } else if (\n        defines &&\n        // Anti DOM-clobbering runtime check (b/37736576).\n        /** @type {?} */ (defines).nodeType === undefined &&\n        Object.prototype.hasOwnProperty.call(defines, name)) {\n      value = defines[name];\n    }\n  }\n  return value;\n};\n\n\n/**\n * @define {number} Integer year indicating the set of browser features that are\n * guaranteed to be present.  This is defined to include exactly features that\n * work correctly on all \"modern\" browsers that are stable on January 1 of the\n * specified year.  For example,\n * ```js\n * if (goog.FEATURESET_YEAR >= 2019) {\n *   // use APIs known to be available on all major stable browsers Jan 1, 2019\n * } else {\n *   // polyfill for older browsers\n * }\n * ```\n * This is intended to be the primary define for removing\n * unnecessary browser compatibility code (such as ponyfills and workarounds),\n * and should inform the default value for most other defines:\n * ```js\n * const ASSUME_NATIVE_PROMISE =\n *     goog.define('ASSUME_NATIVE_PROMISE', goog.FEATURESET_YEAR >= 2016);\n * ```\n *\n * The default assumption is that IE9 is the lowest supported browser, which was\n * first available Jan 1, 2012.\n *\n * TODO(user): Reference more thorough documentation when it's available.\n */\ngoog.FEATURESET_YEAR = goog.define('goog.FEATURESET_YEAR', 2012);\n\n\n/**\n * @define {boolean} DEBUG is provided as a convenience so that debugging code\n * that should not be included in a production. It can be easily stripped\n * by specifying --define goog.DEBUG=false to the Closure Compiler aka\n * JSCompiler. For example, most toString() methods should be declared inside an\n * \"if (goog.DEBUG)\" conditional because they are generally used for debugging\n * purposes and it is difficult for the JSCompiler to statically determine\n * whether they are used.\n */\ngoog.DEBUG = goog.define('goog.DEBUG', true);\n\n\n/**\n * @define {string} LOCALE defines the locale being used for compilation. It is\n * used to select locale specific data to be compiled in js binary. BUILD rule\n * can specify this value by \"--define goog.LOCALE=<locale_name>\" as a compiler\n * option.\n *\n * Take into account that the locale code format is important. You should use\n * the canonical Unicode format with hyphen as a delimiter. Language must be\n * lowercase, Language Script - Capitalized, Region - UPPERCASE.\n * There are few examples: pt-BR, en, en-US, sr-Latin-BO, zh-Hans-CN.\n *\n * See more info about locale codes here:\n * http://www.unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers\n *\n * For language codes you should use values defined by ISO 693-1. See it here\n * http://www.w3.org/WAI/ER/IG/ert/iso639.htm. There is only one exception from\n * this rule: the Hebrew language. For legacy reasons the old code (iw) should\n * be used instead of the new code (he).\n *\n */\ngoog.LOCALE = goog.define('goog.LOCALE', 'en');  // default to en\n\n\n/**\n * @define {boolean} Whether this code is running on trusted sites.\n *\n * On untrusted sites, several native functions can be defined or overridden by\n * external libraries like Prototype, Datejs, and JQuery and setting this flag\n * to false forces closure to use its own implementations when possible.\n *\n * If your JavaScript can be loaded by a third party site and you are wary about\n * relying on non-standard implementations, specify\n * \"--define goog.TRUSTED_SITE=false\" to the compiler.\n */\ngoog.TRUSTED_SITE = goog.define('goog.TRUSTED_SITE', true);\n\n\n/**\n * @define {boolean} Whether a project is expected to be running in strict mode.\n *\n * This define can be used to trigger alternate implementations compatible with\n * running in EcmaScript Strict mode or warn about unavailable functionality.\n * @see https://goo.gl/PudQ4y\n *\n */\ngoog.STRICT_MODE_COMPATIBLE = goog.define('goog.STRICT_MODE_COMPATIBLE', false);\n\n\n/**\n * @define {boolean} Whether code that calls {@link goog.setTestOnly} should\n *     be disallowed in the compilation unit.\n */\ngoog.DISALLOW_TEST_ONLY_CODE =\n    goog.define('goog.DISALLOW_TEST_ONLY_CODE', COMPILED && !goog.DEBUG);\n\n\n/**\n * @define {boolean} Whether to use a Chrome app CSP-compliant method for\n *     loading scripts via goog.require. @see appendScriptSrcNode_.\n */\ngoog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING =\n    goog.define('goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING', false);\n\n\n/**\n * Defines a namespace in Closure.\n *\n * A namespace may only be defined once in a codebase. It may be defined using\n * goog.provide() or goog.module().\n *\n * The presence of one or more goog.provide() calls in a file indicates\n * that the file defines the given objects/namespaces.\n * Provided symbols must not be null or undefined.\n *\n * In addition, goog.provide() creates the object stubs for a namespace\n * (for example, goog.provide(\"goog.foo.bar\") will create the object\n * goog.foo.bar if it does not already exist).\n *\n * Build tools also scan for provide/require/module statements\n * to discern dependencies, build dependency files (see deps.js), etc.\n *\n * @see goog.require\n * @see goog.module\n * @param {string} name Namespace provided by this file in the form\n *     \"goog.package.part\".\n */\ngoog.provide = function(name) {\n  if (goog.isInModuleLoader_()) {\n    throw new Error('goog.provide cannot be used within a module.');\n  }\n  if (!COMPILED) {\n    // Ensure that the same namespace isn't provided twice.\n    // A goog.module/goog.provide maps a goog.require to a specific file\n    if (goog.isProvided_(name)) {\n      throw new Error('Namespace \"' + name + '\" already declared.');\n    }\n  }\n\n  goog.constructNamespace_(name);\n};\n\n\n/**\n * @param {string} name Namespace provided by this file in the form\n *     \"goog.package.part\".\n * @param {Object=} opt_obj The object to embed in the namespace.\n * @private\n */\ngoog.constructNamespace_ = function(name, opt_obj) {\n  if (!COMPILED) {\n    delete goog.implicitNamespaces_[name];\n\n    var namespace = name;\n    while ((namespace = namespace.substring(0, namespace.lastIndexOf('.')))) {\n      if (goog.getObjectByName(namespace)) {\n        break;\n      }\n      goog.implicitNamespaces_[namespace] = true;\n    }\n  }\n\n  goog.exportPath_(name, opt_obj);\n};\n\n\n/**\n * Returns CSP nonce, if set for any script tag.\n * @param {?Window=} opt_window The window context used to retrieve the nonce.\n *     Defaults to global context.\n * @return {string} CSP nonce or empty string if no nonce is present.\n */\ngoog.getScriptNonce = function(opt_window) {\n  if (opt_window && opt_window != goog.global) {\n    return goog.getScriptNonce_(opt_window.document);\n  }\n  if (goog.cspNonce_ === null) {\n    goog.cspNonce_ = goog.getScriptNonce_(goog.global.document);\n  }\n  return goog.cspNonce_;\n};\n\n\n/**\n * According to the CSP3 spec a nonce must be a valid base64 string.\n * @see https://www.w3.org/TR/CSP3/#grammardef-base64-value\n * @private @const\n */\ngoog.NONCE_PATTERN_ = /^[\\w+/_-]+[=]{0,2}$/;\n\n\n/**\n * @private {?string}\n */\ngoog.cspNonce_ = null;\n\n\n/**\n * Returns CSP nonce, if set for any script tag.\n * @param {!Document} doc\n * @return {string} CSP nonce or empty string if no nonce is present.\n * @private\n */\ngoog.getScriptNonce_ = function(doc) {\n  var script = doc.querySelector && doc.querySelector('script[nonce]');\n  if (script) {\n    // Try to get the nonce from the IDL property first, because browsers that\n    // implement additional nonce protection features (currently only Chrome) to\n    // prevent nonce stealing via CSS do not expose the nonce via attributes.\n    // See https://github.com/whatwg/html/issues/2369\n    var nonce = script['nonce'] || script.getAttribute('nonce');\n    if (nonce && goog.NONCE_PATTERN_.test(nonce)) {\n      return nonce;\n    }\n  }\n  return '';\n};\n\n\n/**\n * Module identifier validation regexp.\n * Note: This is a conservative check, it is very possible to be more lenient,\n *   the primary exclusion here is \"/\" and \"\\\" and a leading \".\", these\n *   restrictions are intended to leave the door open for using goog.require\n *   with relative file paths rather than module identifiers.\n * @private\n */\ngoog.VALID_MODULE_RE_ = /^[a-zA-Z_$][a-zA-Z0-9._$]*$/;\n\n\n/**\n * Defines a module in Closure.\n *\n * Marks that this file must be loaded as a module and claims the namespace.\n *\n * A namespace may only be defined once in a codebase. It may be defined using\n * goog.provide() or goog.module().\n *\n * goog.module() has three requirements:\n * - goog.module may not be used in the same file as goog.provide.\n * - goog.module must be the first statement in the file.\n * - only one goog.module is allowed per file.\n *\n * When a goog.module annotated file is loaded, it is enclosed in\n * a strict function closure. This means that:\n * - any variables declared in a goog.module file are private to the file\n * (not global), though the compiler is expected to inline the module.\n * - The code must obey all the rules of \"strict\" JavaScript.\n * - the file will be marked as \"use strict\"\n *\n * NOTE: unlike goog.provide, goog.module does not declare any symbols by\n * itself. If declared symbols are desired, use\n * goog.module.declareLegacyNamespace().\n *\n *\n * See the public goog.module proposal: http://goo.gl/Va1hin\n *\n * @param {string} name Namespace provided by this file in the form\n *     \"goog.package.part\", is expected but not required.\n * @return {void}\n */\ngoog.module = function(name) {\n  if (typeof name !== 'string' || !name ||\n      name.search(goog.VALID_MODULE_RE_) == -1) {\n    throw new Error('Invalid module identifier');\n  }\n  if (!goog.isInGoogModuleLoader_()) {\n    throw new Error(\n        'Module ' + name + ' has been loaded incorrectly. Note, ' +\n        'modules cannot be loaded as normal scripts. They require some kind of ' +\n        'pre-processing step. You\\'re likely trying to load a module via a ' +\n        'script tag or as a part of a concatenated bundle without rewriting the ' +\n        'module. For more info see: ' +\n        'https://github.com/google/closure-library/wiki/goog.module:-an-ES6-module-like-alternative-to-goog.provide.');\n  }\n  if (goog.moduleLoaderState_.moduleName) {\n    throw new Error('goog.module may only be called once per module.');\n  }\n\n  // Store the module name for the loader.\n  goog.moduleLoaderState_.moduleName = name;\n  if (!COMPILED) {\n    // Ensure that the same namespace isn't provided twice.\n    // A goog.module/goog.provide maps a goog.require to a specific file\n    if (goog.isProvided_(name)) {\n      throw new Error('Namespace \"' + name + '\" already declared.');\n    }\n    delete goog.implicitNamespaces_[name];\n  }\n};\n\n\n/**\n * @param {string} name The module identifier.\n * @return {?} The module exports for an already loaded module or null.\n *\n * Note: This is not an alternative to goog.require, it does not\n * indicate a hard dependency, instead it is used to indicate\n * an optional dependency or to access the exports of a module\n * that has already been loaded.\n * @suppress {missingProvide}\n */\ngoog.module.get = function(name) {\n  return goog.module.getInternal_(name);\n};\n\n\n/**\n * @param {string} name The module identifier.\n * @return {?} The module exports for an already loaded module or null.\n * @private\n */\ngoog.module.getInternal_ = function(name) {\n  if (!COMPILED) {\n    if (name in goog.loadedModules_) {\n      return goog.loadedModules_[name].exports;\n    } else if (!goog.implicitNamespaces_[name]) {\n      var ns = goog.getObjectByName(name);\n      return ns != null ? ns : null;\n    }\n  }\n  return null;\n};\n\n\n/**\n * Types of modules the debug loader can load.\n * @enum {string}\n */\ngoog.ModuleType = {\n  ES6: 'es6',\n  GOOG: 'goog'\n};\n\n\n/**\n * @private {?{\n *   moduleName: (string|undefined),\n *   declareLegacyNamespace:boolean,\n *   type: ?goog.ModuleType\n * }}\n */\ngoog.moduleLoaderState_ = null;\n\n\n/**\n * @private\n * @return {boolean} Whether a goog.module or an es6 module is currently being\n *     initialized.\n */\ngoog.isInModuleLoader_ = function() {\n  return goog.isInGoogModuleLoader_() || goog.isInEs6ModuleLoader_();\n};\n\n\n/**\n * @private\n * @return {boolean} Whether a goog.module is currently being initialized.\n */\ngoog.isInGoogModuleLoader_ = function() {\n  return !!goog.moduleLoaderState_ &&\n      goog.moduleLoaderState_.type == goog.ModuleType.GOOG;\n};\n\n\n/**\n * @private\n * @return {boolean} Whether an es6 module is currently being initialized.\n */\ngoog.isInEs6ModuleLoader_ = function() {\n  var inLoader = !!goog.moduleLoaderState_ &&\n      goog.moduleLoaderState_.type == goog.ModuleType.ES6;\n\n  if (inLoader) {\n    return true;\n  }\n\n  var jscomp = goog.global['$jscomp'];\n\n  if (jscomp) {\n    // jscomp may not have getCurrentModulePath if this is a compiled bundle\n    // that has some of the runtime, but not all of it. This can happen if\n    // optimizations are turned on so the unused runtime is removed but renaming\n    // and Closure pass are off (so $jscomp is still named $jscomp and the\n    // goog.provide/require calls still exist).\n    if (typeof jscomp.getCurrentModulePath != 'function') {\n      return false;\n    }\n\n    // Bundled ES6 module.\n    return !!jscomp.getCurrentModulePath();\n  }\n\n  return false;\n};\n\n\n/**\n * Provide the module's exports as a globally accessible object under the\n * module's declared name.  This is intended to ease migration to goog.module\n * for files that have existing usages.\n * @suppress {missingProvide}\n */\ngoog.module.declareLegacyNamespace = function() {\n  if (!COMPILED && !goog.isInGoogModuleLoader_()) {\n    throw new Error(\n        'goog.module.declareLegacyNamespace must be called from ' +\n        'within a goog.module');\n  }\n  if (!COMPILED && !goog.moduleLoaderState_.moduleName) {\n    throw new Error(\n        'goog.module must be called prior to ' +\n        'goog.module.declareLegacyNamespace.');\n  }\n  goog.moduleLoaderState_.declareLegacyNamespace = true;\n};\n\n\n/**\n * Associates an ES6 module with a Closure module ID so that is available via\n * goog.require. The associated ID  acts like a goog.module ID - it does not\n * create any global names, it is merely available via goog.require /\n * goog.module.get / goog.forwardDeclare / goog.requireType. goog.require and\n * goog.module.get will return the entire module as if it was import *'d. This\n * allows Closure files to reference ES6 modules for the sake of migration.\n *\n * @param {string} namespace\n * @suppress {missingProvide}\n */\ngoog.declareModuleId = function(namespace) {\n  if (!COMPILED) {\n    if (!goog.isInEs6ModuleLoader_()) {\n      throw new Error(\n          'goog.declareModuleId may only be called from ' +\n          'within an ES6 module');\n    }\n    if (goog.moduleLoaderState_ && goog.moduleLoaderState_.moduleName) {\n      throw new Error(\n          'goog.declareModuleId may only be called once per module.');\n    }\n    if (namespace in goog.loadedModules_) {\n      throw new Error(\n          'Module with namespace \"' + namespace + '\" already exists.');\n    }\n  }\n  if (goog.moduleLoaderState_) {\n    // Not bundled - debug loading.\n    goog.moduleLoaderState_.moduleName = namespace;\n  } else {\n    // Bundled - not debug loading, no module loader state.\n    var jscomp = goog.global['$jscomp'];\n    if (!jscomp || typeof jscomp.getCurrentModulePath != 'function') {\n      throw new Error(\n          'Module with namespace \"' + namespace +\n          '\" has been loaded incorrectly.');\n    }\n    var exports = jscomp.require(jscomp.getCurrentModulePath());\n    goog.loadedModules_[namespace] = {\n      exports: exports,\n      type: goog.ModuleType.ES6,\n      moduleId: namespace\n    };\n  }\n};\n\n\n/**\n * Marks that the current file should only be used for testing, and never for\n * live code in production.\n *\n * In the case of unit tests, the message may optionally be an exact namespace\n * for the test (e.g. 'goog.stringTest'). The linter will then ignore the extra\n * provide (if not explicitly defined in the code).\n *\n * @param {string=} opt_message Optional message to add to the error that's\n *     raised when used in production code.\n */\ngoog.setTestOnly = function(opt_message) {\n  if (goog.DISALLOW_TEST_ONLY_CODE) {\n    opt_message = opt_message || '';\n    throw new Error(\n        'Importing test-only code into non-debug environment' +\n        (opt_message ? ': ' + opt_message : '.'));\n  }\n};\n\n\n/**\n * Forward declares a symbol. This is an indication to the compiler that the\n * symbol may be used in the source yet is not required and may not be provided\n * in compilation.\n *\n * The most common usage of forward declaration is code that takes a type as a\n * function parameter but does not need to require it. By forward declaring\n * instead of requiring, no hard dependency is made, and (if not required\n * elsewhere) the namespace may never be required and thus, not be pulled\n * into the JavaScript binary. If it is required elsewhere, it will be type\n * checked as normal.\n *\n * Before using goog.forwardDeclare, please read the documentation at\n * https://github.com/google/closure-compiler/wiki/Bad-Type-Annotation to\n * understand the options and tradeoffs when working with forward declarations.\n *\n * @param {string} name The namespace to forward declare in the form of\n *     \"goog.package.part\".\n * @deprecated See go/noforwarddeclaration, Use `goog.requireType` instead.\n */\ngoog.forwardDeclare = function(name) {};\n\n\n/**\n * Forward declare type information. Used to assign types to goog.global\n * referenced object that would otherwise result in unknown type references\n * and thus block property disambiguation.\n */\ngoog.forwardDeclare('Document');\ngoog.forwardDeclare('HTMLScriptElement');\ngoog.forwardDeclare('XMLHttpRequest');\n\n\nif (!COMPILED) {\n  /**\n   * Check if the given name has been goog.provided. This will return false for\n   * names that are available only as implicit namespaces.\n   * @param {string} name name of the object to look for.\n   * @return {boolean} Whether the name has been provided.\n   * @private\n   */\n  goog.isProvided_ = function(name) {\n    return (name in goog.loadedModules_) ||\n        (!goog.implicitNamespaces_[name] && goog.getObjectByName(name) != null);\n  };\n\n  /**\n   * Namespaces implicitly defined by goog.provide. For example,\n   * goog.provide('goog.events.Event') implicitly declares that 'goog' and\n   * 'goog.events' must be namespaces.\n   *\n   * @type {!Object<string, (boolean|undefined)>}\n   * @private\n   */\n  goog.implicitNamespaces_ = {'goog.module': true};\n\n  // NOTE: We add goog.module as an implicit namespace as goog.module is defined\n  // here and because the existing module package has not been moved yet out of\n  // the goog.module namespace. This satisifies both the debug loader and\n  // ahead-of-time dependency management.\n}\n\n\n/**\n * Returns an object based on its fully qualified external name.  The object\n * is not found if null or undefined.  If you are using a compilation pass that\n * renames property names beware that using this function will not find renamed\n * properties.\n *\n * @param {string} name The fully qualified name.\n * @param {Object=} opt_obj The object within which to look; default is\n *     |goog.global|.\n * @return {?} The value (object or primitive) or, if not found, null.\n */\ngoog.getObjectByName = function(name, opt_obj) {\n  var parts = name.split('.');\n  var cur = opt_obj || goog.global;\n  for (var i = 0; i < parts.length; i++) {\n    cur = cur[parts[i]];\n    if (cur == null) {\n      return null;\n    }\n  }\n  return cur;\n};\n\n\n/**\n * Globalizes a whole namespace, such as goog or goog.lang.\n *\n * @param {!Object} obj The namespace to globalize.\n * @param {Object=} opt_global The object to add the properties to.\n * @deprecated Properties may be explicitly exported to the global scope, but\n *     this should no longer be done in bulk.\n */\ngoog.globalize = function(obj, opt_global) {\n  var global = opt_global || goog.global;\n  for (var x in obj) {\n    global[x] = obj[x];\n  }\n};\n\n\n/**\n * Adds a dependency from a file to the files it requires.\n * @param {string} relPath The path to the js file.\n * @param {!Array<string>} provides An array of strings with\n *     the names of the objects this file provides.\n * @param {!Array<string>} requires An array of strings with\n *     the names of the objects this file requires.\n * @param {boolean|!Object<string>=} opt_loadFlags Parameters indicating\n *     how the file must be loaded.  The boolean 'true' is equivalent\n *     to {'module': 'goog'} for backwards-compatibility.  Valid properties\n *     and values include {'module': 'goog'} and {'lang': 'es6'}.\n */\ngoog.addDependency = function(relPath, provides, requires, opt_loadFlags) {\n  if (!COMPILED && goog.DEPENDENCIES_ENABLED) {\n    goog.debugLoader_.addDependency(relPath, provides, requires, opt_loadFlags);\n  }\n};\n\n\n// NOTE(nnaze): The debug DOM loader was included in base.js as an original way\n// to do \"debug-mode\" development.  The dependency system can sometimes be\n// confusing, as can the debug DOM loader's asynchronous nature.\n//\n// With the DOM loader, a call to goog.require() is not blocking -- the script\n// will not load until some point after the current script.  If a namespace is\n// needed at runtime, it needs to be defined in a previous script, or loaded via\n// require() with its registered dependencies.\n//\n// User-defined namespaces may need their own deps file. For a reference on\n// creating a deps file, see:\n// Externally: https://developers.google.com/closure/library/docs/depswriter\n//\n// Because of legacy clients, the DOM loader can't be easily removed from\n// base.js.  Work was done to make it disableable or replaceable for\n// different environments (DOM-less JavaScript interpreters like Rhino or V8,\n// for example). See bootstrap/ for more information.\n\n\n/**\n * @define {boolean} Whether to enable the debug loader.\n *\n * If enabled, a call to goog.require() will attempt to load the namespace by\n * appending a script tag to the DOM (if the namespace has been registered).\n *\n * If disabled, goog.require() will simply assert that the namespace has been\n * provided (and depend on the fact that some outside tool correctly ordered\n * the script).\n */\ngoog.ENABLE_DEBUG_LOADER = goog.define('goog.ENABLE_DEBUG_LOADER', true);\n\n\n/**\n * @param {string} msg\n * @private\n */\ngoog.logToConsole_ = function(msg) {\n  if (goog.global.console) {\n    goog.global.console['error'](msg);\n  }\n};\n\n\n/**\n * Implements a system for the dynamic resolution of dependencies that works in\n * parallel with the BUILD system.\n *\n * Note that all calls to goog.require will be stripped by the compiler.\n *\n * @see goog.provide\n * @param {string} namespace Namespace (as was given in goog.provide,\n *     goog.module, or goog.declareModuleId) in the form\n *     \"goog.package.part\".\n * @return {?} If called within a goog.module or ES6 module file, the associated\n *     namespace or module otherwise null.\n */\ngoog.require = function(namespace) {\n  if (!COMPILED) {\n    // Might need to lazy load on old IE.\n    if (goog.ENABLE_DEBUG_LOADER) {\n      goog.debugLoader_.requested(namespace);\n    }\n\n    // If the object already exists we do not need to do anything.\n    if (goog.isProvided_(namespace)) {\n      if (goog.isInModuleLoader_()) {\n        return goog.module.getInternal_(namespace);\n      }\n    } else if (goog.ENABLE_DEBUG_LOADER) {\n      var moduleLoaderState = goog.moduleLoaderState_;\n      goog.moduleLoaderState_ = null;\n      try {\n        goog.debugLoader_.load_(namespace);\n      } finally {\n        goog.moduleLoaderState_ = moduleLoaderState;\n      }\n    }\n\n    return null;\n  }\n};\n\n\n/**\n * Requires a symbol for its type information. This is an indication to the\n * compiler that the symbol may appear in type annotations, yet it is not\n * referenced at runtime.\n *\n * When called within a goog.module or ES6 module file, the return value may be\n * assigned to or destructured into a variable, but it may not be otherwise used\n * in code outside of a type annotation.\n *\n * Note that all calls to goog.requireType will be stripped by the compiler.\n *\n * @param {string} namespace Namespace (as was given in goog.provide,\n *     goog.module, or goog.declareModuleId) in the form\n *     \"goog.package.part\".\n * @return {?}\n */\ngoog.requireType = function(namespace) {\n  // Return an empty object so that single-level destructuring of the return\n  // value doesn't crash at runtime when using the debug loader. Multi-level\n  // destructuring isn't supported.\n  return {};\n};\n\n\n/**\n * Path for included scripts.\n * @type {string}\n */\ngoog.basePath = '';\n\n\n/**\n * A hook for overriding the base path.\n * @type {string|undefined}\n */\ngoog.global.CLOSURE_BASE_PATH;\n\n\n/**\n * Whether to attempt to load Closure's deps file. By default, when uncompiled,\n * deps files will attempt to be loaded.\n * @type {boolean|undefined}\n */\ngoog.global.CLOSURE_NO_DEPS;\n\n\n/**\n * A function to import a single script. This is meant to be overridden when\n * Closure is being run in non-HTML contexts, such as web workers. It's defined\n * in the global scope so that it can be set before base.js is loaded, which\n * allows deps.js to be imported properly.\n *\n * The first parameter the script source, which is a relative URI. The second,\n * optional parameter is the script contents, in the event the script needed\n * transformation. It should return true if the script was imported, false\n * otherwise.\n * @type {(function(string, string=): boolean)|undefined}\n */\ngoog.global.CLOSURE_IMPORT_SCRIPT;\n\n\n/**\n * Null function used for default values of callbacks, etc.\n * @return {void} Nothing.\n */\ngoog.nullFunction = function() {};\n\n\n/**\n * When defining a class Foo with an abstract method bar(), you can do:\n * Foo.prototype.bar = goog.abstractMethod\n *\n * Now if a subclass of Foo fails to override bar(), an error will be thrown\n * when bar() is invoked.\n *\n * @type {!Function}\n * @throws {Error} when invoked to indicate the method should be overridden.\n * @deprecated Use \"@abstract\" annotation instead of goog.abstractMethod in new\n *     code. See\n *     https://github.com/google/closure-compiler/wiki/@abstract-classes-and-methods\n */\ngoog.abstractMethod = function() {\n  throw new Error('unimplemented abstract method');\n};\n\n\n/**\n * Adds a `getInstance` static method that always returns the same\n * instance object.\n * @param {!Function} ctor The constructor for the class to add the static\n *     method to.\n * @suppress {missingProperties} 'instance_' isn't a property on 'Function'\n *     but we don't have a better type to use here.\n */\ngoog.addSingletonGetter = function(ctor) {\n  // instance_ is immediately set to prevent issues with sealed constructors\n  // such as are encountered when a constructor is returned as the export object\n  // of a goog.module in unoptimized code.\n  // Delcare type to avoid conformance violations that ctor.instance_ is unknown\n  /** @type {undefined|!Object} @suppress {underscore} */\n  ctor.instance_ = undefined;\n  ctor.getInstance = function() {\n    if (ctor.instance_) {\n      return ctor.instance_;\n    }\n    if (goog.DEBUG) {\n      // NOTE: JSCompiler can't optimize away Array#push.\n      goog.instantiatedSingletons_[goog.instantiatedSingletons_.length] = ctor;\n    }\n    // Cast to avoid conformance violations that ctor.instance_ is unknown\n    return /** @type {!Object|undefined} */ (ctor.instance_) = new ctor;\n  };\n};\n\n\n/**\n * All singleton classes that have been instantiated, for testing. Don't read\n * it directly, use the `goog.testing.singleton` module. The compiler\n * removes this variable if unused.\n * @type {!Array<!Function>}\n * @private\n */\ngoog.instantiatedSingletons_ = [];\n\n\n/**\n * @define {boolean} Whether to load goog.modules using `eval` when using\n * the debug loader.  This provides a better debugging experience as the\n * source is unmodified and can be edited using Chrome Workspaces or similar.\n * However in some environments the use of `eval` is banned\n * so we provide an alternative.\n */\ngoog.LOAD_MODULE_USING_EVAL = goog.define('goog.LOAD_MODULE_USING_EVAL', true);\n\n\n/**\n * @define {boolean} Whether the exports of goog.modules should be sealed when\n * possible.\n */\ngoog.SEAL_MODULE_EXPORTS = goog.define('goog.SEAL_MODULE_EXPORTS', goog.DEBUG);\n\n\n/**\n * The registry of initialized modules:\n * The module identifier or path to module exports map.\n * @private @const {!Object<string, {exports:?,type:string,moduleId:string}>}\n */\ngoog.loadedModules_ = {};\n\n\n/**\n * True if the debug loader enabled and used.\n * @const {boolean}\n */\ngoog.DEPENDENCIES_ENABLED = !COMPILED && goog.ENABLE_DEBUG_LOADER;\n\n\n/**\n * @define {string} How to decide whether to transpile.  Valid values\n * are 'always', 'never', and 'detect'.  The default ('detect') is to\n * use feature detection to determine which language levels need\n * transpilation.\n */\n// NOTE(sdh): we could expand this to accept a language level to bypass\n// detection: e.g. goog.TRANSPILE == 'es5' would transpile ES6 files but\n// would leave ES3 and ES5 files alone.\ngoog.TRANSPILE = goog.define('goog.TRANSPILE', 'detect');\n\n/**\n * @define {boolean} If true assume that ES modules have already been\n * transpiled by the jscompiler (in the same way that transpile.js would\n * transpile them - to jscomp modules). Useful only for servers that wish to use\n * the debug loader and transpile server side. Thus this is only respected if\n * goog.TRANSPILE is \"never\".\n */\ngoog.ASSUME_ES_MODULES_TRANSPILED =\n    goog.define('goog.ASSUME_ES_MODULES_TRANSPILED', false);\n\n\n/**\n * @define {string} If a file needs to be transpiled what the output language\n * should be. By default this is the highest language level this file detects\n * the current environment supports. Generally this flag should not be set, but\n * it could be useful to override. Example: If the current environment supports\n * ES6 then by default ES7+ files will be transpiled to ES6, unless this is\n * overridden.\n *\n * Valid values include: es3, es5, es6, es7, and es8. Anything not recognized\n * is treated as es3.\n *\n * Note that setting this value does not force transpilation. Just if\n * transpilation occurs this will be the output. So this is most useful when\n * goog.TRANSPILE is set to 'always' and then forcing the language level to be\n * something lower than what the environment detects.\n */\ngoog.TRANSPILE_TO_LANGUAGE = goog.define('goog.TRANSPILE_TO_LANGUAGE', '');\n\n\n/**\n * @define {string} Path to the transpiler.  Executing the script at this\n * path (relative to base.js) should define a function $jscomp.transpile.\n */\ngoog.TRANSPILER = goog.define('goog.TRANSPILER', 'transpile.js');\n\n\n/**\n * @package {?boolean}\n * Visible for testing.\n */\ngoog.hasBadLetScoping = null;\n\n\n/**\n * @return {boolean}\n * @package Visible for testing.\n */\ngoog.useSafari10Workaround = function() {\n  if (goog.hasBadLetScoping == null) {\n    var hasBadLetScoping;\n    try {\n      hasBadLetScoping = !eval(\n          '\"use strict\";' +\n          'let x = 1; function f() { return typeof x; };' +\n          'f() == \"number\";');\n    } catch (e) {\n      // Assume that ES6 syntax isn't supported.\n      hasBadLetScoping = false;\n    }\n    goog.hasBadLetScoping = hasBadLetScoping;\n  }\n  return goog.hasBadLetScoping;\n};\n\n\n/**\n * @param {string} moduleDef\n * @return {string}\n * @package Visible for testing.\n */\ngoog.workaroundSafari10EvalBug = function(moduleDef) {\n  return '(function(){' + moduleDef +\n      '\\n' +  // Terminate any trailing single line comment.\n      ';' +   // Terminate any trailing expression.\n      '})();\\n';\n};\n\n\n/**\n * @param {function(?):?|string} moduleDef The module definition.\n */\ngoog.loadModule = function(moduleDef) {\n  // NOTE: we allow function definitions to be either in the from\n  // of a string to eval (which keeps the original source intact) or\n  // in a eval forbidden environment (CSP) we allow a function definition\n  // which in its body must call `goog.module`, and return the exports\n  // of the module.\n  var previousState = goog.moduleLoaderState_;\n  try {\n    goog.moduleLoaderState_ = {\n      moduleName: '',\n      declareLegacyNamespace: false,\n      type: goog.ModuleType.GOOG\n    };\n    var exports;\n    if (goog.isFunction(moduleDef)) {\n      exports = moduleDef.call(undefined, {});\n    } else if (typeof moduleDef === 'string') {\n      if (goog.useSafari10Workaround()) {\n        moduleDef = goog.workaroundSafari10EvalBug(moduleDef);\n      }\n\n      exports = goog.loadModuleFromSource_.call(undefined, moduleDef);\n    } else {\n      throw new Error('Invalid module definition');\n    }\n\n    var moduleName = goog.moduleLoaderState_.moduleName;\n    if (typeof moduleName === 'string' && moduleName) {\n      // Don't seal legacy namespaces as they may be used as a parent of\n      // another namespace\n      if (goog.moduleLoaderState_.declareLegacyNamespace) {\n        goog.constructNamespace_(moduleName, exports);\n      } else if (\n          goog.SEAL_MODULE_EXPORTS && Object.seal &&\n          typeof exports == 'object' && exports != null) {\n        Object.seal(exports);\n      }\n\n      var data = {\n        exports: exports,\n        type: goog.ModuleType.GOOG,\n        moduleId: goog.moduleLoaderState_.moduleName\n      };\n      goog.loadedModules_[moduleName] = data;\n    } else {\n      throw new Error('Invalid module name \\\"' + moduleName + '\\\"');\n    }\n  } finally {\n    goog.moduleLoaderState_ = previousState;\n  }\n};\n\n\n/**\n * @private @const\n */\ngoog.loadModuleFromSource_ = /** @type {function(string):?} */ (function() {\n  // NOTE: we avoid declaring parameters or local variables here to avoid\n  // masking globals or leaking values into the module definition.\n  'use strict';\n  var exports = {};\n  eval(arguments[0]);\n  return exports;\n});\n\n\n/**\n * Normalize a file path by removing redundant \"..\" and extraneous \".\" file\n * path components.\n * @param {string} path\n * @return {string}\n * @private\n */\ngoog.normalizePath_ = function(path) {\n  var components = path.split('/');\n  var i = 0;\n  while (i < components.length) {\n    if (components[i] == '.') {\n      components.splice(i, 1);\n    } else if (\n        i && components[i] == '..' && components[i - 1] &&\n        components[i - 1] != '..') {\n      components.splice(--i, 2);\n    } else {\n      i++;\n    }\n  }\n  return components.join('/');\n};\n\n\n/**\n * Provides a hook for loading a file when using Closure's goog.require() API\n * with goog.modules.  In particular this hook is provided to support Node.js.\n *\n * @type {(function(string):string)|undefined}\n */\ngoog.global.CLOSURE_LOAD_FILE_SYNC;\n\n\n/**\n * Loads file by synchronous XHR. Should not be used in production environments.\n * @param {string} src Source URL.\n * @return {?string} File contents, or null if load failed.\n * @private\n */\ngoog.loadFileSync_ = function(src) {\n  if (goog.global.CLOSURE_LOAD_FILE_SYNC) {\n    return goog.global.CLOSURE_LOAD_FILE_SYNC(src);\n  } else {\n    try {\n      /** @type {XMLHttpRequest} */\n      var xhr = new goog.global['XMLHttpRequest']();\n      xhr.open('get', src, false);\n      xhr.send();\n      // NOTE: Successful http: requests have a status of 200, but successful\n      // file: requests may have a status of zero.  Any other status, or a\n      // thrown exception (particularly in case of file: requests) indicates\n      // some sort of error, which we treat as a missing or unavailable file.\n      return xhr.status == 0 || xhr.status == 200 ? xhr.responseText : null;\n    } catch (err) {\n      // No need to rethrow or log, since errors should show up on their own.\n      return null;\n    }\n  }\n};\n\n\n/**\n * Lazily retrieves the transpiler and applies it to the source.\n * @param {string} code JS code.\n * @param {string} path Path to the code.\n * @param {string} target Language level output.\n * @return {string} The transpiled code.\n * @private\n */\ngoog.transpile_ = function(code, path, target) {\n  var jscomp = goog.global['$jscomp'];\n  if (!jscomp) {\n    goog.global['$jscomp'] = jscomp = {};\n  }\n  var transpile = jscomp.transpile;\n  if (!transpile) {\n    var transpilerPath = goog.basePath + goog.TRANSPILER;\n    var transpilerCode = goog.loadFileSync_(transpilerPath);\n    if (transpilerCode) {\n      // This must be executed synchronously, since by the time we know we\n      // need it, we're about to load and write the ES6 code synchronously,\n      // so a normal script-tag load will be too slow. Wrapped in a function\n      // so that code is eval'd in the global scope.\n      (function() {\n        (0, eval)(transpilerCode + '\\n//# sourceURL=' + transpilerPath);\n      }).call(goog.global);\n      // Even though the transpiler is optional, if $gwtExport is found, it's\n      // a sign the transpiler was loaded and the $jscomp.transpile *should*\n      // be there.\n      if (goog.global['$gwtExport'] && goog.global['$gwtExport']['$jscomp'] &&\n          !goog.global['$gwtExport']['$jscomp']['transpile']) {\n        throw new Error(\n            'The transpiler did not properly export the \"transpile\" ' +\n            'method. $gwtExport: ' + JSON.stringify(goog.global['$gwtExport']));\n      }\n      // transpile.js only exports a single $jscomp function, transpile. We\n      // grab just that and add it to the existing definition of $jscomp which\n      // contains the polyfills.\n      goog.global['$jscomp'].transpile =\n          goog.global['$gwtExport']['$jscomp']['transpile'];\n      jscomp = goog.global['$jscomp'];\n      transpile = jscomp.transpile;\n    }\n  }\n  if (!transpile) {\n    // The transpiler is an optional component.  If it's not available then\n    // replace it with a pass-through function that simply logs.\n    var suffix = ' requires transpilation but no transpiler was found.';\n    transpile = jscomp.transpile = function(code, path) {\n      // TODO(sdh): figure out some way to get this error to show up\n      // in test results, noting that the failure may occur in many\n      // different ways, including in loadModule() before the test\n      // runner even comes up.\n      goog.logToConsole_(path + suffix);\n      return code;\n    };\n  }\n  // Note: any transpilation errors/warnings will be logged to the console.\n  return transpile(code, path, target);\n};\n\n//==============================================================================\n// Language Enhancements\n//==============================================================================\n\n\n/**\n * This is a \"fixed\" version of the typeof operator.  It differs from the typeof\n * operator in such a way that null returns 'null' and arrays return 'array'.\n * @param {?} value The value to get the type of.\n * @return {string} The name of the type.\n */\ngoog.typeOf = function(value) {\n  var s = typeof value;\n  if (s == 'object') {\n    if (value) {\n      // Check these first, so we can avoid calling Object.prototype.toString if\n      // possible.\n      //\n      // IE9 and below improperly marshals typeof across execution contexts, but\n      // a cross-context object will still return false for \"instanceof Object\".\n      if (value instanceof Array) {\n        return 'array';\n      } else if (value instanceof Object) {\n        return s;\n      }\n\n      // HACK: In order to use an Object prototype method on the arbitrary\n      //   value, the compiler requires the value be cast to type Object,\n      //   even though the ECMA spec explicitly allows it.\n      var className = Object.prototype.toString.call(\n          /** @type {!Object} */ (value));\n      // In Firefox 3.6, attempting to access iframe window objects' length\n      // property throws an NS_ERROR_FAILURE, so we need to special-case it\n      // here.\n      if (className == '[object Window]') {\n        return 'object';\n      }\n\n      // We cannot always use constructor == Array or instanceof Array because\n      // different frames have different Array objects. In IE6, if the iframe\n      // where the array was created is destroyed, the array loses its\n      // prototype. Then dereferencing val.splice here throws an exception, so\n      // we can't use goog.isFunction. Calling typeof directly returns 'unknown'\n      // so that will work. In this case, this function will return false and\n      // most array functions will still work because the array is still\n      // array-like (supports length and []) even though it has lost its\n      // prototype.\n      // Mark Miller noticed that Object.prototype.toString\n      // allows access to the unforgeable [[Class]] property.\n      //  15.2.4.2 Object.prototype.toString ( )\n      //  When the toString method is called, the following steps are taken:\n      //      1. Get the [[Class]] property of this object.\n      //      2. Compute a string value by concatenating the three strings\n      //         \"[object \", Result(1), and \"]\".\n      //      3. Return Result(2).\n      // and this behavior survives the destruction of the execution context.\n      if ((className == '[object Array]' ||\n           // In IE all non value types are wrapped as objects across window\n           // boundaries (not iframe though) so we have to do object detection\n           // for this edge case.\n           typeof value.length == 'number' &&\n               typeof value.splice != 'undefined' &&\n               typeof value.propertyIsEnumerable != 'undefined' &&\n               !value.propertyIsEnumerable('splice')\n\n               )) {\n        return 'array';\n      }\n      // HACK: There is still an array case that fails.\n      //     function ArrayImpostor() {}\n      //     ArrayImpostor.prototype = [];\n      //     var impostor = new ArrayImpostor;\n      // this can be fixed by getting rid of the fast path\n      // (value instanceof Array) and solely relying on\n      // (value && Object.prototype.toString.vall(value) === '[object Array]')\n      // but that would require many more function calls and is not warranted\n      // unless closure code is receiving objects from untrusted sources.\n\n      // IE in cross-window calls does not correctly marshal the function type\n      // (it appears just as an object) so we cannot use just typeof val ==\n      // 'function'. However, if the object has a call property, it is a\n      // function.\n      if ((className == '[object Function]' ||\n           typeof value.call != 'undefined' &&\n               typeof value.propertyIsEnumerable != 'undefined' &&\n               !value.propertyIsEnumerable('call'))) {\n        return 'function';\n      }\n\n    } else {\n      return 'null';\n    }\n\n  } else if (s == 'function' && typeof value.call == 'undefined') {\n    // In Safari typeof nodeList returns 'function', and on Firefox typeof\n    // behaves similarly for HTML{Applet,Embed,Object}, Elements and RegExps. We\n    // would like to return object for those and we can detect an invalid\n    // function by making sure that the function object has a call method.\n    return 'object';\n  }\n  return s;\n};\n\n\n/**\n * Returns true if the specified value is an array.\n * @param {?} val Variable to test.\n * @return {boolean} Whether variable is an array.\n * @deprecated Use Array.isArray instead.\n */\ngoog.isArray = function(val) {\n  return goog.typeOf(val) == 'array';\n};\n\n\n/**\n * Returns true if the object looks like an array. To qualify as array like\n * the value needs to be either a NodeList or an object with a Number length\n * property. Note that for this function neither strings nor functions are\n * considered \"array-like\".\n *\n * @param {?} val Variable to test.\n * @return {boolean} Whether variable is an array.\n */\ngoog.isArrayLike = function(val) {\n  var type = goog.typeOf(val);\n  // We do not use goog.isObject here in order to exclude function values.\n  return type == 'array' || type == 'object' && typeof val.length == 'number';\n};\n\n\n/**\n * Returns true if the object looks like a Date. To qualify as Date-like the\n * value needs to be an object and have a getFullYear() function.\n * @param {?} val Variable to test.\n * @return {boolean} Whether variable is a like a Date.\n */\ngoog.isDateLike = function(val) {\n  return goog.isObject(val) && typeof val.getFullYear == 'function';\n};\n\n\n/**\n * Returns true if the specified value is a function.\n * @param {?} val Variable to test.\n * @return {boolean} Whether variable is a function.\n */\ngoog.isFunction = function(val) {\n  return goog.typeOf(val) == 'function';\n};\n\n\n/**\n * Returns true if the specified value is an object.  This includes arrays and\n * functions.\n * @param {?} val Variable to test.\n * @return {boolean} Whether variable is an object.\n */\ngoog.isObject = function(val) {\n  var type = typeof val;\n  return type == 'object' && val != null || type == 'function';\n  // return Object(val) === val also works, but is slower, especially if val is\n  // not an object.\n};\n\n\n/**\n * Gets a unique ID for an object. This mutates the object so that further calls\n * with the same object as a parameter returns the same value. The unique ID is\n * guaranteed to be unique across the current session amongst objects that are\n * passed into `getUid`. There is no guarantee that the ID is unique or\n * consistent across sessions. It is unsafe to generate unique ID for function\n * prototypes.\n *\n * @param {Object} obj The object to get the unique ID for.\n * @return {number} The unique ID for the object.\n */\ngoog.getUid = function(obj) {\n  // TODO(arv): Make the type stricter, do not accept null.\n  return Object.prototype.hasOwnProperty.call(obj, goog.UID_PROPERTY_) &&\n      obj[goog.UID_PROPERTY_] ||\n      (obj[goog.UID_PROPERTY_] = ++goog.uidCounter_);\n};\n\n\n/**\n * Whether the given object is already assigned a unique ID.\n *\n * This does not modify the object.\n *\n * @param {!Object} obj The object to check.\n * @return {boolean} Whether there is an assigned unique id for the object.\n */\ngoog.hasUid = function(obj) {\n  return !!obj[goog.UID_PROPERTY_];\n};\n\n\n/**\n * Removes the unique ID from an object. This is useful if the object was\n * previously mutated using `goog.getUid` in which case the mutation is\n * undone.\n * @param {Object} obj The object to remove the unique ID field from.\n */\ngoog.removeUid = function(obj) {\n  // TODO(arv): Make the type stricter, do not accept null.\n\n  // In IE, DOM nodes are not instances of Object and throw an exception if we\n  // try to delete.  Instead we try to use removeAttribute.\n  if (obj !== null && 'removeAttribute' in obj) {\n    obj.removeAttribute(goog.UID_PROPERTY_);\n  }\n\n  try {\n    delete obj[goog.UID_PROPERTY_];\n  } catch (ex) {\n  }\n};\n\n\n/**\n * Name for unique ID property. Initialized in a way to help avoid collisions\n * with other closure JavaScript on the same page.\n * @type {string}\n * @private\n */\ngoog.UID_PROPERTY_ = 'closure_uid_' + ((Math.random() * 1e9) >>> 0);\n\n\n/**\n * Counter for UID.\n * @type {number}\n * @private\n */\ngoog.uidCounter_ = 0;\n\n\n/**\n * Adds a hash code field to an object. The hash code is unique for the\n * given object.\n * @param {Object} obj The object to get the hash code for.\n * @return {number} The hash code for the object.\n * @deprecated Use goog.getUid instead.\n */\ngoog.getHashCode = goog.getUid;\n\n\n/**\n * Removes the hash code field from an object.\n * @param {Object} obj The object to remove the field from.\n * @deprecated Use goog.removeUid instead.\n */\ngoog.removeHashCode = goog.removeUid;\n\n\n/**\n * Clones a value. The input may be an Object, Array, or basic type. Objects and\n * arrays will be cloned recursively.\n *\n * WARNINGS:\n * <code>goog.cloneObject</code> does not detect reference loops. Objects that\n * refer to themselves will cause infinite recursion.\n *\n * <code>goog.cloneObject</code> is unaware of unique identifiers, and copies\n * UIDs created by <code>getUid</code> into cloned results.\n *\n * @param {*} obj The value to clone.\n * @return {*} A clone of the input value.\n * @deprecated goog.cloneObject is unsafe. Prefer the goog.object methods.\n */\ngoog.cloneObject = function(obj) {\n  var type = goog.typeOf(obj);\n  if (type == 'object' || type == 'array') {\n    if (typeof obj.clone === 'function') {\n      return obj.clone();\n    }\n    var clone = type == 'array' ? [] : {};\n    for (var key in obj) {\n      clone[key] = goog.cloneObject(obj[key]);\n    }\n    return clone;\n  }\n\n  return obj;\n};\n\n\n/**\n * A native implementation of goog.bind.\n * @param {?function(this:T, ...)} fn A function to partially apply.\n * @param {T} selfObj Specifies the object which this should point to when the\n *     function is run.\n * @param {...*} var_args Additional arguments that are partially applied to the\n *     function.\n * @return {!Function} A partially-applied form of the function goog.bind() was\n *     invoked as a method of.\n * @template T\n * @private\n */\ngoog.bindNative_ = function(fn, selfObj, var_args) {\n  return /** @type {!Function} */ (fn.call.apply(fn.bind, arguments));\n};\n\n\n/**\n * A pure-JS implementation of goog.bind.\n * @param {?function(this:T, ...)} fn A function to partially apply.\n * @param {T} selfObj Specifies the object which this should point to when the\n *     function is run.\n * @param {...*} var_args Additional arguments that are partially applied to the\n *     function.\n * @return {!Function} A partially-applied form of the function goog.bind() was\n *     invoked as a method of.\n * @template T\n * @private\n */\ngoog.bindJs_ = function(fn, selfObj, var_args) {\n  if (!fn) {\n    throw new Error();\n  }\n\n  if (arguments.length > 2) {\n    var boundArgs = Array.prototype.slice.call(arguments, 2);\n    return function() {\n      // Prepend the bound arguments to the current arguments.\n      var newArgs = Array.prototype.slice.call(arguments);\n      Array.prototype.unshift.apply(newArgs, boundArgs);\n      return fn.apply(selfObj, newArgs);\n    };\n\n  } else {\n    return function() {\n      return fn.apply(selfObj, arguments);\n    };\n  }\n};\n\n\n/**\n * Partially applies this function to a particular 'this object' and zero or\n * more arguments. The result is a new function with some arguments of the first\n * function pre-filled and the value of this 'pre-specified'.\n *\n * Remaining arguments specified at call-time are appended to the pre-specified\n * ones.\n *\n * Also see: {@link #partial}.\n *\n * Usage:\n * <pre>var barMethBound = goog.bind(myFunction, myObj, 'arg1', 'arg2');\n * barMethBound('arg3', 'arg4');</pre>\n *\n * @param {?function(this:T, ...)} fn A function to partially apply.\n * @param {T} selfObj Specifies the object which this should point to when the\n *     function is run.\n * @param {...*} var_args Additional arguments that are partially applied to the\n *     function.\n * @return {!Function} A partially-applied form of the function goog.bind() was\n *     invoked as a method of.\n * @template T\n * @suppress {deprecated} See above.\n */\ngoog.bind = function(fn, selfObj, var_args) {\n  // TODO(nicksantos): narrow the type signature.\n  if (Function.prototype.bind &&\n      // NOTE(nicksantos): Somebody pulled base.js into the default Chrome\n      // extension environment. This means that for Chrome extensions, they get\n      // the implementation of Function.prototype.bind that calls goog.bind\n      // instead of the native one. Even worse, we don't want to introduce a\n      // circular dependency between goog.bind and Function.prototype.bind, so\n      // we have to hack this to make sure it works correctly.\n      Function.prototype.bind.toString().indexOf('native code') != -1) {\n    goog.bind = goog.bindNative_;\n  } else {\n    goog.bind = goog.bindJs_;\n  }\n  return goog.bind.apply(null, arguments);\n};\n\n\n/**\n * Like goog.bind(), except that a 'this object' is not required. Useful when\n * the target function is already bound.\n *\n * Usage:\n * var g = goog.partial(f, arg1, arg2);\n * g(arg3, arg4);\n *\n * @param {Function} fn A function to partially apply.\n * @param {...*} var_args Additional arguments that are partially applied to fn.\n * @return {!Function} A partially-applied form of the function goog.partial()\n *     was invoked as a method of.\n */\ngoog.partial = function(fn, var_args) {\n  var args = Array.prototype.slice.call(arguments, 1);\n  return function() {\n    // Clone the array (with slice()) and append additional arguments\n    // to the existing arguments.\n    var newArgs = args.slice();\n    newArgs.push.apply(newArgs, arguments);\n    return fn.apply(/** @type {?} */ (this), newArgs);\n  };\n};\n\n\n/**\n * Copies all the members of a source object to a target object. This method\n * does not work on all browsers for all objects that contain keys such as\n * toString or hasOwnProperty. Use goog.object.extend for this purpose.\n *\n * NOTE: Some have advocated for the use of goog.mixin to setup classes\n * with multiple inheritence (traits, mixins, etc).  However, as it simply\n * uses \"for in\", this is not compatible with ES6 classes whose methods are\n * non-enumerable.  Changing this, would break cases where non-enumerable\n * properties are not expected.\n *\n * @param {Object} target Target.\n * @param {Object} source Source.\n * @deprecated Prefer Object.assign\n */\ngoog.mixin = function(target, source) {\n  for (var x in source) {\n    target[x] = source[x];\n  }\n\n  // For IE7 or lower, the for-in-loop does not contain any properties that are\n  // not enumerable on the prototype object (for example, isPrototypeOf from\n  // Object.prototype) but also it will not include 'replace' on objects that\n  // extend String and change 'replace' (not that it is common for anyone to\n  // extend anything except Object).\n};\n\n\n/**\n * @return {number} An integer value representing the number of milliseconds\n *     between midnight, January 1, 1970 and the current time.\n * @deprecated Use Date.now\n */\ngoog.now = (goog.TRUSTED_SITE && Date.now) || (function() {\n             // Unary plus operator converts its operand to a number which in\n             // the case of\n             // a date is done by calling getTime().\n             return +new Date();\n           });\n\n\n/**\n * Evals JavaScript in the global scope.  In IE this uses execScript, other\n * browsers use goog.global.eval. If goog.global.eval does not evaluate in the\n * global scope (for example, in Safari), appends a script tag instead.\n * Throws an exception if neither execScript or eval is defined.\n * @param {string} script JavaScript string.\n */\ngoog.globalEval = function(script) {\n  if (goog.global.execScript) {\n    goog.global.execScript(script, 'JavaScript');\n  } else if (goog.global.eval) {\n    // Test to see if eval works\n    if (goog.evalWorksForGlobals_ == null) {\n      try {\n        goog.global.eval('var _evalTest_ = 1;');\n      } catch (ignore) {\n      }\n      if (typeof goog.global['_evalTest_'] != 'undefined') {\n        try {\n          delete goog.global['_evalTest_'];\n        } catch (ignore) {\n          // Microsoft edge fails the deletion above in strict mode.\n        }\n        goog.evalWorksForGlobals_ = true;\n      } else {\n        goog.evalWorksForGlobals_ = false;\n      }\n    }\n\n    if (goog.evalWorksForGlobals_) {\n      goog.global.eval(script);\n    } else {\n      /** @type {!Document} */\n      var doc = goog.global.document;\n      var scriptElt =\n          /** @type {!HTMLScriptElement} */ (doc.createElement('script'));\n      scriptElt.type = 'text/javascript';\n      scriptElt.defer = false;\n      // Note(user): can't use .innerHTML since \"t('<test>')\" will fail and\n      // .text doesn't work in Safari 2.  Therefore we append a text node.\n      scriptElt.appendChild(doc.createTextNode(script));\n      doc.head.appendChild(scriptElt);\n      doc.head.removeChild(scriptElt);\n    }\n  } else {\n    throw new Error('goog.globalEval not available');\n  }\n};\n\n\n/**\n * Indicates whether or not we can call 'eval' directly to eval code in the\n * global scope. Set to a Boolean by the first call to goog.globalEval (which\n * empirically tests whether eval works for globals). @see goog.globalEval\n * @type {?boolean}\n * @private\n */\ngoog.evalWorksForGlobals_ = null;\n\n\n/**\n * Optional map of CSS class names to obfuscated names used with\n * goog.getCssName().\n * @private {!Object<string, string>|undefined}\n * @see goog.setCssNameMapping\n */\ngoog.cssNameMapping_;\n\n\n/**\n * Optional obfuscation style for CSS class names. Should be set to either\n * 'BY_WHOLE' or 'BY_PART' if defined.\n * @type {string|undefined}\n * @private\n * @see goog.setCssNameMapping\n */\ngoog.cssNameMappingStyle_;\n\n\n\n/**\n * A hook for modifying the default behavior goog.getCssName. The function\n * if present, will receive the standard output of the goog.getCssName as\n * its input.\n *\n * @type {(function(string):string)|undefined}\n */\ngoog.global.CLOSURE_CSS_NAME_MAP_FN;\n\n\n/**\n * Handles strings that are intended to be used as CSS class names.\n *\n * This function works in tandem with @see goog.setCssNameMapping.\n *\n * Without any mapping set, the arguments are simple joined with a hyphen and\n * passed through unaltered.\n *\n * When there is a mapping, there are two possible styles in which these\n * mappings are used. In the BY_PART style, each part (i.e. in between hyphens)\n * of the passed in css name is rewritten according to the map. In the BY_WHOLE\n * style, the full css name is looked up in the map directly. If a rewrite is\n * not specified by the map, the compiler will output a warning.\n *\n * When the mapping is passed to the compiler, it will replace calls to\n * goog.getCssName with the strings from the mapping, e.g.\n *     var x = goog.getCssName('foo');\n *     var y = goog.getCssName(this.baseClass, 'active');\n *  becomes:\n *     var x = 'foo';\n *     var y = this.baseClass + '-active';\n *\n * If one argument is passed it will be processed, if two are passed only the\n * modifier will be processed, as it is assumed the first argument was generated\n * as a result of calling goog.getCssName.\n *\n * @param {string} className The class name.\n * @param {string=} opt_modifier A modifier to be appended to the class name.\n * @return {string} The class name or the concatenation of the class name and\n *     the modifier.\n */\ngoog.getCssName = function(className, opt_modifier) {\n  // String() is used for compatibility with compiled soy where the passed\n  // className can be non-string objects.\n  if (String(className).charAt(0) == '.') {\n    throw new Error(\n        'className passed in goog.getCssName must not start with \".\".' +\n        ' You passed: ' + className);\n  }\n\n  var getMapping = function(cssName) {\n    return goog.cssNameMapping_[cssName] || cssName;\n  };\n\n  var renameByParts = function(cssName) {\n    // Remap all the parts individually.\n    var parts = cssName.split('-');\n    var mapped = [];\n    for (var i = 0; i < parts.length; i++) {\n      mapped.push(getMapping(parts[i]));\n    }\n    return mapped.join('-');\n  };\n\n  var rename;\n  if (goog.cssNameMapping_) {\n    rename =\n        goog.cssNameMappingStyle_ == 'BY_WHOLE' ? getMapping : renameByParts;\n  } else {\n    rename = function(a) {\n      return a;\n    };\n  }\n\n  var result =\n      opt_modifier ? className + '-' + rename(opt_modifier) : rename(className);\n\n  // The special CLOSURE_CSS_NAME_MAP_FN allows users to specify further\n  // processing of the class name.\n  if (goog.global.CLOSURE_CSS_NAME_MAP_FN) {\n    return goog.global.CLOSURE_CSS_NAME_MAP_FN(result);\n  }\n\n  return result;\n};\n\n\n/**\n * Sets the map to check when returning a value from goog.getCssName(). Example:\n * <pre>\n * goog.setCssNameMapping({\n *   \"goog\": \"a\",\n *   \"disabled\": \"b\",\n * });\n *\n * var x = goog.getCssName('goog');\n * // The following evaluates to: \"a a-b\".\n * goog.getCssName('goog') + ' ' + goog.getCssName(x, 'disabled')\n * </pre>\n * When declared as a map of string literals to string literals, the JSCompiler\n * will replace all calls to goog.getCssName() using the supplied map if the\n * --process_closure_primitives flag is set.\n *\n * @param {!Object} mapping A map of strings to strings where keys are possible\n *     arguments to goog.getCssName() and values are the corresponding values\n *     that should be returned.\n * @param {string=} opt_style The style of css name mapping. There are two valid\n *     options: 'BY_PART', and 'BY_WHOLE'.\n * @see goog.getCssName for a description.\n */\ngoog.setCssNameMapping = function(mapping, opt_style) {\n  goog.cssNameMapping_ = mapping;\n  goog.cssNameMappingStyle_ = opt_style;\n};\n\n\n/**\n * To use CSS renaming in compiled mode, one of the input files should have a\n * call to goog.setCssNameMapping() with an object literal that the JSCompiler\n * can extract and use to replace all calls to goog.getCssName(). In uncompiled\n * mode, JavaScript code should be loaded before this base.js file that declares\n * a global variable, CLOSURE_CSS_NAME_MAPPING, which is used below. This is\n * to ensure that the mapping is loaded before any calls to goog.getCssName()\n * are made in uncompiled mode.\n *\n * A hook for overriding the CSS name mapping.\n * @type {!Object<string, string>|undefined}\n */\ngoog.global.CLOSURE_CSS_NAME_MAPPING;\n\n\nif (!COMPILED && goog.global.CLOSURE_CSS_NAME_MAPPING) {\n  // This does not call goog.setCssNameMapping() because the JSCompiler\n  // requires that goog.setCssNameMapping() be called with an object literal.\n  goog.cssNameMapping_ = goog.global.CLOSURE_CSS_NAME_MAPPING;\n}\n\n\n/**\n * Gets a localized message.\n *\n * This function is a compiler primitive. If you give the compiler a localized\n * message bundle, it will replace the string at compile-time with a localized\n * version, and expand goog.getMsg call to a concatenated string.\n *\n * Messages must be initialized in the form:\n * <code>\n * var MSG_NAME = goog.getMsg('Hello {$placeholder}', {'placeholder': 'world'});\n * </code>\n *\n * This function produces a string which should be treated as plain text. Use\n * {@link goog.html.SafeHtmlFormatter} in conjunction with goog.getMsg to\n * produce SafeHtml.\n *\n * @param {string} str Translatable string, places holders in the form {$foo}.\n * @param {Object<string, string>=} opt_values Maps place holder name to value.\n * @param {{html: boolean}=} opt_options Options:\n *     html: Escape '<' in str to '&lt;'. Used by Closure Templates where the\n *     generated code size and performance is critical which is why {@link\n *     goog.html.SafeHtmlFormatter} is not used. The value must be literal true\n *     or false.\n * @return {string} message with placeholders filled.\n */\ngoog.getMsg = function(str, opt_values, opt_options) {\n  if (opt_options && opt_options.html) {\n    // Note that '&' is not replaced because the translation can contain HTML\n    // entities.\n    str = str.replace(/</g, '&lt;');\n  }\n  if (opt_values) {\n    str = str.replace(/\\{\\$([^}]+)}/g, function(match, key) {\n      return (opt_values != null && key in opt_values) ? opt_values[key] :\n                                                         match;\n    });\n  }\n  return str;\n};\n\n\n/**\n * Gets a localized message. If the message does not have a translation, gives a\n * fallback message.\n *\n * This is useful when introducing a new message that has not yet been\n * translated into all languages.\n *\n * This function is a compiler primitive. Must be used in the form:\n * <code>var x = goog.getMsgWithFallback(MSG_A, MSG_B);</code>\n * where MSG_A and MSG_B were initialized with goog.getMsg.\n *\n * @param {string} a The preferred message.\n * @param {string} b The fallback message.\n * @return {string} The best translated message.\n */\ngoog.getMsgWithFallback = function(a, b) {\n  return a;\n};\n\n\n/**\n * Exposes an unobfuscated global namespace path for the given object.\n * Note that fields of the exported object *will* be obfuscated, unless they are\n * exported in turn via this function or goog.exportProperty.\n *\n * Also handy for making public items that are defined in anonymous closures.\n *\n * ex. goog.exportSymbol('public.path.Foo', Foo);\n *\n * ex. goog.exportSymbol('public.path.Foo.staticFunction', Foo.staticFunction);\n *     public.path.Foo.staticFunction();\n *\n * ex. goog.exportSymbol('public.path.Foo.prototype.myMethod',\n *                       Foo.prototype.myMethod);\n *     new public.path.Foo().myMethod();\n *\n * @param {string} publicPath Unobfuscated name to export.\n * @param {*} object Object the name should point to.\n * @param {Object=} opt_objectToExportTo The object to add the path to; default\n *     is goog.global.\n */\ngoog.exportSymbol = function(publicPath, object, opt_objectToExportTo) {\n  goog.exportPath_(publicPath, object, opt_objectToExportTo);\n};\n\n\n/**\n * Exports a property unobfuscated into the object's namespace.\n * ex. goog.exportProperty(Foo, 'staticFunction', Foo.staticFunction);\n * ex. goog.exportProperty(Foo.prototype, 'myMethod', Foo.prototype.myMethod);\n * @param {Object} object Object whose static property is being exported.\n * @param {string} publicName Unobfuscated name to export.\n * @param {*} symbol Object the name should point to.\n */\ngoog.exportProperty = function(object, publicName, symbol) {\n  object[publicName] = symbol;\n};\n\n\n/**\n * Inherit the prototype methods from one constructor into another.\n *\n * Usage:\n * <pre>\n * function ParentClass(a, b) { }\n * ParentClass.prototype.foo = function(a) { };\n *\n * function ChildClass(a, b, c) {\n *   ChildClass.base(this, 'constructor', a, b);\n * }\n * goog.inherits(ChildClass, ParentClass);\n *\n * var child = new ChildClass('a', 'b', 'see');\n * child.foo(); // This works.\n * </pre>\n *\n * @param {!Function} childCtor Child class.\n * @param {!Function} parentCtor Parent class.\n * @suppress {strictMissingProperties} superClass_ and base is not defined on\n *    Function.\n */\ngoog.inherits = function(childCtor, parentCtor) {\n  /** @constructor */\n  function tempCtor() {}\n  tempCtor.prototype = parentCtor.prototype;\n  childCtor.superClass_ = parentCtor.prototype;\n  childCtor.prototype = new tempCtor();\n  /** @override */\n  childCtor.prototype.constructor = childCtor;\n\n  /**\n   * Calls superclass constructor/method.\n   *\n   * This function is only available if you use goog.inherits to\n   * express inheritance relationships between classes.\n   *\n   * NOTE: This is a replacement for goog.base and for superClass_\n   * property defined in childCtor.\n   *\n   * @param {!Object} me Should always be \"this\".\n   * @param {string} methodName The method name to call. Calling\n   *     superclass constructor can be done with the special string\n   *     'constructor'.\n   * @param {...*} var_args The arguments to pass to superclass\n   *     method/constructor.\n   * @return {*} The return value of the superclass method/constructor.\n   */\n  childCtor.base = function(me, methodName, var_args) {\n    // Copying using loop to avoid deop due to passing arguments object to\n    // function. This is faster in many JS engines as of late 2014.\n    var args = new Array(arguments.length - 2);\n    for (var i = 2; i < arguments.length; i++) {\n      args[i - 2] = arguments[i];\n    }\n    return parentCtor.prototype[methodName].apply(me, args);\n  };\n};\n\n\n/**\n * Allow for aliasing within scope functions.  This function exists for\n * uncompiled code - in compiled code the calls will be inlined and the aliases\n * applied.  In uncompiled code the function is simply run since the aliases as\n * written are valid JavaScript.\n *\n *\n * @param {function()} fn Function to call.  This function can contain aliases\n *     to namespaces (e.g. \"var dom = goog.dom\") or classes\n *     (e.g. \"var Timer = goog.Timer\").\n * @deprecated Use goog.module instead.\n */\ngoog.scope = function(fn) {\n  if (goog.isInModuleLoader_()) {\n    throw new Error('goog.scope is not supported within a module.');\n  }\n  fn.call(goog.global);\n};\n\n\n/*\n * To support uncompiled, strict mode bundles that use eval to divide source\n * like so:\n *    eval('someSource;//# sourceUrl sourcefile.js');\n * We need to export the globally defined symbols \"goog\" and \"COMPILED\".\n * Exporting \"goog\" breaks the compiler optimizations, so we required that\n * be defined externally.\n * NOTE: We don't use goog.exportSymbol here because we don't want to trigger\n * extern generation when that compiler option is enabled.\n */\nif (!COMPILED) {\n  goog.global['COMPILED'] = COMPILED;\n}\n\n\n//==============================================================================\n// goog.defineClass implementation\n//==============================================================================\n\n\n/**\n * Creates a restricted form of a Closure \"class\":\n *   - from the compiler's perspective, the instance returned from the\n *     constructor is sealed (no new properties may be added).  This enables\n *     better checks.\n *   - the compiler will rewrite this definition to a form that is optimal\n *     for type checking and optimization (initially this will be a more\n *     traditional form).\n *\n * @param {Function} superClass The superclass, Object or null.\n * @param {goog.defineClass.ClassDescriptor} def\n *     An object literal describing\n *     the class.  It may have the following properties:\n *     \"constructor\": the constructor function\n *     \"statics\": an object literal containing methods to add to the constructor\n *        as \"static\" methods or a function that will receive the constructor\n *        function as its only parameter to which static properties can\n *        be added.\n *     all other properties are added to the prototype.\n * @return {!Function} The class constructor.\n * @deprecated Use ES6 class syntax instead.\n */\ngoog.defineClass = function(superClass, def) {\n  // TODO(johnlenz): consider making the superClass an optional parameter.\n  var constructor = def.constructor;\n  var statics = def.statics;\n  // Wrap the constructor prior to setting up the prototype and static methods.\n  if (!constructor || constructor == Object.prototype.constructor) {\n    constructor = function() {\n      throw new Error(\n          'cannot instantiate an interface (no constructor defined).');\n    };\n  }\n\n  var cls = goog.defineClass.createSealingConstructor_(constructor, superClass);\n  if (superClass) {\n    goog.inherits(cls, superClass);\n  }\n\n  // Remove all the properties that should not be copied to the prototype.\n  delete def.constructor;\n  delete def.statics;\n\n  goog.defineClass.applyProperties_(cls.prototype, def);\n  if (statics != null) {\n    if (statics instanceof Function) {\n      statics(cls);\n    } else {\n      goog.defineClass.applyProperties_(cls, statics);\n    }\n  }\n\n  return cls;\n};\n\n\n/**\n * @typedef {{\n *   constructor: (!Function|undefined),\n *   statics: (Object|undefined|function(Function):void)\n * }}\n */\ngoog.defineClass.ClassDescriptor;\n\n\n/**\n * @define {boolean} Whether the instances returned by goog.defineClass should\n *     be sealed when possible.\n *\n * When sealing is disabled the constructor function will not be wrapped by\n * goog.defineClass, making it incompatible with ES6 class methods.\n */\ngoog.defineClass.SEAL_CLASS_INSTANCES =\n    goog.define('goog.defineClass.SEAL_CLASS_INSTANCES', goog.DEBUG);\n\n\n/**\n * If goog.defineClass.SEAL_CLASS_INSTANCES is enabled and Object.seal is\n * defined, this function will wrap the constructor in a function that seals the\n * results of the provided constructor function.\n *\n * @param {!Function} ctr The constructor whose results maybe be sealed.\n * @param {Function} superClass The superclass constructor.\n * @return {!Function} The replacement constructor.\n * @private\n */\ngoog.defineClass.createSealingConstructor_ = function(ctr, superClass) {\n  if (!goog.defineClass.SEAL_CLASS_INSTANCES) {\n    // Do now wrap the constructor when sealing is disabled. Angular code\n    // depends on this for injection to work properly.\n    return ctr;\n  }\n\n  // Compute whether the constructor is sealable at definition time, rather\n  // than when the instance is being constructed.\n  var superclassSealable = !goog.defineClass.isUnsealable_(superClass);\n\n  /**\n   * @this {Object}\n   * @return {?}\n   */\n  var wrappedCtr = function() {\n    // Don't seal an instance of a subclass when it calls the constructor of\n    // its super class as there is most likely still setup to do.\n    var instance = ctr.apply(this, arguments) || this;\n    instance[goog.UID_PROPERTY_] = instance[goog.UID_PROPERTY_];\n\n    if (this.constructor === wrappedCtr && superclassSealable &&\n        Object.seal instanceof Function) {\n      Object.seal(instance);\n    }\n    return instance;\n  };\n\n  return wrappedCtr;\n};\n\n\n/**\n * @param {Function} ctr The constructor to test.\n * @return {boolean} Whether the constructor has been tagged as unsealable\n *     using goog.tagUnsealableClass.\n * @private\n */\ngoog.defineClass.isUnsealable_ = function(ctr) {\n  return ctr && ctr.prototype &&\n      ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_];\n};\n\n\n// TODO(johnlenz): share these values with the goog.object\n/**\n * The names of the fields that are defined on Object.prototype.\n * @type {!Array<string>}\n * @private\n * @const\n */\ngoog.defineClass.OBJECT_PROTOTYPE_FIELDS_ = [\n  'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',\n  'toLocaleString', 'toString', 'valueOf'\n];\n\n\n// TODO(johnlenz): share this function with the goog.object\n/**\n * @param {!Object} target The object to add properties to.\n * @param {!Object} source The object to copy properties from.\n * @private\n */\ngoog.defineClass.applyProperties_ = function(target, source) {\n  // TODO(johnlenz): update this to support ES5 getters/setters\n\n  var key;\n  for (key in source) {\n    if (Object.prototype.hasOwnProperty.call(source, key)) {\n      target[key] = source[key];\n    }\n  }\n\n  // For IE the for-in-loop does not contain any properties that are not\n  // enumerable on the prototype object (for example isPrototypeOf from\n  // Object.prototype) and it will also not include 'replace' on objects that\n  // extend String and change 'replace' (not that it is common for anyone to\n  // extend anything except Object).\n  for (var i = 0; i < goog.defineClass.OBJECT_PROTOTYPE_FIELDS_.length; i++) {\n    key = goog.defineClass.OBJECT_PROTOTYPE_FIELDS_[i];\n    if (Object.prototype.hasOwnProperty.call(source, key)) {\n      target[key] = source[key];\n    }\n  }\n};\n\n\n/**\n * Sealing classes breaks the older idiom of assigning properties on the\n * prototype rather than in the constructor. As such, goog.defineClass\n * must not seal subclasses of these old-style classes until they are fixed.\n * Until then, this marks a class as \"broken\", instructing defineClass\n * not to seal subclasses.\n * @param {!Function} ctr The legacy constructor to tag as unsealable.\n */\ngoog.tagUnsealableClass = function(ctr) {\n  if (!COMPILED && goog.defineClass.SEAL_CLASS_INSTANCES) {\n    ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_] = true;\n  }\n};\n\n\n/**\n * Name for unsealable tag property.\n * @const @private {string}\n */\ngoog.UNSEALABLE_CONSTRUCTOR_PROPERTY_ = 'goog_defineClass_legacy_unsealable';\n\n\n// There's a bug in the compiler where without collapse properties the\n// Closure namespace defines do not guard code correctly. To help reduce code\n// size also check for !COMPILED even though it redundant until this is fixed.\nif (!COMPILED && goog.DEPENDENCIES_ENABLED) {\n\n  /**\n   * Tries to detect whether is in the context of an HTML document.\n   * @return {boolean} True if it looks like HTML document.\n   * @private\n   */\n  goog.inHtmlDocument_ = function() {\n    /** @type {!Document} */\n    var doc = goog.global.document;\n    return doc != null && 'write' in doc;  // XULDocument misses write.\n  };\n\n\n  /**\n   * We'd like to check for if the document readyState is 'loading'; however\n   * there are bugs on IE 10 and below where the readyState being anything other\n   * than 'complete' is not reliable.\n   * @return {boolean}\n   * @private\n   */\n  goog.isDocumentLoading_ = function() {\n    // attachEvent is available on IE 6 thru 10 only, and thus can be used to\n    // detect those browsers.\n    /** @type {!HTMLDocument} */\n    var doc = goog.global.document;\n    return doc.attachEvent ? doc.readyState != 'complete' :\n                             doc.readyState == 'loading';\n  };\n\n\n  /**\n   * Tries to detect the base path of base.js script that bootstraps Closure.\n   * @private\n   */\n  goog.findBasePath_ = function() {\n    if (goog.global.CLOSURE_BASE_PATH != undefined &&\n        // Anti DOM-clobbering runtime check (b/37736576).\n        typeof goog.global.CLOSURE_BASE_PATH === 'string') {\n      goog.basePath = goog.global.CLOSURE_BASE_PATH;\n      return;\n    } else if (!goog.inHtmlDocument_()) {\n      return;\n    }\n    /** @type {!Document} */\n    var doc = goog.global.document;\n    // If we have a currentScript available, use it exclusively.\n    var currentScript = doc.currentScript;\n    if (currentScript) {\n      var scripts = [currentScript];\n    } else {\n      var scripts = doc.getElementsByTagName('SCRIPT');\n    }\n    // Search backwards since the current script is in almost all cases the one\n    // that has base.js.\n    for (var i = scripts.length - 1; i >= 0; --i) {\n      var script = /** @type {!HTMLScriptElement} */ (scripts[i]);\n      var src = script.src;\n      var qmark = src.lastIndexOf('?');\n      var l = qmark == -1 ? src.length : qmark;\n      if (src.substr(l - 7, 7) == 'base.js') {\n        goog.basePath = src.substr(0, l - 7);\n        return;\n      }\n    }\n  };\n\n  goog.findBasePath_();\n\n  /** @struct @constructor @final */\n  goog.Transpiler = function() {\n    /** @private {?Object<string, boolean>} */\n    this.requiresTranspilation_ = null;\n    /** @private {string} */\n    this.transpilationTarget_ = goog.TRANSPILE_TO_LANGUAGE;\n  };\n  /**\n   * Returns a newly created map from language mode string to a boolean\n   * indicating whether transpilation should be done for that mode as well as\n   * the highest level language that this environment supports.\n   *\n   * Guaranteed invariant:\n   * For any two modes, l1 and l2 where l2 is a newer mode than l1,\n   * `map[l1] == true` implies that `map[l2] == true`.\n   *\n   * Note this method is extracted and used elsewhere, so it cannot rely on\n   * anything external (it should easily be able to be transformed into a\n   * standalone, top level function).\n   *\n   * @private\n   * @return {{\n   *   target: string,\n   *   map: !Object<string, boolean>\n   * }}\n   */\n  goog.Transpiler.prototype.createRequiresTranspilation_ = function() {\n    var transpilationTarget = 'es3';\n    var /** !Object<string, boolean> */ requiresTranspilation = {'es3': false};\n    var transpilationRequiredForAllLaterModes = false;\n\n    /**\n     * Adds an entry to requiresTranspliation for the given language mode.\n     *\n     * IMPORTANT: Calls must be made in order from oldest to newest language\n     * mode.\n     * @param {string} modeName\n     * @param {function(): boolean} isSupported Returns true if the JS engine\n     *     supports the given mode.\n     */\n    function addNewerLanguageTranspilationCheck(modeName, isSupported) {\n      if (transpilationRequiredForAllLaterModes) {\n        requiresTranspilation[modeName] = true;\n      } else if (isSupported()) {\n        transpilationTarget = modeName;\n        requiresTranspilation[modeName] = false;\n      } else {\n        requiresTranspilation[modeName] = true;\n        transpilationRequiredForAllLaterModes = true;\n      }\n    }\n\n    /**\n     * Does the given code evaluate without syntax errors and return a truthy\n     * result?\n     */\n    function /** boolean */ evalCheck(/** string */ code) {\n      try {\n        return !!eval(code);\n      } catch (ignored) {\n        return false;\n      }\n    }\n\n    var userAgent = goog.global.navigator && goog.global.navigator.userAgent ?\n        goog.global.navigator.userAgent :\n        '';\n\n    // Identify ES3-only browsers by their incorrect treatment of commas.\n    addNewerLanguageTranspilationCheck('es5', function() {\n      return evalCheck('[1,].length==1');\n    });\n    addNewerLanguageTranspilationCheck('es6', function() {\n      // Edge has a non-deterministic (i.e., not reproducible) bug with ES6:\n      // https://github.com/Microsoft/ChakraCore/issues/1496.\n      var re = /Edge\\/(\\d+)(\\.\\d)*/i;\n      var edgeUserAgent = userAgent.match(re);\n      if (edgeUserAgent) {\n        // The Reflect.construct test below is flaky on Edge. It can sometimes\n        // pass or fail on 40 15.15063, so just exit early for Edge and treat\n        // it as ES5. Until we're on a more up to date version just always use\n        // ES5. See https://github.com/Microsoft/ChakraCore/issues/3217.\n        return false;\n      }\n      // Test es6: [FF50 (?), Edge 14 (?), Chrome 50]\n      //   (a) default params (specifically shadowing locals),\n      //   (b) destructuring, (c) block-scoped functions,\n      //   (d) for-of (const), (e) new.target/Reflect.construct\n      var es6fullTest =\n          'class X{constructor(){if(new.target!=String)throw 1;this.x=42}}' +\n          'let q=Reflect.construct(X,[],String);if(q.x!=42||!(q instanceof ' +\n          'String))throw 1;for(const a of[2,3]){if(a==2)continue;function ' +\n          'f(z={a}){let a=0;return z.a}{function f(){return 0;}}return f()' +\n          '==3}';\n\n      return evalCheck('(()=>{\"use strict\";' + es6fullTest + '})()');\n    });\n    // ** and **= are the only new features in 'es7'\n    addNewerLanguageTranspilationCheck('es7', function() {\n      return evalCheck('2 ** 2 == 4');\n    });\n    // async functions are the only new features in 'es8'\n    addNewerLanguageTranspilationCheck('es8', function() {\n      return evalCheck('async () => 1, true');\n    });\n    addNewerLanguageTranspilationCheck('es9', function() {\n      return evalCheck('({...rest} = {}), true');\n    });\n    addNewerLanguageTranspilationCheck('es_next', function() {\n      return false;  // assume it always need to transpile\n    });\n    return {target: transpilationTarget, map: requiresTranspilation};\n  };\n\n\n  /**\n   * Determines whether the given language needs to be transpiled.\n   * @param {string} lang\n   * @param {string|undefined} module\n   * @return {boolean}\n   */\n  goog.Transpiler.prototype.needsTranspile = function(lang, module) {\n    if (goog.TRANSPILE == 'always') {\n      return true;\n    } else if (goog.TRANSPILE == 'never') {\n      return false;\n    } else if (!this.requiresTranspilation_) {\n      var obj = this.createRequiresTranspilation_();\n      this.requiresTranspilation_ = obj.map;\n      this.transpilationTarget_ = this.transpilationTarget_ || obj.target;\n    }\n    if (lang in this.requiresTranspilation_) {\n      if (this.requiresTranspilation_[lang]) {\n        return true;\n      } else if (\n          goog.inHtmlDocument_() && module == 'es6' &&\n          !('noModule' in goog.global.document.createElement('script'))) {\n        return true;\n      } else {\n        return false;\n      }\n    } else {\n      throw new Error('Unknown language mode: ' + lang);\n    }\n  };\n\n\n  /**\n   * Lazily retrieves the transpiler and applies it to the source.\n   * @param {string} code JS code.\n   * @param {string} path Path to the code.\n   * @return {string} The transpiled code.\n   */\n  goog.Transpiler.prototype.transpile = function(code, path) {\n    // TODO(johnplaisted): We should delete goog.transpile_ and just have this\n    // function. But there's some compile error atm where goog.global is being\n    // stripped incorrectly without this.\n    return goog.transpile_(code, path, this.transpilationTarget_);\n  };\n\n\n  /** @private @final {!goog.Transpiler} */\n  goog.transpiler_ = new goog.Transpiler();\n\n  /**\n   * Rewrites closing script tags in input to avoid ending an enclosing script\n   * tag.\n   *\n   * @param {string} str\n   * @return {string}\n   * @private\n   */\n  goog.protectScriptTag_ = function(str) {\n    return str.replace(/<\\/(SCRIPT)/ig, '\\\\x3c/$1');\n  };\n\n\n  /**\n   * A debug loader is responsible for downloading and executing javascript\n   * files in an unbundled, uncompiled environment.\n   *\n   * This can be custimized via the setDependencyFactory method, or by\n   * CLOSURE_IMPORT_SCRIPT/CLOSURE_LOAD_FILE_SYNC.\n   *\n   * @struct @constructor @final @private\n   */\n  goog.DebugLoader_ = function() {\n    /** @private @const {!Object<string, !goog.Dependency>} */\n    this.dependencies_ = {};\n    /** @private @const {!Object<string, string>} */\n    this.idToPath_ = {};\n    /** @private @const {!Object<string, boolean>} */\n    this.written_ = {};\n    /** @private @const {!Array<!goog.Dependency>} */\n    this.loadingDeps_ = [];\n    /** @private {!Array<!goog.Dependency>} */\n    this.depsToLoad_ = [];\n    /** @private {boolean} */\n    this.paused_ = false;\n    /** @private {!goog.DependencyFactory} */\n    this.factory_ = new goog.DependencyFactory(goog.transpiler_);\n    /** @private @const {!Object<string, !Function>} */\n    this.deferredCallbacks_ = {};\n    /** @private @const {!Array<string>} */\n    this.deferredQueue_ = [];\n  };\n\n  /**\n   * @param {!Array<string>} namespaces\n   * @param {function(): undefined} callback Function to call once all the\n   *     namespaces have loaded.\n   */\n  goog.DebugLoader_.prototype.bootstrap = function(namespaces, callback) {\n    var cb = callback;\n    function resolve() {\n      if (cb) {\n        goog.global.setTimeout(cb, 0);\n        cb = null;\n      }\n    }\n\n    if (!namespaces.length) {\n      resolve();\n      return;\n    }\n\n    var deps = [];\n    for (var i = 0; i < namespaces.length; i++) {\n      var path = this.getPathFromDeps_(namespaces[i]);\n      if (!path) {\n        throw new Error('Unregonized namespace: ' + namespaces[i]);\n      }\n      deps.push(this.dependencies_[path]);\n    }\n\n    var require = goog.require;\n    var loaded = 0;\n    for (var i = 0; i < namespaces.length; i++) {\n      require(namespaces[i]);\n      deps[i].onLoad(function() {\n        if (++loaded == namespaces.length) {\n          resolve();\n        }\n      });\n    }\n  };\n\n\n  /**\n   * Loads the Closure Dependency file.\n   *\n   * Exposed a public function so CLOSURE_NO_DEPS can be set to false, base\n   * loaded, setDependencyFactory called, and then this called. i.e. allows\n   * custom loading of the deps file.\n   */\n  goog.DebugLoader_.prototype.loadClosureDeps = function() {\n    // Circumvent addDependency, which would try to transpile deps.js if\n    // transpile is set to always.\n    var relPath = 'deps.js';\n    this.depsToLoad_.push(this.factory_.createDependency(\n        goog.normalizePath_(goog.basePath + relPath), relPath, [], [], {},\n        false));\n    this.loadDeps_();\n  };\n\n\n  /**\n   * Notifies the debug loader when a dependency has been requested.\n   *\n   * @param {string} absPathOrId Path of the dependency or goog id.\n   * @param {boolean=} opt_force\n   */\n  goog.DebugLoader_.prototype.requested = function(absPathOrId, opt_force) {\n    var path = this.getPathFromDeps_(absPathOrId);\n    if (path &&\n        (opt_force || this.areDepsLoaded_(this.dependencies_[path].requires))) {\n      var callback = this.deferredCallbacks_[path];\n      if (callback) {\n        delete this.deferredCallbacks_[path];\n        callback();\n      }\n    }\n  };\n\n\n  /**\n   * Sets the dependency factory, which can be used to create custom\n   * goog.Dependency implementations to control how dependencies are loaded.\n   *\n   * @param {!goog.DependencyFactory} factory\n   */\n  goog.DebugLoader_.prototype.setDependencyFactory = function(factory) {\n    this.factory_ = factory;\n  };\n\n\n  /**\n   * Travserses the dependency graph and queues the given dependency, and all of\n   * its transitive dependencies, for loading and then starts loading if not\n   * paused.\n   *\n   * @param {string} namespace\n   * @private\n   */\n  goog.DebugLoader_.prototype.load_ = function(namespace) {\n    if (!this.getPathFromDeps_(namespace)) {\n      var errorMessage = 'goog.require could not find: ' + namespace;\n\n      goog.logToConsole_(errorMessage);\n      throw Error(errorMessage);\n    } else {\n      var loader = this;\n\n      var deps = [];\n\n      /** @param {string} namespace */\n      var visit = function(namespace) {\n        var path = loader.getPathFromDeps_(namespace);\n\n        if (!path) {\n          throw new Error('Bad dependency path or symbol: ' + namespace);\n        }\n\n        if (loader.written_[path]) {\n          return;\n        }\n\n        loader.written_[path] = true;\n\n        var dep = loader.dependencies_[path];\n        for (var i = 0; i < dep.requires.length; i++) {\n          if (!goog.isProvided_(dep.requires[i])) {\n            visit(dep.requires[i]);\n          }\n        }\n\n        deps.push(dep);\n      };\n\n      visit(namespace);\n\n      var wasLoading = !!this.depsToLoad_.length;\n      this.depsToLoad_ = this.depsToLoad_.concat(deps);\n\n      if (!this.paused_ && !wasLoading) {\n        this.loadDeps_();\n      }\n    }\n  };\n\n\n  /**\n   * Loads any queued dependencies until they are all loaded or paused.\n   *\n   * @private\n   */\n  goog.DebugLoader_.prototype.loadDeps_ = function() {\n    var loader = this;\n    var paused = this.paused_;\n\n    while (this.depsToLoad_.length && !paused) {\n      (function() {\n        var loadCallDone = false;\n        var dep = loader.depsToLoad_.shift();\n\n        var loaded = false;\n        loader.loading_(dep);\n\n        var controller = {\n          pause: function() {\n            if (loadCallDone) {\n              throw new Error('Cannot call pause after the call to load.');\n            } else {\n              paused = true;\n            }\n          },\n          resume: function() {\n            if (loadCallDone) {\n              loader.resume_();\n            } else {\n              // Some dep called pause and then resume in the same load call.\n              // Just keep running this same loop.\n              paused = false;\n            }\n          },\n          loaded: function() {\n            if (loaded) {\n              throw new Error('Double call to loaded.');\n            }\n\n            loaded = true;\n            loader.loaded_(dep);\n          },\n          pending: function() {\n            // Defensive copy.\n            var pending = [];\n            for (var i = 0; i < loader.loadingDeps_.length; i++) {\n              pending.push(loader.loadingDeps_[i]);\n            }\n            return pending;\n          },\n          /**\n           * @param {goog.ModuleType} type\n           */\n          setModuleState: function(type) {\n            goog.moduleLoaderState_ = {\n              type: type,\n              moduleName: '',\n              declareLegacyNamespace: false\n            };\n          },\n          /** @type {function(string, string, string=)} */\n          registerEs6ModuleExports: function(\n              path, exports, opt_closureNamespace) {\n            if (opt_closureNamespace) {\n              goog.loadedModules_[opt_closureNamespace] = {\n                exports: exports,\n                type: goog.ModuleType.ES6,\n                moduleId: opt_closureNamespace || ''\n              };\n            }\n          },\n          /** @type {function(string, ?)} */\n          registerGoogModuleExports: function(moduleId, exports) {\n            goog.loadedModules_[moduleId] = {\n              exports: exports,\n              type: goog.ModuleType.GOOG,\n              moduleId: moduleId\n            };\n          },\n          clearModuleState: function() {\n            goog.moduleLoaderState_ = null;\n          },\n          defer: function(callback) {\n            if (loadCallDone) {\n              throw new Error(\n                  'Cannot register with defer after the call to load.');\n            }\n            loader.defer_(dep, callback);\n          },\n          areDepsLoaded: function() {\n            return loader.areDepsLoaded_(dep.requires);\n          }\n        };\n\n        try {\n          dep.load(controller);\n        } finally {\n          loadCallDone = true;\n        }\n      })();\n    }\n\n    if (paused) {\n      this.pause_();\n    }\n  };\n\n\n  /** @private */\n  goog.DebugLoader_.prototype.pause_ = function() {\n    this.paused_ = true;\n  };\n\n\n  /** @private */\n  goog.DebugLoader_.prototype.resume_ = function() {\n    if (this.paused_) {\n      this.paused_ = false;\n      this.loadDeps_();\n    }\n  };\n\n\n  /**\n   * Marks the given dependency as loading (load has been called but it has not\n   * yet marked itself as finished). Useful for dependencies that want to know\n   * what else is loading. Example: goog.modules cannot eval if there are\n   * loading dependencies.\n   *\n   * @param {!goog.Dependency} dep\n   * @private\n   */\n  goog.DebugLoader_.prototype.loading_ = function(dep) {\n    this.loadingDeps_.push(dep);\n  };\n\n\n  /**\n   * Marks the given dependency as having finished loading and being available\n   * for require.\n   *\n   * @param {!goog.Dependency} dep\n   * @private\n   */\n  goog.DebugLoader_.prototype.loaded_ = function(dep) {\n    for (var i = 0; i < this.loadingDeps_.length; i++) {\n      if (this.loadingDeps_[i] == dep) {\n        this.loadingDeps_.splice(i, 1);\n        break;\n      }\n    }\n\n    for (var i = 0; i < this.deferredQueue_.length; i++) {\n      if (this.deferredQueue_[i] == dep.path) {\n        this.deferredQueue_.splice(i, 1);\n        break;\n      }\n    }\n\n    if (this.loadingDeps_.length == this.deferredQueue_.length &&\n        !this.depsToLoad_.length) {\n      // Something has asked to load these, but they may not be directly\n      // required again later, so load them now that we know we're done loading\n      // everything else. e.g. a goog module entry point.\n      while (this.deferredQueue_.length) {\n        this.requested(this.deferredQueue_.shift(), true);\n      }\n    }\n\n    dep.loaded();\n  };\n\n\n  /**\n   * @param {!Array<string>} pathsOrIds\n   * @return {boolean}\n   * @private\n   */\n  goog.DebugLoader_.prototype.areDepsLoaded_ = function(pathsOrIds) {\n    for (var i = 0; i < pathsOrIds.length; i++) {\n      var path = this.getPathFromDeps_(pathsOrIds[i]);\n      if (!path ||\n          (!(path in this.deferredCallbacks_) &&\n           !goog.isProvided_(pathsOrIds[i]))) {\n        return false;\n      }\n    }\n\n    return true;\n  };\n\n\n  /**\n   * @param {string} absPathOrId\n   * @return {?string}\n   * @private\n   */\n  goog.DebugLoader_.prototype.getPathFromDeps_ = function(absPathOrId) {\n    if (absPathOrId in this.idToPath_) {\n      return this.idToPath_[absPathOrId];\n    } else if (absPathOrId in this.dependencies_) {\n      return absPathOrId;\n    } else {\n      return null;\n    }\n  };\n\n\n  /**\n   * @param {!goog.Dependency} dependency\n   * @param {!Function} callback\n   * @private\n   */\n  goog.DebugLoader_.prototype.defer_ = function(dependency, callback) {\n    this.deferredCallbacks_[dependency.path] = callback;\n    this.deferredQueue_.push(dependency.path);\n  };\n\n\n  /**\n   * Interface for goog.Dependency implementations to have some control over\n   * loading of dependencies.\n   *\n   * @record\n   */\n  goog.LoadController = function() {};\n\n\n  /**\n   * Tells the controller to halt loading of more dependencies.\n   */\n  goog.LoadController.prototype.pause = function() {};\n\n\n  /**\n   * Tells the controller to resume loading of more dependencies if paused.\n   */\n  goog.LoadController.prototype.resume = function() {};\n\n\n  /**\n   * Tells the controller that this dependency has finished loading.\n   *\n   * This causes this to be removed from pending() and any load callbacks to\n   * fire.\n   */\n  goog.LoadController.prototype.loaded = function() {};\n\n\n  /**\n   * List of dependencies on which load has been called but which have not\n   * called loaded on their controller. This includes the current dependency.\n   *\n   * @return {!Array<!goog.Dependency>}\n   */\n  goog.LoadController.prototype.pending = function() {};\n\n\n  /**\n   * Registers an object as an ES6 module's exports so that goog.modules may\n   * require it by path.\n   *\n   * @param {string} path Full path of the module.\n   * @param {?} exports\n   * @param {string=} opt_closureNamespace Closure namespace to associate with\n   *     this module.\n   */\n  goog.LoadController.prototype.registerEs6ModuleExports = function(\n      path, exports, opt_closureNamespace) {};\n\n\n  /**\n   * Sets the current module state.\n   *\n   * @param {goog.ModuleType} type Type of module.\n   */\n  goog.LoadController.prototype.setModuleState = function(type) {};\n\n\n  /**\n   * Clears the current module state.\n   */\n  goog.LoadController.prototype.clearModuleState = function() {};\n\n\n  /**\n   * Registers a callback to call once the dependency is actually requested\n   * via goog.require + all of the immediate dependencies have been loaded or\n   * all other files have been loaded. Allows for lazy loading until\n   * require'd without pausing dependency loading, which is needed on old IE.\n   *\n   * @param {!Function} callback\n   */\n  goog.LoadController.prototype.defer = function(callback) {};\n\n\n  /**\n   * @return {boolean}\n   */\n  goog.LoadController.prototype.areDepsLoaded = function() {};\n\n\n  /**\n   * Basic super class for all dependencies Closure Library can load.\n   *\n   * This default implementation is designed to load untranspiled, non-module\n   * scripts in a web broswer.\n   *\n   * For transpiled non-goog.module files {@see goog.TranspiledDependency}.\n   * For goog.modules see {@see goog.GoogModuleDependency}.\n   * For untranspiled ES6 modules {@see goog.Es6ModuleDependency}.\n   *\n   * @param {string} path Absolute path of this script.\n   * @param {string} relativePath Path of this script relative to goog.basePath.\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\n   *     in this file.\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\n   *     this depends on.\n   * @param {!Object<string, string>} loadFlags\n   * @struct @constructor\n   */\n  goog.Dependency = function(\n      path, relativePath, provides, requires, loadFlags) {\n    /** @const */\n    this.path = path;\n    /** @const */\n    this.relativePath = relativePath;\n    /** @const */\n    this.provides = provides;\n    /** @const */\n    this.requires = requires;\n    /** @const */\n    this.loadFlags = loadFlags;\n    /** @private {boolean} */\n    this.loaded_ = false;\n    /** @private {!Array<function()>} */\n    this.loadCallbacks_ = [];\n  };\n\n\n  /**\n   * @return {string} The pathname part of this dependency's path if it is a\n   *     URI.\n   */\n  goog.Dependency.prototype.getPathName = function() {\n    var pathName = this.path;\n    var protocolIndex = pathName.indexOf('://');\n    if (protocolIndex >= 0) {\n      pathName = pathName.substring(protocolIndex + 3);\n      var slashIndex = pathName.indexOf('/');\n      if (slashIndex >= 0) {\n        pathName = pathName.substring(slashIndex + 1);\n      }\n    }\n    return pathName;\n  };\n\n\n  /**\n   * @param {function()} callback Callback to fire as soon as this has loaded.\n   * @final\n   */\n  goog.Dependency.prototype.onLoad = function(callback) {\n    if (this.loaded_) {\n      callback();\n    } else {\n      this.loadCallbacks_.push(callback);\n    }\n  };\n\n\n  /**\n   * Marks this dependency as loaded and fires any callbacks registered with\n   * onLoad.\n   * @final\n   */\n  goog.Dependency.prototype.loaded = function() {\n    this.loaded_ = true;\n    var callbacks = this.loadCallbacks_;\n    this.loadCallbacks_ = [];\n    for (var i = 0; i < callbacks.length; i++) {\n      callbacks[i]();\n    }\n  };\n\n\n  /**\n   * Whether or not document.written / appended script tags should be deferred.\n   *\n   * @private {boolean}\n   */\n  goog.Dependency.defer_ = false;\n\n\n  /**\n   * Map of script ready / state change callbacks. Old IE cannot handle putting\n   * these properties on goog.global.\n   *\n   * @private @const {!Object<string, function(?):undefined>}\n   */\n  goog.Dependency.callbackMap_ = {};\n\n\n  /**\n   * @param {function(...?):?} callback\n   * @return {string}\n   * @private\n   */\n  goog.Dependency.registerCallback_ = function(callback) {\n    var key = Math.random().toString(32);\n    goog.Dependency.callbackMap_[key] = callback;\n    return key;\n  };\n\n\n  /**\n   * @param {string} key\n   * @private\n   */\n  goog.Dependency.unregisterCallback_ = function(key) {\n    delete goog.Dependency.callbackMap_[key];\n  };\n\n\n  /**\n   * @param {string} key\n   * @param {...?} var_args\n   * @private\n   * @suppress {unusedPrivateMembers}\n   */\n  goog.Dependency.callback_ = function(key, var_args) {\n    if (key in goog.Dependency.callbackMap_) {\n      var callback = goog.Dependency.callbackMap_[key];\n      var args = [];\n      for (var i = 1; i < arguments.length; i++) {\n        args.push(arguments[i]);\n      }\n      callback.apply(undefined, args);\n    } else {\n      var errorMessage = 'Callback key ' + key +\n          ' does not exist (was base.js loaded more than once?).';\n      throw Error(errorMessage);\n    }\n  };\n\n\n  /**\n   * Starts loading this dependency. This dependency can pause loading if it\n   * needs to and resume it later via the controller interface.\n   *\n   * When this is loaded it should call controller.loaded(). Note that this will\n   * end up calling the loaded method of this dependency; there is no need to\n   * call it explicitly.\n   *\n   * @param {!goog.LoadController} controller\n   */\n  goog.Dependency.prototype.load = function(controller) {\n    if (goog.global.CLOSURE_IMPORT_SCRIPT) {\n      if (goog.global.CLOSURE_IMPORT_SCRIPT(this.path)) {\n        controller.loaded();\n      } else {\n        controller.pause();\n      }\n      return;\n    }\n\n    if (!goog.inHtmlDocument_()) {\n      goog.logToConsole_(\n          'Cannot use default debug loader outside of HTML documents.');\n      if (this.relativePath == 'deps.js') {\n        // Some old code is relying on base.js auto loading deps.js failing with\n        // no error before later setting CLOSURE_IMPORT_SCRIPT.\n        // CLOSURE_IMPORT_SCRIPT should be set *before* base.js is loaded, or\n        // CLOSURE_NO_DEPS set to true.\n        goog.logToConsole_(\n            'Consider setting CLOSURE_IMPORT_SCRIPT before loading base.js, ' +\n            'or setting CLOSURE_NO_DEPS to true.');\n        controller.loaded();\n      } else {\n        controller.pause();\n      }\n      return;\n    }\n\n    /** @type {!HTMLDocument} */\n    var doc = goog.global.document;\n\n    // If the user tries to require a new symbol after document load,\n    // something has gone terribly wrong. Doing a document.write would\n    // wipe out the page. This does not apply to the CSP-compliant method\n    // of writing script tags.\n    if (doc.readyState == 'complete' &&\n        !goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING) {\n      // Certain test frameworks load base.js multiple times, which tries\n      // to write deps.js each time. If that happens, just fail silently.\n      // These frameworks wipe the page between each load of base.js, so this\n      // is OK.\n      var isDeps = /\\bdeps.js$/.test(this.path);\n      if (isDeps) {\n        controller.loaded();\n        return;\n      } else {\n        throw Error('Cannot write \"' + this.path + '\" after document load');\n      }\n    }\n\n    if (!goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING &&\n        goog.isDocumentLoading_()) {\n      var key = goog.Dependency.registerCallback_(function(script) {\n        if (!goog.DebugLoader_.IS_OLD_IE_ || script.readyState == 'complete') {\n          goog.Dependency.unregisterCallback_(key);\n          controller.loaded();\n        }\n      });\n      var nonceAttr = !goog.DebugLoader_.IS_OLD_IE_ && goog.getScriptNonce() ?\n          ' nonce=\"' + goog.getScriptNonce() + '\"' :\n          '';\n      var event =\n          goog.DebugLoader_.IS_OLD_IE_ ? 'onreadystatechange' : 'onload';\n      var defer = goog.Dependency.defer_ ? 'defer' : '';\n      var script = '<script src=\"' + this.path + '\" ' + event +\n          '=\"goog.Dependency.callback_(\\'' + key +\n          '\\', this)\" type=\"text/javascript\" ' + defer + nonceAttr + '><' +\n          '/script>';\n      doc.write(\n          goog.TRUSTED_TYPES_POLICY_ ?\n              goog.TRUSTED_TYPES_POLICY_.createHTML(script) :\n              script);\n    } else {\n      var scriptEl =\n          /** @type {!HTMLScriptElement} */ (doc.createElement('script'));\n      scriptEl.defer = goog.Dependency.defer_;\n      scriptEl.async = false;\n      scriptEl.type = 'text/javascript';\n\n      // If CSP nonces are used, propagate them to dynamically created scripts.\n      // This is necessary to allow nonce-based CSPs without 'strict-dynamic'.\n      var nonce = goog.getScriptNonce();\n      if (nonce) {\n        scriptEl.setAttribute('nonce', nonce);\n      }\n\n      if (goog.DebugLoader_.IS_OLD_IE_) {\n        // Execution order is not guaranteed on old IE, halt loading and write\n        // these scripts one at a time, after each loads.\n        controller.pause();\n        scriptEl.onreadystatechange = function() {\n          if (scriptEl.readyState == 'loaded' ||\n              scriptEl.readyState == 'complete') {\n            controller.loaded();\n            controller.resume();\n          }\n        };\n      } else {\n        scriptEl.onload = function() {\n          scriptEl.onload = null;\n          controller.loaded();\n        };\n      }\n\n      scriptEl.src = goog.TRUSTED_TYPES_POLICY_ ?\n          goog.TRUSTED_TYPES_POLICY_.createScriptURL(this.path) :\n          this.path;\n      doc.head.appendChild(scriptEl);\n    }\n  };\n\n\n  /**\n   * @param {string} path Absolute path of this script.\n   * @param {string} relativePath Path of this script relative to goog.basePath.\n   * @param {!Array<string>} provides Should be an empty array.\n   *     TODO(johnplaisted) add support for adding closure namespaces to ES6\n   *     modules for interop purposes.\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\n   *     this depends on.\n   * @param {!Object<string, string>} loadFlags\n   * @struct @constructor\n   * @extends {goog.Dependency}\n   */\n  goog.Es6ModuleDependency = function(\n      path, relativePath, provides, requires, loadFlags) {\n    goog.Es6ModuleDependency.base(\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\n  };\n  goog.inherits(goog.Es6ModuleDependency, goog.Dependency);\n\n\n  /** @override */\n  goog.Es6ModuleDependency.prototype.load = function(controller) {\n    if (goog.global.CLOSURE_IMPORT_SCRIPT) {\n      if (goog.global.CLOSURE_IMPORT_SCRIPT(this.path)) {\n        controller.loaded();\n      } else {\n        controller.pause();\n      }\n      return;\n    }\n\n    if (!goog.inHtmlDocument_()) {\n      goog.logToConsole_(\n          'Cannot use default debug loader outside of HTML documents.');\n      controller.pause();\n      return;\n    }\n\n    /** @type {!HTMLDocument} */\n    var doc = goog.global.document;\n\n    var dep = this;\n\n    // TODO(johnplaisted): Does document.writing really speed up anything? Any\n    // difference between this and just waiting for interactive mode and then\n    // appending?\n    function write(src, contents) {\n      if (contents) {\n        var script = '<script type=\"module\" crossorigin>' + contents + '</' +\n            'script>';\n        doc.write(\n            goog.TRUSTED_TYPES_POLICY_ ?\n                goog.TRUSTED_TYPES_POLICY_.createHTML(script) :\n                script);\n      } else {\n        var script = '<script type=\"module\" crossorigin src=\"' + src + '\"></' +\n            'script>';\n        doc.write(\n            goog.TRUSTED_TYPES_POLICY_ ?\n                goog.TRUSTED_TYPES_POLICY_.createHTML(script) :\n                script);\n      }\n    }\n\n    function append(src, contents) {\n      var scriptEl =\n          /** @type {!HTMLScriptElement} */ (doc.createElement('script'));\n      scriptEl.defer = true;\n      scriptEl.async = false;\n      scriptEl.type = 'module';\n      scriptEl.setAttribute('crossorigin', true);\n\n      // If CSP nonces are used, propagate them to dynamically created scripts.\n      // This is necessary to allow nonce-based CSPs without 'strict-dynamic'.\n      var nonce = goog.getScriptNonce();\n      if (nonce) {\n        scriptEl.setAttribute('nonce', nonce);\n      }\n\n      if (contents) {\n        scriptEl.textContent = goog.TRUSTED_TYPES_POLICY_ ?\n            goog.TRUSTED_TYPES_POLICY_.createScript(contents) :\n            contents;\n      } else {\n        scriptEl.src = goog.TRUSTED_TYPES_POLICY_ ?\n            goog.TRUSTED_TYPES_POLICY_.createScriptURL(src) :\n            src;\n      }\n\n      doc.head.appendChild(scriptEl);\n    }\n\n    var create;\n\n    if (goog.isDocumentLoading_()) {\n      create = write;\n      // We can ONLY call document.write if we are guaranteed that any\n      // non-module script tags document.written after this are deferred.\n      // Small optimization, in theory document.writing is faster.\n      goog.Dependency.defer_ = true;\n    } else {\n      create = append;\n    }\n\n    // Write 4 separate tags here:\n    // 1) Sets the module state at the correct time (just before execution).\n    // 2) A src node for this, which just hopefully lets the browser load it a\n    //    little early (no need to parse #3).\n    // 3) Import the module and register it.\n    // 4) Clear the module state at the correct time. Guaranteed to run even\n    //    if there is an error in the module (#3 will not run if there is an\n    //    error in the module).\n    var beforeKey = goog.Dependency.registerCallback_(function() {\n      goog.Dependency.unregisterCallback_(beforeKey);\n      controller.setModuleState(goog.ModuleType.ES6);\n    });\n    create(undefined, 'goog.Dependency.callback_(\"' + beforeKey + '\")');\n\n    // TODO(johnplaisted): Does this really speed up anything?\n    create(this.path, undefined);\n\n    var registerKey = goog.Dependency.registerCallback_(function(exports) {\n      goog.Dependency.unregisterCallback_(registerKey);\n      controller.registerEs6ModuleExports(\n          dep.path, exports, goog.moduleLoaderState_.moduleName);\n    });\n    create(\n        undefined,\n        'import * as m from \"' + this.path + '\"; goog.Dependency.callback_(\"' +\n            registerKey + '\", m)');\n\n    var afterKey = goog.Dependency.registerCallback_(function() {\n      goog.Dependency.unregisterCallback_(afterKey);\n      controller.clearModuleState();\n      controller.loaded();\n    });\n    create(undefined, 'goog.Dependency.callback_(\"' + afterKey + '\")');\n  };\n\n\n  /**\n   * Superclass of any dependency that needs to be loaded into memory,\n   * transformed, and then eval'd (goog.modules and transpiled files).\n   *\n   * @param {string} path Absolute path of this script.\n   * @param {string} relativePath Path of this script relative to goog.basePath.\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\n   *     in this file.\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\n   *     this depends on.\n   * @param {!Object<string, string>} loadFlags\n   * @struct @constructor @abstract\n   * @extends {goog.Dependency}\n   */\n  goog.TransformedDependency = function(\n      path, relativePath, provides, requires, loadFlags) {\n    goog.TransformedDependency.base(\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\n    /** @private {?string} */\n    this.contents_ = null;\n\n    /**\n     * Whether to lazily make the synchronous XHR (when goog.require'd) or make\n     * the synchronous XHR when initially loading. On FireFox 61 there is a bug\n     * where an ES6 module cannot make a synchronous XHR (rather, it can, but if\n     * it does then no other ES6 modules will load after).\n     *\n     * tl;dr we lazy load due to bugs on older browsers and eager load due to\n     * bugs on newer ones.\n     *\n     * https://bugzilla.mozilla.org/show_bug.cgi?id=1477090\n     *\n     * @private @const {boolean}\n     */\n    this.lazyFetch_ = !goog.inHtmlDocument_() ||\n        !('noModule' in goog.global.document.createElement('script'));\n  };\n  goog.inherits(goog.TransformedDependency, goog.Dependency);\n\n\n  /** @override */\n  goog.TransformedDependency.prototype.load = function(controller) {\n    var dep = this;\n\n    function fetch() {\n      dep.contents_ = goog.loadFileSync_(dep.path);\n\n      if (dep.contents_) {\n        dep.contents_ = dep.transform(dep.contents_);\n        if (dep.contents_) {\n          dep.contents_ += '\\n//# sourceURL=' + dep.path;\n        }\n      }\n    }\n\n    if (goog.global.CLOSURE_IMPORT_SCRIPT) {\n      fetch();\n      if (this.contents_ &&\n          goog.global.CLOSURE_IMPORT_SCRIPT('', this.contents_)) {\n        this.contents_ = null;\n        controller.loaded();\n      } else {\n        controller.pause();\n      }\n      return;\n    }\n\n\n    var isEs6 = this.loadFlags['module'] == goog.ModuleType.ES6;\n\n    if (!this.lazyFetch_) {\n      fetch();\n    }\n\n    function load() {\n      if (dep.lazyFetch_) {\n        fetch();\n      }\n\n      if (!dep.contents_) {\n        // loadFileSync_ or transform are responsible. Assume they logged an\n        // error.\n        return;\n      }\n\n      if (isEs6) {\n        controller.setModuleState(goog.ModuleType.ES6);\n      }\n\n      var namespace;\n\n      try {\n        var contents = dep.contents_;\n        dep.contents_ = null;\n        goog.globalEval(contents);\n        if (isEs6) {\n          namespace = goog.moduleLoaderState_.moduleName;\n        }\n      } finally {\n        if (isEs6) {\n          controller.clearModuleState();\n        }\n      }\n\n      if (isEs6) {\n        // Due to circular dependencies this may not be available for require\n        // right now.\n        goog.global['$jscomp']['require']['ensure'](\n            [dep.getPathName()], function() {\n              controller.registerEs6ModuleExports(\n                  dep.path,\n                  goog.global['$jscomp']['require'](dep.getPathName()),\n                  namespace);\n            });\n      }\n\n      controller.loaded();\n    }\n\n    // Do not fetch now; in FireFox 47 the synchronous XHR doesn't block all\n    // events. If we fetched now and then document.write'd the contents the\n    // document.write would be an eval and would execute too soon! Instead write\n    // a script tag to fetch and eval synchronously at the correct time.\n    function fetchInOwnScriptThenLoad() {\n      /** @type {!HTMLDocument} */\n      var doc = goog.global.document;\n\n      var key = goog.Dependency.registerCallback_(function() {\n        goog.Dependency.unregisterCallback_(key);\n        load();\n      });\n\n      var script = '<script type=\"text/javascript\">' +\n          goog.protectScriptTag_('goog.Dependency.callback_(\"' + key + '\");') +\n          '</' +\n          'script>';\n      doc.write(\n          goog.TRUSTED_TYPES_POLICY_ ?\n              goog.TRUSTED_TYPES_POLICY_.createHTML(script) :\n              script);\n    }\n\n    // If one thing is pending it is this.\n    var anythingElsePending = controller.pending().length > 1;\n\n    // If anything else is loading we need to lazy load due to bugs in old IE.\n    // Specifically script tags with src and script tags with contents could\n    // execute out of order if document.write is used, so we cannot use\n    // document.write. Do not pause here; it breaks old IE as well.\n    var useOldIeWorkAround =\n        anythingElsePending && goog.DebugLoader_.IS_OLD_IE_;\n\n    // Additionally if we are meant to defer scripts but the page is still\n    // loading (e.g. an ES6 module is loading) then also defer. Or if we are\n    // meant to defer and anything else is pending then defer (those may be\n    // scripts that did not need transformation and are just script tags with\n    // defer set to true, and we need to evaluate after that deferred script).\n    var needsAsyncLoading = goog.Dependency.defer_ &&\n        (anythingElsePending || goog.isDocumentLoading_());\n\n    if (useOldIeWorkAround || needsAsyncLoading) {\n      // Note that we only defer when we have to rather than 100% of the time.\n      // Always defering would work, but then in theory the order of\n      // goog.require calls would then matter. We want to enforce that most of\n      // the time the order of the require calls does not matter.\n      controller.defer(function() {\n        load();\n      });\n      return;\n    }\n    // TODO(johnplaisted): Externs are missing onreadystatechange for\n    // HTMLDocument.\n    /** @type {?} */\n    var doc = goog.global.document;\n\n    var isInternetExplorer =\n        goog.inHtmlDocument_() && 'ActiveXObject' in goog.global;\n\n    // Don't delay in any version of IE. There's bug around this that will\n    // cause out of order script execution. This means that on older IE ES6\n    // modules will load too early (while the document is still loading + the\n    // dom is not available). The other option is to load too late (when the\n    // document is complete and the onload even will never fire). This seems\n    // to be the lesser of two evils as scripts already act like the former.\n    if (isEs6 && goog.inHtmlDocument_() && goog.isDocumentLoading_() &&\n        !isInternetExplorer) {\n      goog.Dependency.defer_ = true;\n      // Transpiled ES6 modules still need to load like regular ES6 modules,\n      // aka only after the document is interactive.\n      controller.pause();\n      var oldCallback = doc.onreadystatechange;\n      doc.onreadystatechange = function() {\n        if (doc.readyState == 'interactive') {\n          doc.onreadystatechange = oldCallback;\n          load();\n          controller.resume();\n        }\n        if (goog.isFunction(oldCallback)) {\n          oldCallback.apply(undefined, arguments);\n        }\n      };\n    } else {\n      // Always eval on old IE.\n      if (goog.DebugLoader_.IS_OLD_IE_ || !goog.inHtmlDocument_() ||\n          !goog.isDocumentLoading_()) {\n        load();\n      } else {\n        fetchInOwnScriptThenLoad();\n      }\n    }\n  };\n\n\n  /**\n   * @param {string} contents\n   * @return {string}\n   * @abstract\n   */\n  goog.TransformedDependency.prototype.transform = function(contents) {};\n\n\n  /**\n   * Any non-goog.module dependency which needs to be transpiled before eval.\n   *\n   * @param {string} path Absolute path of this script.\n   * @param {string} relativePath Path of this script relative to goog.basePath.\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\n   *     in this file.\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\n   *     this depends on.\n   * @param {!Object<string, string>} loadFlags\n   * @param {!goog.Transpiler} transpiler\n   * @struct @constructor\n   * @extends {goog.TransformedDependency}\n   */\n  goog.TranspiledDependency = function(\n      path, relativePath, provides, requires, loadFlags, transpiler) {\n    goog.TranspiledDependency.base(\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\n    /** @protected @const*/\n    this.transpiler = transpiler;\n  };\n  goog.inherits(goog.TranspiledDependency, goog.TransformedDependency);\n\n\n  /** @override */\n  goog.TranspiledDependency.prototype.transform = function(contents) {\n    // Transpile with the pathname so that ES6 modules are domain agnostic.\n    return this.transpiler.transpile(contents, this.getPathName());\n  };\n\n\n  /**\n   * An ES6 module dependency that was transpiled to a jscomp module outside\n   * of the debug loader, e.g. server side.\n   *\n   * @param {string} path Absolute path of this script.\n   * @param {string} relativePath Path of this script relative to goog.basePath.\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\n   *     in this file.\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\n   *     this depends on.\n   * @param {!Object<string, string>} loadFlags\n   * @struct @constructor\n   * @extends {goog.TransformedDependency}\n   */\n  goog.PreTranspiledEs6ModuleDependency = function(\n      path, relativePath, provides, requires, loadFlags) {\n    goog.PreTranspiledEs6ModuleDependency.base(\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\n  };\n  goog.inherits(\n      goog.PreTranspiledEs6ModuleDependency, goog.TransformedDependency);\n\n\n  /** @override */\n  goog.PreTranspiledEs6ModuleDependency.prototype.transform = function(\n      contents) {\n    return contents;\n  };\n\n\n  /**\n   * A goog.module, transpiled or not. Will always perform some minimal\n   * transformation even when not transpiled to wrap in a goog.loadModule\n   * statement.\n   *\n   * @param {string} path Absolute path of this script.\n   * @param {string} relativePath Path of this script relative to goog.basePath.\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\n   *     in this file.\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\n   *     this depends on.\n   * @param {!Object<string, string>} loadFlags\n   * @param {boolean} needsTranspile\n   * @param {!goog.Transpiler} transpiler\n   * @struct @constructor\n   * @extends {goog.TransformedDependency}\n   */\n  goog.GoogModuleDependency = function(\n      path, relativePath, provides, requires, loadFlags, needsTranspile,\n      transpiler) {\n    goog.GoogModuleDependency.base(\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\n    /** @private @const */\n    this.needsTranspile_ = needsTranspile;\n    /** @private @const */\n    this.transpiler_ = transpiler;\n  };\n  goog.inherits(goog.GoogModuleDependency, goog.TransformedDependency);\n\n\n  /** @override */\n  goog.GoogModuleDependency.prototype.transform = function(contents) {\n    if (this.needsTranspile_) {\n      contents = this.transpiler_.transpile(contents, this.getPathName());\n    }\n\n    if (!goog.LOAD_MODULE_USING_EVAL || goog.global.JSON === undefined) {\n      return '' +\n          'goog.loadModule(function(exports) {' +\n          '\"use strict\";' + contents +\n          '\\n' +  // terminate any trailing single line comment.\n          ';return exports' +\n          '});' +\n          '\\n//# sourceURL=' + this.path + '\\n';\n    } else {\n      return '' +\n          'goog.loadModule(' +\n          goog.global.JSON.stringify(\n              contents + '\\n//# sourceURL=' + this.path + '\\n') +\n          ');';\n    }\n  };\n\n\n  /**\n   * Whether the browser is IE9 or earlier, which needs special handling\n   * for deferred modules.\n   * @const @private {boolean}\n   */\n  goog.DebugLoader_.IS_OLD_IE_ = !!(\n      !goog.global.atob && goog.global.document && goog.global.document['all']);\n\n\n  /**\n   * @param {string} relPath\n   * @param {!Array<string>|undefined} provides\n   * @param {!Array<string>} requires\n   * @param {boolean|!Object<string>=} opt_loadFlags\n   * @see goog.addDependency\n   */\n  goog.DebugLoader_.prototype.addDependency = function(\n      relPath, provides, requires, opt_loadFlags) {\n    provides = provides || [];\n    relPath = relPath.replace(/\\\\/g, '/');\n    var path = goog.normalizePath_(goog.basePath + relPath);\n    if (!opt_loadFlags || typeof opt_loadFlags === 'boolean') {\n      opt_loadFlags = opt_loadFlags ? {'module': goog.ModuleType.GOOG} : {};\n    }\n    var dep = this.factory_.createDependency(\n        path, relPath, provides, requires, opt_loadFlags,\n        goog.transpiler_.needsTranspile(\n            opt_loadFlags['lang'] || 'es3', opt_loadFlags['module']));\n    this.dependencies_[path] = dep;\n    for (var i = 0; i < provides.length; i++) {\n      this.idToPath_[provides[i]] = path;\n    }\n    this.idToPath_[relPath] = path;\n  };\n\n\n  /**\n   * Creates goog.Dependency instances for the debug loader to load.\n   *\n   * Should be overridden to have the debug loader use custom subclasses of\n   * goog.Dependency.\n   *\n   * @param {!goog.Transpiler} transpiler\n   * @struct @constructor\n   */\n  goog.DependencyFactory = function(transpiler) {\n    /** @protected @const */\n    this.transpiler = transpiler;\n  };\n\n\n  /**\n   * @param {string} path Absolute path of the file.\n   * @param {string} relativePath Path relative to closure’s base.js.\n   * @param {!Array<string>} provides Array of provided goog.provide/module ids.\n   * @param {!Array<string>} requires Array of required goog.provide/module /\n   *     relative ES6 module paths.\n   * @param {!Object<string, string>} loadFlags\n   * @param {boolean} needsTranspile True if the file needs to be transpiled\n   *     per the goog.Transpiler.\n   * @return {!goog.Dependency}\n   */\n  goog.DependencyFactory.prototype.createDependency = function(\n      path, relativePath, provides, requires, loadFlags, needsTranspile) {\n\n    if (loadFlags['module'] == goog.ModuleType.GOOG) {\n      return new goog.GoogModuleDependency(\n          path, relativePath, provides, requires, loadFlags, needsTranspile,\n          this.transpiler);\n    } else if (needsTranspile) {\n      return new goog.TranspiledDependency(\n          path, relativePath, provides, requires, loadFlags, this.transpiler);\n    } else {\n      if (loadFlags['module'] == goog.ModuleType.ES6) {\n        if (goog.TRANSPILE == 'never' && goog.ASSUME_ES_MODULES_TRANSPILED) {\n          return new goog.PreTranspiledEs6ModuleDependency(\n              path, relativePath, provides, requires, loadFlags);\n        } else {\n          return new goog.Es6ModuleDependency(\n              path, relativePath, provides, requires, loadFlags);\n        }\n      } else {\n        return new goog.Dependency(\n            path, relativePath, provides, requires, loadFlags);\n      }\n    }\n  };\n\n\n  /** @private @const */\n  goog.debugLoader_ = new goog.DebugLoader_();\n\n\n  /**\n   * Loads the Closure Dependency file.\n   *\n   * Exposed a public function so CLOSURE_NO_DEPS can be set to false, base\n   * loaded, setDependencyFactory called, and then this called. i.e. allows\n   * custom loading of the deps file.\n   */\n  goog.loadClosureDeps = function() {\n    goog.debugLoader_.loadClosureDeps();\n  };\n\n\n  /**\n   * Sets the dependency factory, which can be used to create custom\n   * goog.Dependency implementations to control how dependencies are loaded.\n   *\n   * Note: if you wish to call this function and provide your own implemnetation\n   * it is a wise idea to set CLOSURE_NO_DEPS to true, otherwise the dependency\n   * file and all of its goog.addDependency calls will use the default factory.\n   * You can call goog.loadClosureDeps to load the Closure dependency file\n   * later, after your factory is injected.\n   *\n   * @param {!goog.DependencyFactory} factory\n   */\n  goog.setDependencyFactory = function(factory) {\n    goog.debugLoader_.setDependencyFactory(factory);\n  };\n\n\n  if (!goog.global.CLOSURE_NO_DEPS) {\n    goog.debugLoader_.loadClosureDeps();\n  }\n\n\n  /**\n   * Bootstraps the given namespaces and calls the callback once they are\n   * available either via goog.require. This is a replacement for using\n   * `goog.require` to bootstrap Closure JavaScript. Previously a `goog.require`\n   * in an HTML file would guarantee that the require'd namespace was available\n   * in the next immediate script tag. With ES6 modules this no longer a\n   * guarantee.\n   *\n   * @param {!Array<string>} namespaces\n   * @param {function(): ?} callback Function to call once all the namespaces\n   *     have loaded. Always called asynchronously.\n   */\n  goog.bootstrap = function(namespaces, callback) {\n    goog.debugLoader_.bootstrap(namespaces, callback);\n  };\n}\n\n\n/**\n * @define {string} Trusted Types policy name. If non-empty then Closure will\n * use Trusted Types.\n */\ngoog.TRUSTED_TYPES_POLICY_NAME =\n    goog.define('goog.TRUSTED_TYPES_POLICY_NAME', '');\n\n\n/**\n * Returns the parameter.\n * @param {string} s\n * @return {string}\n * @private\n */\ngoog.identity_ = function(s) {\n  return s;\n};\n\n\n/**\n * Creates Trusted Types policy if Trusted Types are supported by the browser.\n * The policy just blesses any string as a Trusted Type. It is not visibility\n * restricted because anyone can also call TrustedTypes.createPolicy directly.\n * However, the allowed names should be restricted by a HTTP header and the\n * reference to the created policy should be visibility restricted.\n * @param {string} name\n * @return {?TrustedTypePolicy}\n */\ngoog.createTrustedTypesPolicy = function(name) {\n  var policy = null;\n  // TODO(koto): Remove window.TrustedTypes variant when the newer API ships.\n  var policyFactory = goog.global.trustedTypes || goog.global.TrustedTypes;\n  if (!policyFactory || !policyFactory.createPolicy) {\n    return policy;\n  }\n  // TrustedTypes.createPolicy throws if called with a name that is already\n  // registered, even in report-only mode. Until the API changes, catch the\n  // error not to break the applications functionally. In such case, the code\n  // will fall back to using regular Safe Types.\n  // TODO(koto): Remove catching once createPolicy API stops throwing.\n  try {\n    policy = policyFactory.createPolicy(name, {\n      createHTML: goog.identity_,\n      createScript: goog.identity_,\n      createScriptURL: goog.identity_,\n      createURL: goog.identity_\n    });\n  } catch (e) {\n    goog.logToConsole_(e.message);\n  }\n  return policy;\n};\n\n\n/** @private @const {?TrustedTypePolicy} */\ngoog.TRUSTED_TYPES_POLICY_ = goog.TRUSTED_TYPES_POLICY_NAME ?\n    goog.createTrustedTypesPolicy(goog.TRUSTED_TYPES_POLICY_NAME + '#base') :\n    null;\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Implements the disposable interface. The dispose method is used\n * to clean up references and resources.\n */\n\n\ngoog.provide('goog.Disposable');\ngoog.provide('goog.dispose');\ngoog.provide('goog.disposeAll');\n\ngoog.require('goog.disposable.IDisposable');\n\n\n\n/**\n * Class that provides the basic implementation for disposable objects. If your\n * class holds references or resources that can't be collected by standard GC,\n * it should extend this class or implement the disposable interface (defined\n * in goog.disposable.IDisposable). See description of\n * goog.disposable.IDisposable for examples of cleanup.\n * @constructor\n * @implements {goog.disposable.IDisposable}\n */\ngoog.Disposable = function() {\n  /**\n   * If monitoring the goog.Disposable instances is enabled, stores the creation\n   * stack trace of the Disposable instance.\n   * @type {string|undefined}\n   */\n  this.creationStack;\n\n  if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {\n    if (goog.Disposable.INCLUDE_STACK_ON_CREATION) {\n      this.creationStack = new Error().stack;\n    }\n    goog.Disposable.instances_[goog.getUid(this)] = this;\n  }\n  // Support sealing\n  this.disposed_ = this.disposed_;\n  this.onDisposeCallbacks_ = this.onDisposeCallbacks_;\n};\n\n\n/**\n * @enum {number} Different monitoring modes for Disposable.\n */\ngoog.Disposable.MonitoringMode = {\n  /**\n   * No monitoring.\n   */\n  OFF: 0,\n  /**\n   * Creating and disposing the goog.Disposable instances is monitored. All\n   * disposable objects need to call the `goog.Disposable` base\n   * constructor. The PERMANENT mode must be switched on before creating any\n   * goog.Disposable instances.\n   */\n  PERMANENT: 1,\n  /**\n   * INTERACTIVE mode can be switched on and off on the fly without producing\n   * errors. It also doesn't warn if the disposable objects don't call the\n   * `goog.Disposable` base constructor.\n   */\n  INTERACTIVE: 2\n};\n\n\n/**\n * @define {number} The monitoring mode of the goog.Disposable\n *     instances. Default is OFF. Switching on the monitoring is only\n *     recommended for debugging because it has a significant impact on\n *     performance and memory usage. If switched off, the monitoring code\n *     compiles down to 0 bytes.\n */\ngoog.Disposable.MONITORING_MODE =\n    goog.define('goog.Disposable.MONITORING_MODE', 0);\n\n\n/**\n * @define {boolean} Whether to attach creation stack to each created disposable\n *     instance; This is only relevant for when MonitoringMode != OFF.\n */\ngoog.Disposable.INCLUDE_STACK_ON_CREATION =\n    goog.define('goog.Disposable.INCLUDE_STACK_ON_CREATION', true);\n\n\n/**\n * Maps the unique ID of every undisposed `goog.Disposable` object to\n * the object itself.\n * @type {!Object<number, !goog.Disposable>}\n * @private\n */\ngoog.Disposable.instances_ = {};\n\n\n/**\n * @return {!Array<!goog.Disposable>} All `goog.Disposable` objects that\n *     haven't been disposed of.\n */\ngoog.Disposable.getUndisposedObjects = function() {\n  var ret = [];\n  for (var id in goog.Disposable.instances_) {\n    if (goog.Disposable.instances_.hasOwnProperty(id)) {\n      ret.push(goog.Disposable.instances_[Number(id)]);\n    }\n  }\n  return ret;\n};\n\n\n/**\n * Clears the registry of undisposed objects but doesn't dispose of them.\n */\ngoog.Disposable.clearUndisposedObjects = function() {\n  goog.Disposable.instances_ = {};\n};\n\n\n/**\n * Whether the object has been disposed of.\n * @type {boolean}\n * @private\n */\ngoog.Disposable.prototype.disposed_ = false;\n\n\n/**\n * Callbacks to invoke when this object is disposed.\n * @type {Array<!Function>}\n * @private\n */\ngoog.Disposable.prototype.onDisposeCallbacks_;\n\n\n/**\n * @return {boolean} Whether the object has been disposed of.\n * @override\n */\ngoog.Disposable.prototype.isDisposed = function() {\n  return this.disposed_;\n};\n\n\n/**\n * @return {boolean} Whether the object has been disposed of.\n * @deprecated Use {@link #isDisposed} instead.\n */\ngoog.Disposable.prototype.getDisposed = goog.Disposable.prototype.isDisposed;\n\n\n/**\n * Disposes of the object. If the object hasn't already been disposed of, calls\n * {@link #disposeInternal}. Classes that extend `goog.Disposable` should\n * override {@link #disposeInternal} in order to cleanup references, resources\n * and other disposable objects. Reentrant.\n *\n * @return {void} Nothing.\n * @override\n */\ngoog.Disposable.prototype.dispose = function() {\n  if (!this.disposed_) {\n    // Set disposed_ to true first, in case during the chain of disposal this\n    // gets disposed recursively.\n    this.disposed_ = true;\n    this.disposeInternal();\n    if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {\n      var uid = goog.getUid(this);\n      if (goog.Disposable.MONITORING_MODE ==\n              goog.Disposable.MonitoringMode.PERMANENT &&\n          !goog.Disposable.instances_.hasOwnProperty(uid)) {\n        throw new Error(\n            this + ' did not call the goog.Disposable base ' +\n            'constructor or was disposed of after a clearUndisposedObjects ' +\n            'call');\n      }\n      if (goog.Disposable.MONITORING_MODE !=\n              goog.Disposable.MonitoringMode.OFF &&\n          this.onDisposeCallbacks_ && this.onDisposeCallbacks_.length > 0) {\n        throw new Error(\n            this + ' did not empty its onDisposeCallbacks queue. This ' +\n            'probably means it overrode dispose() or disposeInternal() ' +\n            'without calling the superclass\\' method.');\n      }\n      delete goog.Disposable.instances_[uid];\n    }\n  }\n};\n\n\n/**\n * Associates a disposable object with this object so that they will be disposed\n * together.\n * @param {goog.disposable.IDisposable} disposable that will be disposed when\n *     this object is disposed.\n */\ngoog.Disposable.prototype.registerDisposable = function(disposable) {\n  this.addOnDisposeCallback(goog.partial(goog.dispose, disposable));\n};\n\n\n/**\n * Invokes a callback function when this object is disposed. Callbacks are\n * invoked in the order in which they were added. If a callback is added to\n * an already disposed Disposable, it will be called immediately.\n * @param {function(this:T):?} callback The callback function.\n * @param {T=} opt_scope An optional scope to call the callback in.\n * @template T\n */\ngoog.Disposable.prototype.addOnDisposeCallback = function(callback, opt_scope) {\n  if (this.disposed_) {\n    opt_scope !== undefined ? callback.call(opt_scope) : callback();\n    return;\n  }\n  if (!this.onDisposeCallbacks_) {\n    this.onDisposeCallbacks_ = [];\n  }\n\n  this.onDisposeCallbacks_.push(\n      opt_scope !== undefined ? goog.bind(callback, opt_scope) : callback);\n};\n\n\n/**\n * Performs appropriate cleanup. See description of goog.disposable.IDisposable\n * for examples. Classes that extend `goog.Disposable` should override this\n * method. Not reentrant. To avoid calling it twice, it must only be called from\n * the subclass' `disposeInternal` method. Everywhere else the public `dispose`\n * method must be used. For example:\n *\n * <pre>\n * mypackage.MyClass = function() {\n * mypackage.MyClass.base(this, 'constructor');\n *     // Constructor logic specific to MyClass.\n *     ...\n *   };\n *   goog.inherits(mypackage.MyClass, goog.Disposable);\n *\n *   mypackage.MyClass.prototype.disposeInternal = function() {\n *     // Dispose logic specific to MyClass.\n *     ...\n *     // Call superclass's disposeInternal at the end of the subclass's, like\n *     // in C++, to avoid hard-to-catch issues.\n *     mypackage.MyClass.base(this, 'disposeInternal');\n *   };\n * </pre>\n *\n * @protected\n */\ngoog.Disposable.prototype.disposeInternal = function() {\n  if (this.onDisposeCallbacks_) {\n    while (this.onDisposeCallbacks_.length) {\n      this.onDisposeCallbacks_.shift()();\n    }\n  }\n};\n\n\n/**\n * Returns True if we can verify the object is disposed.\n * Calls `isDisposed` on the argument if it supports it.  If obj\n * is not an object with an isDisposed() method, return false.\n * @param {*} obj The object to investigate.\n * @return {boolean} True if we can verify the object is disposed.\n */\ngoog.Disposable.isDisposed = function(obj) {\n  if (obj && typeof obj.isDisposed == 'function') {\n    return obj.isDisposed();\n  }\n  return false;\n};\n\n\n/**\n * Calls `dispose` on the argument if it supports it. If obj is not an\n *     object with a dispose() method, this is a no-op.\n * @param {*} obj The object to dispose of.\n */\ngoog.dispose = function(obj) {\n  if (obj && typeof obj.dispose == 'function') {\n    obj.dispose();\n  }\n};\n\n\n/**\n * Calls `dispose` on each member of the list that supports it. (If the\n * member is an ArrayLike, then `goog.disposeAll()` will be called\n * recursively on each of its members.) If the member is not an object with a\n * `dispose()` method, then it is ignored.\n * @param {...*} var_args The list.\n */\ngoog.disposeAll = function(var_args) {\n  for (var i = 0, len = arguments.length; i < len; ++i) {\n    var disposable = arguments[i];\n    if (goog.isArrayLike(disposable)) {\n      goog.disposeAll.apply(null, disposable);\n    } else {\n      goog.dispose(disposable);\n    }\n  }\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Utilities for manipulating arrays.\n */\n\n\ngoog.provide('goog.array');\n\ngoog.require('goog.asserts');\n\n\n/**\n * @define {boolean} NATIVE_ARRAY_PROTOTYPES indicates whether the code should\n * rely on Array.prototype functions, if available.\n *\n * The Array.prototype functions can be defined by external libraries like\n * Prototype and setting this flag to false forces closure to use its own\n * goog.array implementation.\n *\n * If your javascript can be loaded by a third party site and you are wary about\n * relying on the prototype functions, specify\n * \"--define goog.NATIVE_ARRAY_PROTOTYPES=false\" to the JSCompiler.\n *\n * Setting goog.TRUSTED_SITE to false will automatically set\n * NATIVE_ARRAY_PROTOTYPES to false.\n */\ngoog.NATIVE_ARRAY_PROTOTYPES =\n    goog.define('goog.NATIVE_ARRAY_PROTOTYPES', goog.TRUSTED_SITE);\n\n\n/**\n * @define {boolean} If true, JSCompiler will use the native implementation of\n * array functions where appropriate (e.g., `Array#filter`) and remove the\n * unused pure JS implementation.\n */\ngoog.array.ASSUME_NATIVE_FUNCTIONS = goog.define(\n    'goog.array.ASSUME_NATIVE_FUNCTIONS', goog.FEATURESET_YEAR > 2012);\n\n\n/**\n * Returns the last element in an array without removing it.\n * Same as goog.array.last.\n * @param {IArrayLike<T>|string} array The array.\n * @return {T} Last item in array.\n * @template T\n */\ngoog.array.peek = function(array) {\n  return array[array.length - 1];\n};\n\n\n/**\n * Returns the last element in an array without removing it.\n * Same as goog.array.peek.\n * @param {IArrayLike<T>|string} array The array.\n * @return {T} Last item in array.\n * @template T\n */\ngoog.array.last = goog.array.peek;\n\n// NOTE(arv): Since most of the array functions are generic it allows you to\n// pass an array-like object. Strings have a length and are considered array-\n// like. However, the 'in' operator does not work on strings so we cannot just\n// use the array path even if the browser supports indexing into strings. We\n// therefore end up splitting the string.\n\n\n/**\n * Returns the index of the first element of an array with a specified value, or\n * -1 if the element is not present in the array.\n *\n * See {@link http://tinyurl.com/developer-mozilla-org-array-indexof}\n *\n * @param {IArrayLike<T>|string} arr The array to be searched.\n * @param {T} obj The object for which we are searching.\n * @param {number=} opt_fromIndex The index at which to start the search. If\n *     omitted the search starts at index 0.\n * @return {number} The index of the first matching array element.\n * @template T\n */\ngoog.array.indexOf = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.indexOf) ?\n    function(arr, obj, opt_fromIndex) {\n      goog.asserts.assert(arr.length != null);\n\n      return Array.prototype.indexOf.call(arr, obj, opt_fromIndex);\n    } :\n    function(arr, obj, opt_fromIndex) {\n      var fromIndex = opt_fromIndex == null ?\n          0 :\n          (opt_fromIndex < 0 ? Math.max(0, arr.length + opt_fromIndex) :\n                               opt_fromIndex);\n\n      if (typeof arr === 'string') {\n        // Array.prototype.indexOf uses === so only strings should be found.\n        if (typeof obj !== 'string' || obj.length != 1) {\n          return -1;\n        }\n        return arr.indexOf(obj, fromIndex);\n      }\n\n      for (var i = fromIndex; i < arr.length; i++) {\n        if (i in arr && arr[i] === obj) return i;\n      }\n      return -1;\n    };\n\n\n/**\n * Returns the index of the last element of an array with a specified value, or\n * -1 if the element is not present in the array.\n *\n * See {@link http://tinyurl.com/developer-mozilla-org-array-lastindexof}\n *\n * @param {!IArrayLike<T>|string} arr The array to be searched.\n * @param {T} obj The object for which we are searching.\n * @param {?number=} opt_fromIndex The index at which to start the search. If\n *     omitted the search starts at the end of the array.\n * @return {number} The index of the last matching array element.\n * @template T\n */\ngoog.array.lastIndexOf = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.lastIndexOf) ?\n    function(arr, obj, opt_fromIndex) {\n      goog.asserts.assert(arr.length != null);\n\n      // Firefox treats undefined and null as 0 in the fromIndex argument which\n      // leads it to always return -1\n      var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;\n      return Array.prototype.lastIndexOf.call(arr, obj, fromIndex);\n    } :\n    function(arr, obj, opt_fromIndex) {\n      var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;\n\n      if (fromIndex < 0) {\n        fromIndex = Math.max(0, arr.length + fromIndex);\n      }\n\n      if (typeof arr === 'string') {\n        // Array.prototype.lastIndexOf uses === so only strings should be found.\n        if (typeof obj !== 'string' || obj.length != 1) {\n          return -1;\n        }\n        return arr.lastIndexOf(obj, fromIndex);\n      }\n\n      for (var i = fromIndex; i >= 0; i--) {\n        if (i in arr && arr[i] === obj) return i;\n      }\n      return -1;\n    };\n\n\n/**\n * Calls a function for each element in an array. Skips holes in the array.\n * See {@link http://tinyurl.com/developer-mozilla-org-array-foreach}\n *\n * @param {IArrayLike<T>|string} arr Array or array like object over\n *     which to iterate.\n * @param {?function(this: S, T, number, ?): ?} f The function to call for every\n *     element. This function takes 3 arguments (the element, the index and the\n *     array). The return value is ignored.\n * @param {S=} opt_obj The object to be used as the value of 'this' within f.\n * @template T,S\n */\ngoog.array.forEach = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.forEach) ?\n    function(arr, f, opt_obj) {\n      goog.asserts.assert(arr.length != null);\n\n      Array.prototype.forEach.call(arr, f, opt_obj);\n    } :\n    function(arr, f, opt_obj) {\n      var l = arr.length;  // must be fixed during loop... see docs\n      var arr2 = (typeof arr === 'string') ? arr.split('') : arr;\n      for (var i = 0; i < l; i++) {\n        if (i in arr2) {\n          f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);\n        }\n      }\n    };\n\n\n/**\n * Calls a function for each element in an array, starting from the last\n * element rather than the first.\n *\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this: S, T, number, ?): ?} f The function to call for every\n *     element. This function\n *     takes 3 arguments (the element, the index and the array). The return\n *     value is ignored.\n * @param {S=} opt_obj The object to be used as the value of 'this'\n *     within f.\n * @template T,S\n */\ngoog.array.forEachRight = function(arr, f, opt_obj) {\n  var l = arr.length;  // must be fixed during loop... see docs\n  var arr2 = (typeof arr === 'string') ? arr.split('') : arr;\n  for (var i = l - 1; i >= 0; --i) {\n    if (i in arr2) {\n      f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);\n    }\n  }\n};\n\n\n/**\n * Calls a function for each element in an array, and if the function returns\n * true adds the element to a new array.\n *\n * See {@link http://tinyurl.com/developer-mozilla-org-array-filter}\n *\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?):boolean} f The function to call for\n *     every element. This function\n *     takes 3 arguments (the element, the index and the array) and must\n *     return a Boolean. If the return value is true the element is added to the\n *     result array. If it is false the element is not included.\n * @param {S=} opt_obj The object to be used as the value of 'this'\n *     within f.\n * @return {!Array<T>} a new array in which only elements that passed the test\n *     are present.\n * @template T,S\n */\ngoog.array.filter = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.filter) ?\n    function(arr, f, opt_obj) {\n      goog.asserts.assert(arr.length != null);\n\n      return Array.prototype.filter.call(arr, f, opt_obj);\n    } :\n    function(arr, f, opt_obj) {\n      var l = arr.length;  // must be fixed during loop... see docs\n      var res = [];\n      var resLength = 0;\n      var arr2 = (typeof arr === 'string') ? arr.split('') : arr;\n      for (var i = 0; i < l; i++) {\n        if (i in arr2) {\n          var val = arr2[i];  // in case f mutates arr2\n          if (f.call(/** @type {?} */ (opt_obj), val, i, arr)) {\n            res[resLength++] = val;\n          }\n        }\n      }\n      return res;\n    };\n\n\n/**\n * Calls a function for each element in an array and inserts the result into a\n * new array.\n *\n * See {@link http://tinyurl.com/developer-mozilla-org-array-map}\n *\n * @param {IArrayLike<VALUE>|string} arr Array or array like object\n *     over which to iterate.\n * @param {function(this:THIS, VALUE, number, ?): RESULT} f The function to call\n *     for every element. This function takes 3 arguments (the element,\n *     the index and the array) and should return something. The result will be\n *     inserted into a new array.\n * @param {THIS=} opt_obj The object to be used as the value of 'this' within f.\n * @return {!Array<RESULT>} a new array with the results from f.\n * @template THIS, VALUE, RESULT\n */\ngoog.array.map = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.map) ?\n    function(arr, f, opt_obj) {\n      goog.asserts.assert(arr.length != null);\n\n      return Array.prototype.map.call(arr, f, opt_obj);\n    } :\n    function(arr, f, opt_obj) {\n      var l = arr.length;  // must be fixed during loop... see docs\n      var res = new Array(l);\n      var arr2 = (typeof arr === 'string') ? arr.split('') : arr;\n      for (var i = 0; i < l; i++) {\n        if (i in arr2) {\n          res[i] = f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);\n        }\n      }\n      return res;\n    };\n\n\n/**\n * Passes every element of an array into a function and accumulates the result.\n *\n * See {@link http://tinyurl.com/developer-mozilla-org-array-reduce}\n *\n * For example:\n * var a = [1, 2, 3, 4];\n * goog.array.reduce(a, function(r, v, i, arr) {return r + v;}, 0);\n * returns 10\n *\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {function(this:S, R, T, number, ?) : R} f The function to call for\n *     every element. This function\n *     takes 4 arguments (the function's previous result or the initial value,\n *     the value of the current array element, the current array index, and the\n *     array itself)\n *     function(previousValue, currentValue, index, array).\n * @param {?} val The initial value to pass into the function on the first call.\n * @param {S=} opt_obj  The object to be used as the value of 'this'\n *     within f.\n * @return {R} Result of evaluating f repeatedly across the values of the array.\n * @template T,S,R\n */\ngoog.array.reduce = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.reduce) ?\n    function(arr, f, val, opt_obj) {\n      goog.asserts.assert(arr.length != null);\n      if (opt_obj) {\n        f = goog.bind(f, opt_obj);\n      }\n      return Array.prototype.reduce.call(arr, f, val);\n    } :\n    function(arr, f, val, opt_obj) {\n      var rval = val;\n      goog.array.forEach(arr, function(val, index) {\n        rval = f.call(/** @type {?} */ (opt_obj), rval, val, index, arr);\n      });\n      return rval;\n    };\n\n\n/**\n * Passes every element of an array into a function and accumulates the result,\n * starting from the last element and working towards the first.\n *\n * See {@link http://tinyurl.com/developer-mozilla-org-array-reduceright}\n *\n * For example:\n * var a = ['a', 'b', 'c'];\n * goog.array.reduceRight(a, function(r, v, i, arr) {return r + v;}, '');\n * returns 'cba'\n *\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, R, T, number, ?) : R} f The function to call for\n *     every element. This function\n *     takes 4 arguments (the function's previous result or the initial value,\n *     the value of the current array element, the current array index, and the\n *     array itself)\n *     function(previousValue, currentValue, index, array).\n * @param {?} val The initial value to pass into the function on the first call.\n * @param {S=} opt_obj The object to be used as the value of 'this'\n *     within f.\n * @return {R} Object returned as a result of evaluating f repeatedly across the\n *     values of the array.\n * @template T,S,R\n */\ngoog.array.reduceRight = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.reduceRight) ?\n    function(arr, f, val, opt_obj) {\n      goog.asserts.assert(arr.length != null);\n      goog.asserts.assert(f != null);\n      if (opt_obj) {\n        f = goog.bind(f, opt_obj);\n      }\n      return Array.prototype.reduceRight.call(arr, f, val);\n    } :\n    function(arr, f, val, opt_obj) {\n      var rval = val;\n      goog.array.forEachRight(arr, function(val, index) {\n        rval = f.call(/** @type {?} */ (opt_obj), rval, val, index, arr);\n      });\n      return rval;\n    };\n\n\n/**\n * Calls f for each element of an array. If any call returns true, some()\n * returns true (without checking the remaining elements). If all calls\n * return false, some() returns false.\n *\n * See {@link http://tinyurl.com/developer-mozilla-org-array-some}\n *\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call for\n *     for every element. This function takes 3 arguments (the element, the\n *     index and the array) and should return a boolean.\n * @param {S=} opt_obj  The object to be used as the value of 'this'\n *     within f.\n * @return {boolean} true if any element passes the test.\n * @template T,S\n */\ngoog.array.some = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.some) ?\n    function(arr, f, opt_obj) {\n      goog.asserts.assert(arr.length != null);\n\n      return Array.prototype.some.call(arr, f, opt_obj);\n    } :\n    function(arr, f, opt_obj) {\n      var l = arr.length;  // must be fixed during loop... see docs\n      var arr2 = (typeof arr === 'string') ? arr.split('') : arr;\n      for (var i = 0; i < l; i++) {\n        if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {\n          return true;\n        }\n      }\n      return false;\n    };\n\n\n/**\n * Call f for each element of an array. If all calls return true, every()\n * returns true. If any call returns false, every() returns false and\n * does not continue to check the remaining elements.\n *\n * See {@link http://tinyurl.com/developer-mozilla-org-array-every}\n *\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call for\n *     for every element. This function takes 3 arguments (the element, the\n *     index and the array) and should return a boolean.\n * @param {S=} opt_obj The object to be used as the value of 'this'\n *     within f.\n * @return {boolean} false if any element fails the test.\n * @template T,S\n */\ngoog.array.every = goog.NATIVE_ARRAY_PROTOTYPES &&\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.every) ?\n    function(arr, f, opt_obj) {\n      goog.asserts.assert(arr.length != null);\n\n      return Array.prototype.every.call(arr, f, opt_obj);\n    } :\n    function(arr, f, opt_obj) {\n      var l = arr.length;  // must be fixed during loop... see docs\n      var arr2 = (typeof arr === 'string') ? arr.split('') : arr;\n      for (var i = 0; i < l; i++) {\n        if (i in arr2 && !f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {\n          return false;\n        }\n      }\n      return true;\n    };\n\n\n/**\n * Counts the array elements that fulfill the predicate, i.e. for which the\n * callback function returns true. Skips holes in the array.\n *\n * @param {!IArrayLike<T>|string} arr Array or array like object\n *     over which to iterate.\n * @param {function(this: S, T, number, ?): boolean} f The function to call for\n *     every element. Takes 3 arguments (the element, the index and the array).\n * @param {S=} opt_obj The object to be used as the value of 'this' within f.\n * @return {number} The number of the matching elements.\n * @template T,S\n */\ngoog.array.count = function(arr, f, opt_obj) {\n  var count = 0;\n  goog.array.forEach(arr, function(element, index, arr) {\n    if (f.call(/** @type {?} */ (opt_obj), element, index, arr)) {\n      ++count;\n    }\n  }, opt_obj);\n  return count;\n};\n\n\n/**\n * Search an array for the first element that satisfies a given condition and\n * return that element.\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\n *     for every element. This function takes 3 arguments (the element, the\n *     index and the array) and should return a boolean.\n * @param {S=} opt_obj An optional \"this\" context for the function.\n * @return {T|null} The first array element that passes the test, or null if no\n *     element is found.\n * @template T,S\n */\ngoog.array.find = function(arr, f, opt_obj) {\n  var i = goog.array.findIndex(arr, f, opt_obj);\n  return i < 0 ? null : typeof arr === 'string' ? arr.charAt(i) : arr[i];\n};\n\n\n/**\n * Search an array for the first element that satisfies a given condition and\n * return its index.\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call for\n *     every element. This function\n *     takes 3 arguments (the element, the index and the array) and should\n *     return a boolean.\n * @param {S=} opt_obj An optional \"this\" context for the function.\n * @return {number} The index of the first array element that passes the test,\n *     or -1 if no element is found.\n * @template T,S\n */\ngoog.array.findIndex = function(arr, f, opt_obj) {\n  var l = arr.length;  // must be fixed during loop... see docs\n  var arr2 = (typeof arr === 'string') ? arr.split('') : arr;\n  for (var i = 0; i < l; i++) {\n    if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {\n      return i;\n    }\n  }\n  return -1;\n};\n\n\n/**\n * Search an array (in reverse order) for the last element that satisfies a\n * given condition and return that element.\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\n *     for every element. This function\n *     takes 3 arguments (the element, the index and the array) and should\n *     return a boolean.\n * @param {S=} opt_obj An optional \"this\" context for the function.\n * @return {T|null} The last array element that passes the test, or null if no\n *     element is found.\n * @template T,S\n */\ngoog.array.findRight = function(arr, f, opt_obj) {\n  var i = goog.array.findIndexRight(arr, f, opt_obj);\n  return i < 0 ? null : typeof arr === 'string' ? arr.charAt(i) : arr[i];\n};\n\n\n/**\n * Search an array (in reverse order) for the last element that satisfies a\n * given condition and return its index.\n * @param {IArrayLike<T>|string} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\n *     for every element. This function\n *     takes 3 arguments (the element, the index and the array) and should\n *     return a boolean.\n * @param {S=} opt_obj An optional \"this\" context for the function.\n * @return {number} The index of the last array element that passes the test,\n *     or -1 if no element is found.\n * @template T,S\n */\ngoog.array.findIndexRight = function(arr, f, opt_obj) {\n  var l = arr.length;  // must be fixed during loop... see docs\n  var arr2 = (typeof arr === 'string') ? arr.split('') : arr;\n  for (var i = l - 1; i >= 0; i--) {\n    if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {\n      return i;\n    }\n  }\n  return -1;\n};\n\n\n/**\n * Whether the array contains the given object.\n * @param {IArrayLike<?>|string} arr The array to test for the presence of the\n *     element.\n * @param {*} obj The object for which to test.\n * @return {boolean} true if obj is present.\n */\ngoog.array.contains = function(arr, obj) {\n  return goog.array.indexOf(arr, obj) >= 0;\n};\n\n\n/**\n * Whether the array is empty.\n * @param {IArrayLike<?>|string} arr The array to test.\n * @return {boolean} true if empty.\n */\ngoog.array.isEmpty = function(arr) {\n  return arr.length == 0;\n};\n\n\n/**\n * Clears the array.\n * @param {IArrayLike<?>} arr Array or array like object to clear.\n */\ngoog.array.clear = function(arr) {\n  // For non real arrays we don't have the magic length so we delete the\n  // indices.\n  if (!Array.isArray(arr)) {\n    for (var i = arr.length - 1; i >= 0; i--) {\n      delete arr[i];\n    }\n  }\n  arr.length = 0;\n};\n\n\n/**\n * Pushes an item into an array, if it's not already in the array.\n * @param {Array<T>} arr Array into which to insert the item.\n * @param {T} obj Value to add.\n * @template T\n */\ngoog.array.insert = function(arr, obj) {\n  if (!goog.array.contains(arr, obj)) {\n    arr.push(obj);\n  }\n};\n\n\n/**\n * Inserts an object at the given index of the array.\n * @param {IArrayLike<?>} arr The array to modify.\n * @param {*} obj The object to insert.\n * @param {number=} opt_i The index at which to insert the object. If omitted,\n *      treated as 0. A negative index is counted from the end of the array.\n */\ngoog.array.insertAt = function(arr, obj, opt_i) {\n  goog.array.splice(arr, opt_i, 0, obj);\n};\n\n\n/**\n * Inserts at the given index of the array, all elements of another array.\n * @param {IArrayLike<?>} arr The array to modify.\n * @param {IArrayLike<?>} elementsToAdd The array of elements to add.\n * @param {number=} opt_i The index at which to insert the object. If omitted,\n *      treated as 0. A negative index is counted from the end of the array.\n */\ngoog.array.insertArrayAt = function(arr, elementsToAdd, opt_i) {\n  goog.partial(goog.array.splice, arr, opt_i, 0).apply(null, elementsToAdd);\n};\n\n\n/**\n * Inserts an object into an array before a specified object.\n * @param {Array<T>} arr The array to modify.\n * @param {T} obj The object to insert.\n * @param {T=} opt_obj2 The object before which obj should be inserted. If obj2\n *     is omitted or not found, obj is inserted at the end of the array.\n * @template T\n */\ngoog.array.insertBefore = function(arr, obj, opt_obj2) {\n  var i;\n  if (arguments.length == 2 || (i = goog.array.indexOf(arr, opt_obj2)) < 0) {\n    arr.push(obj);\n  } else {\n    goog.array.insertAt(arr, obj, i);\n  }\n};\n\n\n/**\n * Removes the first occurrence of a particular value from an array.\n * @param {IArrayLike<T>} arr Array from which to remove\n *     value.\n * @param {T} obj Object to remove.\n * @return {boolean} True if an element was removed.\n * @template T\n */\ngoog.array.remove = function(arr, obj) {\n  var i = goog.array.indexOf(arr, obj);\n  var rv;\n  if ((rv = i >= 0)) {\n    goog.array.removeAt(arr, i);\n  }\n  return rv;\n};\n\n\n/**\n * Removes the last occurrence of a particular value from an array.\n * @param {!IArrayLike<T>} arr Array from which to remove value.\n * @param {T} obj Object to remove.\n * @return {boolean} True if an element was removed.\n * @template T\n */\ngoog.array.removeLast = function(arr, obj) {\n  var i = goog.array.lastIndexOf(arr, obj);\n  if (i >= 0) {\n    goog.array.removeAt(arr, i);\n    return true;\n  }\n  return false;\n};\n\n\n/**\n * Removes from an array the element at index i\n * @param {IArrayLike<?>} arr Array or array like object from which to\n *     remove value.\n * @param {number} i The index to remove.\n * @return {boolean} True if an element was removed.\n */\ngoog.array.removeAt = function(arr, i) {\n  goog.asserts.assert(arr.length != null);\n\n  // use generic form of splice\n  // splice returns the removed items and if successful the length of that\n  // will be 1\n  return Array.prototype.splice.call(arr, i, 1).length == 1;\n};\n\n\n/**\n * Removes the first value that satisfies the given condition.\n * @param {IArrayLike<T>} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\n *     for every element. This function\n *     takes 3 arguments (the element, the index and the array) and should\n *     return a boolean.\n * @param {S=} opt_obj An optional \"this\" context for the function.\n * @return {boolean} True if an element was removed.\n * @template T,S\n */\ngoog.array.removeIf = function(arr, f, opt_obj) {\n  var i = goog.array.findIndex(arr, f, opt_obj);\n  if (i >= 0) {\n    goog.array.removeAt(arr, i);\n    return true;\n  }\n  return false;\n};\n\n\n/**\n * Removes all values that satisfy the given condition.\n * @param {IArrayLike<T>} arr Array or array\n *     like object over which to iterate.\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\n *     for every element. This function\n *     takes 3 arguments (the element, the index and the array) and should\n *     return a boolean.\n * @param {S=} opt_obj An optional \"this\" context for the function.\n * @return {number} The number of items removed\n * @template T,S\n */\ngoog.array.removeAllIf = function(arr, f, opt_obj) {\n  var removedCount = 0;\n  goog.array.forEachRight(arr, function(val, index) {\n    if (f.call(/** @type {?} */ (opt_obj), val, index, arr)) {\n      if (goog.array.removeAt(arr, index)) {\n        removedCount++;\n      }\n    }\n  });\n  return removedCount;\n};\n\n\n/**\n * Returns a new array that is the result of joining the arguments.  If arrays\n * are passed then their items are added, however, if non-arrays are passed they\n * will be added to the return array as is.\n *\n * Note that ArrayLike objects will be added as is, rather than having their\n * items added.\n *\n * goog.array.concat([1, 2], [3, 4]) -> [1, 2, 3, 4]\n * goog.array.concat(0, [1, 2]) -> [0, 1, 2]\n * goog.array.concat([1, 2], null) -> [1, 2, null]\n *\n * There is bug in all current versions of IE (6, 7 and 8) where arrays created\n * in an iframe become corrupted soon (not immediately) after the iframe is\n * destroyed. This is common if loading data via goog.net.IframeIo, for example.\n * This corruption only affects the concat method which will start throwing\n * Catastrophic Errors (#-2147418113).\n *\n * See http://endoflow.com/scratch/corrupted-arrays.html for a test case.\n *\n * Internally goog.array should use this, so that all methods will continue to\n * work on these broken array objects.\n *\n * @param {...*} var_args Items to concatenate.  Arrays will have each item\n *     added, while primitives and objects will be added as is.\n * @return {!Array<?>} The new resultant array.\n */\ngoog.array.concat = function(var_args) {\n  return Array.prototype.concat.apply([], arguments);\n};\n\n\n/**\n * Returns a new array that contains the contents of all the arrays passed.\n * @param {...!Array<T>} var_args\n * @return {!Array<T>}\n * @template T\n */\ngoog.array.join = function(var_args) {\n  return Array.prototype.concat.apply([], arguments);\n};\n\n\n/**\n * Converts an object to an array.\n * @param {IArrayLike<T>|string} object  The object to convert to an\n *     array.\n * @return {!Array<T>} The object converted into an array. If object has a\n *     length property, every property indexed with a non-negative number\n *     less than length will be included in the result. If object does not\n *     have a length property, an empty array will be returned.\n * @template T\n */\ngoog.array.toArray = function(object) {\n  var length = object.length;\n\n  // If length is not a number the following is false. This case is kept for\n  // backwards compatibility since there are callers that pass objects that are\n  // not array like.\n  if (length > 0) {\n    var rv = new Array(length);\n    for (var i = 0; i < length; i++) {\n      rv[i] = object[i];\n    }\n    return rv;\n  }\n  return [];\n};\n\n\n/**\n * Does a shallow copy of an array.\n * @param {IArrayLike<T>|string} arr  Array or array-like object to\n *     clone.\n * @return {!Array<T>} Clone of the input array.\n * @template T\n */\ngoog.array.clone = goog.array.toArray;\n\n\n/**\n * Extends an array with another array, element, or \"array like\" object.\n * This function operates 'in-place', it does not create a new Array.\n *\n * Example:\n * var a = [];\n * goog.array.extend(a, [0, 1]);\n * a; // [0, 1]\n * goog.array.extend(a, 2);\n * a; // [0, 1, 2]\n *\n * @param {Array<VALUE>} arr1  The array to modify.\n * @param {...(IArrayLike<VALUE>|VALUE)} var_args The elements or arrays of\n *     elements to add to arr1.\n * @template VALUE\n */\ngoog.array.extend = function(arr1, var_args) {\n  for (var i = 1; i < arguments.length; i++) {\n    var arr2 = arguments[i];\n    if (goog.isArrayLike(arr2)) {\n      var len1 = arr1.length || 0;\n      var len2 = arr2.length || 0;\n      arr1.length = len1 + len2;\n      for (var j = 0; j < len2; j++) {\n        arr1[len1 + j] = arr2[j];\n      }\n    } else {\n      arr1.push(arr2);\n    }\n  }\n};\n\n\n/**\n * Adds or removes elements from an array. This is a generic version of Array\n * splice. This means that it might work on other objects similar to arrays,\n * such as the arguments object.\n *\n * @param {IArrayLike<T>} arr The array to modify.\n * @param {number|undefined} index The index at which to start changing the\n *     array. If not defined, treated as 0.\n * @param {number} howMany How many elements to remove (0 means no removal. A\n *     value below 0 is treated as zero and so is any other non number. Numbers\n *     are floored).\n * @param {...T} var_args Optional, additional elements to insert into the\n *     array.\n * @return {!Array<T>} the removed elements.\n * @template T\n */\ngoog.array.splice = function(arr, index, howMany, var_args) {\n  goog.asserts.assert(arr.length != null);\n\n  return Array.prototype.splice.apply(arr, goog.array.slice(arguments, 1));\n};\n\n\n/**\n * Returns a new array from a segment of an array. This is a generic version of\n * Array slice. This means that it might work on other objects similar to\n * arrays, such as the arguments object.\n *\n * @param {IArrayLike<T>|string} arr The array from\n * which to copy a segment.\n * @param {number} start The index of the first element to copy.\n * @param {number=} opt_end The index after the last element to copy.\n * @return {!Array<T>} A new array containing the specified segment of the\n *     original array.\n * @template T\n */\ngoog.array.slice = function(arr, start, opt_end) {\n  goog.asserts.assert(arr.length != null);\n\n  // passing 1 arg to slice is not the same as passing 2 where the second is\n  // null or undefined (in that case the second argument is treated as 0).\n  // we could use slice on the arguments object and then use apply instead of\n  // testing the length\n  if (arguments.length <= 2) {\n    return Array.prototype.slice.call(arr, start);\n  } else {\n    return Array.prototype.slice.call(arr, start, opt_end);\n  }\n};\n\n\n/**\n * Removes all duplicates from an array (retaining only the first\n * occurrence of each array element).  This function modifies the\n * array in place and doesn't change the order of the non-duplicate items.\n *\n * For objects, duplicates are identified as having the same unique ID as\n * defined by {@link goog.getUid}.\n *\n * Alternatively you can specify a custom hash function that returns a unique\n * value for each item in the array it should consider unique.\n *\n * Runtime: N,\n * Worstcase space: 2N (no dupes)\n *\n * @param {IArrayLike<T>} arr The array from which to remove\n *     duplicates.\n * @param {Array=} opt_rv An optional array in which to return the results,\n *     instead of performing the removal inplace.  If specified, the original\n *     array will remain unchanged.\n * @param {function(T):string=} opt_hashFn An optional function to use to\n *     apply to every item in the array. This function should return a unique\n *     value for each item in the array it should consider unique.\n * @template T\n */\ngoog.array.removeDuplicates = function(arr, opt_rv, opt_hashFn) {\n  var returnArray = opt_rv || arr;\n  var defaultHashFn = function(item) {\n    // Prefix each type with a single character representing the type to\n    // prevent conflicting keys (e.g. true and 'true').\n    return goog.isObject(item) ? 'o' + goog.getUid(item) :\n                                 (typeof item).charAt(0) + item;\n  };\n  var hashFn = opt_hashFn || defaultHashFn;\n\n  var seen = {}, cursorInsert = 0, cursorRead = 0;\n  while (cursorRead < arr.length) {\n    var current = arr[cursorRead++];\n    var key = hashFn(current);\n    if (!Object.prototype.hasOwnProperty.call(seen, key)) {\n      seen[key] = true;\n      returnArray[cursorInsert++] = current;\n    }\n  }\n  returnArray.length = cursorInsert;\n};\n\n\n/**\n * Searches the specified array for the specified target using the binary\n * search algorithm.  If no opt_compareFn is specified, elements are compared\n * using <code>goog.array.defaultCompare</code>, which compares the elements\n * using the built in < and > operators.  This will produce the expected\n * behavior for homogeneous arrays of String(s) and Number(s). The array\n * specified <b>must</b> be sorted in ascending order (as defined by the\n * comparison function).  If the array is not sorted, results are undefined.\n * If the array contains multiple instances of the specified target value, the\n * left-most instance will be found.\n *\n * Runtime: O(log n)\n *\n * @param {IArrayLike<VALUE>} arr The array to be searched.\n * @param {TARGET} target The sought value.\n * @param {function(TARGET, VALUE): number=} opt_compareFn Optional comparison\n *     function by which the array is ordered. Should take 2 arguments to\n *     compare, the target value and an element from your array, and return a\n *     negative number, zero, or a positive number depending on whether the\n *     first argument is less than, equal to, or greater than the second.\n * @return {number} Lowest index of the target value if found, otherwise\n *     (-(insertion point) - 1). The insertion point is where the value should\n *     be inserted into arr to preserve the sorted property.  Return value >= 0\n *     iff target is found.\n * @template TARGET, VALUE\n */\ngoog.array.binarySearch = function(arr, target, opt_compareFn) {\n  return goog.array.binarySearch_(\n      arr, opt_compareFn || goog.array.defaultCompare, false /* isEvaluator */,\n      target);\n};\n\n\n/**\n * Selects an index in the specified array using the binary search algorithm.\n * The evaluator receives an element and determines whether the desired index\n * is before, at, or after it.  The evaluator must be consistent (formally,\n * goog.array.map(goog.array.map(arr, evaluator, opt_obj), goog.math.sign)\n * must be monotonically non-increasing).\n *\n * Runtime: O(log n)\n *\n * @param {IArrayLike<VALUE>} arr The array to be searched.\n * @param {function(this:THIS, VALUE, number, ?): number} evaluator\n *     Evaluator function that receives 3 arguments (the element, the index and\n *     the array). Should return a negative number, zero, or a positive number\n *     depending on whether the desired index is before, at, or after the\n *     element passed to it.\n * @param {THIS=} opt_obj The object to be used as the value of 'this'\n *     within evaluator.\n * @return {number} Index of the leftmost element matched by the evaluator, if\n *     such exists; otherwise (-(insertion point) - 1). The insertion point is\n *     the index of the first element for which the evaluator returns negative,\n *     or arr.length if no such element exists. The return value is non-negative\n *     iff a match is found.\n * @template THIS, VALUE\n */\ngoog.array.binarySelect = function(arr, evaluator, opt_obj) {\n  return goog.array.binarySearch_(\n      arr, evaluator, true /* isEvaluator */, undefined /* opt_target */,\n      opt_obj);\n};\n\n\n/**\n * Implementation of a binary search algorithm which knows how to use both\n * comparison functions and evaluators. If an evaluator is provided, will call\n * the evaluator with the given optional data object, conforming to the\n * interface defined in binarySelect. Otherwise, if a comparison function is\n * provided, will call the comparison function against the given data object.\n *\n * This implementation purposefully does not use goog.bind or goog.partial for\n * performance reasons.\n *\n * Runtime: O(log n)\n *\n * @param {IArrayLike<?>} arr The array to be searched.\n * @param {function(?, ?, ?): number | function(?, ?): number} compareFn\n *     Either an evaluator or a comparison function, as defined by binarySearch\n *     and binarySelect above.\n * @param {boolean} isEvaluator Whether the function is an evaluator or a\n *     comparison function.\n * @param {?=} opt_target If the function is a comparison function, then\n *     this is the target to binary search for.\n * @param {Object=} opt_selfObj If the function is an evaluator, this is an\n *     optional this object for the evaluator.\n * @return {number} Lowest index of the target value if found, otherwise\n *     (-(insertion point) - 1). The insertion point is where the value should\n *     be inserted into arr to preserve the sorted property.  Return value >= 0\n *     iff target is found.\n * @private\n */\ngoog.array.binarySearch_ = function(\n    arr, compareFn, isEvaluator, opt_target, opt_selfObj) {\n  var left = 0;            // inclusive\n  var right = arr.length;  // exclusive\n  var found;\n  while (left < right) {\n    var middle = left + ((right - left) >>> 1);\n    var compareResult;\n    if (isEvaluator) {\n      compareResult = compareFn.call(opt_selfObj, arr[middle], middle, arr);\n    } else {\n      // NOTE(dimvar): To avoid this cast, we'd have to use function overloading\n      // for the type of binarySearch_, which the type system can't express yet.\n      compareResult = /** @type {function(?, ?): number} */ (compareFn)(\n          opt_target, arr[middle]);\n    }\n    if (compareResult > 0) {\n      left = middle + 1;\n    } else {\n      right = middle;\n      // We are looking for the lowest index so we can't return immediately.\n      found = !compareResult;\n    }\n  }\n  // left is the index if found, or the insertion point otherwise.\n  // Avoiding bitwise not operator, as that causes a loss in precision for array\n  // indexes outside the bounds of a 32-bit signed integer.  Array indexes have\n  // a maximum value of 2^32-2 https://tc39.es/ecma262/#array-index\n  return found ? left : -left - 1;\n};\n\n\n/**\n * Sorts the specified array into ascending order.  If no opt_compareFn is\n * specified, elements are compared using\n * <code>goog.array.defaultCompare</code>, which compares the elements using\n * the built in < and > operators.  This will produce the expected behavior\n * for homogeneous arrays of String(s) and Number(s), unlike the native sort,\n * but will give unpredictable results for heterogeneous lists of strings and\n * numbers with different numbers of digits.\n *\n * This sort is not guaranteed to be stable.\n *\n * Runtime: Same as <code>Array.prototype.sort</code>\n *\n * @param {Array<T>} arr The array to be sorted.\n * @param {?function(T,T):number=} opt_compareFn Optional comparison\n *     function by which the\n *     array is to be ordered. Should take 2 arguments to compare, and return a\n *     negative number, zero, or a positive number depending on whether the\n *     first argument is less than, equal to, or greater than the second.\n * @template T\n */\ngoog.array.sort = function(arr, opt_compareFn) {\n  // TODO(arv): Update type annotation since null is not accepted.\n  arr.sort(opt_compareFn || goog.array.defaultCompare);\n};\n\n\n/**\n * Sorts the specified array into ascending order in a stable way.  If no\n * opt_compareFn is specified, elements are compared using\n * <code>goog.array.defaultCompare</code>, which compares the elements using\n * the built in < and > operators.  This will produce the expected behavior\n * for homogeneous arrays of String(s) and Number(s).\n *\n * Runtime: Same as <code>Array.prototype.sort</code>, plus an additional\n * O(n) overhead of copying the array twice.\n *\n * @param {Array<T>} arr The array to be sorted.\n * @param {?function(T, T): number=} opt_compareFn Optional comparison function\n *     by which the array is to be ordered. Should take 2 arguments to compare,\n *     and return a negative number, zero, or a positive number depending on\n *     whether the first argument is less than, equal to, or greater than the\n *     second.\n * @template T\n */\ngoog.array.stableSort = function(arr, opt_compareFn) {\n  var compArr = new Array(arr.length);\n  for (var i = 0; i < arr.length; i++) {\n    compArr[i] = {index: i, value: arr[i]};\n  }\n  var valueCompareFn = opt_compareFn || goog.array.defaultCompare;\n  function stableCompareFn(obj1, obj2) {\n    return valueCompareFn(obj1.value, obj2.value) || obj1.index - obj2.index;\n  }\n  goog.array.sort(compArr, stableCompareFn);\n  for (var i = 0; i < arr.length; i++) {\n    arr[i] = compArr[i].value;\n  }\n};\n\n\n/**\n * Sort the specified array into ascending order based on item keys\n * returned by the specified key function.\n * If no opt_compareFn is specified, the keys are compared in ascending order\n * using <code>goog.array.defaultCompare</code>.\n *\n * Runtime: O(S(f(n)), where S is runtime of <code>goog.array.sort</code>\n * and f(n) is runtime of the key function.\n *\n * @param {Array<T>} arr The array to be sorted.\n * @param {function(T): K} keyFn Function taking array element and returning\n *     a key used for sorting this element.\n * @param {?function(K, K): number=} opt_compareFn Optional comparison function\n *     by which the keys are to be ordered. Should take 2 arguments to compare,\n *     and return a negative number, zero, or a positive number depending on\n *     whether the first argument is less than, equal to, or greater than the\n *     second.\n * @template T,K\n */\ngoog.array.sortByKey = function(arr, keyFn, opt_compareFn) {\n  var keyCompareFn = opt_compareFn || goog.array.defaultCompare;\n  goog.array.sort(\n      arr, function(a, b) { return keyCompareFn(keyFn(a), keyFn(b)); });\n};\n\n\n/**\n * Sorts an array of objects by the specified object key and compare\n * function. If no compare function is provided, the key values are\n * compared in ascending order using <code>goog.array.defaultCompare</code>.\n * This won't work for keys that get renamed by the compiler. So use\n * {'foo': 1, 'bar': 2} rather than {foo: 1, bar: 2}.\n * @param {Array<Object>} arr An array of objects to sort.\n * @param {string} key The object key to sort by.\n * @param {Function=} opt_compareFn The function to use to compare key\n *     values.\n */\ngoog.array.sortObjectsByKey = function(arr, key, opt_compareFn) {\n  goog.array.sortByKey(arr, function(obj) { return obj[key]; }, opt_compareFn);\n};\n\n\n/**\n * Tells if the array is sorted.\n * @param {!IArrayLike<T>} arr The array.\n * @param {?function(T,T):number=} opt_compareFn Function to compare the\n *     array elements.\n *     Should take 2 arguments to compare, and return a negative number, zero,\n *     or a positive number depending on whether the first argument is less\n *     than, equal to, or greater than the second.\n * @param {boolean=} opt_strict If true no equal elements are allowed.\n * @return {boolean} Whether the array is sorted.\n * @template T\n */\ngoog.array.isSorted = function(arr, opt_compareFn, opt_strict) {\n  var compare = opt_compareFn || goog.array.defaultCompare;\n  for (var i = 1; i < arr.length; i++) {\n    var compareResult = compare(arr[i - 1], arr[i]);\n    if (compareResult > 0 || compareResult == 0 && opt_strict) {\n      return false;\n    }\n  }\n  return true;\n};\n\n\n/**\n * Compares two arrays for equality. Two arrays are considered equal if they\n * have the same length and their corresponding elements are equal according to\n * the comparison function.\n *\n * @param {IArrayLike<?>} arr1 The first array to compare.\n * @param {IArrayLike<?>} arr2 The second array to compare.\n * @param {Function=} opt_equalsFn Optional comparison function.\n *     Should take 2 arguments to compare, and return true if the arguments\n *     are equal. Defaults to {@link goog.array.defaultCompareEquality} which\n *     compares the elements using the built-in '===' operator.\n * @return {boolean} Whether the two arrays are equal.\n */\ngoog.array.equals = function(arr1, arr2, opt_equalsFn) {\n  if (!goog.isArrayLike(arr1) || !goog.isArrayLike(arr2) ||\n      arr1.length != arr2.length) {\n    return false;\n  }\n  var l = arr1.length;\n  var equalsFn = opt_equalsFn || goog.array.defaultCompareEquality;\n  for (var i = 0; i < l; i++) {\n    if (!equalsFn(arr1[i], arr2[i])) {\n      return false;\n    }\n  }\n  return true;\n};\n\n\n/**\n * 3-way array compare function.\n * @param {!IArrayLike<VALUE>} arr1 The first array to\n *     compare.\n * @param {!IArrayLike<VALUE>} arr2 The second array to\n *     compare.\n * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison\n *     function by which the array is to be ordered. Should take 2 arguments to\n *     compare, and return a negative number, zero, or a positive number\n *     depending on whether the first argument is less than, equal to, or\n *     greater than the second.\n * @return {number} Negative number, zero, or a positive number depending on\n *     whether the first argument is less than, equal to, or greater than the\n *     second.\n * @template VALUE\n */\ngoog.array.compare3 = function(arr1, arr2, opt_compareFn) {\n  var compare = opt_compareFn || goog.array.defaultCompare;\n  var l = Math.min(arr1.length, arr2.length);\n  for (var i = 0; i < l; i++) {\n    var result = compare(arr1[i], arr2[i]);\n    if (result != 0) {\n      return result;\n    }\n  }\n  return goog.array.defaultCompare(arr1.length, arr2.length);\n};\n\n\n/**\n * Compares its two arguments for order, using the built in < and >\n * operators.\n * @param {VALUE} a The first object to be compared.\n * @param {VALUE} b The second object to be compared.\n * @return {number} A negative number, zero, or a positive number as the first\n *     argument is less than, equal to, or greater than the second,\n *     respectively.\n * @template VALUE\n */\ngoog.array.defaultCompare = function(a, b) {\n  return a > b ? 1 : a < b ? -1 : 0;\n};\n\n\n/**\n * Compares its two arguments for inverse order, using the built in < and >\n * operators.\n * @param {VALUE} a The first object to be compared.\n * @param {VALUE} b The second object to be compared.\n * @return {number} A negative number, zero, or a positive number as the first\n *     argument is greater than, equal to, or less than the second,\n *     respectively.\n * @template VALUE\n */\ngoog.array.inverseDefaultCompare = function(a, b) {\n  return -goog.array.defaultCompare(a, b);\n};\n\n\n/**\n * Compares its two arguments for equality, using the built in === operator.\n * @param {*} a The first object to compare.\n * @param {*} b The second object to compare.\n * @return {boolean} True if the two arguments are equal, false otherwise.\n */\ngoog.array.defaultCompareEquality = function(a, b) {\n  return a === b;\n};\n\n\n/**\n * Inserts a value into a sorted array. The array is not modified if the\n * value is already present.\n * @param {IArrayLike<VALUE>} array The array to modify.\n * @param {VALUE} value The object to insert.\n * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison\n *     function by which the array is ordered. Should take 2 arguments to\n *     compare, and return a negative number, zero, or a positive number\n *     depending on whether the first argument is less than, equal to, or\n *     greater than the second.\n * @return {boolean} True if an element was inserted.\n * @template VALUE\n */\ngoog.array.binaryInsert = function(array, value, opt_compareFn) {\n  var index = goog.array.binarySearch(array, value, opt_compareFn);\n  if (index < 0) {\n    goog.array.insertAt(array, value, -(index + 1));\n    return true;\n  }\n  return false;\n};\n\n\n/**\n * Removes a value from a sorted array.\n * @param {!IArrayLike<VALUE>} array The array to modify.\n * @param {VALUE} value The object to remove.\n * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison\n *     function by which the array is ordered. Should take 2 arguments to\n *     compare, and return a negative number, zero, or a positive number\n *     depending on whether the first argument is less than, equal to, or\n *     greater than the second.\n * @return {boolean} True if an element was removed.\n * @template VALUE\n */\ngoog.array.binaryRemove = function(array, value, opt_compareFn) {\n  var index = goog.array.binarySearch(array, value, opt_compareFn);\n  return (index >= 0) ? goog.array.removeAt(array, index) : false;\n};\n\n\n/**\n * Splits an array into disjoint buckets according to a splitting function.\n * @param {IArrayLike<T>} array The array.\n * @param {function(this:S, T, number, !IArrayLike<T>):?} sorter Function to\n *     call for every element.  This takes 3 arguments (the element, the index\n *     and the array) and must return a valid object key (a string, number,\n *     etc), or undefined, if that object should not be placed in a bucket.\n * @param {S=} opt_obj The object to be used as the value of 'this' within\n *     sorter.\n * @return {!Object<!Array<T>>} An object, with keys being all of the unique\n *     return values of sorter, and values being arrays containing the items for\n *     which the splitter returned that key.\n * @template T,S\n */\ngoog.array.bucket = function(array, sorter, opt_obj) {\n  var buckets = {};\n\n  for (var i = 0; i < array.length; i++) {\n    var value = array[i];\n    var key = sorter.call(/** @type {?} */ (opt_obj), value, i, array);\n    if (key !== undefined) {\n      // Push the value to the right bucket, creating it if necessary.\n      var bucket = buckets[key] || (buckets[key] = []);\n      bucket.push(value);\n    }\n  }\n\n  return buckets;\n};\n\n\n/**\n * Creates a new object built from the provided array and the key-generation\n * function.\n * @param {IArrayLike<T>} arr Array or array like object over\n *     which to iterate whose elements will be the values in the new object.\n * @param {?function(this:S, T, number, ?) : string} keyFunc The function to\n *     call for every element. This function takes 3 arguments (the element, the\n *     index and the array) and should return a string that will be used as the\n *     key for the element in the new object. If the function returns the same\n *     key for more than one element, the value for that key is\n *     implementation-defined.\n * @param {S=} opt_obj The object to be used as the value of 'this'\n *     within keyFunc.\n * @return {!Object<T>} The new object.\n * @template T,S\n */\ngoog.array.toObject = function(arr, keyFunc, opt_obj) {\n  var ret = {};\n  goog.array.forEach(arr, function(element, index) {\n    ret[keyFunc.call(/** @type {?} */ (opt_obj), element, index, arr)] =\n        element;\n  });\n  return ret;\n};\n\n\n/**\n * Creates a range of numbers in an arithmetic progression.\n *\n * Range takes 1, 2, or 3 arguments:\n * <pre>\n * range(5) is the same as range(0, 5, 1) and produces [0, 1, 2, 3, 4]\n * range(2, 5) is the same as range(2, 5, 1) and produces [2, 3, 4]\n * range(-2, -5, -1) produces [-2, -3, -4]\n * range(-2, -5, 1) produces [], since stepping by 1 wouldn't ever reach -5.\n * </pre>\n *\n * @param {number} startOrEnd The starting value of the range if an end argument\n *     is provided. Otherwise, the start value is 0, and this is the end value.\n * @param {number=} opt_end The optional end value of the range.\n * @param {number=} opt_step The step size between range values. Defaults to 1\n *     if opt_step is undefined or 0.\n * @return {!Array<number>} An array of numbers for the requested range. May be\n *     an empty array if adding the step would not converge toward the end\n *     value.\n */\ngoog.array.range = function(startOrEnd, opt_end, opt_step) {\n  var array = [];\n  var start = 0;\n  var end = startOrEnd;\n  var step = opt_step || 1;\n  if (opt_end !== undefined) {\n    start = startOrEnd;\n    end = opt_end;\n  }\n\n  if (step * (end - start) < 0) {\n    // Sign mismatch: start + step will never reach the end value.\n    return [];\n  }\n\n  if (step > 0) {\n    for (var i = start; i < end; i += step) {\n      array.push(i);\n    }\n  } else {\n    for (var i = start; i > end; i += step) {\n      array.push(i);\n    }\n  }\n  return array;\n};\n\n\n/**\n * Returns an array consisting of the given value repeated N times.\n *\n * @param {VALUE} value The value to repeat.\n * @param {number} n The repeat count.\n * @return {!Array<VALUE>} An array with the repeated value.\n * @template VALUE\n */\ngoog.array.repeat = function(value, n) {\n  var array = [];\n  for (var i = 0; i < n; i++) {\n    array[i] = value;\n  }\n  return array;\n};\n\n\n/**\n * Returns an array consisting of every argument with all arrays\n * expanded in-place recursively.\n *\n * @param {...*} var_args The values to flatten.\n * @return {!Array<?>} An array containing the flattened values.\n */\ngoog.array.flatten = function(var_args) {\n  var CHUNK_SIZE = 8192;\n\n  var result = [];\n  for (var i = 0; i < arguments.length; i++) {\n    var element = arguments[i];\n    if (Array.isArray(element)) {\n      for (var c = 0; c < element.length; c += CHUNK_SIZE) {\n        var chunk = goog.array.slice(element, c, c + CHUNK_SIZE);\n        var recurseResult = goog.array.flatten.apply(null, chunk);\n        for (var r = 0; r < recurseResult.length; r++) {\n          result.push(recurseResult[r]);\n        }\n      }\n    } else {\n      result.push(element);\n    }\n  }\n  return result;\n};\n\n\n/**\n * Rotates an array in-place. After calling this method, the element at\n * index i will be the element previously at index (i - n) %\n * array.length, for all values of i between 0 and array.length - 1,\n * inclusive.\n *\n * For example, suppose list comprises [t, a, n, k, s]. After invoking\n * rotate(array, 1) (or rotate(array, -4)), array will comprise [s, t, a, n, k].\n *\n * @param {!Array<T>} array The array to rotate.\n * @param {number} n The amount to rotate.\n * @return {!Array<T>} The array.\n * @template T\n */\ngoog.array.rotate = function(array, n) {\n  goog.asserts.assert(array.length != null);\n\n  if (array.length) {\n    n %= array.length;\n    if (n > 0) {\n      Array.prototype.unshift.apply(array, array.splice(-n, n));\n    } else if (n < 0) {\n      Array.prototype.push.apply(array, array.splice(0, -n));\n    }\n  }\n  return array;\n};\n\n\n/**\n * Moves one item of an array to a new position keeping the order of the rest\n * of the items. Example use case: keeping a list of JavaScript objects\n * synchronized with the corresponding list of DOM elements after one of the\n * elements has been dragged to a new position.\n * @param {!IArrayLike<?>} arr The array to modify.\n * @param {number} fromIndex Index of the item to move between 0 and\n *     {@code arr.length - 1}.\n * @param {number} toIndex Target index between 0 and {@code arr.length - 1}.\n */\ngoog.array.moveItem = function(arr, fromIndex, toIndex) {\n  goog.asserts.assert(fromIndex >= 0 && fromIndex < arr.length);\n  goog.asserts.assert(toIndex >= 0 && toIndex < arr.length);\n  // Remove 1 item at fromIndex.\n  var removedItems = Array.prototype.splice.call(arr, fromIndex, 1);\n  // Insert the removed item at toIndex.\n  Array.prototype.splice.call(arr, toIndex, 0, removedItems[0]);\n  // We don't use goog.array.insertAt and goog.array.removeAt, because they're\n  // significantly slower than splice.\n};\n\n\n/**\n * Creates a new array for which the element at position i is an array of the\n * ith element of the provided arrays.  The returned array will only be as long\n * as the shortest array provided; additional values are ignored.  For example,\n * the result of zipping [1, 2] and [3, 4, 5] is [[1,3], [2, 4]].\n *\n * This is similar to the zip() function in Python.  See {@link\n * http://docs.python.org/library/functions.html#zip}\n *\n * @param {...!IArrayLike<?>} var_args Arrays to be combined.\n * @return {!Array<!Array<?>>} A new array of arrays created from\n *     provided arrays.\n */\ngoog.array.zip = function(var_args) {\n  if (!arguments.length) {\n    return [];\n  }\n  var result = [];\n  var minLen = arguments[0].length;\n  for (var i = 1; i < arguments.length; i++) {\n    if (arguments[i].length < minLen) {\n      minLen = arguments[i].length;\n    }\n  }\n  for (var i = 0; i < minLen; i++) {\n    var value = [];\n    for (var j = 0; j < arguments.length; j++) {\n      value.push(arguments[j][i]);\n    }\n    result.push(value);\n  }\n  return result;\n};\n\n\n/**\n * Shuffles the values in the specified array using the Fisher-Yates in-place\n * shuffle (also known as the Knuth Shuffle). By default, calls Math.random()\n * and so resets the state of that random number generator. Similarly, may reset\n * the state of any other specified random number generator.\n *\n * Runtime: O(n)\n *\n * @param {!Array<?>} arr The array to be shuffled.\n * @param {function():number=} opt_randFn Optional random function to use for\n *     shuffling.\n *     Takes no arguments, and returns a random number on the interval [0, 1).\n *     Defaults to Math.random() using JavaScript's built-in Math library.\n */\ngoog.array.shuffle = function(arr, opt_randFn) {\n  var randFn = opt_randFn || Math.random;\n\n  for (var i = arr.length - 1; i > 0; i--) {\n    // Choose a random array index in [0, i] (inclusive with i).\n    var j = Math.floor(randFn() * (i + 1));\n\n    var tmp = arr[i];\n    arr[i] = arr[j];\n    arr[j] = tmp;\n  }\n};\n\n\n/**\n * Returns a new array of elements from arr, based on the indexes of elements\n * provided by index_arr. For example, the result of index copying\n * ['a', 'b', 'c'] with index_arr [1,0,0,2] is ['b', 'a', 'a', 'c'].\n *\n * @param {!IArrayLike<T>} arr The array to get a indexed copy from.\n * @param {!IArrayLike<number>} index_arr An array of indexes to get from arr.\n * @return {!Array<T>} A new array of elements from arr in index_arr order.\n * @template T\n */\ngoog.array.copyByIndex = function(arr, index_arr) {\n  var result = [];\n  goog.array.forEach(index_arr, function(index) { result.push(arr[index]); });\n  return result;\n};\n\n\n/**\n * Maps each element of the input array into zero or more elements of the output\n * array.\n *\n * @param {!IArrayLike<VALUE>|string} arr Array or array like object\n *     over which to iterate.\n * @param {function(this:THIS, VALUE, number, ?): !Array<RESULT>} f The function\n *     to call for every element. This function takes 3 arguments (the element,\n *     the index and the array) and should return an array. The result will be\n *     used to extend a new array.\n * @param {THIS=} opt_obj The object to be used as the value of 'this' within f.\n * @return {!Array<RESULT>} a new array with the concatenation of all arrays\n *     returned from f.\n * @template THIS, VALUE, RESULT\n */\ngoog.array.concatMap = function(arr, f, opt_obj) {\n  return goog.array.concat.apply([], goog.array.map(arr, f, opt_obj));\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview String functions called from Closure packages that couldn't\n * depend on each other. Outside Closure, use goog.string function which\n * delegate to these.\n */\n\n\ngoog.provide('goog.string.internal');\n\n\n/**\n * Fast prefix-checker.\n * @param {string} str The string to check.\n * @param {string} prefix A string to look for at the start of `str`.\n * @return {boolean} True if `str` begins with `prefix`.\n * @see goog.string.startsWith\n */\ngoog.string.internal.startsWith = function(str, prefix) {\n  return str.lastIndexOf(prefix, 0) == 0;\n};\n\n\n/**\n * Fast suffix-checker.\n * @param {string} str The string to check.\n * @param {string} suffix A string to look for at the end of `str`.\n * @return {boolean} True if `str` ends with `suffix`.\n * @see goog.string.endsWith\n */\ngoog.string.internal.endsWith = function(str, suffix) {\n  const l = str.length - suffix.length;\n  return l >= 0 && str.indexOf(suffix, l) == l;\n};\n\n\n/**\n * Case-insensitive prefix-checker.\n * @param {string} str The string to check.\n * @param {string} prefix  A string to look for at the end of `str`.\n * @return {boolean} True if `str` begins with `prefix` (ignoring\n *     case).\n * @see goog.string.caseInsensitiveStartsWith\n */\ngoog.string.internal.caseInsensitiveStartsWith = function(str, prefix) {\n  return goog.string.internal.caseInsensitiveCompare(\n             prefix, str.substr(0, prefix.length)) == 0;\n};\n\n\n/**\n * Case-insensitive suffix-checker.\n * @param {string} str The string to check.\n * @param {string} suffix A string to look for at the end of `str`.\n * @return {boolean} True if `str` ends with `suffix` (ignoring\n *     case).\n * @see goog.string.caseInsensitiveEndsWith\n */\ngoog.string.internal.caseInsensitiveEndsWith = function(str, suffix) {\n  return (\n      goog.string.internal.caseInsensitiveCompare(\n          suffix, str.substr(str.length - suffix.length, suffix.length)) == 0);\n};\n\n\n/**\n * Case-insensitive equality checker.\n * @param {string} str1 First string to check.\n * @param {string} str2 Second string to check.\n * @return {boolean} True if `str1` and `str2` are the same string,\n *     ignoring case.\n * @see goog.string.caseInsensitiveEquals\n */\ngoog.string.internal.caseInsensitiveEquals = function(str1, str2) {\n  return str1.toLowerCase() == str2.toLowerCase();\n};\n\n\n/**\n * Checks if a string is empty or contains only whitespaces.\n * @param {string} str The string to check.\n * @return {boolean} Whether `str` is empty or whitespace only.\n * @see goog.string.isEmptyOrWhitespace\n */\ngoog.string.internal.isEmptyOrWhitespace = function(str) {\n  // testing length == 0 first is actually slower in all browsers (about the\n  // same in Opera).\n  // Since IE doesn't include non-breaking-space (0xa0) in their \\s character\n  // class (as required by section 7.2 of the ECMAScript spec), we explicitly\n  // include it in the regexp to enforce consistent cross-browser behavior.\n  return /^[\\s\\xa0]*$/.test(str);\n};\n\n\n/**\n * Trims white spaces to the left and right of a string.\n * @param {string} str The string to trim.\n * @return {string} A trimmed copy of `str`.\n */\ngoog.string.internal.trim =\n    (goog.TRUSTED_SITE && String.prototype.trim) ? function(str) {\n      return str.trim();\n    } : function(str) {\n      // Since IE doesn't include non-breaking-space (0xa0) in their \\s\n      // character class (as required by section 7.2 of the ECMAScript spec),\n      // we explicitly include it in the regexp to enforce consistent\n      // cross-browser behavior.\n      // NOTE: We don't use String#replace because it might have side effects\n      // causing this function to not compile to 0 bytes.\n      return /^[\\s\\xa0]*([\\s\\S]*?)[\\s\\xa0]*$/.exec(str)[1];\n    };\n\n\n/**\n * A string comparator that ignores case.\n * -1 = str1 less than str2\n *  0 = str1 equals str2\n *  1 = str1 greater than str2\n *\n * @param {string} str1 The string to compare.\n * @param {string} str2 The string to compare `str1` to.\n * @return {number} The comparator result, as described above.\n * @see goog.string.caseInsensitiveCompare\n */\ngoog.string.internal.caseInsensitiveCompare = function(str1, str2) {\n  const test1 = String(str1).toLowerCase();\n  const test2 = String(str2).toLowerCase();\n\n  if (test1 < test2) {\n    return -1;\n  } else if (test1 == test2) {\n    return 0;\n  } else {\n    return 1;\n  }\n};\n\n\n/**\n * Converts \\n to <br>s or <br />s.\n * @param {string} str The string in which to convert newlines.\n * @param {boolean=} opt_xml Whether to use XML compatible tags.\n * @return {string} A copy of `str` with converted newlines.\n * @see goog.string.newLineToBr\n */\ngoog.string.internal.newLineToBr = function(str, opt_xml) {\n  return str.replace(/(\\r\\n|\\r|\\n)/g, opt_xml ? '<br />' : '<br>');\n};\n\n\n/**\n * Escapes double quote '\"' and single quote '\\'' characters in addition to\n * '&', '<', and '>' so that a string can be included in an HTML tag attribute\n * value within double or single quotes.\n * @param {string} str string to be escaped.\n * @param {boolean=} opt_isLikelyToContainHtmlChars\n * @return {string} An escaped copy of `str`.\n * @see goog.string.htmlEscape\n */\ngoog.string.internal.htmlEscape = function(\n    str, opt_isLikelyToContainHtmlChars) {\n  if (opt_isLikelyToContainHtmlChars) {\n    str = str.replace(goog.string.internal.AMP_RE_, '&amp;')\n              .replace(goog.string.internal.LT_RE_, '&lt;')\n              .replace(goog.string.internal.GT_RE_, '&gt;')\n              .replace(goog.string.internal.QUOT_RE_, '&quot;')\n              .replace(goog.string.internal.SINGLE_QUOTE_RE_, '&#39;')\n              .replace(goog.string.internal.NULL_RE_, '&#0;');\n    return str;\n\n  } else {\n    // quick test helps in the case when there are no chars to replace, in\n    // worst case this makes barely a difference to the time taken\n    if (!goog.string.internal.ALL_RE_.test(str)) return str;\n\n    // str.indexOf is faster than regex.test in this case\n    if (str.indexOf('&') != -1) {\n      str = str.replace(goog.string.internal.AMP_RE_, '&amp;');\n    }\n    if (str.indexOf('<') != -1) {\n      str = str.replace(goog.string.internal.LT_RE_, '&lt;');\n    }\n    if (str.indexOf('>') != -1) {\n      str = str.replace(goog.string.internal.GT_RE_, '&gt;');\n    }\n    if (str.indexOf('\"') != -1) {\n      str = str.replace(goog.string.internal.QUOT_RE_, '&quot;');\n    }\n    if (str.indexOf('\\'') != -1) {\n      str = str.replace(goog.string.internal.SINGLE_QUOTE_RE_, '&#39;');\n    }\n    if (str.indexOf('\\x00') != -1) {\n      str = str.replace(goog.string.internal.NULL_RE_, '&#0;');\n    }\n    return str;\n  }\n};\n\n\n/**\n * Regular expression that matches an ampersand, for use in escaping.\n * @const {!RegExp}\n * @private\n */\ngoog.string.internal.AMP_RE_ = /&/g;\n\n\n/**\n * Regular expression that matches a less than sign, for use in escaping.\n * @const {!RegExp}\n * @private\n */\ngoog.string.internal.LT_RE_ = /</g;\n\n\n/**\n * Regular expression that matches a greater than sign, for use in escaping.\n * @const {!RegExp}\n * @private\n */\ngoog.string.internal.GT_RE_ = />/g;\n\n\n/**\n * Regular expression that matches a double quote, for use in escaping.\n * @const {!RegExp}\n * @private\n */\ngoog.string.internal.QUOT_RE_ = /\"/g;\n\n\n/**\n * Regular expression that matches a single quote, for use in escaping.\n * @const {!RegExp}\n * @private\n */\ngoog.string.internal.SINGLE_QUOTE_RE_ = /'/g;\n\n\n/**\n * Regular expression that matches null character, for use in escaping.\n * @const {!RegExp}\n * @private\n */\ngoog.string.internal.NULL_RE_ = /\\x00/g;\n\n\n/**\n * Regular expression that matches any character that needs to be escaped.\n * @const {!RegExp}\n * @private\n */\ngoog.string.internal.ALL_RE_ = /[\\x00&<>\"']/;\n\n\n/**\n * Do escaping of whitespace to preserve spatial formatting. We use character\n * entity #160 to make it safer for xml.\n * @param {string} str The string in which to escape whitespace.\n * @param {boolean=} opt_xml Whether to use XML compatible tags.\n * @return {string} An escaped copy of `str`.\n * @see goog.string.whitespaceEscape\n */\ngoog.string.internal.whitespaceEscape = function(str, opt_xml) {\n  // This doesn't use goog.string.preserveSpaces for backwards compatibility.\n  return goog.string.internal.newLineToBr(\n      str.replace(/  /g, ' &#160;'), opt_xml);\n};\n\n\n/**\n * Determines whether a string contains a substring.\n * @param {string} str The string to search.\n * @param {string} subString The substring to search for.\n * @return {boolean} Whether `str` contains `subString`.\n * @see goog.string.contains\n */\ngoog.string.internal.contains = function(str, subString) {\n  return str.indexOf(subString) != -1;\n};\n\n\n/**\n * Determines whether a string contains a substring, ignoring case.\n * @param {string} str The string to search.\n * @param {string} subString The substring to search for.\n * @return {boolean} Whether `str` contains `subString`.\n * @see goog.string.caseInsensitiveContains\n */\ngoog.string.internal.caseInsensitiveContains = function(str, subString) {\n  return goog.string.internal.contains(\n      str.toLowerCase(), subString.toLowerCase());\n};\n\n\n/**\n * Compares two version numbers.\n *\n * @param {string|number} version1 Version of first item.\n * @param {string|number} version2 Version of second item.\n *\n * @return {number}  1 if `version1` is higher.\n *                   0 if arguments are equal.\n *                  -1 if `version2` is higher.\n * @see goog.string.compareVersions\n */\ngoog.string.internal.compareVersions = function(version1, version2) {\n  let order = 0;\n  // Trim leading and trailing whitespace and split the versions into\n  // subversions.\n  const v1Subs = goog.string.internal.trim(String(version1)).split('.');\n  const v2Subs = goog.string.internal.trim(String(version2)).split('.');\n  const subCount = Math.max(v1Subs.length, v2Subs.length);\n\n  // Iterate over the subversions, as long as they appear to be equivalent.\n  for (let subIdx = 0; order == 0 && subIdx < subCount; subIdx++) {\n    let v1Sub = v1Subs[subIdx] || '';\n    let v2Sub = v2Subs[subIdx] || '';\n\n    do {\n      // Split the subversions into pairs of numbers and qualifiers (like 'b').\n      // Two different RegExp objects are use to make it clear the code\n      // is side-effect free\n      const v1Comp = /(\\d*)(\\D*)(.*)/.exec(v1Sub) || ['', '', '', ''];\n      const v2Comp = /(\\d*)(\\D*)(.*)/.exec(v2Sub) || ['', '', '', ''];\n      // Break if there are no more matches.\n      if (v1Comp[0].length == 0 && v2Comp[0].length == 0) {\n        break;\n      }\n\n      // Parse the numeric part of the subversion. A missing number is\n      // equivalent to 0.\n      const v1CompNum = v1Comp[1].length == 0 ? 0 : parseInt(v1Comp[1], 10);\n      const v2CompNum = v2Comp[1].length == 0 ? 0 : parseInt(v2Comp[1], 10);\n\n      // Compare the subversion components. The number has the highest\n      // precedence. Next, if the numbers are equal, a subversion without any\n      // qualifier is always higher than a subversion with any qualifier. Next,\n      // the qualifiers are compared as strings.\n      order = goog.string.internal.compareElements_(v1CompNum, v2CompNum) ||\n          goog.string.internal.compareElements_(\n              v1Comp[2].length == 0, v2Comp[2].length == 0) ||\n          goog.string.internal.compareElements_(v1Comp[2], v2Comp[2]);\n      // Stop as soon as an inequality is discovered.\n\n      v1Sub = v1Comp[3];\n      v2Sub = v2Comp[3];\n    } while (order == 0);\n  }\n\n  return order;\n};\n\n\n/**\n * Compares elements of a version number.\n *\n * @param {string|number|boolean} left An element from a version number.\n * @param {string|number|boolean} right An element from a version number.\n *\n * @return {number}  1 if `left` is higher.\n *                   0 if arguments are equal.\n *                  -1 if `right` is higher.\n * @private\n */\ngoog.string.internal.compareElements_ = function(left, right) {\n  if (left < right) {\n    return -1;\n  } else if (left > right) {\n    return 1;\n  }\n  return 0;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Utilities used by goog.labs.userAgent tools. These functions\n * should not be used outside of goog.labs.userAgent.*.\n *\n */\n\ngoog.provide('goog.labs.userAgent.util');\n\ngoog.require('goog.string.internal');\n\n\n/**\n * Gets the native userAgent string from navigator if it exists.\n * If navigator or navigator.userAgent string is missing, returns an empty\n * string.\n * @return {string}\n * @private\n */\ngoog.labs.userAgent.util.getNativeUserAgentString_ = function() {\n  var navigator = goog.labs.userAgent.util.getNavigator_();\n  if (navigator) {\n    var userAgent = navigator.userAgent;\n    if (userAgent) {\n      return userAgent;\n    }\n  }\n  return '';\n};\n\n\n/**\n * Getter for the native navigator.\n * This is a separate function so it can be stubbed out in testing.\n * @return {!Navigator}\n * @private\n */\ngoog.labs.userAgent.util.getNavigator_ = function() {\n  return goog.global.navigator;\n};\n\n\n/**\n * A possible override for applications which wish to not check\n * navigator.userAgent but use a specified value for detection instead.\n * @private {string}\n */\ngoog.labs.userAgent.util.userAgent_ =\n    goog.labs.userAgent.util.getNativeUserAgentString_();\n\n\n/**\n * Applications may override browser detection on the built in\n * navigator.userAgent object by setting this string. Set to null to use the\n * browser object instead.\n * @param {?string=} opt_userAgent The User-Agent override.\n */\ngoog.labs.userAgent.util.setUserAgent = function(opt_userAgent) {\n  goog.labs.userAgent.util.userAgent_ =\n      opt_userAgent || goog.labs.userAgent.util.getNativeUserAgentString_();\n};\n\n\n/**\n * @return {string} The user agent string.\n */\ngoog.labs.userAgent.util.getUserAgent = function() {\n  return goog.labs.userAgent.util.userAgent_;\n};\n\n\n/**\n * @param {string} str\n * @return {boolean} Whether the user agent contains the given string.\n */\ngoog.labs.userAgent.util.matchUserAgent = function(str) {\n  var userAgent = goog.labs.userAgent.util.getUserAgent();\n  return goog.string.internal.contains(userAgent, str);\n};\n\n\n/**\n * @param {string} str\n * @return {boolean} Whether the user agent contains the given string, ignoring\n *     case.\n */\ngoog.labs.userAgent.util.matchUserAgentIgnoreCase = function(str) {\n  var userAgent = goog.labs.userAgent.util.getUserAgent();\n  return goog.string.internal.caseInsensitiveContains(userAgent, str);\n};\n\n\n/**\n * Parses the user agent into tuples for each section.\n * @param {string} userAgent\n * @return {!Array<!Array<string>>} Tuples of key, version, and the contents\n *     of the parenthetical.\n */\ngoog.labs.userAgent.util.extractVersionTuples = function(userAgent) {\n  // Matches each section of a user agent string.\n  // Example UA:\n  // Mozilla/5.0 (iPad; U; CPU OS 3_2_1 like Mac OS X; en-us)\n  // AppleWebKit/531.21.10 (KHTML, like Gecko) Mobile/7B405\n  // This has three version tuples: Mozilla, AppleWebKit, and Mobile.\n\n  var versionRegExp = new RegExp(\n      // Key. Note that a key may have a space.\n      // (i.e. 'Mobile Safari' in 'Mobile Safari/5.0')\n      '(\\\\w[\\\\w ]+)' +\n\n          '/' +                // slash\n          '([^\\\\s]+)' +        // version (i.e. '5.0b')\n          '\\\\s*' +             // whitespace\n          '(?:\\\\((.*?)\\\\))?',  // parenthetical info. parentheses not matched.\n      'g');\n\n  var data = [];\n  var match;\n\n  // Iterate and collect the version tuples.  Each iteration will be the\n  // next regex match.\n  while (match = versionRegExp.exec(userAgent)) {\n    data.push([\n      match[1],  // key\n      match[2],  // value\n      // || undefined as this is not undefined in IE7 and IE8\n      match[3] || undefined  // info\n    ]);\n  }\n\n  return data;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Utilities for manipulating objects/maps/hashes.\n */\n\ngoog.provide('goog.object');\n\n\n/**\n * Whether two values are not observably distinguishable. This\n * correctly detects that 0 is not the same as -0 and two NaNs are\n * practically equivalent.\n *\n * The implementation is as suggested by harmony:egal proposal.\n *\n * @param {*} v The first value to compare.\n * @param {*} v2 The second value to compare.\n * @return {boolean} Whether two values are not observably distinguishable.\n * @see http://wiki.ecmascript.org/doku.php?id=harmony:egal\n */\ngoog.object.is = function(v, v2) {\n  if (v === v2) {\n    // 0 === -0, but they are not identical.\n    // We need the cast because the compiler requires that v2 is a\n    // number (although 1/v2 works with non-number). We cast to ? to\n    // stop the compiler from type-checking this statement.\n    return v !== 0 || 1 / v === 1 / /** @type {?} */ (v2);\n  }\n\n  // NaN is non-reflexive: NaN !== NaN, although they are identical.\n  return v !== v && v2 !== v2;\n};\n\n\n/**\n * Calls a function for each element in an object/map/hash.\n *\n * @param {Object<K,V>} obj The object over which to iterate.\n * @param {function(this:T,V,?,Object<K,V>):?} f The function to call\n *     for every element. This function takes 3 arguments (the value, the\n *     key and the object) and the return value is ignored.\n * @param {T=} opt_obj This is used as the 'this' object within f.\n * @template T,K,V\n */\ngoog.object.forEach = function(obj, f, opt_obj) {\n  for (const key in obj) {\n    f.call(/** @type {?} */ (opt_obj), obj[key], key, obj);\n  }\n};\n\n\n/**\n * Calls a function for each element in an object/map/hash. If that call returns\n * true, adds the element to a new object.\n *\n * @param {Object<K,V>} obj The object over which to iterate.\n * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to call\n *     for every element. This\n *     function takes 3 arguments (the value, the key and the object)\n *     and should return a boolean. If the return value is true the\n *     element is added to the result object. If it is false the\n *     element is not included.\n * @param {T=} opt_obj This is used as the 'this' object within f.\n * @return {!Object<K,V>} a new object in which only elements that passed the\n *     test are present.\n * @template T,K,V\n */\ngoog.object.filter = function(obj, f, opt_obj) {\n  const res = {};\n  for (const key in obj) {\n    if (f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {\n      res[key] = obj[key];\n    }\n  }\n  return res;\n};\n\n\n/**\n * For every element in an object/map/hash calls a function and inserts the\n * result into a new object.\n *\n * @param {Object<K,V>} obj The object over which to iterate.\n * @param {function(this:T,V,?,Object<K,V>):R} f The function to call\n *     for every element. This function\n *     takes 3 arguments (the value, the key and the object)\n *     and should return something. The result will be inserted\n *     into a new object.\n * @param {T=} opt_obj This is used as the 'this' object within f.\n * @return {!Object<K,R>} a new object with the results from f.\n * @template T,K,V,R\n */\ngoog.object.map = function(obj, f, opt_obj) {\n  const res = {};\n  for (const key in obj) {\n    res[key] = f.call(/** @type {?} */ (opt_obj), obj[key], key, obj);\n  }\n  return res;\n};\n\n\n/**\n * Calls a function for each element in an object/map/hash. If any\n * call returns true, returns true (without checking the rest). If\n * all calls return false, returns false.\n *\n * @param {Object<K,V>} obj The object to check.\n * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to\n *     call for every element. This function\n *     takes 3 arguments (the value, the key and the object) and should\n *     return a boolean.\n * @param {T=} opt_obj This is used as the 'this' object within f.\n * @return {boolean} true if any element passes the test.\n * @template T,K,V\n */\ngoog.object.some = function(obj, f, opt_obj) {\n  for (const key in obj) {\n    if (f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {\n      return true;\n    }\n  }\n  return false;\n};\n\n\n/**\n * Calls a function for each element in an object/map/hash. If\n * all calls return true, returns true. If any call returns false, returns\n * false at this point and does not continue to check the remaining elements.\n *\n * @param {Object<K,V>} obj The object to check.\n * @param {?function(this:T,V,?,Object<K,V>):boolean} f The function to\n *     call for every element. This function\n *     takes 3 arguments (the value, the key and the object) and should\n *     return a boolean.\n * @param {T=} opt_obj This is used as the 'this' object within f.\n * @return {boolean} false if any element fails the test.\n * @template T,K,V\n */\ngoog.object.every = function(obj, f, opt_obj) {\n  for (const key in obj) {\n    if (!f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {\n      return false;\n    }\n  }\n  return true;\n};\n\n\n/**\n * Returns the number of key-value pairs in the object map.\n *\n * @param {Object} obj The object for which to get the number of key-value\n *     pairs.\n * @return {number} The number of key-value pairs in the object map.\n */\ngoog.object.getCount = function(obj) {\n  let rv = 0;\n  for (const key in obj) {\n    rv++;\n  }\n  return rv;\n};\n\n\n/**\n * Returns one key from the object map, if any exists.\n * For map literals the returned key will be the first one in most of the\n * browsers (a know exception is Konqueror).\n *\n * @param {Object} obj The object to pick a key from.\n * @return {string|undefined} The key or undefined if the object is empty.\n */\ngoog.object.getAnyKey = function(obj) {\n  for (const key in obj) {\n    return key;\n  }\n};\n\n\n/**\n * Returns one value from the object map, if any exists.\n * For map literals the returned value will be the first one in most of the\n * browsers (a know exception is Konqueror).\n *\n * @param {Object<K,V>} obj The object to pick a value from.\n * @return {V|undefined} The value or undefined if the object is empty.\n * @template K,V\n */\ngoog.object.getAnyValue = function(obj) {\n  for (const key in obj) {\n    return obj[key];\n  }\n};\n\n\n/**\n * Whether the object/hash/map contains the given object as a value.\n * An alias for goog.object.containsValue(obj, val).\n *\n * @param {Object<K,V>} obj The object in which to look for val.\n * @param {V} val The object for which to check.\n * @return {boolean} true if val is present.\n * @template K,V\n */\ngoog.object.contains = function(obj, val) {\n  return goog.object.containsValue(obj, val);\n};\n\n\n/**\n * Returns the values of the object/map/hash.\n *\n * @param {Object<K,V>} obj The object from which to get the values.\n * @return {!Array<V>} The values in the object/map/hash.\n * @template K,V\n */\ngoog.object.getValues = function(obj) {\n  const res = [];\n  let i = 0;\n  for (const key in obj) {\n    res[i++] = obj[key];\n  }\n  return res;\n};\n\n\n/**\n * Returns the keys of the object/map/hash.\n *\n * @param {Object} obj The object from which to get the keys.\n * @return {!Array<string>} Array of property keys.\n */\ngoog.object.getKeys = function(obj) {\n  const res = [];\n  let i = 0;\n  for (const key in obj) {\n    res[i++] = key;\n  }\n  return res;\n};\n\n\n/**\n * Get a value from an object multiple levels deep.  This is useful for\n * pulling values from deeply nested objects, such as JSON responses.\n * Example usage: getValueByKeys(jsonObj, 'foo', 'entries', 3)\n *\n * @param {!Object} obj An object to get the value from.  Can be array-like.\n * @param {...(string|number|!IArrayLike<number|string>)}\n *     var_args A number of keys\n *     (as strings, or numbers, for array-like objects).  Can also be\n *     specified as a single array of keys.\n * @return {*} The resulting value.  If, at any point, the value for a key\n *     in the current object is null or undefined, returns undefined.\n */\ngoog.object.getValueByKeys = function(obj, var_args) {\n  const isArrayLike = goog.isArrayLike(var_args);\n  const keys = isArrayLike ?\n      /** @type {!IArrayLike<number|string>} */ (var_args) :\n      arguments;\n\n  // Start with the 2nd parameter for the variable parameters syntax.\n  for (let i = isArrayLike ? 0 : 1; i < keys.length; i++) {\n    if (obj == null) return undefined;\n    obj = obj[keys[i]];\n  }\n\n  return obj;\n};\n\n\n/**\n * Whether the object/map/hash contains the given key.\n *\n * @param {Object} obj The object in which to look for key.\n * @param {?} key The key for which to check.\n * @return {boolean} true If the map contains the key.\n */\ngoog.object.containsKey = function(obj, key) {\n  return obj !== null && key in obj;\n};\n\n\n/**\n * Whether the object/map/hash contains the given value. This is O(n).\n *\n * @param {Object<K,V>} obj The object in which to look for val.\n * @param {V} val The value for which to check.\n * @return {boolean} true If the map contains the value.\n * @template K,V\n */\ngoog.object.containsValue = function(obj, val) {\n  for (const key in obj) {\n    if (obj[key] == val) {\n      return true;\n    }\n  }\n  return false;\n};\n\n\n/**\n * Searches an object for an element that satisfies the given condition and\n * returns its key.\n * @param {Object<K,V>} obj The object to search in.\n * @param {function(this:T,V,string,Object<K,V>):boolean} f The\n *      function to call for every element. Takes 3 arguments (the value,\n *     the key and the object) and should return a boolean.\n * @param {T=} opt_this An optional \"this\" context for the function.\n * @return {string|undefined} The key of an element for which the function\n *     returns true or undefined if no such element is found.\n * @template T,K,V\n */\ngoog.object.findKey = function(obj, f, opt_this) {\n  for (const key in obj) {\n    if (f.call(/** @type {?} */ (opt_this), obj[key], key, obj)) {\n      return key;\n    }\n  }\n  return undefined;\n};\n\n\n/**\n * Searches an object for an element that satisfies the given condition and\n * returns its value.\n * @param {Object<K,V>} obj The object to search in.\n * @param {function(this:T,V,string,Object<K,V>):boolean} f The function\n *     to call for every element. Takes 3 arguments (the value, the key\n *     and the object) and should return a boolean.\n * @param {T=} opt_this An optional \"this\" context for the function.\n * @return {V} The value of an element for which the function returns true or\n *     undefined if no such element is found.\n * @template T,K,V\n */\ngoog.object.findValue = function(obj, f, opt_this) {\n  const key = goog.object.findKey(obj, f, opt_this);\n  return key && obj[key];\n};\n\n\n/**\n * Whether the object/map/hash is empty.\n *\n * @param {Object} obj The object to test.\n * @return {boolean} true if obj is empty.\n */\ngoog.object.isEmpty = function(obj) {\n  for (const key in obj) {\n    return false;\n  }\n  return true;\n};\n\n\n/**\n * Removes all key value pairs from the object/map/hash.\n *\n * @param {Object} obj The object to clear.\n */\ngoog.object.clear = function(obj) {\n  for (const i in obj) {\n    delete obj[i];\n  }\n};\n\n\n/**\n * Removes a key-value pair based on the key.\n *\n * @param {Object} obj The object from which to remove the key.\n * @param {?} key The key to remove.\n * @return {boolean} Whether an element was removed.\n */\ngoog.object.remove = function(obj, key) {\n  let rv;\n  if (rv = key in /** @type {!Object} */ (obj)) {\n    delete obj[key];\n  }\n  return rv;\n};\n\n\n/**\n * Adds a key-value pair to the object. Throws an exception if the key is\n * already in use. Use set if you want to change an existing pair.\n *\n * @param {Object<K,V>} obj The object to which to add the key-value pair.\n * @param {string} key The key to add.\n * @param {V} val The value to add.\n * @template K,V\n */\ngoog.object.add = function(obj, key, val) {\n  if (obj !== null && key in obj) {\n    throw new Error('The object already contains the key \"' + key + '\"');\n  }\n  goog.object.set(obj, key, val);\n};\n\n\n/**\n * Returns the value for the given key.\n *\n * @param {Object<K,V>} obj The object from which to get the value.\n * @param {string} key The key for which to get the value.\n * @param {R=} opt_val The value to return if no item is found for the given\n *     key (default is undefined).\n * @return {V|R|undefined} The value for the given key.\n * @template K,V,R\n */\ngoog.object.get = function(obj, key, opt_val) {\n  if (obj !== null && key in obj) {\n    return obj[key];\n  }\n  return opt_val;\n};\n\n\n/**\n * Adds a key-value pair to the object/map/hash.\n *\n * @param {Object<K,V>} obj The object to which to add the key-value pair.\n * @param {string} key The key to add.\n * @param {V} value The value to add.\n * @template K,V\n */\ngoog.object.set = function(obj, key, value) {\n  obj[key] = value;\n};\n\n\n/**\n * Adds a key-value pair to the object/map/hash if it doesn't exist yet.\n *\n * @param {Object<K,V>} obj The object to which to add the key-value pair.\n * @param {string} key The key to add.\n * @param {V} value The value to add if the key wasn't present.\n * @return {V} The value of the entry at the end of the function.\n * @template K,V\n */\ngoog.object.setIfUndefined = function(obj, key, value) {\n  return key in /** @type {!Object} */ (obj) ? obj[key] : (obj[key] = value);\n};\n\n\n/**\n * Sets a key and value to an object if the key is not set. The value will be\n * the return value of the given function. If the key already exists, the\n * object will not be changed and the function will not be called (the function\n * will be lazily evaluated -- only called if necessary).\n *\n * This function is particularly useful when used with an `Object` which is\n * acting as a cache.\n *\n * @param {!Object<K,V>} obj The object to which to add the key-value pair.\n * @param {string} key The key to add.\n * @param {function():V} f The value to add if the key wasn't present.\n * @return {V} The value of the entry at the end of the function.\n * @template K,V\n */\ngoog.object.setWithReturnValueIfNotSet = function(obj, key, f) {\n  if (key in obj) {\n    return obj[key];\n  }\n\n  const val = f();\n  obj[key] = val;\n  return val;\n};\n\n\n/**\n * Compares two objects for equality using === on the values.\n *\n * @param {!Object<K,V>} a\n * @param {!Object<K,V>} b\n * @return {boolean}\n * @template K,V\n */\ngoog.object.equals = function(a, b) {\n  for (const k in a) {\n    if (!(k in b) || a[k] !== b[k]) {\n      return false;\n    }\n  }\n  for (const k in b) {\n    if (!(k in a)) {\n      return false;\n    }\n  }\n  return true;\n};\n\n\n/**\n * Returns a shallow clone of the object.\n *\n * @param {Object<K,V>} obj Object to clone.\n * @return {!Object<K,V>} Clone of the input object.\n * @template K,V\n */\ngoog.object.clone = function(obj) {\n  // We cannot use the prototype trick because a lot of methods depend on where\n  // the actual key is set.\n\n  const res = {};\n  for (const key in obj) {\n    res[key] = obj[key];\n  }\n  return res;\n  // We could also use goog.mixin but I wanted this to be independent from that.\n};\n\n\n/**\n * Clones a value. The input may be an Object, Array, or basic type. Objects and\n * arrays will be cloned recursively.\n *\n * WARNINGS:\n * <code>goog.object.unsafeClone</code> does not detect reference loops. Objects\n * that refer to themselves will cause infinite recursion.\n *\n * <code>goog.object.unsafeClone</code> is unaware of unique identifiers, and\n * copies UIDs created by <code>getUid</code> into cloned results.\n *\n * @param {T} obj The value to clone.\n * @return {T} A clone of the input value.\n * @template T\n */\ngoog.object.unsafeClone = function(obj) {\n  const type = goog.typeOf(obj);\n  if (type == 'object' || type == 'array') {\n    if (goog.isFunction(obj.clone)) {\n      return obj.clone();\n    }\n    const clone = type == 'array' ? [] : {};\n    for (const key in obj) {\n      clone[key] = goog.object.unsafeClone(obj[key]);\n    }\n    return clone;\n  }\n\n  return obj;\n};\n\n\n/**\n * Returns a new object in which all the keys and values are interchanged\n * (keys become values and values become keys). If multiple keys map to the\n * same value, the chosen transposed value is implementation-dependent.\n *\n * @param {Object} obj The object to transpose.\n * @return {!Object} The transposed object.\n */\ngoog.object.transpose = function(obj) {\n  const transposed = {};\n  for (const key in obj) {\n    transposed[obj[key]] = key;\n  }\n  return transposed;\n};\n\n\n/**\n * The names of the fields that are defined on Object.prototype.\n * @type {Array<string>}\n * @private\n */\ngoog.object.PROTOTYPE_FIELDS_ = [\n  'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',\n  'toLocaleString', 'toString', 'valueOf'\n];\n\n\n/**\n * Extends an object with another object.\n * This operates 'in-place'; it does not create a new Object.\n *\n * Example:\n * var o = {};\n * goog.object.extend(o, {a: 0, b: 1});\n * o; // {a: 0, b: 1}\n * goog.object.extend(o, {b: 2, c: 3});\n * o; // {a: 0, b: 2, c: 3}\n *\n * @param {Object} target The object to modify. Existing properties will be\n *     overwritten if they are also present in one of the objects in\n *     `var_args`.\n * @param {...(Object|null|undefined)} var_args The objects from which values\n *     will be copied.\n * @deprecated Prefer Object.assign\n */\ngoog.object.extend = function(target, var_args) {\n  let key;\n  let source;\n  for (let i = 1; i < arguments.length; i++) {\n    source = arguments[i];\n    for (key in source) {\n      target[key] = source[key];\n    }\n\n    // For IE the for-in-loop does not contain any properties that are not\n    // enumerable on the prototype object (for example isPrototypeOf from\n    // Object.prototype) and it will also not include 'replace' on objects that\n    // extend String and change 'replace' (not that it is common for anyone to\n    // extend anything except Object).\n\n    for (let j = 0; j < goog.object.PROTOTYPE_FIELDS_.length; j++) {\n      key = goog.object.PROTOTYPE_FIELDS_[j];\n      if (Object.prototype.hasOwnProperty.call(source, key)) {\n        target[key] = source[key];\n      }\n    }\n  }\n};\n\n\n/**\n * Creates a new object built from the key-value pairs provided as arguments.\n * @param {...*} var_args If only one argument is provided and it is an array\n *     then this is used as the arguments, otherwise even arguments are used as\n *     the property names and odd arguments are used as the property values.\n * @return {!Object} The new object.\n * @throws {Error} If there are uneven number of arguments or there is only one\n *     non array argument.\n */\ngoog.object.create = function(var_args) {\n  const argLength = arguments.length;\n  if (argLength == 1 && Array.isArray(arguments[0])) {\n    return goog.object.create.apply(null, arguments[0]);\n  }\n\n  if (argLength % 2) {\n    throw new Error('Uneven number of arguments');\n  }\n\n  const rv = {};\n  for (let i = 0; i < argLength; i += 2) {\n    rv[arguments[i]] = arguments[i + 1];\n  }\n  return rv;\n};\n\n\n/**\n * Creates a new object where the property names come from the arguments but\n * the value is always set to true\n * @param {...*} var_args If only one argument is provided and it is an array\n *     then this is used as the arguments, otherwise the arguments are used\n *     as the property names.\n * @return {!Object} The new object.\n */\ngoog.object.createSet = function(var_args) {\n  const argLength = arguments.length;\n  if (argLength == 1 && Array.isArray(arguments[0])) {\n    return goog.object.createSet.apply(null, arguments[0]);\n  }\n\n  const rv = {};\n  for (let i = 0; i < argLength; i++) {\n    rv[arguments[i]] = true;\n  }\n  return rv;\n};\n\n\n/**\n * Creates an immutable view of the underlying object, if the browser\n * supports immutable objects.\n *\n * In default mode, writes to this view will fail silently. In strict mode,\n * they will throw an error.\n *\n * @param {!Object<K,V>} obj An object.\n * @return {!Object<K,V>} An immutable view of that object, or the\n *     original object if this browser does not support immutables.\n * @template K,V\n */\ngoog.object.createImmutableView = function(obj) {\n  let result = obj;\n  if (Object.isFrozen && !Object.isFrozen(obj)) {\n    result = Object.create(obj);\n    Object.freeze(result);\n  }\n  return result;\n};\n\n\n/**\n * @param {!Object} obj An object.\n * @return {boolean} Whether this is an immutable view of the object.\n */\ngoog.object.isImmutableView = function(obj) {\n  return !!Object.isFrozen && Object.isFrozen(obj);\n};\n\n\n/**\n * Get all properties names on a given Object regardless of enumerability.\n *\n * <p> If the browser does not support `Object.getOwnPropertyNames` nor\n * `Object.getPrototypeOf` then this is equivalent to using\n * `goog.object.getKeys`\n *\n * @param {?Object} obj The object to get the properties of.\n * @param {boolean=} opt_includeObjectPrototype Whether properties defined on\n *     `Object.prototype` should be included in the result.\n * @param {boolean=} opt_includeFunctionPrototype Whether properties defined on\n *     `Function.prototype` should be included in the result.\n * @return {!Array<string>}\n * @public\n */\ngoog.object.getAllPropertyNames = function(\n    obj, opt_includeObjectPrototype, opt_includeFunctionPrototype) {\n  if (!obj) {\n    return [];\n  }\n\n  // Naively use a for..in loop to get the property names if the browser doesn't\n  // support any other APIs for getting it.\n  if (!Object.getOwnPropertyNames || !Object.getPrototypeOf) {\n    return goog.object.getKeys(obj);\n  }\n\n  const visitedSet = {};\n\n  // Traverse the prototype chain and add all properties to the visited set.\n  let proto = obj;\n  while (proto &&\n         (proto !== Object.prototype || !!opt_includeObjectPrototype) &&\n         (proto !== Function.prototype || !!opt_includeFunctionPrototype)) {\n    const names = Object.getOwnPropertyNames(proto);\n    for (let i = 0; i < names.length; i++) {\n      visitedSet[names[i]] = true;\n    }\n    proto = Object.getPrototypeOf(proto);\n  }\n\n  return goog.object.getKeys(visitedSet);\n};\n\n\n/**\n * Given a ES5 or ES6 class reference, return its super class / super\n * constructor.\n *\n * This should be used in rare cases where you need to walk up the inheritance\n * tree (this is generally a bad idea). But this work with ES5 and ES6 classes,\n * unlike relying on the superClass_ property.\n *\n * Note: To start walking up the hierarchy from an instance call this with its\n * `constructor` property; e.g. `getSuperClass(instance.constructor)`.\n *\n * @param {function(new: ?)} constructor\n * @return {?Object}\n */\ngoog.object.getSuperClass = function(constructor) {\n  var proto = Object.getPrototypeOf(constructor.prototype);\n  return proto && proto.constructor;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Useful compiler idioms.\n */\n\ngoog.provide('goog.reflect');\n\n\n/**\n * Syntax for object literal casts.\n * @see http://go/jscompiler-renaming\n * @see https://goo.gl/CRs09P\n *\n * Use this if you have an object literal whose keys need to have the same names\n * as the properties of some class even after they are renamed by the compiler.\n *\n * @param {!Function} type Type to cast to.\n * @param {Object} object Object literal to cast.\n * @return {Object} The object literal.\n */\ngoog.reflect.object = function(type, object) {\n  return object;\n};\n\n/**\n * Syntax for renaming property strings.\n * @see http://go/jscompiler-renaming\n * @see https://goo.gl/CRs09P\n *\n * Use this if you have an need to access a property as a string, but want\n * to also have the property renamed by the compiler. In contrast to\n * goog.reflect.object, this method takes an instance of an object.\n *\n * Properties must be simple names (not qualified names).\n *\n * @param {string} prop Name of the property\n * @param {!Object} object Instance of the object whose type will be used\n *     for renaming\n * @return {string} The renamed property.\n */\ngoog.reflect.objectProperty = function(prop, object) {\n  return prop;\n};\n\n/**\n * To assert to the compiler that an operation is needed when it would\n * otherwise be stripped. For example:\n * <code>\n *     // Force a layout\n *     goog.reflect.sinkValue(dialog.offsetHeight);\n * </code>\n * @param {T} x\n * @return {T}\n * @template T\n */\ngoog.reflect.sinkValue = function(x) {\n  goog.reflect.sinkValue[' '](x);\n  return x;\n};\n\n\n/**\n * The compiler should optimize this function away iff no one ever uses\n * goog.reflect.sinkValue.\n */\ngoog.reflect.sinkValue[' '] = goog.nullFunction;\n\n\n/**\n * Check if a property can be accessed without throwing an exception.\n * @param {Object} obj The owner of the property.\n * @param {string} prop The property name.\n * @return {boolean} Whether the property is accessible. Will also return true\n *     if obj is null.\n */\ngoog.reflect.canAccessProperty = function(obj, prop) {\n\n  try {\n    goog.reflect.sinkValue(obj[prop]);\n    return true;\n  } catch (e) {\n  }\n  return false;\n};\n\n\n/**\n * Retrieves a value from a cache given a key. The compiler provides special\n * consideration for this call such that it is generally considered side-effect\n * free. However, if the `opt_keyFn` or `valueFn` have side-effects\n * then the entire call is considered to have side-effects.\n *\n * Conventionally storing the value on the cache would be considered a\n * side-effect and preclude unused calls from being pruned, ie. even if\n * the value was never used, it would still always be stored in the cache.\n *\n * Providing a side-effect free `valueFn` and `opt_keyFn`\n * allows unused calls to `goog.reflect.cache` to be pruned.\n *\n * @param {!Object<K, V>} cacheObj The object that contains the cached values.\n * @param {?} key The key to lookup in the cache. If it is not string or number\n *     then a `opt_keyFn` should be provided. The key is also used as the\n *     parameter to the `valueFn`.\n * @param {function(?):V} valueFn The value provider to use to calculate the\n *     value to store in the cache. This function should be side-effect free\n *     to take advantage of the optimization.\n * @param {function(?):K=} opt_keyFn The key provider to determine the cache\n *     map key. This should be used if the given key is not a string or number.\n *     If not provided then the given key is used. This function should be\n *     side-effect free to take advantage of the optimization.\n * @return {V} The cached or calculated value.\n * @template K\n * @template V\n */\ngoog.reflect.cache = function(cacheObj, key, valueFn, opt_keyFn) {\n  const storedKey = opt_keyFn ? opt_keyFn(key) : key;\n\n  if (Object.prototype.hasOwnProperty.call(cacheObj, storedKey)) {\n    return cacheObj[storedKey];\n  }\n\n  return (cacheObj[storedKey] = valueFn(key));\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Rendering engine detection.\n * @see <a href=\"http://www.useragentstring.com/\">User agent strings</a>\n * For information on the browser brand (such as Safari versus Chrome), see\n * goog.userAgent.product.\n * @see ../demos/useragent.html\n */\n\ngoog.provide('goog.userAgent');\n\ngoog.require('goog.labs.userAgent.browser');\ngoog.require('goog.labs.userAgent.engine');\ngoog.require('goog.labs.userAgent.platform');\ngoog.require('goog.labs.userAgent.util');\ngoog.require('goog.reflect');\ngoog.require('goog.string');\n\n\n/**\n * @define {boolean} Whether we know at compile-time that the browser is IE.\n */\ngoog.userAgent.ASSUME_IE = goog.define('goog.userAgent.ASSUME_IE', false);\n\n\n/**\n * @define {boolean} Whether we know at compile-time that the browser is EDGE,\n * referring to EdgeHTML based Edge.\n */\ngoog.userAgent.ASSUME_EDGE = goog.define('goog.userAgent.ASSUME_EDGE', false);\n\n\n/**\n * @define {boolean} Whether we know at compile-time that the browser is GECKO.\n */\ngoog.userAgent.ASSUME_GECKO = goog.define('goog.userAgent.ASSUME_GECKO', false);\n\n\n/**\n * @define {boolean} Whether we know at compile-time that the browser is WEBKIT.\n */\ngoog.userAgent.ASSUME_WEBKIT =\n    goog.define('goog.userAgent.ASSUME_WEBKIT', false);\n\n\n/**\n * @define {boolean} Whether we know at compile-time that the browser is a\n *     mobile device running WebKit e.g. iPhone or Android.\n */\ngoog.userAgent.ASSUME_MOBILE_WEBKIT =\n    goog.define('goog.userAgent.ASSUME_MOBILE_WEBKIT', false);\n\n\n/**\n * @define {boolean} Whether we know at compile-time that the browser is OPERA,\n * referring to Presto-based Opera.\n */\ngoog.userAgent.ASSUME_OPERA = goog.define('goog.userAgent.ASSUME_OPERA', false);\n\n\n/**\n * @define {boolean} Whether the\n *     `goog.userAgent.isVersionOrHigher`\n *     function will return true for any version.\n */\ngoog.userAgent.ASSUME_ANY_VERSION =\n    goog.define('goog.userAgent.ASSUME_ANY_VERSION', false);\n\n\n/**\n * Whether we know the browser engine at compile-time.\n * @type {boolean}\n * @private\n */\ngoog.userAgent.BROWSER_KNOWN_ = goog.userAgent.ASSUME_IE ||\n    goog.userAgent.ASSUME_EDGE || goog.userAgent.ASSUME_GECKO ||\n    goog.userAgent.ASSUME_MOBILE_WEBKIT || goog.userAgent.ASSUME_WEBKIT ||\n    goog.userAgent.ASSUME_OPERA;\n\n\n/**\n * Returns the userAgent string for the current browser.\n *\n * @return {string} The userAgent string.\n */\ngoog.userAgent.getUserAgentString = function() {\n  return goog.labs.userAgent.util.getUserAgent();\n};\n\n\n/**\n * @return {?Navigator} The native navigator object.\n */\ngoog.userAgent.getNavigatorTyped = function() {\n  // Need a local navigator reference instead of using the global one,\n  // to avoid the rare case where they reference different objects.\n  // (in a WorkerPool, for example).\n  return goog.global['navigator'] || null;\n};\n\n\n/**\n * TODO(nnaze): Change type to \"Navigator\" and update compilation targets.\n * @return {?Object} The native navigator object.\n */\ngoog.userAgent.getNavigator = function() {\n  return goog.userAgent.getNavigatorTyped();\n};\n\n\n/**\n * Whether the user agent is Presto-based Opera.\n * @type {boolean}\n */\ngoog.userAgent.OPERA = goog.userAgent.BROWSER_KNOWN_ ?\n    goog.userAgent.ASSUME_OPERA :\n    goog.labs.userAgent.browser.isOpera();\n\n\n/**\n * Whether the user agent is Internet Explorer.\n * @type {boolean}\n */\ngoog.userAgent.IE = goog.userAgent.BROWSER_KNOWN_ ?\n    goog.userAgent.ASSUME_IE :\n    goog.labs.userAgent.browser.isIE();\n\n\n/**\n * Whether the user agent is Microsoft Edge (EdgeHTML based).\n * @type {boolean}\n */\ngoog.userAgent.EDGE = goog.userAgent.BROWSER_KNOWN_ ?\n    goog.userAgent.ASSUME_EDGE :\n    goog.labs.userAgent.engine.isEdge();\n\n\n/**\n * Whether the user agent is MS Internet Explorer or MS Edge (EdgeHTML based).\n * @type {boolean}\n */\ngoog.userAgent.EDGE_OR_IE = goog.userAgent.EDGE || goog.userAgent.IE;\n\n\n/**\n * Whether the user agent is Gecko. Gecko is the rendering engine used by\n * Mozilla, Firefox, and others.\n * @type {boolean}\n */\ngoog.userAgent.GECKO = goog.userAgent.BROWSER_KNOWN_ ?\n    goog.userAgent.ASSUME_GECKO :\n    goog.labs.userAgent.engine.isGecko();\n\n\n/**\n * Whether the user agent is WebKit. WebKit is the rendering engine that\n * Safari, Edge Chromium, Opera Chromium, Android and others use.\n * @type {boolean}\n */\ngoog.userAgent.WEBKIT = goog.userAgent.BROWSER_KNOWN_ ?\n    goog.userAgent.ASSUME_WEBKIT || goog.userAgent.ASSUME_MOBILE_WEBKIT :\n    goog.labs.userAgent.engine.isWebKit();\n\n\n/**\n * Whether the user agent is running on a mobile device.\n *\n * This is a separate function so that the logic can be tested.\n *\n * TODO(nnaze): Investigate swapping in goog.labs.userAgent.device.isMobile().\n *\n * @return {boolean} Whether the user agent is running on a mobile device.\n * @private\n */\ngoog.userAgent.isMobile_ = function() {\n  return goog.userAgent.WEBKIT &&\n      goog.labs.userAgent.util.matchUserAgent('Mobile');\n};\n\n\n/**\n * Whether the user agent is running on a mobile device.\n *\n * TODO(nnaze): Consider deprecating MOBILE when labs.userAgent\n *   is promoted as the gecko/webkit logic is likely inaccurate.\n *\n * @type {boolean}\n */\ngoog.userAgent.MOBILE =\n    goog.userAgent.ASSUME_MOBILE_WEBKIT || goog.userAgent.isMobile_();\n\n\n/**\n * Used while transitioning code to use WEBKIT instead.\n * @type {boolean}\n * @deprecated Use {@link goog.userAgent.product.SAFARI} instead.\n * TODO(nicksantos): Delete this from goog.userAgent.\n */\ngoog.userAgent.SAFARI = goog.userAgent.WEBKIT;\n\n\n/**\n * @return {string} the platform (operating system) the user agent is running\n *     on. Default to empty string because navigator.platform may not be defined\n *     (on Rhino, for example).\n * @private\n */\ngoog.userAgent.determinePlatform_ = function() {\n  var navigator = goog.userAgent.getNavigatorTyped();\n  return navigator && navigator.platform || '';\n};\n\n\n/**\n * The platform (operating system) the user agent is running on. Default to\n * empty string because navigator.platform may not be defined (on Rhino, for\n * example).\n * @type {string}\n */\ngoog.userAgent.PLATFORM = goog.userAgent.determinePlatform_();\n\n\n/**\n * @define {boolean} Whether the user agent is running on a Macintosh operating\n *     system.\n */\ngoog.userAgent.ASSUME_MAC = goog.define('goog.userAgent.ASSUME_MAC', false);\n\n\n/**\n * @define {boolean} Whether the user agent is running on a Windows operating\n *     system.\n */\ngoog.userAgent.ASSUME_WINDOWS =\n    goog.define('goog.userAgent.ASSUME_WINDOWS', false);\n\n\n/**\n * @define {boolean} Whether the user agent is running on a Linux operating\n *     system.\n */\ngoog.userAgent.ASSUME_LINUX = goog.define('goog.userAgent.ASSUME_LINUX', false);\n\n\n/**\n * @define {boolean} Whether the user agent is running on a X11 windowing\n *     system.\n */\ngoog.userAgent.ASSUME_X11 = goog.define('goog.userAgent.ASSUME_X11', false);\n\n\n/**\n * @define {boolean} Whether the user agent is running on Android.\n */\ngoog.userAgent.ASSUME_ANDROID =\n    goog.define('goog.userAgent.ASSUME_ANDROID', false);\n\n\n/**\n * @define {boolean} Whether the user agent is running on an iPhone.\n */\ngoog.userAgent.ASSUME_IPHONE =\n    goog.define('goog.userAgent.ASSUME_IPHONE', false);\n\n\n/**\n * @define {boolean} Whether the user agent is running on an iPad.\n */\ngoog.userAgent.ASSUME_IPAD = goog.define('goog.userAgent.ASSUME_IPAD', false);\n\n\n/**\n * @define {boolean} Whether the user agent is running on an iPod.\n */\ngoog.userAgent.ASSUME_IPOD = goog.define('goog.userAgent.ASSUME_IPOD', false);\n\n\n/**\n * @define {boolean} Whether the user agent is running on KaiOS.\n */\ngoog.userAgent.ASSUME_KAIOS = goog.define('goog.userAgent.ASSUME_KAIOS', false);\n\n\n/**\n * @type {boolean}\n * @private\n */\ngoog.userAgent.PLATFORM_KNOWN_ = goog.userAgent.ASSUME_MAC ||\n    goog.userAgent.ASSUME_WINDOWS || goog.userAgent.ASSUME_LINUX ||\n    goog.userAgent.ASSUME_X11 || goog.userAgent.ASSUME_ANDROID ||\n    goog.userAgent.ASSUME_IPHONE || goog.userAgent.ASSUME_IPAD ||\n    goog.userAgent.ASSUME_IPOD;\n\n\n/**\n * Whether the user agent is running on a Macintosh operating system.\n * @type {boolean}\n */\ngoog.userAgent.MAC = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_MAC :\n    goog.labs.userAgent.platform.isMacintosh();\n\n\n/**\n * Whether the user agent is running on a Windows operating system.\n * @type {boolean}\n */\ngoog.userAgent.WINDOWS = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_WINDOWS :\n    goog.labs.userAgent.platform.isWindows();\n\n\n/**\n * Whether the user agent is Linux per the legacy behavior of\n * goog.userAgent.LINUX, which considered ChromeOS to also be\n * Linux.\n * @return {boolean}\n * @private\n */\ngoog.userAgent.isLegacyLinux_ = function() {\n  return goog.labs.userAgent.platform.isLinux() ||\n      goog.labs.userAgent.platform.isChromeOS();\n};\n\n\n/**\n * Whether the user agent is running on a Linux operating system.\n *\n * Note that goog.userAgent.LINUX considers ChromeOS to be Linux,\n * while goog.labs.userAgent.platform considers ChromeOS and\n * Linux to be different OSes.\n *\n * @type {boolean}\n */\ngoog.userAgent.LINUX = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_LINUX :\n    goog.userAgent.isLegacyLinux_();\n\n\n/**\n * @return {boolean} Whether the user agent is an X11 windowing system.\n * @private\n */\ngoog.userAgent.isX11_ = function() {\n  var navigator = goog.userAgent.getNavigatorTyped();\n  return !!navigator &&\n      goog.string.contains(navigator['appVersion'] || '', 'X11');\n};\n\n\n/**\n * Whether the user agent is running on a X11 windowing system.\n * @type {boolean}\n */\ngoog.userAgent.X11 = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_X11 :\n    goog.userAgent.isX11_();\n\n\n/**\n * Whether the user agent is running on Android.\n * @type {boolean}\n */\ngoog.userAgent.ANDROID = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_ANDROID :\n    goog.labs.userAgent.platform.isAndroid();\n\n\n/**\n * Whether the user agent is running on an iPhone.\n * @type {boolean}\n */\ngoog.userAgent.IPHONE = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_IPHONE :\n    goog.labs.userAgent.platform.isIphone();\n\n\n/**\n * Whether the user agent is running on an iPad.\n * @type {boolean}\n */\ngoog.userAgent.IPAD = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_IPAD :\n    goog.labs.userAgent.platform.isIpad();\n\n\n/**\n * Whether the user agent is running on an iPod.\n * @type {boolean}\n */\ngoog.userAgent.IPOD = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_IPOD :\n    goog.labs.userAgent.platform.isIpod();\n\n\n/**\n * Whether the user agent is running on iOS.\n * @type {boolean}\n */\ngoog.userAgent.IOS = goog.userAgent.PLATFORM_KNOWN_ ?\n    (goog.userAgent.ASSUME_IPHONE || goog.userAgent.ASSUME_IPAD ||\n     goog.userAgent.ASSUME_IPOD) :\n    goog.labs.userAgent.platform.isIos();\n\n/**\n * Whether the user agent is running on KaiOS.\n * @type {boolean}\n */\ngoog.userAgent.KAIOS = goog.userAgent.PLATFORM_KNOWN_ ?\n    goog.userAgent.ASSUME_KAIOS :\n    goog.labs.userAgent.platform.isKaiOS();\n\n\n/**\n * @return {string} The string that describes the version number of the user\n *     agent.\n * @private\n */\ngoog.userAgent.determineVersion_ = function() {\n  // All browsers have different ways to detect the version and they all have\n  // different naming schemes.\n  // version is a string rather than a number because it may contain 'b', 'a',\n  // and so on.\n  var version = '';\n  var arr = goog.userAgent.getVersionRegexResult_();\n  if (arr) {\n    version = arr ? arr[1] : '';\n  }\n\n  if (goog.userAgent.IE) {\n    // IE9 can be in document mode 9 but be reporting an inconsistent user agent\n    // version.  If it is identifying as a version lower than 9 we take the\n    // documentMode as the version instead.  IE8 has similar behavior.\n    // It is recommended to set the X-UA-Compatible header to ensure that IE9\n    // uses documentMode 9.\n    var docMode = goog.userAgent.getDocumentMode_();\n    if (docMode != null && docMode > parseFloat(version)) {\n      return String(docMode);\n    }\n  }\n\n  return version;\n};\n\n\n/**\n * @return {?IArrayLike<string>|undefined} The version regex matches from\n *     parsing the user\n *     agent string. These regex statements must be executed inline so they can\n *     be compiled out by the closure compiler with the rest of the useragent\n *     detection logic when ASSUME_* is specified.\n * @private\n */\ngoog.userAgent.getVersionRegexResult_ = function() {\n  var userAgent = goog.userAgent.getUserAgentString();\n  if (goog.userAgent.GECKO) {\n    return /rv\\:([^\\);]+)(\\)|;)/.exec(userAgent);\n  }\n  if (goog.userAgent.EDGE) {\n    return /Edge\\/([\\d\\.]+)/.exec(userAgent);\n  }\n  if (goog.userAgent.IE) {\n    return /\\b(?:MSIE|rv)[: ]([^\\);]+)(\\)|;)/.exec(userAgent);\n  }\n  if (goog.userAgent.WEBKIT) {\n    // WebKit/125.4\n    return /WebKit\\/(\\S+)/.exec(userAgent);\n  }\n  if (goog.userAgent.OPERA) {\n    // If none of the above browsers were detected but the browser is Opera, the\n    // only string that is of interest is 'Version/<number>'.\n    return /(?:Version)[ \\/]?(\\S+)/.exec(userAgent);\n  }\n  return undefined;\n};\n\n\n/**\n * @return {number|undefined} Returns the document mode (for testing).\n * @private\n */\ngoog.userAgent.getDocumentMode_ = function() {\n  // NOTE(user): goog.userAgent may be used in context where there is no DOM.\n  var doc = goog.global['document'];\n  return doc ? doc['documentMode'] : undefined;\n};\n\n\n/**\n * The version of the user agent. This is a string because it might contain\n * 'b' (as in beta) as well as multiple dots.\n * @type {string}\n */\ngoog.userAgent.VERSION = goog.userAgent.determineVersion_();\n\n\n/**\n * Compares two version numbers.\n *\n * @param {string} v1 Version of first item.\n * @param {string} v2 Version of second item.\n *\n * @return {number}  1 if first argument is higher\n *                   0 if arguments are equal\n *                  -1 if second argument is higher.\n * @deprecated Use goog.string.compareVersions.\n */\ngoog.userAgent.compare = function(v1, v2) {\n  return goog.string.compareVersions(v1, v2);\n};\n\n\n/**\n * Cache for {@link goog.userAgent.isVersionOrHigher}.\n * Calls to compareVersions are surprisingly expensive and, as a browser's\n * version number is unlikely to change during a session, we cache the results.\n * @const\n * @private\n */\ngoog.userAgent.isVersionOrHigherCache_ = {};\n\n\n/**\n * Whether the user agent version is higher or the same as the given version.\n * NOTE: When checking the version numbers for Firefox and Safari, be sure to\n * use the engine's version, not the browser's version number.  For example,\n * Firefox 3.0 corresponds to Gecko 1.9 and Safari 3.0 to Webkit 522.11.\n * Opera and Internet Explorer versions match the product release number.<br>\n * @see <a href=\"http://en.wikipedia.org/wiki/Safari_version_history\">\n *     Webkit</a>\n * @see <a href=\"http://en.wikipedia.org/wiki/Gecko_engine\">Gecko</a>\n *\n * @param {string|number} version The version to check.\n * @return {boolean} Whether the user agent version is higher or the same as\n *     the given version.\n */\ngoog.userAgent.isVersionOrHigher = function(version) {\n  return goog.userAgent.ASSUME_ANY_VERSION ||\n      goog.reflect.cache(\n          goog.userAgent.isVersionOrHigherCache_, version, function() {\n            return goog.string.compareVersions(\n                       goog.userAgent.VERSION, version) >= 0;\n          });\n};\n\n\n/**\n * Deprecated alias to `goog.userAgent.isVersionOrHigher`.\n * @param {string|number} version The version to check.\n * @return {boolean} Whether the user agent version is higher or the same as\n *     the given version.\n * @deprecated Use goog.userAgent.isVersionOrHigher().\n */\ngoog.userAgent.isVersion = goog.userAgent.isVersionOrHigher;\n\n\n/**\n * Whether the IE effective document mode is higher or the same as the given\n * document mode version.\n * NOTE: Only for IE, return false for another browser.\n *\n * @param {number} documentMode The document mode version to check.\n * @return {boolean} Whether the IE effective document mode is higher or the\n *     same as the given version.\n */\ngoog.userAgent.isDocumentModeOrHigher = function(documentMode) {\n  return Number(goog.userAgent.DOCUMENT_MODE) >= documentMode;\n};\n\n\n/**\n * Deprecated alias to `goog.userAgent.isDocumentModeOrHigher`.\n * @param {number} version The version to check.\n * @return {boolean} Whether the IE effective document mode is higher or the\n *      same as the given version.\n * @deprecated Use goog.userAgent.isDocumentModeOrHigher().\n */\ngoog.userAgent.isDocumentMode = goog.userAgent.isDocumentModeOrHigher;\n\n\n/**\n * For IE version < 7, documentMode is undefined, so attempt to use the\n * CSS1Compat property to see if we are in standards mode. If we are in\n * standards mode, treat the browser version as the document mode. Otherwise,\n * IE is emulating version 5.\n *\n * NOTE(user): Support for IE < 7 is long gone, so this is now simplified.\n * It returns document.documentMode for IE and undefined for everything else.\n *\n * @type {number|undefined}\n * @const\n */\ngoog.userAgent.DOCUMENT_MODE = (function() {\n  var doc = goog.global['document'];\n  if (!doc || !goog.userAgent.IE) return undefined;\n  // This must be an IE user agent.\n  var documentMode = goog.userAgent.getDocumentMode_();\n  if (documentMode) return documentMode;\n  // The user agent version string begins with the major version.\n  // Parse the major version and truncate anything following.\n  var ieVersion = parseInt(goog.userAgent.VERSION, 10);\n  return ieVersion || undefined;\n})();\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Closure user agent detection (Browser).\n * @see <a href=\"http://www.useragentstring.com/\">User agent strings</a>\n * For more information on rendering engine, platform, or device see the other\n * sub-namespaces in goog.labs.userAgent, goog.labs.userAgent.platform,\n * goog.labs.userAgent.device respectively.)\n */\n\ngoog.provide('goog.labs.userAgent.browser');\n\ngoog.require('goog.array');\ngoog.require('goog.labs.userAgent.util');\ngoog.require('goog.object');\ngoog.require('goog.string.internal');\n\n\n// TODO(nnaze): Refactor to remove excessive exclusion logic in matching\n// functions.\n\n\n/**\n * @return {boolean} Whether the user's browser is Opera.  Note: Chromium\n *     based Opera (Opera 15+) is detected as Chrome to avoid unnecessary\n *     special casing.\n * @private\n */\ngoog.labs.userAgent.browser.matchOpera_ = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Opera');\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is IE.\n * @private\n */\ngoog.labs.userAgent.browser.matchIE_ = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Trident') ||\n      goog.labs.userAgent.util.matchUserAgent('MSIE');\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is Edge. This refers to EdgeHTML\n * based Edge.\n * @private\n */\ngoog.labs.userAgent.browser.matchEdgeHtml_ = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Edge');\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is Chromium based Edge.\n * @private\n */\ngoog.labs.userAgent.browser.matchEdgeChromium_ = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Edg/');\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is Chromium based Opera.\n * @private\n */\ngoog.labs.userAgent.browser.matchOperaChromium_ = function() {\n  return goog.labs.userAgent.util.matchUserAgent('OPR');\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is Firefox.\n * @private\n */\ngoog.labs.userAgent.browser.matchFirefox_ = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Firefox') ||\n      goog.labs.userAgent.util.matchUserAgent('FxiOS');\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is Safari.\n * @private\n */\ngoog.labs.userAgent.browser.matchSafari_ = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Safari') &&\n      !(goog.labs.userAgent.browser.matchChrome_() ||\n        goog.labs.userAgent.browser.matchCoast_() ||\n        goog.labs.userAgent.browser.matchOpera_() ||\n        goog.labs.userAgent.browser.matchEdgeHtml_() ||\n        goog.labs.userAgent.browser.matchEdgeChromium_() ||\n        goog.labs.userAgent.browser.matchOperaChromium_() ||\n        goog.labs.userAgent.browser.matchFirefox_() ||\n        goog.labs.userAgent.browser.isSilk() ||\n        goog.labs.userAgent.util.matchUserAgent('Android'));\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based\n *     iOS browser).\n * @private\n */\ngoog.labs.userAgent.browser.matchCoast_ = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Coast');\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is iOS Webview.\n * @private\n */\ngoog.labs.userAgent.browser.matchIosWebview_ = function() {\n  // iOS Webview does not show up as Chrome or Safari. Also check for Opera's\n  // WebKit-based iOS browser, Coast.\n  return (goog.labs.userAgent.util.matchUserAgent('iPad') ||\n          goog.labs.userAgent.util.matchUserAgent('iPhone')) &&\n      !goog.labs.userAgent.browser.matchSafari_() &&\n      !goog.labs.userAgent.browser.matchChrome_() &&\n      !goog.labs.userAgent.browser.matchCoast_() &&\n      !goog.labs.userAgent.browser.matchFirefox_() &&\n      goog.labs.userAgent.util.matchUserAgent('AppleWebKit');\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is any Chromium browser. This\n * returns true for Chrome, Opera 15+, and Edge Chromium.\n * @private\n */\ngoog.labs.userAgent.browser.matchChrome_ = function() {\n  return (goog.labs.userAgent.util.matchUserAgent('Chrome') ||\n          goog.labs.userAgent.util.matchUserAgent('CriOS')) &&\n      !goog.labs.userAgent.browser.matchEdgeHtml_();\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is the Android browser.\n * @private\n */\ngoog.labs.userAgent.browser.matchAndroidBrowser_ = function() {\n  // Android can appear in the user agent string for Chrome on Android.\n  // This is not the Android standalone browser if it does.\n  return goog.labs.userAgent.util.matchUserAgent('Android') &&\n      !(goog.labs.userAgent.browser.isChrome() ||\n        goog.labs.userAgent.browser.isFirefox() ||\n        goog.labs.userAgent.browser.isOpera() ||\n        goog.labs.userAgent.browser.isSilk());\n};\n\n\n/**\n * @return {boolean} Whether the user's browser is Opera.\n */\ngoog.labs.userAgent.browser.isOpera = goog.labs.userAgent.browser.matchOpera_;\n\n\n/**\n * @return {boolean} Whether the user's browser is IE.\n */\ngoog.labs.userAgent.browser.isIE = goog.labs.userAgent.browser.matchIE_;\n\n\n/**\n * @return {boolean} Whether the user's browser is EdgeHTML based Edge.\n */\ngoog.labs.userAgent.browser.isEdge = goog.labs.userAgent.browser.matchEdgeHtml_;\n\n\n/**\n * @return {boolean} Whether the user's browser is Chromium based Edge.\n */\ngoog.labs.userAgent.browser.isEdgeChromium =\n    goog.labs.userAgent.browser.matchEdgeChromium_;\n\n/**\n * @return {boolean} Whether the user's browser is Chromium based Opera.\n */\ngoog.labs.userAgent.browser.isOperaChromium =\n    goog.labs.userAgent.browser.matchOperaChromium_;\n\n/**\n * @return {boolean} Whether the user's browser is Firefox.\n */\ngoog.labs.userAgent.browser.isFirefox =\n    goog.labs.userAgent.browser.matchFirefox_;\n\n\n/**\n * @return {boolean} Whether the user's browser is Safari.\n */\ngoog.labs.userAgent.browser.isSafari = goog.labs.userAgent.browser.matchSafari_;\n\n\n/**\n * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based\n *     iOS browser).\n */\ngoog.labs.userAgent.browser.isCoast = goog.labs.userAgent.browser.matchCoast_;\n\n\n/**\n * @return {boolean} Whether the user's browser is iOS Webview.\n */\ngoog.labs.userAgent.browser.isIosWebview =\n    goog.labs.userAgent.browser.matchIosWebview_;\n\n\n/**\n * @return {boolean} Whether the user's browser is any Chromium based browser (\n * Chrome, Blink-based Opera (15+) and Edge Chromium).\n */\ngoog.labs.userAgent.browser.isChrome = goog.labs.userAgent.browser.matchChrome_;\n\n\n/**\n * @return {boolean} Whether the user's browser is the Android browser.\n */\ngoog.labs.userAgent.browser.isAndroidBrowser =\n    goog.labs.userAgent.browser.matchAndroidBrowser_;\n\n\n/**\n * For more information, see:\n * http://docs.aws.amazon.com/silk/latest/developerguide/user-agent.html\n * @return {boolean} Whether the user's browser is Silk.\n */\ngoog.labs.userAgent.browser.isSilk = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Silk');\n};\n\n\n/**\n * @return {string} The browser version or empty string if version cannot be\n *     determined. Note that for Internet Explorer, this returns the version of\n *     the browser, not the version of the rendering engine. (IE 8 in\n *     compatibility mode will return 8.0 rather than 7.0. To determine the\n *     rendering engine version, look at document.documentMode instead. See\n *     http://msdn.microsoft.com/en-us/library/cc196988(v=vs.85).aspx for more\n *     details.)\n */\ngoog.labs.userAgent.browser.getVersion = function() {\n  var userAgentString = goog.labs.userAgent.util.getUserAgent();\n  // Special case IE since IE's version is inside the parenthesis and\n  // without the '/'.\n  if (goog.labs.userAgent.browser.isIE()) {\n    return goog.labs.userAgent.browser.getIEVersion_(userAgentString);\n  }\n\n  var versionTuples =\n      goog.labs.userAgent.util.extractVersionTuples(userAgentString);\n\n  // Construct a map for easy lookup.\n  var versionMap = {};\n  goog.array.forEach(versionTuples, function(tuple) {\n    // Note that the tuple is of length three, but we only care about the\n    // first two.\n    var key = tuple[0];\n    var value = tuple[1];\n    versionMap[key] = value;\n  });\n\n  var versionMapHasKey = goog.partial(goog.object.containsKey, versionMap);\n\n  // Gives the value with the first key it finds, otherwise empty string.\n  function lookUpValueWithKeys(keys) {\n    var key = goog.array.find(keys, versionMapHasKey);\n    return versionMap[key] || '';\n  }\n\n  // Check Opera before Chrome since Opera 15+ has \"Chrome\" in the string.\n  // See\n  // http://my.opera.com/ODIN/blog/2013/07/15/opera-user-agent-strings-opera-15-and-beyond\n  if (goog.labs.userAgent.browser.isOpera()) {\n    // Opera 10 has Version/10.0 but Opera/9.8, so look for \"Version\" first.\n    // Opera uses 'OPR' for more recent UAs.\n    return lookUpValueWithKeys(['Version', 'Opera']);\n  }\n\n  // Check Edge before Chrome since it has Chrome in the string.\n  if (goog.labs.userAgent.browser.isEdge()) {\n    return lookUpValueWithKeys(['Edge']);\n  }\n\n  // Check Chromium Edge before Chrome since it has Chrome in the string.\n  if (goog.labs.userAgent.browser.isEdgeChromium()) {\n    return lookUpValueWithKeys(['Edg']);\n  }\n\n  if (goog.labs.userAgent.browser.isChrome()) {\n    return lookUpValueWithKeys(['Chrome', 'CriOS', 'HeadlessChrome']);\n  }\n\n  // Usually products browser versions are in the third tuple after \"Mozilla\"\n  // and the engine.\n  var tuple = versionTuples[2];\n  return tuple && tuple[1] || '';\n};\n\n\n/**\n * @param {string|number} version The version to check.\n * @return {boolean} Whether the browser version is higher or the same as the\n *     given version.\n */\ngoog.labs.userAgent.browser.isVersionOrHigher = function(version) {\n  return goog.string.internal.compareVersions(\n             goog.labs.userAgent.browser.getVersion(), version) >= 0;\n};\n\n\n/**\n * Determines IE version. More information:\n * http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx#uaString\n * http://msdn.microsoft.com/en-us/library/hh869301(v=vs.85).aspx\n * http://blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx\n * http://blogs.msdn.com/b/ie/archive/2009/01/09/the-internet-explorer-8-user-agent-string-updated-edition.aspx\n *\n * @param {string} userAgent the User-Agent.\n * @return {string}\n * @private\n */\ngoog.labs.userAgent.browser.getIEVersion_ = function(userAgent) {\n  // IE11 may identify itself as MSIE 9.0 or MSIE 10.0 due to an IE 11 upgrade\n  // bug. Example UA:\n  // Mozilla/5.0 (MSIE 9.0; Windows NT 6.1; WOW64; Trident/7.0; rv:11.0)\n  // like Gecko.\n  // See http://www.whatismybrowser.com/developers/unknown-user-agent-fragments.\n  var rv = /rv: *([\\d\\.]*)/.exec(userAgent);\n  if (rv && rv[1]) {\n    return rv[1];\n  }\n\n  var version = '';\n  var msie = /MSIE +([\\d\\.]+)/.exec(userAgent);\n  if (msie && msie[1]) {\n    // IE in compatibility mode usually identifies itself as MSIE 7.0; in this\n    // case, use the Trident version to determine the version of IE. For more\n    // details, see the links above.\n    var tridentVersion = /Trident\\/(\\d.\\d)/.exec(userAgent);\n    if (msie[1] == '7.0') {\n      if (tridentVersion && tridentVersion[1]) {\n        switch (tridentVersion[1]) {\n          case '4.0':\n            version = '8.0';\n            break;\n          case '5.0':\n            version = '9.0';\n            break;\n          case '6.0':\n            version = '10.0';\n            break;\n          case '7.0':\n            version = '11.0';\n            break;\n        }\n      } else {\n        version = '7.0';\n      }\n    } else {\n      version = msie[1];\n    }\n  }\n  return version;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Closure user agent detection.\n * @see http://en.wikipedia.org/wiki/User_agent\n * For more information on browser brand, platform, or device see the other\n * sub-namespaces in goog.labs.userAgent (browser, platform, and device).\n */\n\ngoog.provide('goog.labs.userAgent.engine');\n\ngoog.require('goog.array');\ngoog.require('goog.labs.userAgent.util');\ngoog.require('goog.string');\n\n\n/**\n * @return {boolean} Whether the rendering engine is Presto.\n */\ngoog.labs.userAgent.engine.isPresto = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Presto');\n};\n\n\n/**\n * @return {boolean} Whether the rendering engine is Trident.\n */\ngoog.labs.userAgent.engine.isTrident = function() {\n  // IE only started including the Trident token in IE8.\n  return goog.labs.userAgent.util.matchUserAgent('Trident') ||\n      goog.labs.userAgent.util.matchUserAgent('MSIE');\n};\n\n\n/**\n * @return {boolean} Whether the rendering engine is EdgeHTML.\n */\ngoog.labs.userAgent.engine.isEdge = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Edge');\n};\n\n\n/**\n * @return {boolean} Whether the rendering engine is WebKit. This will return\n * true for Chrome, Blink-based Opera (15+), Edge Chromium and Safari.\n */\ngoog.labs.userAgent.engine.isWebKit = function() {\n  return goog.labs.userAgent.util.matchUserAgentIgnoreCase('WebKit') &&\n      !goog.labs.userAgent.engine.isEdge();\n};\n\n\n/**\n * @return {boolean} Whether the rendering engine is Gecko.\n */\ngoog.labs.userAgent.engine.isGecko = function() {\n  return goog.labs.userAgent.util.matchUserAgent('Gecko') &&\n      !goog.labs.userAgent.engine.isWebKit() &&\n      !goog.labs.userAgent.engine.isTrident() &&\n      !goog.labs.userAgent.engine.isEdge();\n};\n\n\n/**\n * @return {string} The rendering engine's version or empty string if version\n *     can't be determined.\n */\ngoog.labs.userAgent.engine.getVersion = function() {\n  var userAgentString = goog.labs.userAgent.util.getUserAgent();\n  if (userAgentString) {\n    var tuples = goog.labs.userAgent.util.extractVersionTuples(userAgentString);\n\n    var engineTuple = goog.labs.userAgent.engine.getEngineTuple_(tuples);\n    if (engineTuple) {\n      // In Gecko, the version string is either in the browser info or the\n      // Firefox version.  See Gecko user agent string reference:\n      // http://goo.gl/mULqa\n      if (engineTuple[0] == 'Gecko') {\n        return goog.labs.userAgent.engine.getVersionForKey_(tuples, 'Firefox');\n      }\n\n      return engineTuple[1];\n    }\n\n    // MSIE has only one version identifier, and the Trident version is\n    // specified in the parenthetical. IE Edge is covered in the engine tuple\n    // detection.\n    var browserTuple = tuples[0];\n    var info;\n    if (browserTuple && (info = browserTuple[2])) {\n      var match = /Trident\\/([^\\s;]+)/.exec(info);\n      if (match) {\n        return match[1];\n      }\n    }\n  }\n  return '';\n};\n\n\n/**\n * @param {!Array<!Array<string>>} tuples Extracted version tuples.\n * @return {!Array<string>|undefined} The engine tuple or undefined if not\n *     found.\n * @private\n */\ngoog.labs.userAgent.engine.getEngineTuple_ = function(tuples) {\n  if (!goog.labs.userAgent.engine.isEdge()) {\n    return tuples[1];\n  }\n  for (var i = 0; i < tuples.length; i++) {\n    var tuple = tuples[i];\n    if (tuple[0] == 'Edge') {\n      return tuple;\n    }\n  }\n};\n\n\n/**\n * @param {string|number} version The version to check.\n * @return {boolean} Whether the rendering engine version is higher or the same\n *     as the given version.\n */\ngoog.labs.userAgent.engine.isVersionOrHigher = function(version) {\n  return goog.string.compareVersions(\n             goog.labs.userAgent.engine.getVersion(), version) >= 0;\n};\n\n\n/**\n * @param {!Array<!Array<string>>} tuples Version tuples.\n * @param {string} key The key to look for.\n * @return {string} The version string of the given key, if present.\n *     Otherwise, the empty string.\n * @private\n */\ngoog.labs.userAgent.engine.getVersionForKey_ = function(tuples, key) {\n  // TODO(nnaze): Move to util if useful elsewhere.\n\n  var pair = goog.array.find(tuples, function(pair) { return key == pair[0]; });\n\n  return pair && pair[1] || '';\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Browser capability checks for the events package.\n */\n\n\ngoog.provide('goog.events.BrowserFeature');\n\ngoog.require('goog.userAgent');\ngoog.scope(function() {\n\n\n\n/**\n * Enum of browser capabilities.\n * @enum {boolean}\n */\ngoog.events.BrowserFeature = {\n  /**\n   * Whether the button attribute of the event is W3C compliant.  False in\n   * Internet Explorer prior to version 9; document-version dependent.\n   */\n  HAS_W3C_BUTTON:\n      !goog.userAgent.IE || goog.userAgent.isDocumentModeOrHigher(9),\n\n  /**\n   * Whether the browser supports full W3C event model.\n   */\n  HAS_W3C_EVENT_SUPPORT:\n      !goog.userAgent.IE || goog.userAgent.isDocumentModeOrHigher(9),\n\n  /**\n   * To prevent default in IE7-8 for certain keydown events we need set the\n   * keyCode to -1.\n   */\n  SET_KEY_CODE_TO_PREVENT_DEFAULT:\n      goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('9'),\n\n  /**\n   * Whether the `navigator.onLine` property is supported.\n   */\n  HAS_NAVIGATOR_ONLINE_PROPERTY:\n      !goog.userAgent.WEBKIT || goog.userAgent.isVersionOrHigher('528'),\n\n  /**\n   * Whether HTML5 network online/offline events are supported.\n   */\n  HAS_HTML5_NETWORK_EVENT_SUPPORT:\n      goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9b') ||\n      goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8') ||\n      goog.userAgent.OPERA && goog.userAgent.isVersionOrHigher('9.5') ||\n      goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('528'),\n\n  /**\n   * Whether HTML5 network events fire on document.body, or otherwise the\n   * window.\n   */\n  HTML5_NETWORK_EVENTS_FIRE_ON_BODY:\n      goog.userAgent.GECKO && !goog.userAgent.isVersionOrHigher('8') ||\n      goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('9'),\n\n  /**\n   * Whether touch is enabled in the browser.\n   */\n  TOUCH_ENABLED:\n      ('ontouchstart' in goog.global ||\n       !!(goog.global['document'] && document.documentElement &&\n          'ontouchstart' in document.documentElement) ||\n       // IE10 uses non-standard touch events, so it has a different check.\n       !!(goog.global['navigator'] &&\n          (goog.global['navigator']['maxTouchPoints'] ||\n           goog.global['navigator']['msMaxTouchPoints']))),\n\n  /**\n   * Whether addEventListener supports W3C standard pointer events.\n   * http://www.w3.org/TR/pointerevents/\n   */\n  POINTER_EVENTS: ('PointerEvent' in goog.global),\n\n  /**\n   * Whether addEventListener supports MSPointer events (only used in IE10).\n   * http://msdn.microsoft.com/en-us/library/ie/hh772103(v=vs.85).aspx\n   * http://msdn.microsoft.com/library/hh673557(v=vs.85).aspx\n   */\n  MSPOINTER_EVENTS:\n      ('MSPointerEvent' in goog.global &&\n       !!(goog.global['navigator'] &&\n          goog.global['navigator']['msPointerEnabled'])),\n\n  /**\n   * Whether addEventListener supports {passive: true}.\n   * https://developers.google.com/web/updates/2016/06/passive-event-listeners\n   */\n  PASSIVE_EVENTS: purify(function() {\n    // If we're in a web worker or other custom environment, we can't tell.\n    if (!goog.global.addEventListener || !Object.defineProperty) {  // IE 8\n      return false;\n    }\n\n    var passive = false;\n    var options = Object.defineProperty({}, 'passive', {\n      get: function() {\n        passive = true;\n      }\n    });\n    try {\n      goog.global.addEventListener('test', goog.nullFunction, options);\n      goog.global.removeEventListener('test', goog.nullFunction, options);\n    } catch (e) {\n    }\n\n    return passive;\n  })\n};\n\n\n/**\n * Tricks Closure Compiler into believing that a function is pure.  The compiler\n * assumes that any `valueOf` function is pure, without analyzing its contents.\n *\n * @param {function(): T} fn\n * @return {T}\n * @template T\n */\nfunction purify(fn) {\n  return ({valueOf: fn}).valueOf();\n}\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview A base class for event objects.\n */\n\n\ngoog.provide('goog.events.Event');\ngoog.provide('goog.events.EventLike');\n\n/**\n * goog.events.Event no longer depends on goog.Disposable. Keep requiring\n * goog.Disposable here to not break projects which assume this dependency.\n * @suppress {extraRequire}\n */\ngoog.require('goog.Disposable');\ngoog.require('goog.events.EventId');\n\n\n/**\n * A typedef for event like objects that are dispatchable via the\n * goog.events.dispatchEvent function. strings are treated as the type for a\n * goog.events.Event. Objects are treated as an extension of a new\n * goog.events.Event with the type property of the object being used as the type\n * of the Event.\n * @typedef {string|Object|goog.events.Event|goog.events.EventId}\n */\ngoog.events.EventLike;\n\n\n\n/**\n * A base class for event objects, so that they can support preventDefault and\n * stopPropagation.\n *\n * @param {string|!goog.events.EventId} type Event Type.\n * @param {Object=} opt_target Reference to the object that is the target of\n *     this event. It has to implement the `EventTarget` interface\n *     declared at {@link http://developer.mozilla.org/en/DOM/EventTarget}.\n * @constructor\n */\ngoog.events.Event = function(type, opt_target) {\n  /**\n   * Event type.\n   * @type {string}\n   */\n  this.type = type instanceof goog.events.EventId ? String(type) : type;\n\n  /**\n   * TODO(tbreisacher): The type should probably be\n   * EventTarget|goog.events.EventTarget.\n   *\n   * Target of the event.\n   * @type {Object|undefined}\n   */\n  this.target = opt_target;\n\n  /**\n   * Object that had the listener attached.\n   * @type {Object|undefined}\n   */\n  this.currentTarget = this.target;\n\n  /**\n   * Whether to cancel the event in internal capture/bubble processing for IE.\n   * @type {boolean}\n   * @private\n   */\n  this.propagationStopped_ = false;\n\n  /**\n   * Whether the default action has been prevented.\n   * This is a property to match the W3C specification at\n   * {@link http://www.w3.org/TR/DOM-Level-3-Events/\n   * #events-event-type-defaultPrevented}.\n   * Must be treated as read-only outside the class.\n   * @type {boolean}\n   */\n  this.defaultPrevented = false;\n};\n\n/**\n * @return {boolean} true iff internal propagation has been stopped.\n */\ngoog.events.Event.prototype.hasPropagationStopped = function() {\n  return this.propagationStopped_;\n};\n\n/**\n * Stops event propagation.\n */\ngoog.events.Event.prototype.stopPropagation = function() {\n  this.propagationStopped_ = true;\n};\n\n\n/**\n * Prevents the default action, for example a link redirecting to a url.\n */\ngoog.events.Event.prototype.preventDefault = function() {\n  this.defaultPrevented = true;\n};\n\n\n/**\n * Stops the propagation of the event. It is equivalent to\n * `e.stopPropagation()`, but can be used as the callback argument of\n * {@link goog.events.listen} without declaring another function.\n * @param {!goog.events.Event} e An event.\n */\ngoog.events.Event.stopPropagation = function(e) {\n  e.stopPropagation();\n};\n\n\n/**\n * Prevents the default action. It is equivalent to\n * `e.preventDefault()`, but can be used as the callback argument of\n * {@link goog.events.listen} without declaring another function.\n * @param {!goog.events.Event} e An event.\n */\ngoog.events.Event.preventDefault = function(e) {\n  e.preventDefault();\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview A patched, standardized event object for browser events.\n *\n * <pre>\n * The patched event object contains the following members:\n * - type           {string}    Event type, e.g. 'click'\n * - target         {Object}    The element that actually triggered the event\n * - currentTarget  {Object}    The element the listener is attached to\n * - relatedTarget  {Object}    For mouseover and mouseout, the previous object\n * - offsetX        {number}    X-coordinate relative to target\n * - offsetY        {number}    Y-coordinate relative to target\n * - clientX        {number}    X-coordinate relative to viewport\n * - clientY        {number}    Y-coordinate relative to viewport\n * - screenX        {number}    X-coordinate relative to the edge of the screen\n * - screenY        {number}    Y-coordinate relative to the edge of the screen\n * - button         {number}    Mouse button. Use isButton() to test.\n * - keyCode        {number}    Key-code\n * - ctrlKey        {boolean}   Was ctrl key depressed\n * - altKey         {boolean}   Was alt key depressed\n * - shiftKey       {boolean}   Was shift key depressed\n * - metaKey        {boolean}   Was meta key depressed\n * - pointerId      {number}    Pointer ID\n * - pointerType    {string}    Pointer type, e.g. 'mouse', 'pen', or 'touch'\n * - defaultPrevented {boolean} Whether the default action has been prevented\n * - state          {Object}    History state object\n *\n * NOTE: The keyCode member contains the raw browser keyCode. For normalized\n * key and character code use {@link goog.events.KeyHandler}.\n * </pre>\n */\n\ngoog.provide('goog.events.BrowserEvent');\ngoog.provide('goog.events.BrowserEvent.MouseButton');\ngoog.provide('goog.events.BrowserEvent.PointerType');\n\ngoog.require('goog.debug');\ngoog.require('goog.events.BrowserFeature');\ngoog.require('goog.events.Event');\ngoog.require('goog.events.EventType');\ngoog.require('goog.reflect');\ngoog.require('goog.userAgent');\n\n/**\n * @define {boolean} If true, use the layerX and layerY properties of a native\n * browser event over the offsetX and offsetY properties, which cause expensive\n * reflow. If layerX or layerY is not defined, offsetX and offsetY will be used\n * as usual.\n */\ngoog.events.USE_LAYER_XY_AS_OFFSET_XY =\n    goog.define('goog.events.USE_LAYER_XY_AS_OFFSET_XY', false);\n\n/**\n * Accepts a browser event object and creates a patched, cross browser event\n * object.\n * The content of this object will not be initialized if no event object is\n * provided. If this is the case, init() needs to be invoked separately.\n * @param {Event=} opt_e Browser event object.\n * @param {EventTarget=} opt_currentTarget Current target for event.\n * @constructor\n * @extends {goog.events.Event}\n */\ngoog.events.BrowserEvent = function(opt_e, opt_currentTarget) {\n  goog.events.BrowserEvent.base(this, 'constructor', opt_e ? opt_e.type : '');\n\n  /**\n   * Target that fired the event.\n   * @override\n   * @type {?Node}\n   */\n  this.target = null;\n\n  /**\n   * Node that had the listener attached.\n   * @override\n   * @type {?Node|undefined}\n   */\n  this.currentTarget = null;\n\n  /**\n   * For mouseover and mouseout events, the related object for the event.\n   * @type {?Node}\n   */\n  this.relatedTarget = null;\n\n  /**\n   * X-coordinate relative to target.\n   * @type {number}\n   */\n  this.offsetX = 0;\n\n  /**\n   * Y-coordinate relative to target.\n   * @type {number}\n   */\n  this.offsetY = 0;\n\n  /**\n   * X-coordinate relative to the window.\n   * @type {number}\n   */\n  this.clientX = 0;\n\n  /**\n   * Y-coordinate relative to the window.\n   * @type {number}\n   */\n  this.clientY = 0;\n\n  /**\n   * X-coordinate relative to the monitor.\n   * @type {number}\n   */\n  this.screenX = 0;\n\n  /**\n   * Y-coordinate relative to the monitor.\n   * @type {number}\n   */\n  this.screenY = 0;\n\n  /**\n   * Which mouse button was pressed.\n   * @type {number}\n   */\n  this.button = 0;\n\n  /**\n   * Key of key press.\n   * @type {string}\n   */\n  this.key = '';\n\n  /**\n   * Keycode of key press.\n   * @type {number}\n   */\n  this.keyCode = 0;\n\n  /**\n   * Keycode of key press.\n   * @type {number}\n   */\n  this.charCode = 0;\n\n  /**\n   * Whether control was pressed at time of event.\n   * @type {boolean}\n   */\n  this.ctrlKey = false;\n\n  /**\n   * Whether alt was pressed at time of event.\n   * @type {boolean}\n   */\n  this.altKey = false;\n\n  /**\n   * Whether shift was pressed at time of event.\n   * @type {boolean}\n   */\n  this.shiftKey = false;\n\n  /**\n   * Whether the meta key was pressed at time of event.\n   * @type {boolean}\n   */\n  this.metaKey = false;\n\n  /**\n   * History state object, only set for PopState events where it's a copy of the\n   * state object provided to pushState or replaceState.\n   * @type {?Object}\n   */\n  this.state = null;\n\n  /**\n   * Whether the default platform modifier key was pressed at time of event.\n   * (This is control for all platforms except Mac, where it's Meta.)\n   * @type {boolean}\n   */\n  this.platformModifierKey = false;\n\n  /**\n   * @type {number}\n   */\n  this.pointerId = 0;\n\n  /**\n   * @type {string}\n   */\n  this.pointerType = '';\n\n  /**\n   * The browser event object.\n   * @private {?Event}\n   */\n  this.event_ = null;\n\n  if (opt_e) {\n    this.init(opt_e, opt_currentTarget);\n  }\n};\ngoog.inherits(goog.events.BrowserEvent, goog.events.Event);\n\n\n/**\n * Normalized button constants for the mouse.\n * @enum {number}\n */\ngoog.events.BrowserEvent.MouseButton = {\n  LEFT: 0,\n  MIDDLE: 1,\n  RIGHT: 2\n};\n\n\n/**\n * Normalized pointer type constants for pointer events.\n * @enum {string}\n */\ngoog.events.BrowserEvent.PointerType = {\n  MOUSE: 'mouse',\n  PEN: 'pen',\n  TOUCH: 'touch'\n};\n\n\n/**\n * Static data for mapping mouse buttons.\n * @type {!Array<number>}\n * @deprecated Use `goog.events.BrowserEvent.IE_BUTTON_MAP` instead.\n */\ngoog.events.BrowserEvent.IEButtonMap = goog.debug.freeze([\n  1,  // LEFT\n  4,  // MIDDLE\n  2   // RIGHT\n]);\n\n\n/**\n * Static data for mapping mouse buttons.\n * @const {!Array<number>}\n */\ngoog.events.BrowserEvent.IE_BUTTON_MAP = goog.events.BrowserEvent.IEButtonMap;\n\n\n/**\n * Static data for mapping MSPointerEvent types to PointerEvent types.\n * @const {!Object<number, goog.events.BrowserEvent.PointerType>}\n */\ngoog.events.BrowserEvent.IE_POINTER_TYPE_MAP = goog.debug.freeze({\n  2: goog.events.BrowserEvent.PointerType.TOUCH,\n  3: goog.events.BrowserEvent.PointerType.PEN,\n  4: goog.events.BrowserEvent.PointerType.MOUSE\n});\n\n\n/**\n * Accepts a browser event object and creates a patched, cross browser event\n * object.\n * @param {Event} e Browser event object.\n * @param {EventTarget=} opt_currentTarget Current target for event.\n */\ngoog.events.BrowserEvent.prototype.init = function(e, opt_currentTarget) {\n  var type = this.type = e.type;\n\n  /**\n   * On touch devices use the first \"changed touch\" as the relevant touch.\n   * @type {?Touch}\n   */\n  var relevantTouch =\n      e.changedTouches && e.changedTouches.length ? e.changedTouches[0] : null;\n\n  // TODO(nicksantos): Change this.target to type EventTarget.\n  this.target = /** @type {Node} */ (e.target) || e.srcElement;\n\n  // TODO(nicksantos): Change this.currentTarget to type EventTarget.\n  this.currentTarget = /** @type {Node} */ (opt_currentTarget);\n\n  var relatedTarget = /** @type {Node} */ (e.relatedTarget);\n  if (relatedTarget) {\n    // There's a bug in FireFox where sometimes, relatedTarget will be a\n    // chrome element, and accessing any property of it will get a permission\n    // denied exception. See:\n    // https://bugzilla.mozilla.org/show_bug.cgi?id=497780\n    if (goog.userAgent.GECKO) {\n      if (!goog.reflect.canAccessProperty(relatedTarget, 'nodeName')) {\n        relatedTarget = null;\n      }\n    }\n  } else if (type == goog.events.EventType.MOUSEOVER) {\n    relatedTarget = e.fromElement;\n  } else if (type == goog.events.EventType.MOUSEOUT) {\n    relatedTarget = e.toElement;\n  }\n\n  this.relatedTarget = relatedTarget;\n\n  if (relevantTouch) {\n    this.clientX = relevantTouch.clientX !== undefined ? relevantTouch.clientX :\n                                                         relevantTouch.pageX;\n    this.clientY = relevantTouch.clientY !== undefined ? relevantTouch.clientY :\n                                                         relevantTouch.pageY;\n    this.screenX = relevantTouch.screenX || 0;\n    this.screenY = relevantTouch.screenY || 0;\n  } else {\n    if (goog.events.USE_LAYER_XY_AS_OFFSET_XY) {\n      this.offsetX = (e.layerX !== undefined) ? e.layerX : e.offsetX;\n      this.offsetY = (e.layerY !== undefined) ? e.layerY : e.offsetY;\n    } else {\n      // Webkit emits a lame warning whenever layerX/layerY is accessed.\n      // http://code.google.com/p/chromium/issues/detail?id=101733\n      this.offsetX = (goog.userAgent.WEBKIT || e.offsetX !== undefined) ?\n          e.offsetX :\n          e.layerX;\n      this.offsetY = (goog.userAgent.WEBKIT || e.offsetY !== undefined) ?\n          e.offsetY :\n          e.layerY;\n    }\n    this.clientX = e.clientX !== undefined ? e.clientX : e.pageX;\n    this.clientY = e.clientY !== undefined ? e.clientY : e.pageY;\n    this.screenX = e.screenX || 0;\n    this.screenY = e.screenY || 0;\n  }\n\n  this.button = e.button;\n\n  this.keyCode = e.keyCode || 0;\n  this.key = e.key || '';\n  this.charCode = e.charCode || (type == 'keypress' ? e.keyCode : 0);\n  this.ctrlKey = e.ctrlKey;\n  this.altKey = e.altKey;\n  this.shiftKey = e.shiftKey;\n  this.metaKey = e.metaKey;\n  this.platformModifierKey = goog.userAgent.MAC ? e.metaKey : e.ctrlKey;\n  this.pointerId = e.pointerId || 0;\n  this.pointerType = goog.events.BrowserEvent.getPointerType_(e);\n  this.state = e.state;\n  this.event_ = e;\n  if (e.defaultPrevented) {\n    this.preventDefault();\n  }\n};\n\n\n/**\n * Tests to see which button was pressed during the event. This is really only\n * useful in IE and Gecko browsers. And in IE, it's only useful for\n * mousedown/mouseup events, because click only fires for the left mouse button.\n *\n * Safari 2 only reports the left button being clicked, and uses the value '1'\n * instead of 0. Opera only reports a mousedown event for the middle button, and\n * no mouse events for the right button. Opera has default behavior for left and\n * middle click that can only be overridden via a configuration setting.\n *\n * There's a nice table of this mess at http://www.unixpapa.com/js/mouse.html.\n *\n * @param {goog.events.BrowserEvent.MouseButton} button The button\n *     to test for.\n * @return {boolean} True if button was pressed.\n */\ngoog.events.BrowserEvent.prototype.isButton = function(button) {\n  if (!goog.events.BrowserFeature.HAS_W3C_BUTTON) {\n    if (this.type == 'click') {\n      return button == goog.events.BrowserEvent.MouseButton.LEFT;\n    } else {\n      return !!(\n          this.event_.button & goog.events.BrowserEvent.IE_BUTTON_MAP[button]);\n    }\n  } else {\n    return this.event_.button == button;\n  }\n};\n\n\n/**\n * Whether this has an \"action\"-producing mouse button.\n *\n * By definition, this includes left-click on windows/linux, and left-click\n * without the ctrl key on Macs.\n *\n * @return {boolean} The result.\n */\ngoog.events.BrowserEvent.prototype.isMouseActionButton = function() {\n  // Webkit does not ctrl+click to be a right-click, so we\n  // normalize it to behave like Gecko and Opera.\n  return this.isButton(goog.events.BrowserEvent.MouseButton.LEFT) &&\n      !(goog.userAgent.WEBKIT && goog.userAgent.MAC && this.ctrlKey);\n};\n\n\n/**\n * @override\n */\ngoog.events.BrowserEvent.prototype.stopPropagation = function() {\n  goog.events.BrowserEvent.superClass_.stopPropagation.call(this);\n  if (this.event_.stopPropagation) {\n    this.event_.stopPropagation();\n  } else {\n    this.event_.cancelBubble = true;\n  }\n};\n\n\n/**\n * @override\n */\ngoog.events.BrowserEvent.prototype.preventDefault = function() {\n  goog.events.BrowserEvent.superClass_.preventDefault.call(this);\n  var be = this.event_;\n  if (!be.preventDefault) {\n    be.returnValue = false;\n    if (goog.events.BrowserFeature.SET_KEY_CODE_TO_PREVENT_DEFAULT) {\n\n      try {\n        // Most keys can be prevented using returnValue. Some special keys\n        // require setting the keyCode to -1 as well:\n        //\n        // In IE7:\n        // F3, F5, F10, F11, Ctrl+P, Crtl+O, Ctrl+F (these are taken from IE6)\n        //\n        // In IE8:\n        // Ctrl+P, Crtl+O, Ctrl+F (F1-F12 cannot be stopped through the event)\n        //\n        // We therefore do this for all function keys as well as when Ctrl key\n        // is pressed.\n        var VK_F1 = 112;\n        var VK_F12 = 123;\n        if (be.ctrlKey || be.keyCode >= VK_F1 && be.keyCode <= VK_F12) {\n          be.keyCode = -1;\n        }\n      } catch (ex) {\n        // IE throws an 'access denied' exception when trying to change\n        // keyCode in some situations (e.g. srcElement is input[type=file],\n        // or srcElement is an anchor tag rewritten by parent's innerHTML).\n        // Do nothing in this case.\n      }\n    }\n  } else {\n    be.preventDefault();\n  }\n};\n\n\n/**\n * @return {Event} The underlying browser event object.\n */\ngoog.events.BrowserEvent.prototype.getBrowserEvent = function() {\n  return this.event_;\n};\n\n\n/**\n * Extracts the pointer type from the given event.\n * @param {!Event} e\n * @return {string} The pointer type, e.g. 'mouse', 'pen', or 'touch'.\n * @private\n */\ngoog.events.BrowserEvent.getPointerType_ = function(e) {\n  if (typeof (e.pointerType) === 'string') {\n    return e.pointerType;\n  }\n  // IE10 uses integer codes for pointer type.\n  // https://msdn.microsoft.com/en-us/library/hh772359(v=vs.85).aspx\n  return goog.events.BrowserEvent.IE_POINTER_TYPE_MAP[e.pointerType] || '';\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Event Types.\n */\n\n\ngoog.provide('goog.events.EventType');\ngoog.provide('goog.events.MouseAsMouseEventType');\ngoog.provide('goog.events.MouseEvents');\ngoog.provide('goog.events.PointerAsMouseEventType');\ngoog.provide('goog.events.PointerAsTouchEventType');\ngoog.provide('goog.events.PointerFallbackEventType');\ngoog.provide('goog.events.PointerTouchFallbackEventType');\n\ngoog.require('goog.events.BrowserFeature');\ngoog.require('goog.userAgent');\n\n\n/**\n * Returns a prefixed event name for the current browser.\n * @param {string} eventName The name of the event.\n * @return {string} The prefixed event name.\n * @suppress {missingRequire|missingProvide}\n * @private\n */\ngoog.events.getVendorPrefixedName_ = function(eventName) {\n  return goog.userAgent.WEBKIT ?\n      'webkit' + eventName :\n      (goog.userAgent.OPERA ? 'o' + eventName.toLowerCase() :\n                              eventName.toLowerCase());\n};\n\n\n/**\n * Constants for event names.\n * @enum {string}\n */\ngoog.events.EventType = {\n  // Mouse events\n  CLICK: 'click',\n  RIGHTCLICK: 'rightclick',\n  DBLCLICK: 'dblclick',\n  AUXCLICK: 'auxclick',\n  MOUSEDOWN: 'mousedown',\n  MOUSEUP: 'mouseup',\n  MOUSEOVER: 'mouseover',\n  MOUSEOUT: 'mouseout',\n  MOUSEMOVE: 'mousemove',\n  MOUSEENTER: 'mouseenter',\n  MOUSELEAVE: 'mouseleave',\n\n  // Non-existent event; will never fire. This exists as a mouse counterpart to\n  // POINTERCANCEL.\n  MOUSECANCEL: 'mousecancel',\n\n  // Selection events.\n  // https://www.w3.org/TR/selection-api/\n  SELECTIONCHANGE: 'selectionchange',\n  SELECTSTART: 'selectstart',  // IE, Safari, Chrome\n\n  // Wheel events\n  // http://www.w3.org/TR/DOM-Level-3-Events/#events-wheelevents\n  WHEEL: 'wheel',\n\n  // Key events\n  KEYPRESS: 'keypress',\n  KEYDOWN: 'keydown',\n  KEYUP: 'keyup',\n\n  // Focus\n  BLUR: 'blur',\n  FOCUS: 'focus',\n  DEACTIVATE: 'deactivate',  // IE only\n  FOCUSIN: 'focusin',\n  FOCUSOUT: 'focusout',\n\n  // Forms\n  CHANGE: 'change',\n  RESET: 'reset',\n  SELECT: 'select',\n  SUBMIT: 'submit',\n  INPUT: 'input',\n  PROPERTYCHANGE: 'propertychange',  // IE only\n\n  // Drag and drop\n  DRAGSTART: 'dragstart',\n  DRAG: 'drag',\n  DRAGENTER: 'dragenter',\n  DRAGOVER: 'dragover',\n  DRAGLEAVE: 'dragleave',\n  DROP: 'drop',\n  DRAGEND: 'dragend',\n\n  // Touch events\n  // Note that other touch events exist, but we should follow the W3C list here.\n  // http://www.w3.org/TR/touch-events/#list-of-touchevent-types\n  TOUCHSTART: 'touchstart',\n  TOUCHMOVE: 'touchmove',\n  TOUCHEND: 'touchend',\n  TOUCHCANCEL: 'touchcancel',\n\n  // Misc\n  BEFOREUNLOAD: 'beforeunload',\n  CONSOLEMESSAGE: 'consolemessage',\n  CONTEXTMENU: 'contextmenu',\n  DEVICECHANGE: 'devicechange',\n  DEVICEMOTION: 'devicemotion',\n  DEVICEORIENTATION: 'deviceorientation',\n  DOMCONTENTLOADED: 'DOMContentLoaded',\n  ERROR: 'error',\n  HELP: 'help',\n  LOAD: 'load',\n  LOSECAPTURE: 'losecapture',\n  ORIENTATIONCHANGE: 'orientationchange',\n  READYSTATECHANGE: 'readystatechange',\n  RESIZE: 'resize',\n  SCROLL: 'scroll',\n  UNLOAD: 'unload',\n\n  // Media events\n  CANPLAY: 'canplay',\n  CANPLAYTHROUGH: 'canplaythrough',\n  DURATIONCHANGE: 'durationchange',\n  EMPTIED: 'emptied',\n  ENDED: 'ended',\n  LOADEDDATA: 'loadeddata',\n  LOADEDMETADATA: 'loadedmetadata',\n  PAUSE: 'pause',\n  PLAY: 'play',\n  PLAYING: 'playing',\n  PROGRESS: 'progress',\n  RATECHANGE: 'ratechange',\n  SEEKED: 'seeked',\n  SEEKING: 'seeking',\n  STALLED: 'stalled',\n  SUSPEND: 'suspend',\n  TIMEUPDATE: 'timeupdate',\n  VOLUMECHANGE: 'volumechange',\n  WAITING: 'waiting',\n\n  // Media Source Extensions events\n  // https://www.w3.org/TR/media-source/#mediasource-events\n  SOURCEOPEN: 'sourceopen',\n  SOURCEENDED: 'sourceended',\n  SOURCECLOSED: 'sourceclosed',\n  // https://www.w3.org/TR/media-source/#sourcebuffer-events\n  ABORT: 'abort',\n  UPDATE: 'update',\n  UPDATESTART: 'updatestart',\n  UPDATEEND: 'updateend',\n\n  // HTML 5 History events\n  // See http://www.w3.org/TR/html5/browsers.html#event-definitions-0\n  HASHCHANGE: 'hashchange',\n  PAGEHIDE: 'pagehide',\n  PAGESHOW: 'pageshow',\n  POPSTATE: 'popstate',\n\n  // Copy and Paste\n  // Support is limited. Make sure it works on your favorite browser\n  // before using.\n  // http://www.quirksmode.org/dom/events/cutcopypaste.html\n  COPY: 'copy',\n  PASTE: 'paste',\n  CUT: 'cut',\n  BEFORECOPY: 'beforecopy',\n  BEFORECUT: 'beforecut',\n  BEFOREPASTE: 'beforepaste',\n\n  // HTML5 online/offline events.\n  // http://www.w3.org/TR/offline-webapps/#related\n  ONLINE: 'online',\n  OFFLINE: 'offline',\n\n  // HTML 5 worker events\n  MESSAGE: 'message',\n  CONNECT: 'connect',\n\n  // Service Worker Events - ServiceWorkerGlobalScope context\n  // See https://w3c.github.io/ServiceWorker/#execution-context-events\n  // Note: message event defined in worker events section\n  INSTALL: 'install',\n  ACTIVATE: 'activate',\n  FETCH: 'fetch',\n  FOREIGNFETCH: 'foreignfetch',\n  MESSAGEERROR: 'messageerror',\n\n  // Service Worker Events - Document context\n  // See https://w3c.github.io/ServiceWorker/#document-context-events\n  STATECHANGE: 'statechange',\n  UPDATEFOUND: 'updatefound',\n  CONTROLLERCHANGE: 'controllerchange',\n\n  // CSS animation events.\n  /** @suppress {missingRequire} */\n  ANIMATIONSTART: goog.events.getVendorPrefixedName_('AnimationStart'),\n  /** @suppress {missingRequire} */\n  ANIMATIONEND: goog.events.getVendorPrefixedName_('AnimationEnd'),\n  /** @suppress {missingRequire} */\n  ANIMATIONITERATION: goog.events.getVendorPrefixedName_('AnimationIteration'),\n\n  // CSS transition events. Based on the browser support described at:\n  // https://developer.mozilla.org/en/css/css_transitions#Browser_compatibility\n  /** @suppress {missingRequire} */\n  TRANSITIONEND: goog.events.getVendorPrefixedName_('TransitionEnd'),\n\n  // W3C Pointer Events\n  // http://www.w3.org/TR/pointerevents/\n  POINTERDOWN: 'pointerdown',\n  POINTERUP: 'pointerup',\n  POINTERCANCEL: 'pointercancel',\n  POINTERMOVE: 'pointermove',\n  POINTEROVER: 'pointerover',\n  POINTEROUT: 'pointerout',\n  POINTERENTER: 'pointerenter',\n  POINTERLEAVE: 'pointerleave',\n  GOTPOINTERCAPTURE: 'gotpointercapture',\n  LOSTPOINTERCAPTURE: 'lostpointercapture',\n\n  // IE specific events.\n  // See http://msdn.microsoft.com/en-us/library/ie/hh772103(v=vs.85).aspx\n  // Note: these events will be supplanted in IE11.\n  MSGESTURECHANGE: 'MSGestureChange',\n  MSGESTUREEND: 'MSGestureEnd',\n  MSGESTUREHOLD: 'MSGestureHold',\n  MSGESTURESTART: 'MSGestureStart',\n  MSGESTURETAP: 'MSGestureTap',\n  MSGOTPOINTERCAPTURE: 'MSGotPointerCapture',\n  MSINERTIASTART: 'MSInertiaStart',\n  MSLOSTPOINTERCAPTURE: 'MSLostPointerCapture',\n  MSPOINTERCANCEL: 'MSPointerCancel',\n  MSPOINTERDOWN: 'MSPointerDown',\n  MSPOINTERENTER: 'MSPointerEnter',\n  MSPOINTERHOVER: 'MSPointerHover',\n  MSPOINTERLEAVE: 'MSPointerLeave',\n  MSPOINTERMOVE: 'MSPointerMove',\n  MSPOINTEROUT: 'MSPointerOut',\n  MSPOINTEROVER: 'MSPointerOver',\n  MSPOINTERUP: 'MSPointerUp',\n\n  // Native IMEs/input tools events.\n  TEXT: 'text',\n  // The textInput event is supported in IE9+, but only in lower case. All other\n  // browsers use the camel-case event name.\n  TEXTINPUT: goog.userAgent.IE ? 'textinput' : 'textInput',\n  COMPOSITIONSTART: 'compositionstart',\n  COMPOSITIONUPDATE: 'compositionupdate',\n  COMPOSITIONEND: 'compositionend',\n\n  // The beforeinput event is initially only supported in Safari. See\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=342670 for Chrome\n  // implementation tracking.\n  BEFOREINPUT: 'beforeinput',\n\n  // Webview tag events\n  // See https://developer.chrome.com/apps/tags/webview\n  EXIT: 'exit',\n  LOADABORT: 'loadabort',\n  LOADCOMMIT: 'loadcommit',\n  LOADREDIRECT: 'loadredirect',\n  LOADSTART: 'loadstart',\n  LOADSTOP: 'loadstop',\n  RESPONSIVE: 'responsive',\n  SIZECHANGED: 'sizechanged',\n  UNRESPONSIVE: 'unresponsive',\n\n  // HTML5 Page Visibility API.  See details at\n  // `goog.labs.dom.PageVisibilityMonitor`.\n  VISIBILITYCHANGE: 'visibilitychange',\n\n  // LocalStorage event.\n  STORAGE: 'storage',\n\n  // DOM Level 2 mutation events (deprecated).\n  DOMSUBTREEMODIFIED: 'DOMSubtreeModified',\n  DOMNODEINSERTED: 'DOMNodeInserted',\n  DOMNODEREMOVED: 'DOMNodeRemoved',\n  DOMNODEREMOVEDFROMDOCUMENT: 'DOMNodeRemovedFromDocument',\n  DOMNODEINSERTEDINTODOCUMENT: 'DOMNodeInsertedIntoDocument',\n  DOMATTRMODIFIED: 'DOMAttrModified',\n  DOMCHARACTERDATAMODIFIED: 'DOMCharacterDataModified',\n\n  // Print events.\n  BEFOREPRINT: 'beforeprint',\n  AFTERPRINT: 'afterprint',\n\n  // Web app manifest events.\n  BEFOREINSTALLPROMPT: 'beforeinstallprompt',\n  APPINSTALLED: 'appinstalled'\n};\n\n\n/**\n * Returns one of the given pointer fallback event names in order of preference:\n *   1. pointerEventName\n *   2. msPointerEventName\n *   3. fallbackEventName\n * @param {string} pointerEventName\n * @param {string} msPointerEventName\n * @param {string} fallbackEventName\n * @return {string} The supported pointer or fallback (mouse or touch) event\n *     name.\n * @private\n */\ngoog.events.getPointerFallbackEventName_ = function(\n    pointerEventName, msPointerEventName, fallbackEventName) {\n  if (goog.events.BrowserFeature.POINTER_EVENTS) {\n    return pointerEventName;\n  }\n  if (goog.events.BrowserFeature.MSPOINTER_EVENTS) {\n    return msPointerEventName;\n  }\n  return fallbackEventName;\n};\n\n\n/**\n * Constants for pointer event names that fall back to corresponding mouse event\n * names on unsupported platforms. These are intended to be drop-in replacements\n * for corresponding values in `goog.events.EventType`.\n * @enum {string}\n */\ngoog.events.PointerFallbackEventType = {\n  POINTERDOWN: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERDOWN, goog.events.EventType.MSPOINTERDOWN,\n      goog.events.EventType.MOUSEDOWN),\n  POINTERUP: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERUP, goog.events.EventType.MSPOINTERUP,\n      goog.events.EventType.MOUSEUP),\n  POINTERCANCEL: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERCANCEL,\n      goog.events.EventType.MSPOINTERCANCEL,\n      // When falling back to mouse events, there is no MOUSECANCEL equivalent\n      // of POINTERCANCEL. In this case POINTERUP already falls back to MOUSEUP\n      // which represents both UP and CANCEL. POINTERCANCEL does not fall back\n      // to MOUSEUP to prevent listening twice on the same event.\n      goog.events.EventType.MOUSECANCEL),\n  POINTERMOVE: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERMOVE, goog.events.EventType.MSPOINTERMOVE,\n      goog.events.EventType.MOUSEMOVE),\n  POINTEROVER: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTEROVER, goog.events.EventType.MSPOINTEROVER,\n      goog.events.EventType.MOUSEOVER),\n  POINTEROUT: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTEROUT, goog.events.EventType.MSPOINTEROUT,\n      goog.events.EventType.MOUSEOUT),\n  POINTERENTER: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERENTER, goog.events.EventType.MSPOINTERENTER,\n      goog.events.EventType.MOUSEENTER),\n  POINTERLEAVE: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERLEAVE, goog.events.EventType.MSPOINTERLEAVE,\n      goog.events.EventType.MOUSELEAVE)\n};\n\n\n/**\n * Constants for pointer event names that fall back to corresponding touch event\n * names on unsupported platforms. These are intended to be drop-in replacements\n * for corresponding values in `goog.events.EventType`.\n * @enum {string}\n */\ngoog.events.PointerTouchFallbackEventType = {\n  POINTERDOWN: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERDOWN, goog.events.EventType.MSPOINTERDOWN,\n      goog.events.EventType.TOUCHSTART),\n  POINTERUP: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERUP, goog.events.EventType.MSPOINTERUP,\n      goog.events.EventType.TOUCHEND),\n  POINTERCANCEL: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERCANCEL,\n      goog.events.EventType.MSPOINTERCANCEL, goog.events.EventType.TOUCHCANCEL),\n  POINTERMOVE: goog.events.getPointerFallbackEventName_(\n      goog.events.EventType.POINTERMOVE, goog.events.EventType.MSPOINTERMOVE,\n      goog.events.EventType.TOUCHMOVE)\n};\n\n\n/**\n * Mapping of mouse event names to underlying browser event names.\n * @typedef {{\n *     MOUSEDOWN: string,\n *     MOUSEUP: string,\n *     MOUSECANCEL:string,\n *     MOUSEMOVE:string,\n *     MOUSEOVER:string,\n *     MOUSEOUT:string,\n *     MOUSEENTER:string,\n *     MOUSELEAVE: string,\n * }}\n */\ngoog.events.MouseEvents;\n\n\n/**\n * An alias for `goog.events.EventType.MOUSE*` event types that is overridden by\n * corresponding `POINTER*` event types.\n * @const {!goog.events.MouseEvents}\n */\ngoog.events.PointerAsMouseEventType = {\n  MOUSEDOWN: goog.events.PointerFallbackEventType.POINTERDOWN,\n  MOUSEUP: goog.events.PointerFallbackEventType.POINTERUP,\n  MOUSECANCEL: goog.events.PointerFallbackEventType.POINTERCANCEL,\n  MOUSEMOVE: goog.events.PointerFallbackEventType.POINTERMOVE,\n  MOUSEOVER: goog.events.PointerFallbackEventType.POINTEROVER,\n  MOUSEOUT: goog.events.PointerFallbackEventType.POINTEROUT,\n  MOUSEENTER: goog.events.PointerFallbackEventType.POINTERENTER,\n  MOUSELEAVE: goog.events.PointerFallbackEventType.POINTERLEAVE\n};\n\n\n/**\n * An alias for `goog.events.EventType.MOUSE*` event types that continue to use\n * mouse events.\n * @const {!goog.events.MouseEvents}\n */\ngoog.events.MouseAsMouseEventType = {\n  MOUSEDOWN: goog.events.EventType.MOUSEDOWN,\n  MOUSEUP: goog.events.EventType.MOUSEUP,\n  MOUSECANCEL: goog.events.EventType.MOUSECANCEL,\n  MOUSEMOVE: goog.events.EventType.MOUSEMOVE,\n  MOUSEOVER: goog.events.EventType.MOUSEOVER,\n  MOUSEOUT: goog.events.EventType.MOUSEOUT,\n  MOUSEENTER: goog.events.EventType.MOUSEENTER,\n  MOUSELEAVE: goog.events.EventType.MOUSELEAVE\n};\n\n\n/**\n * An alias for `goog.events.EventType.TOUCH*` event types that is overridden by\n * corresponding `POINTER*` event types.\n * @enum {string}\n */\ngoog.events.PointerAsTouchEventType = {\n  TOUCHCANCEL: goog.events.PointerTouchFallbackEventType.POINTERCANCEL,\n  TOUCHEND: goog.events.PointerTouchFallbackEventType.POINTERUP,\n  TOUCHMOVE: goog.events.PointerTouchFallbackEventType.POINTERMOVE,\n  TOUCHSTART: goog.events.PointerTouchFallbackEventType.POINTERDOWN\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview An interface for a listenable JavaScript object.\n */\n\ngoog.provide('goog.events.Listenable');\ngoog.provide('goog.events.ListenableKey');\n/** @suppress {extraRequire} */\ngoog.require('goog.events.EventId');\n\ngoog.requireType('goog.events.EventLike');\n\n\n/**\n * A listenable interface. A listenable is an object with the ability\n * to dispatch/broadcast events to \"event listeners\" registered via\n * listen/listenOnce.\n *\n * The interface allows for an event propagation mechanism similar\n * to one offered by native browser event targets, such as\n * capture/bubble mechanism, stopping propagation, and preventing\n * default actions. Capture/bubble mechanism depends on the ancestor\n * tree constructed via `#getParentEventTarget`; this tree\n * must be directed acyclic graph. The meaning of default action(s)\n * in preventDefault is specific to a particular use case.\n *\n * Implementations that do not support capture/bubble or can not have\n * a parent listenable can simply not implement any ability to set the\n * parent listenable (and have `#getParentEventTarget` return\n * null).\n *\n * Implementation of this class can be used with or independently from\n * goog.events.\n *\n * Implementation must call `#addImplementation(implClass)`.\n *\n * @interface\n * @see goog.events\n * @see http://www.w3.org/TR/DOM-Level-2-Events/events.html\n */\ngoog.events.Listenable = function() {};\n\n\n/**\n * An expando property to indicate that an object implements\n * goog.events.Listenable.\n *\n * See addImplementation/isImplementedBy.\n *\n * @type {string}\n * @const\n */\ngoog.events.Listenable.IMPLEMENTED_BY_PROP =\n    'closure_listenable_' + ((Math.random() * 1e6) | 0);\n\n\n/**\n * Marks a given class (constructor) as an implementation of\n * Listenable, so that we can query that fact at runtime. The class\n * must have already implemented the interface.\n * @param {function(new:goog.events.Listenable,...)} cls The class constructor.\n *     The corresponding class must have already implemented the interface.\n */\ngoog.events.Listenable.addImplementation = function(cls) {\n  cls.prototype[goog.events.Listenable.IMPLEMENTED_BY_PROP] = true;\n};\n\n\n/**\n * @param {Object} obj The object to check.\n * @return {boolean} Whether a given instance implements Listenable. The\n *     class/superclass of the instance must call addImplementation.\n */\ngoog.events.Listenable.isImplementedBy = function(obj) {\n  return !!(obj && obj[goog.events.Listenable.IMPLEMENTED_BY_PROP]);\n};\n\n\n/**\n * Adds an event listener. A listener can only be added once to an\n * object and if it is added again the key for the listener is\n * returned. Note that if the existing listener is a one-off listener\n * (registered via listenOnce), it will no longer be a one-off\n * listener after a call to listen().\n *\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.\n * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback\n *     method.\n * @param {boolean=} opt_useCapture Whether to fire in capture phase\n *     (defaults to false).\n * @param {SCOPE=} opt_listenerScope Object in whose scope to call the\n *     listener.\n * @return {!goog.events.ListenableKey} Unique key for the listener.\n * @template SCOPE,EVENTOBJ\n */\ngoog.events.Listenable.prototype.listen;\n\n\n/**\n * Adds an event listener that is removed automatically after the\n * listener fired once.\n *\n * If an existing listener already exists, listenOnce will do\n * nothing. In particular, if the listener was previously registered\n * via listen(), listenOnce() will not turn the listener into a\n * one-off listener. Similarly, if there is already an existing\n * one-off listener, listenOnce does not modify the listeners (it is\n * still a once listener).\n *\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.\n * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback\n *     method.\n * @param {boolean=} opt_useCapture Whether to fire in capture phase\n *     (defaults to false).\n * @param {SCOPE=} opt_listenerScope Object in whose scope to call the\n *     listener.\n * @return {!goog.events.ListenableKey} Unique key for the listener.\n * @template SCOPE,EVENTOBJ\n */\ngoog.events.Listenable.prototype.listenOnce;\n\n\n/**\n * Removes an event listener which was added with listen() or listenOnce().\n *\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.\n * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback\n *     method.\n * @param {boolean=} opt_useCapture Whether to fire in capture phase\n *     (defaults to false).\n * @param {SCOPE=} opt_listenerScope Object in whose scope to call\n *     the listener.\n * @return {boolean} Whether any listener was removed.\n * @template SCOPE,EVENTOBJ\n */\ngoog.events.Listenable.prototype.unlisten;\n\n\n/**\n * Removes an event listener which was added with listen() by the key\n * returned by listen().\n *\n * @param {!goog.events.ListenableKey} key The key returned by\n *     listen() or listenOnce().\n * @return {boolean} Whether any listener was removed.\n */\ngoog.events.Listenable.prototype.unlistenByKey;\n\n\n/**\n * Dispatches an event (or event like object) and calls all listeners\n * listening for events of this type. The type of the event is decided by the\n * type property on the event object.\n *\n * If any of the listeners returns false OR calls preventDefault then this\n * function will return false.  If one of the capture listeners calls\n * stopPropagation, then the bubble listeners won't fire.\n *\n * @param {goog.events.EventLike} e Event object.\n * @return {boolean} If anyone called preventDefault on the event object (or\n *     if any of the listeners returns false) this will also return false.\n */\ngoog.events.Listenable.prototype.dispatchEvent;\n\n\n/**\n * Removes all listeners from this listenable. If type is specified,\n * it will only remove listeners of the particular type. otherwise all\n * registered listeners will be removed.\n *\n * @param {string=} opt_type Type of event to remove, default is to\n *     remove all types.\n * @return {number} Number of listeners removed.\n */\ngoog.events.Listenable.prototype.removeAllListeners;\n\n\n/**\n * Returns the parent of this event target to use for capture/bubble\n * mechanism.\n *\n * NOTE(chrishenry): The name reflects the original implementation of\n * custom event target (`goog.events.EventTarget`). We decided\n * that changing the name is not worth it.\n *\n * @return {goog.events.Listenable} The parent EventTarget or null if\n *     there is no parent.\n */\ngoog.events.Listenable.prototype.getParentEventTarget;\n\n\n/**\n * Fires all registered listeners in this listenable for the given\n * type and capture mode, passing them the given eventObject. This\n * does not perform actual capture/bubble. Only implementors of the\n * interface should be using this.\n *\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The type of the\n *     listeners to fire.\n * @param {boolean} capture The capture mode of the listeners to fire.\n * @param {EVENTOBJ} eventObject The event object to fire.\n * @return {boolean} Whether all listeners succeeded without\n *     attempting to prevent default behavior. If any listener returns\n *     false or called goog.events.Event#preventDefault, this returns\n *     false.\n * @template EVENTOBJ\n */\ngoog.events.Listenable.prototype.fireListeners;\n\n\n/**\n * Gets all listeners in this listenable for the given type and\n * capture mode.\n *\n * @param {string|!goog.events.EventId} type The type of the listeners to fire.\n * @param {boolean} capture The capture mode of the listeners to fire.\n * @return {!Array<!goog.events.ListenableKey>} An array of registered\n *     listeners.\n * @template EVENTOBJ\n */\ngoog.events.Listenable.prototype.getListeners;\n\n\n/**\n * Gets the goog.events.ListenableKey for the event or null if no such\n * listener is in use.\n *\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The name of the event\n *     without the 'on' prefix.\n * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener The\n *     listener function to get.\n * @param {boolean} capture Whether the listener is a capturing listener.\n * @param {SCOPE=} opt_listenerScope Object in whose scope to call the\n *     listener.\n * @return {goog.events.ListenableKey} the found listener or null if not found.\n * @template SCOPE,EVENTOBJ\n */\ngoog.events.Listenable.prototype.getListener;\n\n\n/**\n * Whether there is any active listeners matching the specified\n * signature. If either the type or capture parameters are\n * unspecified, the function will match on the remaining criteria.\n *\n * @param {string|!goog.events.EventId<EVENTOBJ>=} opt_type Event type.\n * @param {boolean=} opt_capture Whether to check for capture or bubble\n *     listeners.\n * @return {boolean} Whether there is any active listeners matching\n *     the requested type and/or capture phase.\n * @template EVENTOBJ\n */\ngoog.events.Listenable.prototype.hasListener;\n\n\n\n/**\n * An interface that describes a single registered listener.\n * @interface\n */\ngoog.events.ListenableKey = function() {};\n\n\n/**\n * Counter used to create a unique key\n * @type {number}\n * @private\n */\ngoog.events.ListenableKey.counter_ = 0;\n\n\n/**\n * Reserves a key to be used for ListenableKey#key field.\n * @return {number} A number to be used to fill ListenableKey#key\n *     field.\n */\ngoog.events.ListenableKey.reserveKey = function() {\n  return ++goog.events.ListenableKey.counter_;\n};\n\n\n/**\n * The source event target.\n * @type {?Object|?goog.events.Listenable}\n */\ngoog.events.ListenableKey.prototype.src;\n\n\n/**\n * The event type the listener is listening to.\n * @type {string}\n */\ngoog.events.ListenableKey.prototype.type;\n\n\n/**\n * The listener function.\n * @type {function(?):?|{handleEvent:function(?):?}|null}\n */\ngoog.events.ListenableKey.prototype.listener;\n\n\n/**\n * Whether the listener works on capture phase.\n * @type {boolean}\n */\ngoog.events.ListenableKey.prototype.capture;\n\n\n/**\n * The 'this' object for the listener function's scope.\n * @type {Object|undefined}\n */\ngoog.events.ListenableKey.prototype.handler;\n\n\n/**\n * A globally unique number to identify the key.\n * @type {number}\n */\ngoog.events.ListenableKey.prototype.key;\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Listener object.\n * @see ../demos/events.html\n */\n\ngoog.provide('goog.events.Listener');\n\ngoog.require('goog.events.ListenableKey');\n\n\n\n/**\n * Simple class that stores information about a listener\n * @param {function(?):?} listener Callback function.\n * @param {Function} proxy Wrapper for the listener that patches the event.\n * @param {EventTarget|goog.events.Listenable} src Source object for\n *     the event.\n * @param {string} type Event type.\n * @param {boolean} capture Whether in capture or bubble phase.\n * @param {Object=} opt_handler Object in whose context to execute the callback.\n * @implements {goog.events.ListenableKey}\n * @constructor\n */\ngoog.events.Listener = function(\n    listener, proxy, src, type, capture, opt_handler) {\n  if (goog.events.Listener.ENABLE_MONITORING) {\n    this.creationStack = new Error().stack;\n  }\n\n  /** @override */\n  this.listener = listener;\n\n  /**\n   * A wrapper over the original listener. This is used solely to\n   * handle native browser events (it is used to simulate the capture\n   * phase and to patch the event object).\n   * @type {Function}\n   */\n  this.proxy = proxy;\n\n  /**\n   * Object or node that callback is listening to\n   * @type {EventTarget|goog.events.Listenable}\n   */\n  this.src = src;\n\n  /**\n   * The event type.\n   * @const {string}\n   */\n  this.type = type;\n\n  /**\n   * Whether the listener is being called in the capture or bubble phase\n   * @const {boolean}\n   */\n  this.capture = !!capture;\n\n  /**\n   * Optional object whose context to execute the listener in\n   * @type {Object|undefined}\n   */\n  this.handler = opt_handler;\n\n  /**\n   * The key of the listener.\n   * @const {number}\n   * @override\n   */\n  this.key = goog.events.ListenableKey.reserveKey();\n\n  /**\n   * Whether to remove the listener after it has been called.\n   * @type {boolean}\n   */\n  this.callOnce = false;\n\n  /**\n   * Whether the listener has been removed.\n   * @type {boolean}\n   */\n  this.removed = false;\n};\n\n\n/**\n * @define {boolean} Whether to enable the monitoring of the\n *     goog.events.Listener instances. Switching on the monitoring is only\n *     recommended for debugging because it has a significant impact on\n *     performance and memory usage. If switched off, the monitoring code\n *     compiles down to 0 bytes.\n */\ngoog.events.Listener.ENABLE_MONITORING =\n    goog.define('goog.events.Listener.ENABLE_MONITORING', false);\n\n\n/**\n * If monitoring the goog.events.Listener instances is enabled, stores the\n * creation stack trace of the Disposable instance.\n * @type {string}\n */\ngoog.events.Listener.prototype.creationStack;\n\n\n/**\n * Marks this listener as removed. This also remove references held by\n * this listener object (such as listener and event source).\n */\ngoog.events.Listener.prototype.markAsRemoved = function() {\n  this.removed = true;\n  this.listener = null;\n  this.proxy = null;\n  this.src = null;\n  this.handler = null;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview A map of listeners that provides utility functions to\n * deal with listeners on an event target. Used by\n * `goog.events.EventTarget`.\n *\n * WARNING: Do not use this class from outside goog.events package.\n *\n */\n\ngoog.provide('goog.events.ListenerMap');\n\ngoog.require('goog.array');\ngoog.require('goog.events.Listener');\ngoog.require('goog.object');\n\n\n\n/**\n * Creates a new listener map.\n * @param {EventTarget|goog.events.Listenable} src The src object.\n * @constructor\n * @final\n */\ngoog.events.ListenerMap = function(src) {\n  /** @type {EventTarget|goog.events.Listenable} */\n  this.src = src;\n\n  /**\n   * Maps of event type to an array of listeners.\n   * @type {!Object<string, !Array<!goog.events.Listener>>}\n   */\n  this.listeners = {};\n\n  /**\n   * The count of types in this map that have registered listeners.\n   * @private {number}\n   */\n  this.typeCount_ = 0;\n};\n\n\n/**\n * @return {number} The count of event types in this map that actually\n *     have registered listeners.\n */\ngoog.events.ListenerMap.prototype.getTypeCount = function() {\n  return this.typeCount_;\n};\n\n\n/**\n * @return {number} Total number of registered listeners.\n */\ngoog.events.ListenerMap.prototype.getListenerCount = function() {\n  var count = 0;\n  for (var type in this.listeners) {\n    count += this.listeners[type].length;\n  }\n  return count;\n};\n\n\n/**\n * Adds an event listener. A listener can only be added once to an\n * object and if it is added again the key for the listener is\n * returned.\n *\n * Note that a one-off listener will not change an existing listener,\n * if any. On the other hand a normal listener will change existing\n * one-off listener to become a normal listener.\n *\n * @param {string|!goog.events.EventId} type The listener event type.\n * @param {!Function} listener This listener callback method.\n * @param {boolean} callOnce Whether the listener is a one-off\n *     listener.\n * @param {boolean=} opt_useCapture The capture mode of the listener.\n * @param {Object=} opt_listenerScope Object in whose scope to call the\n *     listener.\n * @return {!goog.events.ListenableKey} Unique key for the listener.\n */\ngoog.events.ListenerMap.prototype.add = function(\n    type, listener, callOnce, opt_useCapture, opt_listenerScope) {\n  var typeStr = type.toString();\n  var listenerArray = this.listeners[typeStr];\n  if (!listenerArray) {\n    listenerArray = this.listeners[typeStr] = [];\n    this.typeCount_++;\n  }\n\n  var listenerObj;\n  var index = goog.events.ListenerMap.findListenerIndex_(\n      listenerArray, listener, opt_useCapture, opt_listenerScope);\n  if (index > -1) {\n    listenerObj = listenerArray[index];\n    if (!callOnce) {\n      // Ensure that, if there is an existing callOnce listener, it is no\n      // longer a callOnce listener.\n      listenerObj.callOnce = false;\n    }\n  } else {\n    listenerObj = new goog.events.Listener(\n        listener, null, this.src, typeStr, !!opt_useCapture, opt_listenerScope);\n    listenerObj.callOnce = callOnce;\n    listenerArray.push(listenerObj);\n  }\n  return listenerObj;\n};\n\n\n/**\n * Removes a matching listener.\n * @param {string|!goog.events.EventId} type The listener event type.\n * @param {!Function} listener This listener callback method.\n * @param {boolean=} opt_useCapture The capture mode of the listener.\n * @param {Object=} opt_listenerScope Object in whose scope to call the\n *     listener.\n * @return {boolean} Whether any listener was removed.\n */\ngoog.events.ListenerMap.prototype.remove = function(\n    type, listener, opt_useCapture, opt_listenerScope) {\n  var typeStr = type.toString();\n  if (!(typeStr in this.listeners)) {\n    return false;\n  }\n\n  var listenerArray = this.listeners[typeStr];\n  var index = goog.events.ListenerMap.findListenerIndex_(\n      listenerArray, listener, opt_useCapture, opt_listenerScope);\n  if (index > -1) {\n    var listenerObj = listenerArray[index];\n    listenerObj.markAsRemoved();\n    goog.array.removeAt(listenerArray, index);\n    if (listenerArray.length == 0) {\n      delete this.listeners[typeStr];\n      this.typeCount_--;\n    }\n    return true;\n  }\n  return false;\n};\n\n\n/**\n * Removes the given listener object.\n * @param {!goog.events.ListenableKey} listener The listener to remove.\n * @return {boolean} Whether the listener is removed.\n */\ngoog.events.ListenerMap.prototype.removeByKey = function(listener) {\n  var type = listener.type;\n  if (!(type in this.listeners)) {\n    return false;\n  }\n\n  var removed = goog.array.remove(this.listeners[type], listener);\n  if (removed) {\n    /** @type {!goog.events.Listener} */ (listener).markAsRemoved();\n    if (this.listeners[type].length == 0) {\n      delete this.listeners[type];\n      this.typeCount_--;\n    }\n  }\n  return removed;\n};\n\n\n/**\n * Removes all listeners from this map. If opt_type is provided, only\n * listeners that match the given type are removed.\n * @param {string|!goog.events.EventId=} opt_type Type of event to remove.\n * @return {number} Number of listeners removed.\n */\ngoog.events.ListenerMap.prototype.removeAll = function(opt_type) {\n  var typeStr = opt_type && opt_type.toString();\n  var count = 0;\n  for (var type in this.listeners) {\n    if (!typeStr || type == typeStr) {\n      var listenerArray = this.listeners[type];\n      for (var i = 0; i < listenerArray.length; i++) {\n        ++count;\n        listenerArray[i].markAsRemoved();\n      }\n      delete this.listeners[type];\n      this.typeCount_--;\n    }\n  }\n  return count;\n};\n\n\n/**\n * Gets all listeners that match the given type and capture mode. The\n * returned array is a copy (but the listener objects are not).\n * @param {string|!goog.events.EventId} type The type of the listeners\n *     to retrieve.\n * @param {boolean} capture The capture mode of the listeners to retrieve.\n * @return {!Array<!goog.events.ListenableKey>} An array of matching\n *     listeners.\n */\ngoog.events.ListenerMap.prototype.getListeners = function(type, capture) {\n  var listenerArray = this.listeners[type.toString()];\n  var rv = [];\n  if (listenerArray) {\n    for (var i = 0; i < listenerArray.length; ++i) {\n      var listenerObj = listenerArray[i];\n      if (listenerObj.capture == capture) {\n        rv.push(listenerObj);\n      }\n    }\n  }\n  return rv;\n};\n\n\n/**\n * Gets the goog.events.ListenableKey for the event or null if no such\n * listener is in use.\n *\n * @param {string|!goog.events.EventId} type The type of the listener\n *     to retrieve.\n * @param {!Function} listener The listener function to get.\n * @param {boolean} capture Whether the listener is a capturing listener.\n * @param {Object=} opt_listenerScope Object in whose scope to call the\n *     listener.\n * @return {goog.events.ListenableKey} the found listener or null if not found.\n */\ngoog.events.ListenerMap.prototype.getListener = function(\n    type, listener, capture, opt_listenerScope) {\n  var listenerArray = this.listeners[type.toString()];\n  var i = -1;\n  if (listenerArray) {\n    i = goog.events.ListenerMap.findListenerIndex_(\n        listenerArray, listener, capture, opt_listenerScope);\n  }\n  return i > -1 ? listenerArray[i] : null;\n};\n\n\n/**\n * Whether there is a matching listener. If either the type or capture\n * parameters are unspecified, the function will match on the\n * remaining criteria.\n *\n * @param {string|!goog.events.EventId=} opt_type The type of the listener.\n * @param {boolean=} opt_capture The capture mode of the listener.\n * @return {boolean} Whether there is an active listener matching\n *     the requested type and/or capture phase.\n */\ngoog.events.ListenerMap.prototype.hasListener = function(\n    opt_type, opt_capture) {\n  var hasType = (opt_type !== undefined);\n  var typeStr = hasType ? opt_type.toString() : '';\n  var hasCapture = (opt_capture !== undefined);\n\n  return goog.object.some(this.listeners, function(listenerArray, type) {\n    for (var i = 0; i < listenerArray.length; ++i) {\n      if ((!hasType || listenerArray[i].type == typeStr) &&\n          (!hasCapture || listenerArray[i].capture == opt_capture)) {\n        return true;\n      }\n    }\n\n    return false;\n  });\n};\n\n\n/**\n * Finds the index of a matching goog.events.Listener in the given\n * listenerArray.\n * @param {!Array<!goog.events.Listener>} listenerArray Array of listener.\n * @param {!Function} listener The listener function.\n * @param {boolean=} opt_useCapture The capture flag for the listener.\n * @param {Object=} opt_listenerScope The listener scope.\n * @return {number} The index of the matching listener within the\n *     listenerArray.\n * @private\n */\ngoog.events.ListenerMap.findListenerIndex_ = function(\n    listenerArray, listener, opt_useCapture, opt_listenerScope) {\n  for (var i = 0; i < listenerArray.length; ++i) {\n    var listenerObj = listenerArray[i];\n    if (!listenerObj.removed && listenerObj.listener == listener &&\n        listenerObj.capture == !!opt_useCapture &&\n        listenerObj.handler == opt_listenerScope) {\n      return i;\n    }\n  }\n  return -1;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview An event manager for both native browser event\n * targets and custom JavaScript event targets\n * (`goog.events.Listenable`). This provides an abstraction\n * over browsers' event systems.\n *\n * It also provides a simulation of W3C event model's capture phase in\n * Internet Explorer (IE 8 and below). Caveat: the simulation does not\n * interact well with listeners registered directly on the elements\n * (bypassing goog.events) or even with listeners registered via\n * goog.events in a separate JS binary. In these cases, we provide\n * no ordering guarantees.\n *\n * The listeners will receive a \"patched\" event object. Such event object\n * contains normalized values for certain event properties that differs in\n * different browsers.\n *\n * Example usage:\n * <pre>\n * goog.events.listen(myNode, 'click', function(e) { alert('woo') });\n * goog.events.listen(myNode, 'mouseover', mouseHandler, true);\n * goog.events.unlisten(myNode, 'mouseover', mouseHandler, true);\n * goog.events.removeAll(myNode);\n * </pre>\n *\n *                                            in IE and event object patching]\n *\n * @see ../demos/events.html\n * @see ../demos/event-propagation.html\n * @see ../demos/stopevent.html\n */\n\n// IMPLEMENTATION NOTES:\n// goog.events stores an auxiliary data structure on each EventTarget\n// source being listened on. This allows us to take advantage of GC,\n// having the data structure GC'd when the EventTarget is GC'd. This\n// GC behavior is equivalent to using W3C DOM Events directly.\n\ngoog.provide('goog.events');\ngoog.provide('goog.events.CaptureSimulationMode');\ngoog.provide('goog.events.Key');\ngoog.provide('goog.events.ListenableType');\n\ngoog.forwardDeclare('goog.debug.ErrorHandler');\ngoog.forwardDeclare('goog.events.EventWrapper');\ngoog.require('goog.asserts');\ngoog.require('goog.debug.entryPointRegistry');\ngoog.require('goog.events.BrowserEvent');\ngoog.require('goog.events.BrowserFeature');\ngoog.require('goog.events.Listenable');\ngoog.require('goog.events.ListenerMap');\n\n\n/**\n * @typedef {number|goog.events.ListenableKey}\n */\ngoog.events.Key;\n\n\n/**\n * @typedef {EventTarget|goog.events.Listenable}\n */\ngoog.events.ListenableType;\n\n\n/**\n * Property name on a native event target for the listener map\n * associated with the event target.\n * @private @const {string}\n */\ngoog.events.LISTENER_MAP_PROP_ = 'closure_lm_' + ((Math.random() * 1e6) | 0);\n\n\n/**\n * String used to prepend to IE event types.\n * @const\n * @private\n */\ngoog.events.onString_ = 'on';\n\n\n/**\n * Map of computed \"on<eventname>\" strings for IE event types. Caching\n * this removes an extra object allocation in goog.events.listen which\n * improves IE6 performance.\n * @const\n * @dict\n * @private\n */\ngoog.events.onStringMap_ = {};\n\n\n/**\n * @enum {number} Different capture simulation mode for IE8-.\n */\ngoog.events.CaptureSimulationMode = {\n  /**\n   * Does not perform capture simulation. Will asserts in IE8- when you\n   * add capture listeners.\n   */\n  OFF_AND_FAIL: 0,\n\n  /**\n   * Does not perform capture simulation, silently ignore capture\n   * listeners.\n   */\n  OFF_AND_SILENT: 1,\n\n  /**\n   * Performs capture simulation.\n   */\n  ON: 2\n};\n\n\n/**\n * @define {number} The capture simulation mode for IE8-. By default,\n *     this is ON.\n */\ngoog.events.CAPTURE_SIMULATION_MODE =\n    goog.define('goog.events.CAPTURE_SIMULATION_MODE', 2);\n\n\n/**\n * Estimated count of total native listeners.\n * @private {number}\n */\ngoog.events.listenerCountEstimate_ = 0;\n\n\n/**\n * Adds an event listener for a specific event on a native event\n * target (such as a DOM element) or an object that has implemented\n * {@link goog.events.Listenable}. A listener can only be added once\n * to an object and if it is added again the key for the listener is\n * returned. Note that if the existing listener is a one-off listener\n * (registered via listenOnce), it will no longer be a one-off\n * listener after a call to listen().\n *\n * @param {EventTarget|goog.events.Listenable} src The node to listen\n *     to events on.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type or array of event types.\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}\n *     listener Callback method, or an object with a handleEvent function.\n *     WARNING: passing an Object is now softly deprecated.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @param {T=} opt_handler Element in whose scope to call the listener.\n * @return {goog.events.Key} Unique key for the listener.\n * @template T,EVENTOBJ\n */\ngoog.events.listen = function(src, type, listener, opt_options, opt_handler) {\n  if (opt_options && opt_options.once) {\n    return goog.events.listenOnce(\n        src, type, listener, opt_options, opt_handler);\n  }\n  if (Array.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.listen(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    var capture =\n        goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n    return src.listen(\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\n        opt_handler);\n  } else {\n    return goog.events.listen_(\n        /** @type {!EventTarget} */ (src), type, listener,\n        /* callOnce */ false, opt_options, opt_handler);\n  }\n};\n\n\n/**\n * Adds an event listener for a specific event on a native event\n * target. A listener can only be added once to an object and if it\n * is added again the key for the listener is returned.\n *\n * Note that a one-off listener will not change an existing listener,\n * if any. On the other hand a normal listener will change existing\n * one-off listener to become a normal listener.\n *\n * @param {EventTarget} src The node to listen to events on.\n * @param {string|?goog.events.EventId<EVENTOBJ>} type Event type.\n * @param {!Function} listener Callback function.\n * @param {boolean} callOnce Whether the listener is a one-off\n *     listener or otherwise.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @param {Object=} opt_handler Element in whose scope to call the listener.\n * @return {goog.events.ListenableKey} Unique key for the listener.\n * @template EVENTOBJ\n * @private\n */\ngoog.events.listen_ = function(\n    src, type, listener, callOnce, opt_options, opt_handler) {\n  if (!type) {\n    throw new Error('Invalid event type');\n  }\n\n  var capture =\n      goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n  if (capture && !goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {\n    if (goog.events.CAPTURE_SIMULATION_MODE ==\n        goog.events.CaptureSimulationMode.OFF_AND_FAIL) {\n      goog.asserts.fail('Can not register capture listener in IE8-.');\n      return null;\n    } else if (\n        goog.events.CAPTURE_SIMULATION_MODE ==\n        goog.events.CaptureSimulationMode.OFF_AND_SILENT) {\n      return null;\n    }\n  }\n\n  var listenerMap = goog.events.getListenerMap_(src);\n  if (!listenerMap) {\n    src[goog.events.LISTENER_MAP_PROP_] = listenerMap =\n        new goog.events.ListenerMap(src);\n  }\n\n  var listenerObj = /** @type {goog.events.Listener} */ (\n      listenerMap.add(type, listener, callOnce, capture, opt_handler));\n\n  // If the listenerObj already has a proxy, it has been set up\n  // previously. We simply return.\n  if (listenerObj.proxy) {\n    return listenerObj;\n  }\n\n  var proxy = goog.events.getProxy();\n  listenerObj.proxy = proxy;\n\n  proxy.src = src;\n  proxy.listener = listenerObj;\n\n  // Attach the proxy through the browser's API\n  if (src.addEventListener) {\n    // Don't pass an object as `capture` if the browser doesn't support that.\n    if (!goog.events.BrowserFeature.PASSIVE_EVENTS) {\n      opt_options = capture;\n    }\n    // Don't break tests that expect a boolean.\n    if (opt_options === undefined) opt_options = false;\n    src.addEventListener(type.toString(), proxy, opt_options);\n  } else if (src.attachEvent) {\n    // The else if above used to be an unconditional else. It would call\n    // attachEvent come gws or high water. This would sometimes throw an\n    // exception on IE11, spoiling the day of some callers. The previous\n    // incarnation of this code, from 2007, indicates that it replaced an\n    // earlier still version that caused excess allocations on IE6.\n    src.attachEvent(goog.events.getOnString_(type.toString()), proxy);\n  } else if (src.addListener && src.removeListener) {\n    // In IE, MediaQueryList uses addListener() insteadd of addEventListener. In\n    // Safari, there is no global for the MediaQueryList constructor, so we just\n    // check whether the object \"looks like\" MediaQueryList.\n    goog.asserts.assert(\n        type === 'change', 'MediaQueryList only has a change event');\n    src.addListener(proxy);\n  } else {\n    throw new Error('addEventListener and attachEvent are unavailable.');\n  }\n\n  goog.events.listenerCountEstimate_++;\n  return listenerObj;\n};\n\n\n/**\n * Helper function for returning a proxy function.\n * @return {!Function} A new or reused function object.\n */\ngoog.events.getProxy = function() {\n  var proxyCallbackFunction = goog.events.handleBrowserEvent_;\n  // Use a local var f to prevent one allocation.\n  var f =\n      goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT ? function(eventObject) {\n        return proxyCallbackFunction.call(f.src, f.listener, eventObject);\n      } : function(eventObject) {\n        var v = proxyCallbackFunction.call(f.src, f.listener, eventObject);\n        // NOTE(chrishenry): In IE, we hack in a capture phase. However, if\n        // there is inline event handler which tries to prevent default (for\n        // example <a href=\"...\" onclick=\"return false\">...</a>) in a\n        // descendant element, the prevent default will be overridden\n        // by this listener if this listener were to return true. Hence, we\n        // return undefined.\n        if (!v) return v;\n      };\n  return f;\n};\n\n\n/**\n * Adds an event listener for a specific event on a native event\n * target (such as a DOM element) or an object that has implemented\n * {@link goog.events.Listenable}. After the event has fired the event\n * listener is removed from the target.\n *\n * If an existing listener already exists, listenOnce will do\n * nothing. In particular, if the listener was previously registered\n * via listen(), listenOnce() will not turn the listener into a\n * one-off listener. Similarly, if there is already an existing\n * one-off listener, listenOnce does not modify the listeners (it is\n * still a once listener).\n *\n * @param {EventTarget|goog.events.Listenable} src The node to listen\n *     to events on.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type or array of event types.\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}\n *     listener Callback method.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @param {T=} opt_handler Element in whose scope to call the listener.\n * @return {goog.events.Key} Unique key for the listener.\n * @template T,EVENTOBJ\n */\ngoog.events.listenOnce = function(\n    src, type, listener, opt_options, opt_handler) {\n  if (Array.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.listenOnce(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    var capture =\n        goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n    return src.listenOnce(\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\n        opt_handler);\n  } else {\n    return goog.events.listen_(\n        /** @type {!EventTarget} */ (src), type, listener,\n        /* callOnce */ true, opt_options, opt_handler);\n  }\n};\n\n\n/**\n * Adds an event listener with a specific event wrapper on a DOM Node or an\n * object that has implemented {@link goog.events.Listenable}. A listener can\n * only be added once to an object.\n *\n * @param {EventTarget|goog.events.Listenable} src The target to\n *     listen to events on.\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\n * @param {function(this:T, ?):?|{handleEvent:function(?):?}|null} listener\n *     Callback method, or an object with a handleEvent function.\n * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to\n *     false).\n * @param {T=} opt_handler Element in whose scope to call the listener.\n * @template T\n */\ngoog.events.listenWithWrapper = function(\n    src, wrapper, listener, opt_capt, opt_handler) {\n  wrapper.listen(src, listener, opt_capt, opt_handler);\n};\n\n\n/**\n * Removes an event listener which was added with listen().\n *\n * @param {EventTarget|goog.events.Listenable} src The target to stop\n *     listening to events on.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type or array of event types to unlisten to.\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener The\n *     listener function to remove.\n * @param {(boolean|!EventListenerOptions)=} opt_options\n *     whether the listener is fired during the capture or bubble phase of the\n *     event.\n * @param {Object=} opt_handler Element in whose scope to call the listener.\n * @return {?boolean} indicating whether the listener was there to remove.\n * @template EVENTOBJ\n */\ngoog.events.unlisten = function(src, type, listener, opt_options, opt_handler) {\n  if (Array.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      goog.events.unlisten(src, type[i], listener, opt_options, opt_handler);\n    }\n    return null;\n  }\n  var capture =\n      goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n\n  listener = goog.events.wrapListener(listener);\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return src.unlisten(\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\n        opt_handler);\n  }\n\n  if (!src) {\n    // TODO(chrishenry): We should tighten the API to only accept\n    // non-null objects, or add an assertion here.\n    return false;\n  }\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (src));\n  if (listenerMap) {\n    var listenerObj = listenerMap.getListener(\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\n        opt_handler);\n    if (listenerObj) {\n      return goog.events.unlistenByKey(listenerObj);\n    }\n  }\n\n  return false;\n};\n\n\n/**\n * Removes an event listener which was added with listen() by the key\n * returned by listen().\n *\n * @param {goog.events.Key} key The key returned by listen() for this\n *     event listener.\n * @return {boolean} indicating whether the listener was there to remove.\n */\ngoog.events.unlistenByKey = function(key) {\n  // TODO(chrishenry): Remove this check when tests that rely on this\n  // are fixed.\n  if (typeof key === 'number') {\n    return false;\n  }\n\n  var listener = key;\n  if (!listener || listener.removed) {\n    return false;\n  }\n\n  var src = listener.src;\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return /** @type {!goog.events.Listenable} */ (src).unlistenByKey(listener);\n  }\n\n  var type = listener.type;\n  var proxy = listener.proxy;\n  if (src.removeEventListener) {\n    src.removeEventListener(type, proxy, listener.capture);\n  } else if (src.detachEvent) {\n    src.detachEvent(goog.events.getOnString_(type), proxy);\n  } else if (src.addListener && src.removeListener) {\n    src.removeListener(proxy);\n  }\n  goog.events.listenerCountEstimate_--;\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (src));\n  // TODO(chrishenry): Try to remove this conditional and execute the\n  // first branch always. This should be safe.\n  if (listenerMap) {\n    listenerMap.removeByKey(listener);\n    if (listenerMap.getTypeCount() == 0) {\n      // Null the src, just because this is simple to do (and useful\n      // for IE <= 7).\n      listenerMap.src = null;\n      // We don't use delete here because IE does not allow delete\n      // on a window object.\n      src[goog.events.LISTENER_MAP_PROP_] = null;\n    }\n  } else {\n    /** @type {!goog.events.Listener} */ (listener).markAsRemoved();\n  }\n\n  return true;\n};\n\n\n/**\n * Removes an event listener which was added with listenWithWrapper().\n *\n * @param {EventTarget|goog.events.Listenable} src The target to stop\n *     listening to events on.\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener The\n *     listener function to remove.\n * @param {boolean=} opt_capt In DOM-compliant browsers, this determines\n *     whether the listener is fired during the capture or bubble phase of the\n *     event.\n * @param {Object=} opt_handler Element in whose scope to call the listener.\n */\ngoog.events.unlistenWithWrapper = function(\n    src, wrapper, listener, opt_capt, opt_handler) {\n  wrapper.unlisten(src, listener, opt_capt, opt_handler);\n};\n\n\n/**\n * Removes all listeners from an object. You can also optionally\n * remove listeners of a particular type.\n *\n * @param {Object|undefined} obj Object to remove listeners from. Must be an\n *     EventTarget or a goog.events.Listenable.\n * @param {string|!goog.events.EventId=} opt_type Type of event to remove.\n *     Default is all types.\n * @return {number} Number of listeners removed.\n */\ngoog.events.removeAll = function(obj, opt_type) {\n  // TODO(chrishenry): Change the type of obj to\n  // (!EventTarget|!goog.events.Listenable).\n\n  if (!obj) {\n    return 0;\n  }\n\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return /** @type {?} */ (obj).removeAllListeners(opt_type);\n  }\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (obj));\n  if (!listenerMap) {\n    return 0;\n  }\n\n  var count = 0;\n  var typeStr = opt_type && opt_type.toString();\n  for (var type in listenerMap.listeners) {\n    if (!typeStr || type == typeStr) {\n      // Clone so that we don't need to worry about unlistenByKey\n      // changing the content of the ListenerMap.\n      var listeners = listenerMap.listeners[type].concat();\n      for (var i = 0; i < listeners.length; ++i) {\n        if (goog.events.unlistenByKey(listeners[i])) {\n          ++count;\n        }\n      }\n    }\n  }\n  return count;\n};\n\n\n/**\n * Gets the listeners for a given object, type and capture phase.\n *\n * @param {Object} obj Object to get listeners for.\n * @param {string|!goog.events.EventId} type Event type.\n * @param {boolean} capture Capture phase?.\n * @return {!Array<!goog.events.Listener>} Array of listener objects.\n */\ngoog.events.getListeners = function(obj, type, capture) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return /** @type {!goog.events.Listenable} */ (obj).getListeners(\n        type, capture);\n  } else {\n    if (!obj) {\n      // TODO(chrishenry): We should tighten the API to accept\n      // !EventTarget|goog.events.Listenable, and add an assertion here.\n      return [];\n    }\n\n    var listenerMap = goog.events.getListenerMap_(\n        /** @type {!EventTarget} */ (obj));\n    return listenerMap ? listenerMap.getListeners(type, capture) : [];\n  }\n};\n\n\n/**\n * Gets the goog.events.Listener for the event or null if no such listener is\n * in use.\n *\n * @param {EventTarget|goog.events.Listenable} src The target from\n *     which to get listeners.\n * @param {?string|!goog.events.EventId<EVENTOBJ>} type The type of the event.\n * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null} listener The\n *     listener function to get.\n * @param {boolean=} opt_capt In DOM-compliant browsers, this determines\n *                            whether the listener is fired during the\n *                            capture or bubble phase of the event.\n * @param {Object=} opt_handler Element in whose scope to call the listener.\n * @return {goog.events.ListenableKey} the found listener or null if not found.\n * @template EVENTOBJ\n */\ngoog.events.getListener = function(src, type, listener, opt_capt, opt_handler) {\n  // TODO(chrishenry): Change type from ?string to string, or add assertion.\n  type = /** @type {string} */ (type);\n  listener = goog.events.wrapListener(listener);\n  var capture = !!opt_capt;\n  if (goog.events.Listenable.isImplementedBy(src)) {\n    return src.getListener(type, listener, capture, opt_handler);\n  }\n\n  if (!src) {\n    // TODO(chrishenry): We should tighten the API to only accept\n    // non-null objects, or add an assertion here.\n    return null;\n  }\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (src));\n  if (listenerMap) {\n    return listenerMap.getListener(type, listener, capture, opt_handler);\n  }\n  return null;\n};\n\n\n/**\n * Returns whether an event target has any active listeners matching the\n * specified signature. If either the type or capture parameters are\n * unspecified, the function will match on the remaining criteria.\n *\n * @param {EventTarget|goog.events.Listenable} obj Target to get\n *     listeners for.\n * @param {string|!goog.events.EventId=} opt_type Event type.\n * @param {boolean=} opt_capture Whether to check for capture or bubble-phase\n *     listeners.\n * @return {boolean} Whether an event target has one or more listeners matching\n *     the requested type and/or capture phase.\n */\ngoog.events.hasListener = function(obj, opt_type, opt_capture) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return obj.hasListener(opt_type, opt_capture);\n  }\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {!EventTarget} */ (obj));\n  return !!listenerMap && listenerMap.hasListener(opt_type, opt_capture);\n};\n\n\n/**\n * Provides a nice string showing the normalized event objects public members\n * @param {Object} e Event Object.\n * @return {string} String of the public members of the normalized event object.\n */\ngoog.events.expose = function(e) {\n  var str = [];\n  for (var key in e) {\n    if (e[key] && e[key].id) {\n      str.push(key + ' = ' + e[key] + ' (' + e[key].id + ')');\n    } else {\n      str.push(key + ' = ' + e[key]);\n    }\n  }\n  return str.join('\\n');\n};\n\n\n/**\n * Returns a string with on prepended to the specified type. This is used for IE\n * which expects \"on\" to be prepended. This function caches the string in order\n * to avoid extra allocations in steady state.\n * @param {string} type Event type.\n * @return {string} The type string with 'on' prepended.\n * @private\n */\ngoog.events.getOnString_ = function(type) {\n  if (type in goog.events.onStringMap_) {\n    return goog.events.onStringMap_[type];\n  }\n  return goog.events.onStringMap_[type] = goog.events.onString_ + type;\n};\n\n\n/**\n * Fires an object's listeners of a particular type and phase\n *\n * @param {Object} obj Object whose listeners to call.\n * @param {string|!goog.events.EventId} type Event type.\n * @param {boolean} capture Which event phase.\n * @param {Object} eventObject Event object to be passed to listener.\n * @return {boolean} True if all listeners returned true else false.\n */\ngoog.events.fireListeners = function(obj, type, capture, eventObject) {\n  if (goog.events.Listenable.isImplementedBy(obj)) {\n    return /** @type {!goog.events.Listenable} */ (obj).fireListeners(\n        type, capture, eventObject);\n  }\n\n  return goog.events.fireListeners_(obj, type, capture, eventObject);\n};\n\n\n/**\n * Fires an object's listeners of a particular type and phase.\n * @param {Object} obj Object whose listeners to call.\n * @param {string|!goog.events.EventId} type Event type.\n * @param {boolean} capture Which event phase.\n * @param {Object} eventObject Event object to be passed to listener.\n * @return {boolean} True if all listeners returned true else false.\n * @private\n */\ngoog.events.fireListeners_ = function(obj, type, capture, eventObject) {\n  /** @type {boolean} */\n  var retval = true;\n\n  var listenerMap = goog.events.getListenerMap_(\n      /** @type {EventTarget} */ (obj));\n  if (listenerMap) {\n    // TODO(chrishenry): Original code avoids array creation when there\n    // is no listener, so we do the same. If this optimization turns\n    // out to be not required, we can replace this with\n    // listenerMap.getListeners(type, capture) instead, which is simpler.\n    var listenerArray = listenerMap.listeners[type.toString()];\n    if (listenerArray) {\n      listenerArray = listenerArray.concat();\n      for (var i = 0; i < listenerArray.length; i++) {\n        var listener = listenerArray[i];\n        // We might not have a listener if the listener was removed.\n        if (listener && listener.capture == capture && !listener.removed) {\n          var result = goog.events.fireListener(listener, eventObject);\n          retval = retval && (result !== false);\n        }\n      }\n    }\n  }\n  return retval;\n};\n\n\n/**\n * Fires a listener with a set of arguments\n *\n * @param {goog.events.Listener} listener The listener object to call.\n * @param {Object} eventObject The event object to pass to the listener.\n * @return {*} Result of listener.\n */\ngoog.events.fireListener = function(listener, eventObject) {\n  var listenerFn = listener.listener;\n  var listenerHandler = listener.handler || listener.src;\n\n  if (listener.callOnce) {\n    goog.events.unlistenByKey(listener);\n  }\n  return listenerFn.call(listenerHandler, eventObject);\n};\n\n\n/**\n * Gets the total number of listeners currently in the system.\n * @return {number} Number of listeners.\n * @deprecated This returns estimated count, now that Closure no longer\n * stores a central listener registry. We still return an estimation\n * to keep existing listener-related tests passing. In the near future,\n * this function will be removed.\n */\ngoog.events.getTotalListenerCount = function() {\n  return goog.events.listenerCountEstimate_;\n};\n\n\n/**\n * Dispatches an event (or event like object) and calls all listeners\n * listening for events of this type. The type of the event is decided by the\n * type property on the event object.\n *\n * If any of the listeners returns false OR calls preventDefault then this\n * function will return false.  If one of the capture listeners calls\n * stopPropagation, then the bubble listeners won't fire.\n *\n * @param {goog.events.Listenable} src The event target.\n * @param {goog.events.EventLike} e Event object.\n * @return {boolean} If anyone called preventDefault on the event object (or\n *     if any of the handlers returns false) this will also return false.\n *     If there are no handlers, or if all handlers return true, this returns\n *     true.\n */\ngoog.events.dispatchEvent = function(src, e) {\n  goog.asserts.assert(\n      goog.events.Listenable.isImplementedBy(src),\n      'Can not use goog.events.dispatchEvent with ' +\n          'non-goog.events.Listenable instance.');\n  return src.dispatchEvent(e);\n};\n\n\n/**\n * Installs exception protection for the browser event entry point using the\n * given error handler.\n *\n * @param {goog.debug.ErrorHandler} errorHandler Error handler with which to\n *     protect the entry point.\n */\ngoog.events.protectBrowserEventEntryPoint = function(errorHandler) {\n  goog.events.handleBrowserEvent_ =\n      errorHandler.protectEntryPoint(goog.events.handleBrowserEvent_);\n};\n\n\n/**\n * Handles an event and dispatches it to the correct listeners. This\n * function is a proxy for the real listener the user specified.\n *\n * @param {goog.events.Listener} listener The listener object.\n * @param {Event=} opt_evt Optional event object that gets passed in via the\n *     native event handlers.\n * @return {*} Result of the event handler.\n * @this {EventTarget} The object or Element that fired the event.\n * @private\n */\ngoog.events.handleBrowserEvent_ = function(listener, opt_evt) {\n  if (listener.removed) {\n    return true;\n  }\n\n  // Synthesize event propagation if the browser does not support W3C\n  // event model.\n  if (!goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {\n    var ieEvent = opt_evt ||\n        /** @type {Event} */ (goog.getObjectByName('window.event'));\n    var evt = new goog.events.BrowserEvent(ieEvent, this);\n    /** @type {*} */\n    var retval = true;\n\n    if (goog.events.CAPTURE_SIMULATION_MODE ==\n        goog.events.CaptureSimulationMode.ON) {\n      // If we have not marked this event yet, we should perform capture\n      // simulation.\n      if (!goog.events.isMarkedIeEvent_(ieEvent)) {\n        goog.events.markIeEvent_(ieEvent);\n\n        var ancestors = [];\n        for (var parent = evt.currentTarget; parent;\n             parent = parent.parentNode) {\n          ancestors.push(parent);\n        }\n\n        // Fire capture listeners.\n        var type = listener.type;\n        for (var i = ancestors.length - 1;\n             !evt.hasPropagationStopped() && i >= 0; i--) {\n          evt.currentTarget = ancestors[i];\n          var result =\n              goog.events.fireListeners_(ancestors[i], type, true, evt);\n          retval = retval && result;\n        }\n\n        // Fire bubble listeners.\n        //\n        // We can technically rely on IE to perform bubble event\n        // propagation. However, it turns out that IE fires events in\n        // opposite order of attachEvent registration, which broke\n        // some code and tests that rely on the order. (While W3C DOM\n        // Level 2 Events TR leaves the event ordering unspecified,\n        // modern browsers and W3C DOM Level 3 Events Working Draft\n        // actually specify the order as the registration order.)\n        for (var i = 0; !evt.hasPropagationStopped() && i < ancestors.length;\n             i++) {\n          evt.currentTarget = ancestors[i];\n          var result =\n              goog.events.fireListeners_(ancestors[i], type, false, evt);\n          retval = retval && result;\n        }\n      }\n    } else {\n      retval = goog.events.fireListener(listener, evt);\n    }\n    return retval;\n  }\n\n  // Otherwise, simply fire the listener.\n  return goog.events.fireListener(\n      listener, new goog.events.BrowserEvent(opt_evt, this));\n};\n\n\n/**\n * This is used to mark the IE event object so we do not do the Closure pass\n * twice for a bubbling event.\n * @param {Event} e The IE browser event.\n * @private\n */\ngoog.events.markIeEvent_ = function(e) {\n  // Only the keyCode and the returnValue can be changed. We use keyCode for\n  // non keyboard events.\n  // event.returnValue is a bit more tricky. It is undefined by default. A\n  // boolean false prevents the default action. In a window.onbeforeunload and\n  // the returnValue is non undefined it will be alerted. However, we will only\n  // modify the returnValue for keyboard events. We can get a problem if non\n  // closure events sets the keyCode or the returnValue\n\n  var useReturnValue = false;\n\n  if (e.keyCode == 0) {\n    // We cannot change the keyCode in case that srcElement is input[type=file].\n    // We could test that that is the case but that would allocate 3 objects.\n    // If we use try/catch we will only allocate extra objects in the case of a\n    // failure.\n\n    try {\n      e.keyCode = -1;\n      return;\n    } catch (ex) {\n      useReturnValue = true;\n    }\n  }\n\n  if (useReturnValue ||\n      /** @type {boolean|undefined} */ (e.returnValue) == undefined) {\n    e.returnValue = true;\n  }\n};\n\n\n/**\n * This is used to check if an IE event has already been handled by the Closure\n * system so we do not do the Closure pass twice for a bubbling event.\n * @param {Event} e  The IE browser event.\n * @return {boolean} True if the event object has been marked.\n * @private\n */\ngoog.events.isMarkedIeEvent_ = function(e) {\n  return e.keyCode < 0 || e.returnValue != undefined;\n};\n\n\n/**\n * Counter to create unique event ids.\n * @private {number}\n */\ngoog.events.uniqueIdCounter_ = 0;\n\n\n/**\n * Creates a unique event id.\n *\n * @param {string} identifier The identifier.\n * @return {string} A unique identifier.\n * @idGenerator {unique}\n */\ngoog.events.getUniqueId = function(identifier) {\n  return identifier + '_' + goog.events.uniqueIdCounter_++;\n};\n\n\n/**\n * @param {EventTarget} src The source object.\n * @return {goog.events.ListenerMap} A listener map for the given\n *     source object, or null if none exists.\n * @private\n */\ngoog.events.getListenerMap_ = function(src) {\n  var listenerMap = src[goog.events.LISTENER_MAP_PROP_];\n  // IE serializes the property as well (e.g. when serializing outer\n  // HTML). So we must check that the value is of the correct type.\n  return listenerMap instanceof goog.events.ListenerMap ? listenerMap : null;\n};\n\n\n/**\n * Expando property for listener function wrapper for Object with\n * handleEvent.\n * @private @const {string}\n */\ngoog.events.LISTENER_WRAPPER_PROP_ =\n    '__closure_events_fn_' + ((Math.random() * 1e9) >>> 0);\n\n\n/**\n * @param {Object|Function} listener The listener function or an\n *     object that contains handleEvent method.\n * @return {!Function} Either the original function or a function that\n *     calls obj.handleEvent. If the same listener is passed to this\n *     function more than once, the same function is guaranteed to be\n *     returned.\n */\ngoog.events.wrapListener = function(listener) {\n  goog.asserts.assert(listener, 'Listener can not be null.');\n\n  if (goog.isFunction(listener)) {\n    return listener;\n  }\n\n  goog.asserts.assert(\n      listener.handleEvent, 'An object listener must have handleEvent method.');\n  if (!listener[goog.events.LISTENER_WRAPPER_PROP_]) {\n    listener[goog.events.LISTENER_WRAPPER_PROP_] = function(e) {\n      return /** @type {?} */ (listener).handleEvent(e);\n    };\n  }\n  return listener[goog.events.LISTENER_WRAPPER_PROP_];\n};\n\n\n// Register the browser event handler as an entry point, so that\n// it can be monitored for exception handling, etc.\ngoog.debug.entryPointRegistry.register(\n    /**\n     * @param {function(!Function): !Function} transformer The transforming\n     *     function.\n     */\n    function(transformer) {\n      goog.events.handleBrowserEvent_ =\n          transformer(goog.events.handleBrowserEvent_);\n    });\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview A disposable implementation of a custom\n * listenable/event target. See also: documentation for\n * `goog.events.Listenable`.\n *\n * @see ../demos/eventtarget.html\n * @see goog.events.Listenable\n */\n\ngoog.provide('goog.events.EventTarget');\n\ngoog.require('goog.Disposable');\ngoog.require('goog.asserts');\ngoog.require('goog.events');\ngoog.require('goog.events.Event');\ngoog.require('goog.events.Listenable');\ngoog.require('goog.events.ListenerMap');\ngoog.require('goog.object');\n\n\n\n/**\n * An implementation of `goog.events.Listenable` with full W3C\n * EventTarget-like support (capture/bubble mechanism, stopping event\n * propagation, preventing default actions).\n *\n * You may subclass this class to turn your class into a Listenable.\n *\n * Unless propagation is stopped, an event dispatched by an\n * EventTarget will bubble to the parent returned by\n * `getParentEventTarget`. To set the parent, call\n * `setParentEventTarget`. Subclasses that don't support\n * changing the parent can override the setter to throw an error.\n *\n * Example usage:\n * <pre>\n *   var source = new goog.events.EventTarget();\n *   function handleEvent(e) {\n *     alert('Type: ' + e.type + '; Target: ' + e.target);\n *   }\n *   source.listen('foo', handleEvent);\n *   // Or: goog.events.listen(source, 'foo', handleEvent);\n *   ...\n *   source.dispatchEvent('foo');  // will call handleEvent\n *   ...\n *   source.unlisten('foo', handleEvent);\n *   // Or: goog.events.unlisten(source, 'foo', handleEvent);\n * </pre>\n *\n * @constructor\n * @extends {goog.Disposable}\n * @implements {goog.events.Listenable}\n */\ngoog.events.EventTarget = function() {\n  goog.Disposable.call(this);\n\n  /**\n   * Maps of event type to an array of listeners.\n   * @private {!goog.events.ListenerMap}\n   */\n  this.eventTargetListeners_ = new goog.events.ListenerMap(this);\n\n  /**\n   * The object to use for event.target. Useful when mixing in an\n   * EventTarget to another object.\n   * @private {!Object}\n   */\n  this.actualEventTarget_ = this;\n\n  /**\n   * Parent event target, used during event bubbling.\n   *\n   * TODO(chrishenry): Change this to goog.events.Listenable. This\n   * currently breaks people who expect getParentEventTarget to return\n   * goog.events.EventTarget.\n   *\n   * @private {?goog.events.EventTarget}\n   */\n  this.parentEventTarget_ = null;\n};\ngoog.inherits(goog.events.EventTarget, goog.Disposable);\ngoog.events.Listenable.addImplementation(goog.events.EventTarget);\n\n\n/**\n * An artificial cap on the number of ancestors you can have. This is mainly\n * for loop detection.\n * @const {number}\n * @private\n */\ngoog.events.EventTarget.MAX_ANCESTORS_ = 1000;\n\n\n/**\n * Returns the parent of this event target to use for bubbling.\n *\n * @return {goog.events.EventTarget} The parent EventTarget or null if\n *     there is no parent.\n * @override\n */\ngoog.events.EventTarget.prototype.getParentEventTarget = function() {\n  return this.parentEventTarget_;\n};\n\n\n/**\n * Sets the parent of this event target to use for capture/bubble\n * mechanism.\n * @param {goog.events.EventTarget} parent Parent listenable (null if none).\n */\ngoog.events.EventTarget.prototype.setParentEventTarget = function(parent) {\n  this.parentEventTarget_ = parent;\n};\n\n\n/**\n * Adds an event listener to the event target. The same handler can only be\n * added once per the type. Even if you add the same handler multiple times\n * using the same type then it will only be called once when the event is\n * dispatched.\n *\n * @param {string|!goog.events.EventId} type The type of the event to listen for\n * @param {function(?):?|{handleEvent:function(?):?}|null} handler The function\n *     to handle the event. The handler can also be an object that implements\n *     the handleEvent method which takes the event object as argument.\n * @param {boolean=} opt_capture In DOM-compliant browsers, this determines\n *     whether the listener is fired during the capture or bubble phase\n *     of the event.\n * @param {Object=} opt_handlerScope Object in whose scope to call\n *     the listener.\n * @deprecated Use `#listen` instead, when possible. Otherwise, use\n *     `goog.events.listen` if you are passing Object\n *     (instead of Function) as handler.\n */\ngoog.events.EventTarget.prototype.addEventListener = function(\n    type, handler, opt_capture, opt_handlerScope) {\n  goog.events.listen(this, type, handler, opt_capture, opt_handlerScope);\n};\n\n\n/**\n * Removes an event listener from the event target. The handler must be the\n * same object as the one added. If the handler has not been added then\n * nothing is done.\n *\n * @param {string} type The type of the event to listen for.\n * @param {function(?):?|{handleEvent:function(?):?}|null} handler The function\n *     to handle the event. The handler can also be an object that implements\n *     the handleEvent method which takes the event object as argument.\n * @param {boolean=} opt_capture In DOM-compliant browsers, this determines\n *     whether the listener is fired during the capture or bubble phase\n *     of the event.\n * @param {Object=} opt_handlerScope Object in whose scope to call\n *     the listener.\n * @deprecated Use `#unlisten` instead, when possible. Otherwise, use\n *     `goog.events.unlisten` if you are passing Object\n *     (instead of Function) as handler.\n */\ngoog.events.EventTarget.prototype.removeEventListener = function(\n    type, handler, opt_capture, opt_handlerScope) {\n  goog.events.unlisten(this, type, handler, opt_capture, opt_handlerScope);\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.dispatchEvent = function(e) {\n  this.assertInitialized_();\n\n  var ancestorsTree, ancestor = this.getParentEventTarget();\n  if (ancestor) {\n    ancestorsTree = [];\n    var ancestorCount = 1;\n    for (; ancestor; ancestor = ancestor.getParentEventTarget()) {\n      ancestorsTree.push(ancestor);\n      goog.asserts.assert(\n          (++ancestorCount < goog.events.EventTarget.MAX_ANCESTORS_),\n          'infinite loop');\n    }\n  }\n\n  return goog.events.EventTarget.dispatchEventInternal_(\n      this.actualEventTarget_, e, ancestorsTree);\n};\n\n\n/**\n * Removes listeners from this object.  Classes that extend EventTarget may\n * need to override this method in order to remove references to DOM Elements\n * and additional listeners.\n * @override\n * @protected\n */\ngoog.events.EventTarget.prototype.disposeInternal = function() {\n  goog.events.EventTarget.superClass_.disposeInternal.call(this);\n\n  this.removeAllListeners();\n  this.parentEventTarget_ = null;\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.listen = function(\n    type, listener, opt_useCapture, opt_listenerScope) {\n  this.assertInitialized_();\n  return this.eventTargetListeners_.add(\n      String(type), listener, false /* callOnce */, opt_useCapture,\n      opt_listenerScope);\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.listenOnce = function(\n    type, listener, opt_useCapture, opt_listenerScope) {\n  return this.eventTargetListeners_.add(\n      String(type), listener, true /* callOnce */, opt_useCapture,\n      opt_listenerScope);\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.unlisten = function(\n    type, listener, opt_useCapture, opt_listenerScope) {\n  return this.eventTargetListeners_.remove(\n      String(type), listener, opt_useCapture, opt_listenerScope);\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.unlistenByKey = function(key) {\n  return this.eventTargetListeners_.removeByKey(key);\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.removeAllListeners = function(opt_type) {\n  // TODO(chrishenry): Previously, removeAllListeners can be called on\n  // uninitialized EventTarget, so we preserve that behavior. We\n  // should remove this when usages that rely on that fact are purged.\n  if (!this.eventTargetListeners_) {\n    return 0;\n  }\n  return this.eventTargetListeners_.removeAll(opt_type);\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.fireListeners = function(\n    type, capture, eventObject) {\n  // TODO(chrishenry): Original code avoids array creation when there\n  // is no listener, so we do the same. If this optimization turns\n  // out to be not required, we can replace this with\n  // getListeners(type, capture) instead, which is simpler.\n  var listenerArray = this.eventTargetListeners_.listeners[String(type)];\n  if (!listenerArray) {\n    return true;\n  }\n  listenerArray = listenerArray.concat();\n\n  var rv = true;\n  for (var i = 0; i < listenerArray.length; ++i) {\n    var listener = listenerArray[i];\n    // We might not have a listener if the listener was removed.\n    if (listener && !listener.removed && listener.capture == capture) {\n      var listenerFn = listener.listener;\n      var listenerHandler = listener.handler || listener.src;\n\n      if (listener.callOnce) {\n        this.unlistenByKey(listener);\n      }\n      rv = listenerFn.call(listenerHandler, eventObject) !== false && rv;\n    }\n  }\n\n  return rv && !eventObject.defaultPrevented;\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.getListeners = function(type, capture) {\n  return this.eventTargetListeners_.getListeners(String(type), capture);\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.getListener = function(\n    type, listener, capture, opt_listenerScope) {\n  return this.eventTargetListeners_.getListener(\n      String(type), listener, capture, opt_listenerScope);\n};\n\n\n/** @override */\ngoog.events.EventTarget.prototype.hasListener = function(\n    opt_type, opt_capture) {\n  var id = (opt_type !== undefined) ? String(opt_type) : undefined;\n  return this.eventTargetListeners_.hasListener(id, opt_capture);\n};\n\n\n/**\n * Sets the target to be used for `event.target` when firing\n * event. Mainly used for testing. For example, see\n * `goog.testing.events.mixinListenable`.\n * @param {!Object} target The target.\n */\ngoog.events.EventTarget.prototype.setTargetForTesting = function(target) {\n  this.actualEventTarget_ = target;\n};\n\n\n/**\n * Asserts that the event target instance is initialized properly.\n * @private\n */\ngoog.events.EventTarget.prototype.assertInitialized_ = function() {\n  goog.asserts.assert(\n      this.eventTargetListeners_,\n      'Event target is not initialized. Did you call the superclass ' +\n          '(goog.events.EventTarget) constructor?');\n};\n\n\n/**\n * Dispatches the given event on the ancestorsTree.\n *\n * @param {!Object} target The target to dispatch on.\n * @param {goog.events.Event|Object|string} e The event object.\n * @param {Array<goog.events.Listenable>=} opt_ancestorsTree The ancestors\n *     tree of the target, in reverse order from the closest ancestor\n *     to the root event target. May be null if the target has no ancestor.\n * @return {boolean} If anyone called preventDefault on the event object (or\n *     if any of the listeners returns false) this will also return false.\n * @private\n */\ngoog.events.EventTarget.dispatchEventInternal_ = function(\n    target, e, opt_ancestorsTree) {\n  /** @suppress {missingProperties} */\n  var type = e.type || /** @type {string} */ (e);\n\n  // If accepting a string or object, create a custom event object so that\n  // preventDefault and stopPropagation work with the event.\n  if (typeof e === 'string') {\n    e = new goog.events.Event(e, target);\n  } else if (!(e instanceof goog.events.Event)) {\n    var oldEvent = e;\n    e = new goog.events.Event(type, target);\n    goog.object.extend(e, oldEvent);\n  } else {\n    e.target = e.target || target;\n  }\n\n  var rv = true, currentTarget;\n\n  // Executes all capture listeners on the ancestors, if any.\n  if (opt_ancestorsTree) {\n    for (var i = opt_ancestorsTree.length - 1;\n         !e.hasPropagationStopped() && i >= 0; i--) {\n      currentTarget = e.currentTarget = opt_ancestorsTree[i];\n      rv = currentTarget.fireListeners(type, true, e) && rv;\n    }\n  }\n\n  // Executes capture and bubble listeners on the target.\n  if (!e.hasPropagationStopped()) {\n    currentTarget = /** @type {?} */ (e.currentTarget = target);\n    rv = currentTarget.fireListeners(type, true, e) && rv;\n    if (!e.hasPropagationStopped()) {\n      rv = currentTarget.fireListeners(type, false, e) && rv;\n    }\n  }\n\n  // Executes all bubble listeners on the ancestors, if any.\n  if (opt_ancestorsTree) {\n    for (i = 0; !e.hasPropagationStopped() && i < opt_ancestorsTree.length;\n         i++) {\n      currentTarget = e.currentTarget = opt_ancestorsTree[i];\n      rv = currentTarget.fireListeners(type, false, e) && rv;\n    }\n  }\n\n  return rv;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview JSON utility functions.\n */\n\n\ngoog.provide('goog.json');\ngoog.provide('goog.json.Replacer');\ngoog.provide('goog.json.Reviver');\ngoog.provide('goog.json.Serializer');\n\n\n/**\n * @define {boolean} If true, use the native JSON parsing API.\n * NOTE: The default `goog.json.parse` implementation is able to handle\n * invalid JSON. JSPB used to produce invalid JSON which is not the case\n * anymore so this is safe to enable for parsing JSPB. Using native JSON is\n * faster and safer than the default implementation using `eval`.\n */\ngoog.json.USE_NATIVE_JSON = goog.define('goog.json.USE_NATIVE_JSON', false);\n\n/**\n * @define {boolean} If true, try the native JSON parsing API first. If it\n * fails, log an error and use `eval` instead. This is useful when\n * transitioning to `goog.json.USE_NATIVE_JSON`. The error logger needs to\n * be set by `goog.json.setErrorLogger`. If it is not set then the error\n * is ignored.\n */\ngoog.json.TRY_NATIVE_JSON = goog.define('goog.json.TRY_NATIVE_JSON', false);\n\n\n/**\n * Tests if a string is an invalid JSON string. This only ensures that we are\n * not using any invalid characters\n * @param {string} s The string to test.\n * @return {boolean} True if the input is a valid JSON string.\n */\ngoog.json.isValid = function(s) {\n  // All empty whitespace is not valid.\n  if (/^\\s*$/.test(s)) {\n    return false;\n  }\n\n  // This is taken from http://www.json.org/json2.js which is released to the\n  // public domain.\n  // Changes: We dissallow \\u2028 Line separator and \\u2029 Paragraph separator\n  // inside strings.  We also treat \\u2028 and \\u2029 as whitespace which they\n  // are in the RFC but IE and Safari does not match \\s to these so we need to\n  // include them in the reg exps in all places where whitespace is allowed.\n  // We allowed \\x7f inside strings because some tools don't escape it,\n  // e.g. http://www.json.org/java/org/json/JSONObject.java\n\n  // Parsing happens in three stages. In the first stage, we run the text\n  // against regular expressions that look for non-JSON patterns. We are\n  // especially concerned with '()' and 'new' because they can cause invocation,\n  // and '=' because it can cause mutation. But just to be safe, we want to\n  // reject all unexpected forms.\n\n  // We split the first stage into 4 regexp operations in order to work around\n  // crippling inefficiencies in IE's and Safari's regexp engines. First we\n  // replace all backslash pairs with '@' (a non-JSON character). Second, we\n  // replace all simple value tokens with ']' characters, but only when followed\n  // by a colon, comma, closing bracket or end of string. Third, we delete all\n  // open brackets that follow a colon or comma or that begin the text. Finally,\n  // we look to see that the remaining characters are only whitespace or ']' or\n  // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.\n\n  // Don't make these static since they have the global flag.\n  const backslashesRe = /\\\\[\"\\\\\\/bfnrtu]/g;\n  const simpleValuesRe =\n      /(?:\"[^\"\\\\\\n\\r\\u2028\\u2029\\x00-\\x08\\x0a-\\x1f]*\"|true|false|null|-?\\d+(?:\\.\\d*)?(?:[eE][+\\-]?\\d+)?)[\\s\\u2028\\u2029]*(?=:|,|]|}|$)/g;\n  const openBracketsRe = /(?:^|:|,)(?:[\\s\\u2028\\u2029]*\\[)+/g;\n  const remainderRe = /^[\\],:{}\\s\\u2028\\u2029]*$/;\n\n  return remainderRe.test(\n      s.replace(backslashesRe, '@')\n          .replace(simpleValuesRe, ']')\n          .replace(openBracketsRe, ''));\n};\n\n/**\n * Logs a parsing error in `JSON.parse` solvable by using `eval`\n * if `goog.json.TRY_NATIVE_JSON` is enabled.\n * @private {function(string, !Error)} The first parameter is the error message,\n *     the second is the exception thrown by `JSON.parse`.\n */\ngoog.json.errorLogger_ = goog.nullFunction;\n\n\n/**\n * Sets an error logger to use if there's a recoverable parsing error and\n * `goog.json.TRY_NATIVE_JSON` is enabled.\n * @param {function(string, !Error)} errorLogger The first parameter is the\n *     error message, the second is the exception thrown by `JSON.parse`.\n */\ngoog.json.setErrorLogger = function(errorLogger) {\n  goog.json.errorLogger_ = errorLogger;\n};\n\n\n/**\n * Parses a JSON string and returns the result. This throws an exception if\n * the string is an invalid JSON string.\n *\n * Note that this is very slow on large strings. Use JSON.parse if possible.\n *\n * @param {*} s The JSON string to parse.\n * @throws Error if s is invalid JSON.\n * @return {Object} The object generated from the JSON string, or null.\n * @deprecated Use JSON.parse.\n */\ngoog.json.parse = goog.json.USE_NATIVE_JSON ?\n    /** @type {function(*):Object} */ (goog.global['JSON']['parse']) :\n    function(s) {\n      let error;\n      if (goog.json.TRY_NATIVE_JSON) {\n        try {\n          return goog.global['JSON']['parse'](s);\n        } catch (ex) {\n          error = ex;\n        }\n      }\n      const o = String(s);\n      if (goog.json.isValid(o)) {\n\n        try {\n          const result = /** @type {?Object} */ (eval('(' + o + ')'));\n          if (error) {\n            goog.json.errorLogger_('Invalid JSON: ' + o, error);\n          }\n          return result;\n        } catch (ex) {\n        }\n      }\n      throw new Error('Invalid JSON string: ' + o);\n    };\n\n\n/**\n * JSON replacer, as defined in Section 15.12.3 of the ES5 spec.\n * @see http://ecma-international.org/ecma-262/5.1/#sec-15.12.3\n *\n * TODO(nicksantos): Array should also be a valid replacer.\n *\n * @typedef {function(this:Object, string, *): *}\n */\ngoog.json.Replacer;\n\n\n/**\n * JSON reviver, as defined in Section 15.12.2 of the ES5 spec.\n * @see http://ecma-international.org/ecma-262/5.1/#sec-15.12.3\n *\n * @typedef {function(this:Object, string, *): *}\n */\ngoog.json.Reviver;\n\n\n/**\n * Serializes an object or a value to a JSON string.\n *\n * @param {*} object The object to serialize.\n * @param {?goog.json.Replacer=} opt_replacer A replacer function\n *     called for each (key, value) pair that determines how the value\n *     should be serialized. By defult, this just returns the value\n *     and allows default serialization to kick in.\n * @throws Error if there are loops in the object graph.\n * @return {string} A JSON string representation of the input.\n */\ngoog.json.serialize = goog.json.USE_NATIVE_JSON ?\n    /** @type {function(*, ?goog.json.Replacer=):string} */\n    (goog.global['JSON']['stringify']) :\n    function(object, opt_replacer) {\n      // NOTE(nicksantos): Currently, we never use JSON.stringify.\n      //\n      // The last time I evaluated this, JSON.stringify had subtle bugs and\n      // behavior differences on all browsers, and the performance win was not\n      // large enough to justify all the issues. This may change in the future\n      // as browser implementations get better.\n      //\n      // assertSerialize in json_test contains if branches for the cases\n      // that fail.\n      return new goog.json.Serializer(opt_replacer).serialize(object);\n    };\n\n\n\n/**\n * Class that is used to serialize JSON objects to a string.\n * @param {?goog.json.Replacer=} opt_replacer Replacer.\n * @constructor\n */\ngoog.json.Serializer = function(opt_replacer) {\n  /**\n   * @type {goog.json.Replacer|null|undefined}\n   * @private\n   */\n  this.replacer_ = opt_replacer;\n};\n\n\n/**\n * Serializes an object or a value to a JSON string.\n *\n * @param {*} object The object to serialize.\n * @throws Error if there are loops in the object graph.\n * @return {string} A JSON string representation of the input.\n */\ngoog.json.Serializer.prototype.serialize = function(object) {\n  const sb = [];\n  this.serializeInternal(object, sb);\n  return sb.join('');\n};\n\n\n/**\n * Serializes a generic value to a JSON string\n * @protected\n * @param {*} object The object to serialize.\n * @param {Array<string>} sb Array used as a string builder.\n * @throws Error if there are loops in the object graph.\n */\ngoog.json.Serializer.prototype.serializeInternal = function(object, sb) {\n  if (object == null) {\n    // undefined == null so this branch covers undefined as well as null\n    sb.push('null');\n    return;\n  }\n\n  if (typeof object == 'object') {\n    if (Array.isArray(object)) {\n      this.serializeArray(object, sb);\n      return;\n    } else if (\n        object instanceof String || object instanceof Number ||\n        object instanceof Boolean) {\n      object = object.valueOf();\n      // Fall through to switch below.\n    } else {\n      this.serializeObject_(/** @type {!Object} */ (object), sb);\n      return;\n    }\n  }\n\n  switch (typeof object) {\n    case 'string':\n      this.serializeString_(object, sb);\n      break;\n    case 'number':\n      this.serializeNumber_(object, sb);\n      break;\n    case 'boolean':\n      sb.push(String(object));\n      break;\n    case 'function':\n      sb.push('null');\n      break;\n    default:\n      throw new Error('Unknown type: ' + typeof object);\n  }\n};\n\n\n/**\n * Character mappings used internally for goog.string.quote\n * @private\n * @type {!Object}\n */\ngoog.json.Serializer.charToJsonCharCache_ = {\n  '\\\"': '\\\\\"',\n  '\\\\': '\\\\\\\\',\n  '/': '\\\\/',\n  '\\b': '\\\\b',\n  '\\f': '\\\\f',\n  '\\n': '\\\\n',\n  '\\r': '\\\\r',\n  '\\t': '\\\\t',\n\n  '\\x0B': '\\\\u000b'  // '\\v' is not supported in JScript\n};\n\n\n/**\n * Regular expression used to match characters that need to be replaced.\n * The S60 browser has a bug where unicode characters are not matched by\n * regular expressions. The condition below detects such behaviour and\n * adjusts the regular expression accordingly.\n * @private\n * @type {!RegExp}\n */\ngoog.json.Serializer.charsToReplace_ = /\\uffff/.test('\\uffff') ?\n    /[\\\\\\\"\\x00-\\x1f\\x7f-\\uffff]/g :\n    /[\\\\\\\"\\x00-\\x1f\\x7f-\\xff]/g;\n\n\n/**\n * Serializes a string to a JSON string\n * @private\n * @param {string} s The string to serialize.\n * @param {Array<string>} sb Array used as a string builder.\n */\ngoog.json.Serializer.prototype.serializeString_ = function(s, sb) {\n  // The official JSON implementation does not work with international\n  // characters.\n  sb.push('\"', s.replace(goog.json.Serializer.charsToReplace_, function(c) {\n    // caching the result improves performance by a factor 2-3\n    let rv = goog.json.Serializer.charToJsonCharCache_[c];\n    if (!rv) {\n      rv = '\\\\u' + (c.charCodeAt(0) | 0x10000).toString(16).substr(1);\n      goog.json.Serializer.charToJsonCharCache_[c] = rv;\n    }\n    return rv;\n  }), '\"');\n};\n\n\n/**\n * Serializes a number to a JSON string\n * @private\n * @param {number} n The number to serialize.\n * @param {Array<string>} sb Array used as a string builder.\n */\ngoog.json.Serializer.prototype.serializeNumber_ = function(n, sb) {\n  sb.push(isFinite(n) && !isNaN(n) ? String(n) : 'null');\n};\n\n\n/**\n * Serializes an array to a JSON string\n * @param {Array<string>} arr The array to serialize.\n * @param {Array<string>} sb Array used as a string builder.\n * @protected\n */\ngoog.json.Serializer.prototype.serializeArray = function(arr, sb) {\n  const l = arr.length;\n  sb.push('[');\n  let sep = '';\n  for (let i = 0; i < l; i++) {\n    sb.push(sep);\n\n    const value = arr[i];\n    this.serializeInternal(\n        this.replacer_ ? this.replacer_.call(arr, String(i), value) : value,\n        sb);\n\n    sep = ',';\n  }\n  sb.push(']');\n};\n\n\n/**\n * Serializes an object to a JSON string\n * @private\n * @param {!Object} obj The object to serialize.\n * @param {Array<string>} sb Array used as a string builder.\n */\ngoog.json.Serializer.prototype.serializeObject_ = function(obj, sb) {\n  sb.push('{');\n  let sep = '';\n  for (const key in obj) {\n    if (Object.prototype.hasOwnProperty.call(obj, key)) {\n      const value = obj[key];\n      // Skip functions.\n      if (typeof value != 'function') {\n        sb.push(sep);\n        this.serializeString_(key, sb);\n        sb.push(':');\n\n        this.serializeInternal(\n            this.replacer_ ? this.replacer_.call(obj, key, value) : value, sb);\n\n        sep = ',';\n      }\n    }\n  }\n  sb.push('}');\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\ngoog.provide('goog.async.WorkItem');\ngoog.provide('goog.async.WorkQueue');\n\ngoog.require('goog.asserts');\ngoog.require('goog.async.FreeList');\n\n\n// TODO(johnlenz): generalize the WorkQueue if this is used by more\n// than goog.async.run.\n\n\n\n/**\n * A low GC workqueue. The key elements of this design:\n *   - avoids the need for goog.bind or equivalent by carrying scope\n *   - avoids the need for array reallocation by using a linked list\n *   - minimizes work entry objects allocation by recycling objects\n * @constructor\n * @final\n * @struct\n */\ngoog.async.WorkQueue = function() {\n  this.workHead_ = null;\n  this.workTail_ = null;\n};\n\n\n/** @define {number} The maximum number of entries to keep for recycling. */\ngoog.async.WorkQueue.DEFAULT_MAX_UNUSED =\n    goog.define('goog.async.WorkQueue.DEFAULT_MAX_UNUSED', 100);\n\n\n/** @const @private {goog.async.FreeList<goog.async.WorkItem>} */\ngoog.async.WorkQueue.freelist_ = new goog.async.FreeList(\n    function() { return new goog.async.WorkItem(); },\n    function(item) { item.reset(); }, goog.async.WorkQueue.DEFAULT_MAX_UNUSED);\n\n\n/**\n * @param {function()} fn\n * @param {Object|null|undefined} scope\n */\ngoog.async.WorkQueue.prototype.add = function(fn, scope) {\n  var item = this.getUnusedItem_();\n  item.set(fn, scope);\n\n  if (this.workTail_) {\n    this.workTail_.next = item;\n    this.workTail_ = item;\n  } else {\n    goog.asserts.assert(!this.workHead_);\n    this.workHead_ = item;\n    this.workTail_ = item;\n  }\n};\n\n\n/**\n * @return {goog.async.WorkItem}\n */\ngoog.async.WorkQueue.prototype.remove = function() {\n  var item = null;\n\n  if (this.workHead_) {\n    item = this.workHead_;\n    this.workHead_ = this.workHead_.next;\n    if (!this.workHead_) {\n      this.workTail_ = null;\n    }\n    item.next = null;\n  }\n  return item;\n};\n\n\n/**\n * @param {goog.async.WorkItem} item\n */\ngoog.async.WorkQueue.prototype.returnUnused = function(item) {\n  goog.async.WorkQueue.freelist_.put(item);\n};\n\n\n/**\n * @return {goog.async.WorkItem}\n * @private\n */\ngoog.async.WorkQueue.prototype.getUnusedItem_ = function() {\n  return goog.async.WorkQueue.freelist_.get();\n};\n\n\n\n/**\n * @constructor\n * @final\n * @struct\n */\ngoog.async.WorkItem = function() {\n  /** @type {?function()} */\n  this.fn = null;\n  /** @type {?Object|null|undefined} */\n  this.scope = null;\n  /** @type {?goog.async.WorkItem} */\n  this.next = null;\n};\n\n\n/**\n * @param {function()} fn\n * @param {Object|null|undefined} scope\n */\ngoog.async.WorkItem.prototype.set = function(fn, scope) {\n  this.fn = fn;\n  this.scope = scope;\n  this.next = null;\n};\n\n\n/** Reset the work item so they don't prevent GC before reuse */\ngoog.async.WorkItem.prototype.reset = function() {\n  this.fn = null;\n  this.scope = null;\n  this.next = null;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\ngoog.provide('goog.async.run');\n\ngoog.require('goog.async.WorkQueue');\ngoog.require('goog.async.nextTick');\ngoog.require('goog.async.throwException');\n\n/**\n * @define {boolean} If true, use the global Promise to implement goog.async.run\n * assuming either the native, or polyfill version will be used. Does still\n * permit tests to use forceNextTick.\n */\ngoog.ASSUME_NATIVE_PROMISE = goog.define('goog.ASSUME_NATIVE_PROMISE', false);\n\n/**\n * Fires the provided callback just before the current callstack unwinds, or as\n * soon as possible after the current JS execution context.\n * @param {function(this:THIS)} callback\n * @param {THIS=} opt_context Object to use as the \"this value\" when calling\n *     the provided function.\n * @template THIS\n */\ngoog.async.run = function(callback, opt_context) {\n  if (!goog.async.run.schedule_) {\n    goog.async.run.initializeRunner_();\n  }\n  if (!goog.async.run.workQueueScheduled_) {\n    // Nothing is currently scheduled, schedule it now.\n    goog.async.run.schedule_();\n    goog.async.run.workQueueScheduled_ = true;\n  }\n\n  goog.async.run.workQueue_.add(callback, opt_context);\n};\n\n\n/**\n * Initializes the function to use to process the work queue.\n * @private\n */\ngoog.async.run.initializeRunner_ = function() {\n  if (goog.ASSUME_NATIVE_PROMISE ||\n      (goog.global.Promise && goog.global.Promise.resolve)) {\n    // Use goog.global.Promise instead of just Promise because the relevant\n    // externs may be missing, and don't alias it because this could confuse the\n    // compiler into thinking the polyfill is required when it should be treated\n    // as optional.\n    var promise = goog.global.Promise.resolve(undefined);\n    goog.async.run.schedule_ = function() {\n      promise.then(goog.async.run.processWorkQueue);\n    };\n  } else {\n    goog.async.run.schedule_ = function() {\n      goog.async.nextTick(goog.async.run.processWorkQueue);\n    };\n  }\n};\n\n\n/**\n * Forces goog.async.run to use nextTick instead of Promise.\n *\n * This should only be done in unit tests. It's useful because MockClock\n * replaces nextTick, but not the browser Promise implementation, so it allows\n * Promise-based code to be tested with MockClock.\n *\n * However, we also want to run promises if the MockClock is no longer in\n * control so we schedule a backup \"setTimeout\" to the unmocked timeout if\n * provided.\n *\n * @param {function(function())=} opt_realSetTimeout\n */\ngoog.async.run.forceNextTick = function(opt_realSetTimeout) {\n  goog.async.run.schedule_ = function() {\n    goog.async.nextTick(goog.async.run.processWorkQueue);\n    if (opt_realSetTimeout) {\n      opt_realSetTimeout(goog.async.run.processWorkQueue);\n    }\n  };\n};\n\n\n/**\n * The function used to schedule work asynchronousely.\n * @private {function()}\n */\ngoog.async.run.schedule_;\n\n\n/** @private {boolean} */\ngoog.async.run.workQueueScheduled_ = false;\n\n\n/** @private {!goog.async.WorkQueue} */\ngoog.async.run.workQueue_ = new goog.async.WorkQueue();\n\n\nif (goog.DEBUG) {\n  /**\n   * Reset the work queue. Only available for tests in debug mode.\n   */\n  goog.async.run.resetQueue = function() {\n    goog.async.run.workQueueScheduled_ = false;\n    goog.async.run.workQueue_ = new goog.async.WorkQueue();\n  };\n}\n\n\n/**\n * Run any pending goog.async.run work items. This function is not intended\n * for general use, but for use by entry point handlers to run items ahead of\n * goog.async.nextTick.\n */\ngoog.async.run.processWorkQueue = function() {\n  // NOTE: additional work queue items may be added while processing.\n  var item = null;\n  while (item = goog.async.run.workQueue_.remove()) {\n    try {\n      item.fn.call(item.scope);\n    } catch (e) {\n      goog.async.throwException(e);\n    }\n    goog.async.run.workQueue_.returnUnused(item);\n  }\n\n  // There are no more work items, allow processing to be scheduled again.\n  goog.async.run.workQueueScheduled_ = false;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Simple freelist.\n *\n * An anterative to goog.structs.SimplePool, it imposes the requirement that the\n * objects in the list contain a \"next\" property that can be used to maintain\n * the pool.\n */\n\ngoog.provide('goog.async.FreeList');\n\n\n/**\n * @template ITEM\n */\ngoog.async.FreeList = class {\n  /**\n   * @param {function():ITEM} create\n   * @param {function(ITEM):void} reset\n   * @param {number} limit\n   */\n  constructor(create, reset, limit) {\n    /** @private @const {number} */\n    this.limit_ = limit;\n    /** @private @const {function()} */\n    this.create_ = create;\n    /** @private @const {function(ITEM):void} */\n    this.reset_ = reset;\n\n    /** @private {number} */\n    this.occupants_ = 0;\n    /** @private {ITEM} */\n    this.head_ = null;\n  }\n\n  /**\n   * @return {ITEM}\n   */\n  get() {\n    let item;\n    if (this.occupants_ > 0) {\n      this.occupants_--;\n      item = this.head_;\n      this.head_ = item.next;\n      item.next = null;\n    } else {\n      item = this.create_();\n    }\n    return item;\n  }\n\n  /**\n   * @param {ITEM} item An item available for possible future reuse.\n   */\n  put(item) {\n    this.reset_(item);\n    if (this.occupants_ < this.limit_) {\n      this.occupants_++;\n      item.next = this.head_;\n      this.head_ = item;\n    }\n  }\n\n  /**\n   * Visible for testing.\n   * @package\n   * @return {number}\n   */\n  occupants() {\n    return this.occupants_;\n  }\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Provides a function to schedule running a function as soon\n * as possible after the current JS execution stops and yields to the event\n * loop.\n */\n\ngoog.provide('goog.async.nextTick');\ngoog.provide('goog.async.throwException');\n\ngoog.require('goog.debug.entryPointRegistry');\ngoog.require('goog.dom');\ngoog.require('goog.dom.TagName');\ngoog.require('goog.dom.safe');\ngoog.require('goog.functions');\ngoog.require('goog.html.SafeHtml');\ngoog.require('goog.html.TrustedResourceUrl');\ngoog.require('goog.labs.userAgent.browser');\ngoog.require('goog.labs.userAgent.engine');\ngoog.require('goog.string.Const');\n\n\n/**\n * Throw an item without interrupting the current execution context.  For\n * example, if processing a group of items in a loop, sometimes it is useful\n * to report an error while still allowing the rest of the batch to be\n * processed.\n * @param {*} exception\n */\ngoog.async.throwException = function(exception) {\n  // Each throw needs to be in its own context.\n  goog.global.setTimeout(function() { throw exception; }, 0);\n};\n\n\n/**\n * Fires the provided callbacks as soon as possible after the current JS\n * execution context. setTimeout(…, 0) takes at least 4ms when called from\n * within another setTimeout(…, 0) for legacy reasons.\n *\n * This will not schedule the callback as a microtask (i.e. a task that can\n * preempt user input or networking callbacks). It is meant to emulate what\n * setTimeout(_, 0) would do if it were not throttled. If you desire microtask\n * behavior, use {@see goog.Promise} instead.\n *\n * @param {function(this:SCOPE)} callback Callback function to fire as soon as\n *     possible.\n * @param {SCOPE=} opt_context Object in whose scope to call the listener.\n * @param {boolean=} opt_useSetImmediate Avoid the IE workaround that\n *     ensures correctness at the cost of speed. See comments for details.\n * @template SCOPE\n */\ngoog.async.nextTick = function(callback, opt_context, opt_useSetImmediate) {\n  var cb = callback;\n  if (opt_context) {\n    cb = goog.bind(callback, opt_context);\n  }\n  cb = goog.async.nextTick.wrapCallback_(cb);\n  // Note we do allow callers to also request setImmediate if they are willing\n  // to accept the possible tradeoffs of incorrectness in exchange for speed.\n  // The IE fallback of readystate change is much slower. See useSetImmediate_\n  // for details.\n  if (goog.isFunction(goog.global.setImmediate) &&\n      (opt_useSetImmediate || goog.async.nextTick.useSetImmediate_())) {\n    goog.global.setImmediate(cb);\n    return;\n  }\n\n  // Look for and cache the custom fallback version of setImmediate.\n  if (!goog.async.nextTick.setImmediate_) {\n    goog.async.nextTick.setImmediate_ =\n        goog.async.nextTick.getSetImmediateEmulator_();\n  }\n  goog.async.nextTick.setImmediate_(cb);\n};\n\n\n/**\n * Returns whether should use setImmediate implementation currently on window.\n *\n * window.setImmediate was introduced and currently only supported by IE10+,\n * but due to a bug in the implementation it is not guaranteed that\n * setImmediate is faster than setTimeout nor that setImmediate N is before\n * setImmediate N+1. That is why we do not use the native version if\n * available. We do, however, call setImmediate if it is a non-native function\n * because that indicates that it has been replaced by goog.testing.MockClock\n * which we do want to support.\n * See\n * http://connect.microsoft.com/IE/feedback/details/801823/setimmediate-and-messagechannel-are-broken-in-ie10\n *\n * @return {boolean} Whether to use the implementation of setImmediate defined\n *     on Window.\n * @private\n * @suppress {missingProperties} For \"Window.prototype.setImmediate\"\n */\ngoog.async.nextTick.useSetImmediate_ = function() {\n  // Not a browser environment.\n  if (!goog.global.Window || !goog.global.Window.prototype) {\n    return true;\n  }\n\n  // MS Edge has window.setImmediate natively, but it's not on Window.prototype.\n  // Also, there's no clean way to detect if the goog.global.setImmediate has\n  // been replaced by mockClock as its replacement also shows up as \"[native\n  // code]\" when using toString. Therefore, just always use\n  // goog.global.setImmediate for Edge. It's unclear if it suffers the same\n  // issues as IE10/11, but based on\n  // https://dev.modern.ie/testdrive/demos/setimmediatesorting/\n  // it seems they've been working to ensure it's WAI.\n  if (goog.labs.userAgent.browser.isEdge() ||\n      goog.global.Window.prototype.setImmediate != goog.global.setImmediate) {\n    // Something redefined setImmediate in which case we decide to use it (This\n    // is so that we use the mockClock setImmediate).\n    return true;\n  }\n\n  return false;\n};\n\n\n/**\n * Cache for the setImmediate implementation.\n * @type {function(function())}\n * @private\n */\ngoog.async.nextTick.setImmediate_;\n\n\n/**\n * Determines the best possible implementation to run a function as soon as\n * the JS event loop is idle.\n * @return {function(function())} The \"setImmediate\" implementation.\n * @private\n */\ngoog.async.nextTick.getSetImmediateEmulator_ = function() {\n  // Create a private message channel and use it to postMessage empty messages\n  // to ourselves.\n  /** @type {!Function|undefined} */\n  var Channel = goog.global['MessageChannel'];\n  // If MessageChannel is not available and we are in a browser, implement\n  // an iframe based polyfill in browsers that have postMessage and\n  // document.addEventListener. The latter excludes IE8 because it has a\n  // synchronous postMessage implementation.\n  if (typeof Channel === 'undefined' && typeof window !== 'undefined' &&\n      window.postMessage && window.addEventListener &&\n      // Presto (The old pre-blink Opera engine) has problems with iframes\n      // and contentWindow.\n      !goog.labs.userAgent.engine.isPresto()) {\n    /** @constructor */\n    Channel = function() {\n      // Make an empty, invisible iframe.\n      var iframe = goog.dom.createElement(goog.dom.TagName.IFRAME);\n      iframe.style.display = 'none';\n      goog.dom.safe.setIframeSrc(\n          iframe,\n          goog.html.TrustedResourceUrl.fromConstant(goog.string.Const.EMPTY));\n      document.documentElement.appendChild(iframe);\n      var win = iframe.contentWindow;\n      var doc = win.document;\n      doc.open();\n      goog.dom.safe.documentWrite(doc, goog.html.SafeHtml.EMPTY);\n      doc.close();\n      // Do not post anything sensitive over this channel, as the workaround for\n      // pages with file: origin could allow that information to be modified or\n      // intercepted.\n      var message = 'callImmediate' + Math.random();\n      // The same origin policy rejects attempts to postMessage from file: urls\n      // unless the origin is '*'.\n      var origin = win.location.protocol == 'file:' ?\n          '*' :\n          win.location.protocol + '//' + win.location.host;\n      var onmessage = goog.bind(function(e) {\n        // Validate origin and message to make sure that this message was\n        // intended for us. If the origin is set to '*' (see above) only the\n        // message needs to match since, for example, '*' != 'file://'. Allowing\n        // the wildcard is ok, as we are not concerned with security here.\n        if ((origin != '*' && e.origin != origin) || e.data != message) {\n          return;\n        }\n        this['port1'].onmessage();\n      }, this);\n      win.addEventListener('message', onmessage, false);\n      this['port1'] = {};\n      this['port2'] = {\n        postMessage: function() { win.postMessage(message, origin); }\n      };\n    };\n  }\n  if (typeof Channel !== 'undefined' && !goog.labs.userAgent.browser.isIE()) {\n    // Exclude all of IE due to\n    // http://codeforhire.com/2013/09/21/setimmediate-and-messagechannel-broken-on-internet-explorer-10/\n    // which allows starving postMessage with a busy setTimeout loop.\n    // This currently affects IE10 and IE11 which would otherwise be able\n    // to use the postMessage based fallbacks.\n    var channel = new Channel();\n    // Use a fifo linked list to call callbacks in the right order.\n    var head = {};\n    var tail = head;\n    channel['port1'].onmessage = function() {\n      if (head.next !== undefined) {\n        head = head.next;\n        var cb = head.cb;\n        head.cb = null;\n        cb();\n      }\n    };\n    return function(cb) {\n      tail.next = {cb: cb};\n      tail = tail.next;\n      channel['port2'].postMessage(0);\n    };\n  }\n  // Fall back to setTimeout with 0. In browsers this creates a delay of 5ms\n  // or more.\n  // NOTE(user): This fallback is used for IE.\n  return function(cb) {\n    goog.global.setTimeout(/** @type {function()} */ (cb), 0);\n  };\n};\n\n\n/**\n * Helper function that is overrided to protect callbacks with entry point\n * monitor if the application monitors entry points.\n * @param {function()} callback Callback function to fire as soon as possible.\n * @return {function()} The wrapped callback.\n * @private\n */\ngoog.async.nextTick.wrapCallback_ = goog.functions.identity;\n\n\n// Register the callback function as an entry point, so that it can be\n// monitored for exception handling, etc. This has to be done in this file\n// since it requires special code to handle all browsers.\ngoog.debug.entryPointRegistry.register(\n    /**\n     * @param {function(!Function): !Function} transformer The transforming\n     *     function.\n     */\n    function(transformer) { goog.async.nextTick.wrapCallback_ = transformer; });\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview A timer class to which other classes and objects can listen on.\n * This is only an abstraction above `setInterval`.\n *\n * @see ../demos/timers.html\n */\n\ngoog.provide('goog.Timer');\n\ngoog.require('goog.Promise');\ngoog.require('goog.events.EventTarget');\n\n\n\n/**\n * Class for handling timing events.\n *\n * @param {number=} opt_interval Number of ms between ticks (default: 1ms).\n * @param {Object=} opt_timerObject  An object that has `setTimeout`,\n *     `setInterval`, `clearTimeout` and `clearInterval`\n *     (e.g., `window`).\n * @constructor\n * @extends {goog.events.EventTarget}\n */\ngoog.Timer = function(opt_interval, opt_timerObject) {\n  goog.events.EventTarget.call(this);\n\n  /**\n   * Number of ms between ticks\n   * @private {number}\n   */\n  this.interval_ = opt_interval || 1;\n\n  /**\n   * An object that implements `setTimeout`, `setInterval`,\n   * `clearTimeout` and `clearInterval`. We default to the window\n   * object. Changing this on {@link goog.Timer.prototype} changes the object\n   * for all timer instances which can be useful if your environment has some\n   * other implementation of timers than the `window` object.\n   * @private {{setTimeout:!Function, clearTimeout:!Function}}\n   */\n  this.timerObject_ = /** @type {{setTimeout, clearTimeout}} */ (\n      opt_timerObject || goog.Timer.defaultTimerObject);\n\n  /**\n   * Cached `tick_` bound to the object for later use in the timer.\n   * @private {Function}\n   * @const\n   */\n  this.boundTick_ = goog.bind(this.tick_, this);\n\n  /**\n   * Firefox browser often fires the timer event sooner (sometimes MUCH sooner)\n   * than the requested timeout. So we compare the time to when the event was\n   * last fired, and reschedule if appropriate. See also\n   * {@link goog.Timer.intervalScale}.\n   * @private {number}\n   */\n  this.last_ = goog.now();\n};\ngoog.inherits(goog.Timer, goog.events.EventTarget);\n\n\n/**\n * Maximum timeout value.\n *\n * Timeout values too big to fit into a signed 32-bit integer may cause overflow\n * in FF, Safari, and Chrome, resulting in the timeout being scheduled\n * immediately. It makes more sense simply not to schedule these timeouts, since\n * 24.8 days is beyond a reasonable expectation for the browser to stay open.\n *\n * @private {number}\n * @const\n */\ngoog.Timer.MAX_TIMEOUT_ = 2147483647;\n\n\n/**\n * A timer ID that cannot be returned by any known implementation of\n * `window.setTimeout`. Passing this value to `window.clearTimeout`\n * should therefore be a no-op.\n *\n * @private {number}\n * @const\n */\ngoog.Timer.INVALID_TIMEOUT_ID_ = -1;\n\n\n/**\n * Whether this timer is enabled\n * @type {boolean}\n */\ngoog.Timer.prototype.enabled = false;\n\n\n/**\n * An object that implements `setTimeout`, `setInterval`,\n * `clearTimeout` and `clearInterval`. We default to the global\n * object. Changing `goog.Timer.defaultTimerObject` changes the object for\n * all timer instances which can be useful if your environment has some other\n * implementation of timers you'd like to use.\n * @type {{setTimeout, clearTimeout}}\n */\ngoog.Timer.defaultTimerObject = goog.global;\n\n\n/**\n * Variable that controls the timer error correction. If the timer is called\n * before the requested interval times `intervalScale`, which often\n * happens on Mozilla, the timer is rescheduled.\n * @see {@link #last_}\n * @type {number}\n */\ngoog.Timer.intervalScale = 0.8;\n\n\n/**\n * Variable for storing the result of `setInterval`.\n * @private {?number}\n */\ngoog.Timer.prototype.timer_ = null;\n\n\n/**\n * Gets the interval of the timer.\n * @return {number} interval Number of ms between ticks.\n */\ngoog.Timer.prototype.getInterval = function() {\n  return this.interval_;\n};\n\n\n/**\n * Sets the interval of the timer.\n * @param {number} interval Number of ms between ticks.\n */\ngoog.Timer.prototype.setInterval = function(interval) {\n  this.interval_ = interval;\n  if (this.timer_ && this.enabled) {\n    // Stop and then start the timer to reset the interval.\n    this.stop();\n    this.start();\n  } else if (this.timer_) {\n    this.stop();\n  }\n};\n\n\n/**\n * Callback for the `setTimeout` used by the timer.\n * @private\n */\ngoog.Timer.prototype.tick_ = function() {\n  if (this.enabled) {\n    var elapsed = goog.now() - this.last_;\n    if (elapsed > 0 && elapsed < this.interval_ * goog.Timer.intervalScale) {\n      this.timer_ = this.timerObject_.setTimeout(\n          this.boundTick_, this.interval_ - elapsed);\n      return;\n    }\n\n    // Prevents setInterval from registering a duplicate timeout when called\n    // in the timer event handler.\n    if (this.timer_) {\n      this.timerObject_.clearTimeout(this.timer_);\n      this.timer_ = null;\n    }\n\n    this.dispatchTick();\n    // The timer could be stopped in the timer event handler.\n    if (this.enabled) {\n      // Stop and start to ensure there is always only one timeout even if\n      // start is called in the timer event handler.\n      this.stop();\n      this.start();\n    }\n  }\n};\n\n\n/**\n * Dispatches the TICK event. This is its own method so subclasses can override.\n */\ngoog.Timer.prototype.dispatchTick = function() {\n  this.dispatchEvent(goog.Timer.TICK);\n};\n\n\n/**\n * Starts the timer.\n */\ngoog.Timer.prototype.start = function() {\n  this.enabled = true;\n\n  // If there is no interval already registered, start it now\n  if (!this.timer_) {\n    // IMPORTANT!\n    // window.setInterval in FireFox has a bug - it fires based on\n    // absolute time, rather than on relative time. What this means\n    // is that if a computer is sleeping/hibernating for 24 hours\n    // and the timer interval was configured to fire every 1000ms,\n    // then after the PC wakes up the timer will fire, in rapid\n    // succession, 3600*24 times.\n    // This bug is described here and is already fixed, but it will\n    // take time to propagate, so for now I am switching this over\n    // to setTimeout logic.\n    //     https://bugzilla.mozilla.org/show_bug.cgi?id=376643\n    //\n    this.timer_ = this.timerObject_.setTimeout(this.boundTick_, this.interval_);\n    this.last_ = goog.now();\n  }\n};\n\n\n/**\n * Stops the timer.\n */\ngoog.Timer.prototype.stop = function() {\n  this.enabled = false;\n  if (this.timer_) {\n    this.timerObject_.clearTimeout(this.timer_);\n    this.timer_ = null;\n  }\n};\n\n\n/** @override */\ngoog.Timer.prototype.disposeInternal = function() {\n  goog.Timer.superClass_.disposeInternal.call(this);\n  this.stop();\n  delete this.timerObject_;\n};\n\n\n/**\n * Constant for the timer's event type.\n * @const\n */\ngoog.Timer.TICK = 'tick';\n\n\n/**\n * Calls the given function once, after the optional pause.\n * <p>\n * The function is always called asynchronously, even if the delay is 0. This\n * is a common trick to schedule a function to run after a batch of browser\n * event processing.\n *\n * @param {function(this:SCOPE)|{handleEvent:function()}|null} listener Function\n *     or object that has a handleEvent method.\n * @param {number=} opt_delay Milliseconds to wait; default is 0.\n * @param {SCOPE=} opt_handler Object in whose scope to call the listener.\n * @return {number} A handle to the timer ID.\n * @template SCOPE\n */\ngoog.Timer.callOnce = function(listener, opt_delay, opt_handler) {\n  if (goog.isFunction(listener)) {\n    if (opt_handler) {\n      listener = goog.bind(listener, opt_handler);\n    }\n  } else if (listener && typeof listener.handleEvent == 'function') {\n    // using typeof to prevent strict js warning\n    listener = goog.bind(listener.handleEvent, listener);\n  } else {\n    throw new Error('Invalid listener argument');\n  }\n\n  if (Number(opt_delay) > goog.Timer.MAX_TIMEOUT_) {\n    // Timeouts greater than MAX_INT return immediately due to integer\n    // overflow in many browsers.  Since MAX_INT is 24.8 days, just don't\n    // schedule anything at all.\n    return goog.Timer.INVALID_TIMEOUT_ID_;\n  } else {\n    return goog.Timer.defaultTimerObject.setTimeout(listener, opt_delay || 0);\n  }\n};\n\n\n/**\n * Clears a timeout initiated by {@link #callOnce}.\n * @param {?number} timerId A timer ID.\n */\ngoog.Timer.clear = function(timerId) {\n  goog.Timer.defaultTimerObject.clearTimeout(timerId);\n};\n\n\n/**\n * @param {number} delay Milliseconds to wait.\n * @param {(RESULT|goog.Thenable<RESULT>|Thenable)=} opt_result The value\n *     with which the promise will be resolved.\n * @return {!goog.Promise<RESULT>} A promise that will be resolved after\n *     the specified delay, unless it is canceled first.\n * @template RESULT\n */\ngoog.Timer.promise = function(delay, opt_result) {\n  var timerKey = null;\n  return new goog\n      .Promise(function(resolve, reject) {\n        timerKey =\n            goog.Timer.callOnce(function() { resolve(opt_result); }, delay);\n        if (timerKey == goog.Timer.INVALID_TIMEOUT_ID_) {\n          reject(new Error('Failed to schedule timer.'));\n        }\n      })\n      .thenCatch(function(error) {\n        // Clear the timer. The most likely reason is \"cancel\" signal.\n        goog.Timer.clear(timerKey);\n        throw error;\n      });\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Definition of the goog.async.Throttle class.\n *\n * @see ../demos/timers.html\n */\n\ngoog.provide('goog.Throttle');\ngoog.provide('goog.async.Throttle');\n\ngoog.require('goog.Disposable');\ngoog.require('goog.Timer');\n\n\n\n/**\n * Throttle will perform an action that is passed in no more than once\n * per interval (specified in milliseconds). If it gets multiple signals\n * to perform the action while it is waiting, it will only perform the action\n * once at the end of the interval.\n * @param {function(this: T, ...?)} listener Function to callback when the\n *     action is triggered.\n * @param {number} interval Interval over which to throttle. The listener can\n *     only be called once per interval.\n * @param {T=} opt_handler Object in whose scope to call the listener.\n * @constructor\n * @struct\n * @extends {goog.Disposable}\n * @final\n * @template T\n */\ngoog.async.Throttle = function(listener, interval, opt_handler) {\n  goog.async.Throttle.base(this, 'constructor');\n\n  /**\n   * Function to callback\n   * @type {function(this: T, ...?)}\n   * @private\n   */\n  this.listener_ =\n      opt_handler != null ? goog.bind(listener, opt_handler) : listener;\n\n  /**\n   * Interval for the throttle time\n   * @type {number}\n   * @private\n   */\n  this.interval_ = interval;\n\n  /**\n   * Cached callback function invoked after the throttle timeout completes\n   * @type {Function}\n   * @private\n   */\n  this.callback_ = goog.bind(this.onTimer_, this);\n\n  /**\n   * The last arguments passed into `fire`.\n   * @private {!IArrayLike}\n   */\n  this.args_ = [];\n};\ngoog.inherits(goog.async.Throttle, goog.Disposable);\n\n\n\n/**\n * A deprecated alias.\n * @deprecated Use goog.async.Throttle instead.\n * @constructor\n * @final\n */\ngoog.Throttle = goog.async.Throttle;\n\n\n/**\n * Indicates that the action is pending and needs to be fired.\n * @type {boolean}\n * @private\n */\ngoog.async.Throttle.prototype.shouldFire_ = false;\n\n\n/**\n * Indicates the count of nested pauses currently in effect on the throttle.\n * When this count is not zero, fired actions will be postponed until the\n * throttle is resumed enough times to drop the pause count to zero.\n * @type {number}\n * @private\n */\ngoog.async.Throttle.prototype.pauseCount_ = 0;\n\n\n/**\n * Timer for scheduling the next callback\n * @type {?number}\n * @private\n */\ngoog.async.Throttle.prototype.timer_ = null;\n\n\n/**\n * Notifies the throttle that the action has happened. It will throttle the call\n * so that the callback is not called too often according to the interval\n * parameter passed to the constructor, passing the arguments from the last call\n * of this function into the throttled function.\n * @param {...?} var_args Arguments to pass on to the throttled function.\n */\ngoog.async.Throttle.prototype.fire = function(var_args) {\n  this.args_ = arguments;\n  if (!this.timer_ && !this.pauseCount_) {\n    this.doAction_();\n  } else {\n    this.shouldFire_ = true;\n  }\n};\n\n\n/**\n * Cancels any pending action callback. The throttle can be restarted by\n * calling {@link #fire}.\n */\ngoog.async.Throttle.prototype.stop = function() {\n  if (this.timer_) {\n    goog.Timer.clear(this.timer_);\n    this.timer_ = null;\n    this.shouldFire_ = false;\n    this.args_ = [];\n  }\n};\n\n\n/**\n * Pauses the throttle.  All pending and future action callbacks will be\n * delayed until the throttle is resumed.  Pauses can be nested.\n */\ngoog.async.Throttle.prototype.pause = function() {\n  this.pauseCount_++;\n};\n\n\n/**\n * Resumes the throttle.  If doing so drops the pausing count to zero, pending\n * action callbacks will be executed as soon as possible, but still no sooner\n * than an interval's delay after the previous call.  Future action callbacks\n * will be executed as normal.\n */\ngoog.async.Throttle.prototype.resume = function() {\n  this.pauseCount_--;\n  if (!this.pauseCount_ && this.shouldFire_ && !this.timer_) {\n    this.shouldFire_ = false;\n    this.doAction_();\n  }\n};\n\n\n/** @override */\ngoog.async.Throttle.prototype.disposeInternal = function() {\n  goog.async.Throttle.base(this, 'disposeInternal');\n  this.stop();\n};\n\n\n/**\n * Handler for the timer to fire the throttle\n * @private\n */\ngoog.async.Throttle.prototype.onTimer_ = function() {\n  this.timer_ = null;\n\n  if (this.shouldFire_ && !this.pauseCount_) {\n    this.shouldFire_ = false;\n    this.doAction_();\n  }\n};\n\n\n/**\n * Calls the callback\n * @private\n */\ngoog.async.Throttle.prototype.doAction_ = function() {\n  this.timer_ = goog.Timer.callOnce(this.callback_, this.interval_);\n  this.listener_.apply(null, this.args_);\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Class to create objects which want to handle multiple events\n * and have their listeners easily cleaned up via a dispose method.\n *\n * Example:\n * <pre>\n * function Something() {\n *   Something.base(this);\n *\n *   ... set up object ...\n *\n *   // Add event listeners\n *   this.listen(this.starEl, goog.events.EventType.CLICK, this.handleStar);\n *   this.listen(this.headerEl, goog.events.EventType.CLICK, this.expand);\n *   this.listen(this.collapseEl, goog.events.EventType.CLICK, this.collapse);\n *   this.listen(this.infoEl, goog.events.EventType.MOUSEOVER, this.showHover);\n *   this.listen(this.infoEl, goog.events.EventType.MOUSEOUT, this.hideHover);\n * }\n * goog.inherits(Something, goog.events.EventHandler);\n *\n * Something.prototype.disposeInternal = function() {\n *   Something.base(this, 'disposeInternal');\n *   goog.dom.removeNode(this.container);\n * };\n *\n *\n * // Then elsewhere:\n *\n * var activeSomething = null;\n * function openSomething() {\n *   activeSomething = new Something();\n * }\n *\n * function closeSomething() {\n *   if (activeSomething) {\n *     activeSomething.dispose();  // Remove event listeners\n *     activeSomething = null;\n *   }\n * }\n * </pre>\n */\n\ngoog.provide('goog.events.EventHandler');\n\ngoog.forwardDeclare('goog.events.EventWrapper');\ngoog.require('goog.Disposable');\ngoog.require('goog.events');\ngoog.require('goog.object');\ngoog.requireType('goog.events.EventTarget');\n\n\n\n/**\n * Super class for objects that want to easily manage a number of event\n * listeners.  It allows a short cut to listen and also provides a quick way\n * to remove all events listeners belonging to this object.\n * @param {SCOPE=} opt_scope Object in whose scope to call the listeners.\n * @constructor\n * @extends {goog.Disposable}\n * @template SCOPE\n */\ngoog.events.EventHandler = function(opt_scope) {\n  goog.Disposable.call(this);\n  // TODO(mknichel): Rename this to this.scope_ and fix the classes in google3\n  // that access this private variable. :(\n  this.handler_ = opt_scope;\n\n  /**\n   * Keys for events that are being listened to.\n   * @type {!Object<!goog.events.Key>}\n   * @private\n   */\n  this.keys_ = {};\n};\ngoog.inherits(goog.events.EventHandler, goog.Disposable);\n\n\n/**\n * Utility array used to unify the cases of listening for an array of types\n * and listening for a single event, without using recursion or allocating\n * an array each time.\n * @type {!Array<string>}\n * @const\n * @private\n */\ngoog.events.EventHandler.typeArray_ = [];\n\n\n/**\n * Listen to an event on a Listenable.  If the function is omitted then the\n * EventHandler's handleEvent method will be used.\n * @param {goog.events.ListenableType} src Event source.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type to listen for or array of event types.\n * @param {function(this:SCOPE, EVENTOBJ):?|{handleEvent:function(?):?}|null=}\n *     opt_fn Optional callback function to be used as the listener or an object\n *     with handleEvent function.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template EVENTOBJ, THIS\n */\ngoog.events.EventHandler.prototype.listen = function(\n    src, type, opt_fn, opt_options) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  return self.listen_(src, type, opt_fn, opt_options);\n};\n\n\n/**\n * Listen to an event on a Listenable.  If the function is omitted then the\n * EventHandler's handleEvent method will be used.\n * @param {goog.events.ListenableType} src Event source.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type to listen for or array of event types.\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(this:T, ?):?}|\n *     null|undefined} fn Optional callback function to be used as the\n *     listener or an object with handleEvent function.\n * @param {boolean|!AddEventListenerOptions|undefined} options\n * @param {T} scope Object in whose scope to call the listener.\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template T, EVENTOBJ, THIS\n */\ngoog.events.EventHandler.prototype.listenWithScope = function(\n    src, type, fn, options, scope) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  // TODO(mknichel): Deprecate this function.\n  return self.listen_(src, type, fn, options, scope);\n};\n\n\n/**\n * Listen to an event on a Listenable.  If the function is omitted then the\n * EventHandler's handleEvent method will be used.\n * @param {goog.events.ListenableType} src Event source.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type to listen for or array of event types.\n * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null=} opt_fn\n *     Optional callback function to be used as the listener or an object with\n *     handleEvent function.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @param {Object=} opt_scope Object in whose scope to call the listener.\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template EVENTOBJ, THIS\n * @private\n */\ngoog.events.EventHandler.prototype.listen_ = function(\n    src, type, opt_fn, opt_options, opt_scope) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  if (!Array.isArray(type)) {\n    if (type) {\n      goog.events.EventHandler.typeArray_[0] = type.toString();\n    }\n    type = goog.events.EventHandler.typeArray_;\n  }\n  for (var i = 0; i < type.length; i++) {\n    var listenerObj = goog.events.listen(\n        src, type[i], opt_fn || self.handleEvent, opt_options || false,\n        opt_scope || self.handler_ || self);\n\n    if (!listenerObj) {\n      // When goog.events.listen run on OFF_AND_FAIL or OFF_AND_SILENT\n      // (goog.events.CaptureSimulationMode) in IE8-, it will return null\n      // value.\n      return self;\n    }\n\n    var key = listenerObj.key;\n    self.keys_[key] = listenerObj;\n  }\n\n  return self;\n};\n\n\n/**\n * Listen to an event on a Listenable.  If the function is omitted, then the\n * EventHandler's handleEvent method will be used. After the event has fired the\n * event listener is removed from the target. If an array of event types is\n * provided, each event type will be listened to once.\n * @param {goog.events.ListenableType} src Event source.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type to listen for or array of event types.\n * @param {function(this:SCOPE, EVENTOBJ):?|{handleEvent:function(?):?}|null=}\n * opt_fn\n *    Optional callback function to be used as the listener or an object with\n *    handleEvent function.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template EVENTOBJ, THIS\n */\ngoog.events.EventHandler.prototype.listenOnce = function(\n    src, type, opt_fn, opt_options) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  return self.listenOnce_(src, type, opt_fn, opt_options);\n};\n\n\n/**\n * Listen to an event on a Listenable.  If the function is omitted, then the\n * EventHandler's handleEvent method will be used. After the event has fired the\n * event listener is removed from the target. If an array of event types is\n * provided, each event type will be listened to once.\n * @param {goog.events.ListenableType} src Event source.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type to listen for or array of event types.\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(this:T, ?):?}|\n *     null|undefined} fn Optional callback function to be used as the\n *     listener or an object with handleEvent function.\n * @param {boolean|undefined} capture Optional whether to use capture phase.\n * @param {T} scope Object in whose scope to call the listener.\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template T, EVENTOBJ, THIS\n */\ngoog.events.EventHandler.prototype.listenOnceWithScope = function(\n    src, type, fn, capture, scope) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  // TODO(mknichel): Deprecate this function.\n  return self.listenOnce_(src, type, fn, capture, scope);\n};\n\n\n/**\n * Listen to an event on a Listenable.  If the function is omitted, then the\n * EventHandler's handleEvent method will be used. After the event has fired\n * the event listener is removed from the target. If an array of event types is\n * provided, each event type will be listened to once.\n * @param {goog.events.ListenableType} src Event source.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type to listen for or array of event types.\n * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null=} opt_fn\n *    Optional callback function to be used as the listener or an object with\n *    handleEvent function.\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\n * @param {Object=} opt_scope Object in whose scope to call the listener.\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template EVENTOBJ, THIS\n * @private\n */\ngoog.events.EventHandler.prototype.listenOnce_ = function(\n    src, type, opt_fn, opt_options, opt_scope) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  if (Array.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      self.listenOnce_(src, type[i], opt_fn, opt_options, opt_scope);\n    }\n  } else {\n    var listenerObj = goog.events.listenOnce(\n        src, type, opt_fn || self.handleEvent, opt_options,\n        opt_scope || self.handler_ || self);\n    if (!listenerObj) {\n      // When goog.events.listen run on OFF_AND_FAIL or OFF_AND_SILENT\n      // (goog.events.CaptureSimulationMode) in IE8-, it will return null\n      // value.\n      return self;\n    }\n\n    var key = listenerObj.key;\n    self.keys_[key] = listenerObj;\n  }\n\n  return self;\n};\n\n\n/**\n * Adds an event listener with a specific event wrapper on a DOM Node or an\n * object that has implemented {@link goog.events.EventTarget}. A listener can\n * only be added once to an object.\n *\n * @param {EventTarget|goog.events.EventTarget} src The node to listen to\n *     events on.\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\n * @param {function(this:SCOPE, ?):?|{handleEvent:function(?):?}|null} listener\n *     Callback method, or an object with a handleEvent function.\n * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to\n *     false).\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template THIS\n */\ngoog.events.EventHandler.prototype.listenWithWrapper = function(\n    src, wrapper, listener, opt_capt) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  // TODO(mknichel): Remove the opt_scope from this function and then\n  // templatize it.\n  return self.listenWithWrapper_(src, wrapper, listener, opt_capt);\n};\n\n\n/**\n * Adds an event listener with a specific event wrapper on a DOM Node or an\n * object that has implemented {@link goog.events.EventTarget}. A listener can\n * only be added once to an object.\n *\n * @param {EventTarget|goog.events.EventTarget} src The node to listen to\n *     events on.\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\n * @param {function(this:T, ?):?|{handleEvent:function(this:T, ?):?}|null}\n *     listener Optional callback function to be used as the\n *     listener or an object with handleEvent function.\n * @param {boolean|undefined} capture Optional whether to use capture phase.\n * @param {T} scope Object in whose scope to call the listener.\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template T, THIS\n */\ngoog.events.EventHandler.prototype.listenWithWrapperAndScope = function(\n    src, wrapper, listener, capture, scope) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  // TODO(mknichel): Deprecate this function.\n  return self.listenWithWrapper_(src, wrapper, listener, capture, scope);\n};\n\n\n/**\n * Adds an event listener with a specific event wrapper on a DOM Node or an\n * object that has implemented {@link goog.events.EventTarget}. A listener can\n * only be added once to an object.\n *\n * @param {EventTarget|goog.events.EventTarget} src The node to listen to\n *     events on.\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener Callback\n *     method, or an object with a handleEvent function.\n * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to\n *     false).\n * @param {Object=} opt_scope Element in whose scope to call the listener.\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template THIS\n * @private\n */\ngoog.events.EventHandler.prototype.listenWithWrapper_ = function(\n    src, wrapper, listener, opt_capt, opt_scope) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  wrapper.listen(\n      src, listener, opt_capt, opt_scope || self.handler_ || self, self);\n  return self;\n};\n\n\n/**\n * @return {number} Number of listeners registered by this handler.\n */\ngoog.events.EventHandler.prototype.getListenerCount = function() {\n  var count = 0;\n  for (var key in this.keys_) {\n    if (Object.prototype.hasOwnProperty.call(this.keys_, key)) {\n      count++;\n    }\n  }\n  return count;\n};\n\n\n/**\n * Unlistens on an event.\n * @param {goog.events.ListenableType} src Event source.\n * @param {string|Array<string>|\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\n *     type Event type or array of event types to unlisten to.\n * @param {function(this:?, EVENTOBJ):?|{handleEvent:function(?):?}|null=}\n *     opt_fn Optional callback function to be used as the listener or an object\n *     with handleEvent function.\n * @param {(boolean|!EventListenerOptions)=} opt_options\n * @param {Object=} opt_scope Object in whose scope to call the listener.\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template EVENTOBJ, THIS\n */\ngoog.events.EventHandler.prototype.unlisten = function(\n    src, type, opt_fn, opt_options, opt_scope) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  if (Array.isArray(type)) {\n    for (var i = 0; i < type.length; i++) {\n      self.unlisten(src, type[i], opt_fn, opt_options, opt_scope);\n    }\n  } else {\n    var capture =\n        goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\n    var listener = goog.events.getListener(\n        src, type, opt_fn || self.handleEvent, capture,\n        opt_scope || self.handler_ || self);\n\n    if (listener) {\n      goog.events.unlistenByKey(listener);\n      delete self.keys_[listener.key];\n    }\n  }\n\n  return self;\n};\n\n\n/**\n * Removes an event listener which was added with listenWithWrapper().\n *\n * @param {EventTarget|goog.events.EventTarget} src The target to stop\n *     listening to events on.\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener The\n *     listener function to remove.\n * @param {boolean=} opt_capt In DOM-compliant browsers, this determines\n *     whether the listener is fired during the capture or bubble phase of the\n *     event.\n * @param {Object=} opt_scope Element in whose scope to call the listener.\n * @return {THIS} This object, allowing for chaining of calls.\n * @this {THIS}\n * @template THIS\n */\ngoog.events.EventHandler.prototype.unlistenWithWrapper = function(\n    src, wrapper, listener, opt_capt, opt_scope) {\n  var self = /** @type {!goog.events.EventHandler} */ (this);\n  wrapper.unlisten(\n      src, listener, opt_capt, opt_scope || self.handler_ || self, self);\n  return self;\n};\n\n\n/**\n * Unlistens to all events.\n */\ngoog.events.EventHandler.prototype.removeAll = function() {\n  goog.object.forEach(this.keys_, function(listenerObj, key) {\n    if (this.keys_.hasOwnProperty(key)) {\n      goog.events.unlistenByKey(listenerObj);\n    }\n  }, this);\n\n  this.keys_ = {};\n};\n\n\n/**\n * Disposes of this EventHandler and removes all listeners that it registered.\n * @override\n * @protected\n */\ngoog.events.EventHandler.prototype.disposeInternal = function() {\n  goog.events.EventHandler.superClass_.disposeInternal.call(this);\n  this.removeAll();\n};\n\n\n/**\n * Default event handler\n * @param {goog.events.Event} e Event object.\n */\ngoog.events.EventHandler.prototype.handleEvent = function(e) {\n  throw new Error('EventHandler.handleEvent not implemented');\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Provides a utility for tracing and debugging WebChannel\n *     requests.\n *\n */\n\n\ngoog.provide('goog.labs.net.webChannel.WebChannelDebug');\n\ngoog.require('goog.json');\ngoog.require('goog.log');\ngoog.requireType('goog.Uri');\ngoog.requireType('goog.net.XmlHttp.ReadyState');\n\n\n\n/**\n * Logs and keeps a buffer of debugging info for the Channel.\n *\n * @constructor\n * @struct\n * @final\n */\ngoog.labs.net.webChannel.WebChannelDebug = function() {\n  /**\n   * The logger instance.\n   * @const\n   * @private {?goog.log.Logger}\n   */\n  this.logger_ = goog.log.getLogger('goog.labs.net.webChannel.WebChannelDebug');\n\n  /**\n   * Whether to enable redact. Defaults to true.\n   * @private {boolean}\n   */\n  this.redactEnabled_ = true;\n};\n\n\ngoog.scope(function() {\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\n\n\n/**\n * Turns off redact.\n */\nWebChannelDebug.prototype.disableRedact = function() {\n  this.redactEnabled_ = false;\n};\n\n\n/**\n * Logs that the browser went offline during the lifetime of a request.\n * @param {goog.Uri} url The URL being requested.\n */\nWebChannelDebug.prototype.browserOfflineResponse = function(url) {\n  this.info(function() {\n    return 'BROWSER_OFFLINE: ' + url;\n  });\n};\n\n\n/**\n * Logs an XmlHttp request..\n * @param {string} verb The request type (GET/POST).\n * @param {goog.Uri} uri The request destination.\n * @param {string|number|undefined} id The request id.\n * @param {number} attempt Which attempt # the request was.\n * @param {?string} postData The data posted in the request.\n */\nWebChannelDebug.prototype.xmlHttpChannelRequest = function(\n    verb, uri, id, attempt, postData) {\n  var self = this;\n  this.info(function() {\n    return 'XMLHTTP REQ (' + id + ') [attempt ' + attempt + ']: ' + verb +\n        '\\n' + uri + '\\n' + self.maybeRedactPostData_(postData);\n  });\n};\n\n\n/**\n * Logs the meta data received from an XmlHttp request.\n * @param {string} verb The request type (GET/POST).\n * @param {goog.Uri} uri The request destination.\n * @param {string|number|undefined} id The request id.\n * @param {number} attempt Which attempt # the request was.\n * @param {goog.net.XmlHttp.ReadyState} readyState The ready state.\n * @param {number} statusCode The HTTP status code.\n */\nWebChannelDebug.prototype.xmlHttpChannelResponseMetaData = function(\n    verb, uri, id, attempt, readyState, statusCode) {\n  this.info(function() {\n    return 'XMLHTTP RESP (' + id + ') [ attempt ' + attempt + ']: ' + verb +\n        '\\n' + uri + '\\n' + readyState + ' ' + statusCode;\n  });\n};\n\n\n/**\n * Logs the response data received from an XmlHttp request.\n * @param {string|number|undefined} id The request id.\n * @param {?string} responseText The response text.\n * @param {?string=} opt_desc Optional request description.\n */\nWebChannelDebug.prototype.xmlHttpChannelResponseText = function(\n    id, responseText, opt_desc) {\n  var self = this;\n  this.info(function() {\n    return 'XMLHTTP TEXT (' + id + '): ' + self.redactResponse_(responseText) +\n        (opt_desc ? ' ' + opt_desc : '');\n  });\n};\n\n\n/**\n * Logs a request timeout.\n * @param {goog.Uri} uri The uri that timed out.\n */\nWebChannelDebug.prototype.timeoutResponse = function(uri) {\n  this.info(function() {\n    return 'TIMEOUT: ' + uri;\n  });\n};\n\n\n/**\n * Logs a debug message.\n * @param {!goog.debug.Loggable} text The message.\n */\nWebChannelDebug.prototype.debug = function(text) {\n  goog.log.fine(this.logger_, text);\n};\n\n\n/**\n * Logs an exception\n * @param {Error} e The error or error event.\n * @param {goog.debug.Loggable=} opt_msg The optional message,\n *     defaults to 'Exception'.\n */\nWebChannelDebug.prototype.dumpException = function(e, opt_msg) {\n  goog.log.error(this.logger_, opt_msg || 'Exception', e);\n};\n\n\n/**\n * Logs an info message.\n * @param {!goog.debug.Loggable} text The message.\n */\nWebChannelDebug.prototype.info = function(text) {\n  goog.log.info(this.logger_, text);\n};\n\n\n/**\n * Logs a warning message.\n * @param {!goog.debug.Loggable} text The message.\n */\nWebChannelDebug.prototype.warning = function(text) {\n  goog.log.warning(this.logger_, text);\n};\n\n\n/**\n * Logs a severe message.\n * @param {!goog.debug.Loggable} text The message.\n */\nWebChannelDebug.prototype.severe = function(text) {\n  goog.log.error(this.logger_, text);\n};\n\n\n/**\n * Removes potentially private data from a response so that we don't\n * accidentally save private and personal data to the server logs.\n * @param {?string} responseText A JSON response to clean.\n * @return {?string} The cleaned response.\n * @private\n */\nWebChannelDebug.prototype.redactResponse_ = function(responseText) {\n  if (!this.redactEnabled_) {\n    return responseText;\n  }\n\n  if (!responseText) {\n    return null;\n  }\n\n  try {\n    var responseArray = JSON.parse(responseText);\n    if (responseArray) {\n      for (var i = 0; i < responseArray.length; i++) {\n        if (Array.isArray(responseArray[i])) {\n          this.maybeRedactArray_(responseArray[i]);\n        }\n      }\n    }\n\n    return goog.json.serialize(responseArray);\n  } catch (e) {\n    this.debug('Exception parsing expected JS array - probably was not JS');\n    return responseText;\n  }\n};\n\n\n/**\n * Removes data from a response array that may be sensitive.\n * @param {!Array<?>} array The array to clean.\n * @private\n */\nWebChannelDebug.prototype.maybeRedactArray_ = function(array) {\n  if (array.length < 2) {\n    return;\n  }\n  var dataPart = array[1];\n  if (!Array.isArray(dataPart)) {\n    return;\n  }\n  if (dataPart.length < 1) {\n    return;\n  }\n\n  var type = dataPart[0];\n  if (type != 'noop' && type != 'stop' && type != 'close') {\n    // redact all fields in the array\n    for (var i = 1; i < dataPart.length; i++) {\n      dataPart[i] = '';\n    }\n  }\n};\n\n\n/**\n * Removes potentially private data from a request POST body so that we don't\n * accidentally save private and personal data to the server logs.\n * @param {?string} data The data string to clean.\n * @return {?string} The data string with sensitive data replaced by 'redacted'.\n * @private\n */\nWebChannelDebug.prototype.maybeRedactPostData_ = function(data) {\n  if (!this.redactEnabled_) {\n    return data;\n  }\n\n  if (!data) {\n    return null;\n  }\n  var out = '';\n  var params = data.split('&');\n  for (var i = 0; i < params.length; i++) {\n    var param = params[i];\n    var keyValue = param.split('=');\n    if (keyValue.length > 1) {\n      var key = keyValue[0];\n      var value = keyValue[1];\n\n      var keyParts = key.split('_');\n      if (keyParts.length >= 2 && keyParts[1] == 'type') {\n        out += key + '=' + value + '&';\n      } else {\n        out += key + '=' +\n            'redacted' +\n            '&';\n      }\n    }\n  }\n  return out;\n};\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Static utilities for collecting stats associated with\n * ChannelRequest.\n *\n */\n\n\ngoog.provide('goog.labs.net.webChannel.requestStats');\ngoog.provide('goog.labs.net.webChannel.requestStats.Event');\ngoog.provide('goog.labs.net.webChannel.requestStats.ServerReachability');\ngoog.provide('goog.labs.net.webChannel.requestStats.ServerReachabilityEvent');\ngoog.provide('goog.labs.net.webChannel.requestStats.Stat');\ngoog.provide('goog.labs.net.webChannel.requestStats.StatEvent');\ngoog.provide('goog.labs.net.webChannel.requestStats.TimingEvent');\n\ngoog.require('goog.events.Event');\ngoog.require('goog.events.EventTarget');\n\n\ngoog.scope(function() {\nvar requestStats = goog.labs.net.webChannel.requestStats;\n\n\n/**\n * Events fired.\n * @const\n */\nrequestStats.Event = {};\n\n\n/**\n * Singleton event target for firing stat events\n * @type {?goog.events.EventTarget}\n * @private\n */\nrequestStats.eventTarget_ = null;\n\n/**\n * Singleton event target for firing stat events\n * @return {!goog.events.EventTarget}\n * @private\n */\nrequestStats.getStatEventTarget_ = function() {\n  requestStats.eventTarget_ =\n      requestStats.eventTarget_ || new goog.events.EventTarget();\n  return requestStats.eventTarget_;\n};\n\n/**\n * The type of event that occurs every time some information about how reachable\n * the server is is discovered.\n */\nrequestStats.Event.SERVER_REACHABILITY_EVENT = 'serverreachability';\n\n\n/**\n * Types of events which reveal information about the reachability of the\n * server.\n * @enum {number}\n */\nrequestStats.ServerReachability = {\n  REQUEST_MADE: 1,\n  REQUEST_SUCCEEDED: 2,\n  REQUEST_FAILED: 3,\n  BACK_CHANNEL_ACTIVITY: 4  // any response data received\n};\n\n\n\n/**\n * Event class for SERVER_REACHABILITY_EVENT.\n *\n * @param {goog.events.EventTarget} target The stat event target for\n       the channel.\n * @param {requestStats.ServerReachability} reachabilityType\n *     The reachability event type.\n * @constructor\n * @extends {goog.events.Event}\n */\nrequestStats.ServerReachabilityEvent = function(target, reachabilityType) {\n  goog.events.Event.call(\n      this, requestStats.Event.SERVER_REACHABILITY_EVENT, target);\n\n  /**\n   * @type {requestStats.ServerReachability}\n   */\n  this.reachabilityType = reachabilityType;\n};\ngoog.inherits(requestStats.ServerReachabilityEvent, goog.events.Event);\n\n\n/**\n * Notify the channel that a particular fine grained network event has occurred.\n * Should be considered package-private.\n * @param {requestStats.ServerReachability} reachabilityType\n *     The reachability event type.\n */\nrequestStats.notifyServerReachabilityEvent = function(reachabilityType) {\n  var target = requestStats.getStatEventTarget_();\n  target.dispatchEvent(\n      new requestStats.ServerReachabilityEvent(target, reachabilityType));\n};\n\n\n/**\n * Stat Event that fires when things of interest happen that may be useful for\n * applications to know about for stats or debugging purposes.\n */\nrequestStats.Event.STAT_EVENT = 'statevent';\n\n\n/**\n * Enum that identifies events for statistics that are interesting to track.\n * @enum {number}\n */\nrequestStats.Stat = {\n  /** Event indicating a new connection attempt. */\n  CONNECT_ATTEMPT: 0,\n\n  /** Event indicating a connection error due to a general network problem. */\n  ERROR_NETWORK: 1,\n\n  /**\n   * Event indicating a connection error that isn't due to a general network\n   * problem.\n   */\n  ERROR_OTHER: 2,\n\n  /** Event indicating the start of test stage one. */\n  TEST_STAGE_ONE_START: 3,\n\n  /** Event indicating the start of test stage two. */\n  TEST_STAGE_TWO_START: 4,\n\n  /** Event indicating the first piece of test data was received. */\n  TEST_STAGE_TWO_DATA_ONE: 5,\n\n  /**\n   * Event indicating that the second piece of test data was received and it was\n   * received separately from the first.\n   */\n  TEST_STAGE_TWO_DATA_TWO: 6,\n\n  /** Event indicating both pieces of test data were received simultaneously. */\n  TEST_STAGE_TWO_DATA_BOTH: 7,\n\n  /** Event indicating stage one of the test request failed. */\n  TEST_STAGE_ONE_FAILED: 8,\n\n  /** Event indicating stage two of the test request failed. */\n  TEST_STAGE_TWO_FAILED: 9,\n\n  /**\n   * Event indicating that a buffering proxy is likely between the client and\n   * the server.\n   */\n  PROXY: 10,\n\n  /**\n   * Event indicating that no buffering proxy is likely between the client and\n   * the server.\n   */\n  NOPROXY: 11,\n\n  /** Event indicating an unknown SID error. */\n  REQUEST_UNKNOWN_SESSION_ID: 12,\n\n  /** Event indicating a bad status code was received. */\n  REQUEST_BAD_STATUS: 13,\n\n  /** Event indicating incomplete data was received */\n  REQUEST_INCOMPLETE_DATA: 14,\n\n  /** Event indicating bad data was received */\n  REQUEST_BAD_DATA: 15,\n\n  /** Event indicating no data was received when data was expected. */\n  REQUEST_NO_DATA: 16,\n\n  /** Event indicating a request timeout. */\n  REQUEST_TIMEOUT: 17,\n\n  /**\n   * Event indicating that the server never received our hanging GET and so it\n   * is being retried.\n   */\n  BACKCHANNEL_MISSING: 18,\n\n  /**\n   * Event indicating that we have determined that our hanging GET is not\n   * receiving data when it should be. Thus it is dead dead and will be retried.\n   */\n  BACKCHANNEL_DEAD: 19,\n\n  /**\n   * The browser declared itself offline during the lifetime of a request, or\n   * was offline when a request was initially made.\n   */\n  BROWSER_OFFLINE: 20\n};\n\n\n\n/**\n * Event class for STAT_EVENT.\n *\n * @param {goog.events.EventTarget} eventTarget The stat event target for\n       the channel.\n * @param {requestStats.Stat} stat The stat.\n * @constructor\n * @extends {goog.events.Event}\n */\nrequestStats.StatEvent = function(eventTarget, stat) {\n  goog.events.Event.call(this, requestStats.Event.STAT_EVENT, eventTarget);\n\n  /**\n   * The stat\n   * @type {requestStats.Stat}\n   */\n  this.stat = stat;\n\n};\ngoog.inherits(requestStats.StatEvent, goog.events.Event);\n\n\n/**\n * Returns the singleton event target for stat events.\n * @return {!goog.events.EventTarget} The event target for stat events.\n */\nrequestStats.getStatEventTarget = function() {\n  return requestStats.getStatEventTarget_();\n};\n\n\n/**\n * Helper function to call the stat event callback.\n * @param {requestStats.Stat} stat The stat.\n */\nrequestStats.notifyStatEvent = function(stat) {\n  var target = requestStats.getStatEventTarget_();\n  target.dispatchEvent(new requestStats.StatEvent(target, stat));\n};\n\n\n/**\n * An event that fires when POST requests complete successfully, indicating\n * the size of the POST and the round trip time.\n */\nrequestStats.Event.TIMING_EVENT = 'timingevent';\n\n\n\n/**\n * Event class for requestStats.Event.TIMING_EVENT\n *\n * @param {goog.events.EventTarget} target The stat event target for\n       the channel.\n * @param {number} size The number of characters in the POST data.\n * @param {number} rtt The total round trip time from POST to response in MS.\n * @param {number} retries The number of times the POST had to be retried.\n * @constructor\n * @extends {goog.events.Event}\n */\nrequestStats.TimingEvent = function(target, size, rtt, retries) {\n  goog.events.Event.call(this, requestStats.Event.TIMING_EVENT, target);\n\n  /**\n   * @type {number}\n   */\n  this.size = size;\n\n  /**\n   * @type {number}\n   */\n  this.rtt = rtt;\n\n  /**\n   * @type {number}\n   */\n  this.retries = retries;\n\n};\ngoog.inherits(requestStats.TimingEvent, goog.events.Event);\n\n\n/**\n * Helper function to notify listeners about POST request performance.\n *\n * @param {number} size Number of characters in the POST data.\n * @param {number} rtt The amount of time from POST start to response.\n * @param {number} retries The number of times the POST had to be retried.\n */\nrequestStats.notifyTimingEvent = function(size, rtt, retries) {\n  var target = requestStats.getStatEventTarget_();\n  target.dispatchEvent(\n      new requestStats.TimingEvent(target, size, rtt, retries));\n};\n\n\n/**\n * Allows the application to set an execution hooks for when a channel\n * starts processing requests. This is useful to track timing or logging\n * special information. The function takes no parameters and return void.\n * @param {Function} startHook  The function for the start hook.\n */\nrequestStats.setStartThreadExecutionHook = function(startHook) {\n  requestStats.startExecutionHook_ = startHook;\n};\n\n\n/**\n * Allows the application to set an execution hooks for when a channel\n * stops processing requests. This is useful to track timing or logging\n * special information. The function takes no parameters and return void.\n * @param {Function} endHook  The function for the end hook.\n */\nrequestStats.setEndThreadExecutionHook = function(endHook) {\n  requestStats.endExecutionHook_ = endHook;\n};\n\n\n/**\n * Application provided execution hook for the start hook.\n *\n * @type {Function}\n * @private\n */\nrequestStats.startExecutionHook_ = function() {};\n\n\n/**\n * Application provided execution hook for the end hook.\n *\n * @type {Function}\n * @private\n */\nrequestStats.endExecutionHook_ = function() {};\n\n\n/**\n * Helper function to call the start hook\n */\nrequestStats.onStartExecution = function() {\n  requestStats.startExecutionHook_();\n};\n\n\n/**\n * Helper function to call the end hook\n */\nrequestStats.onEndExecution = function() {\n  requestStats.endExecutionHook_();\n};\n\n\n/**\n * Wrapper around SafeTimeout which calls the start and end execution hooks\n * with a try...finally block.\n * @param {Function} fn The callback function.\n * @param {number} ms The time in MS for the timer.\n * @return {number} The ID of the timer.\n */\nrequestStats.setTimeout = function(fn, ms) {\n  if (!goog.isFunction(fn)) {\n    throw new Error('Fn must not be null and must be a function');\n  }\n  return goog.global.setTimeout(function() {\n    requestStats.onStartExecution();\n    try {\n      fn();\n    } finally {\n      requestStats.onEndExecution();\n    }\n  }, ms);\n};\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Error codes shared between goog.net.IframeIo and\n * goog.net.XhrIo.\n */\n\ngoog.provide('goog.net.ErrorCode');\n\n\n/**\n * Error codes\n * @enum {number}\n */\ngoog.net.ErrorCode = {\n\n  /**\n   * There is no error condition.\n   */\n  NO_ERROR: 0,\n\n  /**\n   * The most common error from iframeio, unfortunately, is that the browser\n   * responded with an error page that is classed as a different domain. The\n   * situations, are when a browser error page  is shown -- 404, access denied,\n   * DNS failure, connection reset etc.)\n   *\n   */\n  ACCESS_DENIED: 1,\n\n  /**\n   * Currently the only case where file not found will be caused is when the\n   * code is running on the local file system and a non-IE browser makes a\n   * request to a file that doesn't exist.\n   */\n  FILE_NOT_FOUND: 2,\n\n  /**\n   * If Firefox shows a browser error page, such as a connection reset by\n   * server or access denied, then it will fail silently without the error or\n   * load handlers firing.\n   */\n  FF_SILENT_ERROR: 3,\n\n  /**\n   * Custom error provided by the client through the error check hook.\n   */\n  CUSTOM_ERROR: 4,\n\n  /**\n   * Exception was thrown while processing the request.\n   */\n  EXCEPTION: 5,\n\n  /**\n   * The Http response returned a non-successful http status code.\n   */\n  HTTP_ERROR: 6,\n\n  /**\n   * The request was aborted.\n   */\n  ABORT: 7,\n\n  /**\n   * The request timed out.\n   */\n  TIMEOUT: 8,\n\n  /**\n   * The resource is not available offline.\n   */\n  OFFLINE: 9,\n};\n\n\n/**\n * Returns a friendly error message for an error code. These messages are for\n * debugging and are not localized.\n * @param {goog.net.ErrorCode} errorCode An error code.\n * @return {string} A message for debugging.\n */\ngoog.net.ErrorCode.getDebugMessage = function(errorCode) {\n  switch (errorCode) {\n    case goog.net.ErrorCode.NO_ERROR:\n      return 'No Error';\n\n    case goog.net.ErrorCode.ACCESS_DENIED:\n      return 'Access denied to content document';\n\n    case goog.net.ErrorCode.FILE_NOT_FOUND:\n      return 'File not found';\n\n    case goog.net.ErrorCode.FF_SILENT_ERROR:\n      return 'Firefox silently errored';\n\n    case goog.net.ErrorCode.CUSTOM_ERROR:\n      return 'Application custom error';\n\n    case goog.net.ErrorCode.EXCEPTION:\n      return 'An exception occurred';\n\n    case goog.net.ErrorCode.HTTP_ERROR:\n      return 'Http response at 400 or 500 level';\n\n    case goog.net.ErrorCode.ABORT:\n      return 'Request was aborted';\n\n    case goog.net.ErrorCode.TIMEOUT:\n      return 'Request timed out';\n\n    case goog.net.ErrorCode.OFFLINE:\n      return 'The resource is not available offline';\n\n    default:\n      return 'Unrecognized error code';\n  }\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Common events for the network classes.\n */\n\n\ngoog.provide('goog.net.EventType');\n\n\n/**\n * Event names for network events\n * @enum {string}\n */\ngoog.net.EventType = {\n  COMPLETE: 'complete',\n  SUCCESS: 'success',\n  ERROR: 'error',\n  ABORT: 'abort',\n  READY: 'ready',\n  READY_STATE_CHANGE: 'readystatechange',\n  TIMEOUT: 'timeout',\n  INCREMENTAL_DATA: 'incrementaldata',\n  PROGRESS: 'progress',\n  // DOWNLOAD_PROGRESS and UPLOAD_PROGRESS are special events dispatched by\n  // goog.net.XhrIo to allow binding listeners specific to each type of\n  // progress.\n  DOWNLOAD_PROGRESS: 'downloadprogress',\n  UPLOAD_PROGRESS: 'uploadprogress',\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Interface for a factory for creating XMLHttpRequest objects\n * and metadata about them.\n */\n\ngoog.provide('goog.net.XmlHttpFactory');\n\n/** @suppress {extraRequire} Typedef. */\ngoog.require('goog.net.XhrLike');\n\n\n\n/**\n * Abstract base class for an XmlHttpRequest factory.\n * @constructor\n */\ngoog.net.XmlHttpFactory = function() {};\n\n\n/**\n * Cache of options - we only actually call internalGetOptions once.\n * @type {?Object}\n * @private\n */\ngoog.net.XmlHttpFactory.prototype.cachedOptions_ = null;\n\n\n/**\n * @return {!goog.net.XhrLike.OrNative} A new XhrLike instance.\n */\ngoog.net.XmlHttpFactory.prototype.createInstance = goog.abstractMethod;\n\n\n/**\n * @return {Object} Options describing how xhr objects obtained from this\n *     factory should be used.\n */\ngoog.net.XmlHttpFactory.prototype.getOptions = function() {\n  return this.cachedOptions_ ||\n      (this.cachedOptions_ = this.internalGetOptions());\n};\n\n\n/**\n * Override this method in subclasses to preserve the caching offered by\n * getOptions().\n * @return {Object} Options describing how xhr objects obtained from this\n *     factory should be used.\n * @protected\n */\ngoog.net.XmlHttpFactory.prototype.internalGetOptions = goog.abstractMethod;\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Low level handling of XMLHttpRequest.\n */\n\ngoog.provide('goog.net.DefaultXmlHttpFactory');\ngoog.provide('goog.net.XmlHttp');\ngoog.provide('goog.net.XmlHttp.OptionType');\ngoog.provide('goog.net.XmlHttp.ReadyState');\ngoog.provide('goog.net.XmlHttpDefines');\n\ngoog.require('goog.asserts');\ngoog.require('goog.net.WrapperXmlHttpFactory');\ngoog.require('goog.net.XmlHttpFactory');\n\n\n/**\n * Static class for creating XMLHttpRequest objects.\n * @return {!goog.net.XhrLike.OrNative} A new XMLHttpRequest object.\n */\ngoog.net.XmlHttp = function() {\n  return goog.net.XmlHttp.factory_.createInstance();\n};\n\n\n/**\n * @define {boolean} Whether to assume XMLHttpRequest exists. Setting this to\n *     true bypasses the ActiveX probing code.\n * NOTE(ruilopes): Due to the way JSCompiler works, this define *will not* strip\n * out the ActiveX probing code from binaries.  To achieve this, use\n * `goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR` instead.\n * TODO(ruilopes): Collapse both defines.\n */\ngoog.net.XmlHttp.ASSUME_NATIVE_XHR =\n    goog.define('goog.net.XmlHttp.ASSUME_NATIVE_XHR', false);\n\n\n/** @const */\ngoog.net.XmlHttpDefines = {};\n\n\n/**\n * @define {boolean} Whether to assume XMLHttpRequest exists. Setting this to\n *     true eliminates the ActiveX probing code.\n */\ngoog.net.XmlHttpDefines.ASSUME_NATIVE_XHR =\n    goog.define('goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR', false);\n\n\n/**\n * Gets the options to use with the XMLHttpRequest objects obtained using\n * the static methods.\n * @return {Object} The options.\n */\ngoog.net.XmlHttp.getOptions = function() {\n  return goog.net.XmlHttp.factory_.getOptions();\n};\n\n\n/**\n * Type of options that an XmlHttp object can have.\n * @enum {number}\n */\ngoog.net.XmlHttp.OptionType = {\n  /**\n   * Whether a goog.nullFunction should be used to clear the onreadystatechange\n   * handler instead of null.\n   */\n  USE_NULL_FUNCTION: 0,\n\n  /**\n   * NOTE(user): In IE if send() errors on a *local* request the readystate\n   * is still changed to COMPLETE.  We need to ignore it and allow the\n   * try/catch around send() to pick up the error.\n   */\n  LOCAL_REQUEST_ERROR: 1,\n};\n\n\n/**\n * Status constants for XMLHTTP, matches:\n * https://msdn.microsoft.com/en-us/library/ms534361(v=vs.85).aspx\n * @enum {number}\n */\ngoog.net.XmlHttp.ReadyState = {\n  /**\n   * Constant for when xmlhttprequest.readyState is uninitialized\n   */\n  UNINITIALIZED: 0,\n\n  /**\n   * Constant for when xmlhttprequest.readyState is loading.\n   */\n  LOADING: 1,\n\n  /**\n   * Constant for when xmlhttprequest.readyState is loaded.\n   */\n  LOADED: 2,\n\n  /**\n   * Constant for when xmlhttprequest.readyState is in an interactive state.\n   */\n  INTERACTIVE: 3,\n\n  /**\n   * Constant for when xmlhttprequest.readyState is completed\n   */\n  COMPLETE: 4,\n};\n\n\n/**\n * The global factory instance for creating XMLHttpRequest objects.\n * @type {goog.net.XmlHttpFactory}\n * @private\n */\ngoog.net.XmlHttp.factory_;\n\n\n/**\n * Sets the factories for creating XMLHttpRequest objects and their options.\n * @param {Function} factory The factory for XMLHttpRequest objects.\n * @param {Function} optionsFactory The factory for options.\n * @deprecated Use setGlobalFactory instead.\n */\ngoog.net.XmlHttp.setFactory = function(factory, optionsFactory) {\n  goog.net.XmlHttp.setGlobalFactory(\n      new goog.net.WrapperXmlHttpFactory(\n          goog.asserts.assert(factory), goog.asserts.assert(optionsFactory)));\n};\n\n\n/**\n * Sets the global factory object.\n * @param {!goog.net.XmlHttpFactory} factory New global factory object.\n */\ngoog.net.XmlHttp.setGlobalFactory = function(factory) {\n  goog.net.XmlHttp.factory_ = factory;\n};\n\n\n\n/**\n * Default factory to use when creating xhr objects.  You probably shouldn't be\n * instantiating this directly, but rather using it via goog.net.XmlHttp.\n * @extends {goog.net.XmlHttpFactory}\n * @constructor\n */\ngoog.net.DefaultXmlHttpFactory = function() {\n  goog.net.XmlHttpFactory.call(this);\n};\ngoog.inherits(goog.net.DefaultXmlHttpFactory, goog.net.XmlHttpFactory);\n\n\n/** @override */\ngoog.net.DefaultXmlHttpFactory.prototype.createInstance = function() {\n  var progId = this.getProgId_();\n  if (progId) {\n    return new ActiveXObject(progId);\n  } else {\n    return new XMLHttpRequest();\n  }\n};\n\n\n/** @override */\ngoog.net.DefaultXmlHttpFactory.prototype.internalGetOptions = function() {\n  var progId = this.getProgId_();\n  var options = {};\n  if (progId) {\n    options[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] = true;\n    options[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] = true;\n  }\n  return options;\n};\n\n\n/**\n * The ActiveX PROG ID string to use to create xhr's in IE. Lazily initialized.\n * @type {string|undefined}\n * @private\n */\ngoog.net.DefaultXmlHttpFactory.prototype.ieProgId_;\n\n\n/**\n * Initialize the private state used by other functions.\n * @return {string} The ActiveX PROG ID string to use to create xhr's in IE.\n * @private\n */\ngoog.net.DefaultXmlHttpFactory.prototype.getProgId_ = function() {\n  if (goog.net.XmlHttp.ASSUME_NATIVE_XHR ||\n      goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR) {\n    return '';\n  }\n\n  // The following blog post describes what PROG IDs to use to create the\n  // XMLHTTP object in Internet Explorer:\n  // http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx\n  // However we do not (yet) fully trust that this will be OK for old versions\n  // of IE on Win9x so we therefore keep the last 2.\n  if (!this.ieProgId_ && typeof XMLHttpRequest == 'undefined' &&\n      typeof ActiveXObject != 'undefined') {\n    // Candidate Active X types.\n    var ACTIVE_X_IDENTS = [\n      'MSXML2.XMLHTTP.6.0',\n      'MSXML2.XMLHTTP.3.0',\n      'MSXML2.XMLHTTP',\n      'Microsoft.XMLHTTP',\n    ];\n    for (var i = 0; i < ACTIVE_X_IDENTS.length; i++) {\n      var candidate = ACTIVE_X_IDENTS[i];\n\n      try {\n        new ActiveXObject(candidate);\n        // NOTE(user): cannot assign progid and return candidate in one line\n        // because JSCompiler complaings: BUG 658126\n        this.ieProgId_ = candidate;\n        return candidate;\n      } catch (e) {\n        // do nothing; try next choice\n      }\n    }\n\n    // couldn't find any matches\n    throw new Error(\n        'Could not create ActiveXObject. ActiveX might be disabled,' +\n        ' or MSXML might not be installed');\n  }\n\n  return /** @type {string} */ (this.ieProgId_);\n};\n\n\n// Set the global factory to an instance of the default factory.\ngoog.net.XmlHttp.setGlobalFactory(new goog.net.DefaultXmlHttpFactory());\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview The API spec for the WebChannel messaging library.\n *\n * Similar to HTML5 WebSocket and Closure BrowserChannel, WebChannel\n * offers an abstraction for point-to-point socket-like communication between\n * a browser client and a remote origin.\n *\n * WebChannels are created via <code>WebChannel</code>. Multiple WebChannels\n * may be multiplexed over the same WebChannelTransport, which represents\n * the underlying physical connectivity over standard wire protocols\n * such as HTTP and SPDY.\n *\n * A WebChannels in turn represents a logical communication channel between\n * the client and server end point. A WebChannel remains open for\n * as long as the client or server end-point allows.\n *\n * Messages may be delivered in-order or out-of-order, reliably or unreliably\n * over the same WebChannel. Message delivery guarantees of a WebChannel is\n * to be specified by the application code; and the choice of the\n * underlying wire protocols is completely transparent to the API users.\n *\n * Client-to-client messaging via WebRTC based transport may also be support\n * via the same WebChannel API in future.\n *\n * Note that we have no immediate plan to move this API out of labs. While\n * the implementation is production ready, the API is subject to change\n * (addition only):\n * 1. Adopt new Web APIs (mainly whatwg streams) and goog.net.streams.\n * 2. New programming models for cloud (on the server-side) may require\n *    new APIs to be defined.\n * 3. WebRTC DataChannel alignment\n */\n\ngoog.provide('goog.net.WebChannel');\n\ngoog.require('goog.events');\ngoog.require('goog.events.Event');\ngoog.require('goog.events.Listenable');\ngoog.require('goog.net.XmlHttpFactory');\n\n\n\n/**\n * A WebChannel represents a logical bi-directional channel over which the\n * client communicates with a remote server that holds the other endpoint\n * of the channel. A WebChannel is always created in the context of a shared\n * {@link WebChannelTransport} instance. It is up to the underlying client-side\n * and server-side implementations to decide how or when multiplexing is\n * to be enabled.\n *\n * @interface\n * @extends {EventTarget}\n * @extends {goog.events.Listenable}\n */\ngoog.net.WebChannel = function() {};\n\n\n\n/**\n * This interface defines a pluggable API to allow WebChannel runtime to support\n * customized algorithms in order to recover from transient failures such as\n * those failures caused by network or proxies (intermediaries).\n *\n * The algorithm may also choose to fail-fast, e.g. switch the client to some\n * offline mode.\n *\n * Extra measurements and logging could also be implemented in the custom\n * module, which has the full knowledge of all the state transitions\n * (due to failures).\n *\n * A default algorithm will be provided by the webchannel library itself. Custom\n * algorithms are expected to be tailored to specific client platforms or\n * networking environments, e.g. mobile, cellular network.\n *\n * @interface\n */\ngoog.net.WebChannel.FailureRecovery = function() {};\n\n\n/**\n * Configuration spec for newly created WebChannel instances.\n *\n * WebChannels are configured in the context of the containing\n * {@link WebChannelTransport}. The configuration parameters are specified\n * when a new instance of WebChannel is created via {@link WebChannelTransport}.\n *\n * messageHeaders: custom headers to be added to every message sent to the\n * server. This object is mutable, and custom headers may be changed, removed,\n * or added during the runtime after a channel has been opened.\n *\n * initMessageHeaders: similar to messageHeaders, but any custom headers will\n * be sent only once when the channel is opened. Typical usage is to send\n * an auth header to the server, which only checks the auth header at the time\n * when the channel is opened.\n *\n * messageContentType: sent as initMessageHeaders via X-WebChannel-Content-Type,\n * to inform the server the MIME type of WebChannel messages.\n *\n * messageUrlParams: custom url query parameters to be added to every message\n * sent to the server. This object is mutable, and custom parameters may be\n * changed, removed or added during the runtime after a channel has been opened.\n *\n * clientProtocolHeaderRequired: whether a special header should be added to\n * each message so that the server can dispatch webchannel messages without\n * knowing the URL path prefix. Defaults to false.\n *\n * concurrentRequestLimit: the maximum number of in-flight HTTP requests allowed\n * when SPDY is enabled. Currently we only detect SPDY in Chrome.\n * This parameter defaults to 10. When SPDY is not enabled, this parameter\n * will have no effect.\n *\n * supportsCrossDomainXhr: setting this to true to allow the use of sub-domains\n * (as configured by the server) to send XHRs with the CORS withCredentials\n * bit set to true.\n *\n * sendRawJson: whether to bypass v8 encoding of client-sent messages.\n * This defaults to false now due to legacy servers. New applications should\n * always configure this option to true.\n *\n * httpSessionIdParam: the URL parameter name that contains the session id (\n * for sticky routing of HTTP requests). When this param is specified, a server\n * that supports this option will respond with an opaque session id as part of\n * the initial handshake (via the X-HTTP-Session-Id header); and all the\n * subsequent requests will contain the httpSessionIdParam. This option will\n * take precedence over any duplicated parameter specified with\n * messageUrlParams, whose value will be ignored.\n *\n * httpHeadersOverwriteParam: the URL parameter name to allow custom HTTP\n * headers to be overwritten as a URL param to bypass CORS preflight.\n * goog.net.rpc.HttpCors is used to encode the HTTP headers.\n *\n * forceLongPolling: whether to force long-polling from client to server.\n * This defaults to false. Long-polling may be necessary when a (MITM) proxy\n * is buffering data sent by the server.\n *\n * fastHandshake: enable true 0-RTT message delivery, including\n * leveraging QUIC 0-RTT (which requires GET to be used). This option\n * defaults to false. Note it is allowed to send messages before Open event is\n * received, after a channel has been opened. In order to enable 0-RTT,\n * messages will be encoded as part of URL and therefore there needs be a size\n * limit for those initial messages that are sent immediately as part of the\n * GET handshake request. With sendRawJson=true, this limit is currently set\n * to 4K chars and data beyond this limit will be buffered till the handshake\n * (1-RTT) finishes. With sendRawJson=false, it's up to the application\n * to limit the amount of data that is sent as part of the handshake.\n *\n * disableRedact: whether to disable logging redact. By default, redact is\n * enabled to remove any message payload or user-provided info\n * from closure logs.\n *\n * clientProfile: inform the server about the client profile to enable\n * customized configs that are optimized for certain clients or environments.\n * Currently this information is sent via X-WebChannel-Client-Profile header.\n *\n * internalChannelParams: the internal channel parameter name to allow\n * experimental channel configurations. Supported options include fastfail,\n * baseRetryDelayMs, retryDelaySeedMs, forwardChannelMaxRetries and\n * forwardChannelRequestTimeoutMs. Note that these options are subject to\n * change.\n *\n * xmlHttpFactory: allows the caller to override the factory used to create\n * XMLHttpRequest objects. This is introduced to disable CORS on firefox OS.\n *\n * requestRefreshThresholds: client-side thresholds that decide when to refresh\n * an underlying HTTP request, to limit memory consumption due to XHR buffering\n * or compression context. The client-side thresholds should be signficantly\n * smaller than the server-side thresholds. This allows the client to eliminate\n * any latency introduced by request refreshing, i.e. an RTT window during which\n * messages may be buffered on the server-side. Supported params include\n * totalBytesReceived, totalDurationMs.\n *\n * @typedef {{\n *   messageHeaders: (!Object<string, string>|undefined),\n *   initMessageHeaders: (!Object<string, string>|undefined),\n *   messageContentType: (string|undefined),\n *   messageUrlParams: (!Object<string, string>|undefined),\n *   clientProtocolHeaderRequired: (boolean|undefined),\n *   concurrentRequestLimit: (number|undefined),\n *   supportsCrossDomainXhr: (boolean|undefined),\n *   testUrl: (string|undefined),\n *   sendRawJson: (boolean|undefined),\n *   httpSessionIdParam: (string|undefined),\n *   httpHeadersOverwriteParam: (string|undefined),\n *   backgroundChannelTest: (boolean|undefined),\n *   forceLongPolling: (boolean|undefined),\n *   fastHandshake: (boolean|undefined),\n *   disableRedact: (boolean|undefined),\n *   clientProfile: (string|undefined),\n *   internalChannelParams: (!Object<string, boolean|number>|undefined),\n *   xmlHttpFactory: (!goog.net.XmlHttpFactory|undefined),\n *   requestRefreshThresholds: (!Object<string, number>|undefined),\n * }}\n */\ngoog.net.WebChannel.Options;\n\n\n/**\n * Types that are allowed as message data.\n *\n * Note that JS objects (sent by the client) can only have string encoded\n * values due to the limitation of the current wire protocol.\n *\n * Unicode strings (sent by the server) may or may not need be escaped, as\n * decided by the server.\n *\n * @typedef {(!ArrayBuffer|!Blob|!Object<string, !Object|string>|!Array|string)}\n */\ngoog.net.WebChannel.MessageData;\n\n\n/**\n * Open the WebChannel against the URI specified in the constructor.\n */\ngoog.net.WebChannel.prototype.open = goog.abstractMethod;\n\n\n/**\n * Close the WebChannel.\n *\n * This is a full close (shutdown) with no guarantee of FIFO delivery in respect\n * to any in-flight messages sent to the server.\n *\n * If you need such a guarantee, see the Half the halfClose() method.\n */\ngoog.net.WebChannel.prototype.close = goog.abstractMethod;\n\n\n/**\n * Half-close the WebChannel.\n *\n * Half-close semantics:\n * 1. delivered as a regular message in FIFO programming order\n * 2. the server is expected to return a half-close too (with or without\n *    application involved), which will trigger a full close (shutdown)\n *    on the client side\n * 3. for now, the half-close event defined for server-initiated\n *    half-close is not exposed to the client application\n * 4. a client-side half-close may be triggered internally when the client\n *    receives a half-close from the server; and the client is expected to\n *    do a full close after the half-close is acked and delivered\n *    on the server-side.\n * 5. Full close is always a forced one. See the close() method.\n *\n * New messages sent after halfClose() will be dropped.\n *\n * NOTE: This is not yet implemented, and will throw an exception if called.\n */\ngoog.net.WebChannel.prototype.halfClose = goog.abstractMethod;\n\n\n/**\n * Sends a message to the server that maintains the other end point of\n * the WebChannel.\n *\n * O-RTT behavior:\n * 1. messages sent before open() is called will always be delivered as\n *    part of the handshake, i.e. with 0-RTT\n * 2. messages sent after open() is called but before the OPEN event\n *    is received will be delivered as part of the handshake if\n *    send() is called from the same execution context as open().\n * 3. otherwise, those messages will be buffered till the handshake\n *    is completed (which will fire the OPEN event).\n *\n * @param {!goog.net.WebChannel.MessageData} message The message to send.\n */\ngoog.net.WebChannel.prototype.send = goog.abstractMethod;\n\n\n/**\n * Common events fired by WebChannels.\n * @enum {string}\n */\ngoog.net.WebChannel.EventType = {\n  /** Dispatched when the channel is opened. */\n  OPEN: goog.events.getUniqueId('open'),\n\n  /** Dispatched when the channel is closed. */\n  CLOSE: goog.events.getUniqueId('close'),\n\n  /**\n   * Dispatched when the channel is aborted due to errors.\n   *\n   * For backward compatibility reasons, a CLOSE event will also be\n   * dispatched, following the ERROR event, which indicates that the channel\n   * has been completely shutdown .\n   */\n  ERROR: goog.events.getUniqueId('error'),\n\n  /** Dispatched when the channel has received a new message. */\n  MESSAGE: goog.events.getUniqueId('message')\n};\n\n\n\n/**\n * The event interface for the MESSAGE event.\n *\n * @constructor\n * @extends {goog.events.Event}\n */\ngoog.net.WebChannel.MessageEvent = function() {\n  goog.net.WebChannel.MessageEvent.base(\n      this, 'constructor', goog.net.WebChannel.EventType.MESSAGE);\n};\ngoog.inherits(goog.net.WebChannel.MessageEvent, goog.events.Event);\n\n\n/**\n * The content of the message received from the server.\n *\n * @type {!goog.net.WebChannel.MessageData}\n */\ngoog.net.WebChannel.MessageEvent.prototype.data;\n\n\n/**\n * The metadata key when the MESSAGE event represents a metadata message.\n *\n * @type {string|undefined}\n */\ngoog.net.WebChannel.MessageEvent.prototype.metadataKey;\n\n\n/**\n * WebChannel level error conditions.\n *\n * Summary of error debugging and reporting in WebChannel:\n *\n * Network Error\n * 1. By default the webchannel library will set the error status to\n *    NETWORK_ERROR when a channel has to be aborted or closed. NETWORK_ERROR\n *    may be recovered by the application by retrying and opening a new channel.\n * 2. There may be lost messages (not acked by the server) when a channel is\n *    aborted. Currently we don't have a public API to retrieve messages that\n *    are waiting to be acked on the client side. File a bug if you think it\n *    is useful to expose such an API.\n * 3. Details of why a channel fails are available via closure debug logs,\n *    and stats events (see webchannel/requeststats.js). Those are internal\n *    stats and are subject to change. File a bug if you think it's useful to\n *    version and expose such stats as part of the WebChannel API.\n *\n * Server Error\n * 1. SERVER_ERROR is intended to indicate a non-recoverable condition, e.g.\n *    when auth fails.\n * 2. We don't currently generate any such errors, because most of the time\n *    it's the responsibility of upper-layer frameworks or the application\n *    itself to indicate to the client why a webchannel has been failed\n *    by the server.\n * 3. When a channel is failed by the server explicitly, we still signal\n *    NETWORK_ERROR to the client. Explicit server failure may happen when the\n *    server does a fail-over, or becomes overloaded, or conducts a forced\n *    shutdown etc.\n * 4. We use some heuristic to decide if the network (aka cloud) is down\n *    v.s. the actual server is down.\n *\n *  RuntimeProperties.getLastStatusCode is a useful state that we expose to\n *  the client to indicate the HTTP response status code of the last HTTP\n *  request initiated by the WebChannel client library, for debugging\n *  purposes only.\n *\n *  See WebChannel.Options.backChannelFailureRecovery and\n *  WebChannel.FailureRecovery to install a custom failure-recovery algorithm.\n *\n * @enum {number}\n */\ngoog.net.WebChannel.ErrorStatus = {\n  /** No error has occurred. */\n  OK: 0,\n\n  /** Communication to the server has failed. */\n  NETWORK_ERROR: 1,\n\n  /** The server fails to accept or process the WebChannel. */\n  SERVER_ERROR: 2\n};\n\n\n\n/**\n * The event interface for the ERROR event.\n *\n * @constructor\n * @extends {goog.events.Event}\n */\ngoog.net.WebChannel.ErrorEvent = function() {\n  goog.net.WebChannel.ErrorEvent.base(\n      this, 'constructor', goog.net.WebChannel.EventType.ERROR);\n};\ngoog.inherits(goog.net.WebChannel.ErrorEvent, goog.events.Event);\n\n\n/**\n * The error status.\n *\n * @type {!goog.net.WebChannel.ErrorStatus}\n */\ngoog.net.WebChannel.ErrorEvent.prototype.status;\n\n\n/**\n * @return {!goog.net.WebChannel.RuntimeProperties} The runtime properties\n * of the WebChannel instance.\n */\ngoog.net.WebChannel.prototype.getRuntimeProperties = goog.abstractMethod;\n\n\n\n/**\n * The runtime properties of the WebChannel instance.\n *\n * This class is defined for debugging and monitoring purposes, as well as for\n * runtime functions that the application may choose to manage by itself.\n *\n * @interface\n */\ngoog.net.WebChannel.RuntimeProperties = function() {};\n\n\n/**\n * @return {number} The effective limit for the number of concurrent HTTP\n * requests that are allowed to be made for sending messages from the client\n * to the server. When SPDY is not enabled, this limit will be one.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.getConcurrentRequestLimit =\n    goog.abstractMethod;\n\n\n/**\n * For applications that need support multiple channels (e.g. from\n * different tabs) to the same origin, use this method to decide if SPDY is\n * enabled and therefore it is safe to open multiple channels.\n *\n * If SPDY is disabled, the application may choose to limit the number of active\n * channels to one or use other means such as sub-domains to work around\n * the browser connection limit.\n *\n * @return {boolean} Whether SPDY is enabled for the origin against which\n * the channel is created.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.isSpdyEnabled =\n    goog.abstractMethod;\n\n\n/**\n * @return {number} The number of requests (for sending messages to the server)\n * that are pending. If this number is approaching the value of\n * getConcurrentRequestLimit(), client-to-server message delivery may experience\n * a higher latency.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.getPendingRequestCount =\n    goog.abstractMethod;\n\n\n/**\n * For applications to query the current HTTP session id, sent by the server\n * during the initial handshake.\n *\n * @return {?string} the HTTP session id or null if no HTTP session is in use.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.getHttpSessionId =\n    goog.abstractMethod;\n\n\n/**\n * Experimental API.\n *\n * This method generates an in-band commit request to the server, which will\n * ack the commit request as soon as all messages sent prior to this commit\n * request have been committed by the application.\n *\n * Committing a message has a stronger semantics than delivering a message\n * to the application. Detail spec:\n * https://github.com/bidiweb/webchannel/blob/master/commit.md\n *\n * Timeout or cancellation is not supported and the application is expected to\n * abort the channel if the commit-ack fails to arrive in time.\n *\n * ===\n *\n * This is currently implemented only in the client layer and the commit\n * callback will be invoked after all the pending client-sent messages have been\n * delivered by the server-side webchannel end-point. This semantics is\n * different and weaker than what's required for end-to-end ack which requires\n * the server application to ack the in-order delivery of messages that are sent\n * before the commit request is issued.\n *\n * Commit should only be called after the channel open event is received.\n * Duplicated commits are allowed and only the last callback is guaranteed.\n * Commit called after the channel has been closed will be ignored.\n *\n * @param {function()} callback The callback will be invoked once an\n * ack has been received for the current commit or any newly issued commit.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.commit = goog.abstractMethod;\n\n\n/**\n * This method may be used by the application to recover from a peer failure\n * or to enable sender-initiated flow-control.\n *\n * Detail spec: https://github.com/bidiweb/webchannel/blob/master/commit.md\n *\n * This is not yet implemented.\n *\n * @return {number} The total number of messages that have not received\n * commit-ack from the server; or if no commit has been issued, the number\n * of messages that have not been delivered to the server application.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.getNonAckedMessageCount =\n    goog.abstractMethod;\n\n\n/**\n * A low water-mark message count to notify the application when the\n * flow-control condition is cleared, that is, when the application is\n * able to send more messages.\n *\n * We expect the application to configure a high water-mark message count,\n * which is checked via getNonAckedMessageCount(). When the high water-mark\n * is exceeded, the application should install a callback via this method\n * to be notified when to start to send new messages.\n *\n * This is not yet implemented.\n *\n * @param {number} count The low water-mark count. It is an error to pass\n * a non-positive value.\n * @param {function()} callback The call back to notify the application\n * when NonAckedMessageCount is below the specified low water-mark count.\n * Any previously registered callback is cleared. This new callback will\n * be cleared once it has been fired, or when the channel is closed or aborted.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.notifyNonAckedMessageCount =\n    goog.abstractMethod;\n\n\n/**\n * Experimental API.\n *\n * This method registers a callback to handle the commit request sent\n * by the server. Commit protocol spec:\n * https://github.com/bidiweb/webchannel/blob/master/commit.md\n *\n * This is not yet implemented.\n *\n * @param {function(!Object)} callback The callback will take an opaque\n * commitId which needs be passed back to the server when an ack-commit\n * response is generated by the client application, via ackCommit().\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.onCommit = goog.abstractMethod;\n\n\n/**\n * Experimental API.\n *\n * This method is used by the application to generate an ack-commit response\n * for the given commitId. Commit protocol spec:\n * https://github.com/bidiweb/webchannel/blob/master/commit.md\n *\n * This is not yet implemented.\n *\n * @param {!Object} commitId The commitId which denotes the commit request\n * from the server that needs be ack'ed.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.ackCommit = goog.abstractMethod;\n\n\n/**\n * @return {number} The last HTTP status code received by the channel.\n */\ngoog.net.WebChannel.RuntimeProperties.prototype.getLastStatusCode =\n    goog.abstractMethod;\n\n\n/**\n * Enum to indicate the current recovery state.\n *\n * @enum {string}\n */\ngoog.net.WebChannel.FailureRecovery.State = {\n  /** Initial state. */\n  INIT: 'init',\n\n  /** Once a failure has been detected. */\n  FAILED: 'failed',\n\n  /**\n   * Once a recovery operation has been issued, e.g. a new request to resume\n   * communication.\n   */\n  RECOVERING: 'recovering',\n\n  /** The channel has been closed.  */\n  CLOSED: 'closed'\n};\n\n\n/**\n * Enum to indicate different failure conditions as detected by the webchannel\n * runtime.\n *\n * This enum is to be used only between the runtime and FailureRecovery module,\n * and new states are expected to be introduced in future.\n *\n * @enum {string}\n */\ngoog.net.WebChannel.FailureRecovery.FailureCondition = {\n  /**\n   * The HTTP response returned a non-successful http status code.\n   */\n  HTTP_ERROR: 'http_error',\n\n  /**\n   * The request was aborted.\n   */\n  ABORT: 'abort',\n\n  /**\n   * The request timed out.\n   */\n  TIMEOUT: 'timeout',\n\n  /**\n   * Exception was thrown while processing the request/response.\n   */\n  EXCEPTION: 'exception'\n};\n\n\n/**\n * @return {!goog.net.WebChannel.FailureRecovery.State} the current state,\n * mainly for debugging use.\n */\ngoog.net.WebChannel.FailureRecovery.prototype.getState = goog.abstractMethod;\n\n\n/**\n * This method is for WebChannel runtime to set the current failure condition\n * and to provide a callback for the algorithm to signal to the runtime\n * when it is time to issue a recovery operation, e.g. a new request to the\n * server.\n *\n * Supported transitions include:\n *   INIT->FAILED\n *   FAILED->FAILED (re-entry ok)\n *   RECOVERY->FAILED.\n *\n * Ignored if state == CLOSED.\n *\n * Advanced implementations are expected to track all the state transitions\n * and their timestamps for monitoring purposes.\n *\n * @param {!goog.net.WebChannel.FailureRecovery.FailureCondition} failure The\n * new failure condition generated by the WebChannel runtime.\n * @param {!Function} operation The callback function to the WebChannel\n * runtime to issue a recovery operation, e.g. a new request. E.g. the default\n * recovery algorithm will issue timeout-based recovery operations.\n * Post-condition for the callback: state transition to RECOVERING.\n *\n * @return {!goog.net.WebChannel.FailureRecovery.State} The updated state\n * as decided by the failure recovery module. Upon a recoverable failure event,\n * the state is transitioned to RECOVERING; or the state is transitioned to\n * FAILED which indicates a fail-fast decision for the runtime to execute.\n */\ngoog.net.WebChannel.FailureRecovery.prototype.setFailure = goog.abstractMethod;\n\n\n/**\n * The Webchannel runtime needs call this method when webchannel is closed or\n * aborted.\n *\n * Once the instance is closed, any access to the instance will be a no-op.\n */\ngoog.net.WebChannel.FailureRecovery.prototype.close = goog.abstractMethod;\n\n\n/**\n * A request header to indicate to the server the messaging protocol\n * each HTTP message is speaking.\n *\n * @type {string}\n */\ngoog.net.WebChannel.X_CLIENT_PROTOCOL = 'X-Client-Protocol';\n\n\n/**\n * The value for x-client-protocol when the messaging protocol is WebChannel.\n *\n * @type {string}\n */\ngoog.net.WebChannel.X_CLIENT_PROTOCOL_WEB_CHANNEL = 'webchannel';\n\n\n/**\n * A response header for the server to signal the wire-protocol that\n * the browser establishes with the server (or proxy), e.g. \"spdy\" (aka http/2)\n * \"quic\". This information avoids the need to use private APIs to decide if\n * HTTP requests are multiplexed etc.\n *\n * @type {string}\n */\ngoog.net.WebChannel.X_CLIENT_WIRE_PROTOCOL = 'X-Client-Wire-Protocol';\n\n\n/**\n * A response header for the server to send back the HTTP session id as part of\n * the initial handshake. The value of the HTTP session id is opaque to the\n * WebChannel protocol.\n *\n * @type {string}\n */\ngoog.net.WebChannel.X_HTTP_SESSION_ID = 'X-HTTP-Session-Id';\n\n\n/**\n * A response header for the server to send back any initial response data as a\n * header to avoid any possible buffering by an intermediary, which may\n * be undesired during the handshake.\n *\n * @type {string}\n */\ngoog.net.WebChannel.X_HTTP_INITIAL_RESPONSE = 'X-HTTP-Initial-Response';\n\n\n/**\n * A request header for specifying the content-type of WebChannel messages,\n * e.g. application-defined JSON encoding styles. Currently this header\n * is sent by the client via initMessageHeaders when the channel is opened.\n *\n * @type {string}\n */\ngoog.net.WebChannel.X_WEBCHANNEL_CONTENT_TYPE = 'X-WebChannel-Content-Type';\n\n\n/**\n * A request header for specifying the client profile in order to apply\n * customized config params on the server side, e.g. timeouts.\n *\n * @type {string}\n */\ngoog.net.WebChannel.X_WEBCHANNEL_CLIENT_PROFILE = 'X-WebChannel-Client-Profile';\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Definition of the ChannelRequest class. The request\n * object encapsulates the logic for making a single request, either for the\n * forward channel, back channel, or test channel, to the server. It contains\n * the logic for the two types of transports we use:\n * XMLHTTP and Image request. It provides timeout detection. More transports\n * to be added in future, such as Fetch, WebSocket.\n *\n */\n\n\ngoog.provide('goog.labs.net.webChannel.ChannelRequest');\n\ngoog.require('goog.Timer');\ngoog.require('goog.async.Throttle');\ngoog.require('goog.events.EventHandler');\ngoog.require('goog.labs.net.webChannel.Channel');\ngoog.require('goog.labs.net.webChannel.WebChannelDebug');\ngoog.require('goog.labs.net.webChannel.environment');\ngoog.require('goog.labs.net.webChannel.requestStats');\ngoog.require('goog.net.ErrorCode');\ngoog.require('goog.net.EventType');\ngoog.require('goog.net.WebChannel');\ngoog.require('goog.net.XmlHttp');\ngoog.require('goog.object');\ngoog.require('goog.string');\ngoog.require('goog.userAgent');\ngoog.requireType('goog.Uri');\ngoog.requireType('goog.net.XhrIo');\n\n\n\n/**\n * A new ChannelRequest is created for each request to the server.\n *\n * @param {goog.labs.net.webChannel.Channel} channel\n *     The channel that owns this request.\n * @param {goog.labs.net.webChannel.WebChannelDebug} channelDebug A\n *     WebChannelDebug to use for logging.\n * @param {string=} opt_sessionId The session id for the channel.\n * @param {string|number=} opt_requestId The request id for this request.\n * @param {number=} opt_retryId The retry id for this request.\n * @constructor\n * @struct\n * @final\n */\ngoog.labs.net.webChannel.ChannelRequest = function(\n    channel, channelDebug, opt_sessionId, opt_requestId, opt_retryId) {\n  /**\n   * The channel object that owns the request.\n   * @private {goog.labs.net.webChannel.Channel}\n   */\n  this.channel_ = channel;\n\n  /**\n   * The channel debug to use for logging\n   * @private {goog.labs.net.webChannel.WebChannelDebug}\n   */\n  this.channelDebug_ = channelDebug;\n\n  /**\n   * The Session ID for the channel.\n   * @private {string|undefined}\n   */\n  this.sid_ = opt_sessionId;\n\n  /**\n   * The RID (request ID) for the request.\n   * @private {string|number|undefined}\n   */\n  this.rid_ = opt_requestId;\n\n  /**\n   * The attempt number of the current request.\n   * @private {number}\n   */\n  this.retryId_ = opt_retryId || 1;\n\n  /**\n   * An object to keep track of the channel request event listeners.\n   * @private {!goog.events.EventHandler<\n   *     !goog.labs.net.webChannel.ChannelRequest>}\n   */\n  this.eventHandler_ = new goog.events.EventHandler(this);\n\n  /**\n   * The timeout in ms before failing the request.\n   * @private {number}\n   */\n  this.timeout_ = goog.labs.net.webChannel.ChannelRequest.TIMEOUT_MS_;\n\n  /**\n   * A timer for polling responseText in browsers that don't fire\n   * onreadystatechange during incremental loading of responseText.\n   * @private {goog.Timer}\n   */\n  this.pollingTimer_ =\n      new goog.Timer(goog.labs.net.webChannel.environment.getPollingInterval());\n\n  /**\n   * Extra HTTP headers to add to all the requests sent to the server.\n   * @private {?Object}\n   */\n  this.extraHeaders_ = null;\n\n\n  /**\n   * Whether the request was successful. This is only set to true after the\n   * request successfully completes.\n   * @private {boolean}\n   */\n  this.successful_ = false;\n\n\n  /**\n   * The TimerID of the timer used to detect if the request has timed-out.\n   * @type {?number}\n   * @private\n   */\n  this.watchDogTimerId_ = null;\n\n  /**\n   * The time in the future when the request will timeout.\n   * @private {?number}\n   */\n  this.watchDogTimeoutTime_ = null;\n\n  /**\n   * The time the request started.\n   * @private {?number}\n   */\n  this.requestStartTime_ = null;\n\n  /**\n   * The type of request (XMLHTTP, IMG)\n   * @private {?number}\n   */\n  this.type_ = null;\n\n  /**\n   * The base Uri for the request. The includes all the parameters except the\n   * one that indicates the retry number.\n   * @private {?goog.Uri}\n   */\n  this.baseUri_ = null;\n\n  /**\n   * The request Uri that was actually used for the most recent request attempt.\n   * @private {?goog.Uri}\n   */\n  this.requestUri_ = null;\n\n  /**\n   * The post data, if the request is a post.\n   * @private {?string}\n   */\n  this.postData_ = null;\n\n  /**\n   * An array of pending messages that we have either received a non-successful\n   * response for, or no response at all, and which therefore may or may not\n   * have been received by the server.\n   * @private {!Array<goog.labs.net.webChannel.Wire.QueuedMap>}\n   */\n  this.pendingMessages_ = [];\n\n  /**\n   * The XhrLte request if the request is using XMLHTTP\n   * @private {?goog.net.XhrIo}\n   */\n  this.xmlHttp_ = null;\n\n  /**\n   * The position of where the next unprocessed chunk starts in the response\n   * text.\n   * @private {number}\n   */\n  this.xmlHttpChunkStart_ = 0;\n\n  /**\n   * The verb (Get or Post) for the request.\n   * @private {?string}\n   */\n  this.verb_ = null;\n\n  /**\n   * The last error if the request failed.\n   * @private {?goog.labs.net.webChannel.ChannelRequest.Error}\n   */\n  this.lastError_ = null;\n\n  /**\n   * The last status code received.\n   * @private {number}\n   */\n  this.lastStatusCode_ = -1;\n\n  /**\n   * Whether the request has been cancelled due to a call to cancel.\n   * @private {boolean}\n   */\n  this.cancelled_ = false;\n\n  /**\n   * A throttle time in ms for readystatechange events for the backchannel.\n   * Useful for throttling when ready state is INTERACTIVE (partial data).\n   * If set to zero no throttle is used.\n   *\n   * See WebChannelBase.prototype.readyStateChangeThrottleMs_\n   *\n   * @private {number}\n   */\n  this.readyStateChangeThrottleMs_ = 0;\n\n  /**\n   * The throttle for readystatechange events for the current request, or null\n   * if there is none.\n   * @private {?goog.async.Throttle}\n   */\n  this.readyStateChangeThrottle_ = null;\n\n  /**\n   * Whether to the result is expected to be encoded for chunking and thus\n   * requires decoding.\n   * @private {boolean}\n   */\n  this.decodeChunks_ = false;\n\n  /**\n   * Whether to decode x-http-initial-response.\n   * @private {boolean}\n   */\n  this.decodeInitialResponse_ = false;\n\n  /**\n   * Whether x-http-initial-response has been decoded (dispatched).\n   * @private {boolean}\n   */\n  this.initialResponseDecoded_ = false;\n};\n\n\ngoog.scope(function() {\nvar WebChannel = goog.net.WebChannel;\nvar Channel = goog.labs.net.webChannel.Channel;\nvar ChannelRequest = goog.labs.net.webChannel.ChannelRequest;\nvar requestStats = goog.labs.net.webChannel.requestStats;\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\nvar environment = goog.labs.net.webChannel.environment;\n\n\n/**\n * Default timeout in MS for a request. The server must return data within this\n * time limit for the request to not timeout.\n * @private {number}\n */\nChannelRequest.TIMEOUT_MS_ = 45 * 1000;\n\n\n/**\n * Enum for channel requests type\n * @enum {number}\n * @private\n */\nChannelRequest.Type_ = {\n  /**\n   * XMLHTTP requests.\n   */\n  XML_HTTP: 1,\n\n  /**\n   * IMG requests.\n   */\n  CLOSE_REQUEST: 2\n};\n\n\n/**\n * Enum type for identifying an error.\n * @enum {number}\n */\nChannelRequest.Error = {\n  /**\n   * Errors due to a non-200 status code.\n   */\n  STATUS: 0,\n\n  /**\n   * Errors due to no data being returned.\n   */\n  NO_DATA: 1,\n\n  /**\n   * Errors due to a timeout.\n   */\n  TIMEOUT: 2,\n\n  /**\n   * Errors due to the server returning an unknown.\n   */\n  UNKNOWN_SESSION_ID: 3,\n\n  /**\n   * Errors due to bad data being received.\n   */\n  BAD_DATA: 4,\n\n  /**\n   * Errors due to the handler throwing an exception.\n   */\n  HANDLER_EXCEPTION: 5,\n\n  /**\n   * The browser declared itself offline during the request.\n   */\n  BROWSER_OFFLINE: 6\n};\n\n\n/**\n * Returns a useful error string for debugging based on the specified error\n * code.\n * @param {?ChannelRequest.Error} errorCode The error code.\n * @param {number} statusCode The HTTP status code.\n * @return {string} The error string for the given code combination.\n */\nChannelRequest.errorStringFromCode = function(errorCode, statusCode) {\n  switch (errorCode) {\n    case ChannelRequest.Error.STATUS:\n      return 'Non-200 return code (' + statusCode + ')';\n    case ChannelRequest.Error.NO_DATA:\n      return 'XMLHTTP failure (no data)';\n    case ChannelRequest.Error.TIMEOUT:\n      return 'HttpConnection timeout';\n    default:\n      return 'Unknown error';\n  }\n};\n\n\n/**\n * Sentinel value used to indicate an invalid chunk in a multi-chunk response.\n * @private {Object}\n */\nChannelRequest.INVALID_CHUNK_ = {};\n\n\n/**\n * Sentinel value used to indicate an incomplete chunk in a multi-chunk\n * response.\n * @private {Object}\n */\nChannelRequest.INCOMPLETE_CHUNK_ = {};\n\n\n/**\n * Returns whether XHR streaming is supported on this browser.\n *\n * @return {boolean} Whether XHR streaming is supported.\n * @see http://code.google.com/p/closure-library/issues/detail?id=346\n */\nChannelRequest.supportsXhrStreaming = function() {\n  return !goog.userAgent.IE || goog.userAgent.isDocumentModeOrHigher(10);\n};\n\n\n/**\n * Sets extra HTTP headers to add to all the requests sent to the server.\n *\n * @param {Object} extraHeaders The HTTP headers.\n */\nChannelRequest.prototype.setExtraHeaders = function(extraHeaders) {\n  this.extraHeaders_ = extraHeaders;\n};\n\n\n/**\n * Overrides the default HTTP method.\n *\n * @param {string} verb The HTTP method\n */\nChannelRequest.prototype.setVerb = function(verb) {\n  this.verb_ = verb;\n};\n\n\n/**\n * Sets the timeout for a request\n *\n * @param {number} timeout   The timeout in MS for when we fail the request.\n */\nChannelRequest.prototype.setTimeout = function(timeout) {\n  this.timeout_ = timeout;\n};\n\n\n/**\n * Sets the throttle for handling onreadystatechange events for the request.\n *\n * @param {number} throttle The throttle in ms.  A value of zero indicates\n *     no throttle.\n */\nChannelRequest.prototype.setReadyStateChangeThrottle = function(throttle) {\n  this.readyStateChangeThrottleMs_ = throttle;\n};\n\n\n/**\n * Sets the pending messages that this request is handling.\n *\n * @param {!Array<goog.labs.net.webChannel.Wire.QueuedMap>} pendingMessages\n *     The pending messages for this request.\n */\nChannelRequest.prototype.setPendingMessages = function(pendingMessages) {\n  this.pendingMessages_ = pendingMessages;\n};\n\n\n/**\n * Gets the pending messages that this request is handling, in case of a retry.\n *\n * @return {!Array<goog.labs.net.webChannel.Wire.QueuedMap>} The pending\n *     messages for this request.\n */\nChannelRequest.prototype.getPendingMessages = function() {\n  return this.pendingMessages_;\n};\n\n\n/**\n * Uses XMLHTTP to send an HTTP POST to the server.\n *\n * @param {goog.Uri} uri  The uri of the request.\n * @param {?string} postData  The data for the post body.\n * @param {boolean} decodeChunks  Whether to the result is expected to be\n *     encoded for chunking and thus requires decoding.\n */\nChannelRequest.prototype.xmlHttpPost = function(uri, postData, decodeChunks) {\n  this.type_ = ChannelRequest.Type_.XML_HTTP;\n  this.baseUri_ = uri.clone().makeUnique();\n  this.postData_ = postData;\n  this.decodeChunks_ = decodeChunks;\n  this.sendXmlHttp_(null /* hostPrefix */);\n};\n\n\n/**\n * Uses XMLHTTP to send an HTTP GET to the server.\n *\n * @param {goog.Uri} uri  The uri of the request.\n * @param {boolean} decodeChunks  Whether to the result is expected to be\n *     encoded for chunking and thus requires decoding.\n * @param {?string} hostPrefix  The host prefix, if we might be using a\n *     secondary domain.  Note that it should also be in the URL, adding this\n *     won't cause it to be added to the URL.\n */\nChannelRequest.prototype.xmlHttpGet = function(uri, decodeChunks, hostPrefix) {\n  this.type_ = ChannelRequest.Type_.XML_HTTP;\n  this.baseUri_ = uri.clone().makeUnique();\n  this.postData_ = null;\n  this.decodeChunks_ = decodeChunks;\n\n  this.sendXmlHttp_(hostPrefix);\n};\n\n\n/**\n * Sends a request via XMLHTTP according to the current state of the request\n * object.\n *\n * @param {?string} hostPrefix The host prefix, if we might be using a secondary\n *     domain.\n * @private\n */\nChannelRequest.prototype.sendXmlHttp_ = function(hostPrefix) {\n  this.requestStartTime_ = goog.now();\n  this.ensureWatchDogTimer_();\n\n  // clone the base URI to create the request URI. The request uri has the\n  // attempt number as a parameter which helps in debugging.\n  this.requestUri_ = this.baseUri_.clone();\n  this.requestUri_.setParameterValues('t', this.retryId_);\n\n  // send the request either as a POST or GET\n  this.xmlHttpChunkStart_ = 0;\n  var useSecondaryDomains = this.channel_.shouldUseSecondaryDomains();\n  this.xmlHttp_ =\n      this.channel_.createXhrIo(useSecondaryDomains ? hostPrefix : null);\n\n  if (this.readyStateChangeThrottleMs_ > 0) {\n    this.readyStateChangeThrottle_ = new goog.async.Throttle(\n        goog.bind(this.xmlHttpHandler_, this, this.xmlHttp_),\n        this.readyStateChangeThrottleMs_);\n  }\n\n  this.eventHandler_.listen(\n      this.xmlHttp_, goog.net.EventType.READY_STATE_CHANGE,\n      this.readyStateChangeHandler_);\n\n  var headers = this.extraHeaders_ ? goog.object.clone(this.extraHeaders_) : {};\n  if (this.postData_) {\n    if (!this.verb_) {\n      this.verb_ = 'POST';\n    }\n    headers['Content-Type'] = 'application/x-www-form-urlencoded';\n    this.xmlHttp_.send(this.requestUri_, this.verb_, this.postData_, headers);\n  } else {\n    this.verb_ = 'GET';\n    this.xmlHttp_.send(this.requestUri_, this.verb_, null, headers);\n  }\n  requestStats.notifyServerReachabilityEvent(\n      requestStats.ServerReachability.REQUEST_MADE);\n  this.channelDebug_.xmlHttpChannelRequest(\n      this.verb_, this.requestUri_, this.rid_, this.retryId_, this.postData_);\n};\n\n\n/**\n * Handles a readystatechange event.\n * @param {goog.events.Event} evt The event.\n * @private\n */\nChannelRequest.prototype.readyStateChangeHandler_ = function(evt) {\n  var xhr = /** @type {goog.net.XhrIo} */ (evt.target);\n  var throttle = this.readyStateChangeThrottle_;\n  if (throttle &&\n      xhr.getReadyState() == goog.net.XmlHttp.ReadyState.INTERACTIVE) {\n    // Only throttle in the partial data case.\n    this.channelDebug_.debug('Throttling readystatechange.');\n    throttle.fire();\n  } else {\n    // If we haven't throttled, just handle response directly.\n    this.xmlHttpHandler_(xhr);\n  }\n};\n\n\n/**\n * XmlHttp handler\n * @param {goog.net.XhrIo} xmlhttp The XhrIo object for the current request.\n * @private\n */\nChannelRequest.prototype.xmlHttpHandler_ = function(xmlhttp) {\n  requestStats.onStartExecution();\n\n\n  try {\n    if (xmlhttp == this.xmlHttp_) {\n      this.onXmlHttpReadyStateChanged_();\n    } else {\n      this.channelDebug_.warning(\n          'Called back with an ' +\n          'unexpected xmlhttp');\n    }\n  } catch (ex) {\n    this.channelDebug_.debug('Failed call to OnXmlHttpReadyStateChanged_');\n    if (this.xmlHttp_ && this.xmlHttp_.getResponseText()) {\n      var channelRequest = this;\n      this.channelDebug_.dumpException(ex, function() {\n        return 'ResponseText: ' + channelRequest.xmlHttp_.getResponseText();\n      });\n    } else {\n      this.channelDebug_.dumpException(ex, 'No response text');\n    }\n  } finally {\n    requestStats.onEndExecution();\n  }\n};\n\n\n/**\n * Called by the readystate handler for XMLHTTP requests.\n *\n * @private\n */\nChannelRequest.prototype.onXmlHttpReadyStateChanged_ = function() {\n  var readyState = this.xmlHttp_.getReadyState();\n  var errorCode = this.xmlHttp_.getLastErrorCode();\n  var statusCode = this.xmlHttp_.getStatus();\n\n  // we get partial results in browsers that support ready state interactive.\n  // We also make sure that getResponseText is not null in interactive mode\n  // before we continue.\n  if (readyState < goog.net.XmlHttp.ReadyState.INTERACTIVE ||\n      (readyState == goog.net.XmlHttp.ReadyState.INTERACTIVE &&\n       !environment.isPollingRequired() &&  // otherwise, go on to startPolling\n       !this.xmlHttp_.getResponseText())) {\n    return;  // not yet ready\n  }\n\n  // Dispatch any appropriate network events.\n  if (!this.cancelled_ && readyState == goog.net.XmlHttp.ReadyState.COMPLETE &&\n      errorCode != goog.net.ErrorCode.ABORT) {\n    // Pretty conservative, these are the only known scenarios which we'd\n    // consider indicative of a truly non-functional network connection.\n    if (errorCode == goog.net.ErrorCode.TIMEOUT || statusCode <= 0) {\n      requestStats.notifyServerReachabilityEvent(\n          requestStats.ServerReachability.REQUEST_FAILED);\n    } else {\n      requestStats.notifyServerReachabilityEvent(\n          requestStats.ServerReachability.REQUEST_SUCCEEDED);\n    }\n  }\n\n  // got some data so cancel the watchdog timer\n  this.cancelWatchDogTimer_();\n\n  var status = this.xmlHttp_.getStatus();\n  this.lastStatusCode_ = status;\n  var responseText = this.xmlHttp_.getResponseText();\n  if (!responseText) {\n    var channelRequest = this;\n    this.channelDebug_.debug(function() {\n      return 'No response text for uri ' + channelRequest.requestUri_ +\n          ' status ' + status;\n    });\n  }\n  this.successful_ = (status == 200);\n\n  this.channelDebug_.xmlHttpChannelResponseMetaData(\n      /** @type {string} */ (this.verb_), this.requestUri_, this.rid_,\n      this.retryId_, readyState, status);\n\n  if (!this.successful_) {\n    if (status == 400 && responseText.indexOf('Unknown SID') > 0) {\n      // the server error string will include 'Unknown SID' which indicates the\n      // server doesn't know about the session (maybe it got restarted, maybe\n      // the user got moved to another server, etc.,). Handlers can special\n      // case this error\n      this.lastError_ = ChannelRequest.Error.UNKNOWN_SESSION_ID;\n      requestStats.notifyStatEvent(\n          requestStats.Stat.REQUEST_UNKNOWN_SESSION_ID);\n      this.channelDebug_.warning('XMLHTTP Unknown SID (' + this.rid_ + ')');\n    } else {\n      this.lastError_ = ChannelRequest.Error.STATUS;\n      requestStats.notifyStatEvent(requestStats.Stat.REQUEST_BAD_STATUS);\n      this.channelDebug_.warning(\n          'XMLHTTP Bad status ' + status + ' (' + this.rid_ + ')');\n    }\n    this.cleanup_();\n    this.dispatchFailure_();\n    return;\n  }\n\n  if (this.shouldCheckInitialResponse_()) {\n    var initialResponse = this.getInitialResponse_();\n    if (initialResponse) {\n      this.channelDebug_.xmlHttpChannelResponseText(\n          this.rid_, initialResponse,\n          'Initial handshake response via ' +\n              WebChannel.X_HTTP_INITIAL_RESPONSE);\n      this.initialResponseDecoded_ = true;\n      this.safeOnRequestData_(initialResponse);\n    } else {\n      this.successful_ = false;\n      this.lastError_ = ChannelRequest.Error.UNKNOWN_SESSION_ID;  // fail-fast\n      requestStats.notifyStatEvent(\n          requestStats.Stat.REQUEST_UNKNOWN_SESSION_ID);\n      this.channelDebug_.warning(\n          'XMLHTTP Missing X_HTTP_INITIAL_RESPONSE' +\n          ' (' + this.rid_ + ')');\n      this.cleanup_();\n      this.dispatchFailure_();\n      return;\n    }\n  }\n\n  if (this.decodeChunks_) {\n    this.decodeNextChunks_(readyState, responseText);\n    if (environment.isPollingRequired() && this.successful_ &&\n        readyState == goog.net.XmlHttp.ReadyState.INTERACTIVE) {\n      this.startPolling_();\n    }\n  } else {\n    this.channelDebug_.xmlHttpChannelResponseText(\n        this.rid_, responseText, null);\n    this.safeOnRequestData_(responseText);\n  }\n\n  if (readyState == goog.net.XmlHttp.ReadyState.COMPLETE) {\n    this.cleanup_();\n  }\n\n  if (!this.successful_) {\n    return;\n  }\n\n  if (!this.cancelled_) {\n    if (readyState == goog.net.XmlHttp.ReadyState.COMPLETE) {\n      this.channel_.onRequestComplete(this);\n    } else {\n      // The default is false, the result from this callback shouldn't carry\n      // over to the next callback, otherwise the request looks successful if\n      // the watchdog timer gets called\n      this.successful_ = false;\n      this.ensureWatchDogTimer_();\n    }\n  }\n};\n\n\n/**\n * Whether we need check the initial-response header that is sent during the\n * fast handshake.\n *\n * @return {boolean} true if the initial-response header is yet to be processed.\n * @private\n */\nChannelRequest.prototype.shouldCheckInitialResponse_ = function() {\n  return this.decodeInitialResponse_ && !this.initialResponseDecoded_;\n};\n\n\n/**\n * Queries the initial response header that is sent during the handshake.\n *\n * @return {?string} The non-empty header value or null.\n * @private\n */\nChannelRequest.prototype.getInitialResponse_ = function() {\n  if (this.xmlHttp_) {\n    var value = this.xmlHttp_.getStreamingResponseHeader(\n        WebChannel.X_HTTP_INITIAL_RESPONSE);\n    if (value && !goog.string.isEmptyOrWhitespace(value)) {\n      return value;\n    }\n  }\n\n  return null;\n};\n\n\n/**\n * Check if the initial response header has been handled.\n *\n * @return {boolean} true if X_HTTP_INITIAL_RESPONSE has been handled.\n */\nChannelRequest.prototype.isInitialResponseDecoded = function() {\n  return this.initialResponseDecoded_;\n};\n\n\n/**\n * Decodes X_HTTP_INITIAL_RESPONSE if present.\n */\nChannelRequest.prototype.setDecodeInitialResponse = function() {\n  this.decodeInitialResponse_ = true;\n};\n\n\n/**\n * Decodes the next set of available chunks in the response.\n * @param {number} readyState The value of readyState.\n * @param {string} responseText The value of responseText.\n * @private\n */\nChannelRequest.prototype.decodeNextChunks_ = function(\n    readyState, responseText) {\n  var decodeNextChunksSuccessful = true;\n  while (!this.cancelled_ && this.xmlHttpChunkStart_ < responseText.length) {\n    var chunkText = this.getNextChunk_(responseText);\n    if (chunkText == ChannelRequest.INCOMPLETE_CHUNK_) {\n      if (readyState == goog.net.XmlHttp.ReadyState.COMPLETE) {\n        // should have consumed entire response when the request is done\n        this.lastError_ = ChannelRequest.Error.BAD_DATA;\n        requestStats.notifyStatEvent(requestStats.Stat.REQUEST_INCOMPLETE_DATA);\n        decodeNextChunksSuccessful = false;\n      }\n      this.channelDebug_.xmlHttpChannelResponseText(\n          this.rid_, null, '[Incomplete Response]');\n      break;\n    } else if (chunkText == ChannelRequest.INVALID_CHUNK_) {\n      this.lastError_ = ChannelRequest.Error.BAD_DATA;\n      requestStats.notifyStatEvent(requestStats.Stat.REQUEST_BAD_DATA);\n      this.channelDebug_.xmlHttpChannelResponseText(\n          this.rid_, responseText, '[Invalid Chunk]');\n      decodeNextChunksSuccessful = false;\n      break;\n    } else {\n      this.channelDebug_.xmlHttpChannelResponseText(\n          this.rid_, /** @type {string} */ (chunkText), null);\n      this.safeOnRequestData_(/** @type {string} */ (chunkText));\n    }\n  }\n  if (readyState == goog.net.XmlHttp.ReadyState.COMPLETE &&\n      responseText.length == 0) {\n    // also an error if we didn't get any response\n    this.lastError_ = ChannelRequest.Error.NO_DATA;\n    requestStats.notifyStatEvent(requestStats.Stat.REQUEST_NO_DATA);\n    decodeNextChunksSuccessful = false;\n  }\n  this.successful_ = this.successful_ && decodeNextChunksSuccessful;\n  if (!decodeNextChunksSuccessful) {\n    // malformed response - we make this trigger retry logic\n    this.channelDebug_.xmlHttpChannelResponseText(\n        this.rid_, responseText, '[Invalid Chunked Response]');\n    this.cleanup_();\n    this.dispatchFailure_();\n  }\n};\n\n\n/**\n * Polls the response for new data.\n * @private\n */\nChannelRequest.prototype.pollResponse_ = function() {\n  if (!this.xmlHttp_) {\n    return;  // already closed\n  }\n  var readyState = this.xmlHttp_.getReadyState();\n  var responseText = this.xmlHttp_.getResponseText();\n  if (this.xmlHttpChunkStart_ < responseText.length) {\n    this.cancelWatchDogTimer_();\n    this.decodeNextChunks_(readyState, responseText);\n    if (this.successful_ &&\n        readyState != goog.net.XmlHttp.ReadyState.COMPLETE) {\n      this.ensureWatchDogTimer_();\n    }\n  }\n};\n\n\n/**\n * Starts a polling interval for changes to responseText of the\n * XMLHttpRequest, for browsers that don't fire onreadystatechange\n * as data comes in incrementally.  This timer is disabled in\n * cleanup_().\n * @private\n */\nChannelRequest.prototype.startPolling_ = function() {\n  this.eventHandler_.listen(\n      this.pollingTimer_, goog.Timer.TICK, this.pollResponse_);\n  this.pollingTimer_.start();\n};\n\n\n/**\n * Returns the next chunk of a chunk-encoded response. This is not standard\n * HTTP chunked encoding because browsers don't expose the chunk boundaries to\n * the application through XMLHTTP. So we have an additional chunk encoding at\n * the application level that lets us tell where the beginning and end of\n * individual responses are so that we can only try to eval a complete JS array.\n *\n * The encoding is the size of the chunk encoded as a decimal string followed\n * by a newline followed by the data.\n *\n * @param {string} responseText The response text from the XMLHTTP response.\n * @return {string|Object} The next chunk string or a sentinel object\n *                         indicating a special condition.\n * @private\n */\nChannelRequest.prototype.getNextChunk_ = function(responseText) {\n  var sizeStartIndex = this.xmlHttpChunkStart_;\n  var sizeEndIndex = responseText.indexOf('\\n', sizeStartIndex);\n  if (sizeEndIndex == -1) {\n    return ChannelRequest.INCOMPLETE_CHUNK_;\n  }\n\n  var sizeAsString = responseText.substring(sizeStartIndex, sizeEndIndex);\n  var size = Number(sizeAsString);\n  if (isNaN(size)) {\n    return ChannelRequest.INVALID_CHUNK_;\n  }\n\n  var chunkStartIndex = sizeEndIndex + 1;\n  if (chunkStartIndex + size > responseText.length) {\n    return ChannelRequest.INCOMPLETE_CHUNK_;\n  }\n\n  var chunkText = responseText.substr(chunkStartIndex, size);\n  this.xmlHttpChunkStart_ = chunkStartIndex + size;\n  return chunkText;\n};\n\n\n/**\n * Uses an IMG tag or navigator.sendBeacon to send an HTTP get to the server.\n *\n * This is only currently used to terminate the connection, as an IMG tag is\n * the most reliable way to send something to the server while the page\n * is getting torn down.\n *\n * Navigator.sendBeacon is available on Chrome and Firefox as a formal\n * solution to ensure delivery without blocking window close. See\n * https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon\n *\n * For Chrome Apps, sendBeacon is always necessary due to Content Security\n * Policy (CSP) violation of using an IMG tag.\n *\n * For react-native, we use xhr to send the actual close request, and assume\n * there is no page-close issue with react-native.\n *\n * @param {goog.Uri} uri The uri to send a request to.\n */\nChannelRequest.prototype.sendCloseRequest = function(uri) {\n  this.type_ = ChannelRequest.Type_.CLOSE_REQUEST;\n  this.baseUri_ = uri.clone().makeUnique();\n\n  var requestSent = false;\n\n  if (goog.global.navigator && goog.global.navigator.sendBeacon) {\n    // empty string body to avoid 413 error on chrome < 41\n    requestSent =\n        goog.global.navigator.sendBeacon(this.baseUri_.toString(), '');\n  }\n\n  if (!requestSent && goog.global.Image) {\n    var eltImg = new Image();\n    eltImg.src = this.baseUri_;\n    requestSent = true;\n  }\n\n  if (!requestSent) {\n    // no handler is set to match the sendBeacon/Image behavior\n    this.xmlHttp_ = this.channel_.createXhrIo(null);\n    this.xmlHttp_.send(this.baseUri_);\n  }\n\n  this.requestStartTime_ = goog.now();\n  this.ensureWatchDogTimer_();\n};\n\n\n/**\n * Cancels the request no matter what the underlying transport is.\n */\nChannelRequest.prototype.cancel = function() {\n  this.cancelled_ = true;\n  this.cleanup_();\n};\n\n\n/**\n * Resets the timeout.\n *\n * @param {number=} opt_timeout The new timeout\n */\nChannelRequest.prototype.resetTimeout = function(opt_timeout) {\n  if (opt_timeout) {\n    this.setTimeout(opt_timeout);\n  }\n  // restart only if a timer is currently set\n  if (this.watchDogTimerId_) {\n    this.cancelWatchDogTimer_();\n    this.ensureWatchDogTimer_();\n  }\n};\n\n\n/**\n * Ensures that there is watchdog timeout which is used to ensure that\n * the connection completes in time.\n *\n * @private\n */\nChannelRequest.prototype.ensureWatchDogTimer_ = function() {\n  this.watchDogTimeoutTime_ = goog.now() + this.timeout_;\n  this.startWatchDogTimer_(this.timeout_);\n};\n\n\n/**\n * Starts the watchdog timer which is used to ensure that the connection\n * completes in time.\n * @param {number} time The number of milliseconds to wait.\n * @private\n */\nChannelRequest.prototype.startWatchDogTimer_ = function(time) {\n  if (this.watchDogTimerId_ != null) {\n    // assertion\n    throw new Error('WatchDog timer not null');\n  }\n  this.watchDogTimerId_ =\n      requestStats.setTimeout(goog.bind(this.onWatchDogTimeout_, this), time);\n};\n\n\n/**\n * Cancels the watchdog timer if it has been started.\n *\n * @private\n */\nChannelRequest.prototype.cancelWatchDogTimer_ = function() {\n  if (this.watchDogTimerId_) {\n    goog.global.clearTimeout(this.watchDogTimerId_);\n    this.watchDogTimerId_ = null;\n  }\n};\n\n\n/**\n * Called when the watchdog timer is triggered. It also handles a case where it\n * is called too early which we suspect may be happening sometimes\n * (not sure why)\n *\n * @private\n */\nChannelRequest.prototype.onWatchDogTimeout_ = function() {\n  this.watchDogTimerId_ = null;\n  var now = goog.now();\n  if (now - this.watchDogTimeoutTime_ >= 0) {\n    this.handleTimeout_();\n  } else {\n    // got called too early for some reason\n    this.channelDebug_.warning('WatchDog timer called too early');\n    this.startWatchDogTimer_(this.watchDogTimeoutTime_ - now);\n  }\n};\n\n\n/**\n * Called when the request has actually timed out. Will cleanup and notify the\n * channel of the failure.\n *\n * @private\n */\nChannelRequest.prototype.handleTimeout_ = function() {\n  if (this.successful_) {\n    // Should never happen.\n    this.channelDebug_.severe(\n        'Received watchdog timeout even though request loaded successfully');\n  }\n\n  this.channelDebug_.timeoutResponse(this.requestUri_);\n\n  // IMG or SendBeacon requests never notice if they were successful,\n  // and always 'time out'. This fact says nothing about reachability.\n  if (this.type_ != ChannelRequest.Type_.CLOSE_REQUEST) {\n    requestStats.notifyServerReachabilityEvent(\n        requestStats.ServerReachability.REQUEST_FAILED);\n    requestStats.notifyStatEvent(requestStats.Stat.REQUEST_TIMEOUT);\n  }\n\n  this.cleanup_();\n\n  // Set error and dispatch failure.\n  // This is called for CLOSE_REQUEST too to ensure channel_.onRequestComplete.\n  this.lastError_ = ChannelRequest.Error.TIMEOUT;\n  this.dispatchFailure_();\n};\n\n\n/**\n * Notifies the channel that this request failed.\n * @private\n */\nChannelRequest.prototype.dispatchFailure_ = function() {\n  if (this.channel_.isClosed() || this.cancelled_) {\n    return;\n  }\n\n  this.channel_.onRequestComplete(this);\n};\n\n\n/**\n * Cleans up the objects used to make the request. This function is\n * idempotent.\n *\n * @private\n */\nChannelRequest.prototype.cleanup_ = function() {\n  this.cancelWatchDogTimer_();\n\n  goog.dispose(this.readyStateChangeThrottle_);\n  this.readyStateChangeThrottle_ = null;\n\n  // Stop the polling timer, if necessary.\n  this.pollingTimer_.stop();\n\n  // Unhook all event handlers.\n  this.eventHandler_.removeAll();\n\n  if (this.xmlHttp_) {\n    // clear out this.xmlHttp_ before aborting so we handle getting reentered\n    // inside abort\n    var xmlhttp = this.xmlHttp_;\n    this.xmlHttp_ = null;\n    xmlhttp.abort();\n    xmlhttp.dispose();\n  }\n};\n\n\n/**\n * Indicates whether the request was successful. Only valid after the handler\n * is called to indicate completion of the request.\n *\n * @return {boolean} True if the request succeeded.\n */\nChannelRequest.prototype.getSuccess = function() {\n  return this.successful_;\n};\n\n\n/**\n * If the request was not successful, returns the reason.\n *\n * @return {?ChannelRequest.Error}  The last error.\n */\nChannelRequest.prototype.getLastError = function() {\n  return this.lastError_;\n};\n\n\n/**\n * Returns the status code of the last request.\n * @return {number} The status code of the last request.\n */\nChannelRequest.prototype.getLastStatusCode = function() {\n  return this.lastStatusCode_;\n};\n\n\n/**\n * Returns the session id for this channel.\n *\n * @return {string|undefined} The session ID.\n */\nChannelRequest.prototype.getSessionId = function() {\n  return this.sid_;\n};\n\n\n/**\n * Returns the request id for this request. Each request has a unique request\n * id and the request IDs are a sequential increasing count.\n *\n * @return {string|number|undefined} The request ID.\n */\nChannelRequest.prototype.getRequestId = function() {\n  return this.rid_;\n};\n\n\n/**\n * Returns the data for a post, if this request is a post.\n *\n * @return {?string} The POST data provided by the request initiator.\n */\nChannelRequest.prototype.getPostData = function() {\n  return this.postData_;\n};\n\n\n/**\n * Returns the XhrIo request object.\n *\n * @return {?goog.net.XhrIo} Any XhrIo request created for this object.\n */\nChannelRequest.prototype.getXhr = function() {\n  return this.xmlHttp_;\n};\n\n\n/**\n * Returns the time that the request started, if it has started.\n *\n * @return {?number} The time the request started, as returned by goog.now().\n */\nChannelRequest.prototype.getRequestStartTime = function() {\n  return this.requestStartTime_;\n};\n\n\n/**\n * Helper to call the callback's onRequestData, which catches any\n * exception.\n * @param {string} data The request data.\n * @private\n */\nChannelRequest.prototype.safeOnRequestData_ = function(data) {\n  try {\n    this.channel_.onRequestData(this, data);\n    var stats = requestStats.ServerReachability;\n    requestStats.notifyServerReachabilityEvent(stats.BACK_CHANNEL_ACTIVITY);\n  } catch (e) {\n    // Dump debug info, but keep going without closing the channel.\n    this.channelDebug_.dumpException(e, 'Error in httprequest callback');\n  }\n};\n\n\n/**\n * Convenience factory method.\n *\n * @param {Channel} channel The channel object that owns this request.\n * @param {WebChannelDebug} channelDebug A WebChannelDebug to use for logging.\n * @param {string=} opt_sessionId  The session id for the channel.\n * @param {string|number=} opt_requestId  The request id for this request.\n * @param {number=} opt_retryId  The retry id for this request.\n * @return {!ChannelRequest} The created channel request.\n */\nChannelRequest.createChannelRequest = function(\n    channel, channelDebug, opt_sessionId, opt_requestId, opt_retryId) {\n  return new ChannelRequest(\n      channel, channelDebug, opt_sessionId, opt_requestId, opt_retryId);\n};\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview A single module to define user-agent specific environment\n * details.\n *\n */\n\ngoog.module('goog.labs.net.webChannel.environment');\n\ngoog.module.declareLegacyNamespace();\n\nvar userAgent = goog.require('goog.userAgent');\n\n\n/**\n * The default polling interval in millis for Edge.\n *\n * Currently on edge, new-chunk events may be not be fired (at all) if a new\n * chunk arrives within 50ms following the previous chunk. This may be fixed\n * in future, which requires changes to the whatwg spec too.\n *\n * @private @const {number}\n */\nvar EDGE_POLLING_INTERVAL_ = 125;\n\n\n/**\n * History:\n *\n * IE11 is still using Trident, the traditional engine for IE.\n * Edge is using EdgeHTML, a fork of Trident. We are seeing the same issue\n * on IE-11 (reported in 2017), so treat IE the same as Edge for now.\n *\n * We used to do polling for Opera (only) with an 250ms interval, because Opera\n * only fires readyState == INTERACTIVE once. Opera switched to WebKit in 2013,\n * and then to Blink (chrome).\n *\n * TODO(user): check the raw UA string to keep polling for old, mobile operas\n * that may still be affected. For old Opera, double the polling interval\n * to 250ms.\n *\n * @return {boolean} True if polling is required with XHR.\n */\nexports.isPollingRequired = function() {\n  return userAgent.EDGE_OR_IE;\n};\n\n\n/**\n * How often to poll (in MS) for changes to responseText in browsers that don't\n * fire onreadystatechange during incremental loading of the response body.\n *\n * @return {number|undefined} The polling interval (MS) for the current U-A;\n * or undefined if polling is not supposed to be enabled.\n */\nexports.getPollingInterval = function() {\n  if (userAgent.EDGE_OR_IE) {\n    return EDGE_POLLING_INTERVAL_;\n  }\n\n  return undefined;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Base WebChannel implementation.\n */\n\n\ngoog.provide('goog.labs.net.webChannel.WebChannelBase');\n\ngoog.require('goog.Uri');\ngoog.require('goog.array');\ngoog.require('goog.asserts');\ngoog.require('goog.async.run');\ngoog.require('goog.json');\ngoog.require('goog.labs.net.webChannel.Channel');\ngoog.require('goog.labs.net.webChannel.ChannelRequest');\ngoog.require('goog.labs.net.webChannel.ConnectionState');\ngoog.require('goog.labs.net.webChannel.ForwardChannelRequestPool');\ngoog.require('goog.labs.net.webChannel.WebChannelDebug');\ngoog.require('goog.labs.net.webChannel.Wire');\ngoog.require('goog.labs.net.webChannel.WireV8');\ngoog.require('goog.labs.net.webChannel.netUtils');\ngoog.require('goog.labs.net.webChannel.requestStats');\ngoog.require('goog.net.WebChannel');\ngoog.require('goog.net.XhrIo');\ngoog.require('goog.net.XmlHttpFactory');\ngoog.require('goog.net.rpc.HttpCors');\ngoog.require('goog.object');\ngoog.require('goog.string');\ngoog.require('goog.structs');\n\ngoog.scope(function() {\nvar WebChannel = goog.net.WebChannel;\nvar ChannelRequest = goog.labs.net.webChannel.ChannelRequest;\nvar ConnectionState = goog.labs.net.webChannel.ConnectionState;\nvar ForwardChannelRequestPool =\n    goog.labs.net.webChannel.ForwardChannelRequestPool;\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\nvar Wire = goog.labs.net.webChannel.Wire;\nvar WireV8 = goog.labs.net.webChannel.WireV8;\nvar netUtils = goog.labs.net.webChannel.netUtils;\nvar requestStats = goog.labs.net.webChannel.requestStats;\n\nvar httpCors = goog.module.get('goog.net.rpc.HttpCors');\n\n/**\n * Gets an internal channel parameter in a type-safe way.\n *\n * @param {string} paramName the key of the parameter to fetch.\n * @param {!T} defaultValue the default value to return\n * @param {!goog.net.WebChannel.Options=} options Configuration for the\n *        WebChannel instance.\n * @return {T}\n * @template T\n */\nfunction getInternalChannelParam(paramName, defaultValue, options) {\n  if (!options || !options.internalChannelParams) {\n    return defaultValue;\n  }\n  return /** @type {T} */ (options.internalChannelParams[paramName]) ||\n      defaultValue;\n}\n\n/**\n * This WebChannel implementation is branched off goog.net.BrowserChannel\n * for now. Ongoing changes to goog.net.BrowserChannel will be back\n * ported to this implementation as needed.\n *\n * @param {!goog.net.WebChannel.Options=} opt_options Configuration for the\n *        WebChannel instance.\n * @param {number=} opt_clientVersion An application-specific version number\n *        that is sent to the server when connected.\n * @param {!ConnectionState=} opt_conn Previously determined connection\n *        conditions.\n * @constructor\n * @struct\n * @implements {goog.labs.net.webChannel.Channel}\n */\ngoog.labs.net.webChannel.WebChannelBase = function(\n    opt_options, opt_clientVersion, opt_conn) {\n  /**\n   * The client library version (capabilities).\n   * @private {number}\n   */\n  this.clientVersion_ = opt_clientVersion || 0;\n\n  /**\n   * The server library version (capabilities).\n   * @private {number}\n   */\n  this.serverVersion_ = 0;\n\n\n  /**\n   * An array of queued maps that need to be sent to the server.\n   * @private {!Array<Wire.QueuedMap>}\n   */\n  this.outgoingMaps_ = [];\n\n  /**\n   * The channel debug used for logging\n   * @private {!WebChannelDebug}\n   */\n  this.channelDebug_ = new WebChannelDebug();\n\n  /**\n   * Connectivity state.\n   * @private {!ConnectionState}\n   */\n  this.connState_ = opt_conn || new ConnectionState();\n\n  /**\n   * Extra HTTP headers to add to all the requests sent to the server.\n   * @private {?Object}\n   */\n  this.extraHeaders_ = null;\n\n  /**\n   * Extra HTTP headers to add to the init request(s) sent to the server.\n   * @private {?Object}\n   */\n  this.initHeaders_ = null;\n\n  /**\n   * @private {?string} The URL param name to overwrite custom HTTP headers\n   * to bypass CORS preflight.\n   */\n  this.httpHeadersOverwriteParam_ = null;\n\n  /**\n   * Extra parameters to add to all the requests sent to the server.\n   * @private {?Object}\n   */\n  this.extraParams_ = null;\n\n  /**\n   * Parameter name for the http session id.\n   * @private {?string}\n   */\n  this.httpSessionIdParam_ = null;\n\n  /**\n   * The http session id, to be sent with httpSessionIdParam_ with each\n   * request after the initial handshake.\n   * @private {?string}\n   */\n  this.httpSessionId_ = null;\n\n  /**\n   * The ChannelRequest object for the backchannel.\n   * @private {?ChannelRequest}\n   */\n  this.backChannelRequest_ = null;\n\n  /**\n   * The relative path (in the context of the the page hosting the browser\n   * channel) for making requests to the server.\n   * @private {?string}\n   */\n  this.path_ = null;\n\n  /**\n   * The absolute URI for the forwardchannel request.\n   * @private {?goog.Uri}\n   */\n  this.forwardChannelUri_ = null;\n\n  /**\n   * The absolute URI for the backchannel request.\n   * @private {?goog.Uri}\n   */\n  this.backChannelUri_ = null;\n\n  /**\n   * A subdomain prefix for using a subdomain in IE for the backchannel\n   * requests.\n   * @private {?string}\n   */\n  this.hostPrefix_ = null;\n\n  /**\n   * Whether we allow the use of a subdomain in IE for the backchannel requests.\n   * @private {boolean}\n   */\n  this.allowHostPrefix_ = true;\n\n  /**\n   * The next id to use for the RID (request identifier) parameter. This\n   * identifier uniquely identifies the forward channel request.\n   * @private {number}\n   */\n  this.nextRid_ = 0;\n\n  /**\n   * The id to use for the next outgoing map. This identifier uniquely\n   * identifies a sent map.\n   * @private {number}\n   */\n  this.nextMapId_ = 0;\n\n  /**\n   * Whether to fail forward-channel requests after one try or a few tries.\n   * @private {boolean}\n   */\n  this.failFast_ = getInternalChannelParam('failFast', false, opt_options);\n\n  /**\n   * The handler that receive callbacks for state changes and data.\n   * @private {?goog.labs.net.webChannel.WebChannelBase.Handler}\n   */\n  this.handler_ = null;\n\n  /**\n   * Timer identifier for asynchronously making a forward channel request.\n   * This is set to true if the func is scheduled with async.run, which\n   * is equivalent to setTimeout(0).\n   * @private {?number|?boolean}\n   */\n  this.forwardChannelTimerId_ = null;\n\n  /**\n   * Timer identifier for asynchronously making a back channel request.\n   * @private {?number}\n   */\n  this.backChannelTimerId_ = null;\n\n  /**\n   * Timer identifier for the timer that waits for us to retry the backchannel\n   * in the case where it is dead and no longer receiving data.\n   * @private {?number}\n   */\n  this.deadBackChannelTimerId_ = null;\n\n  /**\n   * Whether the client's network conditions can support chunked responses.\n   * @private {?boolean}\n   */\n  this.useChunked_ = null;\n\n  /**\n   * Whether chunked mode is allowed. In certain debugging situations, it's\n   * useful to disable this.\n   * @private {boolean}\n   */\n  this.allowChunkedMode_ = true;\n\n  /**\n   * The array identifier of the last array received from the server for the\n   * backchannel request.\n   * @private {number}\n   */\n  this.lastArrayId_ = -1;\n\n  /**\n   * The array id of the last array sent by the server that we know about.\n   * @private {number}\n   */\n  this.lastPostResponseArrayId_ = -1;\n\n  /**\n   * The last status code received.\n   * @private {number}\n   */\n  this.lastStatusCode_ = -1;\n\n  /**\n   * Number of times we have retried the current forward channel request.\n   * @private {number}\n   */\n  this.forwardChannelRetryCount_ = 0;\n\n  /**\n   * Number of times in a row that we have retried the current back channel\n   * request and received no data.\n   * @private {number}\n   */\n  this.backChannelRetryCount_ = 0;\n\n  /**\n   * The attempt id for the current back channel request. Starts at 1 and\n   * increments for each reconnect. The server uses this to log if our\n   * connection is flaky or not.\n   * @private {number}\n   */\n  this.backChannelAttemptId_ = 0;\n\n  /**\n   * The base part of the time before firing next retry request. Default is 5\n   * seconds. Note that a random delay is added (see {@link retryDelaySeedMs_})\n   * for all retries, and linear backoff is applied to the sum for subsequent\n   * retries.\n   * @private {number}\n   */\n  this.baseRetryDelayMs_ =\n      getInternalChannelParam('baseRetryDelayMs', 5 * 1000, opt_options);\n\n  /**\n   * A random time between 0 and this number of MS is added to the\n   * {@link baseRetryDelayMs_}. Default is 10 seconds.\n   * @private {number}\n   */\n  this.retryDelaySeedMs_ =\n      getInternalChannelParam('retryDelaySeedMs', 10 * 1000, opt_options);\n\n  /**\n   * Maximum number of attempts to connect to the server for forward channel\n   * requests. Defaults to 2.\n   * @private {number}\n   */\n  this.forwardChannelMaxRetries_ =\n      getInternalChannelParam('forwardChannelMaxRetries', 2, opt_options);\n\n  /**\n   * The timeout in milliseconds for a forward channel request. Defaults to 20\n   * seconds. Note that part of this timeout can be randomized.\n   * @private {number}\n   */\n  this.forwardChannelRequestTimeoutMs_ = getInternalChannelParam(\n      'forwardChannelRequestTimeoutMs', 20 * 1000, opt_options);\n\n  /**\n   * The custom factory used to create XMLHttpRequest objects.\n   * @private {!goog.net.XmlHttpFactory | undefined}\n   */\n  this.xmlHttpFactory_ =\n      (opt_options && opt_options.xmlHttpFactory) || undefined;\n\n  /**\n   * The timeout in milliseconds for a back channel request. Defaults to using\n   * the timeout configured in ChannelRequest (45s). If server-side\n   * keepaliveInterval is known to the client, set the backchannel request\n   * timeout to 1.5 * keepaliveInterval (ms).\n   *\n   * @private {number|undefined}\n   */\n  this.backChannelRequestTimeoutMs_ = undefined;\n\n  /**\n   * A throttle time in ms for readystatechange events for the backchannel.\n   * Useful for throttling when ready state is INTERACTIVE (partial data).\n   *\n   * This throttle is useful if the server sends large data chunks down the\n   * backchannel.  It prevents examining XHR partial data on every readystate\n   * change event.  This is useful because large chunks can trigger hundreds\n   * of readystatechange events, each of which takes ~5ms or so to handle,\n   * in turn making the UI unresponsive for a significant period.\n   *\n   * If set to zero no throttle is used.\n   * @private {number}\n   */\n  this.readyStateChangeThrottleMs_ = 0;\n\n  /**\n   * Whether cross origin requests are supported for the channel.\n   *\n   * See {@link goog.net.XhrIo#setWithCredentials}.\n   * @private {boolean}\n   */\n  this.supportsCrossDomainXhrs_ =\n      (opt_options && opt_options.supportsCrossDomainXhr) || false;\n\n  /**\n   * The current session id.\n   * @private {string}\n   */\n  this.sid_ = '';\n\n  /**\n   * The current ChannelRequest pool for the forward channel.\n   * @private {!ForwardChannelRequestPool}\n   */\n  this.forwardChannelRequestPool_ = new ForwardChannelRequestPool(\n      opt_options && opt_options.concurrentRequestLimit);\n\n  /**\n   * The V8 codec.\n   * @private {!WireV8}\n   */\n  this.wireCodec_ = new WireV8();\n\n  /**\n   * Whether to turn on the fast handshake behavior.\n   *\n   * @private {boolean}\n   */\n  this.fastHandshake_ = (opt_options && opt_options.fastHandshake) || false;\n\n  if (opt_options && opt_options.disableRedact) {\n    this.channelDebug_.disableRedact();\n  }\n\n  if (opt_options && opt_options.forceLongPolling) {\n    this.allowChunkedMode_ = false;\n  }\n\n  /**\n   * Callback when all the pending client-sent messages have been flushed.\n   *\n   * @private {function()|undefined}\n   */\n  this.forwardChannelFlushedCallback_ = undefined;\n};\n\nvar WebChannelBase = goog.labs.net.webChannel.WebChannelBase;\n\n\n/**\n * The channel version that we negotiated with the server for this session.\n * Starts out as the version we request, and then is changed to the negotiated\n * version after the initial open.\n * @private {number}\n */\nWebChannelBase.prototype.channelVersion_ = Wire.LATEST_CHANNEL_VERSION;\n\n\n/**\n * Enum type for the channel state machine.\n * @enum {number}\n */\nWebChannelBase.State = {\n  /** The channel is closed. */\n  CLOSED: 0,\n\n  /** The channel has been initialized but hasn't yet initiated a connection. */\n  INIT: 1,\n\n  /** The channel is in the process of opening a connection to the server. */\n  OPENING: 2,\n\n  /** The channel is open. */\n  OPENED: 3\n};\n\n\n/**\n * The current state of the WebChannel.\n * @private {!WebChannelBase.State}\n */\nWebChannelBase.prototype.state_ = WebChannelBase.State.INIT;\n\n\n/**\n * The timeout in milliseconds for a forward channel request.\n * @type {number}\n */\nWebChannelBase.FORWARD_CHANNEL_RETRY_TIMEOUT = 20 * 1000;\n\n\n/**\n * Maximum number of attempts to connect to the server for back channel\n * requests.\n * @type {number}\n */\nWebChannelBase.BACK_CHANNEL_MAX_RETRIES = 3;\n\n\n/**\n * A number in MS of how long we guess the maxmium amount of time a round trip\n * to the server should take. In the future this could be substituted with a\n * real measurement of the RTT.\n * @type {number}\n */\nWebChannelBase.RTT_ESTIMATE = 3 * 1000;\n\n\n/**\n * When retrying for an inactive channel, we will multiply the total delay by\n * this number.\n * @type {number}\n */\nWebChannelBase.INACTIVE_CHANNEL_RETRY_FACTOR = 2;\n\n\n/**\n * Enum type for identifying an error.\n * @enum {number}\n */\nWebChannelBase.Error = {\n  /** Value that indicates no error has occurred. */\n  OK: 0,\n\n  /** An error due to a request failing. */\n  REQUEST_FAILED: 2,\n\n  /** An error due to the user being logged out. */\n  LOGGED_OUT: 4,\n\n  /** An error due to server response which contains no data. */\n  NO_DATA: 5,\n\n  /** An error due to a server response indicating an unknown session id */\n  UNKNOWN_SESSION_ID: 6,\n\n  /** An error due to a server response requesting to stop the channel. */\n  STOP: 7,\n\n  /** A general network error. */\n  NETWORK: 8,\n\n  /** An error due to bad data being returned from the server. */\n  BAD_DATA: 10,\n\n  /** An error due to a response that is not parsable. */\n  BAD_RESPONSE: 11\n};\n\n\n/**\n * Internal enum type for the two channel types.\n * @enum {number}\n * @private\n */\nWebChannelBase.ChannelType_ = {\n  FORWARD_CHANNEL: 1,\n\n  BACK_CHANNEL: 2\n};\n\n\n/**\n * The maximum number of maps that can be sent in one POST. Should match\n * MAX_MAPS_PER_REQUEST on the server code.\n * @type {number}\n * @private\n */\nWebChannelBase.MAX_MAPS_PER_REQUEST_ = 1000;\n\n\n/**\n * The maximum number of utf-8 chars that can be sent in one GET to enable 0-RTT\n * handshake.\n *\n *  @const @private {number}\n */\nWebChannelBase.MAX_CHARS_PER_GET_ = 4 * 1024;\n\n\n/**\n * A guess at a cutoff at which to no longer assume the backchannel is dead\n * when we are slow to receive data. Number in bytes.\n *\n * Assumption: The worst bandwidth we work on is 50 kilobits/sec\n * 50kbits/sec * (1 byte / 8 bits) * 6 sec dead backchannel timeout\n * @type {number}\n */\nWebChannelBase.OUTSTANDING_DATA_BACKCHANNEL_RETRY_CUTOFF = 37500;\n\n\n/**\n * @return {number} The server version or 0 if undefined\n */\nWebChannelBase.prototype.getServerVersion = function() {\n  return this.serverVersion_;\n};\n\n\n/**\n * @return {!ForwardChannelRequestPool} The forward channel request pool.\n */\nWebChannelBase.prototype.getForwardChannelRequestPool = function() {\n  return this.forwardChannelRequestPool_;\n};\n\n\n/**\n * @return {!Object} The codec object.\n */\nWebChannelBase.prototype.getWireCodec = function() {\n  return this.wireCodec_;\n};\n\n\n/**\n * Returns the logger.\n *\n * @return {!WebChannelDebug} The channel debug object.\n */\nWebChannelBase.prototype.getChannelDebug = function() {\n  return this.channelDebug_;\n};\n\n\n/**\n * Sets the logger.\n *\n * @param {!WebChannelDebug} channelDebug The channel debug object.\n */\nWebChannelBase.prototype.setChannelDebug = function(channelDebug) {\n  this.channelDebug_ = channelDebug;\n};\n\n\n/**\n * Starts the channel. This initiates connections to the server.\n *\n * @param {string} channelPath  The path for the channel connection.\n * @param {!Object=} opt_extraParams Extra parameter keys and values to add to\n *     the requests.\n * @param {string=} opt_oldSessionId  Session ID from a previous session.\n * @param {number=} opt_oldArrayId  The last array ID from a previous session.\n */\nWebChannelBase.prototype.connect = function(\n    channelPath, opt_extraParams, opt_oldSessionId, opt_oldArrayId) {\n  this.channelDebug_.debug('connect()');\n\n  requestStats.notifyStatEvent(requestStats.Stat.CONNECT_ATTEMPT);\n\n  this.path_ = channelPath;\n  this.extraParams_ = opt_extraParams || {};\n\n  // Attach parameters about the previous session if reconnecting.\n  if (opt_oldSessionId && opt_oldArrayId !== undefined) {\n    this.extraParams_['OSID'] = opt_oldSessionId;\n    this.extraParams_['OAID'] = opt_oldArrayId;\n  }\n\n  this.useChunked_ = this.allowChunkedMode_;\n  this.connectChannel_();\n};\n\n\n/**\n * Disconnects and closes the channel.\n */\nWebChannelBase.prototype.disconnect = function() {\n  this.channelDebug_.debug('disconnect()');\n\n  this.cancelRequests_();\n\n  if (this.state_ == WebChannelBase.State.OPENED) {\n    var rid = this.nextRid_++;\n    var uri = this.forwardChannelUri_.clone();\n    uri.setParameterValue('SID', this.sid_);\n    uri.setParameterValue('RID', rid);\n    uri.setParameterValue('TYPE', 'terminate');\n\n    // Add the reconnect parameters.\n    this.addAdditionalParams_(uri);\n\n    var request = ChannelRequest.createChannelRequest(\n        this, this.channelDebug_, this.sid_, rid);\n    request.sendCloseRequest(uri);\n  }\n\n  this.onClose_();\n};\n\n\n/**\n * Returns the session id of the channel. Only available after the\n * channel has been opened.\n * @return {string} Session ID.\n */\nWebChannelBase.prototype.getSessionId = function() {\n  return this.sid_;\n};\n\n\n/**\n * Starts the connection.\n * @private\n */\nWebChannelBase.prototype.connectChannel_ = function() {\n  this.channelDebug_.debug('connectChannel_()');\n  this.ensureInState_(WebChannelBase.State.INIT, WebChannelBase.State.CLOSED);\n  this.forwardChannelUri_ =\n      this.getForwardChannelUri(/** @type {string} */ (this.path_));\n  this.ensureForwardChannel_();\n};\n\n\n/**\n * Cancels all outstanding requests.\n * @private\n */\nWebChannelBase.prototype.cancelRequests_ = function() {\n  if (this.backChannelRequest_) {\n    this.backChannelRequest_.cancel();\n    this.backChannelRequest_ = null;\n  }\n\n  if (this.backChannelTimerId_) {\n    goog.global.clearTimeout(this.backChannelTimerId_);\n    this.backChannelTimerId_ = null;\n  }\n\n  this.clearDeadBackchannelTimer_();\n\n  this.forwardChannelRequestPool_.cancel();\n\n  if (this.forwardChannelTimerId_) {\n    this.clearForwardChannelTimer_();\n  }\n};\n\n\n/**\n * Clears the forward channel timer.\n * @private\n */\nWebChannelBase.prototype.clearForwardChannelTimer_ = function() {\n  if (typeof this.forwardChannelTimerId_ === 'number') {\n    goog.global.clearTimeout(this.forwardChannelTimerId_);\n  }\n\n  this.forwardChannelTimerId_ = null;\n};\n\n\n/**\n * Returns the extra HTTP headers to add to all the requests sent to the server.\n *\n * @return {Object} The HTTP headers, or null.\n */\nWebChannelBase.prototype.getExtraHeaders = function() {\n  return this.extraHeaders_;\n};\n\n\n/**\n * Sets extra HTTP headers to add to all the requests sent to the server.\n *\n * @param {Object} extraHeaders The HTTP headers, or null.\n */\nWebChannelBase.prototype.setExtraHeaders = function(extraHeaders) {\n  this.extraHeaders_ = extraHeaders;\n};\n\n\n/**\n * Returns the extra HTTP headers to add to the init requests\n * sent to the server.\n *\n * @return {Object} The HTTP headers, or null.\n */\nWebChannelBase.prototype.getInitHeaders = function() {\n  return this.initHeaders_;\n};\n\n\n/**\n * Sets extra HTTP headers to add to the init requests sent to the server.\n *\n * @param {Object} initHeaders The HTTP headers, or null.\n */\nWebChannelBase.prototype.setInitHeaders = function(initHeaders) {\n  this.initHeaders_ = initHeaders;\n};\n\n\n/**\n * Sets the URL param name to overwrite custom HTTP headers.\n *\n * @param {string} httpHeadersOverwriteParam The URL param name.\n */\nWebChannelBase.prototype.setHttpHeadersOverwriteParam = function(\n    httpHeadersOverwriteParam) {\n  this.httpHeadersOverwriteParam_ = httpHeadersOverwriteParam;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.setHttpSessionIdParam = function(httpSessionIdParam) {\n  this.httpSessionIdParam_ = httpSessionIdParam;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.getHttpSessionIdParam = function() {\n  return this.httpSessionIdParam_;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.setHttpSessionId = function(httpSessionId) {\n  this.httpSessionId_ = httpSessionId;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.getHttpSessionId = function() {\n  return this.httpSessionId_;\n};\n\n\n/**\n * Sets the throttle for handling onreadystatechange events for the request.\n *\n * @param {number} throttle The throttle in ms.  A value of zero indicates\n *     no throttle.\n */\nWebChannelBase.prototype.setReadyStateChangeThrottle = function(throttle) {\n  this.readyStateChangeThrottleMs_ = throttle;\n};\n\n\n/**\n * Sets whether cross origin requests are supported for the channel.\n *\n * Setting this allows the creation of requests to secondary domains and\n * sends XHRs with the CORS withCredentials bit set to true.\n *\n * In order for cross-origin requests to work, the server will also need to set\n * CORS response headers as per:\n * https://developer.mozilla.org/en-US/docs/HTTP_access_control\n *\n * See {@link goog.net.XhrIo#setWithCredentials}.\n * @param {boolean} supportCrossDomain Whether cross domain XHRs are supported.\n */\nWebChannelBase.prototype.setSupportsCrossDomainXhrs = function(\n    supportCrossDomain) {\n  this.supportsCrossDomainXhrs_ = supportCrossDomain;\n};\n\n\n/**\n * Returns the handler used for channel callback events.\n *\n * @return {WebChannelBase.Handler} The handler.\n */\nWebChannelBase.prototype.getHandler = function() {\n  return this.handler_;\n};\n\n\n/**\n * Sets the handler used for channel callback events.\n * @param {WebChannelBase.Handler} handler The handler to set.\n */\nWebChannelBase.prototype.setHandler = function(handler) {\n  this.handler_ = handler;\n};\n\n\n/**\n * Returns whether the channel allows the use of a subdomain. There may be\n * cases where this isn't allowed.\n * @return {boolean} Whether a host prefix is allowed.\n */\nWebChannelBase.prototype.getAllowHostPrefix = function() {\n  return this.allowHostPrefix_;\n};\n\n\n/**\n * Sets whether the channel allows the use of a subdomain. There may be cases\n * where this isn't allowed, for example, logging in with troutboard where\n * using a subdomain causes Apache to force the user to authenticate twice.\n * @param {boolean} allowHostPrefix Whether a host prefix is allowed.\n */\nWebChannelBase.prototype.setAllowHostPrefix = function(allowHostPrefix) {\n  this.allowHostPrefix_ = allowHostPrefix;\n};\n\n\n/**\n * Returns whether the channel is buffered or not.  This may be\n * queried in the WebChannelBase.okToMakeRequest() callback.\n *\n * @return {boolean} Whether the channel is buffered.\n */\nWebChannelBase.prototype.isBuffered = function() {\n  return !this.useChunked_;\n};\n\n\n/**\n * Returns whether chunked mode is allowed. In certain debugging situations,\n * it's useful for the application to have a way to disable chunked mode for a\n * user.\n\n * @return {boolean} Whether chunked mode is allowed.\n */\nWebChannelBase.prototype.getAllowChunkedMode = function() {\n  return this.allowChunkedMode_;\n};\n\n\n/**\n * Sets whether chunked mode is allowed. In certain debugging situations, it's\n * useful for the application to have a way to disable chunked mode for a user.\n * @param {boolean} allowChunkedMode  Whether chunked mode is allowed.\n */\nWebChannelBase.prototype.setAllowChunkedMode = function(allowChunkedMode) {\n  this.allowChunkedMode_ = allowChunkedMode;\n};\n\n\n/**\n * Sends a request to the server. The format of the request is a Map data\n * structure of key/value pairs. These maps are then encoded in a format\n * suitable for the wire and then reconstituted as a Map data structure that\n * the server can process.\n * @param {!Object|!goog.structs.Map} map The map to send.\n * @param {!Object=} opt_context The context associated with the map.\n */\nWebChannelBase.prototype.sendMap = function(map, opt_context) {\n  goog.asserts.assert(\n      this.state_ != WebChannelBase.State.CLOSED,\n      'Invalid operation: sending map when state is closed');\n\n  // We can only send 1000 maps per POST, but typically we should never have\n  // that much to send, so warn if we exceed that (we still send all the maps).\n  if (this.outgoingMaps_.length == WebChannelBase.MAX_MAPS_PER_REQUEST_) {\n    // severe() is temporary so that we get these uploaded and can figure out\n    // what's causing them. Afterwards can change to warning().\n    this.channelDebug_.severe(function() {\n      return 'Already have ' + WebChannelBase.MAX_MAPS_PER_REQUEST_ +\n          ' queued maps upon queueing ' + goog.json.serialize(map);\n    });\n  }\n\n  this.outgoingMaps_.push(\n      new Wire.QueuedMap(this.nextMapId_++, map, opt_context));\n\n  // Messages need be buffered during OPENING to avoid server-side race\n  if (this.state_ == WebChannelBase.State.OPENED) {\n    this.ensureForwardChannel_();\n  }\n};\n\n\n/**\n * When set to true, this changes the behavior of the forward channel so it\n * will not retry requests; it will fail after one network failure, and if\n * there was already one network failure, the request will fail immediately.\n * @param {boolean} failFast  Whether or not to fail fast.\n */\nWebChannelBase.prototype.setFailFast = function(failFast) {\n  this.failFast_ = failFast;\n  this.channelDebug_.info('setFailFast: ' + failFast);\n  if ((this.forwardChannelRequestPool_.hasPendingRequest() ||\n       this.forwardChannelTimerId_) &&\n      this.forwardChannelRetryCount_ > this.getForwardChannelMaxRetries()) {\n    var self = this;\n    this.channelDebug_.info(function() {\n      return 'Retry count ' + self.forwardChannelRetryCount_ +\n          ' > new maxRetries ' + self.getForwardChannelMaxRetries() +\n          '. Fail immediately!';\n    });\n\n    if (!this.forwardChannelRequestPool_.forceComplete(\n            goog.bind(this.onRequestComplete, this))) {\n      // i.e., this.forwardChannelTimerId_\n      this.clearForwardChannelTimer_();\n      // The error code from the last failed request is gone, so just use a\n      // generic one.\n      this.signalError_(WebChannelBase.Error.REQUEST_FAILED);\n    }\n  }\n};\n\n\n/**\n * @return {number} The max number of forward-channel retries, which will be 0\n * in fail-fast mode.\n */\nWebChannelBase.prototype.getForwardChannelMaxRetries = function() {\n  return this.failFast_ ? 0 : this.forwardChannelMaxRetries_;\n};\n\n\n/**\n * Sets the maximum number of attempts to connect to the server for forward\n * channel requests.\n * @param {number} retries The maximum number of attempts.\n */\nWebChannelBase.prototype.setForwardChannelMaxRetries = function(retries) {\n  this.forwardChannelMaxRetries_ = retries;\n};\n\n\n/**\n * Sets the timeout for a forward channel request.\n * @param {number} timeoutMs The timeout in milliseconds.\n */\nWebChannelBase.prototype.setForwardChannelRequestTimeout = function(timeoutMs) {\n  this.forwardChannelRequestTimeoutMs_ = timeoutMs;\n};\n\n\n/**\n * @return {number} The max number of back-channel retries, which is a constant.\n */\nWebChannelBase.prototype.getBackChannelMaxRetries = function() {\n  // Back-channel retries is a constant.\n  return WebChannelBase.BACK_CHANNEL_MAX_RETRIES;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.isClosed = function() {\n  return this.state_ == WebChannelBase.State.CLOSED;\n};\n\n\n/**\n * Returns the channel state.\n * @return {WebChannelBase.State} The current state of the channel.\n */\nWebChannelBase.prototype.getState = function() {\n  return this.state_;\n};\n\n\n/**\n * Return the last status code received for a request.\n * @return {number} The last status code received for a request.\n */\nWebChannelBase.prototype.getLastStatusCode = function() {\n  return this.lastStatusCode_;\n};\n\n\n/**\n * @return {number} The last array id received.\n */\nWebChannelBase.prototype.getLastArrayId = function() {\n  return this.lastArrayId_;\n};\n\n\n/**\n * Returns whether there are outstanding requests servicing the channel.\n * @return {boolean} true if there are outstanding requests.\n */\nWebChannelBase.prototype.hasOutstandingRequests = function() {\n  return this.getOutstandingRequests_() != 0;\n};\n\n\n/**\n * Returns the number of outstanding requests.\n * @return {number} The number of outstanding requests to the server.\n * @private\n */\nWebChannelBase.prototype.getOutstandingRequests_ = function() {\n  var count = 0;\n  if (this.backChannelRequest_) {\n    count++;\n  }\n  count += this.forwardChannelRequestPool_.getRequestCount();\n  return count;\n};\n\n\n/**\n * Ensures that a forward channel request is scheduled.\n * @private\n */\nWebChannelBase.prototype.ensureForwardChannel_ = function() {\n  if (this.forwardChannelRequestPool_.isFull()) {\n    // enough connection in process - no need to start a new request\n    return;\n  }\n\n  if (this.forwardChannelTimerId_) {\n    // no need to start a new request - one is already scheduled\n    return;\n  }\n\n  // Use async.run instead of setTimeout(0) to avoid the 1s message delay\n  // from chrome/firefox background tabs\n  this.forwardChannelTimerId_ = true;\n  goog.async.run(this.onStartForwardChannelTimer_, this);\n\n  this.forwardChannelRetryCount_ = 0;\n};\n\n\n/**\n * Schedules a forward-channel retry for the specified request, unless the max\n * retries has been reached.\n * @param {!ChannelRequest} request The failed request to retry.\n * @return {boolean} true iff a retry was scheduled.\n * @private\n */\nWebChannelBase.prototype.maybeRetryForwardChannel_ = function(request) {\n  if (this.forwardChannelRequestPool_.getRequestCount() >=\n      this.forwardChannelRequestPool_.getMaxSize() -\n          (this.forwardChannelTimerId_ ? 1 : 0)) {\n    // Should be impossible to be called in this state.\n    this.channelDebug_.severe('Unexpected retry request is scheduled.');\n    return false;\n  }\n\n  if (this.forwardChannelTimerId_) {\n    this.channelDebug_.debug(\n        'Use the retry request that is already scheduled.');\n    this.outgoingMaps_ =\n        request.getPendingMessages().concat(this.outgoingMaps_);\n    return true;\n  }\n\n  // No retry for open_() and fail-fast\n  if (this.state_ == WebChannelBase.State.INIT ||\n      this.state_ == WebChannelBase.State.OPENING ||\n      (this.forwardChannelRetryCount_ >= this.getForwardChannelMaxRetries())) {\n    return false;\n  }\n\n  this.channelDebug_.debug('Going to retry POST');\n\n  this.forwardChannelTimerId_ = requestStats.setTimeout(\n      goog.bind(this.onStartForwardChannelTimer_, this, request),\n      this.getRetryTime_(this.forwardChannelRetryCount_));\n  this.forwardChannelRetryCount_++;\n  return true;\n};\n\n\n/**\n * Timer callback for ensureForwardChannel\n * @param {ChannelRequest=} opt_retryRequest A failed request\n * to retry.\n * @private\n */\nWebChannelBase.prototype.onStartForwardChannelTimer_ = function(\n    opt_retryRequest) {\n  // null is possible if scheduled with async.run\n  if (this.forwardChannelTimerId_) {\n    this.forwardChannelTimerId_ = null;\n    this.startForwardChannel_(opt_retryRequest);\n  }\n};\n\n\n/**\n * Begins a new forward channel operation to the server.\n * @param {ChannelRequest=} opt_retryRequest A failed request to retry.\n * @private\n */\nWebChannelBase.prototype.startForwardChannel_ = function(opt_retryRequest) {\n  this.channelDebug_.debug('startForwardChannel_');\n  if (!this.okToMakeRequest_()) {\n    return;  // channel is cancelled\n  } else if (this.state_ == WebChannelBase.State.INIT) {\n    if (opt_retryRequest) {\n      this.channelDebug_.severe('Not supposed to retry the open');\n      return;\n    }\n    this.open_();\n    this.state_ = WebChannelBase.State.OPENING;\n  } else if (this.state_ == WebChannelBase.State.OPENED) {\n    if (opt_retryRequest) {\n      this.makeForwardChannelRequest_(opt_retryRequest);\n      return;\n    }\n\n    if (this.outgoingMaps_.length == 0) {\n      this.channelDebug_.debug(\n          'startForwardChannel_ returned: ' +\n          'nothing to send');\n      // no need to start a new forward channel request\n      return;\n    }\n\n    if (this.forwardChannelRequestPool_.isFull()) {\n      // Should be impossible to be called in this state.\n      this.channelDebug_.severe(\n          'startForwardChannel_ returned: ' +\n          'connection already in progress');\n      return;\n    }\n\n    this.makeForwardChannelRequest_();\n    this.channelDebug_.debug('startForwardChannel_ finished, sent request');\n  }\n};\n\n\n/**\n * Establishes a new channel session with the the server.\n * @private\n */\nWebChannelBase.prototype.open_ = function() {\n  this.channelDebug_.debug('open_()');\n  this.nextRid_ = Math.floor(Math.random() * 100000);\n\n  var rid = this.nextRid_++;\n  var request =\n      ChannelRequest.createChannelRequest(this, this.channelDebug_, '', rid);\n\n  // mix the init headers\n  var extraHeaders = this.extraHeaders_;\n  if (this.initHeaders_) {\n    if (extraHeaders) {\n      extraHeaders = goog.object.clone(extraHeaders);\n      goog.object.extend(extraHeaders, this.initHeaders_);\n    } else {\n      extraHeaders = this.initHeaders_;\n    }\n  }\n\n  if (this.httpHeadersOverwriteParam_ === null) {\n    request.setExtraHeaders(extraHeaders);\n  }\n\n  var requestText = this.dequeueOutgoingMaps_(\n      request,\n      this.fastHandshake_ ? this.getMaxNumMessagesForFastHandshake_() :\n                            WebChannelBase.MAX_MAPS_PER_REQUEST_);\n\n  var uri = this.forwardChannelUri_.clone();\n  uri.setParameterValue('RID', rid);\n\n  if (this.clientVersion_ > 0) {\n    uri.setParameterValue('CVER', this.clientVersion_);\n  }\n\n  // http-session-id to be generated as the response\n  if (this.getHttpSessionIdParam()) {\n    uri.setParameterValue(\n        WebChannel.X_HTTP_SESSION_ID, this.getHttpSessionIdParam());\n  }\n\n  // Add the reconnect parameters.\n  this.addAdditionalParams_(uri);\n\n  if (this.httpHeadersOverwriteParam_ && extraHeaders) {\n    httpCors.setHttpHeadersWithOverwriteParam(\n        uri, this.httpHeadersOverwriteParam_, extraHeaders);\n  }\n\n  this.forwardChannelRequestPool_.addRequest(request);\n\n  // Check the option and use GET to enable QUIC 0-RTT\n  if (this.fastHandshake_) {\n    uri.setParameterValue('$req', requestText);\n\n    // enable handshake upgrade\n    uri.setParameterValue('SID', 'null');\n    request.setDecodeInitialResponse();\n\n    request.xmlHttpPost(uri, null, true);  // Send as a GET\n  } else {\n    request.xmlHttpPost(uri, requestText, true);\n  }\n};\n\n\n/**\n * @return {number} The number of raw JSON messages to be encoded\n * with the fast-handshake (GET) request, including zero. If messages are not\n * encoded as raw JSON data, return WebChannelBase.MAX_MAPS_PER_REQUEST_\n * @private\n */\nWebChannelBase.prototype.getMaxNumMessagesForFastHandshake_ = function() {\n  var total = 0;\n  for (var i = 0; i < this.outgoingMaps_.length; i++) {\n    var map = this.outgoingMaps_[i];\n    var size = map.getRawDataSize();\n    if (size === undefined) {\n      break;\n    }\n    total += size;\n\n    if (total > WebChannelBase.MAX_CHARS_PER_GET_) {\n      return i;\n    }\n\n    if (total === WebChannelBase.MAX_CHARS_PER_GET_ ||\n        i === this.outgoingMaps_.length - 1) {\n      return i + 1;\n    }\n  }\n\n  return WebChannelBase.MAX_MAPS_PER_REQUEST_;\n};\n\n\n\n/**\n * Makes a forward channel request using XMLHTTP.\n * @param {!ChannelRequest=} opt_retryRequest A failed request to retry.\n * @private\n */\nWebChannelBase.prototype.makeForwardChannelRequest_ = function(\n    opt_retryRequest) {\n  var rid;\n  if (opt_retryRequest) {\n    rid = opt_retryRequest.getRequestId();  // Reuse the same RID for a retry\n  } else {\n    rid = this.nextRid_++;\n  }\n\n  var uri = this.forwardChannelUri_.clone();\n  uri.setParameterValue('SID', this.sid_);\n  uri.setParameterValue('RID', rid);\n  uri.setParameterValue('AID', this.lastArrayId_);\n  // Add the additional reconnect parameters.\n  this.addAdditionalParams_(uri);\n\n  if (this.httpHeadersOverwriteParam_ && this.extraHeaders_) {\n    httpCors.setHttpHeadersWithOverwriteParam(\n        uri, this.httpHeadersOverwriteParam_, this.extraHeaders_);\n  }\n\n  var request = ChannelRequest.createChannelRequest(\n      this, this.channelDebug_, this.sid_, rid,\n      this.forwardChannelRetryCount_ + 1);\n\n  if (this.httpHeadersOverwriteParam_ === null) {\n    request.setExtraHeaders(this.extraHeaders_);\n  }\n\n  var requestText;\n  if (opt_retryRequest) {\n    this.requeuePendingMaps_(opt_retryRequest);\n  }\n  requestText =\n      this.dequeueOutgoingMaps_(request, WebChannelBase.MAX_MAPS_PER_REQUEST_);\n\n  // Randomize from 50%-100% of the forward channel timeout to avoid\n  // a big hit if servers happen to die at once.\n  request.setTimeout(\n      Math.round(this.forwardChannelRequestTimeoutMs_ * 0.50) +\n      Math.round(this.forwardChannelRequestTimeoutMs_ * 0.50 * Math.random()));\n  this.forwardChannelRequestPool_.addRequest(request);\n  request.xmlHttpPost(uri, requestText, true);\n};\n\n\n/**\n * Adds the additional parameters from the handler to the given URI.\n * @param {!goog.Uri} uri The URI to add the parameters to.\n * @private\n */\nWebChannelBase.prototype.addAdditionalParams_ = function(uri) {\n  // Add the additional reconnect parameters as needed.\n  if (this.handler_) {\n    var params = this.handler_.getAdditionalParams(this);\n    if (params) {\n      goog.structs.forEach(params, function(value, key, coll) {\n        uri.setParameterValue(key, value);\n      });\n    }\n  }\n};\n\n\n/**\n * Returns the request text from the outgoing maps and resets it.\n * @param {!ChannelRequest} request The new request for sending the messages.\n * @param {number} maxNum The maximum number of messages to be encoded\n * @return {string} The encoded request text created from all the currently\n *                  queued outgoing maps.\n * @private\n */\nWebChannelBase.prototype.dequeueOutgoingMaps_ = function(request, maxNum) {\n  var count = Math.min(this.outgoingMaps_.length, maxNum);\n\n  var badMapHandler = this.handler_ ?\n      goog.bind(this.handler_.badMapError, this.handler_, this) :\n      null;\n  var result = this.wireCodec_.encodeMessageQueue(\n      this.outgoingMaps_, count, badMapHandler);\n\n  request.setPendingMessages(this.outgoingMaps_.splice(0, count));\n\n  return result;\n};\n\n\n/**\n * Requeues unacknowledged sent arrays for retransmission in the next forward\n * channel request.\n * @param {!ChannelRequest} retryRequest A failed request to retry.\n * @private\n */\nWebChannelBase.prototype.requeuePendingMaps_ = function(retryRequest) {\n  this.outgoingMaps_ =\n      retryRequest.getPendingMessages().concat(this.outgoingMaps_);\n};\n\n\n/**\n * Ensures there is a backchannel request for receiving data from the server.\n * @private\n */\nWebChannelBase.prototype.ensureBackChannel_ = function() {\n  if (this.backChannelRequest_) {\n    // already have one\n    return;\n  }\n\n  if (this.backChannelTimerId_) {\n    // no need to start a new request - one is already scheduled\n    return;\n  }\n\n  this.backChannelAttemptId_ = 1;\n\n  // Use async.run instead of setTimeout(0) to avoid the 1s message delay\n  // from chrome/firefox background tabs\n  // backChannelTimerId_ stays unset, as with setTimeout(0)\n  goog.async.run(this.onStartBackChannelTimer_, this);\n\n  this.backChannelRetryCount_ = 0;\n};\n\n\n/**\n * Schedules a back-channel retry, unless the max retries has been reached.\n * @return {boolean} true iff a retry was scheduled.\n * @private\n */\nWebChannelBase.prototype.maybeRetryBackChannel_ = function() {\n  if (this.backChannelRequest_ || this.backChannelTimerId_) {\n    // Should be impossible to be called in this state.\n    this.channelDebug_.severe('Request already in progress');\n    return false;\n  }\n\n  if (this.backChannelRetryCount_ >= this.getBackChannelMaxRetries()) {\n    return false;\n  }\n\n  this.channelDebug_.debug('Going to retry GET');\n\n  this.backChannelAttemptId_++;\n  this.backChannelTimerId_ = requestStats.setTimeout(\n      goog.bind(this.onStartBackChannelTimer_, this),\n      this.getRetryTime_(this.backChannelRetryCount_));\n  this.backChannelRetryCount_++;\n  return true;\n};\n\n\n/**\n * Timer callback for ensureBackChannel_.\n * @private\n */\nWebChannelBase.prototype.onStartBackChannelTimer_ = function() {\n  this.backChannelTimerId_ = null;\n  this.startBackChannel_();\n};\n\n\n/**\n * Begins a new back channel operation to the server.\n * @private\n */\nWebChannelBase.prototype.startBackChannel_ = function() {\n  if (!this.okToMakeRequest_()) {\n    // channel is cancelled\n    return;\n  }\n\n  this.channelDebug_.debug('Creating new HttpRequest');\n  this.backChannelRequest_ = ChannelRequest.createChannelRequest(\n      this, this.channelDebug_, this.sid_, 'rpc', this.backChannelAttemptId_);\n\n  if (this.httpHeadersOverwriteParam_ === null) {\n    this.backChannelRequest_.setExtraHeaders(this.extraHeaders_);\n  }\n\n  this.backChannelRequest_.setReadyStateChangeThrottle(\n      this.readyStateChangeThrottleMs_);\n  var uri = this.backChannelUri_.clone();\n  uri.setParameterValue('RID', 'rpc');\n  uri.setParameterValue('SID', this.sid_);\n  uri.setParameterValue('CI', this.useChunked_ ? '0' : '1');\n  uri.setParameterValue('AID', this.lastArrayId_);\n\n  // Add the reconnect parameters.\n  this.addAdditionalParams_(uri);\n\n  uri.setParameterValue('TYPE', 'xmlhttp');\n\n  if (this.httpHeadersOverwriteParam_ && this.extraHeaders_) {\n    httpCors.setHttpHeadersWithOverwriteParam(\n        uri, this.httpHeadersOverwriteParam_, this.extraHeaders_);\n  }\n\n  if (this.backChannelRequestTimeoutMs_) {\n    this.backChannelRequest_.setTimeout(this.backChannelRequestTimeoutMs_);\n  }\n\n  this.backChannelRequest_.xmlHttpGet(\n      uri, true /* decodeChunks */, this.hostPrefix_);\n\n  this.channelDebug_.debug('New Request created');\n};\n\n\n/**\n * Gives the handler a chance to return an error code and stop channel\n * execution. A handler might want to do this to check that the user is still\n * logged in, for example.\n * @private\n * @return {boolean} If it's OK to make a request.\n */\nWebChannelBase.prototype.okToMakeRequest_ = function() {\n  if (this.handler_) {\n    var result = this.handler_.okToMakeRequest(this);\n    if (result != WebChannelBase.Error.OK) {\n      this.channelDebug_.debug(\n          'Handler returned error code from okToMakeRequest');\n      this.signalError_(result);\n      return false;\n    }\n  }\n  return true;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.onRequestData = function(request, responseText) {\n  if (this.state_ == WebChannelBase.State.CLOSED ||\n      (this.backChannelRequest_ != request &&\n       !this.forwardChannelRequestPool_.hasRequest(request))) {\n    // either CLOSED or a request we don't know about (perhaps an old request)\n    return;\n  }\n  this.lastStatusCode_ = request.getLastStatusCode();\n\n  // first to check if request has been upgraded to backchannel\n  if (!request.isInitialResponseDecoded() &&\n      this.forwardChannelRequestPool_.hasRequest(request) &&\n      this.state_ == WebChannelBase.State.OPENED) {\n    var response;\n    try {\n      response = this.wireCodec_.decodeMessage(responseText);\n    } catch (ex) {\n      response = null;\n    }\n    if (Array.isArray(response) && response.length == 3) {\n      this.handlePostResponse_(/** @type {!Array<?>} */ (response), request);\n      this.onForwardChannelFlushed_();\n    } else {\n      this.channelDebug_.debug('Bad POST response data returned');\n      this.signalError_(WebChannelBase.Error.BAD_RESPONSE);\n    }\n  } else {\n    if (request.isInitialResponseDecoded() ||\n        this.backChannelRequest_ == request) {\n      this.clearDeadBackchannelTimer_();\n    }\n    if (!goog.string.isEmptyOrWhitespace(responseText)) {\n      var response = this.wireCodec_.decodeMessage(responseText);\n      this.onInput_(/** @type {!Array<?>} */ (response), request);\n    }\n  }\n};\n\n\n/**\n * Checks if we need call the flush callback.\n *\n * @private\n */\nWebChannelBase.prototype.onForwardChannelFlushed_ = function() {\n  if (this.forwardChannelRequestPool_.getRequestCount() <= 1) {\n    if (this.forwardChannelFlushedCallback_) {\n      try {\n        this.forwardChannelFlushedCallback_();\n      } catch (ex) {\n        this.channelDebug_.dumpException(\n            ex, 'Exception from forwardChannelFlushedCallback_ ');\n      }\n      // reset\n      this.forwardChannelFlushedCallback_ = undefined;\n    }\n  }\n};\n\n\n/**\n * Handles a POST response from the server.\n * @param {Array<number>} responseValues The key value pairs in\n *     the POST response.\n * @param {!ChannelRequest} forwardReq The forward channel request that\n * triggers this function call.\n * @private\n */\nWebChannelBase.prototype.handlePostResponse_ = function(\n    responseValues, forwardReq) {\n  // The first response value is set to 0 if server is missing backchannel.\n  if (responseValues[0] == 0) {\n    this.handleBackchannelMissing_(forwardReq);\n    return;\n  }\n  this.lastPostResponseArrayId_ = responseValues[1];\n  var outstandingArrays = this.lastPostResponseArrayId_ - this.lastArrayId_;\n  if (0 < outstandingArrays) {\n    var numOutstandingBackchannelBytes = responseValues[2];\n    this.channelDebug_.debug(\n        numOutstandingBackchannelBytes + ' bytes (in ' + outstandingArrays +\n        ' arrays) are outstanding on the BackChannel');\n    if (!this.shouldRetryBackChannel_(numOutstandingBackchannelBytes)) {\n      return;\n    }\n    if (!this.deadBackChannelTimerId_) {\n      // We expect to receive data within 2 RTTs or we retry the backchannel.\n      this.deadBackChannelTimerId_ = requestStats.setTimeout(\n          goog.bind(this.onBackChannelDead_, this),\n          2 * WebChannelBase.RTT_ESTIMATE);\n    }\n  }\n};\n\n\n/**\n * Handles a POST response from the server telling us that it has detected that\n * we have no hanging GET connection.\n * @param {!ChannelRequest} forwardReq The forward channel request that\n * triggers this function call.\n * @private\n */\nWebChannelBase.prototype.handleBackchannelMissing_ = function(forwardReq) {\n  // As long as the back channel was started before the POST was sent,\n  // we should retry the backchannel. We give a slight buffer of RTT_ESTIMATE\n  // so as not to excessively retry the backchannel\n  this.channelDebug_.debug('Server claims our backchannel is missing.');\n  if (this.backChannelTimerId_) {\n    this.channelDebug_.debug('But we are currently starting the request.');\n    return;\n  } else if (!this.backChannelRequest_) {\n    this.channelDebug_.warning('We do not have a BackChannel established');\n  } else if (\n      this.backChannelRequest_.getRequestStartTime() +\n          WebChannelBase.RTT_ESTIMATE <\n      forwardReq.getRequestStartTime()) {\n    this.clearDeadBackchannelTimer_();\n    this.backChannelRequest_.cancel();\n    this.backChannelRequest_ = null;\n  } else {\n    return;\n  }\n  this.maybeRetryBackChannel_();\n  requestStats.notifyStatEvent(requestStats.Stat.BACKCHANNEL_MISSING);\n};\n\n\n/**\n * Determines whether we should start the process of retrying a possibly\n * dead backchannel.\n * @param {number} outstandingBytes The number of bytes for which the server has\n *     not yet received acknowledgement.\n * @return {boolean} Whether to start the backchannel retry timer.\n * @private\n */\nWebChannelBase.prototype.shouldRetryBackChannel_ = function(outstandingBytes) {\n  // Not too many outstanding bytes, not buffered and not after a retry.\n  return outstandingBytes <\n      WebChannelBase.OUTSTANDING_DATA_BACKCHANNEL_RETRY_CUTOFF &&\n      !this.isBuffered() && this.backChannelRetryCount_ == 0;\n};\n\n\n/**\n * Decides which host prefix should be used, if any.  If there is a handler,\n * allows the handler to validate a host prefix provided by the server, and\n * optionally override it.\n * @param {?string} serverHostPrefix The host prefix provided by the server.\n * @return {?string} The host prefix to actually use, if any. Will return null\n *     if the use of host prefixes was disabled via setAllowHostPrefix().\n * @override\n */\nWebChannelBase.prototype.correctHostPrefix = function(serverHostPrefix) {\n  if (this.allowHostPrefix_) {\n    if (this.handler_) {\n      return this.handler_.correctHostPrefix(serverHostPrefix);\n    }\n    return serverHostPrefix;\n  }\n  return null;\n};\n\n\n/**\n * Handles the timer that indicates that our backchannel is no longer able to\n * successfully receive data from the server.\n * @private\n */\nWebChannelBase.prototype.onBackChannelDead_ = function() {\n  if (this.deadBackChannelTimerId_ != null) {\n    this.deadBackChannelTimerId_ = null;\n    this.backChannelRequest_.cancel();\n    this.backChannelRequest_ = null;\n    this.maybeRetryBackChannel_();\n    requestStats.notifyStatEvent(requestStats.Stat.BACKCHANNEL_DEAD);\n  }\n};\n\n\n/**\n * Clears the timer that indicates that our backchannel is no longer able to\n * successfully receive data from the server.\n * @private\n */\nWebChannelBase.prototype.clearDeadBackchannelTimer_ = function() {\n  if (this.deadBackChannelTimerId_ != null) {\n    goog.global.clearTimeout(this.deadBackChannelTimerId_);\n    this.deadBackChannelTimerId_ = null;\n  }\n};\n\n\n/**\n * Returns whether or not the given error/status combination is fatal or not.\n * On fatal errors we immediately close the session rather than retrying the\n * failed request.\n * @param {?ChannelRequest.Error} error The error code for the\n * failed request.\n * @param {number} statusCode The last HTTP status code.\n * @return {boolean} Whether or not the error is fatal.\n * @private\n */\nWebChannelBase.isFatalError_ = function(error, statusCode) {\n  return error == ChannelRequest.Error.UNKNOWN_SESSION_ID ||\n      (error == ChannelRequest.Error.STATUS && statusCode > 0);\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.onRequestComplete = function(request) {\n  this.channelDebug_.debug('Request complete');\n  var type;\n  var pendingMessages = null;\n  if (this.backChannelRequest_ == request) {\n    this.clearDeadBackchannelTimer_();\n    this.backChannelRequest_ = null;\n    type = WebChannelBase.ChannelType_.BACK_CHANNEL;\n  } else if (this.forwardChannelRequestPool_.hasRequest(request)) {\n    pendingMessages = request.getPendingMessages();\n    this.forwardChannelRequestPool_.removeRequest(request);\n    type = WebChannelBase.ChannelType_.FORWARD_CHANNEL;\n  } else {\n    // return if it was an old request from a previous session\n    return;\n  }\n\n  this.lastStatusCode_ = request.getLastStatusCode();\n\n  if (this.state_ == WebChannelBase.State.CLOSED) {\n    return;\n  }\n\n  if (request.getSuccess()) {\n    // Yay!\n    if (type == WebChannelBase.ChannelType_.FORWARD_CHANNEL) {\n      var size = request.getPostData() ? request.getPostData().length : 0;\n      requestStats.notifyTimingEvent(\n          size, goog.now() - request.getRequestStartTime(),\n          this.forwardChannelRetryCount_);\n      this.ensureForwardChannel_();\n      this.onSuccess_(request);\n    } else {  // i.e., back-channel\n      this.ensureBackChannel_();\n    }\n    return;\n  }\n  // Else unsuccessful. Fall through.\n\n  var lastError = request.getLastError();\n  if (!WebChannelBase.isFatalError_(lastError, this.lastStatusCode_)) {\n    // Maybe retry.\n    var self = this;\n    this.channelDebug_.debug(function() {\n      return 'Maybe retrying, last error: ' +\n          ChannelRequest.errorStringFromCode(lastError, self.lastStatusCode_);\n    });\n    if (type == WebChannelBase.ChannelType_.FORWARD_CHANNEL) {\n      if (this.maybeRetryForwardChannel_(request)) {\n        return;\n      }\n    }\n    if (type == WebChannelBase.ChannelType_.BACK_CHANNEL) {\n      if (this.maybeRetryBackChannel_()) {\n        return;\n      }\n    }\n    // Else exceeded max retries. Fall through.\n    this.channelDebug_.debug('Exceeded max number of retries');\n  } else {\n    // Else fatal error. Fall through and mark the pending maps as failed.\n    this.channelDebug_.debug('Not retrying due to error type');\n  }\n\n\n  // Abort the channel now\n\n  // Record pending messages from the failed request\n  if (pendingMessages && pendingMessages.length > 0) {\n    this.forwardChannelRequestPool_.addPendingMessages(pendingMessages);\n  }\n\n  this.channelDebug_.debug('Error: HTTP request failed');\n  switch (lastError) {\n    case ChannelRequest.Error.NO_DATA:\n      this.signalError_(WebChannelBase.Error.NO_DATA);\n      break;\n    case ChannelRequest.Error.BAD_DATA:\n      this.signalError_(WebChannelBase.Error.BAD_DATA);\n      break;\n    case ChannelRequest.Error.UNKNOWN_SESSION_ID:\n      this.signalError_(WebChannelBase.Error.UNKNOWN_SESSION_ID);\n      break;\n    default:\n      this.signalError_(WebChannelBase.Error.REQUEST_FAILED);\n      break;\n  }\n};\n\n\n/**\n * @param {number} retryCount Number of retries so far.\n * @return {number} Time in ms before firing next retry request.\n * @private\n */\nWebChannelBase.prototype.getRetryTime_ = function(retryCount) {\n  var retryTime = this.baseRetryDelayMs_ +\n      Math.floor(Math.random() * this.retryDelaySeedMs_);\n  if (!this.isActive()) {\n    this.channelDebug_.debug('Inactive channel');\n    retryTime = retryTime * WebChannelBase.INACTIVE_CHANNEL_RETRY_FACTOR;\n  }\n  // Backoff for subsequent retries\n  retryTime *= retryCount;\n  return retryTime;\n};\n\n\n/**\n * @param {number} baseDelayMs The base part of the retry delay, in ms.\n * @param {number} delaySeedMs A random delay between 0 and this is added to\n *     the base part.\n */\nWebChannelBase.prototype.setRetryDelay = function(baseDelayMs, delaySeedMs) {\n  this.baseRetryDelayMs_ = baseDelayMs;\n  this.retryDelaySeedMs_ = delaySeedMs;\n};\n\n\n/**\n * Apply any handshake control headers.\n * @param {!ChannelRequest} request The underlying request object\n * @private\n */\nWebChannelBase.prototype.applyControlHeaders_ = function(request) {\n  var xhr = request.getXhr();\n  if (xhr) {\n    var clientProtocol =\n        xhr.getStreamingResponseHeader(WebChannel.X_CLIENT_WIRE_PROTOCOL);\n    if (clientProtocol) {\n      this.forwardChannelRequestPool_.applyClientProtocol(clientProtocol);\n    }\n\n    if (this.getHttpSessionIdParam()) {\n      var httpSessionIdHeader =\n          xhr.getStreamingResponseHeader(WebChannel.X_HTTP_SESSION_ID);\n      if (httpSessionIdHeader) {\n        this.setHttpSessionId(httpSessionIdHeader);\n        // update the cached uri\n        var httpSessionIdParam = this.getHttpSessionIdParam();\n\n        this.forwardChannelUri_.setParameterValue(\n            /** @type {string} */ (httpSessionIdParam),  // never null\n            httpSessionIdHeader);\n      } else {\n        this.channelDebug_.warning(\n            'Missing X_HTTP_SESSION_ID in the handshake response');\n      }\n    }\n  }\n};\n\n\n/**\n * Processes the data returned by the server.\n * @param {!Array<!Array<?>>} respArray The response array returned\n *     by the server.\n * @param {!ChannelRequest} request The underlying request object\n * @private\n */\nWebChannelBase.prototype.onInput_ = function(respArray, request) {\n  var batch =\n      this.handler_ && this.handler_.channelHandleMultipleArrays ? [] : null;\n  for (var i = 0; i < respArray.length; i++) {\n    var nextArray = respArray[i];\n    this.lastArrayId_ = nextArray[0];\n    nextArray = nextArray[1];\n    if (this.state_ == WebChannelBase.State.OPENING) {\n      if (nextArray[0] == 'c') {\n        this.sid_ = nextArray[1];\n        this.hostPrefix_ = this.correctHostPrefix(nextArray[2]);\n\n        var negotiatedVersion = nextArray[3];\n        if (negotiatedVersion != null) {\n          this.channelVersion_ = negotiatedVersion;\n          this.channelDebug_.info('VER=' + this.channelVersion_);\n        }\n\n        var negotiatedServerVersion = nextArray[4];\n        if (negotiatedServerVersion != null) {\n          this.serverVersion_ = negotiatedServerVersion;\n          this.channelDebug_.info('SVER=' + this.serverVersion_);\n        }\n\n        // CVER=22\n        var serverKeepaliveMs = nextArray[5];\n        if (serverKeepaliveMs != null &&\n            typeof serverKeepaliveMs === 'number' && serverKeepaliveMs > 0) {\n          var timeout = 1.5 * serverKeepaliveMs;\n          this.backChannelRequestTimeoutMs_ = timeout;\n          this.channelDebug_.info('backChannelRequestTimeoutMs_=' + timeout);\n        }\n\n        this.applyControlHeaders_(request);\n\n        this.state_ = WebChannelBase.State.OPENED;\n        if (this.handler_) {\n          this.handler_.channelOpened(this);\n        }\n\n        this.startBackchannelAfterHandshake_(request);\n\n        if (this.outgoingMaps_.length > 0) {\n          this.ensureForwardChannel_();\n        }\n      } else if (nextArray[0] == 'stop' || nextArray[0] == 'close') {\n        // treat close also as an abort\n        this.signalError_(WebChannelBase.Error.STOP);\n      }\n    } else if (this.state_ == WebChannelBase.State.OPENED) {\n      if (nextArray[0] == 'stop' || nextArray[0] == 'close') {\n        if (batch && !goog.array.isEmpty(batch)) {\n          this.handler_.channelHandleMultipleArrays(this, batch);\n          batch.length = 0;\n        }\n        if (nextArray[0] == 'stop') {\n          this.signalError_(WebChannelBase.Error.STOP);\n        } else {\n          this.disconnect();\n        }\n      } else if (nextArray[0] == 'noop') {\n        // ignore - noop to keep connection happy\n      } else {\n        if (batch) {\n          batch.push(nextArray);\n        } else if (this.handler_) {\n          this.handler_.channelHandleArray(this, nextArray);\n        }\n      }\n      // We have received useful data on the back-channel, so clear its retry\n      // count. We do this because back-channels by design do not complete\n      // quickly, so on a flaky connection we could have many fail to complete\n      // fully but still deliver a lot of data before they fail. We don't want\n      // to count such failures towards the retry limit, because we don't want\n      // to give up on a session if we can still receive data.\n      this.backChannelRetryCount_ = 0;\n    }\n  }\n  if (batch && !goog.array.isEmpty(batch)) {\n    this.handler_.channelHandleMultipleArrays(this, batch);\n  }\n};\n\n\n/**\n * Starts the backchannel after the handshake.\n *\n * @param {!ChannelRequest} request The underlying request object\n * @private\n */\nWebChannelBase.prototype.startBackchannelAfterHandshake_ = function(request) {\n  this.backChannelUri_ = this.getBackChannelUri(\n      this.hostPrefix_, /** @type {string} */ (this.path_));\n\n  if (request.isInitialResponseDecoded()) {\n    this.channelDebug_.debug('Upgrade the handshake request to a backchannel.');\n    this.forwardChannelRequestPool_.removeRequest(request);\n    request.resetTimeout(this.backChannelRequestTimeoutMs_);\n    this.backChannelRequest_ = request;\n  } else {\n    // Open connection to receive data\n    this.ensureBackChannel_();\n  }\n};\n\n\n/**\n * Helper to ensure the channel is in the expected state.\n * @param {...number} var_args The channel must be in one of the indicated\n *     states.\n * @private\n */\nWebChannelBase.prototype.ensureInState_ = function(var_args) {\n  goog.asserts.assert(\n      goog.array.contains(arguments, this.state_),\n      'Unexpected channel state: %s', this.state_);\n};\n\n\n/**\n * Signals an error has occurred.\n * @param {WebChannelBase.Error} error The error code for the failure.\n * @private\n */\nWebChannelBase.prototype.signalError_ = function(error) {\n  this.channelDebug_.info('Error code ' + error);\n  if (error == WebChannelBase.Error.REQUEST_FAILED) {\n    // Create a separate Internet connection to check\n    // if it's a server error or user's network error.\n    var imageUri = null;\n    if (this.handler_) {\n      imageUri = this.handler_.getNetworkTestImageUri(this);\n    }\n    netUtils.testNetwork(goog.bind(this.testNetworkCallback_, this), imageUri);\n  } else {\n    requestStats.notifyStatEvent(requestStats.Stat.ERROR_OTHER);\n  }\n  this.onError_(error);\n};\n\n\n/**\n * Callback for netUtils.testNetwork during error handling.\n * @param {boolean} networkUp Whether the network is up.\n * @private\n */\nWebChannelBase.prototype.testNetworkCallback_ = function(networkUp) {\n  if (networkUp) {\n    this.channelDebug_.info('Successfully pinged google.com');\n    requestStats.notifyStatEvent(requestStats.Stat.ERROR_OTHER);\n  } else {\n    this.channelDebug_.info('Failed to ping google.com');\n    requestStats.notifyStatEvent(requestStats.Stat.ERROR_NETWORK);\n    // Do not call onError_ again to eliminate duplicated Error events.\n  }\n};\n\n\n/**\n * Called when messages have been successfully sent from the queue.\n * @param {!ChannelRequest} request The request object\n * @private\n */\nWebChannelBase.prototype.onSuccess_ = function(request) {\n  if (this.handler_) {\n    this.handler_.channelSuccess(this, request);\n  }\n};\n\n\n/**\n * Called when we've determined the final error for a channel. It closes the\n * notifiers the handler of the error and closes the channel.\n * @param {WebChannelBase.Error} error  The error code for the failure.\n * @private\n */\nWebChannelBase.prototype.onError_ = function(error) {\n  this.channelDebug_.debug('HttpChannel: error - ' + error);\n  this.state_ = WebChannelBase.State.CLOSED;\n  if (this.handler_) {\n    this.handler_.channelError(this, error);\n  }\n  this.onClose_();\n  this.cancelRequests_();\n};\n\n\n/**\n * Called when the channel has been closed. It notifiers the handler of the\n * event, and reports any pending or undelivered maps.\n * @private\n */\nWebChannelBase.prototype.onClose_ = function() {\n  this.state_ = WebChannelBase.State.CLOSED;\n  this.lastStatusCode_ = -1;\n  if (this.handler_) {\n    var pendingMessages = this.forwardChannelRequestPool_.getPendingMessages();\n\n    if (pendingMessages.length == 0 && this.outgoingMaps_.length == 0) {\n      this.handler_.channelClosed(this);\n    } else {\n      var self = this;\n      this.channelDebug_.debug(function() {\n        return 'Number of undelivered maps' +\n            ', pending: ' + pendingMessages.length +\n            ', outgoing: ' + self.outgoingMaps_.length;\n      });\n\n      this.forwardChannelRequestPool_.clearPendingMessages();\n\n      var copyOfUndeliveredMaps = goog.array.clone(this.outgoingMaps_);\n      this.outgoingMaps_.length = 0;\n\n      this.handler_.channelClosed(this, pendingMessages, copyOfUndeliveredMaps);\n    }\n  }\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.getForwardChannelUri = function(path) {\n  var uri = this.createDataUri(null, path);\n  this.channelDebug_.debug('GetForwardChannelUri: ' + uri);\n  return uri;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.getConnectionState = function() {\n  return this.connState_;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.getBackChannelUri = function(hostPrefix, path) {\n  var uri = this.createDataUri(\n      this.shouldUseSecondaryDomains() ? hostPrefix : null, path);\n  this.channelDebug_.debug('GetBackChannelUri: ' + uri);\n  return uri;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.createDataUri = function(\n    hostPrefix, path, opt_overridePort) {\n  var uri = goog.Uri.parse(path);\n  var uriAbsolute = (uri.getDomain() != '');\n  if (uriAbsolute) {\n    if (hostPrefix) {\n      uri.setDomain(hostPrefix + '.' + uri.getDomain());\n    }\n\n    uri.setPort(opt_overridePort || uri.getPort());\n  } else {\n    var locationPage = goog.global.location;\n    var hostName;\n    if (hostPrefix) {\n      hostName = hostPrefix + '.' + locationPage.hostname;\n    } else {\n      hostName = locationPage.hostname;\n    }\n\n    var port = opt_overridePort || +locationPage.port;\n\n    uri = goog.Uri.create(locationPage.protocol, null, hostName, port, path);\n  }\n\n  if (this.extraParams_) {\n    goog.object.forEach(this.extraParams_, function(value, key) {\n      uri.setParameterValue(key, value);\n    });\n  }\n\n  var param = this.getHttpSessionIdParam();\n  var value = this.getHttpSessionId();\n  if (param && value) {\n    uri.setParameterValue(param, value);\n  }\n\n  // Add the protocol version to the URI.\n  uri.setParameterValue('VER', this.channelVersion_);\n\n  // Add the reconnect parameters.\n  this.addAdditionalParams_(uri);\n\n  return uri;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.createXhrIo = function(hostPrefix) {\n  if (hostPrefix && !this.supportsCrossDomainXhrs_) {\n    throw new Error('Can\\'t create secondary domain capable XhrIo object.');\n  }\n  var xhr = new goog.net.XhrIo(this.xmlHttpFactory_);\n  xhr.setWithCredentials(this.supportsCrossDomainXhrs_);\n  return xhr;\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.isActive = function() {\n  return !!this.handler_ && this.handler_.isActive(this);\n};\n\n\n/**\n * @override\n */\nWebChannelBase.prototype.shouldUseSecondaryDomains = function() {\n  return this.supportsCrossDomainXhrs_;\n};\n\n\n/**\n * Sets (overwrites) the forward channel flush callback.\n *\n * @param {function()} callback The callback to be invoked.\n */\nWebChannelBase.prototype.setForwardChannelFlushCallback = function(callback) {\n  this.forwardChannelFlushedCallback_ = callback;\n};\n\n\n/**\n * Abstract base class for the channel handler\n * @constructor\n * @struct\n */\nWebChannelBase.Handler = function() {};\n\n\n/**\n * Callback handler for when a batch of response arrays is received from the\n * server. When null, batched dispatching is disabled.\n * @type {?function(!WebChannelBase, !Array<!Array<?>>)}\n */\nWebChannelBase.Handler.prototype.channelHandleMultipleArrays = null;\n\n\n/**\n * Whether it's okay to make a request to the server. A handler can return\n * false if the channel should fail. For example, if the user has logged out,\n * the handler may want all requests to fail immediately.\n * @param {WebChannelBase} channel The channel.\n * @return {WebChannelBase.Error} An error code. The code should\n * return WebChannelBase.Error.OK to indicate it's okay. Any other\n * error code will cause a failure.\n */\nWebChannelBase.Handler.prototype.okToMakeRequest = function(channel) {\n  return WebChannelBase.Error.OK;\n};\n\n\n/**\n * Indicates the WebChannel has successfully negotiated with the server\n * and can now send and receive data.\n * @param {WebChannelBase} channel The channel.\n */\nWebChannelBase.Handler.prototype.channelOpened = function(channel) {};\n\n\n/**\n * New input is available for the application to process.\n *\n * @param {WebChannelBase} channel The channel.\n * @param {Array<?>} array The data array.\n */\nWebChannelBase.Handler.prototype.channelHandleArray = function(\n    channel, array) {};\n\n\n/**\n * Indicates messages that have been successfully sent on the channel.\n *\n * @param {WebChannelBase} channel The channel.\n * @param {!ChannelRequest} request The request object that contains\n *     the pending messages that have been successfully delivered to the server.\n */\nWebChannelBase.Handler.prototype.channelSuccess = function(channel, request) {};\n\n\n/**\n * Indicates an error occurred on the WebChannel.\n *\n * @param {WebChannelBase} channel The channel.\n * @param {WebChannelBase.Error} error The error code.\n */\nWebChannelBase.Handler.prototype.channelError = function(channel, error) {};\n\n\n/**\n * Indicates the WebChannel is closed. Also notifies about which maps,\n * if any, that may not have been delivered to the server.\n * @param {WebChannelBase} channel The channel.\n * @param {Array<Wire.QueuedMap>=} opt_pendingMaps The\n *     array of pending maps, which may or may not have been delivered to the\n *     server.\n * @param {Array<Wire.QueuedMap>=} opt_undeliveredMaps\n *     The array of undelivered maps, which have definitely not been delivered\n *     to the server.\n */\nWebChannelBase.Handler.prototype.channelClosed = function(\n    channel, opt_pendingMaps, opt_undeliveredMaps) {};\n\n\n/**\n * Gets any parameters that should be added at the time another connection is\n * made to the server.\n * @param {WebChannelBase} channel The channel.\n * @return {!Object} Extra parameter keys and values to add to the requests.\n */\nWebChannelBase.Handler.prototype.getAdditionalParams = function(channel) {\n  return {};\n};\n\n\n/**\n * Gets the URI of an image that can be used to test network connectivity.\n * @param {WebChannelBase} channel The channel.\n * @return {goog.Uri?} A custom URI to load for the network test.\n */\nWebChannelBase.Handler.prototype.getNetworkTestImageUri = function(channel) {\n  return null;\n};\n\n\n/**\n * Gets whether this channel is currently active. This is used to determine the\n * length of time to wait before retrying.\n * @param {WebChannelBase} channel The channel.\n * @return {boolean} Whether the channel is currently active.\n */\nWebChannelBase.Handler.prototype.isActive = function(channel) {\n  return true;\n};\n\n\n/**\n * Called by the channel if enumeration of the map throws an exception.\n * @param {WebChannelBase} channel The channel.\n * @param {Object} map The map that can't be enumerated.\n */\nWebChannelBase.Handler.prototype.badMapError = function(channel, map) {};\n\n\n/**\n * Allows the handler to override a host prefix provided by the server. Will\n * be called whenever the channel has received such a prefix and is considering\n * its use.\n * @param {?string} serverHostPrefix The host prefix provided by the server.\n * @return {?string} The host prefix the client should use.\n */\nWebChannelBase.Handler.prototype.correctHostPrefix = function(\n    serverHostPrefix) {\n  return serverHostPrefix;\n};\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Class for parsing and formatting URIs.\n *\n * Use goog.Uri(string) to parse a URI string.  Use goog.Uri.create(...) to\n * create a new instance of the goog.Uri object from Uri parts.\n *\n * e.g: <code>var myUri = new goog.Uri(window.location);</code>\n *\n * Implements RFC 3986 for parsing/formatting URIs.\n * http://www.ietf.org/rfc/rfc3986.txt\n *\n * Some changes have been made to the interface (more like .NETs), though the\n * internal representation is now of un-encoded parts, this will change the\n * behavior slightly.\n */\n\ngoog.provide('goog.Uri');\ngoog.provide('goog.Uri.QueryData');\n\ngoog.require('goog.array');\ngoog.require('goog.asserts');\ngoog.require('goog.string');\ngoog.require('goog.structs');\ngoog.require('goog.structs.Map');\ngoog.require('goog.uri.utils');\ngoog.require('goog.uri.utils.ComponentIndex');\ngoog.require('goog.uri.utils.StandardQueryParam');\n\n\n\n/**\n * This class contains setters and getters for the parts of the URI.\n * The <code>getXyz</code>/<code>setXyz</code> methods return the decoded part\n * -- so<code>goog.Uri.parse('/foo%20bar').getPath()</code> will return the\n * decoded path, <code>/foo bar</code>.\n *\n * Reserved characters (see RFC 3986 section 2.2) can be present in\n * their percent-encoded form in scheme, domain, and path URI components and\n * will not be auto-decoded. For example:\n * <code>goog.Uri.parse('rel%61tive/path%2fto/resource').getPath()</code> will\n * return <code>relative/path%2fto/resource</code>.\n *\n * The constructor accepts an optional unparsed, raw URI string.  The parser\n * is relaxed, so special characters that aren't escaped but don't cause\n * ambiguities will not cause parse failures.\n *\n * All setters return <code>this</code> and so may be chained, a la\n * <code>goog.Uri.parse('/foo').setFragment('part').toString()</code>.\n *\n * @param {*=} opt_uri Optional string URI to parse\n *        (use goog.Uri.create() to create a URI from parts), or if\n *        a goog.Uri is passed, a clone is created.\n * @param {boolean=} opt_ignoreCase If true, #getParameterValue will ignore\n * the case of the parameter name.\n *\n * @throws URIError If opt_uri is provided and URI is malformed (that is,\n *     if decodeURIComponent fails on any of the URI components).\n * @constructor\n * @struct\n */\ngoog.Uri = function(opt_uri, opt_ignoreCase) {\n  /**\n   * Scheme such as \"http\".\n   * @private {string}\n   */\n  this.scheme_ = '';\n\n  /**\n   * User credentials in the form \"username:password\".\n   * @private {string}\n   */\n  this.userInfo_ = '';\n\n  /**\n   * Domain part, e.g. \"www.google.com\".\n   * @private {string}\n   */\n  this.domain_ = '';\n\n  /**\n   * Port, e.g. 8080.\n   * @private {?number}\n   */\n  this.port_ = null;\n\n  /**\n   * Path, e.g. \"/tests/img.png\".\n   * @private {string}\n   */\n  this.path_ = '';\n\n  /**\n   * The fragment without the #.\n   * @private {string}\n   */\n  this.fragment_ = '';\n\n  /**\n   * Whether or not this Uri should be treated as Read Only.\n   * @private {boolean}\n   */\n  this.isReadOnly_ = false;\n\n  /**\n   * Whether or not to ignore case when comparing query params.\n   * @private {boolean}\n   */\n  this.ignoreCase_ = false;\n\n  /**\n   * Object representing query data.\n   * @private {!goog.Uri.QueryData}\n   */\n  this.queryData_;\n\n  // Parse in the uri string\n  var m;\n  if (opt_uri instanceof goog.Uri) {\n    this.ignoreCase_ = (opt_ignoreCase !== undefined) ? opt_ignoreCase :\n                                                        opt_uri.getIgnoreCase();\n    this.setScheme(opt_uri.getScheme());\n    this.setUserInfo(opt_uri.getUserInfo());\n    this.setDomain(opt_uri.getDomain());\n    this.setPort(opt_uri.getPort());\n    this.setPath(opt_uri.getPath());\n    this.setQueryData(opt_uri.getQueryData().clone());\n    this.setFragment(opt_uri.getFragment());\n  } else if (opt_uri && (m = goog.uri.utils.split(String(opt_uri)))) {\n    this.ignoreCase_ = !!opt_ignoreCase;\n\n    // Set the parts -- decoding as we do so.\n    // COMPATIBILITY NOTE - In IE, unmatched fields may be empty strings,\n    // whereas in other browsers they will be undefined.\n    this.setScheme(m[goog.uri.utils.ComponentIndex.SCHEME] || '', true);\n    this.setUserInfo(m[goog.uri.utils.ComponentIndex.USER_INFO] || '', true);\n    this.setDomain(m[goog.uri.utils.ComponentIndex.DOMAIN] || '', true);\n    this.setPort(m[goog.uri.utils.ComponentIndex.PORT]);\n    this.setPath(m[goog.uri.utils.ComponentIndex.PATH] || '', true);\n    this.setQueryData(m[goog.uri.utils.ComponentIndex.QUERY_DATA] || '', true);\n    this.setFragment(m[goog.uri.utils.ComponentIndex.FRAGMENT] || '', true);\n\n  } else {\n    this.ignoreCase_ = !!opt_ignoreCase;\n    this.queryData_ = new goog.Uri.QueryData(null, this.ignoreCase_);\n  }\n};\n\n\n/**\n * Parameter name added to stop caching.\n * @type {string}\n */\ngoog.Uri.RANDOM_PARAM = goog.uri.utils.StandardQueryParam.RANDOM;\n\n\n/**\n * @return {string} The string form of the url.\n * @override\n */\ngoog.Uri.prototype.toString = function() {\n  var out = [];\n\n  var scheme = this.getScheme();\n  if (scheme) {\n    out.push(\n        goog.Uri.encodeSpecialChars_(\n            scheme, goog.Uri.reDisallowedInSchemeOrUserInfo_, true),\n        ':');\n  }\n\n  var domain = this.getDomain();\n  if (domain || scheme == 'file') {\n    out.push('//');\n\n    var userInfo = this.getUserInfo();\n    if (userInfo) {\n      out.push(\n          goog.Uri.encodeSpecialChars_(\n              userInfo, goog.Uri.reDisallowedInSchemeOrUserInfo_, true),\n          '@');\n    }\n\n    out.push(goog.Uri.removeDoubleEncoding_(goog.string.urlEncode(domain)));\n\n    var port = this.getPort();\n    if (port != null) {\n      out.push(':', String(port));\n    }\n  }\n\n  var path = this.getPath();\n  if (path) {\n    if (this.hasDomain() && path.charAt(0) != '/') {\n      out.push('/');\n    }\n    out.push(goog.Uri.encodeSpecialChars_(\n        path,\n        path.charAt(0) == '/' ? goog.Uri.reDisallowedInAbsolutePath_ :\n                                goog.Uri.reDisallowedInRelativePath_,\n        true));\n  }\n\n  var query = this.getEncodedQuery();\n  if (query) {\n    out.push('?', query);\n  }\n\n  var fragment = this.getFragment();\n  if (fragment) {\n    out.push(\n        '#',\n        goog.Uri.encodeSpecialChars_(\n            fragment, goog.Uri.reDisallowedInFragment_));\n  }\n  return out.join('');\n};\n\n\n/**\n * Resolves the given relative URI (a goog.Uri object), using the URI\n * represented by this instance as the base URI.\n *\n * There are several kinds of relative URIs:<br>\n * 1. foo - replaces the last part of the path, the whole query and fragment<br>\n * 2. /foo - replaces the path, the query and fragment<br>\n * 3. //foo - replaces everything from the domain on.  foo is a domain name<br>\n * 4. ?foo - replace the query and fragment<br>\n * 5. #foo - replace the fragment only\n *\n * Additionally, if relative URI has a non-empty path, all \"..\" and \".\"\n * segments will be resolved, as described in RFC 3986.\n *\n * @param {!goog.Uri} relativeUri The relative URI to resolve.\n * @return {!goog.Uri} The resolved URI.\n */\ngoog.Uri.prototype.resolve = function(relativeUri) {\n  var absoluteUri = this.clone();\n\n  // we satisfy these conditions by looking for the first part of relativeUri\n  // that is not blank and applying defaults to the rest\n\n  var overridden = relativeUri.hasScheme();\n\n  if (overridden) {\n    absoluteUri.setScheme(relativeUri.getScheme());\n  } else {\n    overridden = relativeUri.hasUserInfo();\n  }\n\n  if (overridden) {\n    absoluteUri.setUserInfo(relativeUri.getUserInfo());\n  } else {\n    overridden = relativeUri.hasDomain();\n  }\n\n  if (overridden) {\n    absoluteUri.setDomain(relativeUri.getDomain());\n  } else {\n    overridden = relativeUri.hasPort();\n  }\n\n  var path = relativeUri.getPath();\n  if (overridden) {\n    absoluteUri.setPort(relativeUri.getPort());\n  } else {\n    overridden = relativeUri.hasPath();\n    if (overridden) {\n      // resolve path properly\n      if (path.charAt(0) != '/') {\n        // path is relative\n        if (this.hasDomain() && !this.hasPath()) {\n          // RFC 3986, section 5.2.3, case 1\n          path = '/' + path;\n        } else {\n          // RFC 3986, section 5.2.3, case 2\n          var lastSlashIndex = absoluteUri.getPath().lastIndexOf('/');\n          if (lastSlashIndex != -1) {\n            path = absoluteUri.getPath().substr(0, lastSlashIndex + 1) + path;\n          }\n        }\n      }\n      path = goog.Uri.removeDotSegments(path);\n    }\n  }\n\n  if (overridden) {\n    absoluteUri.setPath(path);\n  } else {\n    overridden = relativeUri.hasQuery();\n  }\n\n  if (overridden) {\n    absoluteUri.setQueryData(relativeUri.getQueryData().clone());\n  } else {\n    overridden = relativeUri.hasFragment();\n  }\n\n  if (overridden) {\n    absoluteUri.setFragment(relativeUri.getFragment());\n  }\n\n  return absoluteUri;\n};\n\n\n/**\n * Clones the URI instance.\n * @return {!goog.Uri} New instance of the URI object.\n */\ngoog.Uri.prototype.clone = function() {\n  return new goog.Uri(this);\n};\n\n\n/**\n * @return {string} The encoded scheme/protocol for the URI.\n */\ngoog.Uri.prototype.getScheme = function() {\n  return this.scheme_;\n};\n\n\n/**\n * Sets the scheme/protocol.\n * @throws URIError If opt_decode is true and newScheme is malformed (that is,\n *     if decodeURIComponent fails).\n * @param {string} newScheme New scheme value.\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setScheme = function(newScheme, opt_decode) {\n  this.enforceReadOnly();\n  this.scheme_ =\n      opt_decode ? goog.Uri.decodeOrEmpty_(newScheme, true) : newScheme;\n\n  // remove an : at the end of the scheme so somebody can pass in\n  // window.location.protocol\n  if (this.scheme_) {\n    this.scheme_ = this.scheme_.replace(/:$/, '');\n  }\n  return this;\n};\n\n\n/**\n * @return {boolean} Whether the scheme has been set.\n */\ngoog.Uri.prototype.hasScheme = function() {\n  return !!this.scheme_;\n};\n\n\n/**\n * @return {string} The decoded user info.\n */\ngoog.Uri.prototype.getUserInfo = function() {\n  return this.userInfo_;\n};\n\n\n/**\n * Sets the userInfo.\n * @throws URIError If opt_decode is true and newUserInfo is malformed (that is,\n *     if decodeURIComponent fails).\n * @param {string} newUserInfo New userInfo value.\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setUserInfo = function(newUserInfo, opt_decode) {\n  this.enforceReadOnly();\n  this.userInfo_ =\n      opt_decode ? goog.Uri.decodeOrEmpty_(newUserInfo) : newUserInfo;\n  return this;\n};\n\n\n/**\n * @return {boolean} Whether the user info has been set.\n */\ngoog.Uri.prototype.hasUserInfo = function() {\n  return !!this.userInfo_;\n};\n\n\n/**\n * @return {string} The decoded domain.\n */\ngoog.Uri.prototype.getDomain = function() {\n  return this.domain_;\n};\n\n\n/**\n * Sets the domain.\n * @throws URIError If opt_decode is true and newDomain is malformed (that is,\n *     if decodeURIComponent fails).\n * @param {string} newDomain New domain value.\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setDomain = function(newDomain, opt_decode) {\n  this.enforceReadOnly();\n  this.domain_ =\n      opt_decode ? goog.Uri.decodeOrEmpty_(newDomain, true) : newDomain;\n  return this;\n};\n\n\n/**\n * @return {boolean} Whether the domain has been set.\n */\ngoog.Uri.prototype.hasDomain = function() {\n  return !!this.domain_;\n};\n\n\n/**\n * @return {?number} The port number.\n */\ngoog.Uri.prototype.getPort = function() {\n  return this.port_;\n};\n\n\n/**\n * Sets the port number.\n * @param {*} newPort Port number. Will be explicitly casted to a number.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setPort = function(newPort) {\n  this.enforceReadOnly();\n\n  if (newPort) {\n    newPort = Number(newPort);\n    if (isNaN(newPort) || newPort < 0) {\n      throw new Error('Bad port number ' + newPort);\n    }\n    this.port_ = newPort;\n  } else {\n    this.port_ = null;\n  }\n\n  return this;\n};\n\n\n/**\n * @return {boolean} Whether the port has been set.\n */\ngoog.Uri.prototype.hasPort = function() {\n  return this.port_ != null;\n};\n\n\n/**\n * @return {string} The decoded path.\n */\ngoog.Uri.prototype.getPath = function() {\n  return this.path_;\n};\n\n\n/**\n * Sets the path.\n * @throws URIError If opt_decode is true and newPath is malformed (that is,\n *     if decodeURIComponent fails).\n * @param {string} newPath New path value.\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setPath = function(newPath, opt_decode) {\n  this.enforceReadOnly();\n  this.path_ = opt_decode ? goog.Uri.decodeOrEmpty_(newPath, true) : newPath;\n  return this;\n};\n\n\n/**\n * @return {boolean} Whether the path has been set.\n */\ngoog.Uri.prototype.hasPath = function() {\n  return !!this.path_;\n};\n\n\n/**\n * @return {boolean} Whether the query string has been set.\n */\ngoog.Uri.prototype.hasQuery = function() {\n  return this.queryData_.toString() !== '';\n};\n\n\n/**\n * Sets the query data.\n * @param {goog.Uri.QueryData|string|undefined} queryData QueryData object.\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\n *     Applies only if queryData is a string.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setQueryData = function(queryData, opt_decode) {\n  this.enforceReadOnly();\n\n  if (queryData instanceof goog.Uri.QueryData) {\n    this.queryData_ = queryData;\n    this.queryData_.setIgnoreCase(this.ignoreCase_);\n  } else {\n    if (!opt_decode) {\n      // QueryData accepts encoded query string, so encode it if\n      // opt_decode flag is not true.\n      queryData = goog.Uri.encodeSpecialChars_(\n          queryData, goog.Uri.reDisallowedInQuery_);\n    }\n    this.queryData_ = new goog.Uri.QueryData(queryData, this.ignoreCase_);\n  }\n\n  return this;\n};\n\n\n/**\n * Sets the URI query.\n * @param {string} newQuery New query value.\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setQuery = function(newQuery, opt_decode) {\n  return this.setQueryData(newQuery, opt_decode);\n};\n\n\n/**\n * @return {string} The encoded URI query, not including the ?.\n */\ngoog.Uri.prototype.getEncodedQuery = function() {\n  return this.queryData_.toString();\n};\n\n\n/**\n * @return {string} The decoded URI query, not including the ?.\n */\ngoog.Uri.prototype.getDecodedQuery = function() {\n  return this.queryData_.toDecodedString();\n};\n\n\n/**\n * Returns the query data.\n * @return {!goog.Uri.QueryData} QueryData object.\n */\ngoog.Uri.prototype.getQueryData = function() {\n  return this.queryData_;\n};\n\n\n/**\n * @return {string} The encoded URI query, not including the ?.\n *\n * Warning: This method, unlike other getter methods, returns encoded\n * value, instead of decoded one.\n */\ngoog.Uri.prototype.getQuery = function() {\n  return this.getEncodedQuery();\n};\n\n\n/**\n * Sets the value of the named query parameters, clearing previous values for\n * that key.\n *\n * @param {string} key The parameter to set.\n * @param {*} value The new value. Value does not need to be encoded.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setParameterValue = function(key, value) {\n  this.enforceReadOnly();\n  this.queryData_.set(key, value);\n  return this;\n};\n\n\n/**\n * Sets the values of the named query parameters, clearing previous values for\n * that key.  Not new values will currently be moved to the end of the query\n * string.\n *\n * So, <code>goog.Uri.parse('foo?a=b&c=d&e=f').setParameterValues('c', ['new'])\n * </code> yields <tt>foo?a=b&e=f&c=new</tt>.</p>\n *\n * @param {string} key The parameter to set.\n * @param {*} values The new values. If values is a single\n *     string then it will be treated as the sole value. Values do not need to\n *     be encoded.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setParameterValues = function(key, values) {\n  this.enforceReadOnly();\n\n  if (!Array.isArray(values)) {\n    values = [String(values)];\n  }\n\n  this.queryData_.setValues(key, values);\n\n  return this;\n};\n\n\n/**\n * Returns the value<b>s</b> for a given cgi parameter as a list of decoded\n * query parameter values.\n * @param {string} name The parameter to get values for.\n * @return {!Array<?>} The values for a given cgi parameter as a list of\n *     decoded query parameter values.\n */\ngoog.Uri.prototype.getParameterValues = function(name) {\n  return this.queryData_.getValues(name);\n};\n\n\n/**\n * Returns the first value for a given cgi parameter or undefined if the given\n * parameter name does not appear in the query string.\n * @param {string} paramName Unescaped parameter name.\n * @return {string|undefined} The first value for a given cgi parameter or\n *     undefined if the given parameter name does not appear in the query\n *     string.\n */\ngoog.Uri.prototype.getParameterValue = function(paramName) {\n  return /** @type {string|undefined} */ (this.queryData_.get(paramName));\n};\n\n\n/**\n * @return {string} The URI fragment, not including the #.\n */\ngoog.Uri.prototype.getFragment = function() {\n  return this.fragment_;\n};\n\n\n/**\n * Sets the URI fragment.\n * @throws URIError If opt_decode is true and newFragment is malformed (that is,\n *     if decodeURIComponent fails).\n * @param {string} newFragment New fragment value.\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.setFragment = function(newFragment, opt_decode) {\n  this.enforceReadOnly();\n  this.fragment_ =\n      opt_decode ? goog.Uri.decodeOrEmpty_(newFragment) : newFragment;\n  return this;\n};\n\n\n/**\n * @return {boolean} Whether the URI has a fragment set.\n */\ngoog.Uri.prototype.hasFragment = function() {\n  return !!this.fragment_;\n};\n\n\n/**\n * Returns true if this has the same domain as that of uri2.\n * @param {!goog.Uri} uri2 The URI object to compare to.\n * @return {boolean} true if same domain; false otherwise.\n */\ngoog.Uri.prototype.hasSameDomainAs = function(uri2) {\n  return ((!this.hasDomain() && !uri2.hasDomain()) ||\n          this.getDomain() == uri2.getDomain()) &&\n      ((!this.hasPort() && !uri2.hasPort()) ||\n       this.getPort() == uri2.getPort());\n};\n\n\n/**\n * Adds a random parameter to the Uri.\n * @return {!goog.Uri} Reference to this Uri object.\n */\ngoog.Uri.prototype.makeUnique = function() {\n  this.enforceReadOnly();\n  this.setParameterValue(goog.Uri.RANDOM_PARAM, goog.string.getRandomString());\n\n  return this;\n};\n\n\n/**\n * Removes the named query parameter.\n *\n * @param {string} key The parameter to remove.\n * @return {!goog.Uri} Reference to this URI object.\n */\ngoog.Uri.prototype.removeParameter = function(key) {\n  this.enforceReadOnly();\n  this.queryData_.remove(key);\n  return this;\n};\n\n\n/**\n * Sets whether Uri is read only. If this goog.Uri is read-only,\n * enforceReadOnly_ will be called at the start of any function that may modify\n * this Uri.\n * @param {boolean} isReadOnly whether this goog.Uri should be read only.\n * @return {!goog.Uri} Reference to this Uri object.\n */\ngoog.Uri.prototype.setReadOnly = function(isReadOnly) {\n  this.isReadOnly_ = isReadOnly;\n  return this;\n};\n\n\n/**\n * @return {boolean} Whether the URI is read only.\n */\ngoog.Uri.prototype.isReadOnly = function() {\n  return this.isReadOnly_;\n};\n\n\n/**\n * Checks if this Uri has been marked as read only, and if so, throws an error.\n * This should be called whenever any modifying function is called.\n */\ngoog.Uri.prototype.enforceReadOnly = function() {\n  if (this.isReadOnly_) {\n    throw new Error('Tried to modify a read-only Uri');\n  }\n};\n\n\n/**\n * Sets whether to ignore case.\n * NOTE: If there are already key/value pairs in the QueryData, and\n * ignoreCase_ is set to false, the keys will all be lower-cased.\n * @param {boolean} ignoreCase whether this goog.Uri should ignore case.\n * @return {!goog.Uri} Reference to this Uri object.\n */\ngoog.Uri.prototype.setIgnoreCase = function(ignoreCase) {\n  this.ignoreCase_ = ignoreCase;\n  if (this.queryData_) {\n    this.queryData_.setIgnoreCase(ignoreCase);\n  }\n  return this;\n};\n\n\n/**\n * @return {boolean} Whether to ignore case.\n */\ngoog.Uri.prototype.getIgnoreCase = function() {\n  return this.ignoreCase_;\n};\n\n\n//==============================================================================\n// Static members\n//==============================================================================\n\n\n/**\n * Creates a uri from the string form.  Basically an alias of new goog.Uri().\n * If a Uri object is passed to parse then it will return a clone of the object.\n *\n * @throws URIError If parsing the URI is malformed. The passed URI components\n *     should all be parseable by decodeURIComponent.\n * @param {*} uri Raw URI string or instance of Uri\n *     object.\n * @param {boolean=} opt_ignoreCase Whether to ignore the case of parameter\n * names in #getParameterValue.\n * @return {!goog.Uri} The new URI object.\n */\ngoog.Uri.parse = function(uri, opt_ignoreCase) {\n  return uri instanceof goog.Uri ? uri.clone() :\n                                   new goog.Uri(uri, opt_ignoreCase);\n};\n\n\n/**\n * Creates a new goog.Uri object from unencoded parts.\n *\n * @param {?string=} opt_scheme Scheme/protocol or full URI to parse.\n * @param {?string=} opt_userInfo username:password.\n * @param {?string=} opt_domain www.google.com.\n * @param {?number=} opt_port 9830.\n * @param {?string=} opt_path /some/path/to/a/file.html.\n * @param {string|goog.Uri.QueryData=} opt_query a=1&b=2.\n * @param {?string=} opt_fragment The fragment without the #.\n * @param {boolean=} opt_ignoreCase Whether to ignore parameter name case in\n *     #getParameterValue.\n *\n * @return {!goog.Uri} The new URI object.\n */\ngoog.Uri.create = function(\n    opt_scheme, opt_userInfo, opt_domain, opt_port, opt_path, opt_query,\n    opt_fragment, opt_ignoreCase) {\n  var uri = new goog.Uri(null, opt_ignoreCase);\n\n  // Only set the parts if they are defined and not empty strings.\n  opt_scheme && uri.setScheme(opt_scheme);\n  opt_userInfo && uri.setUserInfo(opt_userInfo);\n  opt_domain && uri.setDomain(opt_domain);\n  opt_port && uri.setPort(opt_port);\n  opt_path && uri.setPath(opt_path);\n  opt_query && uri.setQueryData(opt_query);\n  opt_fragment && uri.setFragment(opt_fragment);\n\n  return uri;\n};\n\n\n/**\n * Resolves a relative Uri against a base Uri, accepting both strings and\n * Uri objects.\n *\n * @param {*} base Base Uri.\n * @param {*} rel Relative Uri.\n * @return {!goog.Uri} Resolved uri.\n */\ngoog.Uri.resolve = function(base, rel) {\n  if (!(base instanceof goog.Uri)) {\n    base = goog.Uri.parse(base);\n  }\n\n  if (!(rel instanceof goog.Uri)) {\n    rel = goog.Uri.parse(rel);\n  }\n\n  return base.resolve(rel);\n};\n\n\n/**\n * Removes dot segments in given path component, as described in\n * RFC 3986, section 5.2.4.\n *\n * @param {string} path A non-empty path component.\n * @return {string} Path component with removed dot segments.\n */\ngoog.Uri.removeDotSegments = function(path) {\n  if (path == '..' || path == '.') {\n    return '';\n\n  } else if (\n      !goog.string.contains(path, './') && !goog.string.contains(path, '/.')) {\n    // This optimization detects uris which do not contain dot-segments,\n    // and as a consequence do not require any processing.\n    return path;\n\n  } else {\n    var leadingSlash = goog.string.startsWith(path, '/');\n    var segments = path.split('/');\n    var out = [];\n\n    for (var pos = 0; pos < segments.length;) {\n      var segment = segments[pos++];\n\n      if (segment == '.') {\n        if (leadingSlash && pos == segments.length) {\n          out.push('');\n        }\n      } else if (segment == '..') {\n        if (out.length > 1 || out.length == 1 && out[0] != '') {\n          out.pop();\n        }\n        if (leadingSlash && pos == segments.length) {\n          out.push('');\n        }\n      } else {\n        out.push(segment);\n        leadingSlash = true;\n      }\n    }\n\n    return out.join('/');\n  }\n};\n\n\n/**\n * Decodes a value or returns the empty string if it isn't defined or empty.\n * @throws URIError If decodeURIComponent fails to decode val.\n * @param {string|undefined} val Value to decode.\n * @param {boolean=} opt_preserveReserved If true, restricted characters will\n *     not be decoded.\n * @return {string} Decoded value.\n * @private\n */\ngoog.Uri.decodeOrEmpty_ = function(val, opt_preserveReserved) {\n  // Don't use UrlDecode() here because val is not a query parameter.\n  if (!val) {\n    return '';\n  }\n\n  // decodeURI has the same output for '%2f' and '%252f'. We double encode %25\n  // so that we can distinguish between the 2 inputs. This is later undone by\n  // removeDoubleEncoding_.\n  return opt_preserveReserved ? decodeURI(val.replace(/%25/g, '%2525')) :\n                                decodeURIComponent(val);\n};\n\n\n/**\n * If unescapedPart is non null, then escapes any characters in it that aren't\n * valid characters in a url and also escapes any special characters that\n * appear in extra.\n *\n * @param {*} unescapedPart The string to encode.\n * @param {RegExp} extra A character set of characters in [\\01-\\177].\n * @param {boolean=} opt_removeDoubleEncoding If true, remove double percent\n *     encoding.\n * @return {?string} null iff unescapedPart == null.\n * @private\n */\ngoog.Uri.encodeSpecialChars_ = function(\n    unescapedPart, extra, opt_removeDoubleEncoding) {\n  if (typeof unescapedPart === 'string') {\n    var encoded = encodeURI(unescapedPart).replace(extra, goog.Uri.encodeChar_);\n    if (opt_removeDoubleEncoding) {\n      // encodeURI double-escapes %XX sequences used to represent restricted\n      // characters in some URI components, remove the double escaping here.\n      encoded = goog.Uri.removeDoubleEncoding_(encoded);\n    }\n    return encoded;\n  }\n  return null;\n};\n\n\n/**\n * Converts a character in [\\01-\\177] to its unicode character equivalent.\n * @param {string} ch One character string.\n * @return {string} Encoded string.\n * @private\n */\ngoog.Uri.encodeChar_ = function(ch) {\n  var n = ch.charCodeAt(0);\n  return '%' + ((n >> 4) & 0xf).toString(16) + (n & 0xf).toString(16);\n};\n\n\n/**\n * Removes double percent-encoding from a string.\n * @param  {string} doubleEncodedString String\n * @return {string} String with double encoding removed.\n * @private\n */\ngoog.Uri.removeDoubleEncoding_ = function(doubleEncodedString) {\n  return doubleEncodedString.replace(/%25([0-9a-fA-F]{2})/g, '%$1');\n};\n\n\n/**\n * Regular expression for characters that are disallowed in the scheme or\n * userInfo part of the URI.\n * @type {RegExp}\n * @private\n */\ngoog.Uri.reDisallowedInSchemeOrUserInfo_ = /[#\\/\\?@]/g;\n\n\n/**\n * Regular expression for characters that are disallowed in a relative path.\n * Colon is included due to RFC 3986 3.3.\n * @type {RegExp}\n * @private\n */\ngoog.Uri.reDisallowedInRelativePath_ = /[\\#\\?:]/g;\n\n\n/**\n * Regular expression for characters that are disallowed in an absolute path.\n * @type {RegExp}\n * @private\n */\ngoog.Uri.reDisallowedInAbsolutePath_ = /[\\#\\?]/g;\n\n\n/**\n * Regular expression for characters that are disallowed in the query.\n * @type {RegExp}\n * @private\n */\ngoog.Uri.reDisallowedInQuery_ = /[\\#\\?@]/g;\n\n\n/**\n * Regular expression for characters that are disallowed in the fragment.\n * @type {RegExp}\n * @private\n */\ngoog.Uri.reDisallowedInFragment_ = /#/g;\n\n\n/**\n * Checks whether two URIs have the same domain.\n * @param {string} uri1String First URI string.\n * @param {string} uri2String Second URI string.\n * @return {boolean} true if the two URIs have the same domain; false otherwise.\n */\ngoog.Uri.haveSameDomain = function(uri1String, uri2String) {\n  // Differs from goog.uri.utils.haveSameDomain, since this ignores scheme.\n  // TODO(gboyer): Have this just call goog.uri.util.haveSameDomain.\n  var pieces1 = goog.uri.utils.split(uri1String);\n  var pieces2 = goog.uri.utils.split(uri2String);\n  return pieces1[goog.uri.utils.ComponentIndex.DOMAIN] ==\n      pieces2[goog.uri.utils.ComponentIndex.DOMAIN] &&\n      pieces1[goog.uri.utils.ComponentIndex.PORT] ==\n      pieces2[goog.uri.utils.ComponentIndex.PORT];\n};\n\n\n\n/**\n * Class used to represent URI query parameters.  It is essentially a hash of\n * name-value pairs, though a name can be present more than once.\n *\n * Has the same interface as the collections in goog.structs.\n *\n * @param {?string=} opt_query Optional encoded query string to parse into\n *     the object.\n * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter\n *     name in #get.\n * @constructor\n * @struct\n * @final\n */\ngoog.Uri.QueryData = function(opt_query, opt_ignoreCase) {\n  /**\n   * The map containing name/value or name/array-of-values pairs.\n   * May be null if it requires parsing from the query string.\n   *\n   * We need to use a Map because we cannot guarantee that the key names will\n   * not be problematic for IE.\n   *\n   * @private {?goog.structs.Map<string, !Array<*>>}\n   */\n  this.keyMap_ = null;\n\n  /**\n   * The number of params, or null if it requires computing.\n   * @private {?number}\n   */\n  this.count_ = null;\n\n  /**\n   * Encoded query string, or null if it requires computing from the key map.\n   * @private {?string}\n   */\n  this.encodedQuery_ = opt_query || null;\n\n  /**\n   * If true, ignore the case of the parameter name in #get.\n   * @private {boolean}\n   */\n  this.ignoreCase_ = !!opt_ignoreCase;\n};\n\n\n/**\n * If the underlying key map is not yet initialized, it parses the\n * query string and fills the map with parsed data.\n * @private\n */\ngoog.Uri.QueryData.prototype.ensureKeyMapInitialized_ = function() {\n  if (!this.keyMap_) {\n    this.keyMap_ = new goog.structs.Map();\n    this.count_ = 0;\n    if (this.encodedQuery_) {\n      var self = this;\n      goog.uri.utils.parseQueryData(this.encodedQuery_, function(name, value) {\n        self.add(goog.string.urlDecode(name), value);\n      });\n    }\n  }\n};\n\n\n/**\n * Creates a new query data instance from a map of names and values.\n *\n * @param {!goog.structs.Map<string, ?>|!Object} map Map of string parameter\n *     names to parameter value. If parameter value is an array, it is\n *     treated as if the key maps to each individual value in the\n *     array.\n * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter\n *     name in #get.\n * @return {!goog.Uri.QueryData} The populated query data instance.\n */\ngoog.Uri.QueryData.createFromMap = function(map, opt_ignoreCase) {\n  var keys = goog.structs.getKeys(map);\n  if (typeof keys == 'undefined') {\n    throw new Error('Keys are undefined');\n  }\n\n  var queryData = new goog.Uri.QueryData(null, opt_ignoreCase);\n  var values = goog.structs.getValues(map);\n  for (var i = 0; i < keys.length; i++) {\n    var key = keys[i];\n    var value = values[i];\n    if (!Array.isArray(value)) {\n      queryData.add(key, value);\n    } else {\n      queryData.setValues(key, value);\n    }\n  }\n  return queryData;\n};\n\n\n/**\n * Creates a new query data instance from parallel arrays of parameter names\n * and values. Allows for duplicate parameter names. Throws an error if the\n * lengths of the arrays differ.\n *\n * @param {!Array<string>} keys Parameter names.\n * @param {!Array<?>} values Parameter values.\n * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter\n *     name in #get.\n * @return {!goog.Uri.QueryData} The populated query data instance.\n */\ngoog.Uri.QueryData.createFromKeysValues = function(\n    keys, values, opt_ignoreCase) {\n  if (keys.length != values.length) {\n    throw new Error('Mismatched lengths for keys/values');\n  }\n  var queryData = new goog.Uri.QueryData(null, opt_ignoreCase);\n  for (var i = 0; i < keys.length; i++) {\n    queryData.add(keys[i], values[i]);\n  }\n  return queryData;\n};\n\n\n/**\n * @return {?number} The number of parameters.\n */\ngoog.Uri.QueryData.prototype.getCount = function() {\n  this.ensureKeyMapInitialized_();\n  return this.count_;\n};\n\n\n/**\n * Adds a key value pair.\n * @param {string} key Name.\n * @param {*} value Value.\n * @return {!goog.Uri.QueryData} Instance of this object.\n */\ngoog.Uri.QueryData.prototype.add = function(key, value) {\n  this.ensureKeyMapInitialized_();\n  this.invalidateCache_();\n\n  key = this.getKeyName_(key);\n  var values = this.keyMap_.get(key);\n  if (!values) {\n    this.keyMap_.set(key, (values = []));\n  }\n  values.push(value);\n  this.count_ = goog.asserts.assertNumber(this.count_) + 1;\n  return this;\n};\n\n\n/**\n * Removes all the params with the given key.\n * @param {string} key Name.\n * @return {boolean} Whether any parameter was removed.\n */\ngoog.Uri.QueryData.prototype.remove = function(key) {\n  this.ensureKeyMapInitialized_();\n\n  key = this.getKeyName_(key);\n  if (this.keyMap_.containsKey(key)) {\n    this.invalidateCache_();\n\n    // Decrement parameter count.\n    this.count_ =\n        goog.asserts.assertNumber(this.count_) - this.keyMap_.get(key).length;\n    return this.keyMap_.remove(key);\n  }\n  return false;\n};\n\n\n/**\n * Clears the parameters.\n */\ngoog.Uri.QueryData.prototype.clear = function() {\n  this.invalidateCache_();\n  this.keyMap_ = null;\n  this.count_ = 0;\n};\n\n\n/**\n * @return {boolean} Whether we have any parameters.\n */\ngoog.Uri.QueryData.prototype.isEmpty = function() {\n  this.ensureKeyMapInitialized_();\n  return this.count_ == 0;\n};\n\n\n/**\n * Whether there is a parameter with the given name\n * @param {string} key The parameter name to check for.\n * @return {boolean} Whether there is a parameter with the given name.\n */\ngoog.Uri.QueryData.prototype.containsKey = function(key) {\n  this.ensureKeyMapInitialized_();\n  key = this.getKeyName_(key);\n  return this.keyMap_.containsKey(key);\n};\n\n\n/**\n * Whether there is a parameter with the given value.\n * @param {*} value The value to check for.\n * @return {boolean} Whether there is a parameter with the given value.\n */\ngoog.Uri.QueryData.prototype.containsValue = function(value) {\n  // NOTE(arv): This solution goes through all the params even if it was the\n  // first param. We can get around this by not reusing code or by switching to\n  // iterators.\n  var vals = this.getValues();\n  return goog.array.contains(vals, value);\n};\n\n\n/**\n * Runs a callback on every key-value pair in the map, including duplicate keys.\n * This won't maintain original order when duplicate keys are interspersed (like\n * getKeys() / getValues()).\n * @param {function(this:SCOPE, ?, string, !goog.Uri.QueryData)} f\n * @param {SCOPE=} opt_scope The value of \"this\" inside f.\n * @template SCOPE\n */\ngoog.Uri.QueryData.prototype.forEach = function(f, opt_scope) {\n  this.ensureKeyMapInitialized_();\n  this.keyMap_.forEach(function(values, key) {\n    goog.array.forEach(values, function(value) {\n      f.call(opt_scope, value, key, this);\n    }, this);\n  }, this);\n};\n\n\n/**\n * Returns all the keys of the parameters. If a key is used multiple times\n * it will be included multiple times in the returned array\n * @return {!Array<string>} All the keys of the parameters.\n */\ngoog.Uri.QueryData.prototype.getKeys = function() {\n  this.ensureKeyMapInitialized_();\n  // We need to get the values to know how many keys to add.\n  var vals = this.keyMap_.getValues();\n  var keys = this.keyMap_.getKeys();\n  var rv = [];\n  for (var i = 0; i < keys.length; i++) {\n    var val = vals[i];\n    for (var j = 0; j < val.length; j++) {\n      rv.push(keys[i]);\n    }\n  }\n  return rv;\n};\n\n\n/**\n * Returns all the values of the parameters with the given name. If the query\n * data has no such key this will return an empty array. If no key is given\n * all values wil be returned.\n * @param {string=} opt_key The name of the parameter to get the values for.\n * @return {!Array<?>} All the values of the parameters with the given name.\n */\ngoog.Uri.QueryData.prototype.getValues = function(opt_key) {\n  this.ensureKeyMapInitialized_();\n  var rv = [];\n  if (typeof opt_key === 'string') {\n    if (this.containsKey(opt_key)) {\n      rv = goog.array.concat(rv, this.keyMap_.get(this.getKeyName_(opt_key)));\n    }\n  } else {\n    // Return all values.\n    var values = this.keyMap_.getValues();\n    for (var i = 0; i < values.length; i++) {\n      rv = goog.array.concat(rv, values[i]);\n    }\n  }\n  return rv;\n};\n\n\n/**\n * Sets a key value pair and removes all other keys with the same value.\n *\n * @param {string} key Name.\n * @param {*} value Value.\n * @return {!goog.Uri.QueryData} Instance of this object.\n */\ngoog.Uri.QueryData.prototype.set = function(key, value) {\n  this.ensureKeyMapInitialized_();\n  this.invalidateCache_();\n\n  // TODO(chrishenry): This could be better written as\n  // this.remove(key), this.add(key, value), but that would reorder\n  // the key (since the key is first removed and then added at the\n  // end) and we would have to fix unit tests that depend on key\n  // ordering.\n  key = this.getKeyName_(key);\n  if (this.containsKey(key)) {\n    this.count_ =\n        goog.asserts.assertNumber(this.count_) - this.keyMap_.get(key).length;\n  }\n  this.keyMap_.set(key, [value]);\n  this.count_ = goog.asserts.assertNumber(this.count_) + 1;\n  return this;\n};\n\n\n/**\n * Returns the first value associated with the key. If the query data has no\n * such key this will return undefined or the optional default.\n * @param {string} key The name of the parameter to get the value for.\n * @param {*=} opt_default The default value to return if the query data\n *     has no such key.\n * @return {*} The first string value associated with the key, or opt_default\n *     if there's no value.\n */\ngoog.Uri.QueryData.prototype.get = function(key, opt_default) {\n  if (!key) {\n    return opt_default;\n  }\n  var values = this.getValues(key);\n  return values.length > 0 ? String(values[0]) : opt_default;\n};\n\n\n/**\n * Sets the values for a key. If the key already exists, this will\n * override all of the existing values that correspond to the key.\n * @param {string} key The key to set values for.\n * @param {!Array<?>} values The values to set.\n */\ngoog.Uri.QueryData.prototype.setValues = function(key, values) {\n  this.remove(key);\n\n  if (values.length > 0) {\n    this.invalidateCache_();\n    this.keyMap_.set(this.getKeyName_(key), goog.array.clone(values));\n    this.count_ = goog.asserts.assertNumber(this.count_) + values.length;\n  }\n};\n\n\n/**\n * @return {string} Encoded query string.\n * @override\n */\ngoog.Uri.QueryData.prototype.toString = function() {\n  if (this.encodedQuery_) {\n    return this.encodedQuery_;\n  }\n\n  if (!this.keyMap_) {\n    return '';\n  }\n\n  var sb = [];\n\n  // In the past, we use this.getKeys() and this.getVals(), but that\n  // generates a lot of allocations as compared to simply iterating\n  // over the keys.\n  var keys = this.keyMap_.getKeys();\n  for (var i = 0; i < keys.length; i++) {\n    var key = keys[i];\n    var encodedKey = goog.string.urlEncode(key);\n    var val = this.getValues(key);\n    for (var j = 0; j < val.length; j++) {\n      var param = encodedKey;\n      // Ensure that null and undefined are encoded into the url as\n      // literal strings.\n      if (val[j] !== '') {\n        param += '=' + goog.string.urlEncode(val[j]);\n      }\n      sb.push(param);\n    }\n  }\n\n  return this.encodedQuery_ = sb.join('&');\n};\n\n\n/**\n * @throws URIError If URI is malformed (that is, if decodeURIComponent fails on\n *     any of the URI components).\n * @return {string} Decoded query string.\n */\ngoog.Uri.QueryData.prototype.toDecodedString = function() {\n  return goog.Uri.decodeOrEmpty_(this.toString());\n};\n\n\n/**\n * Invalidate the cache.\n * @private\n */\ngoog.Uri.QueryData.prototype.invalidateCache_ = function() {\n  this.encodedQuery_ = null;\n};\n\n\n/**\n * Removes all keys that are not in the provided list. (Modifies this object.)\n * @param {Array<string>} keys The desired keys.\n * @return {!goog.Uri.QueryData} a reference to this object.\n */\ngoog.Uri.QueryData.prototype.filterKeys = function(keys) {\n  this.ensureKeyMapInitialized_();\n  this.keyMap_.forEach(function(value, key) {\n    if (!goog.array.contains(keys, key)) {\n      this.remove(key);\n    }\n  }, this);\n  return this;\n};\n\n\n/**\n * Clone the query data instance.\n * @return {!goog.Uri.QueryData} New instance of the QueryData object.\n */\ngoog.Uri.QueryData.prototype.clone = function() {\n  var rv = new goog.Uri.QueryData();\n  rv.encodedQuery_ = this.encodedQuery_;\n  if (this.keyMap_) {\n    rv.keyMap_ = this.keyMap_.clone();\n    rv.count_ = this.count_;\n  }\n  return rv;\n};\n\n\n/**\n * Helper function to get the key name from a JavaScript object. Converts\n * the object to a string, and to lower case if necessary.\n * @private\n * @param {*} arg The object to get a key name from.\n * @return {string} valid key name which can be looked up in #keyMap_.\n */\ngoog.Uri.QueryData.prototype.getKeyName_ = function(arg) {\n  var keyName = String(arg);\n  if (this.ignoreCase_) {\n    keyName = keyName.toLowerCase();\n  }\n  return keyName;\n};\n\n\n/**\n * Ignore case in parameter names.\n * NOTE: If there are already key/value pairs in the QueryData, and\n * ignoreCase_ is set to false, the keys will all be lower-cased.\n * @param {boolean} ignoreCase whether this goog.Uri should ignore case.\n */\ngoog.Uri.QueryData.prototype.setIgnoreCase = function(ignoreCase) {\n  var resetKeys = ignoreCase && !this.ignoreCase_;\n  if (resetKeys) {\n    this.ensureKeyMapInitialized_();\n    this.invalidateCache_();\n    this.keyMap_.forEach(function(value, key) {\n      var lowerCase = key.toLowerCase();\n      if (key != lowerCase) {\n        this.remove(key);\n        this.setValues(lowerCase, value);\n      }\n    }, this);\n  }\n  this.ignoreCase_ = ignoreCase;\n};\n\n\n/**\n * Extends a query data object with another query data or map like object. This\n * operates 'in-place', it does not create a new QueryData object.\n *\n * @param {...(?goog.Uri.QueryData|?goog.structs.Map<?, ?>|?Object)} var_args\n *     The object from which key value pairs will be copied. Note: does not\n *     accept null.\n * @suppress {deprecated} Use deprecated goog.structs.forEach to allow different\n * types of parameters.\n */\ngoog.Uri.QueryData.prototype.extend = function(var_args) {\n  for (var i = 0; i < arguments.length; i++) {\n    var data = arguments[i];\n    goog.structs.forEach(data, function(value, key) {\n      this.add(key, value);\n    }, this);\n  }\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Utilities for string manipulation.\n */\n\n\n/**\n * Namespace for string utilities\n */\ngoog.provide('goog.string');\ngoog.provide('goog.string.Unicode');\n\ngoog.require('goog.dom.safe');\ngoog.require('goog.html.uncheckedconversions');\ngoog.require('goog.string.Const');\ngoog.require('goog.string.internal');\n\n\n/**\n * @define {boolean} Enables HTML escaping of lowercase letter \"e\" which helps\n * with detection of double-escaping as this letter is frequently used.\n */\ngoog.string.DETECT_DOUBLE_ESCAPING =\n    goog.define('goog.string.DETECT_DOUBLE_ESCAPING', false);\n\n\n/**\n * @define {boolean} Whether to force non-dom html unescaping.\n */\ngoog.string.FORCE_NON_DOM_HTML_UNESCAPING =\n    goog.define('goog.string.FORCE_NON_DOM_HTML_UNESCAPING', false);\n\n\n/**\n * Common Unicode string characters.\n * @enum {string}\n */\ngoog.string.Unicode = {\n  NBSP: '\\xa0'\n};\n\n\n/**\n * Fast prefix-checker.\n * @param {string} str The string to check.\n * @param {string} prefix A string to look for at the start of `str`.\n * @return {boolean} True if `str` begins with `prefix`.\n */\ngoog.string.startsWith = goog.string.internal.startsWith;\n\n\n/**\n * Fast suffix-checker.\n * @param {string} str The string to check.\n * @param {string} suffix A string to look for at the end of `str`.\n * @return {boolean} True if `str` ends with `suffix`.\n */\ngoog.string.endsWith = goog.string.internal.endsWith;\n\n\n/**\n * Case-insensitive prefix-checker.\n * @param {string} str The string to check.\n * @param {string} prefix  A string to look for at the end of `str`.\n * @return {boolean} True if `str` begins with `prefix` (ignoring\n *     case).\n */\ngoog.string.caseInsensitiveStartsWith =\n    goog.string.internal.caseInsensitiveStartsWith;\n\n\n/**\n * Case-insensitive suffix-checker.\n * @param {string} str The string to check.\n * @param {string} suffix A string to look for at the end of `str`.\n * @return {boolean} True if `str` ends with `suffix` (ignoring\n *     case).\n */\ngoog.string.caseInsensitiveEndsWith =\n    goog.string.internal.caseInsensitiveEndsWith;\n\n\n/**\n * Case-insensitive equality checker.\n * @param {string} str1 First string to check.\n * @param {string} str2 Second string to check.\n * @return {boolean} True if `str1` and `str2` are the same string,\n *     ignoring case.\n */\ngoog.string.caseInsensitiveEquals = goog.string.internal.caseInsensitiveEquals;\n\n\n/**\n * Does simple python-style string substitution.\n * subs(\"foo%s hot%s\", \"bar\", \"dog\") becomes \"foobar hotdog\".\n * @param {string} str The string containing the pattern.\n * @param {...*} var_args The items to substitute into the pattern.\n * @return {string} A copy of `str` in which each occurrence of\n *     {@code %s} has been replaced an argument from `var_args`.\n */\ngoog.string.subs = function(str, var_args) {\n  var splitParts = str.split('%s');\n  var returnString = '';\n\n  var subsArguments = Array.prototype.slice.call(arguments, 1);\n  while (subsArguments.length &&\n         // Replace up to the last split part. We are inserting in the\n         // positions between split parts.\n         splitParts.length > 1) {\n    returnString += splitParts.shift() + subsArguments.shift();\n  }\n\n  return returnString + splitParts.join('%s');  // Join unused '%s'\n};\n\n\n/**\n * Converts multiple whitespace chars (spaces, non-breaking-spaces, new lines\n * and tabs) to a single space, and strips leading and trailing whitespace.\n * @param {string} str Input string.\n * @return {string} A copy of `str` with collapsed whitespace.\n */\ngoog.string.collapseWhitespace = function(str) {\n  // Since IE doesn't include non-breaking-space (0xa0) in their \\s character\n  // class (as required by section 7.2 of the ECMAScript spec), we explicitly\n  // include it in the regexp to enforce consistent cross-browser behavior.\n  return str.replace(/[\\s\\xa0]+/g, ' ').replace(/^\\s+|\\s+$/g, '');\n};\n\n\n/**\n * Checks if a string is empty or contains only whitespaces.\n * @param {string} str The string to check.\n * @return {boolean} Whether `str` is empty or whitespace only.\n */\ngoog.string.isEmptyOrWhitespace = goog.string.internal.isEmptyOrWhitespace;\n\n\n/**\n * Checks if a string is empty.\n * @param {string} str The string to check.\n * @return {boolean} Whether `str` is empty.\n */\ngoog.string.isEmptyString = function(str) {\n  return str.length == 0;\n};\n\n\n/**\n * Checks if a string is empty or contains only whitespaces.\n *\n * @param {string} str The string to check.\n * @return {boolean} Whether `str` is empty or whitespace only.\n * @deprecated Use goog.string.isEmptyOrWhitespace instead.\n */\ngoog.string.isEmpty = goog.string.isEmptyOrWhitespace;\n\n\n/**\n * Checks if a string is null, undefined, empty or contains only whitespaces.\n * @param {*} str The string to check.\n * @return {boolean} Whether `str` is null, undefined, empty, or\n *     whitespace only.\n * @deprecated Use goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str))\n *     instead.\n */\ngoog.string.isEmptyOrWhitespaceSafe = function(str) {\n  return goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str));\n};\n\n\n/**\n * Checks if a string is null, undefined, empty or contains only whitespaces.\n *\n * @param {*} str The string to check.\n * @return {boolean} Whether `str` is null, undefined, empty, or\n *     whitespace only.\n * @deprecated Use goog.string.isEmptyOrWhitespace instead.\n */\ngoog.string.isEmptySafe = goog.string.isEmptyOrWhitespaceSafe;\n\n\n/**\n * Checks if a string is all breaking whitespace.\n * @param {string} str The string to check.\n * @return {boolean} Whether the string is all breaking whitespace.\n */\ngoog.string.isBreakingWhitespace = function(str) {\n  return !/[^\\t\\n\\r ]/.test(str);\n};\n\n\n/**\n * Checks if a string contains all letters.\n * @param {string} str string to check.\n * @return {boolean} True if `str` consists entirely of letters.\n */\ngoog.string.isAlpha = function(str) {\n  return !/[^a-zA-Z]/.test(str);\n};\n\n\n/**\n * Checks if a string contains only numbers.\n * @param {*} str string to check. If not a string, it will be\n *     casted to one.\n * @return {boolean} True if `str` is numeric.\n */\ngoog.string.isNumeric = function(str) {\n  return !/[^0-9]/.test(str);\n};\n\n\n/**\n * Checks if a string contains only numbers or letters.\n * @param {string} str string to check.\n * @return {boolean} True if `str` is alphanumeric.\n */\ngoog.string.isAlphaNumeric = function(str) {\n  return !/[^a-zA-Z0-9]/.test(str);\n};\n\n\n/**\n * Checks if a character is a space character.\n * @param {string} ch Character to check.\n * @return {boolean} True if `ch` is a space.\n */\ngoog.string.isSpace = function(ch) {\n  return ch == ' ';\n};\n\n\n/**\n * Checks if a character is a valid unicode character.\n * @param {string} ch Character to check.\n * @return {boolean} True if `ch` is a valid unicode character.\n */\ngoog.string.isUnicodeChar = function(ch) {\n  return ch.length == 1 && ch >= ' ' && ch <= '~' ||\n      ch >= '\\u0080' && ch <= '\\uFFFD';\n};\n\n\n/**\n * Takes a string and replaces newlines with a space. Multiple lines are\n * replaced with a single space.\n * @param {string} str The string from which to strip newlines.\n * @return {string} A copy of `str` stripped of newlines.\n */\ngoog.string.stripNewlines = function(str) {\n  return str.replace(/(\\r\\n|\\r|\\n)+/g, ' ');\n};\n\n\n/**\n * Replaces Windows and Mac new lines with unix style: \\r or \\r\\n with \\n.\n * @param {string} str The string to in which to canonicalize newlines.\n * @return {string} `str` A copy of {@code} with canonicalized newlines.\n */\ngoog.string.canonicalizeNewlines = function(str) {\n  return str.replace(/(\\r\\n|\\r|\\n)/g, '\\n');\n};\n\n\n/**\n * Normalizes whitespace in a string, replacing all whitespace chars with\n * a space.\n * @param {string} str The string in which to normalize whitespace.\n * @return {string} A copy of `str` with all whitespace normalized.\n */\ngoog.string.normalizeWhitespace = function(str) {\n  return str.replace(/\\xa0|\\s/g, ' ');\n};\n\n\n/**\n * Normalizes spaces in a string, replacing all consecutive spaces and tabs\n * with a single space. Replaces non-breaking space with a space.\n * @param {string} str The string in which to normalize spaces.\n * @return {string} A copy of `str` with all consecutive spaces and tabs\n *    replaced with a single space.\n */\ngoog.string.normalizeSpaces = function(str) {\n  return str.replace(/\\xa0|[ \\t]+/g, ' ');\n};\n\n\n/**\n * Removes the breaking spaces from the left and right of the string and\n * collapses the sequences of breaking spaces in the middle into single spaces.\n * The original and the result strings render the same way in HTML.\n * @param {string} str A string in which to collapse spaces.\n * @return {string} Copy of the string with normalized breaking spaces.\n */\ngoog.string.collapseBreakingSpaces = function(str) {\n  return str.replace(/[\\t\\r\\n ]+/g, ' ')\n      .replace(/^[\\t\\r\\n ]+|[\\t\\r\\n ]+$/g, '');\n};\n\n\n/**\n * Trims white spaces to the left and right of a string.\n * @param {string} str The string to trim.\n * @return {string} A trimmed copy of `str`.\n */\ngoog.string.trim = goog.string.internal.trim;\n\n\n/**\n * Trims whitespaces at the left end of a string.\n * @param {string} str The string to left trim.\n * @return {string} A trimmed copy of `str`.\n */\ngoog.string.trimLeft = function(str) {\n  // Since IE doesn't include non-breaking-space (0xa0) in their \\s character\n  // class (as required by section 7.2 of the ECMAScript spec), we explicitly\n  // include it in the regexp to enforce consistent cross-browser behavior.\n  return str.replace(/^[\\s\\xa0]+/, '');\n};\n\n\n/**\n * Trims whitespaces at the right end of a string.\n * @param {string} str The string to right trim.\n * @return {string} A trimmed copy of `str`.\n */\ngoog.string.trimRight = function(str) {\n  // Since IE doesn't include non-breaking-space (0xa0) in their \\s character\n  // class (as required by section 7.2 of the ECMAScript spec), we explicitly\n  // include it in the regexp to enforce consistent cross-browser behavior.\n  return str.replace(/[\\s\\xa0]+$/, '');\n};\n\n\n/**\n * A string comparator that ignores case.\n * -1 = str1 less than str2\n *  0 = str1 equals str2\n *  1 = str1 greater than str2\n *\n * @param {string} str1 The string to compare.\n * @param {string} str2 The string to compare `str1` to.\n * @return {number} The comparator result, as described above.\n */\ngoog.string.caseInsensitiveCompare =\n    goog.string.internal.caseInsensitiveCompare;\n\n\n/**\n * Compares two strings interpreting their numeric substrings as numbers.\n *\n * @param {string} str1 First string.\n * @param {string} str2 Second string.\n * @param {!RegExp} tokenizerRegExp Splits a string into substrings of\n *     non-negative integers, non-numeric characters and optionally fractional\n *     numbers starting with a decimal point.\n * @return {number} Negative if str1 < str2, 0 is str1 == str2, positive if\n *     str1 > str2.\n * @private\n */\ngoog.string.numberAwareCompare_ = function(str1, str2, tokenizerRegExp) {\n  if (str1 == str2) {\n    return 0;\n  }\n  if (!str1) {\n    return -1;\n  }\n  if (!str2) {\n    return 1;\n  }\n\n  // Using match to split the entire string ahead of time turns out to be faster\n  // for most inputs than using RegExp.exec or iterating over each character.\n  var tokens1 = str1.toLowerCase().match(tokenizerRegExp);\n  var tokens2 = str2.toLowerCase().match(tokenizerRegExp);\n\n  var count = Math.min(tokens1.length, tokens2.length);\n\n  for (var i = 0; i < count; i++) {\n    var a = tokens1[i];\n    var b = tokens2[i];\n\n    // Compare pairs of tokens, returning if one token sorts before the other.\n    if (a != b) {\n      // Only if both tokens are integers is a special comparison required.\n      // Decimal numbers are sorted as strings (e.g., '.09' < '.1').\n      var num1 = parseInt(a, 10);\n      if (!isNaN(num1)) {\n        var num2 = parseInt(b, 10);\n        if (!isNaN(num2) && num1 - num2) {\n          return num1 - num2;\n        }\n      }\n      return a < b ? -1 : 1;\n    }\n  }\n\n  // If one string is a substring of the other, the shorter string sorts first.\n  if (tokens1.length != tokens2.length) {\n    return tokens1.length - tokens2.length;\n  }\n\n  // The two strings must be equivalent except for case (perfect equality is\n  // tested at the head of the function.) Revert to default ASCII string\n  // comparison to stabilize the sort.\n  return str1 < str2 ? -1 : 1;\n};\n\n\n/**\n * String comparison function that handles non-negative integer numbers in a\n * way humans might expect. Using this function, the string 'File 2.jpg' sorts\n * before 'File 10.jpg', and 'Version 1.9' before 'Version 1.10'. The comparison\n * is mostly case-insensitive, though strings that are identical except for case\n * are sorted with the upper-case strings before lower-case.\n *\n * This comparison function is up to 50x slower than either the default or the\n * case-insensitive compare. It should not be used in time-critical code, but\n * should be fast enough to sort several hundred short strings (like filenames)\n * with a reasonable delay.\n *\n * @param {string} str1 The string to compare in a numerically sensitive way.\n * @param {string} str2 The string to compare `str1` to.\n * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than\n *     0 if str1 > str2.\n */\ngoog.string.intAwareCompare = function(str1, str2) {\n  return goog.string.numberAwareCompare_(str1, str2, /\\d+|\\D+/g);\n};\n\n\n/**\n * String comparison function that handles non-negative integer and fractional\n * numbers in a way humans might expect. Using this function, the string\n * 'File 2.jpg' sorts before 'File 10.jpg', and '3.14' before '3.2'. Equivalent\n * to {@link goog.string.intAwareCompare} apart from the way how it interprets\n * dots.\n *\n * @param {string} str1 The string to compare in a numerically sensitive way.\n * @param {string} str2 The string to compare `str1` to.\n * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than\n *     0 if str1 > str2.\n */\ngoog.string.floatAwareCompare = function(str1, str2) {\n  return goog.string.numberAwareCompare_(str1, str2, /\\d+|\\.\\d+|\\D+/g);\n};\n\n\n/**\n * Alias for {@link goog.string.floatAwareCompare}.\n *\n * @param {string} str1\n * @param {string} str2\n * @return {number}\n */\ngoog.string.numerateCompare = goog.string.floatAwareCompare;\n\n\n/**\n * URL-encodes a string\n * @param {*} str The string to url-encode.\n * @return {string} An encoded copy of `str` that is safe for urls.\n *     Note that '#', ':', and other characters used to delimit portions\n *     of URLs *will* be encoded.\n */\ngoog.string.urlEncode = function(str) {\n  return encodeURIComponent(String(str));\n};\n\n\n/**\n * URL-decodes the string. We need to specially handle '+'s because\n * the javascript library doesn't convert them to spaces.\n * @param {string} str The string to url decode.\n * @return {string} The decoded `str`.\n */\ngoog.string.urlDecode = function(str) {\n  return decodeURIComponent(str.replace(/\\+/g, ' '));\n};\n\n\n/**\n * Converts \\n to <br>s or <br />s.\n * @param {string} str The string in which to convert newlines.\n * @param {boolean=} opt_xml Whether to use XML compatible tags.\n * @return {string} A copy of `str` with converted newlines.\n */\ngoog.string.newLineToBr = goog.string.internal.newLineToBr;\n\n\n/**\n * Escapes double quote '\"' and single quote '\\'' characters in addition to\n * '&', '<', and '>' so that a string can be included in an HTML tag attribute\n * value within double or single quotes.\n *\n * It should be noted that > doesn't need to be escaped for the HTML or XML to\n * be valid, but it has been decided to escape it for consistency with other\n * implementations.\n *\n * With goog.string.DETECT_DOUBLE_ESCAPING, this function escapes also the\n * lowercase letter \"e\".\n *\n * NOTE(user):\n * HtmlEscape is often called during the generation of large blocks of HTML.\n * Using statics for the regular expressions and strings is an optimization\n * that can more than half the amount of time IE spends in this function for\n * large apps, since strings and regexes both contribute to GC allocations.\n *\n * Testing for the presence of a character before escaping increases the number\n * of function calls, but actually provides a speed increase for the average\n * case -- since the average case often doesn't require the escaping of all 4\n * characters and indexOf() is much cheaper than replace().\n * The worst case does suffer slightly from the additional calls, therefore the\n * opt_isLikelyToContainHtmlChars option has been included for situations\n * where all 4 HTML entities are very likely to be present and need escaping.\n *\n * Some benchmarks (times tended to fluctuate +-0.05ms):\n *                                     FireFox                     IE6\n * (no chars / average (mix of cases) / all 4 chars)\n * no checks                     0.13 / 0.22 / 0.22         0.23 / 0.53 / 0.80\n * indexOf                       0.08 / 0.17 / 0.26         0.22 / 0.54 / 0.84\n * indexOf + re test             0.07 / 0.17 / 0.28         0.19 / 0.50 / 0.85\n *\n * An additional advantage of checking if replace actually needs to be called\n * is a reduction in the number of object allocations, so as the size of the\n * application grows the difference between the various methods would increase.\n *\n * @param {string} str string to be escaped.\n * @param {boolean=} opt_isLikelyToContainHtmlChars Don't perform a check to see\n *     if the character needs replacing - use this option if you expect each of\n *     the characters to appear often. Leave false if you expect few html\n *     characters to occur in your strings, such as if you are escaping HTML.\n * @return {string} An escaped copy of `str`.\n */\ngoog.string.htmlEscape = function(str, opt_isLikelyToContainHtmlChars) {\n  str = goog.string.internal.htmlEscape(str, opt_isLikelyToContainHtmlChars);\n  if (goog.string.DETECT_DOUBLE_ESCAPING) {\n    str = str.replace(goog.string.E_RE_, '&#101;');\n  }\n  return str;\n};\n\n\n/**\n * Regular expression that matches a lowercase letter \"e\", for use in escaping.\n * @const {!RegExp}\n * @private\n */\ngoog.string.E_RE_ = /e/g;\n\n\n/**\n * Unescapes an HTML string.\n *\n * @param {string} str The string to unescape.\n * @return {string} An unescaped copy of `str`.\n */\ngoog.string.unescapeEntities = function(str) {\n  if (goog.string.contains(str, '&')) {\n    // We are careful not to use a DOM if we do not have one or we explicitly\n    // requested non-DOM html unescaping.\n    if (!goog.string.FORCE_NON_DOM_HTML_UNESCAPING &&\n        'document' in goog.global) {\n      return goog.string.unescapeEntitiesUsingDom_(str);\n    } else {\n      // Fall back on pure XML entities\n      return goog.string.unescapePureXmlEntities_(str);\n    }\n  }\n  return str;\n};\n\n\n/**\n * Unescapes a HTML string using the provided document.\n *\n * @param {string} str The string to unescape.\n * @param {!Document} document A document to use in escaping the string.\n * @return {string} An unescaped copy of `str`.\n */\ngoog.string.unescapeEntitiesWithDocument = function(str, document) {\n  if (goog.string.contains(str, '&')) {\n    return goog.string.unescapeEntitiesUsingDom_(str, document);\n  }\n  return str;\n};\n\n\n/**\n * Unescapes an HTML string using a DOM to resolve non-XML, non-numeric\n * entities. This function is XSS-safe and whitespace-preserving.\n * @private\n * @param {string} str The string to unescape.\n * @param {Document=} opt_document An optional document to use for creating\n *     elements. If this is not specified then the default window.document\n *     will be used.\n * @return {string} The unescaped `str` string.\n */\ngoog.string.unescapeEntitiesUsingDom_ = function(str, opt_document) {\n  /** @type {!Object<string, string>} */\n  var seen = {'&amp;': '&', '&lt;': '<', '&gt;': '>', '&quot;': '\"'};\n  /** @type {!Element} */\n  var div;\n  if (opt_document) {\n    div = opt_document.createElement('div');\n  } else {\n    div = goog.global.document.createElement('div');\n  }\n  // Match as many valid entity characters as possible. If the actual entity\n  // happens to be shorter, it will still work as innerHTML will return the\n  // trailing characters unchanged. Since the entity characters do not include\n  // open angle bracket, there is no chance of XSS from the innerHTML use.\n  // Since no whitespace is passed to innerHTML, whitespace is preserved.\n  return str.replace(goog.string.HTML_ENTITY_PATTERN_, function(s, entity) {\n    // Check for cached entity.\n    var value = seen[s];\n    if (value) {\n      return value;\n    }\n    // Check for numeric entity.\n    if (entity.charAt(0) == '#') {\n      // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex numbers.\n      var n = Number('0' + entity.substr(1));\n      if (!isNaN(n)) {\n        value = String.fromCharCode(n);\n      }\n    }\n    // Fall back to innerHTML otherwise.\n    if (!value) {\n      // Append a non-entity character to avoid a bug in Webkit that parses\n      // an invalid entity at the end of innerHTML text as the empty string.\n      goog.dom.safe.setInnerHtml(\n          div,\n          goog.html.uncheckedconversions\n              .safeHtmlFromStringKnownToSatisfyTypeContract(\n                  goog.string.Const.from('Single HTML entity.'), s + ' '));\n      // Then remove the trailing character from the result.\n      value = div.firstChild.nodeValue.slice(0, -1);\n    }\n    // Cache and return.\n    return seen[s] = value;\n  });\n};\n\n\n/**\n * Unescapes XML entities.\n * @private\n * @param {string} str The string to unescape.\n * @return {string} An unescaped copy of `str`.\n */\ngoog.string.unescapePureXmlEntities_ = function(str) {\n  return str.replace(/&([^;]+);/g, function(s, entity) {\n    switch (entity) {\n      case 'amp':\n        return '&';\n      case 'lt':\n        return '<';\n      case 'gt':\n        return '>';\n      case 'quot':\n        return '\"';\n      default:\n        if (entity.charAt(0) == '#') {\n          // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex.\n          var n = Number('0' + entity.substr(1));\n          if (!isNaN(n)) {\n            return String.fromCharCode(n);\n          }\n        }\n        // For invalid entities we just return the entity\n        return s;\n    }\n  });\n};\n\n\n/**\n * Regular expression that matches an HTML entity.\n * See also HTML5: Tokenization / Tokenizing character references.\n * @private\n * @type {!RegExp}\n */\ngoog.string.HTML_ENTITY_PATTERN_ = /&([^;\\s<&]+);?/g;\n\n\n/**\n * Do escaping of whitespace to preserve spatial formatting. We use character\n * entity #160 to make it safer for xml.\n * @param {string} str The string in which to escape whitespace.\n * @param {boolean=} opt_xml Whether to use XML compatible tags.\n * @return {string} An escaped copy of `str`.\n */\ngoog.string.whitespaceEscape = function(str, opt_xml) {\n  // This doesn't use goog.string.preserveSpaces for backwards compatibility.\n  return goog.string.newLineToBr(str.replace(/  /g, ' &#160;'), opt_xml);\n};\n\n\n/**\n * Preserve spaces that would be otherwise collapsed in HTML by replacing them\n * with non-breaking space Unicode characters.\n * @param {string} str The string in which to preserve whitespace.\n * @return {string} A copy of `str` with preserved whitespace.\n */\ngoog.string.preserveSpaces = function(str) {\n  return str.replace(/(^|[\\n ]) /g, '$1' + goog.string.Unicode.NBSP);\n};\n\n\n/**\n * Strip quote characters around a string.  The second argument is a string of\n * characters to treat as quotes.  This can be a single character or a string of\n * multiple character and in that case each of those are treated as possible\n * quote characters. For example:\n *\n * <pre>\n * goog.string.stripQuotes('\"abc\"', '\"`') --> 'abc'\n * goog.string.stripQuotes('`abc`', '\"`') --> 'abc'\n * </pre>\n *\n * @param {string} str The string to strip.\n * @param {string} quoteChars The quote characters to strip.\n * @return {string} A copy of `str` without the quotes.\n */\ngoog.string.stripQuotes = function(str, quoteChars) {\n  var length = quoteChars.length;\n  for (var i = 0; i < length; i++) {\n    var quoteChar = length == 1 ? quoteChars : quoteChars.charAt(i);\n    if (str.charAt(0) == quoteChar && str.charAt(str.length - 1) == quoteChar) {\n      return str.substring(1, str.length - 1);\n    }\n  }\n  return str;\n};\n\n\n/**\n * Truncates a string to a certain length and adds '...' if necessary.  The\n * length also accounts for the ellipsis, so a maximum length of 10 and a string\n * 'Hello World!' produces 'Hello W...'.\n * @param {string} str The string to truncate.\n * @param {number} chars Max number of characters.\n * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped\n *     characters from being cut off in the middle.\n * @return {string} The truncated `str` string.\n */\ngoog.string.truncate = function(str, chars, opt_protectEscapedCharacters) {\n  if (opt_protectEscapedCharacters) {\n    str = goog.string.unescapeEntities(str);\n  }\n\n  if (str.length > chars) {\n    str = str.substring(0, chars - 3) + '...';\n  }\n\n  if (opt_protectEscapedCharacters) {\n    str = goog.string.htmlEscape(str);\n  }\n\n  return str;\n};\n\n\n/**\n * Truncate a string in the middle, adding \"...\" if necessary,\n * and favoring the beginning of the string.\n * @param {string} str The string to truncate the middle of.\n * @param {number} chars Max number of characters.\n * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped\n *     characters from being cutoff in the middle.\n * @param {number=} opt_trailingChars Optional number of trailing characters to\n *     leave at the end of the string, instead of truncating as close to the\n *     middle as possible.\n * @return {string} A truncated copy of `str`.\n */\ngoog.string.truncateMiddle = function(\n    str, chars, opt_protectEscapedCharacters, opt_trailingChars) {\n  if (opt_protectEscapedCharacters) {\n    str = goog.string.unescapeEntities(str);\n  }\n\n  if (opt_trailingChars && str.length > chars) {\n    if (opt_trailingChars > chars) {\n      opt_trailingChars = chars;\n    }\n    var endPoint = str.length - opt_trailingChars;\n    var startPoint = chars - opt_trailingChars;\n    str = str.substring(0, startPoint) + '...' + str.substring(endPoint);\n  } else if (str.length > chars) {\n    // Favor the beginning of the string:\n    var half = Math.floor(chars / 2);\n    var endPos = str.length - half;\n    half += chars % 2;\n    str = str.substring(0, half) + '...' + str.substring(endPos);\n  }\n\n  if (opt_protectEscapedCharacters) {\n    str = goog.string.htmlEscape(str);\n  }\n\n  return str;\n};\n\n\n/**\n * Special chars that need to be escaped for goog.string.quote.\n * @private {!Object<string, string>}\n */\ngoog.string.specialEscapeChars_ = {\n  '\\0': '\\\\0',\n  '\\b': '\\\\b',\n  '\\f': '\\\\f',\n  '\\n': '\\\\n',\n  '\\r': '\\\\r',\n  '\\t': '\\\\t',\n  '\\x0B': '\\\\x0B',  // '\\v' is not supported in JScript\n  '\"': '\\\\\"',\n  '\\\\': '\\\\\\\\',\n  // To support the use case of embedding quoted strings inside of script\n  // tags, we have to make sure HTML comments and opening/closing script tags do\n  // not appear in the resulting string. The specific strings that must be\n  // escaped are documented at:\n  // https://html.spec.whatwg.org/multipage/scripting.html#restrictions-for-contents-of-script-elements\n  '<': '\\\\u003C'  // NOTE: JSON.parse crashes on '\\\\x3c'.\n};\n\n\n/**\n * Character mappings used internally for goog.string.escapeChar.\n * @private {!Object<string, string>}\n */\ngoog.string.jsEscapeCache_ = {\n  '\\'': '\\\\\\''\n};\n\n\n/**\n * Encloses a string in double quotes and escapes characters so that the\n * string is a valid JS string. The resulting string is safe to embed in\n * `<script>` tags as \"<\" is escaped.\n * @param {string} s The string to quote.\n * @return {string} A copy of `s` surrounded by double quotes.\n */\ngoog.string.quote = function(s) {\n  s = String(s);\n  var sb = ['\"'];\n  for (var i = 0; i < s.length; i++) {\n    var ch = s.charAt(i);\n    var cc = ch.charCodeAt(0);\n    sb[i + 1] = goog.string.specialEscapeChars_[ch] ||\n        ((cc > 31 && cc < 127) ? ch : goog.string.escapeChar(ch));\n  }\n  sb.push('\"');\n  return sb.join('');\n};\n\n\n/**\n * Takes a string and returns the escaped string for that input string.\n * @param {string} str The string to escape.\n * @return {string} An escaped string representing `str`.\n */\ngoog.string.escapeString = function(str) {\n  var sb = [];\n  for (var i = 0; i < str.length; i++) {\n    sb[i] = goog.string.escapeChar(str.charAt(i));\n  }\n  return sb.join('');\n};\n\n\n/**\n * Takes a character and returns the escaped string for that character. For\n * example escapeChar(String.fromCharCode(15)) -> \"\\\\x0E\".\n * @param {string} c The character to escape.\n * @return {string} An escaped string representing `c`.\n */\ngoog.string.escapeChar = function(c) {\n  if (c in goog.string.jsEscapeCache_) {\n    return goog.string.jsEscapeCache_[c];\n  }\n\n  if (c in goog.string.specialEscapeChars_) {\n    return goog.string.jsEscapeCache_[c] = goog.string.specialEscapeChars_[c];\n  }\n\n  var rv = c;\n  var cc = c.charCodeAt(0);\n  if (cc > 31 && cc < 127) {\n    rv = c;\n  } else {\n    // tab is 9 but handled above\n    if (cc < 256) {\n      rv = '\\\\x';\n      if (cc < 16 || cc > 256) {\n        rv += '0';\n      }\n    } else {\n      rv = '\\\\u';\n      if (cc < 4096) {  // \\u1000\n        rv += '0';\n      }\n    }\n    rv += cc.toString(16).toUpperCase();\n  }\n\n  return goog.string.jsEscapeCache_[c] = rv;\n};\n\n\n/**\n * Determines whether a string contains a substring.\n * @param {string} str The string to search.\n * @param {string} subString The substring to search for.\n * @return {boolean} Whether `str` contains `subString`.\n */\ngoog.string.contains = goog.string.internal.contains;\n\n\n/**\n * Determines whether a string contains a substring, ignoring case.\n * @param {string} str The string to search.\n * @param {string} subString The substring to search for.\n * @return {boolean} Whether `str` contains `subString`.\n */\ngoog.string.caseInsensitiveContains =\n    goog.string.internal.caseInsensitiveContains;\n\n\n/**\n * Returns the non-overlapping occurrences of ss in s.\n * If either s or ss evalutes to false, then returns zero.\n * @param {string} s The string to look in.\n * @param {string} ss The string to look for.\n * @return {number} Number of occurrences of ss in s.\n */\ngoog.string.countOf = function(s, ss) {\n  return s && ss ? s.split(ss).length - 1 : 0;\n};\n\n\n/**\n * Removes a substring of a specified length at a specific\n * index in a string.\n * @param {string} s The base string from which to remove.\n * @param {number} index The index at which to remove the substring.\n * @param {number} stringLength The length of the substring to remove.\n * @return {string} A copy of `s` with the substring removed or the full\n *     string if nothing is removed or the input is invalid.\n */\ngoog.string.removeAt = function(s, index, stringLength) {\n  var resultStr = s;\n  // If the index is greater or equal to 0 then remove substring\n  if (index >= 0 && index < s.length && stringLength > 0) {\n    resultStr = s.substr(0, index) +\n        s.substr(index + stringLength, s.length - index - stringLength);\n  }\n  return resultStr;\n};\n\n\n/**\n * Removes the first occurrence of a substring from a string.\n * @param {string} str The base string from which to remove.\n * @param {string} substr The string to remove.\n * @return {string} A copy of `str` with `substr` removed or the\n *     full string if nothing is removed.\n */\ngoog.string.remove = function(str, substr) {\n  return str.replace(substr, '');\n};\n\n\n/**\n *  Removes all occurrences of a substring from a string.\n *  @param {string} s The base string from which to remove.\n *  @param {string} ss The string to remove.\n *  @return {string} A copy of `s` with `ss` removed or the full\n *      string if nothing is removed.\n */\ngoog.string.removeAll = function(s, ss) {\n  var re = new RegExp(goog.string.regExpEscape(ss), 'g');\n  return s.replace(re, '');\n};\n\n\n/**\n *  Replaces all occurrences of a substring of a string with a new substring.\n *  @param {string} s The base string from which to remove.\n *  @param {string} ss The string to replace.\n *  @param {string} replacement The replacement string.\n *  @return {string} A copy of `s` with `ss` replaced by\n *      `replacement` or the original string if nothing is replaced.\n */\ngoog.string.replaceAll = function(s, ss, replacement) {\n  var re = new RegExp(goog.string.regExpEscape(ss), 'g');\n  return s.replace(re, replacement.replace(/\\$/g, '$$$$'));\n};\n\n\n/**\n * Escapes characters in the string that are not safe to use in a RegExp.\n * @param {*} s The string to escape. If not a string, it will be casted\n *     to one.\n * @return {string} A RegExp safe, escaped copy of `s`.\n */\ngoog.string.regExpEscape = function(s) {\n  return String(s)\n      .replace(/([-()\\[\\]{}+?*.$\\^|,:#<!\\\\])/g, '\\\\$1')\n      .replace(/\\x08/g, '\\\\x08');\n};\n\n\n/**\n * Repeats a string n times.\n * @param {string} string The string to repeat.\n * @param {number} length The number of times to repeat.\n * @return {string} A string containing `length` repetitions of\n *     `string`.\n */\ngoog.string.repeat = (String.prototype.repeat) ? function(string, length) {\n  // The native method is over 100 times faster than the alternative.\n  return string.repeat(length);\n} : function(string, length) {\n  return new Array(length + 1).join(string);\n};\n\n\n/**\n * Pads number to given length and optionally rounds it to a given precision.\n * For example:\n * <pre>padNumber(1.25, 2, 3) -> '01.250'\n * padNumber(1.25, 2) -> '01.25'\n * padNumber(1.25, 2, 1) -> '01.3'\n * padNumber(1.25, 0) -> '1.25'</pre>\n *\n * @param {number} num The number to pad.\n * @param {number} length The desired length.\n * @param {number=} opt_precision The desired precision.\n * @return {string} `num` as a string with the given options.\n */\ngoog.string.padNumber = function(num, length, opt_precision) {\n  var s =\n      (opt_precision !== undefined) ? num.toFixed(opt_precision) : String(num);\n  var index = s.indexOf('.');\n  if (index == -1) {\n    index = s.length;\n  }\n  return goog.string.repeat('0', Math.max(0, length - index)) + s;\n};\n\n\n/**\n * Returns a string representation of the given object, with\n * null and undefined being returned as the empty string.\n *\n * @param {*} obj The object to convert.\n * @return {string} A string representation of the `obj`.\n */\ngoog.string.makeSafe = function(obj) {\n  return obj == null ? '' : String(obj);\n};\n\n\n/**\n * Concatenates string expressions. This is useful\n * since some browsers are very inefficient when it comes to using plus to\n * concat strings. Be careful when using null and undefined here since\n * these will not be included in the result. If you need to represent these\n * be sure to cast the argument to a String first.\n * For example:\n * <pre>buildString('a', 'b', 'c', 'd') -> 'abcd'\n * buildString(null, undefined) -> ''\n * </pre>\n * @param {...*} var_args A list of strings to concatenate. If not a string,\n *     it will be casted to one.\n * @return {string} The concatenation of `var_args`.\n */\ngoog.string.buildString = function(var_args) {\n  return Array.prototype.join.call(arguments, '');\n};\n\n\n/**\n * Returns a string with at least 64-bits of randomness.\n *\n * Doesn't trust JavaScript's random function entirely. Uses a combination of\n * random and current timestamp, and then encodes the string in base-36 to\n * make it shorter.\n *\n * @return {string} A random string, e.g. sn1s7vb4gcic.\n */\ngoog.string.getRandomString = function() {\n  var x = 2147483648;\n  return Math.floor(Math.random() * x).toString(36) +\n      Math.abs(Math.floor(Math.random() * x) ^ goog.now()).toString(36);\n};\n\n\n/**\n * Compares two version numbers.\n *\n * @param {string|number} version1 Version of first item.\n * @param {string|number} version2 Version of second item.\n *\n * @return {number}  1 if `version1` is higher.\n *                   0 if arguments are equal.\n *                  -1 if `version2` is higher.\n */\ngoog.string.compareVersions = goog.string.internal.compareVersions;\n\n\n/**\n * String hash function similar to java.lang.String.hashCode().\n * The hash code for a string is computed as\n * s[0] * 31 ^ (n - 1) + s[1] * 31 ^ (n - 2) + ... + s[n - 1],\n * where s[i] is the ith character of the string and n is the length of\n * the string. We mod the result to make it between 0 (inclusive) and 2^32\n * (exclusive).\n * @param {string} str A string.\n * @return {number} Hash value for `str`, between 0 (inclusive) and 2^32\n *  (exclusive). The empty string returns 0.\n */\ngoog.string.hashCode = function(str) {\n  var result = 0;\n  for (var i = 0; i < str.length; ++i) {\n    // Normalize to 4 byte range, 0 ... 2^32.\n    result = (31 * result + str.charCodeAt(i)) >>> 0;\n  }\n  return result;\n};\n\n\n/**\n * The most recent unique ID. |0 is equivalent to Math.floor in this case.\n * @type {number}\n * @private\n */\ngoog.string.uniqueStringCounter_ = Math.random() * 0x80000000 | 0;\n\n\n/**\n * Generates and returns a string which is unique in the current document.\n * This is useful, for example, to create unique IDs for DOM elements.\n * @return {string} A unique id.\n */\ngoog.string.createUniqueString = function() {\n  return 'goog_' + goog.string.uniqueStringCounter_++;\n};\n\n\n/**\n * Converts the supplied string to a number, which may be Infinity or NaN.\n * This function strips whitespace: (toNumber(' 123') === 123)\n * This function accepts scientific notation: (toNumber('1e1') === 10)\n *\n * This is better than JavaScript's built-in conversions because, sadly:\n *     (Number(' ') === 0) and (parseFloat('123a') === 123)\n *\n * @param {string} str The string to convert.\n * @return {number} The number the supplied string represents, or NaN.\n */\ngoog.string.toNumber = function(str) {\n  var num = Number(str);\n  if (num == 0 && goog.string.isEmptyOrWhitespace(str)) {\n    return NaN;\n  }\n  return num;\n};\n\n\n/**\n * Returns whether the given string is lower camel case (e.g. \"isFooBar\").\n *\n * Note that this assumes the string is entirely letters.\n * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms\n *\n * @param {string} str String to test.\n * @return {boolean} Whether the string is lower camel case.\n */\ngoog.string.isLowerCamelCase = function(str) {\n  return /^[a-z]+([A-Z][a-z]*)*$/.test(str);\n};\n\n\n/**\n * Returns whether the given string is upper camel case (e.g. \"FooBarBaz\").\n *\n * Note that this assumes the string is entirely letters.\n * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms\n *\n * @param {string} str String to test.\n * @return {boolean} Whether the string is upper camel case.\n */\ngoog.string.isUpperCamelCase = function(str) {\n  return /^([A-Z][a-z]*)+$/.test(str);\n};\n\n\n/**\n * Converts a string from selector-case to camelCase (e.g. from\n * \"multi-part-string\" to \"multiPartString\"), useful for converting\n * CSS selectors and HTML dataset keys to their equivalent JS properties.\n * @param {string} str The string in selector-case form.\n * @return {string} The string in camelCase form.\n */\ngoog.string.toCamelCase = function(str) {\n  return String(str).replace(/\\-([a-z])/g, function(all, match) {\n    return match.toUpperCase();\n  });\n};\n\n\n/**\n * Converts a string from camelCase to selector-case (e.g. from\n * \"multiPartString\" to \"multi-part-string\"), useful for converting JS\n * style and dataset properties to equivalent CSS selectors and HTML keys.\n * @param {string} str The string in camelCase form.\n * @return {string} The string in selector-case form.\n */\ngoog.string.toSelectorCase = function(str) {\n  return String(str).replace(/([A-Z])/g, '-$1').toLowerCase();\n};\n\n\n/**\n * Converts a string into TitleCase. First character of the string is always\n * capitalized in addition to the first letter of every subsequent word.\n * Words are delimited by one or more whitespaces by default. Custom delimiters\n * can optionally be specified to replace the default, which doesn't preserve\n * whitespace delimiters and instead must be explicitly included if needed.\n *\n * Default delimiter => \" \":\n *    goog.string.toTitleCase('oneTwoThree')    => 'OneTwoThree'\n *    goog.string.toTitleCase('one two three')  => 'One Two Three'\n *    goog.string.toTitleCase('  one   two   ') => '  One   Two   '\n *    goog.string.toTitleCase('one_two_three')  => 'One_two_three'\n *    goog.string.toTitleCase('one-two-three')  => 'One-two-three'\n *\n * Custom delimiter => \"_-.\":\n *    goog.string.toTitleCase('oneTwoThree', '_-.')       => 'OneTwoThree'\n *    goog.string.toTitleCase('one two three', '_-.')     => 'One two three'\n *    goog.string.toTitleCase('  one   two   ', '_-.')    => '  one   two   '\n *    goog.string.toTitleCase('one_two_three', '_-.')     => 'One_Two_Three'\n *    goog.string.toTitleCase('one-two-three', '_-.')     => 'One-Two-Three'\n *    goog.string.toTitleCase('one...two...three', '_-.') => 'One...Two...Three'\n *    goog.string.toTitleCase('one. two. three', '_-.')   => 'One. two. three'\n *    goog.string.toTitleCase('one-two.three', '_-.')     => 'One-Two.Three'\n *\n * @param {string} str String value in camelCase form.\n * @param {string=} opt_delimiters Custom delimiter character set used to\n *      distinguish words in the string value. Each character represents a\n *      single delimiter. When provided, default whitespace delimiter is\n *      overridden and must be explicitly included if needed.\n * @return {string} String value in TitleCase form.\n */\ngoog.string.toTitleCase = function(str, opt_delimiters) {\n  var delimiters = (typeof opt_delimiters === 'string') ?\n      goog.string.regExpEscape(opt_delimiters) :\n      '\\\\s';\n\n  // For IE8, we need to prevent using an empty character set. Otherwise,\n  // incorrect matching will occur.\n  delimiters = delimiters ? '|[' + delimiters + ']+' : '';\n\n  var regexp = new RegExp('(^' + delimiters + ')([a-z])', 'g');\n  return str.replace(regexp, function(all, p1, p2) {\n    return p1 + p2.toUpperCase();\n  });\n};\n\n\n/**\n * Capitalizes a string, i.e. converts the first letter to uppercase\n * and all other letters to lowercase, e.g.:\n *\n * goog.string.capitalize('one')     => 'One'\n * goog.string.capitalize('ONE')     => 'One'\n * goog.string.capitalize('one two') => 'One two'\n *\n * Note that this function does not trim initial whitespace.\n *\n * @param {string} str String value to capitalize.\n * @return {string} String value with first letter in uppercase.\n */\ngoog.string.capitalize = function(str) {\n  return String(str.charAt(0)).toUpperCase() +\n      String(str.substr(1)).toLowerCase();\n};\n\n\n/**\n * Parse a string in decimal or hexidecimal ('0xFFFF') form.\n *\n * To parse a particular radix, please use parseInt(string, radix) directly. See\n * https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/parseInt\n *\n * This is a wrapper for the built-in parseInt function that will only parse\n * numbers as base 10 or base 16.  Some JS implementations assume strings\n * starting with \"0\" are intended to be octal. ES3 allowed but discouraged\n * this behavior. ES5 forbids it.  This function emulates the ES5 behavior.\n *\n * For more information, see Mozilla JS Reference: http://goo.gl/8RiFj\n *\n * @param {string|number|null|undefined} value The value to be parsed.\n * @return {number} The number, parsed. If the string failed to parse, this\n *     will be NaN.\n */\ngoog.string.parseInt = function(value) {\n  // Force finite numbers to strings.\n  if (isFinite(value)) {\n    value = String(value);\n  }\n\n  if (typeof value === 'string') {\n    // If the string starts with '0x' or '-0x', parse as hex.\n    return /^\\s*-?0x/i.test(value) ? parseInt(value, 16) : parseInt(value, 10);\n  }\n\n  return NaN;\n};\n\n\n/**\n * Splits a string on a separator a limited number of times.\n *\n * This implementation is more similar to Python or Java, where the limit\n * parameter specifies the maximum number of splits rather than truncating\n * the number of results.\n *\n * See http://docs.python.org/2/library/stdtypes.html#str.split\n * See JavaDoc: http://goo.gl/F2AsY\n * See Mozilla reference: http://goo.gl/dZdZs\n *\n * @param {string} str String to split.\n * @param {string} separator The separator.\n * @param {number} limit The limit to the number of splits. The resulting array\n *     will have a maximum length of limit+1.  Negative numbers are the same\n *     as zero.\n * @return {!Array<string>} The string, split.\n */\ngoog.string.splitLimit = function(str, separator, limit) {\n  var parts = str.split(separator);\n  var returnVal = [];\n\n  // Only continue doing this while we haven't hit the limit and we have\n  // parts left.\n  while (limit > 0 && parts.length) {\n    returnVal.push(parts.shift());\n    limit--;\n  }\n\n  // If there are remaining parts, append them to the end.\n  if (parts.length) {\n    returnVal.push(parts.join(separator));\n  }\n\n  return returnVal;\n};\n\n\n/**\n * Finds the characters to the right of the last instance of any separator\n *\n * This function is similar to goog.string.path.baseName, except it can take a\n * list of characters to split the string on. It will return the rightmost\n * grouping of characters to the right of any separator as a left-to-right\n * oriented string.\n *\n * @see goog.string.path.baseName\n * @param {string} str The string\n * @param {string|!Array<string>} separators A list of separator characters\n * @return {string} The last part of the string with respect to the separators\n */\ngoog.string.lastComponent = function(str, separators) {\n  if (!separators) {\n    return str;\n  } else if (typeof separators == 'string') {\n    separators = [separators];\n  }\n\n  var lastSeparatorIndex = -1;\n  for (var i = 0; i < separators.length; i++) {\n    if (separators[i] == '') {\n      continue;\n    }\n    var currentSeparatorIndex = str.lastIndexOf(separators[i]);\n    if (currentSeparatorIndex > lastSeparatorIndex) {\n      lastSeparatorIndex = currentSeparatorIndex;\n    }\n  }\n  if (lastSeparatorIndex == -1) {\n    return str;\n  }\n  return str.slice(lastSeparatorIndex + 1);\n};\n\n\n/**\n * Computes the Levenshtein edit distance between two strings.\n * @param {string} a\n * @param {string} b\n * @return {number} The edit distance between the two strings.\n */\ngoog.string.editDistance = function(a, b) {\n  var v0 = [];\n  var v1 = [];\n\n  if (a == b) {\n    return 0;\n  }\n\n  if (!a.length || !b.length) {\n    return Math.max(a.length, b.length);\n  }\n\n  for (var i = 0; i < b.length + 1; i++) {\n    v0[i] = i;\n  }\n\n  for (var i = 0; i < a.length; i++) {\n    v1[0] = i + 1;\n\n    for (var j = 0; j < b.length; j++) {\n      var cost = Number(a[i] != b[j]);\n      // Cost for the substring is the minimum of adding one character, removing\n      // one character, or a swap.\n      v1[j + 1] = Math.min(v1[j] + 1, v0[j + 1] + 1, v0[j] + cost);\n    }\n\n    for (var j = 0; j < v0.length; j++) {\n      v0[j] = v1[j];\n    }\n  }\n\n  return v1[b.length];\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Wrapper class for handling XmlHttpRequests.\n *\n * One off requests can be sent through goog.net.XhrIo.send() or an\n * instance can be created to send multiple requests.  Each request uses its\n * own XmlHttpRequest object and handles clearing of the event callback to\n * ensure no leaks.\n *\n * XhrIo is event based, it dispatches events on success, failure, finishing,\n * ready-state change, or progress (download and upload).\n *\n * The ready-state or timeout event fires first, followed by\n * a generic completed event. Then the abort, error, or success event\n * is fired as appropriate. Progress events are fired as they are\n * received. Lastly, the ready event will fire to indicate that the\n * object may be used to make another request.\n *\n * The error event may also be called before completed and\n * ready-state-change if the XmlHttpRequest.open() or .send() methods throw.\n *\n * This class does not support multiple requests, queuing, or prioritization.\n *\n * When progress events are supported by the browser, and progress is\n * enabled via .setProgressEventsEnabled(true), the\n * goog.net.EventType.PROGRESS event will be the re-dispatched browser\n * progress event. Additionally, a DOWNLOAD_PROGRESS or UPLOAD_PROGRESS event\n * will be fired for download and upload progress respectively.\n */\n\n\ngoog.provide('goog.net.XhrIo');\ngoog.provide('goog.net.XhrIo.ResponseType');\n\ngoog.require('goog.Timer');\ngoog.require('goog.array');\ngoog.require('goog.asserts');\ngoog.require('goog.debug.entryPointRegistry');\ngoog.require('goog.events.EventTarget');\ngoog.require('goog.json.hybrid');\ngoog.require('goog.log');\ngoog.require('goog.net.ErrorCode');\ngoog.require('goog.net.EventType');\ngoog.require('goog.net.HttpStatus');\ngoog.require('goog.net.XmlHttp');\ngoog.require('goog.object');\ngoog.require('goog.string');\ngoog.require('goog.structs');\ngoog.require('goog.structs.Map');\ngoog.require('goog.uri.utils');\ngoog.require('goog.userAgent');\ngoog.requireType('goog.Uri');\n\ngoog.scope(function() {\n\n/**\n * Basic class for handling XMLHttpRequests.\n * @param {goog.net.XmlHttpFactory=} opt_xmlHttpFactory Factory to use when\n *     creating XMLHttpRequest objects.\n * @constructor\n * @extends {goog.events.EventTarget}\n */\ngoog.net.XhrIo = function(opt_xmlHttpFactory) {\n  XhrIo.base(this, 'constructor');\n\n  /**\n   * Map of default headers to add to every request, use:\n   * XhrIo.headers.set(name, value)\n   * @type {!goog.structs.Map}\n   */\n  this.headers = new goog.structs.Map();\n\n  /**\n   * Optional XmlHttpFactory\n   * @private {goog.net.XmlHttpFactory}\n   */\n  this.xmlHttpFactory_ = opt_xmlHttpFactory || null;\n\n  /**\n   * Whether XMLHttpRequest is active.  A request is active from the time send()\n   * is called until onReadyStateChange() is complete, or error() or abort()\n   * is called.\n   * @private {boolean}\n   */\n  this.active_ = false;\n\n  /**\n   * The XMLHttpRequest object that is being used for the transfer.\n   * @private {?goog.net.XhrLike.OrNative}\n   */\n  this.xhr_ = null;\n\n  /**\n   * The options to use with the current XMLHttpRequest object.\n   * @private {?Object}\n   */\n  this.xhrOptions_ = null;\n\n  /**\n   * Last URL that was requested.\n   * @private {string|goog.Uri}\n   */\n  this.lastUri_ = '';\n\n  /**\n   * Method for the last request.\n   * @private {string}\n   */\n  this.lastMethod_ = '';\n\n  /**\n   * Last error code.\n   * @private {!goog.net.ErrorCode}\n   */\n  this.lastErrorCode_ = goog.net.ErrorCode.NO_ERROR;\n\n  /**\n   * Last error message.\n   * @private {Error|string}\n   */\n  this.lastError_ = '';\n\n  /**\n   * Used to ensure that we don't dispatch an multiple ERROR events. This can\n   * happen in IE when it does a synchronous load and one error is handled in\n   * the ready statte change and one is handled due to send() throwing an\n   * exception.\n   * @private {boolean}\n   */\n  this.errorDispatched_ = false;\n\n  /**\n   * Used to make sure we don't fire the complete event from inside a send call.\n   * @private {boolean}\n   */\n  this.inSend_ = false;\n\n  /**\n   * Used in determining if a call to {@link #onReadyStateChange_} is from\n   * within a call to this.xhr_.open.\n   * @private {boolean}\n   */\n  this.inOpen_ = false;\n\n  /**\n   * Used in determining if a call to {@link #onReadyStateChange_} is from\n   * within a call to this.xhr_.abort.\n   * @private {boolean}\n   */\n  this.inAbort_ = false;\n\n  /**\n   * Number of milliseconds after which an incomplete request will be aborted\n   * and a {@link goog.net.EventType.TIMEOUT} event raised; 0 means no timeout\n   * is set.\n   * @private {number}\n   */\n  this.timeoutInterval_ = 0;\n\n  /**\n   * Timer to track request timeout.\n   * @private {?number}\n   */\n  this.timeoutId_ = null;\n\n  /**\n   * The requested type for the response. The empty string means use the default\n   * XHR behavior.\n   * @private {goog.net.XhrIo.ResponseType}\n   */\n  this.responseType_ = ResponseType.DEFAULT;\n\n  /**\n   * Whether a \"credentialed\" request is to be sent (one that is aware of\n   * cookies and authentication). This is applicable only for cross-domain\n   * requests and more recent browsers that support this part of the HTTP Access\n   * Control standard.\n   *\n   * @see http://www.w3.org/TR/XMLHttpRequest/#the-withcredentials-attribute\n   *\n   * @private {boolean}\n   */\n  this.withCredentials_ = false;\n\n  /**\n   * Whether progress events are enabled for this request. This is\n   * disabled by default because setting a progress event handler\n   * causes pre-flight OPTIONS requests to be sent for CORS requests,\n   * even in cases where a pre-flight request would not otherwise be\n   * sent.\n   *\n   * @see http://xhr.spec.whatwg.org/#security-considerations\n   *\n   * Note that this can cause problems for Firefox 22 and below, as an\n   * older \"LSProgressEvent\" will be dispatched by the browser. That\n   * progress event is no longer supported, and can lead to failures,\n   * including throwing exceptions.\n   *\n   * @see http://bugzilla.mozilla.org/show_bug.cgi?id=845631\n   * @see b/23469793\n   *\n   * @private {boolean}\n   */\n  this.progressEventsEnabled_ = false;\n\n  /**\n   * True if we can use XMLHttpRequest's timeout directly.\n   * @private {boolean}\n   */\n  this.useXhr2Timeout_ = false;\n};\ngoog.inherits(goog.net.XhrIo, goog.events.EventTarget);\n\nvar XhrIo = goog.net.XhrIo;\n\n/**\n * Response types that may be requested for XMLHttpRequests.\n * @enum {string}\n * @see http://www.w3.org/TR/XMLHttpRequest/#the-responsetype-attribute\n */\ngoog.net.XhrIo.ResponseType = {\n  DEFAULT: '',\n  TEXT: 'text',\n  DOCUMENT: 'document',\n  // Not supported as of Chrome 10.0.612.1 dev\n  BLOB: 'blob',\n  ARRAY_BUFFER: 'arraybuffer',\n};\n\nvar ResponseType = goog.net.XhrIo.ResponseType;\n\n\n/**\n * A reference to the XhrIo logger\n * @private {?goog.log.Logger}\n * @const\n */\ngoog.net.XhrIo.prototype.logger_ = goog.log.getLogger('goog.net.XhrIo');\n\n\n/**\n * The Content-Type HTTP header name\n * @type {string}\n */\ngoog.net.XhrIo.CONTENT_TYPE_HEADER = 'Content-Type';\n\n\n/**\n * The Content-Transfer-Encoding HTTP header name\n * @type {string}\n */\ngoog.net.XhrIo.CONTENT_TRANSFER_ENCODING = 'Content-Transfer-Encoding';\n\n\n/**\n * The pattern matching the 'http' and 'https' URI schemes\n * @type {!RegExp}\n */\ngoog.net.XhrIo.HTTP_SCHEME_PATTERN = /^https?$/i;\n\n\n/**\n * The methods that typically come along with form data.  We set different\n * headers depending on whether the HTTP action is one of these.\n * @type {!Array<string>}\n */\ngoog.net.XhrIo.METHODS_WITH_FORM_DATA = ['POST', 'PUT'];\n\n\n/**\n * The Content-Type HTTP header value for a url-encoded form\n * @type {string}\n */\ngoog.net.XhrIo.FORM_CONTENT_TYPE =\n    'application/x-www-form-urlencoded;charset=utf-8';\n\n\n/**\n * The XMLHttpRequest Level two timeout delay ms property name.\n *\n * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute\n *\n * @private {string}\n * @const\n */\ngoog.net.XhrIo.XHR2_TIMEOUT_ = 'timeout';\n\n\n/**\n * The XMLHttpRequest Level two ontimeout handler property name.\n *\n * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute\n *\n * @private {string}\n * @const\n */\ngoog.net.XhrIo.XHR2_ON_TIMEOUT_ = 'ontimeout';\n\n\n/**\n * All non-disposed instances of goog.net.XhrIo created\n * by {@link goog.net.XhrIo.send} are in this Array.\n * @see goog.net.XhrIo.cleanup\n * @private {!Array<!goog.net.XhrIo>}\n */\ngoog.net.XhrIo.sendInstances_ = [];\n\n\n/**\n * Static send that creates a short lived instance of XhrIo to send the\n * request.\n * @see goog.net.XhrIo.cleanup\n * @param {string|goog.Uri} url Uri to make request to.\n * @param {?function(this:goog.net.XhrIo, ?)=} opt_callback Callback function\n *     for when request is complete.\n * @param {string=} opt_method Send method, default: GET.\n * @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=}\n *     opt_content Body data.\n * @param {Object|goog.structs.Map=} opt_headers Map of headers to add to the\n *     request.\n * @param {number=} opt_timeoutInterval Number of milliseconds after which an\n *     incomplete request will be aborted; 0 means no timeout is set.\n * @param {boolean=} opt_withCredentials Whether to send credentials with the\n *     request. Default to false. See {@link goog.net.XhrIo#setWithCredentials}.\n * @return {!goog.net.XhrIo} The sent XhrIo.\n */\ngoog.net.XhrIo.send = function(\n    url, opt_callback, opt_method, opt_content, opt_headers,\n    opt_timeoutInterval, opt_withCredentials) {\n  var x = new goog.net.XhrIo();\n  goog.net.XhrIo.sendInstances_.push(x);\n  if (opt_callback) {\n    x.listen(goog.net.EventType.COMPLETE, opt_callback);\n  }\n  x.listenOnce(goog.net.EventType.READY, x.cleanupSend_);\n  if (opt_timeoutInterval) {\n    x.setTimeoutInterval(opt_timeoutInterval);\n  }\n  if (opt_withCredentials) {\n    x.setWithCredentials(opt_withCredentials);\n  }\n  x.send(url, opt_method, opt_content, opt_headers);\n  return x;\n};\n\n\n/**\n * Disposes all non-disposed instances of goog.net.XhrIo created by\n * {@link goog.net.XhrIo.send}.\n * {@link goog.net.XhrIo.send} cleans up the goog.net.XhrIo instance\n * it creates when the request completes or fails.  However, if\n * the request never completes, then the goog.net.XhrIo is not disposed.\n * This can occur if the window is unloaded before the request completes.\n * We could have {@link goog.net.XhrIo.send} return the goog.net.XhrIo\n * it creates and make the client of {@link goog.net.XhrIo.send} be\n * responsible for disposing it in this case.  However, this makes things\n * significantly more complicated for the client, and the whole point\n * of {@link goog.net.XhrIo.send} is that it's simple and easy to use.\n * Clients of {@link goog.net.XhrIo.send} should call\n * {@link goog.net.XhrIo.cleanup} when doing final\n * cleanup on window unload.\n */\ngoog.net.XhrIo.cleanup = function() {\n  var instances = goog.net.XhrIo.sendInstances_;\n  while (instances.length) {\n    instances.pop().dispose();\n  }\n};\n\n\n/**\n * Installs exception protection for all entry point introduced by\n * goog.net.XhrIo instances which are not protected by\n * {@link goog.debug.ErrorHandler#protectWindowSetTimeout},\n * {@link goog.debug.ErrorHandler#protectWindowSetInterval}, or\n * {@link goog.events.protectBrowserEventEntryPoint}.\n *\n * @param {goog.debug.ErrorHandler} errorHandler Error handler with which to\n *     protect the entry point(s).\n */\ngoog.net.XhrIo.protectEntryPoints = function(errorHandler) {\n  goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ =\n      errorHandler.protectEntryPoint(\n          goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_);\n};\n\n\n/**\n * Disposes of the specified goog.net.XhrIo created by\n * {@link goog.net.XhrIo.send} and removes it from\n * {@link goog.net.XhrIo.pendingStaticSendInstances_}.\n * @private\n */\ngoog.net.XhrIo.prototype.cleanupSend_ = function() {\n  this.dispose();\n  goog.array.remove(goog.net.XhrIo.sendInstances_, this);\n};\n\n\n/**\n * Returns the number of milliseconds after which an incomplete request will be\n * aborted, or 0 if no timeout is set.\n * @return {number} Timeout interval in milliseconds.\n */\ngoog.net.XhrIo.prototype.getTimeoutInterval = function() {\n  return this.timeoutInterval_;\n};\n\n\n/**\n * Sets the number of milliseconds after which an incomplete request will be\n * aborted and a {@link goog.net.EventType.TIMEOUT} event raised; 0 means no\n * timeout is set.\n * @param {number} ms Timeout interval in milliseconds; 0 means none.\n */\ngoog.net.XhrIo.prototype.setTimeoutInterval = function(ms) {\n  this.timeoutInterval_ = Math.max(0, ms);\n};\n\n\n/**\n * Sets the desired type for the response. At time of writing, this is only\n * supported in very recent versions of WebKit (10.0.612.1 dev and later).\n *\n * If this is used, the response may only be accessed via {@link #getResponse}.\n *\n * @param {goog.net.XhrIo.ResponseType} type The desired type for the response.\n */\ngoog.net.XhrIo.prototype.setResponseType = function(type) {\n  this.responseType_ = type;\n};\n\n\n/**\n * Gets the desired type for the response.\n * @return {goog.net.XhrIo.ResponseType} The desired type for the response.\n */\ngoog.net.XhrIo.prototype.getResponseType = function() {\n  return this.responseType_;\n};\n\n\n/**\n * Sets whether a \"credentialed\" request that is aware of cookie and\n * authentication information should be made. This option is only supported by\n * browsers that support HTTP Access Control. As of this writing, this option\n * is not supported in IE.\n *\n * @param {boolean} withCredentials Whether this should be a \"credentialed\"\n *     request.\n */\ngoog.net.XhrIo.prototype.setWithCredentials = function(withCredentials) {\n  this.withCredentials_ = withCredentials;\n};\n\n\n/**\n * Gets whether a \"credentialed\" request is to be sent.\n * @return {boolean} The desired type for the response.\n */\ngoog.net.XhrIo.prototype.getWithCredentials = function() {\n  return this.withCredentials_;\n};\n\n\n/**\n * Sets whether progress events are enabled for this request. Note\n * that progress events require pre-flight OPTIONS request handling\n * for CORS requests, and may cause trouble with older browsers. See\n * progressEventsEnabled_ for details.\n * @param {boolean} enabled Whether progress events should be enabled.\n */\ngoog.net.XhrIo.prototype.setProgressEventsEnabled = function(enabled) {\n  this.progressEventsEnabled_ = enabled;\n};\n\n\n/**\n * Gets whether progress events are enabled.\n * @return {boolean} Whether progress events are enabled for this request.\n */\ngoog.net.XhrIo.prototype.getProgressEventsEnabled = function() {\n  return this.progressEventsEnabled_;\n};\n\n\n/**\n * Instance send that actually uses XMLHttpRequest to make a server call.\n * @param {string|goog.Uri} url Uri to make request to.\n * @param {string=} opt_method Send method, default: GET.\n * @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=}\n *     opt_content Body data.\n * @param {Object|goog.structs.Map=} opt_headers Map of headers to add to the\n *     request.\n * @suppress {deprecated} Use deprecated goog.structs.forEach to allow different\n * types of parameters for opt_headers.\n */\ngoog.net.XhrIo.prototype.send = function(\n    url, opt_method, opt_content, opt_headers) {\n  if (this.xhr_) {\n    throw new Error(\n        '[goog.net.XhrIo] Object is active with another request=' +\n        this.lastUri_ + '; newUri=' + url);\n  }\n\n  var method = opt_method ? opt_method.toUpperCase() : 'GET';\n\n  this.lastUri_ = url;\n  this.lastError_ = '';\n  this.lastErrorCode_ = goog.net.ErrorCode.NO_ERROR;\n  this.lastMethod_ = method;\n  this.errorDispatched_ = false;\n  this.active_ = true;\n\n  // Use the factory to create the XHR object and options\n  this.xhr_ = this.createXhr();\n  this.xhrOptions_ = this.xmlHttpFactory_ ? this.xmlHttpFactory_.getOptions() :\n                                            goog.net.XmlHttp.getOptions();\n\n  // Set up the onreadystatechange callback\n  this.xhr_.onreadystatechange = goog.bind(this.onReadyStateChange_, this);\n\n  // Set up upload/download progress events, if progress events are supported.\n  if (this.getProgressEventsEnabled() && 'onprogress' in this.xhr_) {\n    this.xhr_.onprogress =\n        goog.bind(function(e) { this.onProgressHandler_(e, true); }, this);\n    if (this.xhr_.upload) {\n      this.xhr_.upload.onprogress = goog.bind(this.onProgressHandler_, this);\n    }\n  }\n\n  /**\n   * Try to open the XMLHttpRequest (always async), if an error occurs here it\n   * is generally permission denied\n   */\n  try {\n    goog.log.fine(this.logger_, this.formatMsg_('Opening Xhr'));\n    this.inOpen_ = true;\n    this.xhr_.open(method, String(url), true);  // Always async!\n    this.inOpen_ = false;\n  } catch (err) {\n    goog.log.fine(\n        this.logger_, this.formatMsg_('Error opening Xhr: ' + err.message));\n    this.error_(goog.net.ErrorCode.EXCEPTION, err);\n    return;\n  }\n\n  // We can't use null since this won't allow requests with form data to have a\n  // content length specified which will cause some proxies to return a 411\n  // error.\n  var content = opt_content || '';\n\n  var headers = this.headers.clone();\n\n  // Add headers specific to this request\n  if (opt_headers) {\n    goog.structs.forEach(\n        opt_headers, function(value, key) { headers.set(key, value); });\n  }\n\n  // Find whether a content type header is set, ignoring case.\n  // HTTP header names are case-insensitive.  See:\n  // http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2\n  var contentTypeKey =\n      goog.array.find(headers.getKeys(), goog.net.XhrIo.isContentTypeHeader_);\n\n  var contentIsFormData =\n      (goog.global['FormData'] && (content instanceof goog.global['FormData']));\n  if (goog.array.contains(goog.net.XhrIo.METHODS_WITH_FORM_DATA, method) &&\n      !contentTypeKey && !contentIsFormData) {\n    // For requests typically with form data, default to the url-encoded form\n    // content type unless this is a FormData request.  For FormData,\n    // the browser will automatically add a multipart/form-data content type\n    // with an appropriate multipart boundary.\n    headers.set(\n        goog.net.XhrIo.CONTENT_TYPE_HEADER, goog.net.XhrIo.FORM_CONTENT_TYPE);\n  }\n\n  // Add the headers to the Xhr object\n  headers.forEach(function(value, key) {\n    this.xhr_.setRequestHeader(key, value);\n  }, this);\n\n  if (this.responseType_) {\n    this.xhr_.responseType = this.responseType_;\n  }\n  // Set xhr_.withCredentials only when the value is different, or else in\n  // synchronous XMLHtppRequest.open Firefox will throw an exception.\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=736340\n  if ('withCredentials' in this.xhr_ &&\n      this.xhr_.withCredentials !== this.withCredentials_) {\n    this.xhr_.withCredentials = this.withCredentials_;\n  }\n\n  /**\n   * Try to send the request, or other wise report an error (404 not found).\n   */\n  try {\n    this.cleanUpTimeoutTimer_();  // Paranoid, should never be running.\n    if (this.timeoutInterval_ > 0) {\n      this.useXhr2Timeout_ = goog.net.XhrIo.shouldUseXhr2Timeout_(this.xhr_);\n      goog.log.fine(\n          this.logger_, this.formatMsg_(\n                            'Will abort after ' + this.timeoutInterval_ +\n                            'ms if incomplete, xhr2 ' + this.useXhr2Timeout_));\n      if (this.useXhr2Timeout_) {\n        this.xhr_[goog.net.XhrIo.XHR2_TIMEOUT_] = this.timeoutInterval_;\n        this.xhr_[goog.net.XhrIo.XHR2_ON_TIMEOUT_] =\n            goog.bind(this.timeout_, this);\n      } else {\n        this.timeoutId_ =\n            goog.Timer.callOnce(this.timeout_, this.timeoutInterval_, this);\n      }\n    }\n    goog.log.fine(this.logger_, this.formatMsg_('Sending request'));\n    this.inSend_ = true;\n    this.xhr_.send(content);\n    this.inSend_ = false;\n\n  } catch (err) {\n    goog.log.fine(this.logger_, this.formatMsg_('Send error: ' + err.message));\n    this.error_(goog.net.ErrorCode.EXCEPTION, err);\n  }\n};\n\n\n/**\n * Determines if the argument is an XMLHttpRequest that supports the level 2\n * timeout value and event.\n *\n * Currently, FF 21.0 OS X has the fields but won't actually call the timeout\n * handler.  Perhaps the confusion in the bug referenced below hasn't\n * entirely been resolved.\n *\n * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute\n * @see https://bugzilla.mozilla.org/show_bug.cgi?id=525816\n *\n * @param {!goog.net.XhrLike.OrNative} xhr The request.\n * @return {boolean} True if the request supports level 2 timeout.\n * @private\n */\ngoog.net.XhrIo.shouldUseXhr2Timeout_ = function(xhr) {\n  return goog.userAgent.IE && goog.userAgent.isVersionOrHigher(9) &&\n      typeof xhr[goog.net.XhrIo.XHR2_TIMEOUT_] === 'number' &&\n      xhr[goog.net.XhrIo.XHR2_ON_TIMEOUT_] !== undefined;\n};\n\n\n/**\n * @param {string} header An HTTP header key.\n * @return {boolean} Whether the key is a content type header (ignoring\n *     case.\n * @private\n */\ngoog.net.XhrIo.isContentTypeHeader_ = function(header) {\n  return goog.string.caseInsensitiveEquals(\n      goog.net.XhrIo.CONTENT_TYPE_HEADER, header);\n};\n\n\n/**\n * Creates a new XHR object.\n * @return {!goog.net.XhrLike.OrNative} The newly created XHR object.\n * @protected\n */\ngoog.net.XhrIo.prototype.createXhr = function() {\n  return this.xmlHttpFactory_ ? this.xmlHttpFactory_.createInstance() :\n                                goog.net.XmlHttp();\n};\n\n\n/**\n * The request didn't complete after {@link goog.net.XhrIo#timeoutInterval_}\n * milliseconds; raises a {@link goog.net.EventType.TIMEOUT} event and aborts\n * the request.\n * @private\n */\ngoog.net.XhrIo.prototype.timeout_ = function() {\n  if (typeof goog == 'undefined') {\n    // If goog is undefined then the callback has occurred as the application\n    // is unloading and will error.  Thus we let it silently fail.\n  } else if (this.xhr_) {\n    this.lastError_ =\n        'Timed out after ' + this.timeoutInterval_ + 'ms, aborting';\n    this.lastErrorCode_ = goog.net.ErrorCode.TIMEOUT;\n    goog.log.fine(this.logger_, this.formatMsg_(this.lastError_));\n    this.dispatchEvent(goog.net.EventType.TIMEOUT);\n    this.abort(goog.net.ErrorCode.TIMEOUT);\n  }\n};\n\n\n/**\n * Something errorred, so inactivate, fire error callback and clean up\n * @param {goog.net.ErrorCode} errorCode The error code.\n * @param {Error} err The error object.\n * @private\n */\ngoog.net.XhrIo.prototype.error_ = function(errorCode, err) {\n  this.active_ = false;\n  if (this.xhr_) {\n    this.inAbort_ = true;\n    this.xhr_.abort();  // Ensures XHR isn't hung (FF)\n    this.inAbort_ = false;\n  }\n  this.lastError_ = err;\n  this.lastErrorCode_ = errorCode;\n  this.dispatchErrors_();\n  this.cleanUpXhr_();\n};\n\n\n/**\n * Dispatches COMPLETE and ERROR in case of an error. This ensures that we do\n * not dispatch multiple error events.\n * @private\n */\ngoog.net.XhrIo.prototype.dispatchErrors_ = function() {\n  if (!this.errorDispatched_) {\n    this.errorDispatched_ = true;\n    this.dispatchEvent(goog.net.EventType.COMPLETE);\n    this.dispatchEvent(goog.net.EventType.ERROR);\n  }\n};\n\n\n/**\n * Abort the current XMLHttpRequest\n * @param {goog.net.ErrorCode=} opt_failureCode Optional error code to use -\n *     defaults to ABORT.\n */\ngoog.net.XhrIo.prototype.abort = function(opt_failureCode) {\n  if (this.xhr_ && this.active_) {\n    goog.log.fine(this.logger_, this.formatMsg_('Aborting'));\n    this.active_ = false;\n    this.inAbort_ = true;\n    this.xhr_.abort();\n    this.inAbort_ = false;\n    this.lastErrorCode_ = opt_failureCode || goog.net.ErrorCode.ABORT;\n    this.dispatchEvent(goog.net.EventType.COMPLETE);\n    this.dispatchEvent(goog.net.EventType.ABORT);\n    this.cleanUpXhr_();\n  }\n};\n\n\n/**\n * Nullifies all callbacks to reduce risks of leaks.\n * @override\n * @protected\n */\ngoog.net.XhrIo.prototype.disposeInternal = function() {\n  if (this.xhr_) {\n    // We explicitly do not call xhr_.abort() unless active_ is still true.\n    // This is to avoid unnecessarily aborting a successful request when\n    // dispose() is called in a callback triggered by a complete response, but\n    // in which browser cleanup has not yet finished.\n    // (See http://b/issue?id=1684217.)\n    if (this.active_) {\n      this.active_ = false;\n      this.inAbort_ = true;\n      this.xhr_.abort();\n      this.inAbort_ = false;\n    }\n    this.cleanUpXhr_(true);\n  }\n\n  XhrIo.base(this, 'disposeInternal');\n};\n\n\n/**\n * Internal handler for the XHR object's readystatechange event.  This method\n * checks the status and the readystate and fires the correct callbacks.\n * If the request has ended, the handlers are cleaned up and the XHR object is\n * nullified.\n * @private\n */\ngoog.net.XhrIo.prototype.onReadyStateChange_ = function() {\n  if (this.isDisposed()) {\n    // This method is the target of an untracked goog.Timer.callOnce().\n    return;\n  }\n  if (!this.inOpen_ && !this.inSend_ && !this.inAbort_) {\n    // Were not being called from within a call to this.xhr_.send\n    // this.xhr_.abort, or this.xhr_.open, so this is an entry point\n    this.onReadyStateChangeEntryPoint_();\n  } else {\n    this.onReadyStateChangeHelper_();\n  }\n};\n\n\n/**\n * Used to protect the onreadystatechange handler entry point.  Necessary\n * as {#onReadyStateChange_} maybe called from within send or abort, this\n * method is only called when {#onReadyStateChange_} is called as an\n * entry point.\n * {@see #protectEntryPoints}\n * @private\n */\ngoog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ = function() {\n  this.onReadyStateChangeHelper_();\n};\n\n\n/**\n * Helper for {@link #onReadyStateChange_}.  This is used so that\n * entry point calls to {@link #onReadyStateChange_} can be routed through\n * {@link #onReadyStateChangeEntryPoint_}.\n * @private\n */\ngoog.net.XhrIo.prototype.onReadyStateChangeHelper_ = function() {\n  if (!this.active_) {\n    // can get called inside abort call\n    return;\n  }\n\n  if (typeof goog == 'undefined') {\n    // NOTE(user): If goog is undefined then the callback has occurred as the\n    // application is unloading and will error.  Thus we let it silently fail.\n\n  } else if (\n      this.xhrOptions_[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] &&\n      this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE &&\n      this.getStatus() == 2) {\n    // NOTE(user): In IE if send() errors on a *local* request the readystate\n    // is still changed to COMPLETE.  We need to ignore it and allow the\n    // try/catch around send() to pick up the error.\n    goog.log.fine(\n        this.logger_,\n        this.formatMsg_('Local request error detected and ignored'));\n\n  } else {\n    // In IE when the response has been cached we sometimes get the callback\n    // from inside the send call and this usually breaks code that assumes that\n    // XhrIo is asynchronous.  If that is the case we delay the callback\n    // using a timer.\n    if (this.inSend_ &&\n        this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE) {\n      goog.Timer.callOnce(this.onReadyStateChange_, 0, this);\n      return;\n    }\n\n    this.dispatchEvent(goog.net.EventType.READY_STATE_CHANGE);\n\n    // readyState indicates the transfer has finished\n    if (this.isComplete()) {\n      goog.log.fine(this.logger_, this.formatMsg_('Request complete'));\n\n      this.active_ = false;\n\n      try {\n        // Call the specific callbacks for success or failure. Only call the\n        // success if the status is 200 (HTTP_OK) or 304 (HTTP_CACHED)\n        if (this.isSuccess()) {\n          this.dispatchEvent(goog.net.EventType.COMPLETE);\n          this.dispatchEvent(goog.net.EventType.SUCCESS);\n        } else {\n          this.lastErrorCode_ = goog.net.ErrorCode.HTTP_ERROR;\n          this.lastError_ =\n              this.getStatusText() + ' [' + this.getStatus() + ']';\n          this.dispatchErrors_();\n        }\n      } finally {\n        this.cleanUpXhr_();\n      }\n    }\n  }\n};\n\n\n/**\n * Internal handler for the XHR object's onprogress event. Fires both a generic\n * PROGRESS event and either a DOWNLOAD_PROGRESS or UPLOAD_PROGRESS event to\n * allow specific binding for each XHR progress event.\n * @param {!ProgressEvent} e XHR progress event.\n * @param {boolean=} opt_isDownload Whether the current progress event is from a\n *     download. Used to determine whether DOWNLOAD_PROGRESS or UPLOAD_PROGRESS\n *     event should be dispatched.\n * @private\n */\ngoog.net.XhrIo.prototype.onProgressHandler_ = function(e, opt_isDownload) {\n  goog.asserts.assert(\n      e.type === goog.net.EventType.PROGRESS,\n      'goog.net.EventType.PROGRESS is of the same type as raw XHR progress.');\n  this.dispatchEvent(\n      goog.net.XhrIo.buildProgressEvent_(e, goog.net.EventType.PROGRESS));\n  this.dispatchEvent(\n      goog.net.XhrIo.buildProgressEvent_(\n          e, opt_isDownload ? goog.net.EventType.DOWNLOAD_PROGRESS :\n                              goog.net.EventType.UPLOAD_PROGRESS));\n};\n\n\n/**\n * Creates a representation of the native ProgressEvent. IE doesn't support\n * constructing ProgressEvent via \"new\", and the alternatives (e.g.,\n * ProgressEvent.initProgressEvent) are non-standard or deprecated.\n * @param {!ProgressEvent} e XHR progress event.\n * @param {!goog.net.EventType} eventType The type of the event.\n * @return {!ProgressEvent} The progress event.\n * @private\n */\ngoog.net.XhrIo.buildProgressEvent_ = function(e, eventType) {\n  return /** @type {!ProgressEvent} */ ({\n    type: eventType,\n    lengthComputable: e.lengthComputable,\n    loaded: e.loaded,\n    total: e.total,\n  });\n};\n\n\n/**\n * Remove the listener to protect against leaks, and nullify the XMLHttpRequest\n * object.\n * @param {boolean=} opt_fromDispose If this is from the dispose (don't want to\n *     fire any events).\n * @private\n */\ngoog.net.XhrIo.prototype.cleanUpXhr_ = function(opt_fromDispose) {\n  if (this.xhr_) {\n    // Cancel any pending timeout event handler.\n    this.cleanUpTimeoutTimer_();\n\n    // Save reference so we can mark it as closed after the READY event.  The\n    // READY event may trigger another request, thus we must nullify this.xhr_\n    var xhr = this.xhr_;\n    var clearedOnReadyStateChange =\n        this.xhrOptions_[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] ?\n        goog.nullFunction :\n        null;\n    this.xhr_ = null;\n    this.xhrOptions_ = null;\n\n    if (!opt_fromDispose) {\n      this.dispatchEvent(goog.net.EventType.READY);\n    }\n\n    try {\n      // NOTE(user): Not nullifying in FireFox can still leak if the callbacks\n      // are defined in the same scope as the instance of XhrIo. But, IE doesn't\n      // allow you to set the onreadystatechange to NULL so nullFunction is\n      // used.\n      xhr.onreadystatechange = clearedOnReadyStateChange;\n    } catch (e) {\n      // This seems to occur with a Gears HTTP request. Delayed the setting of\n      // this onreadystatechange until after READY is sent out and catching the\n      // error to see if we can track down the problem.\n      goog.log.error(\n          this.logger_,\n          'Problem encountered resetting onreadystatechange: ' + e.message);\n    }\n  }\n};\n\n\n/**\n * Make sure the timeout timer isn't running.\n * @private\n */\ngoog.net.XhrIo.prototype.cleanUpTimeoutTimer_ = function() {\n  if (this.xhr_ && this.useXhr2Timeout_) {\n    this.xhr_[goog.net.XhrIo.XHR2_ON_TIMEOUT_] = null;\n  }\n  if (this.timeoutId_) {\n    goog.Timer.clear(this.timeoutId_);\n    this.timeoutId_ = null;\n  }\n};\n\n\n/**\n * @return {boolean} Whether there is an active request.\n */\ngoog.net.XhrIo.prototype.isActive = function() {\n  return !!this.xhr_;\n};\n\n\n/**\n * @return {boolean} Whether the request has completed.\n */\ngoog.net.XhrIo.prototype.isComplete = function() {\n  return this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE;\n};\n\n\n/**\n * @return {boolean} Whether the request completed with a success.\n */\ngoog.net.XhrIo.prototype.isSuccess = function() {\n  var status = this.getStatus();\n  // A zero status code is considered successful for local files.\n  return goog.net.HttpStatus.isSuccess(status) ||\n      status === 0 && !this.isLastUriEffectiveSchemeHttp_();\n};\n\n\n/**\n * @return {boolean} whether the effective scheme of the last URI that was\n *     fetched was 'http' or 'https'.\n * @private\n */\ngoog.net.XhrIo.prototype.isLastUriEffectiveSchemeHttp_ = function() {\n  var scheme = goog.uri.utils.getEffectiveScheme(String(this.lastUri_));\n  return goog.net.XhrIo.HTTP_SCHEME_PATTERN.test(scheme);\n};\n\n\n/**\n * Get the readystate from the Xhr object\n * Will only return correct result when called from the context of a callback\n * @return {goog.net.XmlHttp.ReadyState} goog.net.XmlHttp.ReadyState.*.\n */\ngoog.net.XhrIo.prototype.getReadyState = function() {\n  return this.xhr_ ?\n      /** @type {goog.net.XmlHttp.ReadyState} */ (this.xhr_.readyState) :\n                                                 goog.net.XmlHttp.ReadyState\n                                                     .UNINITIALIZED;\n};\n\n\n/**\n * Get the status from the Xhr object\n * Will only return correct result when called from the context of a callback\n * @return {number} Http status.\n */\ngoog.net.XhrIo.prototype.getStatus = function() {\n  /**\n   * IE doesn't like you checking status until the readystate is greater than 2\n   * (i.e. it is receiving or complete).  The try/catch is used for when the\n   * page is unloading and an ERROR_NOT_AVAILABLE may occur when accessing xhr_.\n   */\n  try {\n    return this.getReadyState() > goog.net.XmlHttp.ReadyState.LOADED ?\n        this.xhr_.status :\n        -1;\n  } catch (e) {\n    return -1;\n  }\n};\n\n\n/**\n * Get the status text from the Xhr object\n * Will only return correct result when called from the context of a callback\n * @return {string} Status text.\n */\ngoog.net.XhrIo.prototype.getStatusText = function() {\n  /**\n   * IE doesn't like you checking status until the readystate is greater than 2\n   * (i.e. it is receiving or complete).  The try/catch is used for when the\n   * page is unloading and an ERROR_NOT_AVAILABLE may occur when accessing xhr_.\n   */\n  try {\n    return this.getReadyState() > goog.net.XmlHttp.ReadyState.LOADED ?\n        this.xhr_.statusText :\n        '';\n  } catch (e) {\n    goog.log.fine(this.logger_, 'Can not get status: ' + e.message);\n    return '';\n  }\n};\n\n\n/**\n * Get the last Uri that was requested\n * @return {string} Last Uri.\n */\ngoog.net.XhrIo.prototype.getLastUri = function() {\n  return String(this.lastUri_);\n};\n\n\n/**\n * Get the response text from the Xhr object\n * Will only return correct result when called from the context of a callback.\n * @return {string} Result from the server, or '' if no result available.\n */\ngoog.net.XhrIo.prototype.getResponseText = function() {\n  try {\n    return this.xhr_ ? this.xhr_.responseText : '';\n  } catch (e) {\n    // http://www.w3.org/TR/XMLHttpRequest/#the-responsetext-attribute\n    // states that responseText should return '' (and responseXML null)\n    // when the state is not LOADING or DONE. Instead, IE can\n    // throw unexpected exceptions, for example when a request is aborted\n    // or no data is available yet.\n    goog.log.fine(this.logger_, 'Can not get responseText: ' + e.message);\n    return '';\n  }\n};\n\n\n/**\n * Get the response body from the Xhr object. This property is only available\n * in IE since version 7 according to MSDN:\n * http://msdn.microsoft.com/en-us/library/ie/ms534368(v=vs.85).aspx\n * Will only return correct result when called from the context of a callback.\n *\n * One option is to construct a VBArray from the returned object and convert\n * it to a JavaScript array using the toArray method:\n * `(new window['VBArray'](xhrIo.getResponseBody())).toArray()`\n * This will result in an array of numbers in the range of [0..255]\n *\n * Another option is to use the VBScript CStr method to convert it into a\n * string as outlined in http://stackoverflow.com/questions/1919972\n *\n * @return {Object} Binary result from the server or null if not available.\n */\ngoog.net.XhrIo.prototype.getResponseBody = function() {\n  try {\n    if (this.xhr_ && 'responseBody' in this.xhr_) {\n      return this.xhr_['responseBody'];\n    }\n  } catch (e) {\n    // IE can throw unexpected exceptions, for example when a request is aborted\n    // or no data is yet available.\n    goog.log.fine(this.logger_, 'Can not get responseBody: ' + e.message);\n  }\n  return null;\n};\n\n\n/**\n * Get the response XML from the Xhr object\n * Will only return correct result when called from the context of a callback.\n * @return {Document} The DOM Document representing the XML file, or null\n * if no result available.\n */\ngoog.net.XhrIo.prototype.getResponseXml = function() {\n  try {\n    return this.xhr_ ? this.xhr_.responseXML : null;\n  } catch (e) {\n    goog.log.fine(this.logger_, 'Can not get responseXML: ' + e.message);\n    return null;\n  }\n};\n\n\n/**\n * Get the response and evaluates it as JSON from the Xhr object\n * Will only return correct result when called from the context of a callback\n * @param {string=} opt_xssiPrefix Optional XSSI prefix string to use for\n *     stripping of the response before parsing. This needs to be set only if\n *     your backend server prepends the same prefix string to the JSON response.\n * @throws Error if the response text is invalid JSON.\n * @return {Object|undefined} JavaScript object.\n */\ngoog.net.XhrIo.prototype.getResponseJson = function(opt_xssiPrefix) {\n  if (!this.xhr_) {\n    return undefined;\n  }\n\n  var responseText = this.xhr_.responseText;\n  if (opt_xssiPrefix && responseText.indexOf(opt_xssiPrefix) == 0) {\n    responseText = responseText.substring(opt_xssiPrefix.length);\n  }\n\n  return goog.json.hybrid.parse(responseText);\n};\n\n\n/**\n * Get the response as the type specificed by {@link #setResponseType}. At time\n * of writing, this is only directly supported in very recent versions of WebKit\n * (10.0.612.1 dev and later). If the field is not supported directly, we will\n * try to emulate it.\n *\n * Emulating the response means following the rules laid out at\n * http://www.w3.org/TR/XMLHttpRequest/#the-response-attribute\n *\n * On browsers with no support for this (Chrome < 10, Firefox < 4, etc), only\n * response types of DEFAULT or TEXT may be used, and the response returned will\n * be the text response.\n *\n * On browsers with Mozilla's draft support for array buffers (Firefox 4, 5),\n * only response types of DEFAULT, TEXT, and ARRAY_BUFFER may be used, and the\n * response returned will be either the text response or the Mozilla\n * implementation of the array buffer response.\n *\n * On browsers will full support, any valid response type supported by the\n * browser may be used, and the response provided by the browser will be\n * returned.\n *\n * @return {*} The response.\n */\ngoog.net.XhrIo.prototype.getResponse = function() {\n  try {\n    if (!this.xhr_) {\n      return null;\n    }\n    if ('response' in this.xhr_) {\n      return this.xhr_.response;\n    }\n    switch (this.responseType_) {\n      case ResponseType.DEFAULT:\n      case ResponseType.TEXT:\n        return this.xhr_.responseText;\n      // DOCUMENT and BLOB don't need to be handled here because they are\n      // introduced in the same spec that adds the .response field, and would\n      // have been caught above.\n      // ARRAY_BUFFER needs an implementation for Firefox 4, where it was\n      // implemented using a draft spec rather than the final spec.\n      case ResponseType.ARRAY_BUFFER:\n        if ('mozResponseArrayBuffer' in this.xhr_) {\n          return this.xhr_.mozResponseArrayBuffer;\n        }\n    }\n    // Fell through to a response type that is not supported on this browser.\n    goog.log.error(\n        this.logger_, 'Response type ' + this.responseType_ + ' is not ' +\n            'supported on this browser');\n    return null;\n  } catch (e) {\n    goog.log.fine(this.logger_, 'Can not get response: ' + e.message);\n    return null;\n  }\n};\n\n\n/**\n * Get the value of the response-header with the given name from the Xhr object\n * Will only return correct result when called from the context of a callback\n * and the request has completed\n * @param {string} key The name of the response-header to retrieve.\n * @return {string|undefined} The value of the response-header named key.\n */\ngoog.net.XhrIo.prototype.getResponseHeader = function(key) {\n  if (!this.xhr_ || !this.isComplete()) {\n    return undefined;\n  }\n\n  var value = this.xhr_.getResponseHeader(key);\n  return value === null ? undefined : value;\n};\n\n\n/**\n * Gets the text of all the headers in the response.\n * Will only return correct result when called from the context of a callback\n * and the request has completed.\n * @return {string} The value of the response headers or empty string.\n */\ngoog.net.XhrIo.prototype.getAllResponseHeaders = function() {\n  // getAllResponseHeaders can return null if no response has been received,\n  // ensure we always return an empty string.\n  return this.xhr_ && this.isComplete() ?\n      (this.xhr_.getAllResponseHeaders() || '') :\n      '';\n};\n\n\n/**\n * Returns all response headers as a key-value map.\n * Multiple values for the same header key can be combined into one,\n * separated by a comma and a space.\n * Note that the native getResponseHeader method for retrieving a single header\n * does a case insensitive match on the header name. This method does not\n * include any case normalization logic, it will just return a key-value\n * representation of the headers.\n * See: http://www.w3.org/TR/XMLHttpRequest/#the-getresponseheader()-method\n * @return {!Object<string, string>} An object with the header keys as keys\n *     and header values as values.\n */\ngoog.net.XhrIo.prototype.getResponseHeaders = function() {\n  // TODO(user): Make this function parse headers as per the spec\n  // (https://tools.ietf.org/html/rfc2616#section-4.2).\n\n  var headersObject = {};\n  var headersArray = this.getAllResponseHeaders().split('\\r\\n');\n  for (var i = 0; i < headersArray.length; i++) {\n    if (goog.string.isEmptyOrWhitespace(headersArray[i])) {\n      continue;\n    }\n    var keyValue =\n        goog.string.splitLimit(headersArray[i], ':', /* maxSplitCount= */ 1);\n    var key = keyValue[0];\n    var value = keyValue[1];\n\n    if (typeof value !== 'string') {\n      // There must be a value but it can be the empty string.\n      continue;\n    }\n\n    // Whitespace at the start and end of the value is meaningless.\n    value = value.trim();\n    // The key should not contain whitespace but we currently ignore that.\n\n    var values = headersObject[key] || [];\n    headersObject[key] = values;\n    values.push(value);\n  }\n\n  return goog.object.map(headersObject, function(values) {\n    return values.join(', ');\n  });\n};\n\n\n/**\n * Get the value of the response-header with the given name from the Xhr object.\n * As opposed to {@link #getResponseHeader}, this method does not require that\n * the request has completed.\n * @param {string} key The name of the response-header to retrieve.\n * @return {?string} The value of the response-header, or null if it is\n *     unavailable.\n */\ngoog.net.XhrIo.prototype.getStreamingResponseHeader = function(key) {\n  return this.xhr_ ? this.xhr_.getResponseHeader(key) : null;\n};\n\n\n/**\n * Gets the text of all the headers in the response. As opposed to\n * {@link #getAllResponseHeaders}, this method does not require that the request\n * has completed.\n * @return {string} The value of the response headers or empty string.\n */\ngoog.net.XhrIo.prototype.getAllStreamingResponseHeaders = function() {\n  return this.xhr_ ? this.xhr_.getAllResponseHeaders() : '';\n};\n\n\n/**\n * Get the last error message\n * @return {!goog.net.ErrorCode} Last error code.\n */\ngoog.net.XhrIo.prototype.getLastErrorCode = function() {\n  return this.lastErrorCode_;\n};\n\n\n/**\n * Get the last error message\n * @return {string} Last error message.\n */\ngoog.net.XhrIo.prototype.getLastError = function() {\n  return typeof this.lastError_ === 'string' ? this.lastError_ :\n                                               String(this.lastError_);\n};\n\n\n/**\n * Adds the last method, status and URI to the message.  This is used to add\n * this information to the logging calls.\n * @param {string} msg The message text that we want to add the extra text to.\n * @return {string} The message with the extra text appended.\n * @private\n */\ngoog.net.XhrIo.prototype.formatMsg_ = function(msg) {\n  return msg + ' [' + this.lastMethod_ + ' ' + this.lastUri_ + ' ' +\n      this.getStatus() + ']';\n};\n\n\n// Register the xhr handler as an entry point, so that\n// it can be monitored for exception handling, etc.\ngoog.debug.entryPointRegistry.register(\n    /**\n     * @param {function(!Function): !Function} transformer The transforming\n     *     function.\n     */\n    function(transformer) {\n      goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ =\n          transformer(goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_);\n    });\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview A pool of forward channel requests to enable real-time\n * messaging from the client to server.\n *\n */\n\ngoog.module('goog.labs.net.webChannel.ForwardChannelRequestPool');\n\ngoog.module.declareLegacyNamespace();\n\nvar ChannelRequest = goog.require('goog.labs.net.webChannel.ChannelRequest');\nvar Wire = goog.require('goog.labs.net.webChannel.Wire');\nvar array = goog.require('goog.array');\nvar googString = goog.require('goog.string');\n\n\n/**\n * This class represents the state of all forward channel requests.\n *\n * @param {number=} opt_maxPoolSize The maximum pool size.\n *\n * @struct @constructor @final\n */\nvar ForwardChannelRequestPool = function(opt_maxPoolSize) {\n  /**\n   * The max pool size as configured.\n   *\n   * @private {number}\n   */\n  this.maxPoolSizeConfigured_ =\n      opt_maxPoolSize || ForwardChannelRequestPool.MAX_POOL_SIZE_;\n\n  /**\n   * The current size limit of the request pool. This limit is meant to be\n   * read-only after the channel is fully opened.\n   *\n   * If SPDY or HTTP2 is enabled, set it to the max pool size, which is also\n   * configurable.\n   *\n   * @private {number}\n   */\n  this.maxSize_ = ForwardChannelRequestPool.isSpdyOrHttp2Enabled_() ?\n      this.maxPoolSizeConfigured_ :\n      1;\n\n  /**\n   * The container for all the pending request objects.\n   *\n   * @private {?Set<?ChannelRequest>}\n   */\n  this.requestPool_ = null;\n\n  if (this.maxSize_ > 1) {\n    this.requestPool_ = new Set();\n  }\n\n  /**\n   * The single request object when the pool size is limited to one.\n   *\n   * @private {?ChannelRequest}\n   */\n  this.request_ = null;\n\n  /**\n   * Saved pending messages when the pool is cancelled.\n   *\n   * @private {!Array<Wire.QueuedMap>}\n   */\n  this.pendingMessages_ = [];\n};\n\n\n/**\n * The default size limit of the request pool.\n *\n * @private {number}\n */\nForwardChannelRequestPool.MAX_POOL_SIZE_ = 10;\n\n\n/**\n * @return {boolean} True if SPDY or HTTP2 is enabled. Uses chrome-specific APIs\n *     as a fallback and will always return false for other browsers where\n *     PerformanceNavigationTiming is not available.\n * @private\n */\nForwardChannelRequestPool.isSpdyOrHttp2Enabled_ = function() {\n  if (goog.global.PerformanceNavigationTiming) {\n    var entrys = /** @type {!Array<!PerformanceNavigationTiming>} */ (\n        goog.global.performance.getEntriesByType('navigation'));\n    return entrys.length > 0 &&\n        (entrys[0].nextHopProtocol == 'hq' ||\n         entrys[0].nextHopProtocol == 'h2');\n  }\n  return !!(\n      goog.global.chrome && goog.global.chrome.loadTimes &&\n      goog.global.chrome.loadTimes() &&\n      goog.global.chrome.loadTimes().wasFetchedViaSpdy);\n};\n\n\n/**\n * Once we know the client protocol (from the handshake), check if we need\n * enable the request pool accordingly. This is more robust than using\n * browser-internal APIs (specific to Chrome).\n *\n * @param {string} clientProtocol The client protocol\n */\nForwardChannelRequestPool.prototype.applyClientProtocol = function(\n    clientProtocol) {\n  if (this.requestPool_) {\n    return;\n  }\n\n  if (googString.contains(clientProtocol, 'spdy') ||\n      googString.contains(clientProtocol, 'quic') ||\n      googString.contains(clientProtocol, 'h2')) {\n    this.maxSize_ = this.maxPoolSizeConfigured_;\n    this.requestPool_ = new Set();\n    if (this.request_) {\n      this.addRequest(this.request_);\n      this.request_ = null;\n    }\n  }\n};\n\n\n/**\n * @return {boolean} True if the pool is full.\n */\nForwardChannelRequestPool.prototype.isFull = function() {\n  if (this.request_) {\n    return true;\n  }\n\n  if (this.requestPool_) {\n    return this.requestPool_.size >= this.maxSize_;\n  }\n\n  return false;\n};\n\n\n/**\n * @return {number} The current size limit.\n */\nForwardChannelRequestPool.prototype.getMaxSize = function() {\n  return this.maxSize_;\n};\n\n\n/**\n * @return {number} The number of pending requests in the pool.\n */\nForwardChannelRequestPool.prototype.getRequestCount = function() {\n  if (this.request_) {\n    return 1;\n  }\n\n  if (this.requestPool_) {\n    return this.requestPool_.size;\n  }\n\n  return 0;\n};\n\n\n/**\n * @param {ChannelRequest} req The channel request.\n * @return {boolean} True if the request is a included inside the pool.\n */\nForwardChannelRequestPool.prototype.hasRequest = function(req) {\n  if (this.request_) {\n    return this.request_ == req;\n  }\n\n  if (this.requestPool_) {\n    return this.requestPool_.has(req);\n  }\n\n  return false;\n};\n\n\n/**\n * Adds a new request to the pool.\n *\n * @param {!ChannelRequest} req The new channel request.\n */\nForwardChannelRequestPool.prototype.addRequest = function(req) {\n  if (this.requestPool_) {\n    this.requestPool_.add(req);\n  } else {\n    this.request_ = req;\n  }\n};\n\n\n/**\n * Removes the given request from the pool.\n *\n * @param {ChannelRequest} req The channel request.\n * @return {boolean} Whether the request has been removed from the pool.\n */\nForwardChannelRequestPool.prototype.removeRequest = function(req) {\n  if (this.request_ && this.request_ == req) {\n    this.request_ = null;\n    return true;\n  }\n\n  if (this.requestPool_ && this.requestPool_.has(req)) {\n    this.requestPool_.delete(req);\n    return true;\n  }\n\n  return false;\n};\n\n\n/**\n * Clears the pool and cancel all the pending requests.\n */\nForwardChannelRequestPool.prototype.cancel = function() {\n  // save any pending messages\n  this.pendingMessages_ = this.getPendingMessages();\n\n  if (this.request_) {\n    this.request_.cancel();\n    this.request_ = null;\n    return;\n  }\n\n  if (this.requestPool_ && this.requestPool_.size !== 0) {\n    for (const val of this.requestPool_.values()) {\n      val.cancel();\n    }\n    this.requestPool_.clear();\n  }\n};\n\n\n/**\n * @return {boolean} Whether there are any pending requests.\n */\nForwardChannelRequestPool.prototype.hasPendingRequest = function() {\n  return (this.request_ != null) ||\n      (this.requestPool_ != null && this.requestPool_.size !== 0);\n};\n\n\n/**\n * @return {!Array<Wire.QueuedMap>} All the pending messages from the pool,\n *     as a new array.\n */\nForwardChannelRequestPool.prototype.getPendingMessages = function() {\n  if (this.request_ != null) {\n    return this.pendingMessages_.concat(this.request_.getPendingMessages());\n  }\n\n  if (this.requestPool_ != null && this.requestPool_.size !== 0) {\n    let result = this.pendingMessages_;\n    for (const val of this.requestPool_.values()) {\n      result = result.concat(val.getPendingMessages());\n    }\n    return result;\n  }\n\n  return array.clone(this.pendingMessages_);\n};\n\n\n/**\n * Records pending messages, e.g. when a request receives a failed response.\n *\n * @param {!Array<Wire.QueuedMap>} messages Pending messages.\n */\nForwardChannelRequestPool.prototype.addPendingMessages = function(messages) {\n  this.pendingMessages_ = this.pendingMessages_.concat(messages);\n};\n\n\n/**\n * Clears any recorded pending messages.\n */\nForwardChannelRequestPool.prototype.clearPendingMessages = function() {\n  this.pendingMessages_.length = 0;\n};\n\n\n/**\n * Cancels all pending requests and force the completion of channel requests.\n *\n * Need go through the standard onRequestComplete logic to expose the max-retry\n * failure in the standard way.\n *\n * @param {function(!ChannelRequest)} onComplete The completion callback.\n * @return {boolean} true if any request has been forced to complete.\n */\nForwardChannelRequestPool.prototype.forceComplete = function(onComplete) {\n  if (this.request_ != null) {\n    this.request_.cancel();\n    onComplete(this.request_);\n    return true;\n  }\n\n  if (this.requestPool_ && this.requestPool_.size !== 0) {\n    for (const val of this.requestPool_.values()) {\n      val.cancel();\n      onComplete(val);\n    }\n    return true;\n  }\n\n  return false;\n};\n\nexports = ForwardChannelRequestPool;\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Generics method for collection-like classes and objects.\n *\n *\n * This file contains functions to work with collections. It supports using\n * Map, Set, Array and Object and other classes that implement collection-like\n * methods.\n * @suppress {strictMissingProperties}\n */\n\n\ngoog.provide('goog.structs');\n\ngoog.require('goog.array');\ngoog.require('goog.object');\n\n\n// We treat an object as a dictionary if it has getKeys or it is an object that\n// isn't arrayLike.\n\n\n/**\n * Returns the number of values in the collection-like object.\n * @param {Object} col The collection-like object.\n * @return {number} The number of values in the collection-like object.\n */\ngoog.structs.getCount = function(col) {\n  if (col.getCount && typeof col.getCount == 'function') {\n    return col.getCount();\n  }\n  if (goog.isArrayLike(col) || typeof col === 'string') {\n    return col.length;\n  }\n  return goog.object.getCount(col);\n};\n\n\n/**\n * Returns the values of the collection-like object.\n * @param {Object} col The collection-like object.\n * @return {!Array<?>} The values in the collection-like object.\n */\ngoog.structs.getValues = function(col) {\n  if (col.getValues && typeof col.getValues == 'function') {\n    return col.getValues();\n  }\n  if (typeof col === 'string') {\n    return col.split('');\n  }\n  if (goog.isArrayLike(col)) {\n    var rv = [];\n    var l = col.length;\n    for (var i = 0; i < l; i++) {\n      rv.push(col[i]);\n    }\n    return rv;\n  }\n  return goog.object.getValues(col);\n};\n\n\n/**\n * Returns the keys of the collection. Some collections have no notion of\n * keys/indexes and this function will return undefined in those cases.\n * @param {Object} col The collection-like object.\n * @return {!Array|undefined} The keys in the collection.\n */\ngoog.structs.getKeys = function(col) {\n  if (col.getKeys && typeof col.getKeys == 'function') {\n    return col.getKeys();\n  }\n  // if we have getValues but no getKeys we know this is a key-less collection\n  if (col.getValues && typeof col.getValues == 'function') {\n    return undefined;\n  }\n  if (goog.isArrayLike(col) || typeof col === 'string') {\n    var rv = [];\n    var l = col.length;\n    for (var i = 0; i < l; i++) {\n      rv.push(i);\n    }\n    return rv;\n  }\n\n  return goog.object.getKeys(col);\n};\n\n\n/**\n * Whether the collection contains the given value. This is O(n) and uses\n * equals (==) to test the existence.\n * @param {Object} col The collection-like object.\n * @param {*} val The value to check for.\n * @return {boolean} True if the map contains the value.\n */\ngoog.structs.contains = function(col, val) {\n  if (col.contains && typeof col.contains == 'function') {\n    return col.contains(val);\n  }\n  if (col.containsValue && typeof col.containsValue == 'function') {\n    return col.containsValue(val);\n  }\n  if (goog.isArrayLike(col) || typeof col === 'string') {\n    return goog.array.contains(/** @type {!Array<?>} */ (col), val);\n  }\n  return goog.object.containsValue(col, val);\n};\n\n\n/**\n * Whether the collection is empty.\n * @param {Object} col The collection-like object.\n * @return {boolean} True if empty.\n */\ngoog.structs.isEmpty = function(col) {\n  if (col.isEmpty && typeof col.isEmpty == 'function') {\n    return col.isEmpty();\n  }\n\n  // We do not use goog.string.isEmptyOrWhitespace because here we treat the\n  // string as\n  // collection and as such even whitespace matters\n\n  if (goog.isArrayLike(col) || typeof col === 'string') {\n    return goog.array.isEmpty(/** @type {!Array<?>} */ (col));\n  }\n  return goog.object.isEmpty(col);\n};\n\n\n/**\n * Removes all the elements from the collection.\n * @param {Object} col The collection-like object.\n */\ngoog.structs.clear = function(col) {\n  // NOTE(arv): This should not contain strings because strings are immutable\n  if (col.clear && typeof col.clear == 'function') {\n    col.clear();\n  } else if (goog.isArrayLike(col)) {\n    goog.array.clear(/** @type {IArrayLike<?>} */ (col));\n  } else {\n    goog.object.clear(col);\n  }\n};\n\n\n/**\n * Calls a function for each value in a collection. The function takes\n * three arguments; the value, the key and the collection.\n *\n * @param {S} col The collection-like object.\n * @param {function(this:T,?,?,S):?} f The function to call for every value.\n *     This function takes\n *     3 arguments (the value, the key or undefined if the collection has no\n *     notion of keys, and the collection) and the return value is irrelevant.\n * @param {T=} opt_obj The object to be used as the value of 'this'\n *     within `f`.\n * @template T,S\n * @deprecated Use a more specific method, e.g. goog.array.forEach,\n *     goog.object.forEach, or for-of.\n */\ngoog.structs.forEach = function(col, f, opt_obj) {\n  if (col.forEach && typeof col.forEach == 'function') {\n    col.forEach(f, opt_obj);\n  } else if (goog.isArrayLike(col) || typeof col === 'string') {\n    goog.array.forEach(/** @type {!Array<?>} */ (col), f, opt_obj);\n  } else {\n    var keys = goog.structs.getKeys(col);\n    var values = goog.structs.getValues(col);\n    var l = values.length;\n    for (var i = 0; i < l; i++) {\n      f.call(/** @type {?} */ (opt_obj), values[i], keys && keys[i], col);\n    }\n  }\n};\n\n\n/**\n * Calls a function for every value in the collection. When a call returns true,\n * adds the value to a new collection (Array is returned by default).\n *\n * @param {S} col The collection-like object.\n * @param {function(this:T,?,?,S):boolean} f The function to call for every\n *     value. This function takes\n *     3 arguments (the value, the key or undefined if the collection has no\n *     notion of keys, and the collection) and should return a Boolean. If the\n *     return value is true the value is added to the result collection. If it\n *     is false the value is not included.\n * @param {T=} opt_obj The object to be used as the value of 'this'\n *     within `f`.\n * @return {!Object|!Array<?>} A new collection where the passed values are\n *     present. If col is a key-less collection an array is returned.  If col\n *     has keys and values a plain old JS object is returned.\n * @template T,S\n */\ngoog.structs.filter = function(col, f, opt_obj) {\n  if (typeof col.filter == 'function') {\n    return col.filter(f, opt_obj);\n  }\n  if (goog.isArrayLike(col) || typeof col === 'string') {\n    return goog.array.filter(/** @type {!Array<?>} */ (col), f, opt_obj);\n  }\n\n  var rv;\n  var keys = goog.structs.getKeys(col);\n  var values = goog.structs.getValues(col);\n  var l = values.length;\n  if (keys) {\n    rv = {};\n    for (var i = 0; i < l; i++) {\n      if (f.call(/** @type {?} */ (opt_obj), values[i], keys[i], col)) {\n        rv[keys[i]] = values[i];\n      }\n    }\n  } else {\n    // We should not use goog.array.filter here since we want to make sure that\n    // the index is undefined as well as make sure that col is passed to the\n    // function.\n    rv = [];\n    for (var i = 0; i < l; i++) {\n      if (f.call(opt_obj, values[i], undefined, col)) {\n        rv.push(values[i]);\n      }\n    }\n  }\n  return rv;\n};\n\n\n/**\n * Calls a function for every value in the collection and adds the result into a\n * new collection (defaults to creating a new Array).\n *\n * @param {S} col The collection-like object.\n * @param {function(this:T,?,?,S):V} f The function to call for every value.\n *     This function takes 3 arguments (the value, the key or undefined if the\n *     collection has no notion of keys, and the collection) and should return\n *     something. The result will be used as the value in the new collection.\n * @param {T=} opt_obj  The object to be used as the value of 'this'\n *     within `f`.\n * @return {!Object<V>|!Array<V>} A new collection with the new values.  If\n *     col is a key-less collection an array is returned.  If col has keys and\n *     values a plain old JS object is returned.\n * @template T,S,V\n */\ngoog.structs.map = function(col, f, opt_obj) {\n  if (typeof col.map == 'function') {\n    return col.map(f, opt_obj);\n  }\n  if (goog.isArrayLike(col) || typeof col === 'string') {\n    return goog.array.map(/** @type {!Array<?>} */ (col), f, opt_obj);\n  }\n\n  var rv;\n  var keys = goog.structs.getKeys(col);\n  var values = goog.structs.getValues(col);\n  var l = values.length;\n  if (keys) {\n    rv = {};\n    for (var i = 0; i < l; i++) {\n      rv[keys[i]] = f.call(/** @type {?} */ (opt_obj), values[i], keys[i], col);\n    }\n  } else {\n    // We should not use goog.array.map here since we want to make sure that\n    // the index is undefined as well as make sure that col is passed to the\n    // function.\n    rv = [];\n    for (var i = 0; i < l; i++) {\n      rv[i] = f.call(/** @type {?} */ (opt_obj), values[i], undefined, col);\n    }\n  }\n  return rv;\n};\n\n\n/**\n * Calls f for each value in a collection. If any call returns true this returns\n * true (without checking the rest). If all returns false this returns false.\n *\n * @param {S} col The collection-like object.\n * @param {function(this:T,?,?,S):boolean} f The function to call for every\n *     value. This function takes 3 arguments (the value, the key or undefined\n *     if the collection has no notion of keys, and the collection) and should\n *     return a boolean.\n * @param {T=} opt_obj  The object to be used as the value of 'this'\n *     within `f`.\n * @return {boolean} True if any value passes the test.\n * @template T,S\n */\ngoog.structs.some = function(col, f, opt_obj) {\n  if (typeof col.some == 'function') {\n    return col.some(f, opt_obj);\n  }\n  if (goog.isArrayLike(col) || typeof col === 'string') {\n    return goog.array.some(/** @type {!Array<?>} */ (col), f, opt_obj);\n  }\n  var keys = goog.structs.getKeys(col);\n  var values = goog.structs.getValues(col);\n  var l = values.length;\n  for (var i = 0; i < l; i++) {\n    if (f.call(/** @type {?} */ (opt_obj), values[i], keys && keys[i], col)) {\n      return true;\n    }\n  }\n  return false;\n};\n\n\n/**\n * Calls f for each value in a collection. If all calls return true this return\n * true this returns true. If any returns false this returns false at this point\n *  and does not continue to check the remaining values.\n *\n * @param {S} col The collection-like object.\n * @param {function(this:T,?,?,S):boolean} f The function to call for every\n *     value. This function takes 3 arguments (the value, the key or\n *     undefined if the collection has no notion of keys, and the collection)\n *     and should return a boolean.\n * @param {T=} opt_obj  The object to be used as the value of 'this'\n *     within `f`.\n * @return {boolean} True if all key-value pairs pass the test.\n * @template T,S\n */\ngoog.structs.every = function(col, f, opt_obj) {\n  if (typeof col.every == 'function') {\n    return col.every(f, opt_obj);\n  }\n  if (goog.isArrayLike(col) || typeof col === 'string') {\n    return goog.array.every(/** @type {!Array<?>} */ (col), f, opt_obj);\n  }\n  var keys = goog.structs.getKeys(col);\n  var values = goog.structs.getValues(col);\n  var l = values.length;\n  for (var i = 0; i < l; i++) {\n    if (!f.call(/** @type {?} */ (opt_obj), values[i], keys && keys[i], col)) {\n      return false;\n    }\n  }\n  return true;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Datastructure: Hash Map.\n *\n *\n * This file contains an implementation of a Map structure. It implements a lot\n * of the methods used in goog.structs so those functions work on hashes. This\n * is best suited for complex key types. For simple keys such as numbers and\n * strings consider using the lighter-weight utilities in goog.object.\n */\n\n\ngoog.provide('goog.structs.Map');\n\ngoog.require('goog.iter.Iterator');\ngoog.require('goog.iter.StopIteration');\n\n\n\n/**\n * Class for Hash Map datastructure.\n * @param {*=} opt_map Map or Object to initialize the map with.\n * @param {...*} var_args If 2 or more arguments are present then they\n *     will be used as key-value pairs.\n * @constructor\n * @template K, V\n * @deprecated This type is misleading: use ES6 Map instead.\n */\ngoog.structs.Map = function(opt_map, var_args) {\n\n  /**\n   * Underlying JS object used to implement the map.\n   * @private {!Object}\n   */\n  this.map_ = {};\n\n  /**\n   * An array of keys. This is necessary for two reasons:\n   *   1. Iterating the keys using for (var key in this.map_) allocates an\n   *      object for every key in IE which is really bad for IE6 GC perf.\n   *   2. Without a side data structure, we would need to escape all the keys\n   *      as that would be the only way we could tell during iteration if the\n   *      key was an internal key or a property of the object.\n   *\n   * This array can contain deleted keys so it's necessary to check the map\n   * as well to see if the key is still in the map (this doesn't require a\n   * memory allocation in IE).\n   * @private {!Array<string>}\n   */\n  this.keys_ = [];\n\n  /**\n   * The number of key value pairs in the map.\n   * @private {number}\n   */\n  this.count_ = 0;\n\n  /**\n   * Version used to detect changes while iterating.\n   * @private {number}\n   */\n  this.version_ = 0;\n\n  var argLength = arguments.length;\n\n  if (argLength > 1) {\n    if (argLength % 2) {\n      throw new Error('Uneven number of arguments');\n    }\n    for (var i = 0; i < argLength; i += 2) {\n      this.set(arguments[i], arguments[i + 1]);\n    }\n  } else if (opt_map) {\n    this.addAll(/** @type {!Object} */ (opt_map));\n  }\n};\n\n\n/**\n * @return {number} The number of key-value pairs in the map.\n */\ngoog.structs.Map.prototype.getCount = function() {\n  return this.count_;\n};\n\n\n/**\n * Returns the values of the map.\n * @return {!Array<V>} The values in the map.\n */\ngoog.structs.Map.prototype.getValues = function() {\n  this.cleanupKeysArray_();\n\n  var rv = [];\n  for (var i = 0; i < this.keys_.length; i++) {\n    var key = this.keys_[i];\n    rv.push(this.map_[key]);\n  }\n  return rv;\n};\n\n\n/**\n * Returns the keys of the map.\n * @return {!Array<string>} Array of string values.\n */\ngoog.structs.Map.prototype.getKeys = function() {\n  this.cleanupKeysArray_();\n  return /** @type {!Array<string>} */ (this.keys_.concat());\n};\n\n\n/**\n * Whether the map contains the given key.\n * @param {*} key The key to check for.\n * @return {boolean} Whether the map contains the key.\n */\ngoog.structs.Map.prototype.containsKey = function(key) {\n  return goog.structs.Map.hasKey_(this.map_, key);\n};\n\n\n/**\n * Whether the map contains the given value. This is O(n).\n * @param {V} val The value to check for.\n * @return {boolean} Whether the map contains the value.\n */\ngoog.structs.Map.prototype.containsValue = function(val) {\n  for (var i = 0; i < this.keys_.length; i++) {\n    var key = this.keys_[i];\n    if (goog.structs.Map.hasKey_(this.map_, key) && this.map_[key] == val) {\n      return true;\n    }\n  }\n  return false;\n};\n\n\n/**\n * Whether this map is equal to the argument map.\n * @param {goog.structs.Map} otherMap The map against which to test equality.\n * @param {function(V, V): boolean=} opt_equalityFn Optional equality function\n *     to test equality of values. If not specified, this will test whether\n *     the values contained in each map are identical objects.\n * @return {boolean} Whether the maps are equal.\n */\ngoog.structs.Map.prototype.equals = function(otherMap, opt_equalityFn) {\n  if (this === otherMap) {\n    return true;\n  }\n\n  if (this.count_ != otherMap.getCount()) {\n    return false;\n  }\n\n  var equalityFn = opt_equalityFn || goog.structs.Map.defaultEquals;\n\n  this.cleanupKeysArray_();\n  for (var key, i = 0; key = this.keys_[i]; i++) {\n    if (!equalityFn(this.get(key), otherMap.get(key))) {\n      return false;\n    }\n  }\n\n  return true;\n};\n\n\n/**\n * Default equality test for values.\n * @param {*} a The first value.\n * @param {*} b The second value.\n * @return {boolean} Whether a and b reference the same object.\n */\ngoog.structs.Map.defaultEquals = function(a, b) {\n  return a === b;\n};\n\n\n/**\n * @return {boolean} Whether the map is empty.\n */\ngoog.structs.Map.prototype.isEmpty = function() {\n  return this.count_ == 0;\n};\n\n\n/**\n * Removes all key-value pairs from the map.\n */\ngoog.structs.Map.prototype.clear = function() {\n  this.map_ = {};\n  this.keys_.length = 0;\n  this.count_ = 0;\n  this.version_ = 0;\n};\n\n\n/**\n * Removes a key-value pair based on the key. This is O(logN) amortized due to\n * updating the keys array whenever the count becomes half the size of the keys\n * in the keys array.\n * @param {*} key  The key to remove.\n * @return {boolean} Whether object was removed.\n */\ngoog.structs.Map.prototype.remove = function(key) {\n  if (goog.structs.Map.hasKey_(this.map_, key)) {\n    delete this.map_[key];\n    this.count_--;\n    this.version_++;\n\n    // clean up the keys array if the threshold is hit\n    if (this.keys_.length > 2 * this.count_) {\n      this.cleanupKeysArray_();\n    }\n\n    return true;\n  }\n  return false;\n};\n\n\n/**\n * Cleans up the temp keys array by removing entries that are no longer in the\n * map.\n * @private\n */\ngoog.structs.Map.prototype.cleanupKeysArray_ = function() {\n  if (this.count_ != this.keys_.length) {\n    // First remove keys that are no longer in the map.\n    var srcIndex = 0;\n    var destIndex = 0;\n    while (srcIndex < this.keys_.length) {\n      var key = this.keys_[srcIndex];\n      if (goog.structs.Map.hasKey_(this.map_, key)) {\n        this.keys_[destIndex++] = key;\n      }\n      srcIndex++;\n    }\n    this.keys_.length = destIndex;\n  }\n\n  if (this.count_ != this.keys_.length) {\n    // If the count still isn't correct, that means we have duplicates. This can\n    // happen when the same key is added and removed multiple times. Now we have\n    // to allocate one extra Object to remove the duplicates. This could have\n    // been done in the first pass, but in the common case, we can avoid\n    // allocating an extra object by only doing this when necessary.\n    var seen = {};\n    var srcIndex = 0;\n    var destIndex = 0;\n    while (srcIndex < this.keys_.length) {\n      var key = this.keys_[srcIndex];\n      if (!(goog.structs.Map.hasKey_(seen, key))) {\n        this.keys_[destIndex++] = key;\n        seen[key] = 1;\n      }\n      srcIndex++;\n    }\n    this.keys_.length = destIndex;\n  }\n};\n\n\n/**\n * Returns the value for the given key.  If the key is not found and the default\n * value is not given this will return `undefined`.\n * @param {*} key The key to get the value for.\n * @param {DEFAULT=} opt_val The value to return if no item is found for the\n *     given key, defaults to undefined.\n * @return {V|DEFAULT} The value for the given key.\n * @template DEFAULT\n */\ngoog.structs.Map.prototype.get = function(key, opt_val) {\n  if (goog.structs.Map.hasKey_(this.map_, key)) {\n    return this.map_[key];\n  }\n  return opt_val;\n};\n\n\n/**\n * Adds a key-value pair to the map.\n * @param {*} key The key.\n * @param {V} value The value to add.\n * @return {*} Some subclasses return a value.\n */\ngoog.structs.Map.prototype.set = function(key, value) {\n  if (!(goog.structs.Map.hasKey_(this.map_, key))) {\n    this.count_++;\n    // TODO(johnlenz): This class lies, it claims to return an array of string\n    // keys, but instead returns the original object used.\n    this.keys_.push(/** @type {?} */ (key));\n    // Only change the version if we add a new key.\n    this.version_++;\n  }\n  this.map_[key] = value;\n};\n\n\n/**\n * Adds multiple key-value pairs from another goog.structs.Map or Object.\n * @param {?Object} map Object containing the data to add.\n */\ngoog.structs.Map.prototype.addAll = function(map) {\n  if (map instanceof goog.structs.Map) {\n    var keys = map.getKeys();\n    for (var i = 0; i < keys.length; i++) {\n      this.set(keys[i], map.get(keys[i]));\n    }\n  } else {\n    for (var key in map) {\n      this.set(key, map[key]);\n    }\n  }\n};\n\n\n/**\n * Calls the given function on each entry in the map.\n * @param {function(this:T, V, K, goog.structs.Map<K,V>)} f\n * @param {T=} opt_obj The value of \"this\" inside f.\n * @template T\n */\ngoog.structs.Map.prototype.forEach = function(f, opt_obj) {\n  var keys = this.getKeys();\n  for (var i = 0; i < keys.length; i++) {\n    var key = keys[i];\n    var value = this.get(key);\n    f.call(opt_obj, value, key, this);\n  }\n};\n\n\n/**\n * Clones a map and returns a new map.\n * @return {!goog.structs.Map} A new map with the same key-value pairs.\n */\ngoog.structs.Map.prototype.clone = function() {\n  return new goog.structs.Map(this);\n};\n\n\n/**\n * Returns a new map in which all the keys and values are interchanged\n * (keys become values and values become keys). If multiple keys map to the\n * same value, the chosen transposed value is implementation-dependent.\n *\n * It acts very similarly to {goog.object.transpose(Object)}.\n *\n * @return {!goog.structs.Map} The transposed map.\n */\ngoog.structs.Map.prototype.transpose = function() {\n  var transposed = new goog.structs.Map();\n  for (var i = 0; i < this.keys_.length; i++) {\n    var key = this.keys_[i];\n    var value = this.map_[key];\n    transposed.set(value, key);\n  }\n\n  return transposed;\n};\n\n\n/**\n * @return {!Object} Object representation of the map.\n */\ngoog.structs.Map.prototype.toObject = function() {\n  this.cleanupKeysArray_();\n  var obj = {};\n  for (var i = 0; i < this.keys_.length; i++) {\n    var key = this.keys_[i];\n    obj[key] = this.map_[key];\n  }\n  return obj;\n};\n\n\n/**\n * Returns an iterator that iterates over the keys in the map.  Removal of keys\n * while iterating might have undesired side effects.\n * @return {!goog.iter.Iterator} An iterator over the keys in the map.\n */\ngoog.structs.Map.prototype.getKeyIterator = function() {\n  return this.__iterator__(true);\n};\n\n\n/**\n * Returns an iterator that iterates over the values in the map.  Removal of\n * keys while iterating might have undesired side effects.\n * @return {!goog.iter.Iterator} An iterator over the values in the map.\n */\ngoog.structs.Map.prototype.getValueIterator = function() {\n  return this.__iterator__(false);\n};\n\n\n/**\n * Returns an iterator that iterates over the values or the keys in the map.\n * This throws an exception if the map was mutated since the iterator was\n * created.\n * @param {boolean=} opt_keys True to iterate over the keys. False to iterate\n *     over the values.  The default value is false.\n * @return {!goog.iter.Iterator} An iterator over the values or keys in the map.\n */\ngoog.structs.Map.prototype.__iterator__ = function(opt_keys) {\n  // Clean up keys to minimize the risk of iterating over dead keys.\n  this.cleanupKeysArray_();\n\n  var i = 0;\n  var version = this.version_;\n  var selfObj = this;\n\n  var newIter = new goog.iter.Iterator;\n  newIter.next = function() {\n    if (version != selfObj.version_) {\n      throw new Error('The map has changed since the iterator was created');\n    }\n    if (i >= selfObj.keys_.length) {\n      throw goog.iter.StopIteration;\n    }\n    var key = selfObj.keys_[i++];\n    return opt_keys ? key : selfObj.map_[key];\n  };\n  return newIter;\n};\n\n\n/**\n * Safe way to test for hasOwnProperty.  It even allows testing for\n * 'hasOwnProperty'.\n * @param {!Object} obj The object to test for presence of the given key.\n * @param {*} key The key to check for.\n * @return {boolean} Whether the object has the key.\n * @private\n */\ngoog.structs.Map.hasKey_ = function(obj, key) {\n  return Object.prototype.hasOwnProperty.call(obj, key);\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Simple utilities for dealing with URI strings.\n *\n * This is intended to be a lightweight alternative to constructing goog.Uri\n * objects.  Whereas goog.Uri adds several kilobytes to the binary regardless\n * of how much of its functionality you use, this is designed to be a set of\n * mostly-independent utilities so that the compiler includes only what is\n * necessary for the task.  Estimated savings of porting is 5k pre-gzip and\n * 1.5k post-gzip.  To ensure the savings remain, future developers should\n * avoid adding new functionality to existing functions, but instead create\n * new ones and factor out shared code.\n *\n * Many of these utilities have limited functionality, tailored to common\n * cases.  The query parameter utilities assume that the parameter keys are\n * already encoded, since most keys are compile-time alphanumeric strings.  The\n * query parameter mutation utilities also do not tolerate fragment identifiers.\n *\n * By design, these functions can be slower than goog.Uri equivalents.\n * Repeated calls to some of functions may be quadratic in behavior for IE,\n * although the effect is somewhat limited given the 2kb limit.\n *\n * One advantage of the limited functionality here is that this approach is\n * less sensitive to differences in URI encodings than goog.Uri, since these\n * functions operate on strings directly, rather than decoding them and\n * then re-encoding.\n *\n * Uses features of RFC 3986 for parsing/formatting URIs:\n *   http://www.ietf.org/rfc/rfc3986.txt\n */\n\ngoog.provide('goog.uri.utils');\ngoog.provide('goog.uri.utils.ComponentIndex');\ngoog.provide('goog.uri.utils.QueryArray');\ngoog.provide('goog.uri.utils.QueryValue');\ngoog.provide('goog.uri.utils.StandardQueryParam');\n\ngoog.require('goog.array');\ngoog.require('goog.asserts');\ngoog.require('goog.string');\n\n\n/**\n * Character codes inlined to avoid object allocations due to charCode.\n * @enum {number}\n * @private\n */\ngoog.uri.utils.CharCode_ = {\n  AMPERSAND: 38,\n  EQUAL: 61,\n  HASH: 35,\n  QUESTION: 63\n};\n\n\n/**\n * Builds a URI string from already-encoded parts.\n *\n * No encoding is performed.  Any component may be omitted as either null or\n * undefined.\n *\n * @param {?string=} opt_scheme The scheme such as 'http'.\n * @param {?string=} opt_userInfo The user name before the '@'.\n * @param {?string=} opt_domain The domain such as 'www.google.com', already\n *     URI-encoded.\n * @param {(string|number|null)=} opt_port The port number.\n * @param {?string=} opt_path The path, already URI-encoded.  If it is not\n *     empty, it must begin with a slash.\n * @param {?string=} opt_queryData The URI-encoded query data.\n * @param {?string=} opt_fragment The URI-encoded fragment identifier.\n * @return {string} The fully combined URI.\n */\ngoog.uri.utils.buildFromEncodedParts = function(\n    opt_scheme, opt_userInfo, opt_domain, opt_port, opt_path, opt_queryData,\n    opt_fragment) {\n  var out = '';\n\n  if (opt_scheme) {\n    out += opt_scheme + ':';\n  }\n\n  if (opt_domain) {\n    out += '//';\n\n    if (opt_userInfo) {\n      out += opt_userInfo + '@';\n    }\n\n    out += opt_domain;\n\n    if (opt_port) {\n      out += ':' + opt_port;\n    }\n  }\n\n  if (opt_path) {\n    out += opt_path;\n  }\n\n  if (opt_queryData) {\n    out += '?' + opt_queryData;\n  }\n\n  if (opt_fragment) {\n    out += '#' + opt_fragment;\n  }\n\n  return out;\n};\n\n\n/**\n * A regular expression for breaking a URI into its component parts.\n *\n * {@link http://www.ietf.org/rfc/rfc3986.txt} says in Appendix B\n * As the \"first-match-wins\" algorithm is identical to the \"greedy\"\n * disambiguation method used by POSIX regular expressions, it is natural and\n * commonplace to use a regular expression for parsing the potential five\n * components of a URI reference.\n *\n * The following line is the regular expression for breaking-down a\n * well-formed URI reference into its components.\n *\n * <pre>\n * ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?\n *  12            3  4          5       6  7        8 9\n * </pre>\n *\n * The numbers in the second line above are only to assist readability; they\n * indicate the reference points for each subexpression (i.e., each paired\n * parenthesis). We refer to the value matched for subexpression <n> as $<n>.\n * For example, matching the above expression to\n * <pre>\n *     http://www.ics.uci.edu/pub/ietf/uri/#Related\n * </pre>\n * results in the following subexpression matches:\n * <pre>\n *    $1 = http:\n *    $2 = http\n *    $3 = //www.ics.uci.edu\n *    $4 = www.ics.uci.edu\n *    $5 = /pub/ietf/uri/\n *    $6 = <undefined>\n *    $7 = <undefined>\n *    $8 = #Related\n *    $9 = Related\n * </pre>\n * where <undefined> indicates that the component is not present, as is the\n * case for the query component in the above example. Therefore, we can\n * determine the value of the five components as\n * <pre>\n *    scheme    = $2\n *    authority = $4\n *    path      = $5\n *    query     = $7\n *    fragment  = $9\n * </pre>\n *\n * The regular expression has been modified slightly to expose the\n * userInfo, domain, and port separately from the authority.\n * The modified version yields\n * <pre>\n *    $1 = http              scheme\n *    $2 = <undefined>       userInfo -\\\n *    $3 = www.ics.uci.edu   domain     | authority\n *    $4 = <undefined>       port     -/\n *    $5 = /pub/ietf/uri/    path\n *    $6 = <undefined>       query without ?\n *    $7 = Related           fragment without #\n * </pre>\n *\n * TODO(user): separate out the authority terminating characters once this\n * file is moved to ES6.\n * @type {!RegExp}\n * @private\n */\ngoog.uri.utils.splitRe_ = new RegExp(\n    '^' +  // Anchor against the entire string.\n    '(?:' +\n    '([^:/?#.]+)' +  // scheme - ignore special characters\n                     // used by other URL parts such as :,\n                     // ?, /, #, and .\n    ':)?' +\n    '(?://' +\n    '(?:([^\\\\\\\\/?#]*)@)?' +  // userInfo\n    '([^\\\\\\\\/?#]*?)' +       // domain\n    '(?::([0-9]+))?' +       // port\n    '(?=[\\\\\\\\/?#]|$)' +      // authority-terminating character.\n    ')?' +\n    '([^?#]+)?' +          // path\n    '(?:\\\\?([^#]*))?' +    // query\n    '(?:#([\\\\s\\\\S]*))?' +  // fragment. Can't use '.*' with 's' flag as Firefox\n                           // doesn't support the flag, and can't use an\n                           // \"everything set\" ([^]) as IE10 doesn't match any\n                           // characters with it.\n    '$');\n\n\n/**\n * The index of each URI component in the return value of goog.uri.utils.split.\n * @enum {number}\n */\ngoog.uri.utils.ComponentIndex = {\n  SCHEME: 1,\n  USER_INFO: 2,\n  DOMAIN: 3,\n  PORT: 4,\n  PATH: 5,\n  QUERY_DATA: 6,\n  FRAGMENT: 7\n};\n\n\n/**\n * Splits a URI into its component parts.\n *\n * Each component can be accessed via the component indices; for example:\n * <pre>\n * goog.uri.utils.split(someStr)[goog.uri.utils.ComponentIndex.QUERY_DATA];\n * </pre>\n *\n * @param {string} uri The URI string to examine.\n * @return {!Array<string|undefined>} Each component still URI-encoded.\n *     Each component that is present will contain the encoded value, whereas\n *     components that are not present will be undefined or empty, depending\n *     on the browser's regular expression implementation.  Never null, since\n *     arbitrary strings may still look like path names.\n */\ngoog.uri.utils.split = function(uri) {\n  // See @return comment -- never null.\n  return /** @type {!Array<string|undefined>} */ (\n      uri.match(goog.uri.utils.splitRe_));\n};\n\n\n/**\n * @param {?string} uri A possibly null string.\n * @param {boolean=} opt_preserveReserved If true, percent-encoding of RFC-3986\n *     reserved characters will not be removed.\n * @return {?string} The string URI-decoded, or null if uri is null.\n * @private\n */\ngoog.uri.utils.decodeIfPossible_ = function(uri, opt_preserveReserved) {\n  if (!uri) {\n    return uri;\n  }\n\n  return opt_preserveReserved ? decodeURI(uri) : decodeURIComponent(uri);\n};\n\n\n/**\n * Gets a URI component by index.\n *\n * It is preferred to use the getPathEncoded() variety of functions ahead,\n * since they are more readable.\n *\n * @param {goog.uri.utils.ComponentIndex} componentIndex The component index.\n * @param {string} uri The URI to examine.\n * @return {?string} The still-encoded component, or null if the component\n *     is not present.\n * @private\n */\ngoog.uri.utils.getComponentByIndex_ = function(componentIndex, uri) {\n  // Convert undefined, null, and empty string into null.\n  return goog.uri.utils.split(uri)[componentIndex] || null;\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The protocol or scheme, or null if none.  Does not\n *     include trailing colons or slashes.\n */\ngoog.uri.utils.getScheme = function(uri) {\n  return goog.uri.utils.getComponentByIndex_(\n      goog.uri.utils.ComponentIndex.SCHEME, uri);\n};\n\n\n/**\n * Gets the effective scheme for the URL.  If the URL is relative then the\n * scheme is derived from the page's location.\n * @param {string} uri The URI to examine.\n * @return {string} The protocol or scheme, always lower case.\n */\ngoog.uri.utils.getEffectiveScheme = function(uri) {\n  var scheme = goog.uri.utils.getScheme(uri);\n  if (!scheme && goog.global.self && goog.global.self.location) {\n    var protocol = goog.global.self.location.protocol;\n    scheme = protocol.substr(0, protocol.length - 1);\n  }\n  // NOTE: When called from a web worker in Firefox 3.5, location may be null.\n  // All other browsers with web workers support self.location from the worker.\n  return scheme ? scheme.toLowerCase() : '';\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The user name still encoded, or null if none.\n */\ngoog.uri.utils.getUserInfoEncoded = function(uri) {\n  return goog.uri.utils.getComponentByIndex_(\n      goog.uri.utils.ComponentIndex.USER_INFO, uri);\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The decoded user info, or null if none.\n */\ngoog.uri.utils.getUserInfo = function(uri) {\n  return goog.uri.utils.decodeIfPossible_(\n      goog.uri.utils.getUserInfoEncoded(uri));\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The domain name still encoded, or null if none.\n */\ngoog.uri.utils.getDomainEncoded = function(uri) {\n  return goog.uri.utils.getComponentByIndex_(\n      goog.uri.utils.ComponentIndex.DOMAIN, uri);\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The decoded domain, or null if none.\n */\ngoog.uri.utils.getDomain = function(uri) {\n  return goog.uri.utils.decodeIfPossible_(\n      goog.uri.utils.getDomainEncoded(uri), true /* opt_preserveReserved */);\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?number} The port number, or null if none.\n */\ngoog.uri.utils.getPort = function(uri) {\n  // Coerce to a number.  If the result of getComponentByIndex_ is null or\n  // non-numeric, the number coersion yields NaN.  This will then return\n  // null for all non-numeric cases (though also zero, which isn't a relevant\n  // port number).\n  return Number(\n             goog.uri.utils.getComponentByIndex_(\n                 goog.uri.utils.ComponentIndex.PORT, uri)) ||\n      null;\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The path still encoded, or null if none. Includes the\n *     leading slash, if any.\n */\ngoog.uri.utils.getPathEncoded = function(uri) {\n  return goog.uri.utils.getComponentByIndex_(\n      goog.uri.utils.ComponentIndex.PATH, uri);\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The decoded path, or null if none.  Includes the leading\n *     slash, if any.\n */\ngoog.uri.utils.getPath = function(uri) {\n  return goog.uri.utils.decodeIfPossible_(\n      goog.uri.utils.getPathEncoded(uri), true /* opt_preserveReserved */);\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The query data still encoded, or null if none.  Does not\n *     include the question mark itself.\n */\ngoog.uri.utils.getQueryData = function(uri) {\n  return goog.uri.utils.getComponentByIndex_(\n      goog.uri.utils.ComponentIndex.QUERY_DATA, uri);\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The fragment identifier, or null if none.  Does not\n *     include the hash mark itself.\n */\ngoog.uri.utils.getFragmentEncoded = function(uri) {\n  // The hash mark may not appear in any other part of the URL.\n  var hashIndex = uri.indexOf('#');\n  return hashIndex < 0 ? null : uri.substr(hashIndex + 1);\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @param {?string} fragment The encoded fragment identifier, or null if none.\n *     Does not include the hash mark itself.\n * @return {string} The URI with the fragment set.\n */\ngoog.uri.utils.setFragmentEncoded = function(uri, fragment) {\n  return goog.uri.utils.removeFragment(uri) + (fragment ? '#' + fragment : '');\n};\n\n\n/**\n * @param {string} uri The URI to examine.\n * @return {?string} The decoded fragment identifier, or null if none.  Does\n *     not include the hash mark.\n */\ngoog.uri.utils.getFragment = function(uri) {\n  return goog.uri.utils.decodeIfPossible_(\n      goog.uri.utils.getFragmentEncoded(uri));\n};\n\n\n/**\n * Extracts everything up to the port of the URI.\n * @param {string} uri The URI string.\n * @return {string} Everything up to and including the port.\n */\ngoog.uri.utils.getHost = function(uri) {\n  var pieces = goog.uri.utils.split(uri);\n  return goog.uri.utils.buildFromEncodedParts(\n      pieces[goog.uri.utils.ComponentIndex.SCHEME],\n      pieces[goog.uri.utils.ComponentIndex.USER_INFO],\n      pieces[goog.uri.utils.ComponentIndex.DOMAIN],\n      pieces[goog.uri.utils.ComponentIndex.PORT]);\n};\n\n\n/**\n * Returns the origin for a given URL.\n * @param {string} uri The URI string.\n * @return {string} Everything up to and including the port.\n */\ngoog.uri.utils.getOrigin = function(uri) {\n  var pieces = goog.uri.utils.split(uri);\n  return goog.uri.utils.buildFromEncodedParts(\n      pieces[goog.uri.utils.ComponentIndex.SCHEME], null /* opt_userInfo */,\n      pieces[goog.uri.utils.ComponentIndex.DOMAIN],\n      pieces[goog.uri.utils.ComponentIndex.PORT]);\n};\n\n\n/**\n * Extracts the path of the URL and everything after.\n * @param {string} uri The URI string.\n * @return {string} The URI, starting at the path and including the query\n *     parameters and fragment identifier.\n */\ngoog.uri.utils.getPathAndAfter = function(uri) {\n  var pieces = goog.uri.utils.split(uri);\n  return goog.uri.utils.buildFromEncodedParts(\n      null, null, null, null, pieces[goog.uri.utils.ComponentIndex.PATH],\n      pieces[goog.uri.utils.ComponentIndex.QUERY_DATA],\n      pieces[goog.uri.utils.ComponentIndex.FRAGMENT]);\n};\n\n\n/**\n * Gets the URI with the fragment identifier removed.\n * @param {string} uri The URI to examine.\n * @return {string} Everything preceding the hash mark.\n */\ngoog.uri.utils.removeFragment = function(uri) {\n  // The hash mark may not appear in any other part of the URL.\n  var hashIndex = uri.indexOf('#');\n  return hashIndex < 0 ? uri : uri.substr(0, hashIndex);\n};\n\n\n/**\n * Ensures that two URI's have the exact same domain, scheme, and port.\n *\n * Unlike the version in goog.Uri, this checks protocol, and therefore is\n * suitable for checking against the browser's same-origin policy.\n *\n * @param {string} uri1 The first URI.\n * @param {string} uri2 The second URI.\n * @return {boolean} Whether they have the same scheme, domain and port.\n */\ngoog.uri.utils.haveSameDomain = function(uri1, uri2) {\n  var pieces1 = goog.uri.utils.split(uri1);\n  var pieces2 = goog.uri.utils.split(uri2);\n  return pieces1[goog.uri.utils.ComponentIndex.DOMAIN] ==\n      pieces2[goog.uri.utils.ComponentIndex.DOMAIN] &&\n      pieces1[goog.uri.utils.ComponentIndex.SCHEME] ==\n      pieces2[goog.uri.utils.ComponentIndex.SCHEME] &&\n      pieces1[goog.uri.utils.ComponentIndex.PORT] ==\n      pieces2[goog.uri.utils.ComponentIndex.PORT];\n};\n\n\n/**\n * Asserts that there are no fragment or query identifiers, only in uncompiled\n * mode.\n * @param {string} uri The URI to examine.\n * @private\n */\ngoog.uri.utils.assertNoFragmentsOrQueries_ = function(uri) {\n  goog.asserts.assert(\n      uri.indexOf('#') < 0 && uri.indexOf('?') < 0,\n      'goog.uri.utils: Fragment or query identifiers are not supported: [%s]',\n      uri);\n};\n\n\n/**\n * Supported query parameter values by the parameter serializing utilities.\n *\n * If a value is null or undefined, the key-value pair is skipped, as an easy\n * way to omit parameters conditionally.  Non-array parameters are converted\n * to a string and URI encoded.  Array values are expanded into multiple\n * &key=value pairs, with each element stringized and URI-encoded.\n *\n * @typedef {*}\n */\ngoog.uri.utils.QueryValue;\n\n\n/**\n * An array representing a set of query parameters with alternating keys\n * and values.\n *\n * Keys are assumed to be URI encoded already and live at even indices.  See\n * goog.uri.utils.QueryValue for details on how parameter values are encoded.\n *\n * Example:\n * <pre>\n * var data = [\n *   // Simple param: ?name=BobBarker\n *   'name', 'BobBarker',\n *   // Conditional param -- may be omitted entirely.\n *   'specialDietaryNeeds', hasDietaryNeeds() ? getDietaryNeeds() : null,\n *   // Multi-valued param: &house=LosAngeles&house=NewYork&house=null\n *   'house', ['LosAngeles', 'NewYork', null]\n * ];\n * </pre>\n *\n * @typedef {!Array<string|goog.uri.utils.QueryValue>}\n */\ngoog.uri.utils.QueryArray;\n\n\n/**\n * Parses encoded query parameters and calls callback function for every\n * parameter found in the string.\n *\n * Missing value of parameter (e.g. “…&key&…”) is treated as if the value was an\n * empty string.  Keys may be empty strings (e.g. “…&=value&…”) which also means\n * that “…&=&…” and “…&&…” will result in an empty key and value.\n *\n * @param {string} encodedQuery Encoded query string excluding question mark at\n *     the beginning.\n * @param {function(string, string)} callback Function called for every\n *     parameter found in query string.  The first argument (name) will not be\n *     urldecoded (so the function is consistent with buildQueryData), but the\n *     second will.  If the parameter has no value (i.e. “=” was not present)\n *     the second argument (value) will be an empty string.\n */\ngoog.uri.utils.parseQueryData = function(encodedQuery, callback) {\n  if (!encodedQuery) {\n    return;\n  }\n  var pairs = encodedQuery.split('&');\n  for (var i = 0; i < pairs.length; i++) {\n    var indexOfEquals = pairs[i].indexOf('=');\n    var name = null;\n    var value = null;\n    if (indexOfEquals >= 0) {\n      name = pairs[i].substring(0, indexOfEquals);\n      value = pairs[i].substring(indexOfEquals + 1);\n    } else {\n      name = pairs[i];\n    }\n    callback(name, value ? goog.string.urlDecode(value) : '');\n  }\n};\n\n\n/**\n * Split the URI into 3 parts where the [1] is the queryData without a leading\n * '?'. For example, the URI http://foo.com/bar?a=b#abc returns\n * ['http://foo.com/bar','a=b','#abc'].\n * @param {string} uri The URI to parse.\n * @return {!Array<string>} An array representation of uri of length 3 where the\n *     middle value is the queryData without a leading '?'.\n * @private\n */\ngoog.uri.utils.splitQueryData_ = function(uri) {\n  // Find the query data and hash.\n  var hashIndex = uri.indexOf('#');\n  if (hashIndex < 0) {\n    hashIndex = uri.length;\n  }\n  var questionIndex = uri.indexOf('?');\n  var queryData;\n  if (questionIndex < 0 || questionIndex > hashIndex) {\n    questionIndex = hashIndex;\n    queryData = '';\n  } else {\n    queryData = uri.substring(questionIndex + 1, hashIndex);\n  }\n  return [uri.substr(0, questionIndex), queryData, uri.substr(hashIndex)];\n};\n\n\n/**\n * Join an array created by splitQueryData_ back into a URI.\n * @param {!Array<string>} parts A URI in the form generated by splitQueryData_.\n * @return {string} The joined URI.\n * @private\n */\ngoog.uri.utils.joinQueryData_ = function(parts) {\n  return parts[0] + (parts[1] ? '?' + parts[1] : '') + parts[2];\n};\n\n\n/**\n * @param {string} queryData\n * @param {string} newData\n * @return {string}\n * @private\n */\ngoog.uri.utils.appendQueryData_ = function(queryData, newData) {\n  if (!newData) {\n    return queryData;\n  }\n  return queryData ? queryData + '&' + newData : newData;\n};\n\n\n/**\n * @param {string} uri\n * @param {string} queryData\n * @return {string}\n * @private\n */\ngoog.uri.utils.appendQueryDataToUri_ = function(uri, queryData) {\n  if (!queryData) {\n    return uri;\n  }\n  var parts = goog.uri.utils.splitQueryData_(uri);\n  parts[1] = goog.uri.utils.appendQueryData_(parts[1], queryData);\n  return goog.uri.utils.joinQueryData_(parts);\n};\n\n\n/**\n * Appends key=value pairs to an array, supporting multi-valued objects.\n * @param {*} key The key prefix.\n * @param {goog.uri.utils.QueryValue} value The value to serialize.\n * @param {!Array<string>} pairs The array to which the 'key=value' strings\n *     should be appended.\n * @private\n */\ngoog.uri.utils.appendKeyValuePairs_ = function(key, value, pairs) {\n  goog.asserts.assertString(key);\n  if (Array.isArray(value)) {\n    // Convince the compiler it's an array.\n    goog.asserts.assertArray(value);\n    for (var j = 0; j < value.length; j++) {\n      // Convert to string explicitly, to short circuit the null and array\n      // logic in this function -- this ensures that null and undefined get\n      // written as literal 'null' and 'undefined', and arrays don't get\n      // expanded out but instead encoded in the default way.\n      goog.uri.utils.appendKeyValuePairs_(key, String(value[j]), pairs);\n    }\n  } else if (value != null) {\n    // Skip a top-level null or undefined entirely.\n    pairs.push(\n        key +\n        // Check for empty string. Zero gets encoded into the url as literal\n        // strings.  For empty string, skip the equal sign, to be consistent\n        // with UriBuilder.java.\n        (value === '' ? '' : '=' + goog.string.urlEncode(value)));\n  }\n};\n\n\n/**\n * Builds a query data string from a sequence of alternating keys and values.\n * Currently generates \"&key&\" for empty args.\n *\n * @param {!IArrayLike<string|goog.uri.utils.QueryValue>} keysAndValues\n *     Alternating keys and values. See the QueryArray typedef.\n * @param {number=} opt_startIndex A start offset into the arary, defaults to 0.\n * @return {string} The encoded query string, in the form 'a=1&b=2'.\n */\ngoog.uri.utils.buildQueryData = function(keysAndValues, opt_startIndex) {\n  goog.asserts.assert(\n      Math.max(keysAndValues.length - (opt_startIndex || 0), 0) % 2 == 0,\n      'goog.uri.utils: Key/value lists must be even in length.');\n\n  var params = [];\n  for (var i = opt_startIndex || 0; i < keysAndValues.length; i += 2) {\n    var key = /** @type {string} */ (keysAndValues[i]);\n    goog.uri.utils.appendKeyValuePairs_(key, keysAndValues[i + 1], params);\n  }\n  return params.join('&');\n};\n\n\n/**\n * Builds a query data string from a map.\n * Currently generates \"&key&\" for empty args.\n *\n * @param {!Object<string, goog.uri.utils.QueryValue>} map An object where keys\n *     are URI-encoded parameter keys, and the values are arbitrary types\n *     or arrays. Keys with a null value are dropped.\n * @return {string} The encoded query string, in the form 'a=1&b=2'.\n */\ngoog.uri.utils.buildQueryDataFromMap = function(map) {\n  var params = [];\n  for (var key in map) {\n    goog.uri.utils.appendKeyValuePairs_(key, map[key], params);\n  }\n  return params.join('&');\n};\n\n\n/**\n * Appends URI parameters to an existing URI.\n *\n * The variable arguments may contain alternating keys and values.  Keys are\n * assumed to be already URI encoded.  The values should not be URI-encoded,\n * and will instead be encoded by this function.\n * <pre>\n * appendParams('http://www.foo.com?existing=true',\n *     'key1', 'value1',\n *     'key2', 'value?willBeEncoded',\n *     'key3', ['valueA', 'valueB', 'valueC'],\n *     'key4', null);\n * result: 'http://www.foo.com?existing=true&' +\n *     'key1=value1&' +\n *     'key2=value%3FwillBeEncoded&' +\n *     'key3=valueA&key3=valueB&key3=valueC'\n * </pre>\n *\n * A single call to this function will not exhibit quadratic behavior in IE,\n * whereas multiple repeated calls may, although the effect is limited by\n * fact that URL's generally can't exceed 2kb.\n *\n * @param {string} uri The original URI, which may already have query data.\n * @param {...(goog.uri.utils.QueryArray|goog.uri.utils.QueryValue)}\n * var_args\n *     An array or argument list conforming to goog.uri.utils.QueryArray.\n * @return {string} The URI with all query parameters added.\n */\ngoog.uri.utils.appendParams = function(uri, var_args) {\n  var queryData = arguments.length == 2 ?\n      goog.uri.utils.buildQueryData(arguments[1], 0) :\n      goog.uri.utils.buildQueryData(arguments, 1);\n  return goog.uri.utils.appendQueryDataToUri_(uri, queryData);\n};\n\n\n/**\n * Appends query parameters from a map.\n *\n * @param {string} uri The original URI, which may already have query data.\n * @param {!Object<goog.uri.utils.QueryValue>} map An object where keys are\n *     URI-encoded parameter keys, and the values are arbitrary types or arrays.\n *     Keys with a null value are dropped.\n * @return {string} The new parameters.\n */\ngoog.uri.utils.appendParamsFromMap = function(uri, map) {\n  var queryData = goog.uri.utils.buildQueryDataFromMap(map);\n  return goog.uri.utils.appendQueryDataToUri_(uri, queryData);\n};\n\n\n/**\n * Appends a single URI parameter.\n *\n * Repeated calls to this can exhibit quadratic behavior in IE6 due to the\n * way string append works, though it should be limited given the 2kb limit.\n *\n * @param {string} uri The original URI, which may already have query data.\n * @param {string} key The key, which must already be URI encoded.\n * @param {*=} opt_value The value, which will be stringized and encoded\n *     (assumed not already to be encoded).  If omitted, undefined, or null, the\n *     key will be added as a valueless parameter.\n * @return {string} The URI with the query parameter added.\n */\ngoog.uri.utils.appendParam = function(uri, key, opt_value) {\n  var value = (opt_value != null) ? '=' + goog.string.urlEncode(opt_value) : '';\n  return goog.uri.utils.appendQueryDataToUri_(uri, key + value);\n};\n\n\n/**\n * Finds the next instance of a query parameter with the specified name.\n *\n * Does not instantiate any objects.\n *\n * @param {string} uri The URI to search.  May contain a fragment identifier\n *     if opt_hashIndex is specified.\n * @param {number} startIndex The index to begin searching for the key at.  A\n *     match may be found even if this is one character after the ampersand.\n * @param {string} keyEncoded The URI-encoded key.\n * @param {number} hashOrEndIndex Index to stop looking at.  If a hash\n *     mark is present, it should be its index, otherwise it should be the\n *     length of the string.\n * @return {number} The position of the first character in the key's name,\n *     immediately after either a question mark or a dot.\n * @private\n */\ngoog.uri.utils.findParam_ = function(\n    uri, startIndex, keyEncoded, hashOrEndIndex) {\n  var index = startIndex;\n  var keyLength = keyEncoded.length;\n\n  // Search for the key itself and post-filter for surronuding punctuation,\n  // rather than expensively building a regexp.\n  while ((index = uri.indexOf(keyEncoded, index)) >= 0 &&\n         index < hashOrEndIndex) {\n    var precedingChar = uri.charCodeAt(index - 1);\n    // Ensure that the preceding character is '&' or '?'.\n    if (precedingChar == goog.uri.utils.CharCode_.AMPERSAND ||\n        precedingChar == goog.uri.utils.CharCode_.QUESTION) {\n      // Ensure the following character is '&', '=', '#', or NaN\n      // (end of string).\n      var followingChar = uri.charCodeAt(index + keyLength);\n      if (!followingChar || followingChar == goog.uri.utils.CharCode_.EQUAL ||\n          followingChar == goog.uri.utils.CharCode_.AMPERSAND ||\n          followingChar == goog.uri.utils.CharCode_.HASH) {\n        return index;\n      }\n    }\n    index += keyLength + 1;\n  }\n\n  return -1;\n};\n\n\n/**\n * Regular expression for finding a hash mark or end of string.\n * @type {RegExp}\n * @private\n */\ngoog.uri.utils.hashOrEndRe_ = /#|$/;\n\n\n/**\n * Determines if the URI contains a specific key.\n *\n * Performs no object instantiations.\n *\n * @param {string} uri The URI to process.  May contain a fragment\n *     identifier.\n * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.\n * @return {boolean} Whether the key is present.\n */\ngoog.uri.utils.hasParam = function(uri, keyEncoded) {\n  return goog.uri.utils.findParam_(\n             uri, 0, keyEncoded, uri.search(goog.uri.utils.hashOrEndRe_)) >= 0;\n};\n\n\n/**\n * Gets the first value of a query parameter.\n * @param {string} uri The URI to process.  May contain a fragment.\n * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.\n * @return {?string} The first value of the parameter (URI-decoded), or null\n *     if the parameter is not found.\n */\ngoog.uri.utils.getParamValue = function(uri, keyEncoded) {\n  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);\n  var foundIndex =\n      goog.uri.utils.findParam_(uri, 0, keyEncoded, hashOrEndIndex);\n\n  if (foundIndex < 0) {\n    return null;\n  } else {\n    var endPosition = uri.indexOf('&', foundIndex);\n    if (endPosition < 0 || endPosition > hashOrEndIndex) {\n      endPosition = hashOrEndIndex;\n    }\n    // Progress forth to the end of the \"key=\" or \"key&\" substring.\n    foundIndex += keyEncoded.length + 1;\n    // Use substr, because it (unlike substring) will return empty string\n    // if foundIndex > endPosition.\n    return goog.string.urlDecode(\n        uri.substr(foundIndex, endPosition - foundIndex));\n  }\n};\n\n\n/**\n * Gets all values of a query parameter.\n * @param {string} uri The URI to process.  May contain a fragment.\n * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.\n * @return {!Array<string>} All URI-decoded values with the given key.\n *     If the key is not found, this will have length 0, but never be null.\n */\ngoog.uri.utils.getParamValues = function(uri, keyEncoded) {\n  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);\n  var position = 0;\n  var foundIndex;\n  var result = [];\n\n  while ((foundIndex = goog.uri.utils.findParam_(\n              uri, position, keyEncoded, hashOrEndIndex)) >= 0) {\n    // Find where this parameter ends, either the '&' or the end of the\n    // query parameters.\n    position = uri.indexOf('&', foundIndex);\n    if (position < 0 || position > hashOrEndIndex) {\n      position = hashOrEndIndex;\n    }\n\n    // Progress forth to the end of the \"key=\" or \"key&\" substring.\n    foundIndex += keyEncoded.length + 1;\n    // Use substr, because it (unlike substring) will return empty string\n    // if foundIndex > position.\n    result.push(\n        goog.string.urlDecode(uri.substr(foundIndex, position - foundIndex)));\n  }\n\n  return result;\n};\n\n\n/**\n * Regexp to find trailing question marks and ampersands.\n * @type {RegExp}\n * @private\n */\ngoog.uri.utils.trailingQueryPunctuationRe_ = /[?&]($|#)/;\n\n\n/**\n * Removes all instances of a query parameter.\n * @param {string} uri The URI to process.  Must not contain a fragment.\n * @param {string} keyEncoded The URI-encoded key.\n * @return {string} The URI with all instances of the parameter removed.\n */\ngoog.uri.utils.removeParam = function(uri, keyEncoded) {\n  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);\n  var position = 0;\n  var foundIndex;\n  var buffer = [];\n\n  // Look for a query parameter.\n  while ((foundIndex = goog.uri.utils.findParam_(\n              uri, position, keyEncoded, hashOrEndIndex)) >= 0) {\n    // Get the portion of the query string up to, but not including, the ?\n    // or & starting the parameter.\n    buffer.push(uri.substring(position, foundIndex));\n    // Progress to immediately after the '&'.  If not found, go to the end.\n    // Avoid including the hash mark.\n    position = Math.min(\n        (uri.indexOf('&', foundIndex) + 1) || hashOrEndIndex, hashOrEndIndex);\n  }\n\n  // Append everything that is remaining.\n  buffer.push(uri.substr(position));\n\n  // Join the buffer, and remove trailing punctuation that remains.\n  return buffer.join('').replace(\n      goog.uri.utils.trailingQueryPunctuationRe_, '$1');\n};\n\n\n/**\n * Replaces all existing definitions of a parameter with a single definition.\n *\n * Repeated calls to this can exhibit quadratic behavior due to the need to\n * find existing instances and reconstruct the string, though it should be\n * limited given the 2kb limit.  Consider using appendParams or setParamsFromMap\n * to update multiple parameters in bulk.\n *\n * @param {string} uri The original URI, which may already have query data.\n * @param {string} keyEncoded The key, which must already be URI encoded.\n * @param {*} value The value, which will be stringized and encoded (assumed\n *     not already to be encoded).\n * @return {string} The URI with the query parameter added.\n */\ngoog.uri.utils.setParam = function(uri, keyEncoded, value) {\n  return goog.uri.utils.appendParam(\n      goog.uri.utils.removeParam(uri, keyEncoded), keyEncoded, value);\n};\n\n\n/**\n * Effeciently set or remove multiple query parameters in a URI. Order of\n * unchanged parameters will not be modified, all updated parameters will be\n * appended to the end of the query. Params with values of null or undefined are\n * removed.\n *\n * @param {string} uri The URI to process.\n * @param {!Object<string, goog.uri.utils.QueryValue>} params A list of\n *     parameters to update. If null or undefined, the param will be removed.\n * @return {string} An updated URI where the query data has been updated with\n *     the params.\n */\ngoog.uri.utils.setParamsFromMap = function(uri, params) {\n  var parts = goog.uri.utils.splitQueryData_(uri);\n  var queryData = parts[1];\n  var buffer = [];\n  if (queryData) {\n    goog.array.forEach(queryData.split('&'), function(pair) {\n      var indexOfEquals = pair.indexOf('=');\n      var name = indexOfEquals >= 0 ? pair.substr(0, indexOfEquals) : pair;\n      if (!params.hasOwnProperty(name)) {\n        buffer.push(pair);\n      }\n    });\n  }\n  parts[1] = goog.uri.utils.appendQueryData_(\n      buffer.join('&'), goog.uri.utils.buildQueryDataFromMap(params));\n  return goog.uri.utils.joinQueryData_(parts);\n};\n\n\n/**\n * Generates a URI path using a given URI and a path with checks to\n * prevent consecutive \"//\". The baseUri passed in must not contain\n * query or fragment identifiers. The path to append may not contain query or\n * fragment identifiers.\n *\n * @param {string} baseUri URI to use as the base.\n * @param {string} path Path to append.\n * @return {string} Updated URI.\n */\ngoog.uri.utils.appendPath = function(baseUri, path) {\n  goog.uri.utils.assertNoFragmentsOrQueries_(baseUri);\n\n  // Remove any trailing '/'\n  if (goog.string.endsWith(baseUri, '/')) {\n    baseUri = baseUri.substr(0, baseUri.length - 1);\n  }\n  // Remove any leading '/'\n  if (goog.string.startsWith(path, '/')) {\n    path = path.substr(1);\n  }\n  return goog.string.buildString(baseUri, '/', path);\n};\n\n\n/**\n * Replaces the path.\n * @param {string} uri URI to use as the base.\n * @param {string} path New path.\n * @return {string} Updated URI.\n */\ngoog.uri.utils.setPath = function(uri, path) {\n  // Add any missing '/'.\n  if (!goog.string.startsWith(path, '/')) {\n    path = '/' + path;\n  }\n  var parts = goog.uri.utils.split(uri);\n  return goog.uri.utils.buildFromEncodedParts(\n      parts[goog.uri.utils.ComponentIndex.SCHEME],\n      parts[goog.uri.utils.ComponentIndex.USER_INFO],\n      parts[goog.uri.utils.ComponentIndex.DOMAIN],\n      parts[goog.uri.utils.ComponentIndex.PORT], path,\n      parts[goog.uri.utils.ComponentIndex.QUERY_DATA],\n      parts[goog.uri.utils.ComponentIndex.FRAGMENT]);\n};\n\n\n/**\n * Standard supported query parameters.\n * @enum {string}\n */\ngoog.uri.utils.StandardQueryParam = {\n\n  /** Unused parameter for unique-ifying. */\n  RANDOM: 'zx'\n};\n\n\n/**\n * Sets the zx parameter of a URI to a random value.\n * @param {string} uri Any URI.\n * @return {string} That URI with the \"zx\" parameter added or replaced to\n *     contain a random string.\n */\ngoog.uri.utils.makeUnique = function(uri) {\n  return goog.uri.utils.setParam(\n      uri, goog.uri.utils.StandardQueryParam.RANDOM,\n      goog.string.getRandomString());\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Interface and shared data structures for implementing\n * different wire protocol versions.\n */\ngoog.provide('goog.labs.net.webChannel.Wire');\n\ngoog.requireType('goog.structs.Map');\n\n\n\n/**\n * The interface class.\n *\n * @interface\n */\ngoog.labs.net.webChannel.Wire = function() {};\n\n\n/**\n * The latest protocol version that this class supports. We request this version\n * from the server when opening the connection. Should match\n * LATEST_CHANNEL_VERSION on the server code.\n * @type {number}\n */\ngoog.labs.net.webChannel.Wire.LATEST_CHANNEL_VERSION = 8;\n\n\n/**\n * The JSON field key for the raw data wrapper object.\n * @type {string}\n */\ngoog.labs.net.webChannel.Wire.RAW_DATA_KEY = '__data__';\n\n\n\n/**\n * Simple container class for a (mapId, map) pair.\n * @param {number} mapId The id for this map.\n * @param {!Object|!goog.structs.Map} map The map itself.\n * @param {!Object=} opt_context The context associated with the map.\n * @constructor\n * @struct\n */\ngoog.labs.net.webChannel.Wire.QueuedMap = function(mapId, map, opt_context) {\n  /**\n   * The id for this map.\n   * @type {number}\n   */\n  this.mapId = mapId;\n\n  /**\n   * The map itself.\n   * @type {!Object|!goog.structs.Map}\n   */\n  this.map = map;\n\n  /**\n   * The context for the map.\n   * @type {Object}\n   */\n  this.context = opt_context || null;\n};\n\n\n/**\n * @return {number|undefined} the size of the raw JSON message or\n * undefined if the message is not encoded as a raw JSON message\n */\ngoog.labs.net.webChannel.Wire.QueuedMap.prototype.getRawDataSize = function() {\n  if (goog.labs.net.webChannel.Wire.RAW_DATA_KEY in this.map) {\n    const data = this.map[goog.labs.net.webChannel.Wire.RAW_DATA_KEY];\n    if (typeof data === 'string') {\n      return data.length;\n    }\n  }\n\n  return undefined;\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n\n/**\n * @fileoverview Defines a class for parsing JSON using the browser's built in\n * JSON library.\n */\n\ngoog.provide('goog.json.NativeJsonProcessor');\n\ngoog.require('goog.asserts');\ngoog.require('goog.json.Processor');\n\n\n\n/**\n * A class that parses and stringifies JSON using the browser's built-in JSON\n * library, if it is available.\n *\n * Note that the native JSON api has subtle differences across browsers, so\n * use this implementation with care.  See json_test#assertSerialize\n * for details on the differences from goog.json.\n *\n * This implementation is signficantly faster than goog.json, at least on\n * Chrome.  See json_perf.html for a perf test showing the difference.\n *\n * @param {?goog.json.Replacer=} opt_replacer An optional replacer to use during\n *     serialization.\n * @param {?goog.json.Reviver=} opt_reviver An optional reviver to use during\n *     parsing.\n * @constructor\n * @implements {goog.json.Processor}\n * @final\n */\ngoog.json.NativeJsonProcessor = function(opt_replacer, opt_reviver) {\n  goog.asserts.assert(goog.global['JSON'] !== undefined, 'JSON not defined');\n\n  /**\n   * @type {goog.json.Replacer|null|undefined}\n   * @private\n   */\n  this.replacer_ = opt_replacer;\n\n  /**\n   * @type {goog.json.Reviver|null|undefined}\n   * @private\n   */\n  this.reviver_ = opt_reviver;\n};\n\n\n/** @override */\ngoog.json.NativeJsonProcessor.prototype.stringify = function(object) {\n  return goog.global['JSON'].stringify(object, this.replacer_);\n};\n\n\n/** @override */\ngoog.json.NativeJsonProcessor.prototype.parse = function(s) {\n  return goog.global['JSON'].parse(s, this.reviver_);\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Codec functions of the v8 wire protocol. Eventually we'd want\n * to support pluggable wire-format to improve wire efficiency and to enable\n * binary encoding. Such support will require an interface class, which\n * will be added later.\n *\n */\n\n\ngoog.provide('goog.labs.net.webChannel.WireV8');\n\ngoog.require('goog.asserts');\ngoog.require('goog.json');\ngoog.require('goog.json.NativeJsonProcessor');\ngoog.require('goog.labs.net.webChannel.Wire');\ngoog.require('goog.structs');\ngoog.requireType('goog.structs.Map');\n\n\n\n/**\n * The v8 codec class.\n *\n * @constructor\n * @struct\n */\ngoog.labs.net.webChannel.WireV8 = function() {\n  /**\n   * Parser for a response payload. The parser should return an array.\n   * @private {!goog.string.Parser}\n   */\n  this.parser_ = new goog.json.NativeJsonProcessor();\n};\n\n\ngoog.scope(function() {\nvar WireV8 = goog.labs.net.webChannel.WireV8;\nvar Wire = goog.labs.net.webChannel.Wire;\n\n\n/**\n * Encodes a standalone message into the wire format.\n *\n * May throw exception if the message object contains any invalid elements.\n *\n * @param {!Object|!goog.structs.Map} message The message data.\n *     V8 only support JS objects (or Map).\n * @param {!Array<string>} buffer The text buffer to write the message to.\n * @param {string=} opt_prefix The prefix for each field of the object.\n */\nWireV8.prototype.encodeMessage = function(message, buffer, opt_prefix) {\n  var prefix = opt_prefix || '';\n  try {\n    goog.structs.forEach(message, function(value, key) {\n      var encodedValue = value;\n      if (goog.isObject(value)) {\n        encodedValue = goog.json.serialize(value);\n      }  // keep the fast-path for primitive types\n      buffer.push(prefix + key + '=' + encodeURIComponent(encodedValue));\n    });\n  } catch (ex) {\n    // We send a map here because lots of the retry logic relies on map IDs,\n    // so we have to send something (possibly redundant).\n    buffer.push(\n        prefix + 'type' +\n        '=' + encodeURIComponent('_badmap'));\n    throw ex;\n  }\n};\n\n\n/**\n * Encodes all the buffered messages of the forward channel.\n *\n * @param {!Array<Wire.QueuedMap>} messageQueue The message data.\n *     V8 only support JS objects.\n * @param {number} count The number of messages to be encoded.\n * @param {?function(!Object)} badMapHandler Callback for bad messages.\n * @return {string} the encoded messages\n */\nWireV8.prototype.encodeMessageQueue = function(\n    messageQueue, count, badMapHandler) {\n  var offset = -1;\n  while (true) {\n    var sb = ['count=' + count];\n    // To save a bit of bandwidth, specify the base mapId and the rest as\n    // offsets from it.\n    if (offset == -1) {\n      if (count > 0) {\n        offset = messageQueue[0].mapId;\n        sb.push('ofs=' + offset);\n      } else {\n        offset = 0;\n      }\n    } else {\n      sb.push('ofs=' + offset);\n    }\n    var done = true;\n    for (var i = 0; i < count; i++) {\n      var mapId = messageQueue[i].mapId;\n      var map = messageQueue[i].map;\n      mapId -= offset;\n      if (mapId < 0) {\n        // redo the encoding in case of retry/reordering, plus extra space\n        offset = Math.max(0, messageQueue[i].mapId - 100);\n        done = false;\n        continue;\n      }\n      try {\n        this.encodeMessage(map, sb, 'req' + mapId + '_');\n      } catch (ex) {\n        if (badMapHandler) {\n          badMapHandler(map);\n        }\n      }\n    }\n    if (done) {\n      return sb.join('&');\n    }\n  }\n};\n\n\n/**\n * Decodes a standalone message received from the wire. May throw exception\n * if text is ill-formatted.\n *\n * Must be valid JSON as it is insecure to use eval() to decode JS literals;\n * and eval() is disallowed in Chrome apps too.\n *\n * Invalid JS literals include null array elements, quotas etc.\n *\n * @param {string} messageText The string content as received from the wire.\n * @return {*} The decoded message object.\n */\nWireV8.prototype.decodeMessage = function(messageText) {\n  var response = this.parser_.parse(messageText);\n  goog.asserts.assert(Array.isArray(response));  // throw exception\n  return response;\n};\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Utility functions for managing networking, such as\n * testing network connectivity.\n *\n */\n\n\ngoog.provide('goog.labs.net.webChannel.netUtils');\n\ngoog.require('goog.Uri');\ngoog.require('goog.labs.net.webChannel.WebChannelDebug');\n\ngoog.scope(function() {\nvar netUtils = goog.labs.net.webChannel.netUtils;\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\n\n\n/**\n * Default timeout to allow for URI pings.\n * @type {number}\n */\nnetUtils.NETWORK_TIMEOUT = 10000;\n\n\n/**\n * Pings the network with an image URI to check if an error is a server error\n * or user's network error.\n *\n * The caller needs to add a 'rand' parameter to make sure the response is\n * not fulfilled by browser cache.\n *\n * @param {function(boolean)} callback The function to call back with results.\n * @param {goog.Uri=} opt_imageUri The URI (of an image) to use for the network\n *     test.\n */\nnetUtils.testNetwork = function(callback, opt_imageUri) {\n  var uri = opt_imageUri;\n  if (!uri) {\n    // default google.com image\n    uri = new goog.Uri('//www.google.com/images/cleardot.gif');\n\n    if (!(goog.global.location && goog.global.location.protocol == 'http')) {\n      uri.setScheme('https');  // e.g. chrome-extension\n    }\n    uri.makeUnique();\n  }\n\n  netUtils.testLoadImage(uri.toString(), netUtils.NETWORK_TIMEOUT, callback);\n};\n\n\n/**\n * Test loading the given image, retrying if necessary.\n * @param {string} url URL to the image.\n * @param {number} timeout Milliseconds before giving up.\n * @param {function(boolean)} callback Function to call with results.\n * @param {number} retries The number of times to retry.\n * @param {!WebChannelDebug} channelDebug The debug object\n * @param {number=} opt_pauseBetweenRetriesMS Optional number of milliseconds\n *     between retries - defaults to 0.\n */\nnetUtils.testLoadImageWithRetries = function(\n    url, timeout, callback, retries, channelDebug, opt_pauseBetweenRetriesMS) {\n  channelDebug.debug('TestLoadImageWithRetries: ' + opt_pauseBetweenRetriesMS);\n  if (retries == 0) {\n    // no more retries, give up\n    callback(false);\n    return;\n  }\n\n  var pauseBetweenRetries = opt_pauseBetweenRetriesMS || 0;\n  retries--;\n  netUtils.testLoadImage(url, timeout, function(succeeded) {\n    if (succeeded) {\n      callback(true);\n    } else {\n      // try again\n      goog.global.setTimeout(function() {\n        netUtils.testLoadImageWithRetries(\n            url, timeout, callback, retries, channelDebug, pauseBetweenRetries);\n      }, pauseBetweenRetries);\n    }\n  });\n};\n\n\n/**\n * Test loading the given image.\n * @param {string} url URL to the image.\n * @param {number} timeout Milliseconds before giving up.\n * @param {function(boolean)} callback Function to call with results.\n * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration\n */\nnetUtils.testLoadImage = function(url, timeout, callback) {\n  var channelDebug = new WebChannelDebug();\n  channelDebug.debug('TestLoadImage: loading ' + url);\n  if (goog.global.Image) {\n    var img = new Image();\n    img.onload = goog.partial(\n        netUtils.imageCallback_, channelDebug, img, 'TestLoadImage: loaded',\n        true, callback);\n    img.onerror = goog.partial(\n        netUtils.imageCallback_, channelDebug, img, 'TestLoadImage: error',\n        false, callback);\n    img.onabort = goog.partial(\n        netUtils.imageCallback_, channelDebug, img, 'TestLoadImage: abort',\n        false, callback);\n    img.ontimeout = goog.partial(\n        netUtils.imageCallback_, channelDebug, img, 'TestLoadImage: timeout',\n        false, callback);\n\n    goog.global.setTimeout(function() {\n      if (img.ontimeout) {\n        img.ontimeout();\n      }\n    }, timeout);\n    img.src = url;\n  } else {\n    // log ERROR_OTHER from environements where Image is not supported\n    callback(false);\n  }\n};\n\n\n/**\n * Wrap the image callback with debug and cleanup logic.\n * @param {!WebChannelDebug} channelDebug The WebChannelDebug object.\n * @param {!Image} img The image element.\n * @param {string} debugText The debug text.\n * @param {boolean} result The result of image loading.\n * @param {function(boolean)} callback The image callback.\n * @private\n */\nnetUtils.imageCallback_ = function(\n    channelDebug, img, debugText, result, callback) {\n  try {\n    channelDebug.debug(debugText);\n    netUtils.clearImageCallbacks_(img);\n    callback(result);\n  } catch (e) {\n    channelDebug.dumpException(e);\n  }\n};\n\n\n/**\n * Clears handlers to avoid memory leaks.\n * @param {Image} img The image to clear handlers from.\n * @private\n * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration\n */\nnetUtils.clearImageCallbacks_ = function(img) {\n  img.onload = null;\n  img.onerror = null;\n  img.onabort = null;\n  img.ontimeout = null;\n};\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n\n/**\n * @fileoverview Utility to attempt native JSON processing, falling back to\n *     goog.json if not available.\n *\n *     This is intended as a drop-in for current users of goog.json who want\n *     to take advantage of native JSON if present.\n */\n\ngoog.provide('goog.json.hybrid');\n\ngoog.require('goog.asserts');\ngoog.require('goog.json');\n\n\n/**\n * Attempts to serialize the JSON string natively, falling back to\n * `goog.json.serialize` if unsuccessful.\n * @param {!Object} obj JavaScript object to serialize to JSON.\n * @return {string} Resulting JSON string.\n */\ngoog.json.hybrid.stringify =\n    goog.json.USE_NATIVE_JSON ? goog.global['JSON']['stringify'] : function(\n                                                                       obj) {\n      if (goog.global.JSON) {\n        try {\n          return goog.global.JSON.stringify(obj);\n        } catch (e) {\n          // Native serialization failed.  Fall through to retry with\n          // goog.json.serialize.\n        }\n      }\n\n      return goog.json.serialize(obj);\n    };\n\n\n/**\n * Attempts to parse the JSON string natively, falling back to\n * the supplied `fallbackParser` if unsuccessful.\n * @param {string} jsonString JSON string to parse.\n * @param {function(string):Object} fallbackParser Fallback JSON parser used\n *     if native\n * @return {?Object} Resulting JSON object.\n * @private\n */\ngoog.json.hybrid.parse_ = function(jsonString, fallbackParser) {\n  if (goog.global.JSON) {\n    try {\n      var obj = goog.global.JSON.parse(jsonString);\n      goog.asserts.assert(typeof obj == 'object');\n      return /** @type {?Object} */ (obj);\n    } catch (e) {\n      // Native parse failed.  Fall through to retry with goog.json.parse.\n    }\n  }\n\n  return fallbackParser(jsonString);\n};\n\n\n/**\n * Attempts to parse the JSON string natively, falling back to\n * `goog.json.parse` if unsuccessful.\n * @param {string} jsonString JSON string to parse.\n * @return {?Object} Resulting JSON object.\n */\ngoog.json.hybrid.parse =\n    goog.json.USE_NATIVE_JSON ? goog.global['JSON']['parse'] : function(\n                                                                   jsonString) {\n      return goog.json.hybrid.parse_(jsonString, goog.json.parse);\n    };\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Constants for HTTP status codes.\n */\n\ngoog.provide('goog.net.HttpStatus');\n\n\n/**\n * HTTP Status Codes defined in RFC 2616, RFC 6585, RFC 4918 and RFC 7538.\n * @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html\n * @see http://tools.ietf.org/html/rfc6585\n * @see https://tools.ietf.org/html/rfc4918\n * @see https://tools.ietf.org/html/rfc7538\n * @enum {number}\n */\ngoog.net.HttpStatus = {\n  // Informational 1xx\n  CONTINUE: 100,\n  SWITCHING_PROTOCOLS: 101,\n\n  // Successful 2xx\n  OK: 200,\n  CREATED: 201,\n  ACCEPTED: 202,\n  NON_AUTHORITATIVE_INFORMATION: 203,\n  NO_CONTENT: 204,\n  RESET_CONTENT: 205,\n  PARTIAL_CONTENT: 206,\n  MULTI_STATUS: 207,\n\n  // Redirection 3xx\n  MULTIPLE_CHOICES: 300,\n  MOVED_PERMANENTLY: 301,\n  FOUND: 302,\n  SEE_OTHER: 303,\n  NOT_MODIFIED: 304,\n  USE_PROXY: 305,\n  TEMPORARY_REDIRECT: 307,\n  PERMANENT_REDIRECT: 308,\n\n  // Client Error 4xx\n  BAD_REQUEST: 400,\n  UNAUTHORIZED: 401,\n  PAYMENT_REQUIRED: 402,\n  FORBIDDEN: 403,\n  NOT_FOUND: 404,\n  METHOD_NOT_ALLOWED: 405,\n  NOT_ACCEPTABLE: 406,\n  PROXY_AUTHENTICATION_REQUIRED: 407,\n  REQUEST_TIMEOUT: 408,\n  CONFLICT: 409,\n  GONE: 410,\n  LENGTH_REQUIRED: 411,\n  PRECONDITION_FAILED: 412,\n  REQUEST_ENTITY_TOO_LARGE: 413,\n  REQUEST_URI_TOO_LONG: 414,\n  UNSUPPORTED_MEDIA_TYPE: 415,\n  REQUEST_RANGE_NOT_SATISFIABLE: 416,\n  EXPECTATION_FAILED: 417,\n  UNPROCESSABLE_ENTITY: 422,\n  LOCKED: 423,\n  FAILED_DEPENDENCY: 424,\n  PRECONDITION_REQUIRED: 428,\n  TOO_MANY_REQUESTS: 429,\n  REQUEST_HEADER_FIELDS_TOO_LARGE: 431,\n\n  // Server Error 5xx\n  INTERNAL_SERVER_ERROR: 500,\n  NOT_IMPLEMENTED: 501,\n  BAD_GATEWAY: 502,\n  SERVICE_UNAVAILABLE: 503,\n  GATEWAY_TIMEOUT: 504,\n  HTTP_VERSION_NOT_SUPPORTED: 505,\n  INSUFFICIENT_STORAGE: 507,\n  NETWORK_AUTHENTICATION_REQUIRED: 511,\n\n  /*\n   * IE returns this code for 204 due to its use of URLMon, which returns this\n   * code for 'Operation Aborted'. The status text is 'Unknown', the response\n   * headers are ''. Known to occur on IE 6 on XP through IE9 on Win7.\n   */\n  QUIRK_IE_NO_CONTENT: 1223,\n};\n\n\n/**\n * Returns whether the given status should be considered successful.\n *\n * Successful codes are OK (200), CREATED (201), ACCEPTED (202),\n * NO CONTENT (204), PARTIAL CONTENT (206), NOT MODIFIED (304),\n * and IE's no content code (1223).\n *\n * @param {number} status The status code to test.\n * @return {boolean} Whether the status code should be considered successful.\n */\ngoog.net.HttpStatus.isSuccess = function(status) {\n  switch (status) {\n    case goog.net.HttpStatus.OK:\n    case goog.net.HttpStatus.CREATED:\n    case goog.net.HttpStatus.ACCEPTED:\n    case goog.net.HttpStatus.NO_CONTENT:\n    case goog.net.HttpStatus.PARTIAL_CONTENT:\n    case goog.net.HttpStatus.NOT_MODIFIED:\n    case goog.net.HttpStatus.QUIRK_IE_NO_CONTENT:\n      return true;\n\n    default:\n      return false;\n  }\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Provides CORS support for HTTP based RPC requests.\n *\n * As part of net.rpc package, CORS features provided by this class\n * depend on the server support. Please check related specs to decide how\n * to enable any of the features provided by this class.\n */\n\ngoog.module('goog.net.rpc.HttpCors');\n\nvar GoogUri = goog.require('goog.Uri');\nvar googObject = goog.require('goog.object');\nvar googString = goog.require('goog.string');\nvar googUriUtils = goog.require('goog.uri.utils');\n\n\n/**\n * The default URL parameter name to overwrite http headers with a URL param\n * to avoid CORS preflight.\n *\n * See https://github.com/whatwg/fetch/issues/210#issue-129531743 for the spec.\n *\n * @type {string}\n */\nexports.HTTP_HEADERS_PARAM_NAME = '$httpHeaders';\n\n\n/**\n * The default URL parameter name to overwrite http method with a URL param\n * to avoid CORS preflight.\n *\n * See https://github.com/whatwg/fetch/issues/210#issue-129531743 for the spec.\n *\n * @type {string}\n */\nexports.HTTP_METHOD_PARAM_NAME = '$httpMethod';\n\n\n/**\n * Generates the URL parameter value with custom headers encoded as\n * HTTP/1.1 headers block.\n *\n * @param {!Object<string, string>} headers The custom headers.\n * @return {string} The URL param to overwrite custom HTTP headers.\n */\nexports.generateHttpHeadersOverwriteParam = function(headers) {\n  var result = '';\n  googObject.forEach(headers, function(value, key) {\n    result += key;\n    result += ':';\n    result += value;\n    result += '\\r\\n';\n  });\n  return result;\n};\n\n\n/**\n * Generates the URL-encoded URL parameter value with custom headers encoded as\n * HTTP/1.1 headers block.\n *\n * @param {!Object<string, string>} headers The custom headers.\n * @return {string} The URL param to overwrite custom HTTP headers.\n */\nexports.generateEncodedHttpHeadersOverwriteParam = function(headers) {\n  return googString.urlEncode(\n      exports.generateHttpHeadersOverwriteParam(headers));\n};\n\n\n/**\n * Sets custom HTTP headers via an overwrite URL param.\n *\n * @param {!GoogUri|string} url The URI object or a string path.\n * @param {string} urlParam The URL param name.\n * @param {!Object<string, string>} extraHeaders The HTTP headers.\n * @return {!GoogUri|string} The URI object or a string path with headers\n * encoded as a url param.\n */\nexports.setHttpHeadersWithOverwriteParam = function(\n    url, urlParam, extraHeaders) {\n  if (googObject.isEmpty(extraHeaders)) {\n    return url;\n  }\n  var httpHeaders = exports.generateHttpHeadersOverwriteParam(extraHeaders);\n  if (typeof url === 'string') {\n    return googUriUtils.appendParam(\n        url, googString.urlEncode(urlParam), httpHeaders);\n  } else {\n    url.setParameterValue(urlParam, httpHeaders);  // duplicate removed!\n    return url;\n  }\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Implementation of a WebChannel transport using WebChannelBase.\n *\n * When WebChannelBase is used as the underlying transport, the capabilities\n * of the WebChannel are limited to what's supported by the implementation.\n * Particularly, multiplexing is not possible, and only strings are\n * supported as message types.\n */\n\ngoog.provide('goog.labs.net.webChannel.WebChannelBaseTransport');\n\ngoog.require('goog.asserts');\ngoog.require('goog.events.EventTarget');\ngoog.require('goog.json');\ngoog.require('goog.labs.net.webChannel.ChannelRequest');\ngoog.require('goog.labs.net.webChannel.WebChannelBase');\ngoog.require('goog.labs.net.webChannel.Wire');\ngoog.require('goog.log');\ngoog.require('goog.net.WebChannel');\ngoog.require('goog.net.WebChannelTransport');\ngoog.require('goog.object');\ngoog.require('goog.string');\n\n\n\n/**\n * Implementation of {@link goog.net.WebChannelTransport} with\n * {@link goog.labs.net.webChannel.WebChannelBase} as the underlying channel\n * implementation.\n *\n * @constructor\n * @struct\n * @implements {goog.net.WebChannelTransport}\n * @final\n */\ngoog.labs.net.webChannel.WebChannelBaseTransport = function() {\n  if (!goog.labs.net.webChannel.ChannelRequest.supportsXhrStreaming()) {\n    throw new Error('Environmental error: no available transport.');\n  }\n};\n\n\ngoog.scope(function() {\nvar WebChannelBaseTransport = goog.labs.net.webChannel.WebChannelBaseTransport;\nvar WebChannelBase = goog.labs.net.webChannel.WebChannelBase;\nvar Wire = goog.labs.net.webChannel.Wire;\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.prototype.createWebChannel = function(\n    url, opt_options) {\n  return new WebChannelBaseTransport.Channel(url, opt_options);\n};\n\n\n\n/**\n * Implementation of the {@link goog.net.WebChannel} interface.\n *\n * @param {string} url The URL path for the new WebChannel instance.\n * @param {!goog.net.WebChannel.Options=} opt_options Configuration for the\n *     new WebChannel instance.\n *\n * @constructor\n * @implements {goog.net.WebChannel}\n * @extends {goog.events.EventTarget}\n * @final\n */\nWebChannelBaseTransport.Channel = function(url, opt_options) {\n  WebChannelBaseTransport.Channel.base(this, 'constructor');\n\n  /**\n   * @private {!WebChannelBase} The underlying channel object.\n   */\n  this.channel_ = new WebChannelBase(\n      opt_options, goog.net.WebChannelTransport.CLIENT_VERSION);\n\n  /**\n   * @private {string} The URL of the target server end-point.\n   */\n  this.url_ = url;\n\n  /**\n   * @private {goog.log.Logger} The logger for this class.\n   */\n  this.logger_ =\n      goog.log.getLogger('goog.labs.net.webChannel.WebChannelBaseTransport');\n\n  /**\n   * @private {Object<string, string>} Extra URL parameters\n   * to be added to each HTTP request.\n   */\n  this.messageUrlParams_ =\n      (opt_options && opt_options.messageUrlParams) || null;\n\n  var messageHeaders = (opt_options && opt_options.messageHeaders) || null;\n\n  // default is false\n  if (opt_options && opt_options.clientProtocolHeaderRequired) {\n    if (messageHeaders) {\n      goog.object.set(\n          messageHeaders, goog.net.WebChannel.X_CLIENT_PROTOCOL,\n          goog.net.WebChannel.X_CLIENT_PROTOCOL_WEB_CHANNEL);\n    } else {\n      messageHeaders = goog.object.create(\n          goog.net.WebChannel.X_CLIENT_PROTOCOL,\n          goog.net.WebChannel.X_CLIENT_PROTOCOL_WEB_CHANNEL);\n    }\n  }\n\n  this.channel_.setExtraHeaders(messageHeaders);\n\n  var initHeaders = (opt_options && opt_options.initMessageHeaders) || null;\n\n  if (opt_options && opt_options.messageContentType) {\n    if (initHeaders) {\n      goog.object.set(\n          initHeaders, goog.net.WebChannel.X_WEBCHANNEL_CONTENT_TYPE,\n          opt_options.messageContentType);\n    } else {\n      initHeaders = goog.object.create(\n          goog.net.WebChannel.X_WEBCHANNEL_CONTENT_TYPE,\n          opt_options.messageContentType);\n    }\n  }\n\n  if (opt_options && opt_options.clientProfile) {\n    if (initHeaders) {\n      goog.object.set(\n          initHeaders, goog.net.WebChannel.X_WEBCHANNEL_CLIENT_PROFILE,\n          opt_options.clientProfile);\n    } else {\n      initHeaders = goog.object.create(\n          goog.net.WebChannel.X_WEBCHANNEL_CLIENT_PROFILE,\n          opt_options.clientProfile);\n    }\n  }\n\n  this.channel_.setInitHeaders(initHeaders);\n\n  var httpHeadersOverwriteParam =\n      opt_options && opt_options.httpHeadersOverwriteParam;\n  if (httpHeadersOverwriteParam &&\n      !goog.string.isEmptyOrWhitespace(httpHeadersOverwriteParam)) {\n    this.channel_.setHttpHeadersOverwriteParam(httpHeadersOverwriteParam);\n  }\n\n  /**\n   * @private {boolean} Whether to enable CORS.\n   */\n  this.supportsCrossDomainXhr_ =\n      (opt_options && opt_options.supportsCrossDomainXhr) || false;\n\n  /**\n   * @private {boolean} Whether to send raw Json and bypass v8 wire format.\n   */\n  this.sendRawJson_ = (opt_options && opt_options.sendRawJson) || false;\n\n  // Note that httpSessionIdParam will be ignored if the same parameter name\n  // has already been specified with messageUrlParams\n  var httpSessionIdParam = opt_options && opt_options.httpSessionIdParam;\n  if (httpSessionIdParam &&\n      !goog.string.isEmptyOrWhitespace(httpSessionIdParam)) {\n    this.channel_.setHttpSessionIdParam(httpSessionIdParam);\n    if (goog.object.containsKey(this.messageUrlParams_, httpSessionIdParam)) {\n      goog.object.remove(this.messageUrlParams_, httpSessionIdParam);\n      goog.log.warning(this.logger_,\n          'Ignore httpSessionIdParam also specified with messageUrlParams: '\n          + httpSessionIdParam);\n    }\n  }\n\n  /**\n   * The channel handler.\n   *\n   * @private {!WebChannelBaseTransport.Channel.Handler_}\n   */\n  this.channelHandler_ = new WebChannelBaseTransport.Channel.Handler_(this);\n};\ngoog.inherits(WebChannelBaseTransport.Channel, goog.events.EventTarget);\n\n\n/**\n * @override\n * @suppress {checkTypes}\n */\nWebChannelBaseTransport.Channel.prototype.addEventListener = function(\n    type, handler, /** boolean= */ opt_capture, opt_handlerScope) {\n  WebChannelBaseTransport.Channel.base(\n      this, 'addEventListener', type, handler, opt_capture, opt_handlerScope);\n};\n\n\n/**\n * @override\n * @suppress {checkTypes}\n */\nWebChannelBaseTransport.Channel.prototype.removeEventListener = function(\n    type, handler, /** boolean= */ opt_capture, opt_handlerScope) {\n  WebChannelBaseTransport.Channel.base(\n      this, 'removeEventListener', type, handler, opt_capture,\n      opt_handlerScope);\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.prototype.open = function() {\n  this.channel_.setHandler(this.channelHandler_);\n  if (this.supportsCrossDomainXhr_) {\n    this.channel_.setSupportsCrossDomainXhrs(true);\n  }\n  this.channel_.connect(this.url_, (this.messageUrlParams_ || undefined));\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.prototype.close = function() {\n  this.channel_.disconnect();\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.prototype.halfClose = function() {\n  // to be implemented\n  throw new Error('Not implemented');\n};\n\n\n/**\n * The WebChannelBase only supports object types.\n *\n * @param {!goog.net.WebChannel.MessageData} message The message to send.\n *\n * @override\n */\nWebChannelBaseTransport.Channel.prototype.send = function(message) {\n  goog.asserts.assert(\n      goog.isObject(message) || typeof message === 'string',\n      'only object type or raw string is supported');\n\n  if (typeof message === 'string') {\n    var rawJson = {};\n    rawJson[Wire.RAW_DATA_KEY] = message;\n    this.channel_.sendMap(rawJson);\n  } else if (this.sendRawJson_) {\n    var rawJson = {};\n    rawJson[Wire.RAW_DATA_KEY] = goog.json.serialize(message);\n    this.channel_.sendMap(rawJson);\n  } else {\n    this.channel_.sendMap(message);\n  }\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.prototype.disposeInternal = function() {\n  this.channel_.setHandler(null);\n  delete this.channelHandler_;\n  this.channel_.disconnect();\n  delete this.channel_;\n\n  WebChannelBaseTransport.Channel.base(this, 'disposeInternal');\n};\n\n\n\n/**\n * The message event.\n *\n * @param {!Array<?>|!Object} array The data array from the underlying channel.\n * @constructor\n * @extends {goog.net.WebChannel.MessageEvent}\n * @final\n */\nWebChannelBaseTransport.Channel.MessageEvent = function(array) {\n  WebChannelBaseTransport.Channel.MessageEvent.base(this, 'constructor');\n\n  // single-metadata only\n  var metadata = array['__sm__'];\n  if (metadata) {\n    this.metadataKey = goog.object.getAnyKey(metadata);\n    if (this.metadataKey) {\n      this.data = goog.object.get(metadata, this.metadataKey);\n    } else {\n      this.data = metadata;  // empty\n    }\n  } else {\n    this.data = array;\n  }\n};\ngoog.inherits(\n    WebChannelBaseTransport.Channel.MessageEvent,\n    goog.net.WebChannel.MessageEvent);\n\n\n\n/**\n * The error event.\n *\n * @param {WebChannelBase.Error} error The error code.\n * @constructor\n * @extends {goog.net.WebChannel.ErrorEvent}\n * @final\n */\nWebChannelBaseTransport.Channel.ErrorEvent = function(error) {\n  WebChannelBaseTransport.Channel.ErrorEvent.base(this, 'constructor');\n\n  /**\n   * High-level status code.\n   */\n  this.status = goog.net.WebChannel.ErrorStatus.NETWORK_ERROR;\n\n  /**\n   * @const {WebChannelBase.Error} Internal error code, for debugging use only.\n   */\n  this.errorCode = error;\n};\ngoog.inherits(\n    WebChannelBaseTransport.Channel.ErrorEvent, goog.net.WebChannel.ErrorEvent);\n\n\n\n/**\n * Implementation of {@link WebChannelBase.Handler} interface.\n *\n * @param {!WebChannelBaseTransport.Channel} channel The enclosing WebChannel.\n *\n * @constructor\n * @extends {WebChannelBase.Handler}\n * @private\n */\nWebChannelBaseTransport.Channel.Handler_ = function(channel) {\n  WebChannelBaseTransport.Channel.Handler_.base(this, 'constructor');\n\n  /**\n   * @type {!WebChannelBaseTransport.Channel}\n   * @private\n   */\n  this.channel_ = channel;\n};\ngoog.inherits(WebChannelBaseTransport.Channel.Handler_, WebChannelBase.Handler);\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.Handler_.prototype.channelOpened = function(\n    channel) {\n  goog.log.info(\n      this.channel_.logger_, 'WebChannel opened on ' + this.channel_.url_);\n  this.channel_.dispatchEvent(goog.net.WebChannel.EventType.OPEN);\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.Handler_.prototype.channelHandleArray =\n    function(channel, array) {\n  goog.asserts.assert(array, 'array expected to be defined');\n  this.channel_.dispatchEvent(\n      new WebChannelBaseTransport.Channel.MessageEvent(array));\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.Handler_.prototype.channelError = function(\n    channel, error) {\n  goog.log.info(\n      this.channel_.logger_, 'WebChannel aborted on ' + this.channel_.url_ +\n          ' due to channel error: ' + error);\n  this.channel_.dispatchEvent(\n      new WebChannelBaseTransport.Channel.ErrorEvent(error));\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.Handler_.prototype.channelClosed = function(\n    channel, opt_pendingMaps, opt_undeliveredMaps) {\n  goog.log.info(\n      this.channel_.logger_, 'WebChannel closed on ' + this.channel_.url_);\n  this.channel_.dispatchEvent(goog.net.WebChannel.EventType.CLOSE);\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.Channel.prototype.getRuntimeProperties = function() {\n  return new WebChannelBaseTransport.ChannelProperties(this.channel_);\n};\n\n\n\n/**\n * Implementation of the {@link goog.net.WebChannel.RuntimeProperties}.\n *\n * @param {!WebChannelBase} channel The underlying channel object.\n *\n * @constructor\n * @implements {goog.net.WebChannel.RuntimeProperties}\n * @final\n */\nWebChannelBaseTransport.ChannelProperties = function(channel) {\n  /**\n   * The underlying channel object.\n   *\n   * @private {!WebChannelBase}\n   */\n  this.channel_ = channel;\n\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.getConcurrentRequestLimit =\n    function() {\n  return this.channel_.getForwardChannelRequestPool().getMaxSize();\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.isSpdyEnabled = function() {\n  return this.getConcurrentRequestLimit() > 1;\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.getPendingRequestCount =\n    function() {\n  return this.channel_.getForwardChannelRequestPool().getRequestCount();\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.getHttpSessionId =\n    function() {\n  return this.channel_.getHttpSessionId();\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.commit = function(\n    callback) {\n  this.channel_.setForwardChannelFlushCallback(callback);\n};\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.getNonAckedMessageCount =\n    goog.abstractMethod;\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.notifyNonAckedMessageCount =\n    goog.abstractMethod;\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.onCommit =\n    goog.abstractMethod;\n\n\n/**\n * @override\n */\nWebChannelBaseTransport.ChannelProperties.prototype.ackCommit =\n    goog.abstractMethod;\n\n\n/** @override */\nWebChannelBaseTransport.ChannelProperties.prototype.getLastStatusCode =\n    function() {\n  return this.channel_.getLastStatusCode();\n};\n});  // goog.scope\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Transport support for WebChannel.\n *\n * The <code>WebChannelTransport</code> implementation serves as the factory\n * for <code>WebChannel</code>, which offers an abstraction for\n * point-to-point socket-like communication similar to what BrowserChannel\n * or HTML5 WebSocket offers.\n */\n\ngoog.provide('goog.net.WebChannelTransport');\n\ngoog.forwardDeclare('goog.net.WebChannel.Options');\ngoog.requireType('goog.net.WebChannel');\n\n\n\n/**\n * A WebChannelTransport instance represents a shared context of logical\n * connectivity between a browser client and a remote origin.\n *\n * Over a single WebChannelTransport instance, multiple WebChannels may be\n * created against different URLs, which may all share the same\n * underlying connectivity (i.e. TCP connection) whenever possible.\n *\n * When multi-domains are supported, such as CORS, multiple origins may be\n * supported over a single WebChannelTransport instance at the same time.\n *\n * Sharing between different window contexts such as tabs is not addressed\n * by WebChannelTransport. Applications may choose HTML5 shared workers\n * or other techniques to access the same transport instance\n * across different window contexts.\n *\n * @interface\n */\ngoog.net.WebChannelTransport = function() {};\n\n\n/**\n * The client version. This integer value will be passed to the server\n * when a channel is opened to inform the server the client \"capabilities\".\n *\n * Wire protocol version is a different concept and is internal to the\n * transport implementation.\n *\n * @const\n * @type {number}\n */\ngoog.net.WebChannelTransport.CLIENT_VERSION = 22;\n\n\n/**\n * Create a new WebChannel instance.\n *\n * The new WebChannel is to be opened against the server-side resource\n * as specified by the given URL. See {@link goog.net.WebChannel} for detailed\n * semantics.\n *\n * @param {string} url The URL path for the new WebChannel instance.\n * @param {!goog.net.WebChannel.Options=} opt_options Configuration for the\n *     new WebChannel instance. The configuration object is reusable after\n *     the new channel instance is created.\n * @return {!goog.net.WebChannel} the newly created WebChannel instance.\n */\ngoog.net.WebChannelTransport.prototype.createWebChannel = goog.abstractMethod;\n","/**\n * @license\n * Copyright 2017 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * Bring in closure-library dependencies\n */\n\ngoog.provide('firebase.webchannel.wrapper');\n\n// goog.net.WebChannelTransport\ngoog.require('goog.net.createWebChannelTransport');\ngoog.require('goog.labs.net.webChannel.WebChannelBaseTransport');\n/**\n * NOTE: The `createWebChannel` function takes an options object as a second param\n * whose properties are typically mangled. We override these in externs/overrides.js\n * Without those externs, this does not function properly.\n */\ngoog.labs.net.webChannel.WebChannelBaseTransport.prototype['createWebChannel'] =\n  goog.labs.net.webChannel.WebChannelBaseTransport.prototype.createWebChannel;\ngoog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype['send'] =\n  goog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype.send;\ngoog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype['open'] =\n  goog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype.open;\ngoog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype['close'] =\n  goog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype.close;\n\n// goog.net.ErrorCode\ngoog.require('goog.net.ErrorCode');\ngoog.net.ErrorCode['NO_ERROR'] = goog.net.ErrorCode.NO_ERROR;\ngoog.net.ErrorCode['TIMEOUT'] = goog.net.ErrorCode.TIMEOUT;\ngoog.net.ErrorCode['HTTP_ERROR'] = goog.net.ErrorCode.HTTP_ERROR;\n\n// goog.net.ErrorType\ngoog.require('goog.net.EventType');\ngoog.net.EventType['COMPLETE'] = goog.net.EventType.COMPLETE;\n\n// goog.net.WebChannel\ngoog.require('goog.net.WebChannel');\ngoog.require('goog.events.EventTarget');\ngoog.net.WebChannel['EventType'] = goog.net.WebChannel.EventType;\ngoog.net.WebChannel.EventType['OPEN'] = goog.net.WebChannel.EventType.OPEN;\ngoog.net.WebChannel.EventType['CLOSE'] = goog.net.WebChannel.EventType.CLOSE;\ngoog.net.WebChannel.EventType['ERROR'] = goog.net.WebChannel.EventType.ERROR;\ngoog.net.WebChannel.EventType['MESSAGE'] =\n  goog.net.WebChannel.EventType.MESSAGE;\ngoog.events.EventTarget.prototype['listen'] =\n  goog.events.EventTarget.prototype.listen;\n\n// goog.net.XhrIo\ngoog.require('goog.net.XhrIo');\ngoog.net.XhrIo.prototype['listenOnce'] = goog.net.XhrIo.prototype.listenOnce;\ngoog.net.XhrIo.prototype['getLastError'] =\n  goog.net.XhrIo.prototype.getLastError;\ngoog.net.XhrIo.prototype['getLastErrorCode'] =\n  goog.net.XhrIo.prototype.getLastErrorCode;\ngoog.net.XhrIo.prototype['getStatus'] = goog.net.XhrIo.prototype.getStatus;\ngoog.net.XhrIo.prototype['getResponseJson'] =\n  goog.net.XhrIo.prototype.getResponseJson;\ngoog.net.XhrIo.prototype['getResponseText'] =\n  goog.net.XhrIo.prototype.getResponseText;\ngoog.net.XhrIo.prototype['send'] = goog.net.XhrIo.prototype.send;\n\n/**\n * This ignore statement is required as closure will minify these properties\n * if done in the typical prettier format\n */\n// prettier-ignore\nmodule['exports'] = {\n  'createWebChannelTransport': goog.net.createWebChannelTransport,\n  'ErrorCode': goog.net.ErrorCode,\n  'EventType': goog.net.EventType,\n  'WebChannel': goog.net.WebChannel,\n  'XhrIo': goog.net.XhrIo\n};\n","/**\n * @license\n * Copyright The Closure Library Authors.\n * SPDX-License-Identifier: Apache-2.0\n */\n\n/**\n * @fileoverview Default factory for <code>WebChannelTransport</code> to\n * avoid exposing concrete classes to clients.\n */\n\ngoog.provide('goog.net.createWebChannelTransport');\n\ngoog.require('goog.labs.net.webChannel.WebChannelBaseTransport');\n\n\n/**\n * Create a new WebChannelTransport instance using the default implementation.\n * Throws an error message if no default transport available in the current\n * environment.\n *\n * @return {!goog.net.WebChannelTransport} the newly created transport instance.\n */\ngoog.net.createWebChannelTransport = function() {\n  return new goog.labs.net.webChannel.WebChannelBaseTransport();\n};\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport firebase from '@firebase/app';\n\n/** The semver (www.semver.org) version of the SDK. */\nexport const SDK_VERSION = firebase.SDK_VERSION;\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * Simple wrapper around a nullable UID. Mostly exists to make code more\n * readable.\n */\nexport class User {\n  /** A user with a null UID. */\n  static readonly UNAUTHENTICATED = new User(null);\n\n  // TODO(mikelehen): Look into getting a proper uid-equivalent for\n  // non-FirebaseAuth providers.\n  static readonly GOOGLE_CREDENTIALS = new User('google-credentials-uid');\n  static readonly FIRST_PARTY = new User('first-party-uid');\n\n  constructor(readonly uid: string | null) {}\n\n  isAuthenticated(): boolean {\n    return this.uid != null;\n  }\n\n  /**\n   * Returns a key representing this user, suitable for inclusion in a\n   * dictionary.\n   */\n  toKey(): string {\n    if (this.isAuthenticated()) {\n      return 'uid:' + this.uid;\n    } else {\n      return 'anonymous-user';\n    }\n  }\n\n  isEqual(otherUser: User): boolean {\n    return otherUser.uid === this.uid;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { User } from '../auth/user';\nimport { hardAssert, debugAssert } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport {\n  FirebaseAuthInternal,\n  FirebaseAuthInternalName\n} from '@firebase/auth-interop-types';\nimport { Provider } from '@firebase/component';\n\n// TODO(mikelehen): This should be split into multiple files and probably\n// moved to an auth/ folder to match other platforms.\n\nexport interface FirstPartyCredentialsSettings {\n  type: 'gapi';\n  client: unknown;\n  sessionIndex: string;\n}\n\nexport interface ProviderCredentialsSettings {\n  type: 'provider';\n  client: CredentialsProvider;\n}\n\n/** Settings for private credentials */\nexport type CredentialsSettings =\n  | FirstPartyCredentialsSettings\n  | ProviderCredentialsSettings;\n\nexport type TokenType = 'OAuth' | 'FirstParty';\nexport interface Token {\n  /** Type of token. */\n  type: TokenType;\n\n  /**\n   * The user with which the token is associated (used for persisting user\n   * state on disk, etc.).\n   */\n  user: User;\n\n  /** Extra header values to be passed along with a request */\n  authHeaders: { [header: string]: string };\n}\n\nexport class OAuthToken implements Token {\n  type = 'OAuth' as TokenType;\n  authHeaders: { [header: string]: string };\n  constructor(value: string, public user: User) {\n    this.authHeaders = {};\n    // Set the headers using Object Literal notation to avoid minification\n    this.authHeaders['Authorization'] = `Bearer ${value}`;\n  }\n}\n\n/**\n * A Listener for credential change events. The listener should fetch a new\n * token and may need to invalidate other state if the current user has also\n * changed.\n */\nexport type CredentialChangeListener = (user: User) => void;\n\n/**\n * Provides methods for getting the uid and token for the current user and\n * listening for changes.\n */\nexport interface CredentialsProvider {\n  /** Requests a token for the current user. */\n  getToken(): Promise<Token | null>;\n\n  /**\n   * Marks the last retrieved token as invalid, making the next GetToken request\n   * force-refresh the token.\n   */\n  invalidateToken(): void;\n\n  /**\n   * Specifies a listener to be notified of credential changes\n   * (sign-in / sign-out, token changes). It is immediately called once with the\n   * initial user.\n   */\n  setChangeListener(changeListener: CredentialChangeListener): void;\n\n  /** Removes the previously-set change listener. */\n  removeChangeListener(): void;\n}\n\n/** A CredentialsProvider that always yields an empty token. */\nexport class EmptyCredentialsProvider implements CredentialsProvider {\n  /**\n   * Stores the listener registered with setChangeListener()\n   * This isn't actually necessary since the UID never changes, but we use this\n   * to verify the listen contract is adhered to in tests.\n   */\n  private changeListener: CredentialChangeListener | null = null;\n\n  getToken(): Promise<Token | null> {\n    return Promise.resolve<Token | null>(null);\n  }\n\n  invalidateToken(): void {}\n\n  setChangeListener(changeListener: CredentialChangeListener): void {\n    debugAssert(\n      !this.changeListener,\n      'Can only call setChangeListener() once.'\n    );\n    this.changeListener = changeListener;\n    // Fire with initial user.\n    changeListener(User.UNAUTHENTICATED);\n  }\n\n  removeChangeListener(): void {\n    debugAssert(\n      this.changeListener !== null,\n      'removeChangeListener() when no listener registered'\n    );\n    this.changeListener = null;\n  }\n}\n\nexport class FirebaseCredentialsProvider implements CredentialsProvider {\n  /**\n   * The auth token listener registered with FirebaseApp, retained here so we\n   * can unregister it.\n   */\n  private tokenListener: ((token: string | null) => void) | null = null;\n\n  /** Tracks the current User. */\n  private currentUser: User = User.UNAUTHENTICATED;\n  private receivedInitialUser: boolean = false;\n\n  /**\n   * Counter used to detect if the token changed while a getToken request was\n   * outstanding.\n   */\n  private tokenCounter = 0;\n\n  /** The listener registered with setChangeListener(). */\n  private changeListener: CredentialChangeListener | null = null;\n\n  private forceRefresh = false;\n\n  private auth: FirebaseAuthInternal | null;\n\n  constructor(authProvider: Provider<FirebaseAuthInternalName>) {\n    this.tokenListener = () => {\n      this.tokenCounter++;\n      this.currentUser = this.getUser();\n      this.receivedInitialUser = true;\n      if (this.changeListener) {\n        this.changeListener(this.currentUser);\n      }\n    };\n\n    this.tokenCounter = 0;\n\n    this.auth = authProvider.getImmediate({ optional: true });\n\n    if (this.auth) {\n      this.auth.addAuthTokenListener(this.tokenListener!);\n    } else {\n      // if auth is not available, invoke tokenListener once with null token\n      this.tokenListener(null);\n      authProvider.get().then(\n        auth => {\n          this.auth = auth;\n          if (this.tokenListener) {\n            // tokenListener can be removed by removeChangeListener()\n            this.auth.addAuthTokenListener(this.tokenListener);\n          }\n        },\n        () => {\n          /* this.authProvider.get() never rejects */\n        }\n      );\n    }\n  }\n\n  getToken(): Promise<Token | null> {\n    debugAssert(\n      this.tokenListener != null,\n      'getToken cannot be called after listener removed.'\n    );\n\n    // Take note of the current value of the tokenCounter so that this method\n    // can fail (with an ABORTED error) if there is a token change while the\n    // request is outstanding.\n    const initialTokenCounter = this.tokenCounter;\n    const forceRefresh = this.forceRefresh;\n    this.forceRefresh = false;\n\n    if (!this.auth) {\n      return Promise.resolve(null);\n    }\n\n    return this.auth.getToken(forceRefresh).then(tokenData => {\n      // Cancel the request since the token changed while the request was\n      // outstanding so the response is potentially for a previous user (which\n      // user, we can't be sure).\n      if (this.tokenCounter !== initialTokenCounter) {\n        throw new FirestoreError(\n          Code.ABORTED,\n          'getToken aborted due to token change.'\n        );\n      } else {\n        if (tokenData) {\n          hardAssert(\n            typeof tokenData.accessToken === 'string',\n            'Invalid tokenData returned from getToken():' + tokenData\n          );\n          return new OAuthToken(tokenData.accessToken, this.currentUser);\n        } else {\n          return null;\n        }\n      }\n    });\n  }\n\n  invalidateToken(): void {\n    this.forceRefresh = true;\n  }\n\n  setChangeListener(changeListener: CredentialChangeListener): void {\n    debugAssert(\n      !this.changeListener,\n      'Can only call setChangeListener() once.'\n    );\n    this.changeListener = changeListener;\n\n    // Fire the initial event\n    if (this.receivedInitialUser) {\n      changeListener(this.currentUser);\n    }\n  }\n\n  removeChangeListener(): void {\n    debugAssert(\n      this.tokenListener != null,\n      'removeChangeListener() called twice'\n    );\n    debugAssert(\n      this.changeListener !== null,\n      'removeChangeListener() called when no listener registered'\n    );\n\n    if (this.auth) {\n      this.auth.removeAuthTokenListener(this.tokenListener!);\n    }\n    this.tokenListener = null;\n    this.changeListener = null;\n  }\n\n  // Auth.getUid() can return null even with a user logged in. It is because\n  // getUid() is synchronous, but the auth code populating Uid is asynchronous.\n  // This method should only be called in the AuthTokenListener callback\n  // to guarantee to get the actual user.\n  private getUser(): User {\n    const currentUid = this.auth && this.auth.getUid();\n    hardAssert(\n      currentUid === null || typeof currentUid === 'string',\n      'Received invalid UID: ' + currentUid\n    );\n    return new User(currentUid);\n  }\n}\n\n// Manual type definition for the subset of Gapi we use.\ninterface Gapi {\n  auth: {\n    getAuthHeaderValueForFirstParty: (\n      userIdentifiers: Array<{ [key: string]: string }>\n    ) => string | null;\n  };\n}\n\n/*\n * FirstPartyToken provides a fresh token each time its value\n * is requested, because if the token is too old, requests will be rejected.\n * Technically this may no longer be necessary since the SDK should gracefully\n * recover from unauthenticated errors (see b/33147818 for context), but it's\n * safer to keep the implementation as-is.\n */\nexport class FirstPartyToken implements Token {\n  type = 'FirstParty' as TokenType;\n  user = User.FIRST_PARTY;\n\n  constructor(private gapi: Gapi, private sessionIndex: string) {}\n\n  get authHeaders(): { [header: string]: string } {\n    const headers: { [header: string]: string } = {\n      'X-Goog-AuthUser': this.sessionIndex\n    };\n    const authHeader = this.gapi.auth.getAuthHeaderValueForFirstParty([]);\n    if (authHeader) {\n      headers['Authorization'] = authHeader;\n    }\n    return headers;\n  }\n}\n\n/*\n * Provides user credentials required for the Firestore JavaScript SDK\n * to authenticate the user, using technique that is only available\n * to applications hosted by Google.\n */\nexport class FirstPartyCredentialsProvider implements CredentialsProvider {\n  constructor(private gapi: Gapi, private sessionIndex: string) {}\n\n  getToken(): Promise<Token | null> {\n    return Promise.resolve(new FirstPartyToken(this.gapi, this.sessionIndex));\n  }\n\n  setChangeListener(changeListener: CredentialChangeListener): void {\n    // Fire with initial uid.\n    changeListener(User.FIRST_PARTY);\n  }\n\n  removeChangeListener(): void {}\n\n  invalidateToken(): void {}\n}\n\n/**\n * Builds a CredentialsProvider depending on the type of\n * the credentials passed in.\n */\nexport function makeCredentialsProvider(\n  credentials?: CredentialsSettings\n): CredentialsProvider {\n  if (!credentials) {\n    return new EmptyCredentialsProvider();\n  }\n\n  switch (credentials.type) {\n    case 'gapi':\n      const client = credentials.client as Gapi;\n      // Make sure this really is a Gapi client.\n      hardAssert(\n        !!(\n          typeof client === 'object' &&\n          client !== null &&\n          client['auth'] &&\n          client['auth']['getAuthHeaderValueForFirstParty']\n        ),\n        'unexpected gapi interface'\n      );\n      return new FirstPartyCredentialsProvider(\n        client,\n        credentials.sessionIndex || '0'\n      );\n\n    case 'provider':\n      return credentials.client;\n\n    default:\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'makeCredentialsProvider failed due to invalid credential type'\n      );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as firestore from '@firebase/firestore-types';\n\n/**\n * Error Codes describing the different ways Firestore can fail. These come\n * directly from GRPC.\n */\nexport type Code = firestore.FirestoreErrorCode;\n\nexport const Code = {\n  // Causes are copied from:\n  // https://github.com/grpc/grpc/blob/bceec94ea4fc5f0085d81235d8e1c06798dc341a/include/grpc%2B%2B/impl/codegen/status_code_enum.h\n  /** Not an error; returned on success. */\n  OK: 'ok' as Code,\n\n  /** The operation was cancelled (typically by the caller). */\n  CANCELLED: 'cancelled' as Code,\n\n  /** Unknown error or an error from a different error domain. */\n  UNKNOWN: 'unknown' as Code,\n\n  /**\n   * Client specified an invalid argument. Note that this differs from\n   * FAILED_PRECONDITION. INVALID_ARGUMENT indicates arguments that are\n   * problematic regardless of the state of the system (e.g., a malformed file\n   * name).\n   */\n  INVALID_ARGUMENT: 'invalid-argument' as Code,\n\n  /**\n   * Deadline expired before operation could complete. For operations that\n   * change the state of the system, this error may be returned even if the\n   * operation has completed successfully. For example, a successful response\n   * from a server could have been delayed long enough for the deadline to\n   * expire.\n   */\n  DEADLINE_EXCEEDED: 'deadline-exceeded' as Code,\n\n  /** Some requested entity (e.g., file or directory) was not found. */\n  NOT_FOUND: 'not-found' as Code,\n\n  /**\n   * Some entity that we attempted to create (e.g., file or directory) already\n   * exists.\n   */\n  ALREADY_EXISTS: 'already-exists' as Code,\n\n  /**\n   * The caller does not have permission to execute the specified operation.\n   * PERMISSION_DENIED must not be used for rejections caused by exhausting\n   * some resource (use RESOURCE_EXHAUSTED instead for those errors).\n   * PERMISSION_DENIED must not be used if the caller can not be identified\n   * (use UNAUTHENTICATED instead for those errors).\n   */\n  PERMISSION_DENIED: 'permission-denied' as Code,\n\n  /**\n   * The request does not have valid authentication credentials for the\n   * operation.\n   */\n  UNAUTHENTICATED: 'unauthenticated' as Code,\n\n  /**\n   * Some resource has been exhausted, perhaps a per-user quota, or perhaps the\n   * entire file system is out of space.\n   */\n  RESOURCE_EXHAUSTED: 'resource-exhausted' as Code,\n\n  /**\n   * Operation was rejected because the system is not in a state required for\n   * the operation's execution. For example, directory to be deleted may be\n   * non-empty, an rmdir operation is applied to a non-directory, etc.\n   *\n   * A litmus test that may help a service implementor in deciding\n   * between FAILED_PRECONDITION, ABORTED, and UNAVAILABLE:\n   *  (a) Use UNAVAILABLE if the client can retry just the failing call.\n   *  (b) Use ABORTED if the client should retry at a higher-level\n   *      (e.g., restarting a read-modify-write sequence).\n   *  (c) Use FAILED_PRECONDITION if the client should not retry until\n   *      the system state has been explicitly fixed. E.g., if an \"rmdir\"\n   *      fails because the directory is non-empty, FAILED_PRECONDITION\n   *      should be returned since the client should not retry unless\n   *      they have first fixed up the directory by deleting files from it.\n   *  (d) Use FAILED_PRECONDITION if the client performs conditional\n   *      REST Get/Update/Delete on a resource and the resource on the\n   *      server does not match the condition. E.g., conflicting\n   *      read-modify-write on the same resource.\n   */\n  FAILED_PRECONDITION: 'failed-precondition' as Code,\n\n  /**\n   * The operation was aborted, typically due to a concurrency issue like\n   * sequencer check failures, transaction aborts, etc.\n   *\n   * See litmus test above for deciding between FAILED_PRECONDITION, ABORTED,\n   * and UNAVAILABLE.\n   */\n  ABORTED: 'aborted' as Code,\n\n  /**\n   * Operation was attempted past the valid range. E.g., seeking or reading\n   * past end of file.\n   *\n   * Unlike INVALID_ARGUMENT, this error indicates a problem that may be fixed\n   * if the system state changes. For example, a 32-bit file system will\n   * generate INVALID_ARGUMENT if asked to read at an offset that is not in the\n   * range [0,2^32-1], but it will generate OUT_OF_RANGE if asked to read from\n   * an offset past the current file size.\n   *\n   * There is a fair bit of overlap between FAILED_PRECONDITION and\n   * OUT_OF_RANGE. We recommend using OUT_OF_RANGE (the more specific error)\n   * when it applies so that callers who are iterating through a space can\n   * easily look for an OUT_OF_RANGE error to detect when they are done.\n   */\n  OUT_OF_RANGE: 'out-of-range' as Code,\n\n  /** Operation is not implemented or not supported/enabled in this service. */\n  UNIMPLEMENTED: 'unimplemented' as Code,\n\n  /**\n   * Internal errors. Means some invariants expected by underlying System has\n   * been broken. If you see one of these errors, Something is very broken.\n   */\n  INTERNAL: 'internal' as Code,\n\n  /**\n   * The service is currently unavailable. This is a most likely a transient\n   * condition and may be corrected by retrying with a backoff.\n   *\n   * See litmus test above for deciding between FAILED_PRECONDITION, ABORTED,\n   * and UNAVAILABLE.\n   */\n  UNAVAILABLE: 'unavailable' as Code,\n\n  /** Unrecoverable data loss or corruption. */\n  DATA_LOSS: 'data-loss' as Code\n};\n\n/**\n * An error class used for Firestore-generated errors. Ideally we should be\n * using FirebaseError, but integrating with it is overly arduous at the moment,\n * so we define our own compatible error class (with a `name` of 'FirebaseError'\n * and compatible `code` and `message` fields.)\n */\nexport class FirestoreError extends Error implements firestore.FirestoreError {\n  name = 'FirebaseError';\n  stack?: string;\n\n  constructor(readonly code: Code, readonly message: string) {\n    super(message);\n\n    // HACK: We write a toString property directly because Error is not a real\n    // class and so inheritance does not work correctly. We could alternatively\n    // do the same \"back-door inheritance\" trick that FirebaseError does.\n    this.toString = () => `${this.name}: [code=${this.code}]: ${this.message}`;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Code, FirestoreError } from '../util/error';\nimport { primitiveComparator } from '../util/misc';\n\n// The earlist date supported by Firestore timestamps (0001-01-01T00:00:00Z).\nconst MIN_SECONDS = -62135596800;\n\nexport class Timestamp {\n  static now(): Timestamp {\n    return Timestamp.fromMillis(Date.now());\n  }\n\n  static fromDate(date: Date): Timestamp {\n    return Timestamp.fromMillis(date.getTime());\n  }\n\n  static fromMillis(milliseconds: number): Timestamp {\n    const seconds = Math.floor(milliseconds / 1000);\n    const nanos = (milliseconds - seconds * 1000) * 1e6;\n    return new Timestamp(seconds, nanos);\n  }\n\n  constructor(readonly seconds: number, readonly nanoseconds: number) {\n    if (nanoseconds < 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Timestamp nanoseconds out of range: ' + nanoseconds\n      );\n    }\n    if (nanoseconds >= 1e9) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Timestamp nanoseconds out of range: ' + nanoseconds\n      );\n    }\n    if (seconds < MIN_SECONDS) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Timestamp seconds out of range: ' + seconds\n      );\n    }\n    // This will break in the year 10,000.\n    if (seconds >= 253402300800) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Timestamp seconds out of range: ' + seconds\n      );\n    }\n  }\n\n  toDate(): Date {\n    return new Date(this.toMillis());\n  }\n\n  toMillis(): number {\n    return this.seconds * 1000 + this.nanoseconds / 1e6;\n  }\n\n  _compareTo(other: Timestamp): number {\n    if (this.seconds === other.seconds) {\n      return primitiveComparator(this.nanoseconds, other.nanoseconds);\n    }\n    return primitiveComparator(this.seconds, other.seconds);\n  }\n\n  isEqual(other: Timestamp): boolean {\n    return (\n      other.seconds === this.seconds && other.nanoseconds === this.nanoseconds\n    );\n  }\n\n  toString(): string {\n    return (\n      'Timestamp(seconds=' +\n      this.seconds +\n      ', nanoseconds=' +\n      this.nanoseconds +\n      ')'\n    );\n  }\n\n  valueOf(): string {\n    // This method returns a string of the form <seconds>.<nanoseconds> where <seconds> is\n    // translated to have a non-negative value and both <seconds> and <nanoseconds> are left-padded\n    // with zeroes to be a consistent length. Strings with this format then have a lexiographical\n    // ordering that matches the expected ordering. The <seconds> translation is done to avoid\n    // having a leading negative sign (i.e. a leading '-' character) in its string representation,\n    // which would affect its lexiographical ordering.\n    const adjustedSeconds = this.seconds - MIN_SECONDS;\n    // Note: Up to 12 decimal digits are required to represent all valid 'seconds' values.\n    const formattedSeconds = String(adjustedSeconds).padStart(12, '0');\n    const formattedNanoseconds = String(this.nanoseconds).padStart(9, '0');\n    return formattedSeconds + '.' + formattedNanoseconds;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Timestamp } from '../api/timestamp';\n\n/**\n * A version of a document in Firestore. This corresponds to the version\n * timestamp, such as update_time or read_time.\n */\nexport class SnapshotVersion {\n  static fromTimestamp(value: Timestamp): SnapshotVersion {\n    return new SnapshotVersion(value);\n  }\n\n  static min(): SnapshotVersion {\n    return new SnapshotVersion(new Timestamp(0, 0));\n  }\n\n  private constructor(private timestamp: Timestamp) {}\n\n  compareTo(other: SnapshotVersion): number {\n    return this.timestamp._compareTo(other.timestamp);\n  }\n\n  isEqual(other: SnapshotVersion): boolean {\n    return this.timestamp.isEqual(other.timestamp);\n  }\n\n  /** Returns a number representation of the version for use in spec tests. */\n  toMicroseconds(): number {\n    // Convert to microseconds.\n    return this.timestamp.seconds * 1e6 + this.timestamp.nanoseconds / 1000;\n  }\n\n  toString(): string {\n    return 'SnapshotVersion(' + this.timestamp.toString() + ')';\n  }\n\n  toTimestamp(): Timestamp {\n    return this.timestamp;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert, fail } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\n\nexport const DOCUMENT_KEY_NAME = '__name__';\n\n/**\n * Path represents an ordered sequence of string segments.\n */\nabstract class BasePath<B extends BasePath<B>> {\n  private segments: string[];\n  private offset: number;\n  private len: number;\n\n  constructor(segments: string[], offset?: number, length?: number) {\n    if (offset === undefined) {\n      offset = 0;\n    } else if (offset > segments.length) {\n      fail('offset ' + offset + ' out of range ' + segments.length);\n    }\n\n    if (length === undefined) {\n      length = segments.length - offset;\n    } else if (length > segments.length - offset) {\n      fail('length ' + length + ' out of range ' + (segments.length - offset));\n    }\n    this.segments = segments;\n    this.offset = offset;\n    this.len = length;\n  }\n\n  /**\n   * Abstract constructor method to construct an instance of B with the given\n   * parameters.\n   */\n  protected abstract construct(\n    segments: string[],\n    offset?: number,\n    length?: number\n  ): B;\n\n  /**\n   * Returns a String representation.\n   *\n   * Implementing classes are required to provide deterministic implementations as\n   * the String representation is used to obtain canonical Query IDs.\n   */\n  abstract toString(): string;\n\n  get length(): number {\n    return this.len;\n  }\n\n  isEqual(other: B): boolean {\n    return BasePath.comparator(this, other) === 0;\n  }\n\n  child(nameOrPath: string | B): B {\n    const segments = this.segments.slice(this.offset, this.limit());\n    if (nameOrPath instanceof BasePath) {\n      nameOrPath.forEach(segment => {\n        segments.push(segment);\n      });\n    } else {\n      segments.push(nameOrPath);\n    }\n    return this.construct(segments);\n  }\n\n  /** The index of one past the last segment of the path. */\n  private limit(): number {\n    return this.offset + this.length;\n  }\n\n  popFirst(size?: number): B {\n    size = size === undefined ? 1 : size;\n    debugAssert(\n      this.length >= size,\n      \"Can't call popFirst() with less segments\"\n    );\n    return this.construct(\n      this.segments,\n      this.offset + size,\n      this.length - size\n    );\n  }\n\n  popLast(): B {\n    debugAssert(!this.isEmpty(), \"Can't call popLast() on empty path\");\n    return this.construct(this.segments, this.offset, this.length - 1);\n  }\n\n  firstSegment(): string {\n    debugAssert(!this.isEmpty(), \"Can't call firstSegment() on empty path\");\n    return this.segments[this.offset];\n  }\n\n  lastSegment(): string {\n    return this.get(this.length - 1);\n  }\n\n  get(index: number): string {\n    debugAssert(index < this.length, 'Index out of range');\n    return this.segments[this.offset + index];\n  }\n\n  isEmpty(): boolean {\n    return this.length === 0;\n  }\n\n  isPrefixOf(other: this): boolean {\n    if (other.length < this.length) {\n      return false;\n    }\n\n    for (let i = 0; i < this.length; i++) {\n      if (this.get(i) !== other.get(i)) {\n        return false;\n      }\n    }\n\n    return true;\n  }\n\n  isImmediateParentOf(potentialChild: this): boolean {\n    if (this.length + 1 !== potentialChild.length) {\n      return false;\n    }\n\n    for (let i = 0; i < this.length; i++) {\n      if (this.get(i) !== potentialChild.get(i)) {\n        return false;\n      }\n    }\n\n    return true;\n  }\n\n  forEach(fn: (segment: string) => void): void {\n    for (let i = this.offset, end = this.limit(); i < end; i++) {\n      fn(this.segments[i]);\n    }\n  }\n\n  toArray(): string[] {\n    return this.segments.slice(this.offset, this.limit());\n  }\n\n  static comparator<T extends BasePath<T>>(\n    p1: BasePath<T>,\n    p2: BasePath<T>\n  ): number {\n    const len = Math.min(p1.length, p2.length);\n    for (let i = 0; i < len; i++) {\n      const left = p1.get(i);\n      const right = p2.get(i);\n      if (left < right) {\n        return -1;\n      }\n      if (left > right) {\n        return 1;\n      }\n    }\n    if (p1.length < p2.length) {\n      return -1;\n    }\n    if (p1.length > p2.length) {\n      return 1;\n    }\n    return 0;\n  }\n}\n\n/**\n * A slash-separated path for navigating resources (documents and collections)\n * within Firestore.\n */\nexport class ResourcePath extends BasePath<ResourcePath> {\n  protected construct(\n    segments: string[],\n    offset?: number,\n    length?: number\n  ): ResourcePath {\n    return new ResourcePath(segments, offset, length);\n  }\n\n  canonicalString(): string {\n    // NOTE: The client is ignorant of any path segments containing escape\n    // sequences (e.g. __id123__) and just passes them through raw (they exist\n    // for legacy reasons and should not be used frequently).\n\n    return this.toArray().join('/');\n  }\n\n  toString(): string {\n    return this.canonicalString();\n  }\n\n  /**\n   * Creates a resource path from the given slash-delimited string.\n   */\n  static fromString(path: string): ResourcePath {\n    // NOTE: The client is ignorant of any path segments containing escape\n    // sequences (e.g. __id123__) and just passes them through raw (they exist\n    // for legacy reasons and should not be used frequently).\n\n    if (path.indexOf('//') >= 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Invalid path (${path}). Paths must not contain // in them.`\n      );\n    }\n\n    // We may still have an empty segment at the beginning or end if they had a\n    // leading or trailing slash (which we allow).\n    const segments = path.split('/').filter(segment => segment.length > 0);\n\n    return new ResourcePath(segments);\n  }\n\n  static EMPTY_PATH = new ResourcePath([]);\n}\n\nconst identifierRegExp = /^[_a-zA-Z][_a-zA-Z0-9]*$/;\n\n/** A dot-separated path for navigating sub-objects within a document. */\nexport class FieldPath extends BasePath<FieldPath> {\n  protected construct(\n    segments: string[],\n    offset?: number,\n    length?: number\n  ): FieldPath {\n    return new FieldPath(segments, offset, length);\n  }\n\n  /**\n   * Returns true if the string could be used as a segment in a field path\n   * without escaping.\n   */\n  private static isValidIdentifier(segment: string): boolean {\n    return identifierRegExp.test(segment);\n  }\n\n  canonicalString(): string {\n    return this.toArray()\n      .map(str => {\n        str = str.replace('\\\\', '\\\\\\\\').replace('`', '\\\\`');\n        if (!FieldPath.isValidIdentifier(str)) {\n          str = '`' + str + '`';\n        }\n        return str;\n      })\n      .join('.');\n  }\n\n  toString(): string {\n    return this.canonicalString();\n  }\n\n  /**\n   * Returns true if this field references the key of a document.\n   */\n  isKeyField(): boolean {\n    return this.length === 1 && this.get(0) === DOCUMENT_KEY_NAME;\n  }\n\n  /**\n   * The field designating the key of a document.\n   */\n  static keyField(): FieldPath {\n    return new FieldPath([DOCUMENT_KEY_NAME]);\n  }\n\n  /**\n   * Parses a field string from the given server-formatted string.\n   *\n   * - Splitting the empty string is not allowed (for now at least).\n   * - Empty segments within the string (e.g. if there are two consecutive\n   *   separators) are not allowed.\n   *\n   * TODO(b/37244157): we should make this more strict. Right now, it allows\n   * non-identifier path components, even if they aren't escaped.\n   */\n  static fromServerFormat(path: string): FieldPath {\n    const segments: string[] = [];\n    let current = '';\n    let i = 0;\n\n    const addCurrentSegment = (): void => {\n      if (current.length === 0) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          `Invalid field path (${path}). Paths must not be empty, begin ` +\n            `with '.', end with '.', or contain '..'`\n        );\n      }\n      segments.push(current);\n      current = '';\n    };\n\n    let inBackticks = false;\n\n    while (i < path.length) {\n      const c = path[i];\n      if (c === '\\\\') {\n        if (i + 1 === path.length) {\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            'Path has trailing escape character: ' + path\n          );\n        }\n        const next = path[i + 1];\n        if (!(next === '\\\\' || next === '.' || next === '`')) {\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            'Path has invalid escape sequence: ' + path\n          );\n        }\n        current += next;\n        i += 2;\n      } else if (c === '`') {\n        inBackticks = !inBackticks;\n        i++;\n      } else if (c === '.' && !inBackticks) {\n        addCurrentSegment();\n        i++;\n      } else {\n        current += c;\n        i++;\n      }\n    }\n    addCurrentSegment();\n\n    if (inBackticks) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Unterminated ` in path: ' + path\n      );\n    }\n\n    return new FieldPath(segments);\n  }\n\n  static EMPTY_PATH = new FieldPath([]);\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert } from '../util/assert';\n\nimport { ResourcePath } from './path';\n\nexport class DocumentKey {\n  constructor(readonly path: ResourcePath) {\n    debugAssert(\n      DocumentKey.isDocumentKey(path),\n      'Invalid DocumentKey with an odd number of segments: ' +\n        path.toArray().join('/')\n    );\n  }\n\n  static fromName(name: string): DocumentKey {\n    return new DocumentKey(ResourcePath.fromString(name).popFirst(5));\n  }\n\n  /** Returns true if the document is in the specified collectionId. */\n  hasCollectionId(collectionId: string): boolean {\n    return (\n      this.path.length >= 2 &&\n      this.path.get(this.path.length - 2) === collectionId\n    );\n  }\n\n  isEqual(other: DocumentKey | null): boolean {\n    return (\n      other !== null && ResourcePath.comparator(this.path, other.path) === 0\n    );\n  }\n\n  toString(): string {\n    return this.path.toString();\n  }\n\n  static EMPTY = new DocumentKey(new ResourcePath([]));\n\n  static comparator(k1: DocumentKey, k2: DocumentKey): number {\n    return ResourcePath.comparator(k1.path, k2.path);\n  }\n\n  static isDocumentKey(path: ResourcePath): boolean {\n    return path.length % 2 === 0;\n  }\n\n  /**\n   * Creates and returns a new document key with the given segments.\n   *\n   * @param segments The segments of the path to the document\n   * @return A new instance of DocumentKey\n   */\n  static fromSegments(segments: string[]): DocumentKey {\n    return new DocumentKey(new ResourcePath(segments.slice()));\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert } from './assert';\n\nexport interface Dict<V> {\n  [stringKey: string]: V;\n}\n\nexport function objectSize<V>(obj: object): number {\n  let count = 0;\n  for (const key in obj) {\n    if (Object.prototype.hasOwnProperty.call(obj, key)) {\n      count++;\n    }\n  }\n  return count;\n}\n\nexport function forEach<V>(\n  obj: Dict<V>,\n  fn: (key: string, val: V) => void\n): void {\n  for (const key in obj) {\n    if (Object.prototype.hasOwnProperty.call(obj, key)) {\n      fn(key, obj[key]);\n    }\n  }\n}\n\nexport function isEmpty<V>(obj: Dict<V>): boolean {\n  debugAssert(\n    obj != null && typeof obj === 'object',\n    'isEmpty() expects object parameter.'\n  );\n  for (const key in obj) {\n    if (Object.prototype.hasOwnProperty.call(obj, key)) {\n      return false;\n    }\n  }\n  return true;\n}\n","/**\n * @license\n * Copyright 2020 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { PlatformSupport } from '../platform/platform';\nimport { primitiveComparator } from './misc';\n\n/**\n * Immutable class that represents a \"proto\" byte string.\n *\n * Proto byte strings can either be Base64-encoded strings or Uint8Arrays when\n * sent on the wire. This class abstracts away this differentiation by holding\n * the proto byte string in a common class that must be converted into a string\n * before being sent as a proto.\n */\nexport class ByteString {\n  static readonly EMPTY_BYTE_STRING = new ByteString('');\n\n  private constructor(private readonly binaryString: string) {}\n\n  static fromBase64String(base64: string): ByteString {\n    const binaryString = PlatformSupport.getPlatform().atob(base64);\n    return new ByteString(binaryString);\n  }\n\n  static fromUint8Array(array: Uint8Array): ByteString {\n    const binaryString = binaryStringFromUint8Array(array);\n    return new ByteString(binaryString);\n  }\n\n  toBase64(): string {\n    return PlatformSupport.getPlatform().btoa(this.binaryString);\n  }\n\n  toUint8Array(): Uint8Array {\n    return uint8ArrayFromBinaryString(this.binaryString);\n  }\n\n  approximateByteSize(): number {\n    return this.binaryString.length * 2;\n  }\n\n  compareTo(other: ByteString): number {\n    return primitiveComparator(this.binaryString, other.binaryString);\n  }\n\n  isEqual(other: ByteString): boolean {\n    return this.binaryString === other.binaryString;\n  }\n}\n\n/**\n * Helper function to convert an Uint8array to a binary string.\n */\nexport function binaryStringFromUint8Array(array: Uint8Array): string {\n  let binaryString = '';\n  for (let i = 0; i < array.length; ++i) {\n    binaryString += String.fromCharCode(array[i]);\n  }\n  return binaryString;\n}\n\n/**\n * Helper function to convert a binary string to an Uint8Array.\n */\nexport function uint8ArrayFromBinaryString(binaryString: string): Uint8Array {\n  const buffer = new Uint8Array(binaryString.length);\n  for (let i = 0; i < binaryString.length; i++) {\n    buffer[i] = binaryString.charCodeAt(i);\n  }\n  return buffer;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n// An Object whose keys and values are strings.\nexport interface StringMap {\n  [key: string]: string;\n}\n\n/**\n * Returns whether a variable is either undefined or null.\n */\nexport function isNullOrUndefined(value: unknown): value is null | undefined {\n  return value === null || value === undefined;\n}\n\n/** Returns whether the value represents -0. */\nexport function isNegativeZero(value: number): boolean {\n  // Detect if the value is -0.0. Based on polyfill from\n  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is\n  return value === -0 && 1 / value === 1 / -0;\n}\n\n/**\n * Returns whether a value is an integer and in the safe integer range\n * @param value The value to test for being an integer and in the safe range\n */\nexport function isSafeInteger(value: unknown): boolean {\n  return (\n    typeof value === 'number' &&\n    Number.isInteger(value) &&\n    !isNegativeZero(value) &&\n    value <= Number.MAX_SAFE_INTEGER &&\n    value >= Number.MIN_SAFE_INTEGER\n  );\n}\n","/**\n * @license\n * Copyright 2020 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as api from '../protos/firestore_proto_api';\nimport { Timestamp } from '../api/timestamp';\nimport { normalizeTimestamp } from './values';\n\n/**\n * Represents a locally-applied ServerTimestamp.\n *\n * Server Timestamps are backed by MapValues that contain an internal field\n * `__type__` with a value of `server_timestamp`. The previous value and local\n * write time are stored in its `__previous_value__` and `__local_write_time__`\n * fields respectively.\n *\n * Notes:\n * - ServerTimestampValue instances are created as the result of applying a\n *   TransformMutation (see TransformMutation.applyTo()). They can only exist in\n *   the local view of a document. Therefore they do not need to be parsed or\n *   serialized.\n * - When evaluated locally (e.g. for snapshot.data()), they by default\n *   evaluate to `null`. This behavior can be configured by passing custom\n *   FieldValueOptions to value().\n * - With respect to other ServerTimestampValues, they sort by their\n *   localWriteTime.\n */\n\nconst SERVER_TIMESTAMP_SENTINEL = 'server_timestamp';\nconst TYPE_KEY = '__type__';\nconst PREVIOUS_VALUE_KEY = '__previous_value__';\nconst LOCAL_WRITE_TIME_KEY = '__local_write_time__';\n\nexport function isServerTimestamp(value: api.Value | null): boolean {\n  const type = (value?.mapValue?.fields || {})[TYPE_KEY]?.stringValue;\n  return type === SERVER_TIMESTAMP_SENTINEL;\n}\n\n/**\n * Creates a new ServerTimestamp proto value (using the internal format).\n */\nexport function serverTimestamp(\n  localWriteTime: Timestamp,\n  previousValue: api.Value | null\n): api.Value {\n  const mapValue: api.MapValue = {\n    fields: {\n      [TYPE_KEY]: {\n        stringValue: SERVER_TIMESTAMP_SENTINEL\n      },\n      [LOCAL_WRITE_TIME_KEY]: {\n        timestampValue: {\n          seconds: localWriteTime.seconds,\n          nanos: localWriteTime.nanoseconds\n        }\n      }\n    }\n  };\n\n  if (previousValue) {\n    mapValue.fields![PREVIOUS_VALUE_KEY] = previousValue;\n  }\n\n  return { mapValue };\n}\n\n/**\n * Returns the value of the field before this ServerTimestamp was set.\n *\n * Preserving the previous values allows the user to display the last resoled\n * value until the backend responds with the timestamp.\n */\nexport function getPreviousValue(value: api.Value): api.Value | null {\n  const previousValue = value.mapValue!.fields![PREVIOUS_VALUE_KEY];\n\n  if (isServerTimestamp(previousValue)) {\n    return getPreviousValue(previousValue);\n  }\n  return previousValue;\n}\n\n/**\n * Returns the local time at which this timestamp was first set.\n */\nexport function getLocalWriteTime(value: api.Value): Timestamp {\n  const localWriteTime = normalizeTimestamp(\n    value.mapValue!.fields![LOCAL_WRITE_TIME_KEY].timestampValue!\n  );\n  return new Timestamp(localWriteTime.seconds, localWriteTime.nanos);\n}\n","/**\n * @license\n * Copyright 2020 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { TypeOrder } from './object_value';\nimport { fail, hardAssert } from '../util/assert';\nimport { forEach, objectSize } from '../util/obj';\nimport { ByteString } from '../util/byte_string';\nimport { isNegativeZero } from '../util/types';\nimport { DocumentKey } from './document_key';\nimport { arrayEquals, primitiveComparator } from '../util/misc';\nimport { DatabaseId } from '../core/database_info';\nimport {\n  getLocalWriteTime,\n  getPreviousValue,\n  isServerTimestamp\n} from './server_timestamps';\n\n// A RegExp matching ISO 8601 UTC timestamps with optional fraction.\nconst ISO_TIMESTAMP_REG_EXP = new RegExp(\n  /^\\d{4}-\\d\\d-\\d\\dT\\d\\d:\\d\\d:\\d\\d(?:\\.(\\d+))?Z$/\n);\n\n/** Extracts the backend's type order for the provided value. */\nexport function typeOrder(value: api.Value): TypeOrder {\n  if ('nullValue' in value) {\n    return TypeOrder.NullValue;\n  } else if ('booleanValue' in value) {\n    return TypeOrder.BooleanValue;\n  } else if ('integerValue' in value || 'doubleValue' in value) {\n    return TypeOrder.NumberValue;\n  } else if ('timestampValue' in value) {\n    return TypeOrder.TimestampValue;\n  } else if ('stringValue' in value) {\n    return TypeOrder.StringValue;\n  } else if ('bytesValue' in value) {\n    return TypeOrder.BlobValue;\n  } else if ('referenceValue' in value) {\n    return TypeOrder.RefValue;\n  } else if ('geoPointValue' in value) {\n    return TypeOrder.GeoPointValue;\n  } else if ('arrayValue' in value) {\n    return TypeOrder.ArrayValue;\n  } else if ('mapValue' in value) {\n    if (isServerTimestamp(value)) {\n      return TypeOrder.ServerTimestampValue;\n    }\n    return TypeOrder.ObjectValue;\n  } else {\n    return fail('Invalid value type: ' + JSON.stringify(value));\n  }\n}\n\n/** Tests `left` and `right` for equality based on the backend semantics. */\nexport function valueEquals(left: api.Value, right: api.Value): boolean {\n  const leftType = typeOrder(left);\n  const rightType = typeOrder(right);\n  if (leftType !== rightType) {\n    return false;\n  }\n\n  switch (leftType) {\n    case TypeOrder.NullValue:\n      return true;\n    case TypeOrder.BooleanValue:\n      return left.booleanValue === right.booleanValue;\n    case TypeOrder.ServerTimestampValue:\n      return getLocalWriteTime(left).isEqual(getLocalWriteTime(right));\n    case TypeOrder.TimestampValue:\n      return timestampEquals(left, right);\n    case TypeOrder.StringValue:\n      return left.stringValue === right.stringValue;\n    case TypeOrder.BlobValue:\n      return blobEquals(left, right);\n    case TypeOrder.RefValue:\n      return left.referenceValue === right.referenceValue;\n    case TypeOrder.GeoPointValue:\n      return geoPointEquals(left, right);\n    case TypeOrder.NumberValue:\n      return numberEquals(left, right);\n    case TypeOrder.ArrayValue:\n      return arrayEquals(\n        left.arrayValue!.values || [],\n        right.arrayValue!.values || [],\n        valueEquals\n      );\n    case TypeOrder.ObjectValue:\n      return objectEquals(left, right);\n    default:\n      return fail('Unexpected value type: ' + JSON.stringify(left));\n  }\n}\n\nfunction timestampEquals(left: api.Value, right: api.Value): boolean {\n  if (\n    typeof left.timestampValue === 'string' &&\n    typeof right.timestampValue === 'string' &&\n    left.timestampValue.length === right.timestampValue.length\n  ) {\n    // Use string equality for ISO 8601 timestamps\n    return left.timestampValue === right.timestampValue;\n  }\n\n  const leftTimestamp = normalizeTimestamp(left.timestampValue!);\n  const rightTimestamp = normalizeTimestamp(right.timestampValue!);\n  return (\n    leftTimestamp.seconds === rightTimestamp.seconds &&\n    leftTimestamp.nanos === rightTimestamp.nanos\n  );\n}\n\nfunction geoPointEquals(left: api.Value, right: api.Value): boolean {\n  return (\n    normalizeNumber(left.geoPointValue!.latitude) ===\n      normalizeNumber(right.geoPointValue!.latitude) &&\n    normalizeNumber(left.geoPointValue!.longitude) ===\n      normalizeNumber(right.geoPointValue!.longitude)\n  );\n}\n\nfunction blobEquals(left: api.Value, right: api.Value): boolean {\n  return normalizeByteString(left.bytesValue!).isEqual(\n    normalizeByteString(right.bytesValue!)\n  );\n}\n\nexport function numberEquals(left: api.Value, right: api.Value): boolean {\n  if ('integerValue' in left && 'integerValue' in right) {\n    return (\n      normalizeNumber(left.integerValue) === normalizeNumber(right.integerValue)\n    );\n  } else if ('doubleValue' in left && 'doubleValue' in right) {\n    const n1 = normalizeNumber(left.doubleValue!);\n    const n2 = normalizeNumber(right.doubleValue!);\n\n    if (n1 === n2) {\n      return isNegativeZero(n1) === isNegativeZero(n2);\n    } else {\n      return isNaN(n1) && isNaN(n2);\n    }\n  }\n\n  return false;\n}\n\nfunction objectEquals(left: api.Value, right: api.Value): boolean {\n  const leftMap = left.mapValue!.fields || {};\n  const rightMap = right.mapValue!.fields || {};\n\n  if (objectSize(leftMap) !== objectSize(rightMap)) {\n    return false;\n  }\n\n  for (const key in leftMap) {\n    if (leftMap.hasOwnProperty(key)) {\n      if (\n        rightMap[key] === undefined ||\n        !valueEquals(leftMap[key], rightMap[key])\n      ) {\n        return false;\n      }\n    }\n  }\n  return true;\n}\n\n/** Returns true if the ArrayValue contains the specified element. */\nexport function arrayValueContains(\n  haystack: api.ArrayValue,\n  needle: api.Value\n): boolean {\n  return (\n    (haystack.values || []).find(v => valueEquals(v, needle)) !== undefined\n  );\n}\n\nexport function valueCompare(left: api.Value, right: api.Value): number {\n  const leftType = typeOrder(left);\n  const rightType = typeOrder(right);\n\n  if (leftType !== rightType) {\n    return primitiveComparator(leftType, rightType);\n  }\n\n  switch (leftType) {\n    case TypeOrder.NullValue:\n      return 0;\n    case TypeOrder.BooleanValue:\n      return primitiveComparator(left.booleanValue!, right.booleanValue!);\n    case TypeOrder.NumberValue:\n      return compareNumbers(left, right);\n    case TypeOrder.TimestampValue:\n      return compareTimestamps(left.timestampValue!, right.timestampValue!);\n    case TypeOrder.ServerTimestampValue:\n      return compareTimestamps(\n        getLocalWriteTime(left),\n        getLocalWriteTime(right)\n      );\n    case TypeOrder.StringValue:\n      return primitiveComparator(left.stringValue!, right.stringValue!);\n    case TypeOrder.BlobValue:\n      return compareBlobs(left.bytesValue!, right.bytesValue!);\n    case TypeOrder.RefValue:\n      return compareReferences(left.referenceValue!, right.referenceValue!);\n    case TypeOrder.GeoPointValue:\n      return compareGeoPoints(left.geoPointValue!, right.geoPointValue!);\n    case TypeOrder.ArrayValue:\n      return compareArrays(left.arrayValue!, right.arrayValue!);\n    case TypeOrder.ObjectValue:\n      return compareMaps(left.mapValue!, right.mapValue!);\n    default:\n      throw fail('Invalid value type: ' + leftType);\n  }\n}\n\nfunction compareNumbers(left: api.Value, right: api.Value): number {\n  const leftNumber = normalizeNumber(left.integerValue || left.doubleValue);\n  const rightNumber = normalizeNumber(right.integerValue || right.doubleValue);\n\n  if (leftNumber < rightNumber) {\n    return -1;\n  } else if (leftNumber > rightNumber) {\n    return 1;\n  } else if (leftNumber === rightNumber) {\n    return 0;\n  } else {\n    // one or both are NaN.\n    if (isNaN(leftNumber)) {\n      return isNaN(rightNumber) ? 0 : -1;\n    } else {\n      return 1;\n    }\n  }\n}\n\nfunction compareTimestamps(left: api.Timestamp, right: api.Timestamp): number {\n  if (\n    typeof left === 'string' &&\n    typeof right === 'string' &&\n    left.length === right.length\n  ) {\n    return primitiveComparator(left, right);\n  }\n\n  const leftTimestamp = normalizeTimestamp(left);\n  const rightTimestamp = normalizeTimestamp(right);\n\n  const comparison = primitiveComparator(\n    leftTimestamp.seconds,\n    rightTimestamp.seconds\n  );\n  if (comparison !== 0) {\n    return comparison;\n  }\n  return primitiveComparator(leftTimestamp.nanos, rightTimestamp.nanos);\n}\n\nfunction compareReferences(leftPath: string, rightPath: string): number {\n  const leftSegments = leftPath.split('/');\n  const rightSegments = rightPath.split('/');\n  for (let i = 0; i < leftSegments.length && i < rightSegments.length; i++) {\n    const comparison = primitiveComparator(leftSegments[i], rightSegments[i]);\n    if (comparison !== 0) {\n      return comparison;\n    }\n  }\n  return primitiveComparator(leftSegments.length, rightSegments.length);\n}\n\nfunction compareGeoPoints(left: api.LatLng, right: api.LatLng): number {\n  const comparison = primitiveComparator(\n    normalizeNumber(left.latitude),\n    normalizeNumber(right.latitude)\n  );\n  if (comparison !== 0) {\n    return comparison;\n  }\n  return primitiveComparator(\n    normalizeNumber(left.longitude),\n    normalizeNumber(right.longitude)\n  );\n}\n\nfunction compareBlobs(\n  left: string | Uint8Array,\n  right: string | Uint8Array\n): number {\n  const leftBytes = normalizeByteString(left);\n  const rightBytes = normalizeByteString(right);\n  return leftBytes.compareTo(rightBytes);\n}\n\nfunction compareArrays(left: api.ArrayValue, right: api.ArrayValue): number {\n  const leftArray = left.values || [];\n  const rightArray = right.values || [];\n\n  for (let i = 0; i < leftArray.length && i < rightArray.length; ++i) {\n    const compare = valueCompare(leftArray[i], rightArray[i]);\n    if (compare) {\n      return compare;\n    }\n  }\n  return primitiveComparator(leftArray.length, rightArray.length);\n}\n\nfunction compareMaps(left: api.MapValue, right: api.MapValue): number {\n  const leftMap = left.fields || {};\n  const leftKeys = Object.keys(leftMap);\n  const rightMap = right.fields || {};\n  const rightKeys = Object.keys(rightMap);\n\n  // Even though MapValues are likely sorted correctly based on their insertion\n  // order (e.g. when received from the backend), local modifications can bring\n  // elements out of order. We need to re-sort the elements to ensure that\n  // canonical IDs are independent of insertion order.\n  leftKeys.sort();\n  rightKeys.sort();\n\n  for (let i = 0; i < leftKeys.length && i < rightKeys.length; ++i) {\n    const keyCompare = primitiveComparator(leftKeys[i], rightKeys[i]);\n    if (keyCompare !== 0) {\n      return keyCompare;\n    }\n    const compare = valueCompare(leftMap[leftKeys[i]], rightMap[rightKeys[i]]);\n    if (compare !== 0) {\n      return compare;\n    }\n  }\n\n  return primitiveComparator(leftKeys.length, rightKeys.length);\n}\n\n/**\n * Generates the canonical ID for the provided field value (as used in Target\n * serialization).\n */\nexport function canonicalId(value: api.Value): string {\n  return canonifyValue(value);\n}\n\nfunction canonifyValue(value: api.Value): string {\n  if ('nullValue' in value) {\n    return 'null';\n  } else if ('booleanValue' in value) {\n    return '' + value.booleanValue!;\n  } else if ('integerValue' in value) {\n    return '' + value.integerValue!;\n  } else if ('doubleValue' in value) {\n    return '' + value.doubleValue!;\n  } else if ('timestampValue' in value) {\n    return canonifyTimestamp(value.timestampValue!);\n  } else if ('stringValue' in value) {\n    return value.stringValue!;\n  } else if ('bytesValue' in value) {\n    return canonifyByteString(value.bytesValue!);\n  } else if ('referenceValue' in value) {\n    return canonifyReference(value.referenceValue!);\n  } else if ('geoPointValue' in value) {\n    return canonifyGeoPoint(value.geoPointValue!);\n  } else if ('arrayValue' in value) {\n    return canonifyArray(value.arrayValue!);\n  } else if ('mapValue' in value) {\n    return canonifyMap(value.mapValue!);\n  } else {\n    return fail('Invalid value type: ' + JSON.stringify(value));\n  }\n}\n\nfunction canonifyByteString(byteString: string | Uint8Array): string {\n  return normalizeByteString(byteString).toBase64();\n}\n\nfunction canonifyTimestamp(timestamp: api.Timestamp): string {\n  const normalizedTimestamp = normalizeTimestamp(timestamp);\n  return `time(${normalizedTimestamp.seconds},${normalizedTimestamp.nanos})`;\n}\n\nfunction canonifyGeoPoint(geoPoint: api.LatLng): string {\n  return `geo(${geoPoint.latitude},${geoPoint.longitude})`;\n}\n\nfunction canonifyReference(referenceValue: string): string {\n  return DocumentKey.fromName(referenceValue).toString();\n}\n\nfunction canonifyMap(mapValue: api.MapValue): string {\n  // Iteration order in JavaScript is not guaranteed. To ensure that we generate\n  // matching canonical IDs for identical maps, we need to sort the keys.\n  const sortedKeys = Object.keys(mapValue.fields || {}).sort();\n\n  let result = '{';\n  let first = true;\n  for (const key of sortedKeys) {\n    if (!first) {\n      result += ',';\n    } else {\n      first = false;\n    }\n    result += `${key}:${canonifyValue(mapValue.fields![key])}`;\n  }\n  return result + '}';\n}\n\nfunction canonifyArray(arrayValue: api.ArrayValue): string {\n  let result = '[';\n  let first = true;\n  for (const value of arrayValue.values || []) {\n    if (!first) {\n      result += ',';\n    } else {\n      first = false;\n    }\n    result += canonifyValue(value);\n  }\n  return result + ']';\n}\n\n/**\n * Returns an approximate (and wildly inaccurate) in-memory size for the field\n * value.\n *\n * The memory size takes into account only the actual user data as it resides\n * in memory and ignores object overhead.\n */\nexport function estimateByteSize(value: api.Value): number {\n  switch (typeOrder(value)) {\n    case TypeOrder.NullValue:\n      return 4;\n    case TypeOrder.BooleanValue:\n      return 4;\n    case TypeOrder.NumberValue:\n      return 8;\n    case TypeOrder.TimestampValue:\n      // Timestamps are made up of two distinct numbers (seconds + nanoseconds)\n      return 16;\n    case TypeOrder.ServerTimestampValue:\n      const previousValue = getPreviousValue(value);\n      return previousValue ? 16 + estimateByteSize(previousValue) : 16;\n    case TypeOrder.StringValue:\n      // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures:\n      // \"JavaScript's String type is [...] a set of elements of 16-bit unsigned\n      // integer values\"\n      return value.stringValue!.length * 2;\n    case TypeOrder.BlobValue:\n      return normalizeByteString(value.bytesValue!).approximateByteSize();\n    case TypeOrder.RefValue:\n      return value.referenceValue!.length;\n    case TypeOrder.GeoPointValue:\n      // GeoPoints are made up of two distinct numbers (latitude + longitude)\n      return 16;\n    case TypeOrder.ArrayValue:\n      return estimateArrayByteSize(value.arrayValue!);\n    case TypeOrder.ObjectValue:\n      return estimateMapByteSize(value.mapValue!);\n    default:\n      throw fail('Invalid value type: ' + JSON.stringify(value));\n  }\n}\n\nfunction estimateMapByteSize(mapValue: api.MapValue): number {\n  let size = 0;\n  forEach(mapValue.fields || {}, (key, val) => {\n    size += key.length + estimateByteSize(val);\n  });\n  return size;\n}\n\nfunction estimateArrayByteSize(arrayValue: api.ArrayValue): number {\n  return (arrayValue.values || []).reduce(\n    (previousSize, value) => previousSize + estimateByteSize(value),\n    0\n  );\n}\n\n/**\n * Converts the possible Proto values for a timestamp value into a \"seconds and\n * nanos\" representation.\n */\nexport function normalizeTimestamp(\n  date: api.Timestamp\n): { seconds: number; nanos: number } {\n  hardAssert(!!date, 'Cannot normalize null or undefined timestamp.');\n\n  // The json interface (for the browser) will return an iso timestamp string,\n  // while the proto js library (for node) will return a\n  // google.protobuf.Timestamp instance.\n  if (typeof date === 'string') {\n    // The date string can have higher precision (nanos) than the Date class\n    // (millis), so we do some custom parsing here.\n\n    // Parse the nanos right out of the string.\n    let nanos = 0;\n    const fraction = ISO_TIMESTAMP_REG_EXP.exec(date);\n    hardAssert(!!fraction, 'invalid timestamp: ' + date);\n    if (fraction[1]) {\n      // Pad the fraction out to 9 digits (nanos).\n      let nanoStr = fraction[1];\n      nanoStr = (nanoStr + '000000000').substr(0, 9);\n      nanos = Number(nanoStr);\n    }\n\n    // Parse the date to get the seconds.\n    const parsedDate = new Date(date);\n    const seconds = Math.floor(parsedDate.getTime() / 1000);\n\n    return { seconds, nanos };\n  } else {\n    // TODO(b/37282237): Use strings for Proto3 timestamps\n    // assert(!this.options.useProto3Json,\n    //   'The timestamp instance format requires Proto JS.');\n    const seconds = normalizeNumber(date.seconds);\n    const nanos = normalizeNumber(date.nanos);\n    return { seconds, nanos };\n  }\n}\n\n/**\n * Converts the possible Proto types for numbers into a JavaScript number.\n * Returns 0 if the value is not numeric.\n */\nexport function normalizeNumber(value: number | string | undefined): number {\n  // TODO(bjornick): Handle int64 greater than 53 bits.\n  if (typeof value === 'number') {\n    return value;\n  } else if (typeof value === 'string') {\n    return Number(value);\n  } else {\n    return 0;\n  }\n}\n\n/** Converts the possible Proto types for Blobs into a ByteString. */\nexport function normalizeByteString(blob: string | Uint8Array): ByteString {\n  if (typeof blob === 'string') {\n    return ByteString.fromBase64String(blob);\n  } else {\n    return ByteString.fromUint8Array(blob);\n  }\n}\n\n/** Returns a reference value for the provided database and key. */\nexport function refValue(databaseId: DatabaseId, key: DocumentKey): api.Value {\n  return {\n    referenceValue: `projects/${databaseId.projectId}/databases/${\n      databaseId.database\n    }/documents/${key.path.canonicalString()}`\n  };\n}\n\n/** Returns true if `value` is an IntegerValue . */\nexport function isInteger(\n  value?: api.Value | null\n): value is { integerValue: string | number } {\n  return !!value && 'integerValue' in value;\n}\n\n/** Returns true if `value` is a DoubleValue. */\nexport function isDouble(\n  value?: api.Value | null\n): value is { doubleValue: string | number } {\n  return !!value && 'doubleValue' in value;\n}\n\n/** Returns true if `value` is either an IntegerValue or a DoubleValue. */\nexport function isNumber(value?: api.Value | null): boolean {\n  return isInteger(value) || isDouble(value);\n}\n\n/** Returns true if `value` is an ArrayValue. */\nexport function isArray(\n  value?: api.Value | null\n): value is { arrayValue: api.ArrayValue } {\n  return !!value && 'arrayValue' in value;\n}\n\n/** Returns true if `value` is a ReferenceValue. */\nexport function isReferenceValue(\n  value?: api.Value | null\n): value is { referenceValue: string } {\n  return !!value && 'referenceValue' in value;\n}\n\n/** Returns true if `value` is a NullValue. */\nexport function isNullValue(\n  value?: api.Value | null\n): value is { nullValue: 'NULL_VALUE' } {\n  return !!value && 'nullValue' in value;\n}\n\n/** Returns true if `value` is NaN. */\nexport function isNanValue(\n  value?: api.Value | null\n): value is { doubleValue: 'NaN' | number } {\n  return !!value && 'doubleValue' in value && isNaN(Number(value.doubleValue));\n}\n\n/** Returns true if `value` is a MapValue. */\nexport function isMapValue(\n  value?: api.Value | null\n): value is { mapValue: api.MapValue } {\n  return !!value && 'mapValue' in value;\n}\n","/**\n * @license\n * Copyright 2018 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { Timestamp } from '../api/timestamp';\nimport { debugAssert } from '../util/assert';\nimport { JsonProtoSerializer } from '../remote/serializer';\nimport {\n  valueEquals,\n  isArray,\n  isInteger,\n  isNumber,\n  normalizeNumber\n} from './values';\nimport { serverTimestamp } from './server_timestamps';\nimport { arrayEquals } from '../util/misc';\n\n/** Represents a transform within a TransformMutation. */\nexport interface TransformOperation {\n  /**\n   * Computes the local transform result against the provided `previousValue`,\n   * optionally using the provided localWriteTime.\n   */\n  applyToLocalView(\n    previousValue: api.Value | null,\n    localWriteTime: Timestamp\n  ): api.Value;\n\n  /**\n   * Computes a final transform result after the transform has been acknowledged\n   * by the server, potentially using the server-provided transformResult.\n   */\n  applyToRemoteDocument(\n    previousValue: api.Value | null,\n    transformResult: api.Value | null\n  ): api.Value;\n\n  /**\n   * If this transform operation is not idempotent, returns the base value to\n   * persist for this transform. If a base value is returned, the transform\n   * operation is always applied to this base value, even if document has\n   * already been updated.\n   *\n   * Base values provide consistent behavior for non-idempotent transforms and\n   * allow us to return the same latency-compensated value even if the backend\n   * has already applied the transform operation. The base value is null for\n   * idempotent transforms, as they can be re-played even if the backend has\n   * already applied them.\n   *\n   * @return a base value to store along with the mutation, or null for\n   * idempotent transforms.\n   */\n  computeBaseValue(previousValue: api.Value | null): api.Value | null;\n\n  isEqual(other: TransformOperation): boolean;\n}\n\n/** Transforms a value into a server-generated timestamp. */\nexport class ServerTimestampTransform implements TransformOperation {\n  private constructor() {}\n  static instance = new ServerTimestampTransform();\n\n  applyToLocalView(\n    previousValue: api.Value | null,\n    localWriteTime: Timestamp\n  ): api.Value {\n    return serverTimestamp(localWriteTime!, previousValue);\n  }\n\n  applyToRemoteDocument(\n    previousValue: api.Value | null,\n    transformResult: api.Value | null\n  ): api.Value {\n    return transformResult!;\n  }\n\n  computeBaseValue(previousValue: api.Value | null): api.Value | null {\n    return null; // Server timestamps are idempotent and don't require a base value.\n  }\n\n  isEqual(other: TransformOperation): boolean {\n    return other instanceof ServerTimestampTransform;\n  }\n}\n\n/** Transforms an array value via a union operation. */\nexport class ArrayUnionTransformOperation implements TransformOperation {\n  constructor(readonly elements: api.Value[]) {}\n\n  applyToLocalView(\n    previousValue: api.Value | null,\n    localWriteTime: Timestamp\n  ): api.Value {\n    return this.apply(previousValue);\n  }\n\n  applyToRemoteDocument(\n    previousValue: api.Value | null,\n    transformResult: api.Value | null\n  ): api.Value {\n    // The server just sends null as the transform result for array operations,\n    // so we have to calculate a result the same as we do for local\n    // applications.\n    return this.apply(previousValue);\n  }\n\n  private apply(previousValue: api.Value | null): api.Value {\n    const values = coercedFieldValuesArray(previousValue);\n    for (const toUnion of this.elements) {\n      if (!values.some(element => valueEquals(element, toUnion))) {\n        values.push(toUnion);\n      }\n    }\n    return { arrayValue: { values } };\n  }\n\n  computeBaseValue(previousValue: api.Value | null): api.Value | null {\n    return null; // Array transforms are idempotent and don't require a base value.\n  }\n\n  isEqual(other: TransformOperation): boolean {\n    return (\n      other instanceof ArrayUnionTransformOperation &&\n      arrayEquals(this.elements, other.elements, valueEquals)\n    );\n  }\n}\n\n/** Transforms an array value via a remove operation. */\nexport class ArrayRemoveTransformOperation implements TransformOperation {\n  constructor(readonly elements: api.Value[]) {}\n\n  applyToLocalView(\n    previousValue: api.Value | null,\n    localWriteTime: Timestamp\n  ): api.Value {\n    return this.apply(previousValue);\n  }\n\n  applyToRemoteDocument(\n    previousValue: api.Value | null,\n    transformResult: api.Value | null\n  ): api.Value {\n    // The server just sends null as the transform result for array operations,\n    // so we have to calculate a result the same as we do for local\n    // applications.\n    return this.apply(previousValue);\n  }\n\n  private apply(previousValue: api.Value | null): api.Value {\n    let values = coercedFieldValuesArray(previousValue);\n    for (const toRemove of this.elements) {\n      values = values.filter(element => !valueEquals(element, toRemove));\n    }\n    return { arrayValue: { values } };\n  }\n\n  computeBaseValue(previousValue: api.Value | null): api.Value | null {\n    return null; // Array transforms are idempotent and don't require a base value.\n  }\n\n  isEqual(other: TransformOperation): boolean {\n    return (\n      other instanceof ArrayRemoveTransformOperation &&\n      arrayEquals(this.elements, other.elements, valueEquals)\n    );\n  }\n}\n\n/**\n * Implements the backend semantics for locally computed NUMERIC_ADD (increment)\n * transforms. Converts all field values to integers or doubles, but unlike the\n * backend does not cap integer values at 2^63. Instead, JavaScript number\n * arithmetic is used and precision loss can occur for values greater than 2^53.\n */\nexport class NumericIncrementTransformOperation implements TransformOperation {\n  constructor(\n    private readonly serializer: JsonProtoSerializer,\n    readonly operand: api.Value\n  ) {\n    debugAssert(\n      isNumber(operand),\n      'NumericIncrementTransform transform requires a NumberValue'\n    );\n  }\n\n  applyToLocalView(\n    previousValue: api.Value | null,\n    localWriteTime: Timestamp\n  ): api.Value {\n    // PORTING NOTE: Since JavaScript's integer arithmetic is limited to 53 bit\n    // precision and resolves overflows by reducing precision, we do not\n    // manually cap overflows at 2^63.\n    const baseValue = this.computeBaseValue(previousValue);\n    const sum = this.asNumber(baseValue) + this.asNumber(this.operand);\n    if (isInteger(baseValue) && isInteger(this.operand)) {\n      return this.serializer.toInteger(sum);\n    } else {\n      return this.serializer.toDouble(sum);\n    }\n  }\n\n  applyToRemoteDocument(\n    previousValue: api.Value | null,\n    transformResult: api.Value | null\n  ): api.Value {\n    debugAssert(\n      transformResult !== null,\n      \"Didn't receive transformResult for NUMERIC_ADD transform\"\n    );\n    return transformResult;\n  }\n\n  /**\n   * Inspects the provided value, returning the provided value if it is already\n   * a NumberValue, otherwise returning a coerced value of 0.\n   */\n  computeBaseValue(previousValue: api.Value | null): api.Value {\n    return isNumber(previousValue) ? previousValue! : { integerValue: 0 };\n  }\n\n  isEqual(other: TransformOperation): boolean {\n    return (\n      other instanceof NumericIncrementTransformOperation &&\n      valueEquals(this.operand, other.operand)\n    );\n  }\n\n  private asNumber(value: api.Value): number {\n    return normalizeNumber(value.integerValue || value.doubleValue);\n  }\n}\n\nfunction coercedFieldValuesArray(value: api.Value | null): api.Value[] {\n  return isArray(value) && value.arrayValue.values\n    ? value.arrayValue.values.slice()\n    : [];\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { Timestamp } from '../api/timestamp';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { debugAssert, fail, hardAssert } from '../util/assert';\n\nimport {\n  Document,\n  MaybeDocument,\n  NoDocument,\n  UnknownDocument\n} from './document';\nimport { DocumentKey } from './document_key';\nimport { ObjectValue, ObjectValueBuilder } from './object_value';\nimport { FieldPath } from './path';\nimport { TransformOperation } from './transform_operation';\nimport { arrayEquals } from '../util/misc';\n\n/**\n * Provides a set of fields that can be used to partially patch a document.\n * FieldMask is used in conjunction with ObjectValue.\n * Examples:\n *   foo - Overwrites foo entirely with the provided value. If foo is not\n *         present in the companion ObjectValue, the field is deleted.\n *   foo.bar - Overwrites only the field bar of the object foo.\n *             If foo is not an object, foo is replaced with an object\n *             containing foo\n */\nexport class FieldMask {\n  constructor(readonly fields: FieldPath[]) {\n    // TODO(dimond): validation of FieldMask\n    // Sort the field mask to support `FieldMask.isEqual()` and assert below.\n    fields.sort(FieldPath.comparator);\n    debugAssert(\n      !fields.some((v, i) => i !== 0 && v.isEqual(fields[i - 1])),\n      'FieldMask contains field that is not unique: ' +\n        fields.find((v, i) => i !== 0 && v.isEqual(fields[i - 1]))!\n    );\n  }\n\n  /**\n   * Verifies that `fieldPath` is included by at least one field in this field\n   * mask.\n   *\n   * This is an O(n) operation, where `n` is the size of the field mask.\n   */\n  covers(fieldPath: FieldPath): boolean {\n    for (const fieldMaskPath of this.fields) {\n      if (fieldMaskPath.isPrefixOf(fieldPath)) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  isEqual(other: FieldMask): boolean {\n    return arrayEquals(this.fields, other.fields, (l, r) => l.isEqual(r));\n  }\n}\n\n/** A field path and the TransformOperation to perform upon it. */\nexport class FieldTransform {\n  constructor(\n    readonly field: FieldPath,\n    readonly transform: TransformOperation\n  ) {}\n\n  isEqual(other: FieldTransform): boolean {\n    return (\n      this.field.isEqual(other.field) && this.transform.isEqual(other.transform)\n    );\n  }\n}\n\n/** The result of successfully applying a mutation to the backend. */\nexport class MutationResult {\n  constructor(\n    /**\n     * The version at which the mutation was committed:\n     *\n     * - For most operations, this is the updateTime in the WriteResult.\n     * - For deletes, the commitTime of the WriteResponse (because deletes are\n     *   not stored and have no updateTime).\n     *\n     * Note that these versions can be different: No-op writes will not change\n     * the updateTime even though the commitTime advances.\n     */\n    readonly version: SnapshotVersion,\n    /**\n     * The resulting fields returned from the backend after a\n     * TransformMutation has been committed. Contains one FieldValue for each\n     * FieldTransform that was in the mutation.\n     *\n     * Will be null if the mutation was not a TransformMutation.\n     */\n    readonly transformResults: Array<api.Value | null> | null\n  ) {}\n}\n\nexport const enum MutationType {\n  Set,\n  Patch,\n  Transform,\n  Delete,\n  Verify\n}\n\n/**\n * Encodes a precondition for a mutation. This follows the model that the\n * backend accepts with the special case of an explicit \"empty\" precondition\n * (meaning no precondition).\n */\nexport class Precondition {\n  private constructor(\n    readonly updateTime?: SnapshotVersion,\n    readonly exists?: boolean\n  ) {\n    debugAssert(\n      updateTime === undefined || exists === undefined,\n      'Precondition can specify \"exists\" or \"updateTime\" but not both'\n    );\n  }\n\n  /** Creates a new empty Precondition. */\n  static none(): Precondition {\n    return new Precondition();\n  }\n\n  /** Creates a new Precondition with an exists flag. */\n  static exists(exists: boolean): Precondition {\n    return new Precondition(undefined, exists);\n  }\n\n  /** Creates a new Precondition based on a version a document exists at. */\n  static updateTime(version: SnapshotVersion): Precondition {\n    return new Precondition(version);\n  }\n\n  /** Returns whether this Precondition is empty. */\n  get isNone(): boolean {\n    return this.updateTime === undefined && this.exists === undefined;\n  }\n\n  /**\n   * Returns true if the preconditions is valid for the given document\n   * (or null if no document is available).\n   */\n  isValidFor(maybeDoc: MaybeDocument | null): boolean {\n    if (this.updateTime !== undefined) {\n      return (\n        maybeDoc instanceof Document &&\n        maybeDoc.version.isEqual(this.updateTime)\n      );\n    } else if (this.exists !== undefined) {\n      return this.exists === maybeDoc instanceof Document;\n    } else {\n      debugAssert(this.isNone, 'Precondition should be empty');\n      return true;\n    }\n  }\n\n  isEqual(other: Precondition): boolean {\n    return (\n      this.exists === other.exists &&\n      (this.updateTime\n        ? !!other.updateTime && this.updateTime.isEqual(other.updateTime)\n        : !other.updateTime)\n    );\n  }\n}\n\n/**\n * A mutation describes a self-contained change to a document. Mutations can\n * create, replace, delete, and update subsets of documents.\n *\n * Mutations not only act on the value of the document but also its version.\n *\n * For local mutations (mutations that haven't been committed yet), we preserve\n * the existing version for Set, Patch, and Transform mutations. For Delete\n * mutations, we reset the version to 0.\n *\n * Here's the expected transition table.\n *\n * MUTATION           APPLIED TO            RESULTS IN\n *\n * SetMutation        Document(v3)          Document(v3)\n * SetMutation        NoDocument(v3)        Document(v0)\n * SetMutation        null                  Document(v0)\n * PatchMutation      Document(v3)          Document(v3)\n * PatchMutation      NoDocument(v3)        NoDocument(v3)\n * PatchMutation      null                  null\n * TransformMutation  Document(v3)          Document(v3)\n * TransformMutation  NoDocument(v3)        NoDocument(v3)\n * TransformMutation  null                  null\n * DeleteMutation     Document(v3)          NoDocument(v0)\n * DeleteMutation     NoDocument(v3)        NoDocument(v0)\n * DeleteMutation     null                  NoDocument(v0)\n *\n * For acknowledged mutations, we use the updateTime of the WriteResponse as\n * the resulting version for Set, Patch, and Transform mutations. As deletes\n * have no explicit update time, we use the commitTime of the WriteResponse for\n * Delete mutations.\n *\n * If a mutation is acknowledged by the backend but fails the precondition check\n * locally, we return an `UnknownDocument` and rely on Watch to send us the\n * updated version.\n *\n * Note that TransformMutations don't create Documents (in the case of being\n * applied to a NoDocument), even though they would on the backend. This is\n * because the client always combines the TransformMutation with a SetMutation\n * or PatchMutation and we only want to apply the transform if the prior\n * mutation resulted in a Document (always true for a SetMutation, but not\n * necessarily for a PatchMutation).\n *\n * ## Subclassing Notes\n *\n * Subclasses of Mutation need to implement applyToRemoteDocument() and\n * applyToLocalView() to implement the actual behavior of applying the mutation\n * to some source document.\n */\nexport abstract class Mutation {\n  abstract readonly type: MutationType;\n  abstract readonly key: DocumentKey;\n  abstract readonly precondition: Precondition;\n\n  /**\n   * Applies this mutation to the given MaybeDocument or null for the purposes\n   * of computing a new remote document. If the input document doesn't match the\n   * expected state (e.g. it is null or outdated), an `UnknownDocument` can be\n   * returned.\n   *\n   * @param maybeDoc The document to mutate. The input document can be null if\n   *     the client has no knowledge of the pre-mutation state of the document.\n   * @param mutationResult The result of applying the mutation from the backend.\n   * @return The mutated document. The returned document may be an\n   *     UnknownDocument if the mutation could not be applied to the locally\n   *     cached base document.\n   */\n  abstract applyToRemoteDocument(\n    maybeDoc: MaybeDocument | null,\n    mutationResult: MutationResult\n  ): MaybeDocument;\n\n  /**\n   * Applies this mutation to the given MaybeDocument or null for the purposes\n   * of computing the new local view of a document. Both the input and returned\n   * documents can be null.\n   *\n   * @param maybeDoc The document to mutate. The input document can be null if\n   *     the client has no knowledge of the pre-mutation state of the document.\n   * @param baseDoc The state of the document prior to this mutation batch. The\n   *     input document can be null if the client has no knowledge of the\n   *     pre-mutation state of the document.\n   * @param localWriteTime A timestamp indicating the local write time of the\n   *     batch this mutation is a part of.\n   * @return The mutated document. The returned document may be null, but only\n   *     if maybeDoc was null and the mutation would not create a new document.\n   */\n  abstract applyToLocalView(\n    maybeDoc: MaybeDocument | null,\n    baseDoc: MaybeDocument | null,\n    localWriteTime: Timestamp\n  ): MaybeDocument | null;\n\n  /**\n   * If this mutation is not idempotent, returns the base value to persist with\n   * this mutation. If a base value is returned, the mutation is always applied\n   * to this base value, even if document has already been updated.\n   *\n   * The base value is a sparse object that consists of only the document\n   * fields for which this mutation contains a non-idempotent transformation\n   * (e.g. a numeric increment). The provided value guarantees consistent\n   * behavior for non-idempotent transforms and allow us to return the same\n   * latency-compensated value even if the backend has already applied the\n   * mutation. The base value is null for idempotent mutations, as they can be\n   * re-played even if the backend has already applied them.\n   *\n   * @return a base value to store along with the mutation, or null for\n   * idempotent mutations.\n   */\n  abstract extractBaseValue(maybeDoc: MaybeDocument | null): ObjectValue | null;\n\n  abstract isEqual(other: Mutation): boolean;\n\n  protected verifyKeyMatches(maybeDoc: MaybeDocument | null): void {\n    if (maybeDoc != null) {\n      debugAssert(\n        maybeDoc.key.isEqual(this.key),\n        'Can only apply a mutation to a document with the same key'\n      );\n    }\n  }\n\n  /**\n   * Returns the version from the given document for use as the result of a\n   * mutation. Mutations are defined to return the version of the base document\n   * only if it is an existing document. Deleted and unknown documents have a\n   * post-mutation version of SnapshotVersion.min().\n   */\n  protected static getPostMutationVersion(\n    maybeDoc: MaybeDocument | null\n  ): SnapshotVersion {\n    if (maybeDoc instanceof Document) {\n      return maybeDoc.version;\n    } else {\n      return SnapshotVersion.min();\n    }\n  }\n}\n\n/**\n * A mutation that creates or replaces the document at the given key with the\n * object value contents.\n */\nexport class SetMutation extends Mutation {\n  constructor(\n    readonly key: DocumentKey,\n    readonly value: ObjectValue,\n    readonly precondition: Precondition\n  ) {\n    super();\n  }\n\n  readonly type: MutationType = MutationType.Set;\n\n  applyToRemoteDocument(\n    maybeDoc: MaybeDocument | null,\n    mutationResult: MutationResult\n  ): MaybeDocument {\n    this.verifyKeyMatches(maybeDoc);\n\n    debugAssert(\n      mutationResult.transformResults == null,\n      'Transform results received by SetMutation.'\n    );\n\n    // Unlike applyToLocalView, if we're applying a mutation to a remote\n    // document the server has accepted the mutation so the precondition must\n    // have held.\n\n    const version = mutationResult.version;\n    return new Document(this.key, version, this.value, {\n      hasCommittedMutations: true\n    });\n  }\n\n  applyToLocalView(\n    maybeDoc: MaybeDocument | null,\n    baseDoc: MaybeDocument | null,\n    localWriteTime: Timestamp\n  ): MaybeDocument | null {\n    this.verifyKeyMatches(maybeDoc);\n\n    if (!this.precondition.isValidFor(maybeDoc)) {\n      return maybeDoc;\n    }\n\n    const version = Mutation.getPostMutationVersion(maybeDoc);\n    return new Document(this.key, version, this.value, {\n      hasLocalMutations: true\n    });\n  }\n\n  extractBaseValue(maybeDoc: MaybeDocument | null): null {\n    return null;\n  }\n\n  isEqual(other: Mutation): boolean {\n    return (\n      other instanceof SetMutation &&\n      this.key.isEqual(other.key) &&\n      this.value.isEqual(other.value) &&\n      this.precondition.isEqual(other.precondition)\n    );\n  }\n}\n\n/**\n * A mutation that modifies fields of the document at the given key with the\n * given values. The values are applied through a field mask:\n *\n *  * When a field is in both the mask and the values, the corresponding field\n *    is updated.\n *  * When a field is in neither the mask nor the values, the corresponding\n *    field is unmodified.\n *  * When a field is in the mask but not in the values, the corresponding field\n *    is deleted.\n *  * When a field is not in the mask but is in the values, the values map is\n *    ignored.\n */\nexport class PatchMutation extends Mutation {\n  constructor(\n    readonly key: DocumentKey,\n    readonly data: ObjectValue,\n    readonly fieldMask: FieldMask,\n    readonly precondition: Precondition\n  ) {\n    super();\n  }\n\n  readonly type: MutationType = MutationType.Patch;\n\n  applyToRemoteDocument(\n    maybeDoc: MaybeDocument | null,\n    mutationResult: MutationResult\n  ): MaybeDocument {\n    this.verifyKeyMatches(maybeDoc);\n\n    debugAssert(\n      mutationResult.transformResults == null,\n      'Transform results received by PatchMutation.'\n    );\n\n    if (!this.precondition.isValidFor(maybeDoc)) {\n      // Since the mutation was not rejected, we know that the  precondition\n      // matched on the backend. We therefore must not have the expected version\n      // of the document in our cache and return an UnknownDocument with the\n      // known updateTime.\n      return new UnknownDocument(this.key, mutationResult.version);\n    }\n\n    const newData = this.patchDocument(maybeDoc);\n    return new Document(this.key, mutationResult.version, newData, {\n      hasCommittedMutations: true\n    });\n  }\n\n  applyToLocalView(\n    maybeDoc: MaybeDocument | null,\n    baseDoc: MaybeDocument | null,\n    localWriteTime: Timestamp\n  ): MaybeDocument | null {\n    this.verifyKeyMatches(maybeDoc);\n\n    if (!this.precondition.isValidFor(maybeDoc)) {\n      return maybeDoc;\n    }\n\n    const version = Mutation.getPostMutationVersion(maybeDoc);\n    const newData = this.patchDocument(maybeDoc);\n    return new Document(this.key, version, newData, {\n      hasLocalMutations: true\n    });\n  }\n\n  extractBaseValue(maybeDoc: MaybeDocument | null): null {\n    return null;\n  }\n\n  isEqual(other: Mutation): boolean {\n    return (\n      other instanceof PatchMutation &&\n      this.key.isEqual(other.key) &&\n      this.fieldMask.isEqual(other.fieldMask) &&\n      this.precondition.isEqual(other.precondition)\n    );\n  }\n\n  /**\n   * Patches the data of document if available or creates a new document. Note\n   * that this does not check whether or not the precondition of this patch\n   * holds.\n   */\n  private patchDocument(maybeDoc: MaybeDocument | null): ObjectValue {\n    let data: ObjectValue;\n    if (maybeDoc instanceof Document) {\n      data = maybeDoc.data();\n    } else {\n      data = ObjectValue.empty();\n    }\n    return this.patchObject(data);\n  }\n\n  private patchObject(data: ObjectValue): ObjectValue {\n    const builder = new ObjectValueBuilder(data);\n    this.fieldMask.fields.forEach(fieldPath => {\n      if (!fieldPath.isEmpty()) {\n        const newValue = this.data.field(fieldPath);\n        if (newValue !== null) {\n          builder.set(fieldPath, newValue);\n        } else {\n          builder.delete(fieldPath);\n        }\n      }\n    });\n    return builder.build();\n  }\n}\n\n/**\n * A mutation that modifies specific fields of the document with transform\n * operations. Currently the only supported transform is a server timestamp, but\n * IP Address, increment(n), etc. could be supported in the future.\n *\n * It is somewhat similar to a PatchMutation in that it patches specific fields\n * and has no effect when applied to a null or NoDocument (see comment on\n * Mutation for rationale).\n */\nexport class TransformMutation extends Mutation {\n  readonly type: MutationType = MutationType.Transform;\n\n  // NOTE: We set a precondition of exists: true as a safety-check, since we\n  // always combine TransformMutations with a SetMutation or PatchMutation which\n  // (if successful) should end up with an existing document.\n  readonly precondition = Precondition.exists(true);\n\n  constructor(\n    readonly key: DocumentKey,\n    readonly fieldTransforms: FieldTransform[]\n  ) {\n    super();\n  }\n\n  applyToRemoteDocument(\n    maybeDoc: MaybeDocument | null,\n    mutationResult: MutationResult\n  ): MaybeDocument {\n    this.verifyKeyMatches(maybeDoc);\n\n    hardAssert(\n      mutationResult.transformResults != null,\n      'Transform results missing for TransformMutation.'\n    );\n\n    if (!this.precondition.isValidFor(maybeDoc)) {\n      // Since the mutation was not rejected, we know that the  precondition\n      // matched on the backend. We therefore must not have the expected version\n      // of the document in our cache and return an UnknownDocument with the\n      // known updateTime.\n      return new UnknownDocument(this.key, mutationResult.version);\n    }\n\n    const doc = this.requireDocument(maybeDoc);\n    const transformResults = this.serverTransformResults(\n      maybeDoc,\n      mutationResult.transformResults!\n    );\n\n    const version = mutationResult.version;\n    const newData = this.transformObject(doc.data(), transformResults);\n    return new Document(this.key, version, newData, {\n      hasCommittedMutations: true\n    });\n  }\n\n  applyToLocalView(\n    maybeDoc: MaybeDocument | null,\n    baseDoc: MaybeDocument | null,\n    localWriteTime: Timestamp\n  ): MaybeDocument | null {\n    this.verifyKeyMatches(maybeDoc);\n\n    if (!this.precondition.isValidFor(maybeDoc)) {\n      return maybeDoc;\n    }\n\n    const doc = this.requireDocument(maybeDoc);\n    const transformResults = this.localTransformResults(\n      localWriteTime,\n      maybeDoc,\n      baseDoc\n    );\n    const newData = this.transformObject(doc.data(), transformResults);\n    return new Document(this.key, doc.version, newData, {\n      hasLocalMutations: true\n    });\n  }\n\n  extractBaseValue(maybeDoc: MaybeDocument | null): ObjectValue | null {\n    let baseObject: ObjectValueBuilder | null = null;\n    for (const fieldTransform of this.fieldTransforms) {\n      const existingValue =\n        maybeDoc instanceof Document\n          ? maybeDoc.field(fieldTransform.field)\n          : undefined;\n      const coercedValue = fieldTransform.transform.computeBaseValue(\n        existingValue || null\n      );\n\n      if (coercedValue != null) {\n        if (baseObject == null) {\n          baseObject = new ObjectValueBuilder().set(\n            fieldTransform.field,\n            coercedValue\n          );\n        } else {\n          baseObject = baseObject.set(fieldTransform.field, coercedValue);\n        }\n      }\n    }\n    return baseObject ? baseObject.build() : null;\n  }\n\n  isEqual(other: Mutation): boolean {\n    return (\n      other instanceof TransformMutation &&\n      this.key.isEqual(other.key) &&\n      arrayEquals(this.fieldTransforms, other.fieldTransforms, (l, r) =>\n        l.isEqual(r)\n      ) &&\n      this.precondition.isEqual(other.precondition)\n    );\n  }\n\n  /**\n   * Asserts that the given MaybeDocument is actually a Document and verifies\n   * that it matches the key for this mutation. Since we only support\n   * transformations with precondition exists this method is guaranteed to be\n   * safe.\n   */\n  private requireDocument(maybeDoc: MaybeDocument | null): Document {\n    debugAssert(\n      maybeDoc instanceof Document,\n      'Unknown MaybeDocument type ' + maybeDoc\n    );\n    debugAssert(\n      maybeDoc.key.isEqual(this.key),\n      'Can only transform a document with the same key'\n    );\n    return maybeDoc;\n  }\n\n  /**\n   * Creates a list of \"transform results\" (a transform result is a field value\n   * representing the result of applying a transform) for use after a\n   * TransformMutation has been acknowledged by the server.\n   *\n   * @param baseDoc The document prior to applying this mutation batch.\n   * @param serverTransformResults The transform results received by the server.\n   * @return The transform results list.\n   */\n  private serverTransformResults(\n    baseDoc: MaybeDocument | null,\n    serverTransformResults: Array<api.Value | null>\n  ): api.Value[] {\n    const transformResults: api.Value[] = [];\n    hardAssert(\n      this.fieldTransforms.length === serverTransformResults.length,\n      `server transform result count (${serverTransformResults.length}) ` +\n        `should match field transform count (${this.fieldTransforms.length})`\n    );\n\n    for (let i = 0; i < serverTransformResults.length; i++) {\n      const fieldTransform = this.fieldTransforms[i];\n      const transform = fieldTransform.transform;\n      let previousValue: api.Value | null = null;\n      if (baseDoc instanceof Document) {\n        previousValue = baseDoc.field(fieldTransform.field);\n      }\n      transformResults.push(\n        transform.applyToRemoteDocument(\n          previousValue,\n          serverTransformResults[i]\n        )\n      );\n    }\n    return transformResults;\n  }\n\n  /**\n   * Creates a list of \"transform results\" (a transform result is a field value\n   * representing the result of applying a transform) for use when applying a\n   * TransformMutation locally.\n   *\n   * @param localWriteTime The local time of the transform mutation (used to\n   *     generate ServerTimestampValues).\n   * @param maybeDoc The current state of the document after applying all\n   *     previous mutations.\n   * @param baseDoc The document prior to applying this mutation batch.\n   * @return The transform results list.\n   */\n  private localTransformResults(\n    localWriteTime: Timestamp,\n    maybeDoc: MaybeDocument | null,\n    baseDoc: MaybeDocument | null\n  ): api.Value[] {\n    const transformResults: api.Value[] = [];\n    for (const fieldTransform of this.fieldTransforms) {\n      const transform = fieldTransform.transform;\n\n      let previousValue: api.Value | null = null;\n      if (maybeDoc instanceof Document) {\n        previousValue = maybeDoc.field(fieldTransform.field);\n      }\n\n      if (previousValue === null && baseDoc instanceof Document) {\n        // If the current document does not contain a value for the mutated\n        // field, use the value that existed before applying this mutation\n        // batch. This solves an edge case where a PatchMutation clears the\n        // values in a nested map before the TransformMutation is applied.\n        previousValue = baseDoc.field(fieldTransform.field);\n      }\n\n      transformResults.push(\n        transform.applyToLocalView(previousValue, localWriteTime)\n      );\n    }\n    return transformResults;\n  }\n\n  private transformObject(\n    data: ObjectValue,\n    transformResults: api.Value[]\n  ): ObjectValue {\n    debugAssert(\n      transformResults.length === this.fieldTransforms.length,\n      'TransformResults length mismatch.'\n    );\n\n    const builder = new ObjectValueBuilder(data);\n    for (let i = 0; i < this.fieldTransforms.length; i++) {\n      const fieldTransform = this.fieldTransforms[i];\n      const fieldPath = fieldTransform.field;\n      builder.set(fieldPath, transformResults[i]);\n    }\n    return builder.build();\n  }\n}\n\n/** A mutation that deletes the document at the given key. */\nexport class DeleteMutation extends Mutation {\n  constructor(readonly key: DocumentKey, readonly precondition: Precondition) {\n    super();\n  }\n\n  readonly type: MutationType = MutationType.Delete;\n\n  applyToRemoteDocument(\n    maybeDoc: MaybeDocument | null,\n    mutationResult: MutationResult\n  ): MaybeDocument {\n    this.verifyKeyMatches(maybeDoc);\n\n    debugAssert(\n      mutationResult.transformResults == null,\n      'Transform results received by DeleteMutation.'\n    );\n\n    // Unlike applyToLocalView, if we're applying a mutation to a remote\n    // document the server has accepted the mutation so the precondition must\n    // have held.\n\n    return new NoDocument(this.key, mutationResult.version, {\n      hasCommittedMutations: true\n    });\n  }\n\n  applyToLocalView(\n    maybeDoc: MaybeDocument | null,\n    baseDoc: MaybeDocument | null,\n    localWriteTime: Timestamp\n  ): MaybeDocument | null {\n    this.verifyKeyMatches(maybeDoc);\n\n    if (!this.precondition.isValidFor(maybeDoc)) {\n      return maybeDoc;\n    }\n\n    if (maybeDoc) {\n      debugAssert(\n        maybeDoc.key.isEqual(this.key),\n        'Can only apply mutation to document with same key'\n      );\n    }\n    return new NoDocument(this.key, SnapshotVersion.min());\n  }\n\n  extractBaseValue(maybeDoc: MaybeDocument | null): null {\n    return null;\n  }\n\n  isEqual(other: Mutation): boolean {\n    return (\n      other instanceof DeleteMutation &&\n      this.key.isEqual(other.key) &&\n      this.precondition.isEqual(other.precondition)\n    );\n  }\n}\n\n/**\n * A mutation that verifies the existence of the document at the given key with\n * the provided precondition.\n *\n * The `verify` operation is only used in Transactions, and this class serves\n * primarily to facilitate serialization into protos.\n */\nexport class VerifyMutation extends Mutation {\n  constructor(readonly key: DocumentKey, readonly precondition: Precondition) {\n    super();\n  }\n\n  readonly type: MutationType = MutationType.Verify;\n\n  applyToRemoteDocument(\n    maybeDoc: MaybeDocument | null,\n    mutationResult: MutationResult\n  ): MaybeDocument {\n    fail('VerifyMutation should only be used in Transactions.');\n  }\n\n  applyToLocalView(\n    maybeDoc: MaybeDocument | null,\n    baseDoc: MaybeDocument | null,\n    localWriteTime: Timestamp\n  ): MaybeDocument | null {\n    fail('VerifyMutation should only be used in Transactions.');\n  }\n\n  extractBaseValue(maybeDoc: MaybeDocument | null): null {\n    fail('VerifyMutation should only be used in Transactions.');\n  }\n\n  isEqual(other: Mutation): boolean {\n    return (\n      other instanceof VerifyMutation &&\n      this.key.isEqual(other.key) &&\n      this.precondition.isEqual(other.precondition)\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { debugAssert } from '../util/assert';\nimport { FieldMask } from './mutation';\nimport { FieldPath } from './path';\nimport { isServerTimestamp } from './server_timestamps';\nimport { valueEquals, isMapValue, typeOrder } from './values';\nimport { forEach } from '../util/obj';\n\nexport interface JsonObject<T> {\n  [name: string]: T;\n}\n\nexport const enum TypeOrder {\n  // This order is based on the backend's ordering, but modified to support\n  // server timestamps.\n  NullValue = 0,\n  BooleanValue = 1,\n  NumberValue = 2,\n  TimestampValue = 3,\n  ServerTimestampValue = 4,\n  StringValue = 5,\n  BlobValue = 6,\n  RefValue = 7,\n  GeoPointValue = 8,\n  ArrayValue = 9,\n  ObjectValue = 10\n}\n\n/**\n * An ObjectValue represents a MapValue in the Firestore Proto and offers the\n * ability to add and remove fields (via the ObjectValueBuilder).\n */\nexport class ObjectValue {\n  constructor(public readonly proto: { mapValue: api.MapValue }) {\n    debugAssert(\n      !isServerTimestamp(proto),\n      'ServerTimestamps should be converted to ServerTimestampValue'\n    );\n  }\n\n  static empty(): ObjectValue {\n    return new ObjectValue({ mapValue: {} });\n  }\n\n  /**\n   * Returns the value at the given path or null.\n   *\n   * @param path the path to search\n   * @return The value at the path or if there it doesn't exist.\n   */\n  field(path: FieldPath): api.Value | null {\n    if (path.isEmpty()) {\n      return this.proto;\n    } else {\n      let value: api.Value = this.proto;\n      for (let i = 0; i < path.length - 1; ++i) {\n        if (!value.mapValue!.fields) {\n          return null;\n        }\n        value = value.mapValue!.fields[path.get(i)];\n        if (!isMapValue(value)) {\n          return null;\n        }\n      }\n\n      value = (value.mapValue!.fields || {})[path.lastSegment()];\n      return value || null;\n    }\n  }\n\n  isEqual(other: ObjectValue): boolean {\n    return valueEquals(this.proto, other.proto);\n  }\n}\n\n/**\n * An Overlay, which contains an update to apply. Can either be Value proto, a\n * map of Overlay values (to represent additional nesting at the given key) or\n * `null` (to represent field deletes).\n */\ntype Overlay = Map<string, Overlay> | api.Value | null;\n\n/**\n * An ObjectValueBuilder provides APIs to set and delete fields from an\n * ObjectValue.\n */\nexport class ObjectValueBuilder {\n  /** A map that contains the accumulated changes in this builder. */\n  private overlayMap = new Map<string, Overlay>();\n\n  /**\n   * @param baseObject The object to mutate.\n   */\n  constructor(private readonly baseObject: ObjectValue = ObjectValue.empty()) {}\n\n  /**\n   * Sets the field to the provided value.\n   *\n   * @param path The field path to set.\n   * @param value The value to set.\n   * @return The current Builder instance.\n   */\n  set(path: FieldPath, value: api.Value): ObjectValueBuilder {\n    debugAssert(\n      !path.isEmpty(),\n      'Cannot set field for empty path on ObjectValue'\n    );\n    this.setOverlay(path, value);\n    return this;\n  }\n\n  /**\n   * Removes the field at the specified path. If there is no field at the\n   * specified path, nothing is changed.\n   *\n   * @param path The field path to remove.\n   * @return The current Builder instance.\n   */\n  delete(path: FieldPath): ObjectValueBuilder {\n    debugAssert(\n      !path.isEmpty(),\n      'Cannot delete field for empty path on ObjectValue'\n    );\n    this.setOverlay(path, null);\n    return this;\n  }\n\n  /**\n   * Adds `value` to the overlay map at `path`. Creates nested map entries if\n   * needed.\n   */\n  private setOverlay(path: FieldPath, value: api.Value | null): void {\n    let currentLevel = this.overlayMap;\n\n    for (let i = 0; i < path.length - 1; ++i) {\n      const currentSegment = path.get(i);\n      let currentValue = currentLevel.get(currentSegment);\n\n      if (currentValue instanceof Map) {\n        // Re-use a previously created map\n        currentLevel = currentValue;\n      } else if (\n        currentValue &&\n        typeOrder(currentValue) === TypeOrder.ObjectValue\n      ) {\n        // Convert the existing Protobuf MapValue into a map\n        currentValue = new Map<string, Overlay>(\n          Object.entries(currentValue.mapValue!.fields || {})\n        );\n        currentLevel.set(currentSegment, currentValue);\n        currentLevel = currentValue;\n      } else {\n        // Create an empty map to represent the current nesting level\n        currentValue = new Map<string, Overlay>();\n        currentLevel.set(currentSegment, currentValue);\n        currentLevel = currentValue;\n      }\n    }\n\n    currentLevel.set(path.lastSegment(), value);\n  }\n\n  /** Returns an ObjectValue with all mutations applied. */\n  build(): ObjectValue {\n    const mergedResult = this.applyOverlay(\n      FieldPath.EMPTY_PATH,\n      this.overlayMap\n    );\n    if (mergedResult != null) {\n      return new ObjectValue(mergedResult);\n    } else {\n      return this.baseObject;\n    }\n  }\n\n  /**\n   * Applies any overlays from `currentOverlays` that exist at `currentPath`\n   * and returns the merged data at `currentPath` (or null if there were no\n   * changes).\n   *\n   * @param currentPath The path at the current nesting level. Can be set to\n   * FieldValue.EMPTY_PATH to represent the root.\n   * @param currentOverlays The overlays at the current nesting level in the\n   * same format as `overlayMap`.\n   * @return The merged data at `currentPath` or null if no modifications\n   * were applied.\n   */\n  private applyOverlay(\n    currentPath: FieldPath,\n    currentOverlays: Map<string, Overlay>\n  ): { mapValue: api.MapValue } | null {\n    let modified = false;\n\n    const existingValue = this.baseObject.field(currentPath);\n    const resultAtPath = isMapValue(existingValue)\n      ? // If there is already data at the current path, base our\n        // modifications on top of the existing data.\n        { ...existingValue.mapValue.fields }\n      : {};\n\n    currentOverlays.forEach((value, pathSegment) => {\n      if (value instanceof Map) {\n        const nested = this.applyOverlay(currentPath.child(pathSegment), value);\n        if (nested != null) {\n          resultAtPath[pathSegment] = nested;\n          modified = true;\n        }\n      } else if (value !== null) {\n        resultAtPath[pathSegment] = value;\n        modified = true;\n      } else if (resultAtPath.hasOwnProperty(pathSegment)) {\n        delete resultAtPath[pathSegment];\n        modified = true;\n      }\n    });\n\n    return modified ? { mapValue: { fields: resultAtPath } } : null;\n  }\n}\n\n/**\n * Returns a FieldMask built from all fields in a MapValue.\n */\nexport function extractFieldMask(value: api.MapValue): FieldMask {\n  const fields: FieldPath[] = [];\n  forEach(value!.fields || {}, (key, value) => {\n    const currentPath = new FieldPath([key]);\n    if (isMapValue(value)) {\n      const nestedMask = extractFieldMask(value.mapValue!);\n      const nestedFields = nestedMask.fields;\n      if (nestedFields.length === 0) {\n        // Preserve the empty map by adding it to the FieldMask.\n        fields.push(currentPath);\n      } else {\n        // For nested and non-empty ObjectValues, add the FieldPath of the\n        // leaf nodes.\n        for (const nestedPath of nestedFields) {\n          fields.push(currentPath.child(nestedPath));\n        }\n      }\n    } else {\n      // For nested and non-empty ObjectValues, add the FieldPath of the leaf\n      // nodes.\n      fields.push(currentPath);\n    }\n  });\n  return new FieldMask(fields);\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { fail } from '../util/assert';\n\nimport { DocumentKey } from './document_key';\nimport { ObjectValue } from './object_value';\nimport { FieldPath } from './path';\nimport { valueCompare } from './values';\n\nexport interface DocumentOptions {\n  hasLocalMutations?: boolean;\n  hasCommittedMutations?: boolean;\n}\n\n/**\n * The result of a lookup for a given path may be an existing document or a\n * marker that this document does not exist at a given version.\n */\nexport abstract class MaybeDocument {\n  constructor(readonly key: DocumentKey, readonly version: SnapshotVersion) {}\n\n  /**\n   * Whether this document had a local mutation applied that has not yet been\n   * acknowledged by Watch.\n   */\n  abstract get hasPendingWrites(): boolean;\n\n  abstract isEqual(other: MaybeDocument | null | undefined): boolean;\n\n  abstract toString(): string;\n}\n\n/**\n * Represents a document in Firestore with a key, version, data and whether the\n * data has local mutations applied to it.\n */\nexport class Document extends MaybeDocument {\n  readonly hasLocalMutations: boolean;\n  readonly hasCommittedMutations: boolean;\n\n  constructor(\n    key: DocumentKey,\n    version: SnapshotVersion,\n    private readonly objectValue: ObjectValue,\n    options: DocumentOptions\n  ) {\n    super(key, version);\n    this.hasLocalMutations = !!options.hasLocalMutations;\n    this.hasCommittedMutations = !!options.hasCommittedMutations;\n  }\n\n  field(path: FieldPath): api.Value | null {\n    return this.objectValue.field(path);\n  }\n\n  data(): ObjectValue {\n    return this.objectValue;\n  }\n\n  toProto(): { mapValue: api.MapValue } {\n    return this.objectValue.proto;\n  }\n\n  isEqual(other: MaybeDocument | null | undefined): boolean {\n    return (\n      other instanceof Document &&\n      this.key.isEqual(other.key) &&\n      this.version.isEqual(other.version) &&\n      this.hasLocalMutations === other.hasLocalMutations &&\n      this.hasCommittedMutations === other.hasCommittedMutations &&\n      this.objectValue.isEqual(other.objectValue)\n    );\n  }\n\n  toString(): string {\n    return (\n      `Document(${this.key}, ${\n        this.version\n      }, ${this.objectValue.toString()}, ` +\n      `{hasLocalMutations: ${this.hasLocalMutations}}), ` +\n      `{hasCommittedMutations: ${this.hasCommittedMutations}})`\n    );\n  }\n\n  get hasPendingWrites(): boolean {\n    return this.hasLocalMutations || this.hasCommittedMutations;\n  }\n}\n\n/**\n * Compares the value for field `field` in the provided documents. Throws if\n * the field does not exist in both documents.\n */\nexport function compareDocumentsByField(\n  field: FieldPath,\n  d1: Document,\n  d2: Document\n): number {\n  const v1 = d1.field(field);\n  const v2 = d2.field(field);\n  if (v1 !== null && v2 !== null) {\n    return valueCompare(v1, v2);\n  } else {\n    return fail(\"Trying to compare documents on fields that don't exist\");\n  }\n}\n\n/**\n * A class representing a deleted document.\n * Version is set to 0 if we don't point to any specific time, otherwise it\n * denotes time we know it didn't exist at.\n */\nexport class NoDocument extends MaybeDocument {\n  readonly hasCommittedMutations: boolean;\n\n  constructor(\n    key: DocumentKey,\n    version: SnapshotVersion,\n    options?: DocumentOptions\n  ) {\n    super(key, version);\n    this.hasCommittedMutations = !!(options && options.hasCommittedMutations);\n  }\n\n  toString(): string {\n    return `NoDocument(${this.key}, ${this.version})`;\n  }\n\n  get hasPendingWrites(): boolean {\n    return this.hasCommittedMutations;\n  }\n\n  isEqual(other: MaybeDocument | null | undefined): boolean {\n    return (\n      other instanceof NoDocument &&\n      other.hasCommittedMutations === this.hasCommittedMutations &&\n      other.version.isEqual(this.version) &&\n      other.key.isEqual(this.key)\n    );\n  }\n}\n\n/**\n * A class representing an existing document whose data is unknown (e.g. a\n * document that was updated without a known base document).\n */\nexport class UnknownDocument extends MaybeDocument {\n  toString(): string {\n    return `UnknownDocument(${this.key}, ${this.version})`;\n  }\n\n  get hasPendingWrites(): boolean {\n    return true;\n  }\n\n  isEqual(other: MaybeDocument | null | undefined): boolean {\n    return (\n      other instanceof UnknownDocument &&\n      other.version.isEqual(this.version) &&\n      other.key.isEqual(this.key)\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nexport class ExistenceFilter {\n  // TODO(b/33078163): just use simplest form of existence filter for now\n  constructor(public count: number) {}\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { fail } from '../util/assert';\nimport { Code } from '../util/error';\nimport { logError } from '../util/log';\n\n/**\n * Error Codes describing the different ways GRPC can fail. These are copied\n * directly from GRPC's sources here:\n *\n * https://github.com/grpc/grpc/blob/bceec94ea4fc5f0085d81235d8e1c06798dc341a/include/grpc%2B%2B/impl/codegen/status_code_enum.h\n *\n * Important! The names of these identifiers matter because the string forms\n * are used for reverse lookups from the webchannel stream. Do NOT change the\n * names of these identifiers or change this into a const enum.\n */\nenum RpcCode {\n  OK = 0,\n  CANCELLED = 1,\n  UNKNOWN = 2,\n  INVALID_ARGUMENT = 3,\n  DEADLINE_EXCEEDED = 4,\n  NOT_FOUND = 5,\n  ALREADY_EXISTS = 6,\n  PERMISSION_DENIED = 7,\n  UNAUTHENTICATED = 16,\n  RESOURCE_EXHAUSTED = 8,\n  FAILED_PRECONDITION = 9,\n  ABORTED = 10,\n  OUT_OF_RANGE = 11,\n  UNIMPLEMENTED = 12,\n  INTERNAL = 13,\n  UNAVAILABLE = 14,\n  DATA_LOSS = 15\n}\n\n/**\n * Determines whether an error code represents a permanent error when received\n * in response to a non-write operation.\n *\n * See isPermanentWriteError for classifying write errors.\n */\nexport function isPermanentError(code: Code): boolean {\n  switch (code) {\n    case Code.OK:\n      return fail('Treated status OK as error');\n    case Code.CANCELLED:\n    case Code.UNKNOWN:\n    case Code.DEADLINE_EXCEEDED:\n    case Code.RESOURCE_EXHAUSTED:\n    case Code.INTERNAL:\n    case Code.UNAVAILABLE:\n    // Unauthenticated means something went wrong with our token and we need\n    // to retry with new credentials which will happen automatically.\n    case Code.UNAUTHENTICATED:\n      return false;\n    case Code.INVALID_ARGUMENT:\n    case Code.NOT_FOUND:\n    case Code.ALREADY_EXISTS:\n    case Code.PERMISSION_DENIED:\n    case Code.FAILED_PRECONDITION:\n    // Aborted might be retried in some scenarios, but that is dependant on\n    // the context and should handled individually by the calling code.\n    // See https://cloud.google.com/apis/design/errors.\n    case Code.ABORTED:\n    case Code.OUT_OF_RANGE:\n    case Code.UNIMPLEMENTED:\n    case Code.DATA_LOSS:\n      return true;\n    default:\n      return fail('Unknown status code: ' + code);\n  }\n}\n\n/**\n * Determines whether an error code represents a permanent error when received\n * in response to a write operation.\n *\n * Write operations must be handled specially because as of b/119437764, ABORTED\n * errors on the write stream should be retried too (even though ABORTED errors\n * are not generally retryable).\n *\n * Note that during the initial handshake on the write stream an ABORTED error\n * signals that we should discard our stream token (i.e. it is permanent). This\n * means a handshake error should be classified with isPermanentError, above.\n */\nexport function isPermanentWriteError(code: Code): boolean {\n  return isPermanentError(code) && code !== Code.ABORTED;\n}\n\n/**\n * Maps an error Code from a GRPC status identifier like 'NOT_FOUND'.\n *\n * @returns The Code equivalent to the given status string or undefined if\n *     there is no match.\n */\nexport function mapCodeFromRpcStatus(status: string): Code | undefined {\n  // lookup by string\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  const code: RpcCode = RpcCode[status as any] as any;\n  if (code === undefined) {\n    return undefined;\n  }\n\n  return mapCodeFromRpcCode(code);\n}\n\n/**\n * Maps an error Code from GRPC status code number, like 0, 1, or 14. These\n * are not the same as HTTP status codes.\n *\n * @returns The Code equivalent to the given GRPC status code. Fails if there\n *     is no match.\n */\nexport function mapCodeFromRpcCode(code: number | undefined): Code {\n  if (code === undefined) {\n    // This shouldn't normally happen, but in certain error cases (like trying\n    // to send invalid proto messages) we may get an error with no GRPC code.\n    logError('GRPC error has no .code');\n    return Code.UNKNOWN;\n  }\n\n  switch (code) {\n    case RpcCode.OK:\n      return Code.OK;\n    case RpcCode.CANCELLED:\n      return Code.CANCELLED;\n    case RpcCode.UNKNOWN:\n      return Code.UNKNOWN;\n    case RpcCode.DEADLINE_EXCEEDED:\n      return Code.DEADLINE_EXCEEDED;\n    case RpcCode.RESOURCE_EXHAUSTED:\n      return Code.RESOURCE_EXHAUSTED;\n    case RpcCode.INTERNAL:\n      return Code.INTERNAL;\n    case RpcCode.UNAVAILABLE:\n      return Code.UNAVAILABLE;\n    case RpcCode.UNAUTHENTICATED:\n      return Code.UNAUTHENTICATED;\n    case RpcCode.INVALID_ARGUMENT:\n      return Code.INVALID_ARGUMENT;\n    case RpcCode.NOT_FOUND:\n      return Code.NOT_FOUND;\n    case RpcCode.ALREADY_EXISTS:\n      return Code.ALREADY_EXISTS;\n    case RpcCode.PERMISSION_DENIED:\n      return Code.PERMISSION_DENIED;\n    case RpcCode.FAILED_PRECONDITION:\n      return Code.FAILED_PRECONDITION;\n    case RpcCode.ABORTED:\n      return Code.ABORTED;\n    case RpcCode.OUT_OF_RANGE:\n      return Code.OUT_OF_RANGE;\n    case RpcCode.UNIMPLEMENTED:\n      return Code.UNIMPLEMENTED;\n    case RpcCode.DATA_LOSS:\n      return Code.DATA_LOSS;\n    default:\n      return fail('Unknown status code: ' + code);\n  }\n}\n\n/**\n * Maps an RPC code from a Code. This is the reverse operation from\n * mapCodeFromRpcCode and should really only be used in tests.\n */\nexport function mapRpcCodeFromCode(code: Code | undefined): number {\n  if (code === undefined) {\n    return RpcCode.OK;\n  }\n\n  switch (code) {\n    case Code.OK:\n      return RpcCode.OK;\n    case Code.CANCELLED:\n      return RpcCode.CANCELLED;\n    case Code.UNKNOWN:\n      return RpcCode.UNKNOWN;\n    case Code.DEADLINE_EXCEEDED:\n      return RpcCode.DEADLINE_EXCEEDED;\n    case Code.RESOURCE_EXHAUSTED:\n      return RpcCode.RESOURCE_EXHAUSTED;\n    case Code.INTERNAL:\n      return RpcCode.INTERNAL;\n    case Code.UNAVAILABLE:\n      return RpcCode.UNAVAILABLE;\n    case Code.UNAUTHENTICATED:\n      return RpcCode.UNAUTHENTICATED;\n    case Code.INVALID_ARGUMENT:\n      return RpcCode.INVALID_ARGUMENT;\n    case Code.NOT_FOUND:\n      return RpcCode.NOT_FOUND;\n    case Code.ALREADY_EXISTS:\n      return RpcCode.ALREADY_EXISTS;\n    case Code.PERMISSION_DENIED:\n      return RpcCode.PERMISSION_DENIED;\n    case Code.FAILED_PRECONDITION:\n      return RpcCode.FAILED_PRECONDITION;\n    case Code.ABORTED:\n      return RpcCode.ABORTED;\n    case Code.OUT_OF_RANGE:\n      return RpcCode.OUT_OF_RANGE;\n    case Code.UNIMPLEMENTED:\n      return RpcCode.UNIMPLEMENTED;\n    case Code.DATA_LOSS:\n      return RpcCode.DATA_LOSS;\n    default:\n      return fail('Unknown status code: ' + code);\n  }\n}\n\n/**\n * Converts an HTTP Status Code to the equivalent error code.\n *\n * @param status An HTTP Status Code, like 200, 404, 503, etc.\n * @returns The equivalent Code. Unknown status codes are mapped to\n *     Code.UNKNOWN.\n */\nexport function mapCodeFromHttpStatus(status: number): Code {\n  // The canonical error codes for Google APIs [1] specify mapping onto HTTP\n  // status codes but the mapping is not bijective. In each case of ambiguity\n  // this function chooses a primary error.\n  //\n  // [1]\n  // https://github.com/googleapis/googleapis/blob/master/google/rpc/code.proto\n  switch (status) {\n    case 200: // OK\n      return Code.OK;\n\n    case 400: // Bad Request\n      return Code.INVALID_ARGUMENT;\n    // Other possibilities based on the forward mapping\n    // return Code.FAILED_PRECONDITION;\n    // return Code.OUT_OF_RANGE;\n\n    case 401: // Unauthorized\n      return Code.UNAUTHENTICATED;\n\n    case 403: // Forbidden\n      return Code.PERMISSION_DENIED;\n\n    case 404: // Not Found\n      return Code.NOT_FOUND;\n\n    case 409: // Conflict\n      return Code.ABORTED;\n    // Other possibilities:\n    // return Code.ALREADY_EXISTS;\n\n    case 416: // Range Not Satisfiable\n      return Code.OUT_OF_RANGE;\n\n    case 429: // Too Many Requests\n      return Code.RESOURCE_EXHAUSTED;\n\n    case 499: // Client Closed Request\n      return Code.CANCELLED;\n\n    case 500: // Internal Server Error\n      return Code.UNKNOWN;\n    // Other possibilities:\n    // return Code.INTERNAL;\n    // return Code.DATA_LOSS;\n\n    case 501: // Unimplemented\n      return Code.UNIMPLEMENTED;\n\n    case 503: // Service Unavailable\n      return Code.UNAVAILABLE;\n\n    case 504: // Gateway Timeout\n      return Code.DEADLINE_EXCEEDED;\n\n    default:\n      if (status >= 200 && status < 300) {\n        return Code.OK;\n      }\n      if (status >= 400 && status < 500) {\n        return Code.FAILED_PRECONDITION;\n      }\n      if (status >= 500 && status < 600) {\n        return Code.INTERNAL;\n      }\n      return Code.UNKNOWN;\n  }\n}\n\n/**\n * Converts an HTTP response's error status to the equivalent error code.\n *\n * @param status An HTTP error response status (\"FAILED_PRECONDITION\",\n * \"UNKNOWN\", etc.)\n * @returns The equivalent Code. Non-matching responses are mapped to\n *     Code.UNKNOWN.\n */\nexport function mapCodeFromHttpResponseErrorStatus(status: string): Code {\n  const serverError = status.toLowerCase().replace('_', '-');\n  return Object.values(Code).indexOf(serverError as Code) >= 0\n    ? (serverError as Code)\n    : Code.UNKNOWN;\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { DocumentKey } from '../model/document_key';\nimport { ResourcePath } from '../model/path';\nimport { isNullOrUndefined } from '../util/types';\nimport { Bound, Filter, OrderBy } from './query';\n\n/**\n * A Target represents the WatchTarget representation of a Query, which is used\n * by the LocalStore and the RemoteStore to keep track of and to execute\n * backend queries. While a Query can represent multiple Targets, each Targets\n * maps to a single WatchTarget in RemoteStore and a single TargetData entry\n * in persistence.\n */\nexport class Target {\n  private memoizedCanonicalId: string | null = null;\n\n  /**\n   * Initializes a Target with a path and optional additional query constraints.\n   * Path must currently be empty if this is a collection group query.\n   *\n   * NOTE: you should always construct `Target` from `Query.toTarget` instead of\n   * using this constructor, because `Query` provides an implicit `orderBy`\n   * property.\n   */\n  constructor(\n    readonly path: ResourcePath,\n    readonly collectionGroup: string | null = null,\n    readonly orderBy: OrderBy[] = [],\n    readonly filters: Filter[] = [],\n    readonly limit: number | null = null,\n    readonly startAt: Bound | null = null,\n    readonly endAt: Bound | null = null\n  ) {}\n\n  canonicalId(): string {\n    if (this.memoizedCanonicalId === null) {\n      let canonicalId = this.path.canonicalString();\n      if (this.collectionGroup !== null) {\n        canonicalId += '|cg:' + this.collectionGroup;\n      }\n      canonicalId += '|f:';\n      canonicalId += this.filters.map(f => f.canonicalId()).join(',');\n      canonicalId += '|ob:';\n      canonicalId += this.orderBy.map(o => o.canonicalId()).join(',');\n\n      if (!isNullOrUndefined(this.limit)) {\n        canonicalId += '|l:';\n        canonicalId += this.limit!;\n      }\n      if (this.startAt) {\n        canonicalId += '|lb:';\n        canonicalId += this.startAt.canonicalId();\n      }\n      if (this.endAt) {\n        canonicalId += '|ub:';\n        canonicalId += this.endAt.canonicalId();\n      }\n      this.memoizedCanonicalId = canonicalId;\n    }\n    return this.memoizedCanonicalId;\n  }\n\n  toString(): string {\n    let str = this.path.canonicalString();\n    if (this.collectionGroup !== null) {\n      str += ' collectionGroup=' + this.collectionGroup;\n    }\n    if (this.filters.length > 0) {\n      str += `, filters: [${this.filters.join(', ')}]`;\n    }\n    if (!isNullOrUndefined(this.limit)) {\n      str += ', limit: ' + this.limit;\n    }\n    if (this.orderBy.length > 0) {\n      str += `, orderBy: [${this.orderBy.join(', ')}]`;\n    }\n    if (this.startAt) {\n      str += ', startAt: ' + this.startAt.canonicalId();\n    }\n    if (this.endAt) {\n      str += ', endAt: ' + this.endAt.canonicalId();\n    }\n    return `Target(${str})`;\n  }\n\n  isEqual(other: Target): boolean {\n    if (this.limit !== other.limit) {\n      return false;\n    }\n\n    if (this.orderBy.length !== other.orderBy.length) {\n      return false;\n    }\n\n    for (let i = 0; i < this.orderBy.length; i++) {\n      if (!this.orderBy[i].isEqual(other.orderBy[i])) {\n        return false;\n      }\n    }\n\n    if (this.filters.length !== other.filters.length) {\n      return false;\n    }\n\n    for (let i = 0; i < this.filters.length; i++) {\n      if (!this.filters[i].isEqual(other.filters[i])) {\n        return false;\n      }\n    }\n\n    if (this.collectionGroup !== other.collectionGroup) {\n      return false;\n    }\n\n    if (!this.path.isEqual(other.path)) {\n      return false;\n    }\n\n    if (\n      this.startAt !== null\n        ? !this.startAt.isEqual(other.startAt)\n        : other.startAt !== null\n    ) {\n      return false;\n    }\n\n    return this.endAt !== null\n      ? this.endAt.isEqual(other.endAt)\n      : other.endAt === null;\n  }\n\n  isDocumentQuery(): boolean {\n    return (\n      DocumentKey.isDocumentKey(this.path) &&\n      this.collectionGroup === null &&\n      this.filters.length === 0\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { compareDocumentsByField, Document } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport {\n  canonicalId,\n  valueCompare,\n  arrayValueContains,\n  valueEquals,\n  isArray,\n  isNanValue,\n  isNullValue,\n  isReferenceValue,\n  typeOrder\n} from '../model/values';\nimport { FieldPath, ResourcePath } from '../model/path';\nimport { debugAssert, fail } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { isNullOrUndefined } from '../util/types';\nimport { Target } from './target';\n\nexport const enum LimitType {\n  First = 'F',\n  Last = 'L'\n}\n\n/**\n * Query encapsulates all the query attributes we support in the SDK. It can\n * be run against the LocalStore, as well as be converted to a `Target` to\n * query the RemoteStore results.\n */\nexport class Query {\n  static atPath(path: ResourcePath): Query {\n    return new Query(path);\n  }\n\n  private memoizedOrderBy: OrderBy[] | null = null;\n\n  // The corresponding `Target` of this `Query` instance.\n  private memoizedTarget: Target | null = null;\n\n  /**\n   * Initializes a Query with a path and optional additional query constraints.\n   * Path must currently be empty if this is a collection group query.\n   */\n  constructor(\n    readonly path: ResourcePath,\n    readonly collectionGroup: string | null = null,\n    readonly explicitOrderBy: OrderBy[] = [],\n    readonly filters: Filter[] = [],\n    readonly limit: number | null = null,\n    readonly limitType: LimitType = LimitType.First,\n    readonly startAt: Bound | null = null,\n    readonly endAt: Bound | null = null\n  ) {\n    if (this.startAt) {\n      this.assertValidBound(this.startAt);\n    }\n    if (this.endAt) {\n      this.assertValidBound(this.endAt);\n    }\n  }\n\n  get orderBy(): OrderBy[] {\n    if (this.memoizedOrderBy === null) {\n      this.memoizedOrderBy = [];\n\n      const inequalityField = this.getInequalityFilterField();\n      const firstOrderByField = this.getFirstOrderByField();\n      if (inequalityField !== null && firstOrderByField === null) {\n        // In order to implicitly add key ordering, we must also add the\n        // inequality filter field for it to be a valid query.\n        // Note that the default inequality field and key ordering is ascending.\n        if (!inequalityField.isKeyField()) {\n          this.memoizedOrderBy.push(new OrderBy(inequalityField));\n        }\n        this.memoizedOrderBy.push(\n          new OrderBy(FieldPath.keyField(), Direction.ASCENDING)\n        );\n      } else {\n        debugAssert(\n          inequalityField === null ||\n            (firstOrderByField !== null &&\n              inequalityField.isEqual(firstOrderByField)),\n          'First orderBy should match inequality field.'\n        );\n        let foundKeyOrdering = false;\n        for (const orderBy of this.explicitOrderBy) {\n          this.memoizedOrderBy.push(orderBy);\n          if (orderBy.field.isKeyField()) {\n            foundKeyOrdering = true;\n          }\n        }\n        if (!foundKeyOrdering) {\n          // The order of the implicit key ordering always matches the last\n          // explicit order by\n          const lastDirection =\n            this.explicitOrderBy.length > 0\n              ? this.explicitOrderBy[this.explicitOrderBy.length - 1].dir\n              : Direction.ASCENDING;\n          this.memoizedOrderBy.push(\n            new OrderBy(FieldPath.keyField(), lastDirection)\n          );\n        }\n      }\n    }\n    return this.memoizedOrderBy;\n  }\n\n  addFilter(filter: Filter): Query {\n    debugAssert(\n      this.getInequalityFilterField() == null ||\n        !(filter instanceof FieldFilter) ||\n        !filter.isInequality() ||\n        filter.field.isEqual(this.getInequalityFilterField()!),\n      'Query must only have one inequality field.'\n    );\n\n    debugAssert(\n      !this.isDocumentQuery(),\n      'No filtering allowed for document query'\n    );\n\n    const newFilters = this.filters.concat([filter]);\n    return new Query(\n      this.path,\n      this.collectionGroup,\n      this.explicitOrderBy.slice(),\n      newFilters,\n      this.limit,\n      this.limitType,\n      this.startAt,\n      this.endAt\n    );\n  }\n\n  addOrderBy(orderBy: OrderBy): Query {\n    debugAssert(\n      !this.startAt && !this.endAt,\n      'Bounds must be set after orderBy'\n    );\n    // TODO(dimond): validate that orderBy does not list the same key twice.\n    const newOrderBy = this.explicitOrderBy.concat([orderBy]);\n    return new Query(\n      this.path,\n      this.collectionGroup,\n      newOrderBy,\n      this.filters.slice(),\n      this.limit,\n      this.limitType,\n      this.startAt,\n      this.endAt\n    );\n  }\n\n  withLimitToFirst(limit: number | null): Query {\n    return new Query(\n      this.path,\n      this.collectionGroup,\n      this.explicitOrderBy.slice(),\n      this.filters.slice(),\n      limit,\n      LimitType.First,\n      this.startAt,\n      this.endAt\n    );\n  }\n\n  withLimitToLast(limit: number | null): Query {\n    return new Query(\n      this.path,\n      this.collectionGroup,\n      this.explicitOrderBy.slice(),\n      this.filters.slice(),\n      limit,\n      LimitType.Last,\n      this.startAt,\n      this.endAt\n    );\n  }\n\n  withStartAt(bound: Bound): Query {\n    return new Query(\n      this.path,\n      this.collectionGroup,\n      this.explicitOrderBy.slice(),\n      this.filters.slice(),\n      this.limit,\n      this.limitType,\n      bound,\n      this.endAt\n    );\n  }\n\n  withEndAt(bound: Bound): Query {\n    return new Query(\n      this.path,\n      this.collectionGroup,\n      this.explicitOrderBy.slice(),\n      this.filters.slice(),\n      this.limit,\n      this.limitType,\n      this.startAt,\n      bound\n    );\n  }\n\n  /**\n   * Helper to convert a collection group query into a collection query at a\n   * specific path. This is used when executing collection group queries, since\n   * we have to split the query into a set of collection queries at multiple\n   * paths.\n   */\n  asCollectionQueryAtPath(path: ResourcePath): Query {\n    return new Query(\n      path,\n      /*collectionGroup=*/ null,\n      this.explicitOrderBy.slice(),\n      this.filters.slice(),\n      this.limit,\n      this.limitType,\n      this.startAt,\n      this.endAt\n    );\n  }\n\n  /**\n   * Returns true if this query does not specify any query constraints that\n   * could remove results.\n   */\n  matchesAllDocuments(): boolean {\n    return (\n      this.filters.length === 0 &&\n      this.limit === null &&\n      this.startAt == null &&\n      this.endAt == null &&\n      (this.explicitOrderBy.length === 0 ||\n        (this.explicitOrderBy.length === 1 &&\n          this.explicitOrderBy[0].field.isKeyField()))\n    );\n  }\n\n  // TODO(b/29183165): This is used to get a unique string from a query to, for\n  // example, use as a dictionary key, but the implementation is subject to\n  // collisions. Make it collision-free.\n  canonicalId(): string {\n    return `${this.toTarget().canonicalId()}|lt:${this.limitType}`;\n  }\n\n  toString(): string {\n    return `Query(target=${this.toTarget().toString()}; limitType=${\n      this.limitType\n    })`;\n  }\n\n  isEqual(other: Query): boolean {\n    return (\n      this.toTarget().isEqual(other.toTarget()) &&\n      this.limitType === other.limitType\n    );\n  }\n\n  docComparator(d1: Document, d2: Document): number {\n    let comparedOnKeyField = false;\n    for (const orderBy of this.orderBy) {\n      const comp = orderBy.compare(d1, d2);\n      if (comp !== 0) {\n        return comp;\n      }\n      comparedOnKeyField = comparedOnKeyField || orderBy.field.isKeyField();\n    }\n    // Assert that we actually compared by key\n    debugAssert(\n      comparedOnKeyField,\n      \"orderBy used that doesn't compare on key field\"\n    );\n    return 0;\n  }\n\n  matches(doc: Document): boolean {\n    return (\n      this.matchesPathAndCollectionGroup(doc) &&\n      this.matchesOrderBy(doc) &&\n      this.matchesFilters(doc) &&\n      this.matchesBounds(doc)\n    );\n  }\n\n  hasLimitToFirst(): boolean {\n    return !isNullOrUndefined(this.limit) && this.limitType === LimitType.First;\n  }\n\n  hasLimitToLast(): boolean {\n    return !isNullOrUndefined(this.limit) && this.limitType === LimitType.Last;\n  }\n\n  getFirstOrderByField(): FieldPath | null {\n    return this.explicitOrderBy.length > 0\n      ? this.explicitOrderBy[0].field\n      : null;\n  }\n\n  getInequalityFilterField(): FieldPath | null {\n    for (const filter of this.filters) {\n      if (filter instanceof FieldFilter && filter.isInequality()) {\n        return filter.field;\n      }\n    }\n    return null;\n  }\n\n  // Checks if any of the provided Operators are included in the query and\n  // returns the first one that is, or null if none are.\n  findFilterOperator(operators: Operator[]): Operator | null {\n    for (const filter of this.filters) {\n      if (filter instanceof FieldFilter) {\n        if (operators.indexOf(filter.op) >= 0) {\n          return filter.op;\n        }\n      }\n    }\n    return null;\n  }\n\n  isDocumentQuery(): boolean {\n    return this.toTarget().isDocumentQuery();\n  }\n\n  isCollectionGroupQuery(): boolean {\n    return this.collectionGroup !== null;\n  }\n\n  /**\n   * Converts this `Query` instance to it's corresponding `Target`\n   * representation.\n   */\n  toTarget(): Target {\n    if (!this.memoizedTarget) {\n      if (this.limitType === LimitType.First) {\n        this.memoizedTarget = new Target(\n          this.path,\n          this.collectionGroup,\n          this.orderBy,\n          this.filters,\n          this.limit,\n          this.startAt,\n          this.endAt\n        );\n      } else {\n        // Flip the orderBy directions since we want the last results\n        const orderBys = [] as OrderBy[];\n        for (const orderBy of this.orderBy) {\n          const dir =\n            orderBy.dir === Direction.DESCENDING\n              ? Direction.ASCENDING\n              : Direction.DESCENDING;\n          orderBys.push(new OrderBy(orderBy.field, dir));\n        }\n\n        // We need to swap the cursors to match the now-flipped query ordering.\n        const startAt = this.endAt\n          ? new Bound(this.endAt.position, !this.endAt.before)\n          : null;\n        const endAt = this.startAt\n          ? new Bound(this.startAt.position, !this.startAt.before)\n          : null;\n\n        // Now return as a LimitType.First query.\n        this.memoizedTarget = new Target(\n          this.path,\n          this.collectionGroup,\n          orderBys,\n          this.filters,\n          this.limit,\n          startAt,\n          endAt\n        );\n      }\n    }\n    return this.memoizedTarget!;\n  }\n\n  private matchesPathAndCollectionGroup(doc: Document): boolean {\n    const docPath = doc.key.path;\n    if (this.collectionGroup !== null) {\n      // NOTE: this.path is currently always empty since we don't expose Collection\n      // Group queries rooted at a document path yet.\n      return (\n        doc.key.hasCollectionId(this.collectionGroup) &&\n        this.path.isPrefixOf(docPath)\n      );\n    } else if (DocumentKey.isDocumentKey(this.path)) {\n      // exact match for document queries\n      return this.path.isEqual(docPath);\n    } else {\n      // shallow ancestor queries by default\n      return this.path.isImmediateParentOf(docPath);\n    }\n  }\n\n  /**\n   * A document must have a value for every ordering clause in order to show up\n   * in the results.\n   */\n  private matchesOrderBy(doc: Document): boolean {\n    for (const orderBy of this.explicitOrderBy) {\n      // order by key always matches\n      if (!orderBy.field.isKeyField() && doc.field(orderBy.field) === null) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  private matchesFilters(doc: Document): boolean {\n    for (const filter of this.filters) {\n      if (!filter.matches(doc)) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  /**\n   * Makes sure a document is within the bounds, if provided.\n   */\n  private matchesBounds(doc: Document): boolean {\n    if (this.startAt && !this.startAt.sortsBeforeDocument(this.orderBy, doc)) {\n      return false;\n    }\n    if (this.endAt && this.endAt.sortsBeforeDocument(this.orderBy, doc)) {\n      return false;\n    }\n    return true;\n  }\n\n  private assertValidBound(bound: Bound): void {\n    debugAssert(\n      bound.position.length <= this.orderBy.length,\n      'Bound is longer than orderBy'\n    );\n  }\n}\n\nexport abstract class Filter {\n  abstract matches(doc: Document): boolean;\n  abstract canonicalId(): string;\n  abstract isEqual(filter: Filter): boolean;\n}\n\nexport const enum Operator {\n  LESS_THAN = '<',\n  LESS_THAN_OR_EQUAL = '<=',\n  EQUAL = '==',\n  GREATER_THAN = '>',\n  GREATER_THAN_OR_EQUAL = '>=',\n  ARRAY_CONTAINS = 'array-contains',\n  IN = 'in',\n  ARRAY_CONTAINS_ANY = 'array-contains-any'\n}\n\nexport class FieldFilter extends Filter {\n  protected constructor(\n    public field: FieldPath,\n    public op: Operator,\n    public value: api.Value\n  ) {\n    super();\n  }\n\n  /**\n   * Creates a filter based on the provided arguments.\n   */\n  static create(field: FieldPath, op: Operator, value: api.Value): FieldFilter {\n    if (field.isKeyField()) {\n      if (op === Operator.IN) {\n        debugAssert(\n          isArray(value),\n          'Comparing on key with IN, but filter value not an ArrayValue'\n        );\n        debugAssert(\n          (value.arrayValue.values || []).every(elem => isReferenceValue(elem)),\n          'Comparing on key with IN, but an array value was not a RefValue'\n        );\n        return new KeyFieldInFilter(field, value);\n      } else {\n        debugAssert(\n          isReferenceValue(value),\n          'Comparing on key, but filter value not a RefValue'\n        );\n        debugAssert(\n          op !== Operator.ARRAY_CONTAINS && op !== Operator.ARRAY_CONTAINS_ANY,\n          `'${op.toString()}' queries don't make sense on document keys.`\n        );\n        return new KeyFieldFilter(field, op, value);\n      }\n    } else if (isNullValue(value)) {\n      if (op !== Operator.EQUAL) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          'Invalid query. Null supports only equality comparisons.'\n        );\n      }\n      return new FieldFilter(field, op, value);\n    } else if (isNanValue(value)) {\n      if (op !== Operator.EQUAL) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          'Invalid query. NaN supports only equality comparisons.'\n        );\n      }\n      return new FieldFilter(field, op, value);\n    } else if (op === Operator.ARRAY_CONTAINS) {\n      return new ArrayContainsFilter(field, value);\n    } else if (op === Operator.IN) {\n      debugAssert(\n        isArray(value),\n        'IN filter has invalid value: ' + value.toString()\n      );\n      return new InFilter(field, value);\n    } else if (op === Operator.ARRAY_CONTAINS_ANY) {\n      debugAssert(\n        isArray(value),\n        'ARRAY_CONTAINS_ANY filter has invalid value: ' + value.toString()\n      );\n      return new ArrayContainsAnyFilter(field, value);\n    } else {\n      return new FieldFilter(field, op, value);\n    }\n  }\n\n  matches(doc: Document): boolean {\n    const other = doc.field(this.field);\n\n    // Only compare types with matching backend order (such as double and int).\n    return (\n      other !== null &&\n      typeOrder(this.value) === typeOrder(other) &&\n      this.matchesComparison(valueCompare(other, this.value))\n    );\n  }\n\n  protected matchesComparison(comparison: number): boolean {\n    switch (this.op) {\n      case Operator.LESS_THAN:\n        return comparison < 0;\n      case Operator.LESS_THAN_OR_EQUAL:\n        return comparison <= 0;\n      case Operator.EQUAL:\n        return comparison === 0;\n      case Operator.GREATER_THAN:\n        return comparison > 0;\n      case Operator.GREATER_THAN_OR_EQUAL:\n        return comparison >= 0;\n      default:\n        return fail('Unknown FieldFilter operator: ' + this.op);\n    }\n  }\n\n  isInequality(): boolean {\n    return (\n      [\n        Operator.LESS_THAN,\n        Operator.LESS_THAN_OR_EQUAL,\n        Operator.GREATER_THAN,\n        Operator.GREATER_THAN_OR_EQUAL\n      ].indexOf(this.op) >= 0\n    );\n  }\n\n  canonicalId(): string {\n    // TODO(b/29183165): Technically, this won't be unique if two values have\n    // the same description, such as the int 3 and the string \"3\". So we should\n    // add the types in here somehow, too.\n    return (\n      this.field.canonicalString() +\n      this.op.toString() +\n      canonicalId(this.value)\n    );\n  }\n\n  isEqual(other: Filter): boolean {\n    if (other instanceof FieldFilter) {\n      return (\n        this.op === other.op &&\n        this.field.isEqual(other.field) &&\n        valueEquals(this.value, other.value)\n      );\n    } else {\n      return false;\n    }\n  }\n\n  toString(): string {\n    return `${this.field.canonicalString()} ${this.op} ${canonicalId(\n      this.value\n    )}`;\n  }\n}\n\n/** Filter that matches on key fields (i.e. '__name__'). */\nexport class KeyFieldFilter extends FieldFilter {\n  private readonly key: DocumentKey;\n\n  constructor(field: FieldPath, op: Operator, value: api.Value) {\n    super(field, op, value);\n    debugAssert(\n      isReferenceValue(value),\n      'KeyFieldFilter expects a ReferenceValue'\n    );\n    this.key = DocumentKey.fromName(value.referenceValue);\n  }\n\n  matches(doc: Document): boolean {\n    const comparison = DocumentKey.comparator(doc.key, this.key);\n    return this.matchesComparison(comparison);\n  }\n}\n\n/** Filter that matches on key fields within an array. */\nexport class KeyFieldInFilter extends FieldFilter {\n  private readonly keys: DocumentKey[];\n\n  constructor(field: FieldPath, value: api.Value) {\n    super(field, Operator.IN, value);\n    debugAssert(isArray(value), 'KeyFieldInFilter expects an ArrayValue');\n    this.keys = (value.arrayValue.values || []).map(v => {\n      debugAssert(\n        isReferenceValue(v),\n        'Comparing on key with IN, but an array value was not a ReferenceValue'\n      );\n      return DocumentKey.fromName(v.referenceValue);\n    });\n  }\n\n  matches(doc: Document): boolean {\n    return this.keys.some(key => key.isEqual(doc.key));\n  }\n}\n\n/** A Filter that implements the array-contains operator. */\nexport class ArrayContainsFilter extends FieldFilter {\n  constructor(field: FieldPath, value: api.Value) {\n    super(field, Operator.ARRAY_CONTAINS, value);\n  }\n\n  matches(doc: Document): boolean {\n    const other = doc.field(this.field);\n    return isArray(other) && arrayValueContains(other.arrayValue, this.value);\n  }\n}\n\n/** A Filter that implements the IN operator. */\nexport class InFilter extends FieldFilter {\n  constructor(field: FieldPath, value: api.Value) {\n    super(field, Operator.IN, value);\n    debugAssert(isArray(value), 'InFilter expects an ArrayValue');\n  }\n\n  matches(doc: Document): boolean {\n    const other = doc.field(this.field);\n    return other !== null && arrayValueContains(this.value.arrayValue!, other);\n  }\n}\n\n/** A Filter that implements the array-contains-any operator. */\nexport class ArrayContainsAnyFilter extends FieldFilter {\n  constructor(field: FieldPath, value: api.Value) {\n    super(field, Operator.ARRAY_CONTAINS_ANY, value);\n    debugAssert(isArray(value), 'ArrayContainsAnyFilter expects an ArrayValue');\n  }\n\n  matches(doc: Document): boolean {\n    const other = doc.field(this.field);\n    if (!isArray(other) || !other.arrayValue.values) {\n      return false;\n    }\n    return other.arrayValue.values.some(val =>\n      arrayValueContains(this.value.arrayValue!, val)\n    );\n  }\n}\n\n/**\n * The direction of sorting in an order by.\n */\nexport const enum Direction {\n  ASCENDING = 'asc',\n  DESCENDING = 'desc'\n}\n\n/**\n * Represents a bound of a query.\n *\n * The bound is specified with the given components representing a position and\n * whether it's just before or just after the position (relative to whatever the\n * query order is).\n *\n * The position represents a logical index position for a query. It's a prefix\n * of values for the (potentially implicit) order by clauses of a query.\n *\n * Bound provides a function to determine whether a document comes before or\n * after a bound. This is influenced by whether the position is just before or\n * just after the provided values.\n */\nexport class Bound {\n  constructor(readonly position: api.Value[], readonly before: boolean) {}\n\n  canonicalId(): string {\n    // TODO(b/29183165): Make this collision robust.\n    return `${this.before ? 'b' : 'a'}:${this.position\n      .map(p => canonicalId(p))\n      .join(',')}`;\n  }\n\n  /**\n   * Returns true if a document sorts before a bound using the provided sort\n   * order.\n   */\n  sortsBeforeDocument(orderBy: OrderBy[], doc: Document): boolean {\n    debugAssert(\n      this.position.length <= orderBy.length,\n      \"Bound has more components than query's orderBy\"\n    );\n    let comparison = 0;\n    for (let i = 0; i < this.position.length; i++) {\n      const orderByComponent = orderBy[i];\n      const component = this.position[i];\n      if (orderByComponent.field.isKeyField()) {\n        debugAssert(\n          isReferenceValue(component),\n          'Bound has a non-key value where the key path is being used.'\n        );\n        comparison = DocumentKey.comparator(\n          DocumentKey.fromName(component.referenceValue),\n          doc.key\n        );\n      } else {\n        const docValue = doc.field(orderByComponent.field);\n        debugAssert(\n          docValue !== null,\n          'Field should exist since document matched the orderBy already.'\n        );\n        comparison = valueCompare(component, docValue);\n      }\n      if (orderByComponent.dir === Direction.DESCENDING) {\n        comparison = comparison * -1;\n      }\n      if (comparison !== 0) {\n        break;\n      }\n    }\n    return this.before ? comparison <= 0 : comparison < 0;\n  }\n\n  isEqual(other: Bound | null): boolean {\n    if (other === null) {\n      return false;\n    }\n    if (\n      this.before !== other.before ||\n      this.position.length !== other.position.length\n    ) {\n      return false;\n    }\n    for (let i = 0; i < this.position.length; i++) {\n      const thisPosition = this.position[i];\n      const otherPosition = other.position[i];\n      if (!valueEquals(thisPosition, otherPosition)) {\n        return false;\n      }\n    }\n    return true;\n  }\n}\n\n/**\n * An ordering on a field, in some Direction. Direction defaults to ASCENDING.\n */\nexport class OrderBy {\n  readonly dir: Direction;\n  private readonly isKeyOrderBy: boolean;\n\n  constructor(readonly field: FieldPath, dir?: Direction) {\n    if (dir === undefined) {\n      dir = Direction.ASCENDING;\n    }\n    this.dir = dir;\n    this.isKeyOrderBy = field.isKeyField();\n  }\n\n  compare(d1: Document, d2: Document): number {\n    const comparison = this.isKeyOrderBy\n      ? DocumentKey.comparator(d1.key, d2.key)\n      : compareDocumentsByField(this.field, d1, d2);\n    switch (this.dir) {\n      case Direction.ASCENDING:\n        return comparison;\n      case Direction.DESCENDING:\n        return -1 * comparison;\n      default:\n        return fail('Unknown direction: ' + this.dir);\n    }\n  }\n\n  canonicalId(): string {\n    // TODO(b/29183165): Make this collision robust.\n    return this.field.canonicalString() + this.dir.toString();\n  }\n\n  toString(): string {\n    return `${this.field.canonicalString()} (${this.dir})`;\n  }\n\n  isEqual(other: OrderBy): boolean {\n    return this.dir === other.dir && this.field.isEqual(other.field);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { Target } from '../core/target';\nimport { ListenSequenceNumber, TargetId } from '../core/types';\nimport { ByteString } from '../util/byte_string';\n\n/** An enumeration of the different purposes we have for targets. */\nexport const enum TargetPurpose {\n  /** A regular, normal query target. */\n  Listen,\n\n  /**\n   * The query target was used to refill a query after an existence filter mismatch.\n   */\n  ExistenceFilterMismatch,\n\n  /** The query target was used to resolve a limbo document. */\n  LimboResolution\n}\n\n/**\n * An immutable set of metadata that the local store tracks for each target.\n */\nexport class TargetData {\n  constructor(\n    /** The target being listened to. */\n    readonly target: Target,\n    /**\n     * The target ID to which the target corresponds; Assigned by the\n     * LocalStore for user listens and by the SyncEngine for limbo watches.\n     */\n    readonly targetId: TargetId,\n    /** The purpose of the target. */\n    readonly purpose: TargetPurpose,\n    /**\n     * The sequence number of the last transaction during which this target data\n     * was modified.\n     */\n    readonly sequenceNumber: ListenSequenceNumber,\n    /** The latest snapshot version seen for this target. */\n    readonly snapshotVersion: SnapshotVersion = SnapshotVersion.min(),\n    /**\n     * The maximum snapshot version at which the associated view\n     * contained no limbo documents.\n     */\n    readonly lastLimboFreeSnapshotVersion: SnapshotVersion = SnapshotVersion.min(),\n    /**\n     * An opaque, server-assigned token that allows watching a target to be\n     * resumed after disconnecting without retransmitting all the data that\n     * matches the target. The resume token essentially identifies a point in\n     * time from which the server should resume sending results.\n     */\n    readonly resumeToken: ByteString = ByteString.EMPTY_BYTE_STRING\n  ) {}\n\n  /** Creates a new target data instance with an updated sequence number. */\n  withSequenceNumber(sequenceNumber: number): TargetData {\n    return new TargetData(\n      this.target,\n      this.targetId,\n      this.purpose,\n      sequenceNumber,\n      this.snapshotVersion,\n      this.lastLimboFreeSnapshotVersion,\n      this.resumeToken\n    );\n  }\n\n  /**\n   * Creates a new target data instance with an updated resume token and\n   * snapshot version.\n   */\n  withResumeToken(\n    resumeToken: ByteString,\n    snapshotVersion: SnapshotVersion\n  ): TargetData {\n    return new TargetData(\n      this.target,\n      this.targetId,\n      this.purpose,\n      this.sequenceNumber,\n      snapshotVersion,\n      this.lastLimboFreeSnapshotVersion,\n      resumeToken\n    );\n  }\n\n  /**\n   * Creates a new target data instance with an updated last limbo free\n   * snapshot version number.\n   */\n  withLastLimboFreeSnapshotVersion(\n    lastLimboFreeSnapshotVersion: SnapshotVersion\n  ): TargetData {\n    return new TargetData(\n      this.target,\n      this.targetId,\n      this.purpose,\n      this.sequenceNumber,\n      this.snapshotVersion,\n      lastLimboFreeSnapshotVersion,\n      this.resumeToken\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert, fail } from './assert';\n\n/*\n * Implementation of an immutable SortedMap using a Left-leaning\n * Red-Black Tree, adapted from the implementation in Mugs\n * (http://mads379.github.com/mugs/) by Mads Hartmann Jensen\n * (mads379@gmail.com).\n *\n * Original paper on Left-leaning Red-Black Trees:\n *   http://www.cs.princeton.edu/~rs/talks/LLRB/LLRB.pdf\n *\n * Invariant 1: No red node has a red child\n * Invariant 2: Every leaf path has the same number of black nodes\n * Invariant 3: Only the left child can be red (left leaning)\n */\n\nexport type Comparator<K> = (key1: K, key2: K) => number;\n\nexport interface Entry<K, V> {\n  key: K;\n  value: V;\n}\n\n// An immutable sorted map implementation, based on a Left-leaning Red-Black\n// tree.\nexport class SortedMap<K, V> {\n  // visible for testing\n  root: LLRBNode<K, V> | LLRBEmptyNode<K, V>;\n\n  constructor(\n    public comparator: Comparator<K>,\n    root?: LLRBNode<K, V> | LLRBEmptyNode<K, V>\n  ) {\n    this.root = root ? root : LLRBNode.EMPTY;\n  }\n\n  // Returns a copy of the map, with the specified key/value added or replaced.\n  insert(key: K, value: V): SortedMap<K, V> {\n    return new SortedMap<K, V>(\n      this.comparator,\n      this.root\n        .insert(key, value, this.comparator)\n        .copy(null, null, LLRBNode.BLACK, null, null)\n    );\n  }\n\n  // Returns a copy of the map, with the specified key removed.\n  remove(key: K): SortedMap<K, V> {\n    return new SortedMap<K, V>(\n      this.comparator,\n      this.root\n        .remove(key, this.comparator)\n        .copy(null, null, LLRBNode.BLACK, null, null)\n    );\n  }\n\n  // Returns the value of the node with the given key, or null.\n  get(key: K): V | null {\n    let node = this.root;\n    while (!node.isEmpty()) {\n      const cmp = this.comparator(key, node.key);\n      if (cmp === 0) {\n        return node.value;\n      } else if (cmp < 0) {\n        node = node.left;\n      } else if (cmp > 0) {\n        node = node.right;\n      }\n    }\n    return null;\n  }\n\n  // Returns the index of the element in this sorted map, or -1 if it doesn't\n  // exist.\n  indexOf(key: K): number {\n    // Number of nodes that were pruned when descending right\n    let prunedNodes = 0;\n    let node = this.root;\n    while (!node.isEmpty()) {\n      const cmp = this.comparator(key, node.key);\n      if (cmp === 0) {\n        return prunedNodes + node.left.size;\n      } else if (cmp < 0) {\n        node = node.left;\n      } else {\n        // Count all nodes left of the node plus the node itself\n        prunedNodes += node.left.size + 1;\n        node = node.right;\n      }\n    }\n    // Node not found\n    return -1;\n  }\n\n  isEmpty(): boolean {\n    return this.root.isEmpty();\n  }\n\n  // Returns the total number of nodes in the map.\n  get size(): number {\n    return this.root.size;\n  }\n\n  // Returns the minimum key in the map.\n  minKey(): K | null {\n    return this.root.minKey();\n  }\n\n  // Returns the maximum key in the map.\n  maxKey(): K | null {\n    return this.root.maxKey();\n  }\n\n  // Traverses the map in key order and calls the specified action function\n  // for each key/value pair. If action returns true, traversal is aborted.\n  // Returns the first truthy value returned by action, or the last falsey\n  // value returned by action.\n  inorderTraversal<T>(action: (k: K, v: V) => T): T {\n    return (this.root as LLRBNode<K, V>).inorderTraversal(action);\n  }\n\n  forEach(fn: (k: K, v: V) => void): void {\n    this.inorderTraversal((k, v) => {\n      fn(k, v);\n      return false;\n    });\n  }\n\n  toString(): string {\n    const descriptions: string[] = [];\n    this.inorderTraversal((k, v) => {\n      descriptions.push(`${k}:${v}`);\n      return false;\n    });\n    return `{${descriptions.join(', ')}}`;\n  }\n\n  // Traverses the map in reverse key order and calls the specified action\n  // function for each key/value pair. If action returns true, traversal is\n  // aborted.\n  // Returns the first truthy value returned by action, or the last falsey\n  // value returned by action.\n  reverseTraversal<T>(action: (k: K, v: V) => T): T {\n    return (this.root as LLRBNode<K, V>).reverseTraversal(action);\n  }\n\n  // Returns an iterator over the SortedMap.\n  getIterator(): SortedMapIterator<K, V> {\n    return new SortedMapIterator<K, V>(this.root, null, this.comparator, false);\n  }\n\n  getIteratorFrom(key: K): SortedMapIterator<K, V> {\n    return new SortedMapIterator<K, V>(this.root, key, this.comparator, false);\n  }\n\n  getReverseIterator(): SortedMapIterator<K, V> {\n    return new SortedMapIterator<K, V>(this.root, null, this.comparator, true);\n  }\n\n  getReverseIteratorFrom(key: K): SortedMapIterator<K, V> {\n    return new SortedMapIterator<K, V>(this.root, key, this.comparator, true);\n  }\n} // end SortedMap\n\n// An iterator over an LLRBNode.\nexport class SortedMapIterator<K, V> {\n  private isReverse: boolean;\n  private nodeStack: Array<LLRBNode<K, V> | LLRBEmptyNode<K, V>>;\n\n  constructor(\n    node: LLRBNode<K, V> | LLRBEmptyNode<K, V>,\n    startKey: K | null,\n    comparator: Comparator<K>,\n    isReverse: boolean\n  ) {\n    this.isReverse = isReverse;\n    this.nodeStack = [];\n\n    let cmp = 1;\n    while (!node.isEmpty()) {\n      cmp = startKey ? comparator(node.key, startKey) : 1;\n      // flip the comparison if we're going in reverse\n      if (isReverse) {\n        cmp *= -1;\n      }\n\n      if (cmp < 0) {\n        // This node is less than our start key. ignore it\n        if (this.isReverse) {\n          node = node.left;\n        } else {\n          node = node.right;\n        }\n      } else if (cmp === 0) {\n        // This node is exactly equal to our start key. Push it on the stack,\n        // but stop iterating;\n        this.nodeStack.push(node);\n        break;\n      } else {\n        // This node is greater than our start key, add it to the stack and move\n        // to the next one\n        this.nodeStack.push(node);\n        if (this.isReverse) {\n          node = node.right;\n        } else {\n          node = node.left;\n        }\n      }\n    }\n  }\n\n  getNext(): Entry<K, V> {\n    debugAssert(\n      this.nodeStack.length > 0,\n      'getNext() called on iterator when hasNext() is false.'\n    );\n\n    let node = this.nodeStack.pop()!;\n    const result = { key: node.key, value: node.value };\n\n    if (this.isReverse) {\n      node = node.left;\n      while (!node.isEmpty()) {\n        this.nodeStack.push(node);\n        node = node.right;\n      }\n    } else {\n      node = node.right;\n      while (!node.isEmpty()) {\n        this.nodeStack.push(node);\n        node = node.left;\n      }\n    }\n\n    return result;\n  }\n\n  hasNext(): boolean {\n    return this.nodeStack.length > 0;\n  }\n\n  peek(): Entry<K, V> | null {\n    if (this.nodeStack.length === 0) {\n      return null;\n    }\n\n    const node = this.nodeStack[this.nodeStack.length - 1];\n    return { key: node.key, value: node.value };\n  }\n} // end SortedMapIterator\n\n// Represents a node in a Left-leaning Red-Black tree.\nexport class LLRBNode<K, V> {\n  readonly color: boolean;\n  readonly left: LLRBNode<K, V> | LLRBEmptyNode<K, V>;\n  readonly right: LLRBNode<K, V> | LLRBEmptyNode<K, V>;\n  readonly size: number;\n\n  // Empty node is shared between all LLRB trees.\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  static EMPTY: LLRBEmptyNode<any, any> = null as any;\n\n  static RED = true;\n  static BLACK = false;\n\n  constructor(\n    public key: K,\n    public value: V,\n    color?: boolean,\n    left?: LLRBNode<K, V> | LLRBEmptyNode<K, V>,\n    right?: LLRBNode<K, V> | LLRBEmptyNode<K, V>\n  ) {\n    this.color = color != null ? color : LLRBNode.RED;\n    this.left = left != null ? left : LLRBNode.EMPTY;\n    this.right = right != null ? right : LLRBNode.EMPTY;\n    this.size = this.left.size + 1 + this.right.size;\n  }\n\n  // Returns a copy of the current node, optionally replacing pieces of it.\n  copy(\n    key: K | null,\n    value: V | null,\n    color: boolean | null,\n    left: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null,\n    right: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null\n  ): LLRBNode<K, V> {\n    return new LLRBNode<K, V>(\n      key != null ? key : this.key,\n      value != null ? value : this.value,\n      color != null ? color : this.color,\n      left != null ? left : this.left,\n      right != null ? right : this.right\n    );\n  }\n\n  isEmpty(): boolean {\n    return false;\n  }\n\n  // Traverses the tree in key order and calls the specified action function\n  // for each node. If action returns true, traversal is aborted.\n  // Returns the first truthy value returned by action, or the last falsey\n  // value returned by action.\n  inorderTraversal<T>(action: (k: K, v: V) => T): T {\n    return (\n      (this.left as LLRBNode<K, V>).inorderTraversal(action) ||\n      action(this.key, this.value) ||\n      (this.right as LLRBNode<K, V>).inorderTraversal(action)\n    );\n  }\n\n  // Traverses the tree in reverse key order and calls the specified action\n  // function for each node. If action returns true, traversal is aborted.\n  // Returns the first truthy value returned by action, or the last falsey\n  // value returned by action.\n  reverseTraversal<T>(action: (k: K, v: V) => T): T {\n    return (\n      (this.right as LLRBNode<K, V>).reverseTraversal(action) ||\n      action(this.key, this.value) ||\n      (this.left as LLRBNode<K, V>).reverseTraversal(action)\n    );\n  }\n\n  // Returns the minimum node in the tree.\n  private min(): LLRBNode<K, V> {\n    if (this.left.isEmpty()) {\n      return this;\n    } else {\n      return (this.left as LLRBNode<K, V>).min();\n    }\n  }\n\n  // Returns the maximum key in the tree.\n  minKey(): K | null {\n    return this.min().key;\n  }\n\n  // Returns the maximum key in the tree.\n  maxKey(): K | null {\n    if (this.right.isEmpty()) {\n      return this.key;\n    } else {\n      return this.right.maxKey();\n    }\n  }\n\n  // Returns new tree, with the key/value added.\n  insert(key: K, value: V, comparator: Comparator<K>): LLRBNode<K, V> {\n    let n: LLRBNode<K, V> = this;\n    const cmp = comparator(key, n.key);\n    if (cmp < 0) {\n      n = n.copy(null, null, null, n.left.insert(key, value, comparator), null);\n    } else if (cmp === 0) {\n      n = n.copy(null, value, null, null, null);\n    } else {\n      n = n.copy(\n        null,\n        null,\n        null,\n        null,\n        n.right.insert(key, value, comparator)\n      );\n    }\n    return n.fixUp();\n  }\n\n  private removeMin(): LLRBNode<K, V> | LLRBEmptyNode<K, V> {\n    if (this.left.isEmpty()) {\n      return LLRBNode.EMPTY;\n    }\n    let n: LLRBNode<K, V> = this;\n    if (!n.left.isRed() && !n.left.left.isRed()) {\n      n = n.moveRedLeft();\n    }\n    n = n.copy(null, null, null, (n.left as LLRBNode<K, V>).removeMin(), null);\n    return n.fixUp();\n  }\n\n  // Returns new tree, with the specified item removed.\n  remove(\n    key: K,\n    comparator: Comparator<K>\n  ): LLRBNode<K, V> | LLRBEmptyNode<K, V> {\n    let smallest: LLRBNode<K, V>;\n    let n: LLRBNode<K, V> = this;\n    if (comparator(key, n.key) < 0) {\n      if (!n.left.isEmpty() && !n.left.isRed() && !n.left.left.isRed()) {\n        n = n.moveRedLeft();\n      }\n      n = n.copy(null, null, null, n.left.remove(key, comparator), null);\n    } else {\n      if (n.left.isRed()) {\n        n = n.rotateRight();\n      }\n      if (!n.right.isEmpty() && !n.right.isRed() && !n.right.left.isRed()) {\n        n = n.moveRedRight();\n      }\n      if (comparator(key, n.key) === 0) {\n        if (n.right.isEmpty()) {\n          return LLRBNode.EMPTY;\n        } else {\n          smallest = (n.right as LLRBNode<K, V>).min();\n          n = n.copy(\n            smallest.key,\n            smallest.value,\n            null,\n            null,\n            (n.right as LLRBNode<K, V>).removeMin()\n          );\n        }\n      }\n      n = n.copy(null, null, null, null, n.right.remove(key, comparator));\n    }\n    return n.fixUp();\n  }\n\n  isRed(): boolean {\n    return this.color;\n  }\n\n  // Returns new tree after performing any needed rotations.\n  private fixUp(): LLRBNode<K, V> {\n    let n: LLRBNode<K, V> = this;\n    if (n.right.isRed() && !n.left.isRed()) {\n      n = n.rotateLeft();\n    }\n    if (n.left.isRed() && n.left.left.isRed()) {\n      n = n.rotateRight();\n    }\n    if (n.left.isRed() && n.right.isRed()) {\n      n = n.colorFlip();\n    }\n    return n;\n  }\n\n  private moveRedLeft(): LLRBNode<K, V> {\n    let n = this.colorFlip();\n    if (n.right.left.isRed()) {\n      n = n.copy(\n        null,\n        null,\n        null,\n        null,\n        (n.right as LLRBNode<K, V>).rotateRight()\n      );\n      n = n.rotateLeft();\n      n = n.colorFlip();\n    }\n    return n;\n  }\n\n  private moveRedRight(): LLRBNode<K, V> {\n    let n = this.colorFlip();\n    if (n.left.left.isRed()) {\n      n = n.rotateRight();\n      n = n.colorFlip();\n    }\n    return n;\n  }\n\n  private rotateLeft(): LLRBNode<K, V> {\n    const nl = this.copy(null, null, LLRBNode.RED, null, this.right.left);\n    return (this.right as LLRBNode<K, V>).copy(\n      null,\n      null,\n      this.color,\n      nl,\n      null\n    );\n  }\n\n  private rotateRight(): LLRBNode<K, V> {\n    const nr = this.copy(null, null, LLRBNode.RED, this.left.right, null);\n    return (this.left as LLRBNode<K, V>).copy(null, null, this.color, null, nr);\n  }\n\n  private colorFlip(): LLRBNode<K, V> {\n    const left = this.left.copy(null, null, !this.left.color, null, null);\n    const right = this.right.copy(null, null, !this.right.color, null, null);\n    return this.copy(null, null, !this.color, left, right);\n  }\n\n  // For testing.\n  checkMaxDepth(): boolean {\n    const blackDepth = this.check();\n    if (Math.pow(2.0, blackDepth) <= this.size + 1) {\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  // In a balanced RB tree, the black-depth (number of black nodes) from root to\n  // leaves is equal on both sides.  This function verifies that or asserts.\n  protected check(): number {\n    if (this.isRed() && this.left.isRed()) {\n      throw fail('Red node has red child(' + this.key + ',' + this.value + ')');\n    }\n    if (this.right.isRed()) {\n      throw fail('Right child of (' + this.key + ',' + this.value + ') is red');\n    }\n    const blackDepth = (this.left as LLRBNode<K, V>).check();\n    if (blackDepth !== (this.right as LLRBNode<K, V>).check()) {\n      throw fail('Black depths differ');\n    } else {\n      return blackDepth + (this.isRed() ? 0 : 1);\n    }\n  }\n} // end LLRBNode\n\n// Represents an empty node (a leaf node in the Red-Black Tree).\nexport class LLRBEmptyNode<K, V> {\n  get key(): never {\n    throw fail('LLRBEmptyNode has no key.');\n  }\n  get value(): never {\n    throw fail('LLRBEmptyNode has no value.');\n  }\n  get color(): never {\n    throw fail('LLRBEmptyNode has no color.');\n  }\n  get left(): never {\n    throw fail('LLRBEmptyNode has no left child.');\n  }\n  get right(): never {\n    throw fail('LLRBEmptyNode has no right child.');\n  }\n  size = 0;\n\n  // Returns a copy of the current node.\n  copy(\n    key: K | null,\n    value: V | null,\n    color: boolean | null,\n    left: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null,\n    right: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null\n  ): LLRBEmptyNode<K, V> {\n    return this;\n  }\n\n  // Returns a copy of the tree, with the specified key/value added.\n  insert(key: K, value: V, comparator: Comparator<K>): LLRBNode<K, V> {\n    return new LLRBNode<K, V>(key, value);\n  }\n\n  // Returns a copy of the tree, with the specified key removed.\n  remove(key: K, comparator: Comparator<K>): LLRBEmptyNode<K, V> {\n    return this;\n  }\n\n  isEmpty(): boolean {\n    return true;\n  }\n\n  inorderTraversal(action: (k: K, v: V) => boolean): boolean {\n    return false;\n  }\n\n  reverseTraversal(action: (k: K, v: V) => boolean): boolean {\n    return false;\n  }\n\n  minKey(): K | null {\n    return null;\n  }\n\n  maxKey(): K | null {\n    return null;\n  }\n\n  isRed(): boolean {\n    return false;\n  }\n\n  // For testing.\n  checkMaxDepth(): boolean {\n    return true;\n  }\n\n  protected check(): 0 {\n    return 0;\n  }\n} // end LLRBEmptyNode\n\nLLRBNode.EMPTY = new LLRBEmptyNode<unknown, unknown>();\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SortedMap, SortedMapIterator } from './sorted_map';\n\n/**\n * SortedSet is an immutable (copy-on-write) collection that holds elements\n * in order specified by the provided comparator.\n *\n * NOTE: if provided comparator returns 0 for two elements, we consider them to\n * be equal!\n */\nexport class SortedSet<T> {\n  private data: SortedMap<T, boolean>;\n\n  constructor(private comparator: (left: T, right: T) => number) {\n    this.data = new SortedMap<T, boolean>(this.comparator);\n  }\n\n  has(elem: T): boolean {\n    return this.data.get(elem) !== null;\n  }\n\n  first(): T | null {\n    return this.data.minKey();\n  }\n\n  last(): T | null {\n    return this.data.maxKey();\n  }\n\n  get size(): number {\n    return this.data.size;\n  }\n\n  indexOf(elem: T): number {\n    return this.data.indexOf(elem);\n  }\n\n  /** Iterates elements in order defined by \"comparator\" */\n  forEach(cb: (elem: T) => void): void {\n    this.data.inorderTraversal((k: T, v: boolean) => {\n      cb(k);\n      return false;\n    });\n  }\n\n  /** Iterates over `elem`s such that: range[0] <= elem < range[1]. */\n  forEachInRange(range: [T, T], cb: (elem: T) => void): void {\n    const iter = this.data.getIteratorFrom(range[0]);\n    while (iter.hasNext()) {\n      const elem = iter.getNext();\n      if (this.comparator(elem.key, range[1]) >= 0) {\n        return;\n      }\n      cb(elem.key);\n    }\n  }\n\n  /**\n   * Iterates over `elem`s such that: start <= elem until false is returned.\n   */\n  forEachWhile(cb: (elem: T) => boolean, start?: T): void {\n    let iter: SortedMapIterator<T, boolean>;\n    if (start !== undefined) {\n      iter = this.data.getIteratorFrom(start);\n    } else {\n      iter = this.data.getIterator();\n    }\n    while (iter.hasNext()) {\n      const elem = iter.getNext();\n      const result = cb(elem.key);\n      if (!result) {\n        return;\n      }\n    }\n  }\n\n  /** Finds the least element greater than or equal to `elem`. */\n  firstAfterOrEqual(elem: T): T | null {\n    const iter = this.data.getIteratorFrom(elem);\n    return iter.hasNext() ? iter.getNext().key : null;\n  }\n\n  getIterator(): SortedSetIterator<T> {\n    return new SortedSetIterator<T>(this.data.getIterator());\n  }\n\n  getIteratorFrom(key: T): SortedSetIterator<T> {\n    return new SortedSetIterator<T>(this.data.getIteratorFrom(key));\n  }\n\n  /** Inserts or updates an element */\n  add(elem: T): SortedSet<T> {\n    return this.copy(this.data.remove(elem).insert(elem, true));\n  }\n\n  /** Deletes an element */\n  delete(elem: T): SortedSet<T> {\n    if (!this.has(elem)) {\n      return this;\n    }\n    return this.copy(this.data.remove(elem));\n  }\n\n  isEmpty(): boolean {\n    return this.data.isEmpty();\n  }\n\n  unionWith(other: SortedSet<T>): SortedSet<T> {\n    let result: SortedSet<T> = this;\n\n    // Make sure `result` always refers to the larger one of the two sets.\n    if (result.size < other.size) {\n      result = other;\n      other = this;\n    }\n\n    other.forEach(elem => {\n      result = result.add(elem);\n    });\n    return result;\n  }\n\n  isEqual(other: SortedSet<T>): boolean {\n    if (!(other instanceof SortedSet)) {\n      return false;\n    }\n    if (this.size !== other.size) {\n      return false;\n    }\n\n    const thisIt = this.data.getIterator();\n    const otherIt = other.data.getIterator();\n    while (thisIt.hasNext()) {\n      const thisElem = thisIt.getNext().key;\n      const otherElem = otherIt.getNext().key;\n      if (this.comparator(thisElem, otherElem) !== 0) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  toArray(): T[] {\n    const res: T[] = [];\n    this.forEach(targetId => {\n      res.push(targetId);\n    });\n    return res;\n  }\n\n  toString(): string {\n    const result: T[] = [];\n    this.forEach(elem => result.push(elem));\n    return 'SortedSet(' + result.toString() + ')';\n  }\n\n  private copy(data: SortedMap<T, boolean>): SortedSet<T> {\n    const result = new SortedSet(this.comparator);\n    result.data = data;\n    return result;\n  }\n}\n\nexport class SortedSetIterator<T> {\n  constructor(private iter: SortedMapIterator<T, boolean>) {}\n\n  getNext(): T {\n    return this.iter.getNext().key;\n  }\n\n  hasNext(): boolean {\n    return this.iter.hasNext();\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { SortedMap } from '../util/sorted_map';\nimport { SortedSet } from '../util/sorted_set';\n\nimport { TargetId } from '../core/types';\nimport { primitiveComparator } from '../util/misc';\nimport { Document, MaybeDocument } from './document';\nimport { DocumentKey } from './document_key';\n\n/** Miscellaneous collection types / constants. */\nexport interface DocumentSizeEntry {\n  maybeDocument: MaybeDocument;\n  size: number;\n}\n\nexport type MaybeDocumentMap = SortedMap<DocumentKey, MaybeDocument>;\nconst EMPTY_MAYBE_DOCUMENT_MAP = new SortedMap<DocumentKey, MaybeDocument>(\n  DocumentKey.comparator\n);\nexport function maybeDocumentMap(): MaybeDocumentMap {\n  return EMPTY_MAYBE_DOCUMENT_MAP;\n}\n\nexport type NullableMaybeDocumentMap = SortedMap<\n  DocumentKey,\n  MaybeDocument | null\n>;\n\nexport function nullableMaybeDocumentMap(): NullableMaybeDocumentMap {\n  return maybeDocumentMap();\n}\n\nexport interface DocumentSizeEntries {\n  maybeDocuments: NullableMaybeDocumentMap;\n  sizeMap: SortedMap<DocumentKey, number>;\n}\n\nexport type DocumentMap = SortedMap<DocumentKey, Document>;\nconst EMPTY_DOCUMENT_MAP = new SortedMap<DocumentKey, Document>(\n  DocumentKey.comparator\n);\nexport function documentMap(): DocumentMap {\n  return EMPTY_DOCUMENT_MAP;\n}\n\nexport type DocumentVersionMap = SortedMap<DocumentKey, SnapshotVersion>;\nconst EMPTY_DOCUMENT_VERSION_MAP = new SortedMap<DocumentKey, SnapshotVersion>(\n  DocumentKey.comparator\n);\nexport function documentVersionMap(): DocumentVersionMap {\n  return EMPTY_DOCUMENT_VERSION_MAP;\n}\n\nexport type DocumentKeySet = SortedSet<DocumentKey>;\nconst EMPTY_DOCUMENT_KEY_SET = new SortedSet(DocumentKey.comparator);\nexport function documentKeySet(...keys: DocumentKey[]): DocumentKeySet {\n  let set = EMPTY_DOCUMENT_KEY_SET;\n  for (const key of keys) {\n    set = set.add(key);\n  }\n  return set;\n}\n\nexport type TargetIdSet = SortedSet<TargetId>;\nconst EMPTY_TARGET_ID_SET = new SortedSet<TargetId>(primitiveComparator);\nexport function targetIdSet(): SortedSet<TargetId> {\n  return EMPTY_TARGET_ID_SET;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { TargetId } from '../core/types';\nimport { ChangeType } from '../core/view_snapshot';\nimport { TargetData, TargetPurpose } from '../local/target_data';\nimport {\n  documentKeySet,\n  DocumentKeySet,\n  maybeDocumentMap\n} from '../model/collections';\nimport { Document, MaybeDocument, NoDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { debugAssert, fail, hardAssert } from '../util/assert';\nimport { FirestoreError } from '../util/error';\nimport { logDebug } from '../util/log';\nimport { primitiveComparator } from '../util/misc';\nimport { SortedMap } from '../util/sorted_map';\nimport { SortedSet } from '../util/sorted_set';\nimport { ExistenceFilter } from './existence_filter';\nimport { RemoteEvent, TargetChange } from './remote_event';\nimport { ByteString } from '../util/byte_string';\n\n/**\n * Internal representation of the watcher API protocol buffers.\n */\nexport type WatchChange =\n  | DocumentWatchChange\n  | WatchTargetChange\n  | ExistenceFilterChange;\n\n/**\n * Represents a changed document and a list of target ids to which this change\n * applies.\n *\n * If document has been deleted NoDocument will be provided.\n */\nexport class DocumentWatchChange {\n  constructor(\n    /** The new document applies to all of these targets. */\n    public updatedTargetIds: TargetId[],\n    /** The new document is removed from all of these targets. */\n    public removedTargetIds: TargetId[],\n    /** The key of the document for this change. */\n    public key: DocumentKey,\n    /**\n     * The new document or NoDocument if it was deleted. Is null if the\n     * document went out of view without the server sending a new document.\n     */\n    public newDoc: MaybeDocument | null\n  ) {}\n}\n\nexport class ExistenceFilterChange {\n  constructor(\n    public targetId: TargetId,\n    public existenceFilter: ExistenceFilter\n  ) {}\n}\n\nexport const enum WatchTargetChangeState {\n  NoChange,\n  Added,\n  Removed,\n  Current,\n  Reset\n}\n\nexport class WatchTargetChange {\n  constructor(\n    /** What kind of change occurred to the watch target. */\n    public state: WatchTargetChangeState,\n    /** The target IDs that were added/removed/set. */\n    public targetIds: TargetId[],\n    /**\n     * An opaque, server-assigned token that allows watching a target to be\n     * resumed after disconnecting without retransmitting all the data that\n     * matches the target. The resume token essentially identifies a point in\n     * time from which the server should resume sending results.\n     */\n    public resumeToken: ByteString = ByteString.EMPTY_BYTE_STRING,\n    /** An RPC error indicating why the watch failed. */\n    public cause: FirestoreError | null = null\n  ) {}\n}\n\n/** Tracks the internal state of a Watch target. */\nclass TargetState {\n  /**\n   * The number of pending responses (adds or removes) that we are waiting on.\n   * We only consider targets active that have no pending responses.\n   */\n  private pendingResponses = 0;\n\n  /**\n   * Keeps track of the document changes since the last raised snapshot.\n   *\n   * These changes are continuously updated as we receive document updates and\n   * always reflect the current set of changes against the last issued snapshot.\n   */\n  private documentChanges: SortedMap<\n    DocumentKey,\n    ChangeType\n  > = snapshotChangesMap();\n\n  /** See public getters for explanations of these fields. */\n  private _resumeToken: ByteString = ByteString.EMPTY_BYTE_STRING;\n  private _current = false;\n\n  /**\n   * Whether this target state should be included in the next snapshot. We\n   * initialize to true so that newly-added targets are included in the next\n   * RemoteEvent.\n   */\n  private _hasPendingChanges = true;\n\n  /**\n   * Whether this target has been marked 'current'.\n   *\n   * 'Current' has special meaning in the RPC protocol: It implies that the\n   * Watch backend has sent us all changes up to the point at which the target\n   * was added and that the target is consistent with the rest of the watch\n   * stream.\n   */\n  get current(): boolean {\n    return this._current;\n  }\n\n  /** The last resume token sent to us for this target. */\n  get resumeToken(): ByteString {\n    return this._resumeToken;\n  }\n\n  /** Whether this target has pending target adds or target removes. */\n  get isPending(): boolean {\n    return this.pendingResponses !== 0;\n  }\n\n  /** Whether we have modified any state that should trigger a snapshot. */\n  get hasPendingChanges(): boolean {\n    return this._hasPendingChanges;\n  }\n\n  /**\n   * Applies the resume token to the TargetChange, but only when it has a new\n   * value. Empty resumeTokens are discarded.\n   */\n  updateResumeToken(resumeToken: ByteString): void {\n    if (resumeToken.approximateByteSize() > 0) {\n      this._hasPendingChanges = true;\n      this._resumeToken = resumeToken;\n    }\n  }\n\n  /**\n   * Creates a target change from the current set of changes.\n   *\n   * To reset the document changes after raising this snapshot, call\n   * `clearPendingChanges()`.\n   */\n  toTargetChange(): TargetChange {\n    let addedDocuments = documentKeySet();\n    let modifiedDocuments = documentKeySet();\n    let removedDocuments = documentKeySet();\n\n    this.documentChanges.forEach((key, changeType) => {\n      switch (changeType) {\n        case ChangeType.Added:\n          addedDocuments = addedDocuments.add(key);\n          break;\n        case ChangeType.Modified:\n          modifiedDocuments = modifiedDocuments.add(key);\n          break;\n        case ChangeType.Removed:\n          removedDocuments = removedDocuments.add(key);\n          break;\n        default:\n          fail('Encountered invalid change type: ' + changeType);\n      }\n    });\n\n    return new TargetChange(\n      this._resumeToken,\n      this._current,\n      addedDocuments,\n      modifiedDocuments,\n      removedDocuments\n    );\n  }\n\n  /**\n   * Resets the document changes and sets `hasPendingChanges` to false.\n   */\n  clearPendingChanges(): void {\n    this._hasPendingChanges = false;\n    this.documentChanges = snapshotChangesMap();\n  }\n\n  addDocumentChange(key: DocumentKey, changeType: ChangeType): void {\n    this._hasPendingChanges = true;\n    this.documentChanges = this.documentChanges.insert(key, changeType);\n  }\n\n  removeDocumentChange(key: DocumentKey): void {\n    this._hasPendingChanges = true;\n    this.documentChanges = this.documentChanges.remove(key);\n  }\n\n  recordPendingTargetRequest(): void {\n    this.pendingResponses += 1;\n  }\n\n  recordTargetResponse(): void {\n    this.pendingResponses -= 1;\n  }\n\n  markCurrent(): void {\n    this._hasPendingChanges = true;\n    this._current = true;\n  }\n}\n\n/**\n * Interface implemented by RemoteStore to expose target metadata to the\n * WatchChangeAggregator.\n */\nexport interface TargetMetadataProvider {\n  /**\n   * Returns the set of remote document keys for the given target ID as of the\n   * last raised snapshot.\n   */\n  getRemoteKeysForTarget(targetId: TargetId): DocumentKeySet;\n\n  /**\n   * Returns the TargetData for an active target ID or 'null' if this target\n   * has become inactive\n   */\n  getTargetDataForTarget(targetId: TargetId): TargetData | null;\n}\n\nconst LOG_TAG = 'WatchChangeAggregator';\n\n/**\n * A helper class to accumulate watch changes into a RemoteEvent.\n */\nexport class WatchChangeAggregator {\n  constructor(private metadataProvider: TargetMetadataProvider) {}\n\n  /** The internal state of all tracked targets. */\n  private targetStates = new Map<TargetId, TargetState>();\n\n  /** Keeps track of the documents to update since the last raised snapshot. */\n  private pendingDocumentUpdates = maybeDocumentMap();\n\n  /** A mapping of document keys to their set of target IDs. */\n  private pendingDocumentTargetMapping = documentTargetMap();\n\n  /**\n   * A list of targets with existence filter mismatches. These targets are\n   * known to be inconsistent and their listens needs to be re-established by\n   * RemoteStore.\n   */\n  private pendingTargetResets = new SortedSet<TargetId>(primitiveComparator);\n\n  /**\n   * Processes and adds the DocumentWatchChange to the current set of changes.\n   */\n  handleDocumentChange(docChange: DocumentWatchChange): void {\n    for (const targetId of docChange.updatedTargetIds) {\n      if (docChange.newDoc instanceof Document) {\n        this.addDocumentToTarget(targetId, docChange.newDoc);\n      } else if (docChange.newDoc instanceof NoDocument) {\n        this.removeDocumentFromTarget(\n          targetId,\n          docChange.key,\n          docChange.newDoc\n        );\n      }\n    }\n\n    for (const targetId of docChange.removedTargetIds) {\n      this.removeDocumentFromTarget(targetId, docChange.key, docChange.newDoc);\n    }\n  }\n\n  /** Processes and adds the WatchTargetChange to the current set of changes. */\n  handleTargetChange(targetChange: WatchTargetChange): void {\n    this.forEachTarget(targetChange, targetId => {\n      const targetState = this.ensureTargetState(targetId);\n      switch (targetChange.state) {\n        case WatchTargetChangeState.NoChange:\n          if (this.isActiveTarget(targetId)) {\n            targetState.updateResumeToken(targetChange.resumeToken);\n          }\n          break;\n        case WatchTargetChangeState.Added:\n          // We need to decrement the number of pending acks needed from watch\n          // for this targetId.\n          targetState.recordTargetResponse();\n          if (!targetState.isPending) {\n            // We have a freshly added target, so we need to reset any state\n            // that we had previously. This can happen e.g. when remove and add\n            // back a target for existence filter mismatches.\n            targetState.clearPendingChanges();\n          }\n          targetState.updateResumeToken(targetChange.resumeToken);\n          break;\n        case WatchTargetChangeState.Removed:\n          // We need to keep track of removed targets to we can post-filter and\n          // remove any target changes.\n          // We need to decrement the number of pending acks needed from watch\n          // for this targetId.\n          targetState.recordTargetResponse();\n          if (!targetState.isPending) {\n            this.removeTarget(targetId);\n          }\n          debugAssert(\n            !targetChange.cause,\n            'WatchChangeAggregator does not handle errored targets'\n          );\n          break;\n        case WatchTargetChangeState.Current:\n          if (this.isActiveTarget(targetId)) {\n            targetState.markCurrent();\n            targetState.updateResumeToken(targetChange.resumeToken);\n          }\n          break;\n        case WatchTargetChangeState.Reset:\n          if (this.isActiveTarget(targetId)) {\n            // Reset the target and synthesizes removes for all existing\n            // documents. The backend will re-add any documents that still\n            // match the target before it sends the next global snapshot.\n            this.resetTarget(targetId);\n            targetState.updateResumeToken(targetChange.resumeToken);\n          }\n          break;\n        default:\n          fail('Unknown target watch change state: ' + targetChange.state);\n      }\n    });\n  }\n\n  /**\n   * Iterates over all targetIds that the watch change applies to: either the\n   * targetIds explicitly listed in the change or the targetIds of all currently\n   * active targets.\n   */\n  forEachTarget(\n    targetChange: WatchTargetChange,\n    fn: (targetId: TargetId) => void\n  ): void {\n    if (targetChange.targetIds.length > 0) {\n      targetChange.targetIds.forEach(fn);\n    } else {\n      this.targetStates.forEach((_, targetId) => {\n        if (this.isActiveTarget(targetId)) {\n          fn(targetId);\n        }\n      });\n    }\n  }\n\n  /**\n   * Handles existence filters and synthesizes deletes for filter mismatches.\n   * Targets that are invalidated by filter mismatches are added to\n   * `pendingTargetResets`.\n   */\n  handleExistenceFilter(watchChange: ExistenceFilterChange): void {\n    const targetId = watchChange.targetId;\n    const expectedCount = watchChange.existenceFilter.count;\n\n    const targetData = this.targetDataForActiveTarget(targetId);\n    if (targetData) {\n      const target = targetData.target;\n      if (target.isDocumentQuery()) {\n        if (expectedCount === 0) {\n          // The existence filter told us the document does not exist. We deduce\n          // that this document does not exist and apply a deleted document to\n          // our updates. Without applying this deleted document there might be\n          // another query that will raise this document as part of a snapshot\n          // until it is resolved, essentially exposing inconsistency between\n          // queries.\n          const key = new DocumentKey(target.path);\n          this.removeDocumentFromTarget(\n            targetId,\n            key,\n            new NoDocument(key, SnapshotVersion.min())\n          );\n        } else {\n          hardAssert(\n            expectedCount === 1,\n            'Single document existence filter with count: ' + expectedCount\n          );\n        }\n      } else {\n        const currentSize = this.getCurrentDocumentCountForTarget(targetId);\n        if (currentSize !== expectedCount) {\n          // Existence filter mismatch: We reset the mapping and raise a new\n          // snapshot with `isFromCache:true`.\n          this.resetTarget(targetId);\n          this.pendingTargetResets = this.pendingTargetResets.add(targetId);\n        }\n      }\n    }\n  }\n\n  /**\n   * Converts the currently accumulated state into a remote event at the\n   * provided snapshot version. Resets the accumulated changes before returning.\n   */\n  createRemoteEvent(snapshotVersion: SnapshotVersion): RemoteEvent {\n    const targetChanges = new Map<TargetId, TargetChange>();\n\n    this.targetStates.forEach((targetState, targetId) => {\n      const targetData = this.targetDataForActiveTarget(targetId);\n      if (targetData) {\n        if (targetState.current && targetData.target.isDocumentQuery()) {\n          // Document queries for document that don't exist can produce an empty\n          // result set. To update our local cache, we synthesize a document\n          // delete if we have not previously received the document. This\n          // resolves the limbo state of the document, removing it from\n          // limboDocumentRefs.\n          //\n          // TODO(dimond): Ideally we would have an explicit lookup target\n          // instead resulting in an explicit delete message and we could\n          // remove this special logic.\n          const key = new DocumentKey(targetData.target.path);\n          if (\n            this.pendingDocumentUpdates.get(key) === null &&\n            !this.targetContainsDocument(targetId, key)\n          ) {\n            this.removeDocumentFromTarget(\n              targetId,\n              key,\n              new NoDocument(key, snapshotVersion)\n            );\n          }\n        }\n\n        if (targetState.hasPendingChanges) {\n          targetChanges.set(targetId, targetState.toTargetChange());\n          targetState.clearPendingChanges();\n        }\n      }\n    });\n\n    let resolvedLimboDocuments = documentKeySet();\n\n    // We extract the set of limbo-only document updates as the GC logic\n    // special-cases documents that do not appear in the target cache.\n    //\n    // TODO(gsoltis): Expand on this comment once GC is available in the JS\n    // client.\n    this.pendingDocumentTargetMapping.forEach((key, targets) => {\n      let isOnlyLimboTarget = true;\n\n      targets.forEachWhile(targetId => {\n        const targetData = this.targetDataForActiveTarget(targetId);\n        if (\n          targetData &&\n          targetData.purpose !== TargetPurpose.LimboResolution\n        ) {\n          isOnlyLimboTarget = false;\n          return false;\n        }\n\n        return true;\n      });\n\n      if (isOnlyLimboTarget) {\n        resolvedLimboDocuments = resolvedLimboDocuments.add(key);\n      }\n    });\n\n    const remoteEvent = new RemoteEvent(\n      snapshotVersion,\n      targetChanges,\n      this.pendingTargetResets,\n      this.pendingDocumentUpdates,\n      resolvedLimboDocuments\n    );\n\n    this.pendingDocumentUpdates = maybeDocumentMap();\n    this.pendingDocumentTargetMapping = documentTargetMap();\n    this.pendingTargetResets = new SortedSet<TargetId>(primitiveComparator);\n\n    return remoteEvent;\n  }\n\n  /**\n   * Adds the provided document to the internal list of document updates and\n   * its document key to the given target's mapping.\n   */\n  // Visible for testing.\n  addDocumentToTarget(targetId: TargetId, document: MaybeDocument): void {\n    if (!this.isActiveTarget(targetId)) {\n      return;\n    }\n\n    const changeType = this.targetContainsDocument(targetId, document.key)\n      ? ChangeType.Modified\n      : ChangeType.Added;\n\n    const targetState = this.ensureTargetState(targetId);\n    targetState.addDocumentChange(document.key, changeType);\n\n    this.pendingDocumentUpdates = this.pendingDocumentUpdates.insert(\n      document.key,\n      document\n    );\n\n    this.pendingDocumentTargetMapping = this.pendingDocumentTargetMapping.insert(\n      document.key,\n      this.ensureDocumentTargetMapping(document.key).add(targetId)\n    );\n  }\n\n  /**\n   * Removes the provided document from the target mapping. If the\n   * document no longer matches the target, but the document's state is still\n   * known (e.g. we know that the document was deleted or we received the change\n   * that caused the filter mismatch), the new document can be provided\n   * to update the remote document cache.\n   */\n  // Visible for testing.\n  removeDocumentFromTarget(\n    targetId: TargetId,\n    key: DocumentKey,\n    updatedDocument: MaybeDocument | null\n  ): void {\n    if (!this.isActiveTarget(targetId)) {\n      return;\n    }\n\n    const targetState = this.ensureTargetState(targetId);\n    if (this.targetContainsDocument(targetId, key)) {\n      targetState.addDocumentChange(key, ChangeType.Removed);\n    } else {\n      // The document may have entered and left the target before we raised a\n      // snapshot, so we can just ignore the change.\n      targetState.removeDocumentChange(key);\n    }\n\n    this.pendingDocumentTargetMapping = this.pendingDocumentTargetMapping.insert(\n      key,\n      this.ensureDocumentTargetMapping(key).delete(targetId)\n    );\n\n    if (updatedDocument) {\n      this.pendingDocumentUpdates = this.pendingDocumentUpdates.insert(\n        key,\n        updatedDocument\n      );\n    }\n  }\n\n  removeTarget(targetId: TargetId): void {\n    this.targetStates.delete(targetId);\n  }\n\n  /**\n   * Returns the current count of documents in the target. This includes both\n   * the number of documents that the LocalStore considers to be part of the\n   * target as well as any accumulated changes.\n   */\n  private getCurrentDocumentCountForTarget(targetId: TargetId): number {\n    const targetState = this.ensureTargetState(targetId);\n    const targetChange = targetState.toTargetChange();\n    return (\n      this.metadataProvider.getRemoteKeysForTarget(targetId).size +\n      targetChange.addedDocuments.size -\n      targetChange.removedDocuments.size\n    );\n  }\n\n  /**\n   * Increment the number of acks needed from watch before we can consider the\n   * server to be 'in-sync' with the client's active targets.\n   */\n  recordPendingTargetRequest(targetId: TargetId): void {\n    // For each request we get we need to record we need a response for it.\n    const targetState = this.ensureTargetState(targetId);\n    targetState.recordPendingTargetRequest();\n  }\n\n  private ensureTargetState(targetId: TargetId): TargetState {\n    let result = this.targetStates.get(targetId);\n    if (!result) {\n      result = new TargetState();\n      this.targetStates.set(targetId, result);\n    }\n    return result;\n  }\n\n  private ensureDocumentTargetMapping(key: DocumentKey): SortedSet<TargetId> {\n    let targetMapping = this.pendingDocumentTargetMapping.get(key);\n\n    if (!targetMapping) {\n      targetMapping = new SortedSet<TargetId>(primitiveComparator);\n      this.pendingDocumentTargetMapping = this.pendingDocumentTargetMapping.insert(\n        key,\n        targetMapping\n      );\n    }\n\n    return targetMapping;\n  }\n\n  /**\n   * Verifies that the user is still interested in this target (by calling\n   * `getTargetDataForTarget()`) and that we are not waiting for pending ADDs\n   * from watch.\n   */\n  protected isActiveTarget(targetId: TargetId): boolean {\n    const targetActive = this.targetDataForActiveTarget(targetId) !== null;\n    if (!targetActive) {\n      logDebug(LOG_TAG, 'Detected inactive target', targetId);\n    }\n    return targetActive;\n  }\n\n  /**\n   * Returns the TargetData for an active target (i.e. a target that the user\n   * is still interested in that has no outstanding target change requests).\n   */\n  protected targetDataForActiveTarget(targetId: TargetId): TargetData | null {\n    const targetState = this.targetStates.get(targetId);\n    return targetState && targetState.isPending\n      ? null\n      : this.metadataProvider.getTargetDataForTarget(targetId);\n  }\n\n  /**\n   * Resets the state of a Watch target to its initial state (e.g. sets\n   * 'current' to false, clears the resume token and removes its target mapping\n   * from all documents).\n   */\n  private resetTarget(targetId: TargetId): void {\n    debugAssert(\n      !this.targetStates.get(targetId)!.isPending,\n      'Should only reset active targets'\n    );\n    this.targetStates.set(targetId, new TargetState());\n\n    // Trigger removal for any documents currently mapped to this target.\n    // These removals will be part of the initial snapshot if Watch does not\n    // resend these documents.\n    const existingKeys = this.metadataProvider.getRemoteKeysForTarget(targetId);\n    existingKeys.forEach(key => {\n      this.removeDocumentFromTarget(targetId, key, /*updatedDocument=*/ null);\n    });\n  }\n  /**\n   * Returns whether the LocalStore considers the document to be part of the\n   * specified target.\n   */\n  private targetContainsDocument(\n    targetId: TargetId,\n    key: DocumentKey\n  ): boolean {\n    const existingKeys = this.metadataProvider.getRemoteKeysForTarget(targetId);\n    return existingKeys.has(key);\n  }\n}\n\nfunction documentTargetMap(): SortedMap<DocumentKey, SortedSet<TargetId>> {\n  return new SortedMap<DocumentKey, SortedSet<TargetId>>(\n    DocumentKey.comparator\n  );\n}\n\nfunction snapshotChangesMap(): SortedMap<DocumentKey, ChangeType> {\n  return new SortedMap<DocumentKey, ChangeType>(DocumentKey.comparator);\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SortedMap } from '../util/sorted_map';\n\nimport { documentMap } from './collections';\nimport { Document } from './document';\nimport { DocumentComparator } from './document_comparator';\nimport { DocumentKey } from './document_key';\n\n/**\n * DocumentSet is an immutable (copy-on-write) collection that holds documents\n * in order specified by the provided comparator. We always add a document key\n * comparator on top of what is provided to guarantee document equality based on\n * the key.\n */\n\nexport class DocumentSet {\n  /**\n   * Returns an empty copy of the existing DocumentSet, using the same\n   * comparator.\n   */\n  static emptySet(oldSet: DocumentSet): DocumentSet {\n    return new DocumentSet(oldSet.comparator);\n  }\n\n  private comparator: DocumentComparator;\n  private keyedMap: SortedMap<DocumentKey, Document>;\n  private sortedSet: SortedMap<Document, null>;\n\n  /** The default ordering is by key if the comparator is omitted */\n  constructor(comp?: DocumentComparator) {\n    // We are adding document key comparator to the end as it's the only\n    // guaranteed unique property of a document.\n    if (comp) {\n      this.comparator = (d1: Document, d2: Document) =>\n        comp(d1, d2) || DocumentKey.comparator(d1.key, d2.key);\n    } else {\n      this.comparator = (d1: Document, d2: Document) =>\n        DocumentKey.comparator(d1.key, d2.key);\n    }\n\n    this.keyedMap = documentMap();\n    this.sortedSet = new SortedMap<Document, null>(this.comparator);\n  }\n\n  has(key: DocumentKey): boolean {\n    return this.keyedMap.get(key) != null;\n  }\n\n  get(key: DocumentKey): Document | null {\n    return this.keyedMap.get(key);\n  }\n\n  first(): Document | null {\n    return this.sortedSet.minKey();\n  }\n\n  last(): Document | null {\n    return this.sortedSet.maxKey();\n  }\n\n  isEmpty(): boolean {\n    return this.sortedSet.isEmpty();\n  }\n\n  /**\n   * Returns the index of the provided key in the document set, or -1 if the\n   * document key is not present in the set;\n   */\n  indexOf(key: DocumentKey): number {\n    const doc = this.keyedMap.get(key);\n    return doc ? this.sortedSet.indexOf(doc) : -1;\n  }\n\n  get size(): number {\n    return this.sortedSet.size;\n  }\n\n  /** Iterates documents in order defined by \"comparator\" */\n  forEach(cb: (doc: Document) => void): void {\n    this.sortedSet.inorderTraversal((k, v) => {\n      cb(k);\n      return false;\n    });\n  }\n\n  /** Inserts or updates a document with the same key */\n  add(doc: Document): DocumentSet {\n    // First remove the element if we have it.\n    const set = this.delete(doc.key);\n    return set.copy(\n      set.keyedMap.insert(doc.key, doc),\n      set.sortedSet.insert(doc, null)\n    );\n  }\n\n  /** Deletes a document with a given key */\n  delete(key: DocumentKey): DocumentSet {\n    const doc = this.get(key);\n    if (!doc) {\n      return this;\n    }\n\n    return this.copy(this.keyedMap.remove(key), this.sortedSet.remove(doc));\n  }\n\n  isEqual(other: DocumentSet | null | undefined): boolean {\n    if (!(other instanceof DocumentSet)) {\n      return false;\n    }\n    if (this.size !== other.size) {\n      return false;\n    }\n\n    const thisIt = this.sortedSet.getIterator();\n    const otherIt = other.sortedSet.getIterator();\n    while (thisIt.hasNext()) {\n      const thisDoc = thisIt.getNext().key;\n      const otherDoc = otherIt.getNext().key;\n      if (!thisDoc.isEqual(otherDoc)) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  toString(): string {\n    const docStrings: string[] = [];\n    this.forEach(doc => {\n      docStrings.push(doc.toString());\n    });\n    if (docStrings.length === 0) {\n      return 'DocumentSet ()';\n    } else {\n      return 'DocumentSet (\\n  ' + docStrings.join('  \\n') + '\\n)';\n    }\n  }\n\n  private copy(\n    keyedMap: SortedMap<DocumentKey, Document>,\n    sortedSet: SortedMap<Document, null>\n  ): DocumentSet {\n    const newSet = new DocumentSet();\n    newSet.comparator = this.comparator;\n    newSet.keyedMap = keyedMap;\n    newSet.sortedSet = sortedSet;\n    return newSet;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Document } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { DocumentSet } from '../model/document_set';\nimport { fail } from '../util/assert';\nimport { SortedMap } from '../util/sorted_map';\n\nimport { DocumentKeySet } from '../model/collections';\nimport { Query } from './query';\n\nexport const enum ChangeType {\n  Added,\n  Removed,\n  Modified,\n  Metadata\n}\n\nexport interface DocumentViewChange {\n  type: ChangeType;\n  doc: Document;\n}\n\nexport const enum SyncState {\n  Local,\n  Synced\n}\n\n/**\n * DocumentChangeSet keeps track of a set of changes to docs in a query, merging\n * duplicate events for the same doc.\n */\nexport class DocumentChangeSet {\n  private changeMap = new SortedMap<DocumentKey, DocumentViewChange>(\n    DocumentKey.comparator\n  );\n\n  track(change: DocumentViewChange): void {\n    const key = change.doc.key;\n    const oldChange = this.changeMap.get(key);\n    if (!oldChange) {\n      this.changeMap = this.changeMap.insert(key, change);\n      return;\n    }\n\n    // Merge the new change with the existing change.\n    if (\n      change.type !== ChangeType.Added &&\n      oldChange.type === ChangeType.Metadata\n    ) {\n      this.changeMap = this.changeMap.insert(key, change);\n    } else if (\n      change.type === ChangeType.Metadata &&\n      oldChange.type !== ChangeType.Removed\n    ) {\n      this.changeMap = this.changeMap.insert(key, {\n        type: oldChange.type,\n        doc: change.doc\n      });\n    } else if (\n      change.type === ChangeType.Modified &&\n      oldChange.type === ChangeType.Modified\n    ) {\n      this.changeMap = this.changeMap.insert(key, {\n        type: ChangeType.Modified,\n        doc: change.doc\n      });\n    } else if (\n      change.type === ChangeType.Modified &&\n      oldChange.type === ChangeType.Added\n    ) {\n      this.changeMap = this.changeMap.insert(key, {\n        type: ChangeType.Added,\n        doc: change.doc\n      });\n    } else if (\n      change.type === ChangeType.Removed &&\n      oldChange.type === ChangeType.Added\n    ) {\n      this.changeMap = this.changeMap.remove(key);\n    } else if (\n      change.type === ChangeType.Removed &&\n      oldChange.type === ChangeType.Modified\n    ) {\n      this.changeMap = this.changeMap.insert(key, {\n        type: ChangeType.Removed,\n        doc: oldChange.doc\n      });\n    } else if (\n      change.type === ChangeType.Added &&\n      oldChange.type === ChangeType.Removed\n    ) {\n      this.changeMap = this.changeMap.insert(key, {\n        type: ChangeType.Modified,\n        doc: change.doc\n      });\n    } else {\n      // This includes these cases, which don't make sense:\n      // Added->Added\n      // Removed->Removed\n      // Modified->Added\n      // Removed->Modified\n      // Metadata->Added\n      // Removed->Metadata\n      fail(\n        'unsupported combination of changes: ' +\n          JSON.stringify(change) +\n          ' after ' +\n          JSON.stringify(oldChange)\n      );\n    }\n  }\n\n  getChanges(): DocumentViewChange[] {\n    const changes: DocumentViewChange[] = [];\n    this.changeMap.inorderTraversal(\n      (key: DocumentKey, change: DocumentViewChange) => {\n        changes.push(change);\n      }\n    );\n    return changes;\n  }\n}\n\nexport class ViewSnapshot {\n  constructor(\n    readonly query: Query,\n    readonly docs: DocumentSet,\n    readonly oldDocs: DocumentSet,\n    readonly docChanges: DocumentViewChange[],\n    readonly mutatedKeys: DocumentKeySet,\n    readonly fromCache: boolean,\n    readonly syncStateChanged: boolean,\n    readonly excludesMetadataChanges: boolean\n  ) {}\n\n  /** Returns a view snapshot as if all documents in the snapshot were added. */\n  static fromInitialDocuments(\n    query: Query,\n    documents: DocumentSet,\n    mutatedKeys: DocumentKeySet,\n    fromCache: boolean\n  ): ViewSnapshot {\n    const changes: DocumentViewChange[] = [];\n    documents.forEach(doc => {\n      changes.push({ type: ChangeType.Added, doc });\n    });\n\n    return new ViewSnapshot(\n      query,\n      documents,\n      DocumentSet.emptySet(documents),\n      changes,\n      mutatedKeys,\n      fromCache,\n      /* syncStateChanged= */ true,\n      /* excludesMetadataChanges= */ false\n    );\n  }\n\n  get hasPendingWrites(): boolean {\n    return !this.mutatedKeys.isEmpty();\n  }\n\n  isEqual(other: ViewSnapshot): boolean {\n    if (\n      this.fromCache !== other.fromCache ||\n      this.syncStateChanged !== other.syncStateChanged ||\n      !this.mutatedKeys.isEqual(other.mutatedKeys) ||\n      !this.query.isEqual(other.query) ||\n      !this.docs.isEqual(other.docs) ||\n      !this.oldDocs.isEqual(other.oldDocs)\n    ) {\n      return false;\n    }\n    const changes: DocumentViewChange[] = this.docChanges;\n    const otherChanges: DocumentViewChange[] = other.docChanges;\n    if (changes.length !== otherChanges.length) {\n      return false;\n    }\n    for (let i = 0; i < changes.length; i++) {\n      if (\n        changes[i].type !== otherChanges[i].type ||\n        !changes[i].doc.isEqual(otherChanges[i].doc)\n      ) {\n        return false;\n      }\n    }\n    return true;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { TargetId } from '../core/types';\nimport {\n  documentKeySet,\n  DocumentKeySet,\n  maybeDocumentMap,\n  MaybeDocumentMap,\n  targetIdSet\n} from '../model/collections';\nimport { SortedSet } from '../util/sorted_set';\nimport { ByteString } from '../util/byte_string';\n\n/**\n * An event from the RemoteStore. It is split into targetChanges (changes to the\n * state or the set of documents in our watched targets) and documentUpdates\n * (changes to the actual documents).\n */\nexport class RemoteEvent {\n  constructor(\n    /**\n     * The snapshot version this event brings us up to, or MIN if not set.\n     */\n    readonly snapshotVersion: SnapshotVersion,\n    /**\n     * A map from target to changes to the target. See TargetChange.\n     */\n    readonly targetChanges: Map<TargetId, TargetChange>,\n    /**\n     * A set of targets that is known to be inconsistent. Listens for these\n     * targets should be re-established without resume tokens.\n     */\n    readonly targetMismatches: SortedSet<TargetId>,\n    /**\n     * A set of which documents have changed or been deleted, along with the\n     * doc's new values (if not deleted).\n     */\n    readonly documentUpdates: MaybeDocumentMap,\n    /**\n     * A set of which document updates are due only to limbo resolution targets.\n     */\n    readonly resolvedLimboDocuments: DocumentKeySet\n  ) {}\n\n  /**\n   * HACK: Views require RemoteEvents in order to determine whether the view is\n   * CURRENT, but secondary tabs don't receive remote events. So this method is\n   * used to create a synthesized RemoteEvent that can be used to apply a\n   * CURRENT status change to a View, for queries executed in a different tab.\n   */\n  // PORTING NOTE: Multi-tab only\n  static createSynthesizedRemoteEventForCurrentChange(\n    targetId: TargetId,\n    current: boolean\n  ): RemoteEvent {\n    const targetChanges = new Map<TargetId, TargetChange>();\n    targetChanges.set(\n      targetId,\n      TargetChange.createSynthesizedTargetChangeForCurrentChange(\n        targetId,\n        current\n      )\n    );\n    return new RemoteEvent(\n      SnapshotVersion.min(),\n      targetChanges,\n      targetIdSet(),\n      maybeDocumentMap(),\n      documentKeySet()\n    );\n  }\n}\n\n/**\n * A TargetChange specifies the set of changes for a specific target as part of\n * a RemoteEvent. These changes track which documents are added, modified or\n * removed, as well as the target's resume token and whether the target is\n * marked CURRENT.\n * The actual changes *to* documents are not part of the TargetChange since\n * documents may be part of multiple targets.\n */\nexport class TargetChange {\n  constructor(\n    /**\n     * An opaque, server-assigned token that allows watching a query to be resumed\n     * after disconnecting without retransmitting all the data that matches the\n     * query. The resume token essentially identifies a point in time from which\n     * the server should resume sending results.\n     */\n    readonly resumeToken: ByteString,\n    /**\n     * The \"current\" (synced) status of this target. Note that \"current\"\n     * has special meaning in the RPC protocol that implies that a target is\n     * both up-to-date and consistent with the rest of the watch stream.\n     */\n    readonly current: boolean,\n    /**\n     * The set of documents that were newly assigned to this target as part of\n     * this remote event.\n     */\n    readonly addedDocuments: DocumentKeySet,\n    /**\n     * The set of documents that were already assigned to this target but received\n     * an update during this remote event.\n     */\n    readonly modifiedDocuments: DocumentKeySet,\n    /**\n     * The set of documents that were removed from this target as part of this\n     * remote event.\n     */\n    readonly removedDocuments: DocumentKeySet\n  ) {}\n\n  /**\n   * This method is used to create a synthesized TargetChanges that can be used to\n   * apply a CURRENT status change to a View (for queries executed in a different\n   * tab) or for new queries (to raise snapshots with correct CURRENT status).\n   */\n  static createSynthesizedTargetChangeForCurrentChange(\n    targetId: TargetId,\n    current: boolean\n  ): TargetChange {\n    return new TargetChange(\n      ByteString.EMPTY_BYTE_STRING,\n      current,\n      documentKeySet(),\n      documentKeySet(),\n      documentKeySet()\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Blob } from '../api/blob';\nimport { Timestamp } from '../api/timestamp';\nimport { DatabaseId } from '../core/database_info';\nimport {\n  Bound,\n  Direction,\n  FieldFilter,\n  Filter,\n  LimitType,\n  Operator,\n  OrderBy,\n  Query\n} from '../core/query';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { Target } from '../core/target';\nimport { TargetId } from '../core/types';\nimport { TargetData, TargetPurpose } from '../local/target_data';\nimport { Document, MaybeDocument, NoDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { ObjectValue } from '../model/object_value';\nimport {\n  DeleteMutation,\n  FieldMask,\n  FieldTransform,\n  Mutation,\n  MutationResult,\n  PatchMutation,\n  Precondition,\n  SetMutation,\n  TransformMutation,\n  VerifyMutation\n} from '../model/mutation';\nimport { FieldPath, ResourcePath } from '../model/path';\nimport * as api from '../protos/firestore_proto_api';\nimport { debugAssert, fail, hardAssert } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { ByteString } from '../util/byte_string';\nimport {\n  isNegativeZero,\n  isNullOrUndefined,\n  isSafeInteger\n} from '../util/types';\nimport {\n  ArrayRemoveTransformOperation,\n  ArrayUnionTransformOperation,\n  NumericIncrementTransformOperation,\n  ServerTimestampTransform,\n  TransformOperation\n} from '../model/transform_operation';\nimport { ExistenceFilter } from './existence_filter';\nimport { mapCodeFromRpcCode } from './rpc_error';\nimport {\n  DocumentWatchChange,\n  ExistenceFilterChange,\n  WatchChange,\n  WatchTargetChange,\n  WatchTargetChangeState\n} from './watch_change';\nimport { isNanValue, isNullValue, normalizeTimestamp } from '../model/values';\n\nconst DIRECTIONS = (() => {\n  const dirs: { [dir: string]: api.OrderDirection } = {};\n  dirs[Direction.ASCENDING] = 'ASCENDING';\n  dirs[Direction.DESCENDING] = 'DESCENDING';\n  return dirs;\n})();\n\nconst OPERATORS = (() => {\n  const ops: { [op: string]: api.FieldFilterOp } = {};\n  ops[Operator.LESS_THAN] = 'LESS_THAN';\n  ops[Operator.LESS_THAN_OR_EQUAL] = 'LESS_THAN_OR_EQUAL';\n  ops[Operator.GREATER_THAN] = 'GREATER_THAN';\n  ops[Operator.GREATER_THAN_OR_EQUAL] = 'GREATER_THAN_OR_EQUAL';\n  ops[Operator.EQUAL] = 'EQUAL';\n  ops[Operator.ARRAY_CONTAINS] = 'ARRAY_CONTAINS';\n  ops[Operator.IN] = 'IN';\n  ops[Operator.ARRAY_CONTAINS_ANY] = 'ARRAY_CONTAINS_ANY';\n  return ops;\n})();\n\nfunction assertPresent(value: unknown, description: string): asserts value {\n  debugAssert(!isNullOrUndefined(value), description + ' is missing');\n}\n\nexport interface SerializerOptions {\n  /**\n   * The serializer supports both Protobuf.js and Proto3 JSON formats. By\n   * setting this flag to true, the serializer will use the Proto3 JSON format.\n   *\n   * For a description of the Proto3 JSON format check\n   * https://developers.google.com/protocol-buffers/docs/proto3#json\n   */\n  useProto3Json: boolean;\n}\n\n/**\n * Generates JsonObject values for the Datastore API suitable for sending to\n * either GRPC stub methods or via the JSON/HTTP REST API.\n * TODO(klimt): We can remove the databaseId argument if we keep the full\n * resource name in documents.\n */\nexport class JsonProtoSerializer {\n  constructor(\n    private databaseId: DatabaseId,\n    private options: SerializerOptions\n  ) {}\n\n  fromRpcStatus(status: api.Status): FirestoreError {\n    const code =\n      status.code === undefined\n        ? Code.UNKNOWN\n        : mapCodeFromRpcCode(status.code);\n    return new FirestoreError(code, status.message || '');\n  }\n\n  /**\n   * Returns a value for a number (or null) that's appropriate to put into\n   * a google.protobuf.Int32Value proto.\n   * DO NOT USE THIS FOR ANYTHING ELSE.\n   * This method cheats. It's typed as returning \"number\" because that's what\n   * our generated proto interfaces say Int32Value must be. But GRPC actually\n   * expects a { value: <number> } struct.\n   */\n  private toInt32Proto(val: number | null): number | { value: number } | null {\n    if (this.options.useProto3Json || isNullOrUndefined(val)) {\n      return val;\n    } else {\n      return { value: val };\n    }\n  }\n\n  /**\n   * Returns a number (or null) from a google.protobuf.Int32Value proto.\n   */\n  private fromInt32Proto(\n    val: number | { value: number } | undefined\n  ): number | null {\n    let result;\n    if (typeof val === 'object') {\n      result = val.value;\n    } else {\n      result = val;\n    }\n    return isNullOrUndefined(result) ? null : result;\n  }\n\n  /**\n   * Returns an IntegerValue for `value`.\n   */\n  toInteger(value: number): api.Value {\n    return { integerValue: '' + value };\n  }\n\n  /**\n   * Returns an DoubleValue for `value` that is encoded based the serializer's\n   * `useProto3Json` setting.\n   */\n  toDouble(value: number): api.Value {\n    if (this.options.useProto3Json) {\n      if (isNaN(value)) {\n        return { doubleValue: 'NaN' };\n      } else if (value === Infinity) {\n        return { doubleValue: 'Infinity' };\n      } else if (value === -Infinity) {\n        return { doubleValue: '-Infinity' };\n      }\n    }\n    return { doubleValue: isNegativeZero(value) ? '-0' : value };\n  }\n\n  /**\n   * Returns a value for a number that's appropriate to put into a proto.\n   * The return value is an IntegerValue if it can safely represent the value,\n   * otherwise a DoubleValue is returned.\n   */\n  toNumber(value: number): api.Value {\n    return isSafeInteger(value) ? this.toInteger(value) : this.toDouble(value);\n  }\n\n  /**\n   * Returns a value for a Date that's appropriate to put into a proto.\n   */\n  toTimestamp(timestamp: Timestamp): api.Timestamp {\n    if (this.options.useProto3Json) {\n      // Serialize to ISO-8601 date format, but with full nano resolution.\n      // Since JS Date has only millis, let's only use it for the seconds and\n      // then manually add the fractions to the end.\n      const jsDateStr = new Date(timestamp.seconds * 1000).toISOString();\n      // Remove .xxx frac part and Z in the end.\n      const strUntilSeconds = jsDateStr.replace(/\\.\\d*/, '').replace('Z', '');\n      // Pad the fraction out to 9 digits (nanos).\n      const nanoStr = ('000000000' + timestamp.nanoseconds).slice(-9);\n\n      return `${strUntilSeconds}.${nanoStr}Z`;\n    } else {\n      return {\n        seconds: '' + timestamp.seconds,\n        nanos: timestamp.nanoseconds\n        // eslint-disable-next-line @typescript-eslint/no-explicit-any\n      } as any;\n    }\n  }\n\n  private fromTimestamp(date: api.Timestamp): Timestamp {\n    const timestamp = normalizeTimestamp(date);\n    return new Timestamp(timestamp.seconds, timestamp.nanos);\n  }\n\n  /**\n   * Returns a value for bytes that's appropriate to put in a proto.\n   *\n   * Visible for testing.\n   */\n  toBytes(bytes: Blob | ByteString): string | Uint8Array {\n    if (this.options.useProto3Json) {\n      return bytes.toBase64();\n    } else {\n      return bytes.toUint8Array();\n    }\n  }\n\n  /**\n   * Returns a ByteString based on the proto string value.\n   */\n  fromBytes(value: string | Uint8Array | undefined): ByteString {\n    if (this.options.useProto3Json) {\n      hardAssert(\n        value === undefined || typeof value === 'string',\n        'value must be undefined or a string when using proto3 Json'\n      );\n      return ByteString.fromBase64String(value ? value : '');\n    } else {\n      hardAssert(\n        value === undefined || value instanceof Uint8Array,\n        'value must be undefined or Uint8Array'\n      );\n      return ByteString.fromUint8Array(value ? value : new Uint8Array());\n    }\n  }\n\n  toVersion(version: SnapshotVersion): api.Timestamp {\n    return this.toTimestamp(version.toTimestamp());\n  }\n\n  fromVersion(version: api.Timestamp): SnapshotVersion {\n    hardAssert(!!version, \"Trying to deserialize version that isn't set\");\n    return SnapshotVersion.fromTimestamp(this.fromTimestamp(version));\n  }\n\n  toResourceName(path: ResourcePath, databaseId?: DatabaseId): string {\n    return this.fullyQualifiedPrefixPath(databaseId || this.databaseId)\n      .child('documents')\n      .child(path)\n      .canonicalString();\n  }\n\n  fromResourceName(name: string): ResourcePath {\n    const resource = ResourcePath.fromString(name);\n    hardAssert(\n      isValidResourceName(resource),\n      'Tried to deserialize invalid key ' + resource.toString()\n    );\n    return resource;\n  }\n\n  toName(key: DocumentKey): string {\n    return this.toResourceName(key.path);\n  }\n\n  fromName(name: string): DocumentKey {\n    const resource = this.fromResourceName(name);\n    hardAssert(\n      resource.get(1) === this.databaseId.projectId,\n      'Tried to deserialize key from different project: ' +\n        resource.get(1) +\n        ' vs ' +\n        this.databaseId.projectId\n    );\n    hardAssert(\n      (!resource.get(3) && !this.databaseId.database) ||\n        resource.get(3) === this.databaseId.database,\n      'Tried to deserialize key from different database: ' +\n        resource.get(3) +\n        ' vs ' +\n        this.databaseId.database\n    );\n    return new DocumentKey(this.extractLocalPathFromResourceName(resource));\n  }\n\n  toQueryPath(path: ResourcePath): string {\n    return this.toResourceName(path);\n  }\n\n  fromQueryPath(name: string): ResourcePath {\n    const resourceName = this.fromResourceName(name);\n    // In v1beta1 queries for collections at the root did not have a trailing\n    // \"/documents\". In v1 all resource paths contain \"/documents\". Preserve the\n    // ability to read the v1beta1 form for compatibility with queries persisted\n    // in the local target cache.\n    if (resourceName.length === 4) {\n      return ResourcePath.EMPTY_PATH;\n    }\n    return this.extractLocalPathFromResourceName(resourceName);\n  }\n\n  get encodedDatabaseId(): string {\n    const path = new ResourcePath([\n      'projects',\n      this.databaseId.projectId,\n      'databases',\n      this.databaseId.database\n    ]);\n    return path.canonicalString();\n  }\n\n  private fullyQualifiedPrefixPath(databaseId: DatabaseId): ResourcePath {\n    return new ResourcePath([\n      'projects',\n      databaseId.projectId,\n      'databases',\n      databaseId.database\n    ]);\n  }\n\n  private extractLocalPathFromResourceName(\n    resourceName: ResourcePath\n  ): ResourcePath {\n    hardAssert(\n      resourceName.length > 4 && resourceName.get(4) === 'documents',\n      'tried to deserialize invalid key ' + resourceName.toString()\n    );\n    return resourceName.popFirst(5);\n  }\n\n  /** Creates an api.Document from key and fields (but no create/update time) */\n  toMutationDocument(key: DocumentKey, fields: ObjectValue): api.Document {\n    return {\n      name: this.toName(key),\n      fields: fields.proto.mapValue.fields\n    };\n  }\n\n  toDocument(document: Document): api.Document {\n    debugAssert(\n      !document.hasLocalMutations,\n      \"Can't serialize documents with mutations.\"\n    );\n    return {\n      name: this.toName(document.key),\n      fields: document.toProto().mapValue.fields,\n      updateTime: this.toTimestamp(document.version.toTimestamp())\n    };\n  }\n\n  fromDocument(\n    document: api.Document,\n    hasCommittedMutations?: boolean\n  ): Document {\n    const key = this.fromName(document.name!);\n    const version = this.fromVersion(document.updateTime!);\n    const data = new ObjectValue({ mapValue: { fields: document.fields } });\n    return new Document(key, version, data, {\n      hasCommittedMutations: !!hasCommittedMutations\n    });\n  }\n\n  private fromFound(doc: api.BatchGetDocumentsResponse): Document {\n    hardAssert(\n      !!doc.found,\n      'Tried to deserialize a found document from a missing document.'\n    );\n    assertPresent(doc.found.name, 'doc.found.name');\n    assertPresent(doc.found.updateTime, 'doc.found.updateTime');\n    const key = this.fromName(doc.found.name);\n    const version = this.fromVersion(doc.found.updateTime);\n    const data = new ObjectValue({ mapValue: { fields: doc.found.fields } });\n    return new Document(key, version, data, {});\n  }\n\n  private fromMissing(result: api.BatchGetDocumentsResponse): NoDocument {\n    hardAssert(\n      !!result.missing,\n      'Tried to deserialize a missing document from a found document.'\n    );\n    hardAssert(\n      !!result.readTime,\n      'Tried to deserialize a missing document without a read time.'\n    );\n    const key = this.fromName(result.missing);\n    const version = this.fromVersion(result.readTime);\n    return new NoDocument(key, version);\n  }\n\n  fromMaybeDocument(result: api.BatchGetDocumentsResponse): MaybeDocument {\n    if ('found' in result) {\n      return this.fromFound(result);\n    } else if ('missing' in result) {\n      return this.fromMissing(result);\n    }\n    return fail('invalid batch get response: ' + JSON.stringify(result));\n  }\n\n  fromWatchChange(change: api.ListenResponse): WatchChange {\n    let watchChange: WatchChange;\n    if ('targetChange' in change) {\n      assertPresent(change.targetChange, 'targetChange');\n      // proto3 default value is unset in JSON (undefined), so use 'NO_CHANGE'\n      // if unset\n      const state = this.fromWatchTargetChangeState(\n        change.targetChange.targetChangeType || 'NO_CHANGE'\n      );\n      const targetIds: TargetId[] = change.targetChange.targetIds || [];\n\n      const resumeToken = this.fromBytes(change.targetChange.resumeToken);\n      const causeProto = change.targetChange!.cause;\n      const cause = causeProto && this.fromRpcStatus(causeProto);\n      watchChange = new WatchTargetChange(\n        state,\n        targetIds,\n        resumeToken,\n        cause || null\n      );\n    } else if ('documentChange' in change) {\n      assertPresent(change.documentChange, 'documentChange');\n      const entityChange = change.documentChange;\n      assertPresent(entityChange.document, 'documentChange.name');\n      assertPresent(entityChange.document.name, 'documentChange.document.name');\n      assertPresent(\n        entityChange.document.updateTime,\n        'documentChange.document.updateTime'\n      );\n      const key = this.fromName(entityChange.document.name);\n      const version = this.fromVersion(entityChange.document.updateTime);\n      const data = new ObjectValue({\n        mapValue: { fields: entityChange.document.fields }\n      });\n      const doc = new Document(key, version, data, {});\n      const updatedTargetIds = entityChange.targetIds || [];\n      const removedTargetIds = entityChange.removedTargetIds || [];\n      watchChange = new DocumentWatchChange(\n        updatedTargetIds,\n        removedTargetIds,\n        doc.key,\n        doc\n      );\n    } else if ('documentDelete' in change) {\n      assertPresent(change.documentDelete, 'documentDelete');\n      const docDelete = change.documentDelete;\n      assertPresent(docDelete.document, 'documentDelete.document');\n      const key = this.fromName(docDelete.document);\n      const version = docDelete.readTime\n        ? this.fromVersion(docDelete.readTime)\n        : SnapshotVersion.min();\n      const doc = new NoDocument(key, version);\n      const removedTargetIds = docDelete.removedTargetIds || [];\n      watchChange = new DocumentWatchChange([], removedTargetIds, doc.key, doc);\n    } else if ('documentRemove' in change) {\n      assertPresent(change.documentRemove, 'documentRemove');\n      const docRemove = change.documentRemove;\n      assertPresent(docRemove.document, 'documentRemove');\n      const key = this.fromName(docRemove.document);\n      const removedTargetIds = docRemove.removedTargetIds || [];\n      watchChange = new DocumentWatchChange([], removedTargetIds, key, null);\n    } else if ('filter' in change) {\n      // TODO(dimond): implement existence filter parsing with strategy.\n      assertPresent(change.filter, 'filter');\n      const filter = change.filter;\n      assertPresent(filter.targetId, 'filter.targetId');\n      const count = filter.count || 0;\n      const existenceFilter = new ExistenceFilter(count);\n      const targetId = filter.targetId;\n      watchChange = new ExistenceFilterChange(targetId, existenceFilter);\n    } else {\n      return fail('Unknown change type ' + JSON.stringify(change));\n    }\n    return watchChange;\n  }\n\n  fromWatchTargetChangeState(\n    state: api.TargetChangeTargetChangeType\n  ): WatchTargetChangeState {\n    if (state === 'NO_CHANGE') {\n      return WatchTargetChangeState.NoChange;\n    } else if (state === 'ADD') {\n      return WatchTargetChangeState.Added;\n    } else if (state === 'REMOVE') {\n      return WatchTargetChangeState.Removed;\n    } else if (state === 'CURRENT') {\n      return WatchTargetChangeState.Current;\n    } else if (state === 'RESET') {\n      return WatchTargetChangeState.Reset;\n    } else {\n      return fail('Got unexpected TargetChange.state: ' + state);\n    }\n  }\n\n  versionFromListenResponse(change: api.ListenResponse): SnapshotVersion {\n    // We have only reached a consistent snapshot for the entire stream if there\n    // is a read_time set and it applies to all targets (i.e. the list of\n    // targets is empty). The backend is guaranteed to send such responses.\n    if (!('targetChange' in change)) {\n      return SnapshotVersion.min();\n    }\n    const targetChange = change.targetChange!;\n    if (targetChange.targetIds && targetChange.targetIds.length) {\n      return SnapshotVersion.min();\n    }\n    if (!targetChange.readTime) {\n      return SnapshotVersion.min();\n    }\n    return this.fromVersion(targetChange.readTime);\n  }\n\n  toMutation(mutation: Mutation): api.Write {\n    let result: api.Write;\n    if (mutation instanceof SetMutation) {\n      result = {\n        update: this.toMutationDocument(mutation.key, mutation.value)\n      };\n    } else if (mutation instanceof DeleteMutation) {\n      result = { delete: this.toName(mutation.key) };\n    } else if (mutation instanceof PatchMutation) {\n      result = {\n        update: this.toMutationDocument(mutation.key, mutation.data),\n        updateMask: this.toDocumentMask(mutation.fieldMask)\n      };\n    } else if (mutation instanceof TransformMutation) {\n      result = {\n        transform: {\n          document: this.toName(mutation.key),\n          fieldTransforms: mutation.fieldTransforms.map(transform =>\n            this.toFieldTransform(transform)\n          )\n        }\n      };\n    } else if (mutation instanceof VerifyMutation) {\n      result = {\n        verify: this.toName(mutation.key)\n      };\n    } else {\n      return fail('Unknown mutation type ' + mutation.type);\n    }\n\n    if (!mutation.precondition.isNone) {\n      result.currentDocument = this.toPrecondition(mutation.precondition);\n    }\n\n    return result;\n  }\n\n  fromMutation(proto: api.Write): Mutation {\n    const precondition = proto.currentDocument\n      ? this.fromPrecondition(proto.currentDocument)\n      : Precondition.none();\n\n    if (proto.update) {\n      assertPresent(proto.update.name, 'name');\n      const key = this.fromName(proto.update.name);\n      const value = new ObjectValue({\n        mapValue: { fields: proto.update.fields }\n      });\n      if (proto.updateMask) {\n        const fieldMask = this.fromDocumentMask(proto.updateMask);\n        return new PatchMutation(key, value, fieldMask, precondition);\n      } else {\n        return new SetMutation(key, value, precondition);\n      }\n    } else if (proto.delete) {\n      const key = this.fromName(proto.delete);\n      return new DeleteMutation(key, precondition);\n    } else if (proto.transform) {\n      const key = this.fromName(proto.transform.document!);\n      const fieldTransforms = proto.transform.fieldTransforms!.map(transform =>\n        this.fromFieldTransform(transform)\n      );\n      hardAssert(\n        precondition.exists === true,\n        'Transforms only support precondition \"exists == true\"'\n      );\n      return new TransformMutation(key, fieldTransforms);\n    } else if (proto.verify) {\n      const key = this.fromName(proto.verify);\n      return new VerifyMutation(key, precondition);\n    } else {\n      return fail('unknown mutation proto: ' + JSON.stringify(proto));\n    }\n  }\n\n  private toPrecondition(precondition: Precondition): api.Precondition {\n    debugAssert(!precondition.isNone, \"Can't serialize an empty precondition\");\n    if (precondition.updateTime !== undefined) {\n      return {\n        updateTime: this.toVersion(precondition.updateTime)\n      };\n    } else if (precondition.exists !== undefined) {\n      return { exists: precondition.exists };\n    } else {\n      return fail('Unknown precondition');\n    }\n  }\n\n  private fromPrecondition(precondition: api.Precondition): Precondition {\n    if (precondition.updateTime !== undefined) {\n      return Precondition.updateTime(this.fromVersion(precondition.updateTime));\n    } else if (precondition.exists !== undefined) {\n      return Precondition.exists(precondition.exists);\n    } else {\n      return Precondition.none();\n    }\n  }\n\n  private fromWriteResult(\n    proto: api.WriteResult,\n    commitTime: api.Timestamp\n  ): MutationResult {\n    // NOTE: Deletes don't have an updateTime.\n    let version = proto.updateTime\n      ? this.fromVersion(proto.updateTime)\n      : this.fromVersion(commitTime);\n\n    if (version.isEqual(SnapshotVersion.min())) {\n      // The Firestore Emulator currently returns an update time of 0 for\n      // deletes of non-existing documents (rather than null). This breaks the\n      // test \"get deleted doc while offline with source=cache\" as NoDocuments\n      // with version 0 are filtered by IndexedDb's RemoteDocumentCache.\n      // TODO(#2149): Remove this when Emulator is fixed\n      version = this.fromVersion(commitTime);\n    }\n\n    let transformResults: api.Value[] | null = null;\n    if (proto.transformResults && proto.transformResults.length > 0) {\n      transformResults = proto.transformResults;\n    }\n    return new MutationResult(version, transformResults);\n  }\n\n  fromWriteResults(\n    protos: api.WriteResult[] | undefined,\n    commitTime?: api.Timestamp\n  ): MutationResult[] {\n    if (protos && protos.length > 0) {\n      hardAssert(\n        commitTime !== undefined,\n        'Received a write result without a commit time'\n      );\n      return protos.map(proto => this.fromWriteResult(proto, commitTime));\n    } else {\n      return [];\n    }\n  }\n\n  private toFieldTransform(fieldTransform: FieldTransform): api.FieldTransform {\n    const transform = fieldTransform.transform;\n    if (transform instanceof ServerTimestampTransform) {\n      return {\n        fieldPath: fieldTransform.field.canonicalString(),\n        setToServerValue: 'REQUEST_TIME'\n      };\n    } else if (transform instanceof ArrayUnionTransformOperation) {\n      return {\n        fieldPath: fieldTransform.field.canonicalString(),\n        appendMissingElements: {\n          values: transform.elements\n        }\n      };\n    } else if (transform instanceof ArrayRemoveTransformOperation) {\n      return {\n        fieldPath: fieldTransform.field.canonicalString(),\n        removeAllFromArray: {\n          values: transform.elements\n        }\n      };\n    } else if (transform instanceof NumericIncrementTransformOperation) {\n      return {\n        fieldPath: fieldTransform.field.canonicalString(),\n        increment: transform.operand\n      };\n    } else {\n      throw fail('Unknown transform: ' + fieldTransform.transform);\n    }\n  }\n\n  private fromFieldTransform(proto: api.FieldTransform): FieldTransform {\n    let transform: TransformOperation | null = null;\n    if ('setToServerValue' in proto) {\n      hardAssert(\n        proto.setToServerValue === 'REQUEST_TIME',\n        'Unknown server value transform proto: ' + JSON.stringify(proto)\n      );\n      transform = ServerTimestampTransform.instance;\n    } else if ('appendMissingElements' in proto) {\n      const values = proto.appendMissingElements!.values || [];\n      transform = new ArrayUnionTransformOperation(values);\n    } else if ('removeAllFromArray' in proto) {\n      const values = proto.removeAllFromArray!.values || [];\n      transform = new ArrayRemoveTransformOperation(values);\n    } else if ('increment' in proto) {\n      transform = new NumericIncrementTransformOperation(\n        this,\n        proto.increment!\n      );\n    } else {\n      fail('Unknown transform proto: ' + JSON.stringify(proto));\n    }\n    const fieldPath = FieldPath.fromServerFormat(proto.fieldPath!);\n    return new FieldTransform(fieldPath, transform!);\n  }\n\n  toDocumentsTarget(target: Target): api.DocumentsTarget {\n    return { documents: [this.toQueryPath(target.path)] };\n  }\n\n  fromDocumentsTarget(documentsTarget: api.DocumentsTarget): Target {\n    const count = documentsTarget.documents!.length;\n    hardAssert(\n      count === 1,\n      'DocumentsTarget contained other than 1 document: ' + count\n    );\n    const name = documentsTarget.documents![0];\n    return Query.atPath(this.fromQueryPath(name)).toTarget();\n  }\n\n  toQueryTarget(target: Target): api.QueryTarget {\n    // Dissect the path into parent, collectionId, and optional key filter.\n    const result: api.QueryTarget = { structuredQuery: {} };\n    const path = target.path;\n    if (target.collectionGroup !== null) {\n      debugAssert(\n        path.length % 2 === 0,\n        'Collection Group queries should be within a document path or root.'\n      );\n      result.parent = this.toQueryPath(path);\n      result.structuredQuery!.from = [\n        {\n          collectionId: target.collectionGroup,\n          allDescendants: true\n        }\n      ];\n    } else {\n      debugAssert(\n        path.length % 2 !== 0,\n        'Document queries with filters are not supported.'\n      );\n      result.parent = this.toQueryPath(path.popLast());\n      result.structuredQuery!.from = [{ collectionId: path.lastSegment() }];\n    }\n\n    const where = this.toFilter(target.filters);\n    if (where) {\n      result.structuredQuery!.where = where;\n    }\n\n    const orderBy = this.toOrder(target.orderBy);\n    if (orderBy) {\n      result.structuredQuery!.orderBy = orderBy;\n    }\n\n    const limit = this.toInt32Proto(target.limit);\n    if (limit !== null) {\n      result.structuredQuery!.limit = limit;\n    }\n\n    if (target.startAt) {\n      result.structuredQuery!.startAt = this.toCursor(target.startAt);\n    }\n    if (target.endAt) {\n      result.structuredQuery!.endAt = this.toCursor(target.endAt);\n    }\n\n    return result;\n  }\n\n  fromQueryTarget(target: api.QueryTarget): Target {\n    let path = this.fromQueryPath(target.parent!);\n\n    const query = target.structuredQuery!;\n    const fromCount = query.from ? query.from.length : 0;\n    let collectionGroup: string | null = null;\n    if (fromCount > 0) {\n      hardAssert(\n        fromCount === 1,\n        'StructuredQuery.from with more than one collection is not supported.'\n      );\n      const from = query.from![0];\n      if (from.allDescendants) {\n        collectionGroup = from.collectionId!;\n      } else {\n        path = path.child(from.collectionId!);\n      }\n    }\n\n    let filterBy: Filter[] = [];\n    if (query.where) {\n      filterBy = this.fromFilter(query.where);\n    }\n\n    let orderBy: OrderBy[] = [];\n    if (query.orderBy) {\n      orderBy = this.fromOrder(query.orderBy);\n    }\n\n    let limit: number | null = null;\n    if (query.limit) {\n      limit = this.fromInt32Proto(query.limit);\n    }\n\n    let startAt: Bound | null = null;\n    if (query.startAt) {\n      startAt = this.fromCursor(query.startAt);\n    }\n\n    let endAt: Bound | null = null;\n    if (query.endAt) {\n      endAt = this.fromCursor(query.endAt);\n    }\n\n    return new Query(\n      path,\n      collectionGroup,\n      orderBy,\n      filterBy,\n      limit,\n      LimitType.First,\n      startAt,\n      endAt\n    ).toTarget();\n  }\n\n  toListenRequestLabels(\n    targetData: TargetData\n  ): api.ApiClientObjectMap<string> | null {\n    const value = this.toLabel(targetData.purpose);\n    if (value == null) {\n      return null;\n    } else {\n      return {\n        'goog-listen-tags': value\n      };\n    }\n  }\n\n  private toLabel(purpose: TargetPurpose): string | null {\n    switch (purpose) {\n      case TargetPurpose.Listen:\n        return null;\n      case TargetPurpose.ExistenceFilterMismatch:\n        return 'existence-filter-mismatch';\n      case TargetPurpose.LimboResolution:\n        return 'limbo-document';\n      default:\n        return fail('Unrecognized query purpose: ' + purpose);\n    }\n  }\n\n  toTarget(targetData: TargetData): api.Target {\n    let result: api.Target;\n    const target = targetData.target;\n\n    if (target.isDocumentQuery()) {\n      result = { documents: this.toDocumentsTarget(target) };\n    } else {\n      result = { query: this.toQueryTarget(target) };\n    }\n\n    result.targetId = targetData.targetId;\n\n    if (targetData.resumeToken.approximateByteSize() > 0) {\n      result.resumeToken = this.toBytes(targetData.resumeToken);\n    }\n\n    return result;\n  }\n\n  private toFilter(filters: Filter[]): api.Filter | undefined {\n    if (filters.length === 0) {\n      return;\n    }\n    const protos = filters.map(filter => {\n      if (filter instanceof FieldFilter) {\n        return this.toUnaryOrFieldFilter(filter);\n      } else {\n        return fail('Unrecognized filter: ' + JSON.stringify(filter));\n      }\n    });\n    if (protos.length === 1) {\n      return protos[0];\n    }\n    return { compositeFilter: { op: 'AND', filters: protos } };\n  }\n\n  private fromFilter(filter: api.Filter | undefined): Filter[] {\n    if (!filter) {\n      return [];\n    } else if (filter.unaryFilter !== undefined) {\n      return [this.fromUnaryFilter(filter)];\n    } else if (filter.fieldFilter !== undefined) {\n      return [this.fromFieldFilter(filter)];\n    } else if (filter.compositeFilter !== undefined) {\n      return filter.compositeFilter\n        .filters!.map(f => this.fromFilter(f))\n        .reduce((accum, current) => accum.concat(current));\n    } else {\n      return fail('Unknown filter: ' + JSON.stringify(filter));\n    }\n  }\n\n  private toOrder(orderBys: OrderBy[]): api.Order[] | undefined {\n    if (orderBys.length === 0) {\n      return;\n    }\n    return orderBys.map(order => this.toPropertyOrder(order));\n  }\n\n  private fromOrder(orderBys: api.Order[]): OrderBy[] {\n    return orderBys.map(order => this.fromPropertyOrder(order));\n  }\n\n  private toCursor(cursor: Bound): api.Cursor {\n    return {\n      before: cursor.before,\n      values: cursor.position\n    };\n  }\n\n  private fromCursor(cursor: api.Cursor): Bound {\n    const before = !!cursor.before;\n    const position = cursor.values || [];\n    return new Bound(position, before);\n  }\n\n  // visible for testing\n  toDirection(dir: Direction): api.OrderDirection {\n    return DIRECTIONS[dir];\n  }\n\n  // visible for testing\n  fromDirection(dir: api.OrderDirection | undefined): Direction | undefined {\n    switch (dir) {\n      case 'ASCENDING':\n        return Direction.ASCENDING;\n      case 'DESCENDING':\n        return Direction.DESCENDING;\n      default:\n        return undefined;\n    }\n  }\n\n  // visible for testing\n  toOperatorName(op: Operator): api.FieldFilterOp {\n    return OPERATORS[op];\n  }\n\n  fromOperatorName(op: api.FieldFilterOp): Operator {\n    switch (op) {\n      case 'EQUAL':\n        return Operator.EQUAL;\n      case 'GREATER_THAN':\n        return Operator.GREATER_THAN;\n      case 'GREATER_THAN_OR_EQUAL':\n        return Operator.GREATER_THAN_OR_EQUAL;\n      case 'LESS_THAN':\n        return Operator.LESS_THAN;\n      case 'LESS_THAN_OR_EQUAL':\n        return Operator.LESS_THAN_OR_EQUAL;\n      case 'ARRAY_CONTAINS':\n        return Operator.ARRAY_CONTAINS;\n      case 'IN':\n        return Operator.IN;\n      case 'ARRAY_CONTAINS_ANY':\n        return Operator.ARRAY_CONTAINS_ANY;\n      case 'OPERATOR_UNSPECIFIED':\n        return fail('Unspecified operator');\n      default:\n        return fail('Unknown operator');\n    }\n  }\n\n  toFieldPathReference(path: FieldPath): api.FieldReference {\n    return { fieldPath: path.canonicalString() };\n  }\n\n  fromFieldPathReference(fieldReference: api.FieldReference): FieldPath {\n    return FieldPath.fromServerFormat(fieldReference.fieldPath!);\n  }\n\n  // visible for testing\n  toPropertyOrder(orderBy: OrderBy): api.Order {\n    return {\n      field: this.toFieldPathReference(orderBy.field),\n      direction: this.toDirection(orderBy.dir)\n    };\n  }\n\n  fromPropertyOrder(orderBy: api.Order): OrderBy {\n    return new OrderBy(\n      this.fromFieldPathReference(orderBy.field!),\n      this.fromDirection(orderBy.direction)\n    );\n  }\n\n  fromFieldFilter(filter: api.Filter): Filter {\n    return FieldFilter.create(\n      this.fromFieldPathReference(filter.fieldFilter!.field!),\n      this.fromOperatorName(filter.fieldFilter!.op!),\n      filter.fieldFilter!.value!\n    );\n  }\n\n  // visible for testing\n  toUnaryOrFieldFilter(filter: FieldFilter): api.Filter {\n    if (filter.op === Operator.EQUAL) {\n      if (isNanValue(filter.value)) {\n        return {\n          unaryFilter: {\n            field: this.toFieldPathReference(filter.field),\n            op: 'IS_NAN'\n          }\n        };\n      } else if (isNullValue(filter.value)) {\n        return {\n          unaryFilter: {\n            field: this.toFieldPathReference(filter.field),\n            op: 'IS_NULL'\n          }\n        };\n      }\n    }\n    return {\n      fieldFilter: {\n        field: this.toFieldPathReference(filter.field),\n        op: this.toOperatorName(filter.op),\n        value: filter.value\n      }\n    };\n  }\n\n  fromUnaryFilter(filter: api.Filter): Filter {\n    switch (filter.unaryFilter!.op!) {\n      case 'IS_NAN':\n        const nanField = this.fromFieldPathReference(\n          filter.unaryFilter!.field!\n        );\n        return FieldFilter.create(nanField, Operator.EQUAL, {\n          doubleValue: NaN\n        });\n      case 'IS_NULL':\n        const nullField = this.fromFieldPathReference(\n          filter.unaryFilter!.field!\n        );\n        return FieldFilter.create(nullField, Operator.EQUAL, {\n          nullValue: 'NULL_VALUE'\n        });\n      case 'OPERATOR_UNSPECIFIED':\n        return fail('Unspecified filter');\n      default:\n        return fail('Unknown filter');\n    }\n  }\n\n  toDocumentMask(fieldMask: FieldMask): api.DocumentMask {\n    const canonicalFields: string[] = [];\n    fieldMask.fields.forEach(field =>\n      canonicalFields.push(field.canonicalString())\n    );\n    return {\n      fieldPaths: canonicalFields\n    };\n  }\n\n  fromDocumentMask(proto: api.DocumentMask): FieldMask {\n    const paths = proto.fieldPaths || [];\n    return new FieldMask(paths.map(path => FieldPath.fromServerFormat(path)));\n  }\n}\n\nexport function isValidResourceName(path: ResourcePath): boolean {\n  // Resource names have at least 4 components (project ID, database ID)\n  return (\n    path.length >= 4 &&\n    path.get(0) === 'projects' &&\n    path.get(2) === 'databases'\n  );\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { DatabaseId, DatabaseInfo } from '../core/database_info';\nimport { Connection } from '../remote/connection';\nimport { JsonProtoSerializer } from '../remote/serializer';\nimport { fail } from '../util/assert';\nimport { ConnectivityMonitor } from './../remote/connectivity_monitor';\n\n/**\n * Provides a common interface to load anything platform dependent, e.g.\n * the connection implementation.\n *\n * An implementation of this must be provided at compile time for the platform.\n */\n// TODO: Consider only exposing the APIs of 'document' and 'window' that we\n// use in our client.\nexport interface Platform {\n  loadConnection(databaseInfo: DatabaseInfo): Promise<Connection>;\n  newConnectivityMonitor(): ConnectivityMonitor;\n  newSerializer(databaseId: DatabaseId): JsonProtoSerializer;\n\n  /** Formats an object as a JSON string, suitable for logging. */\n  formatJSON(value: unknown): string;\n\n  /** Converts a Base64 encoded string to a binary string. */\n  atob(encoded: string): string;\n\n  /** Converts a binary string to a Base64 encoded string. */\n  btoa(raw: string): string;\n\n  /**\n   * Generates `nBytes` of random bytes.\n   *\n   * If `nBytes < 0` , an error will be thrown.\n   */\n  randomBytes(nBytes: number): Uint8Array;\n\n  /** The Platform's 'window' implementation or null if not available. */\n  readonly window: Window | null;\n\n  /** The Platform's 'document' implementation or null if not available. */\n  readonly document: Document | null;\n\n  /** True if and only if the Base64 conversion functions are available. */\n  readonly base64Available: boolean;\n}\n\n/**\n * Provides singleton helpers where setup code can inject a platform at runtime.\n * setPlatform needs to be set before Firestore is used and must be set exactly\n * once.\n */\nexport class PlatformSupport {\n  private static platform: Platform;\n  static setPlatform(platform: Platform): void {\n    if (PlatformSupport.platform) {\n      fail('Platform already defined');\n    }\n    PlatformSupport.platform = platform;\n  }\n\n  static getPlatform(): Platform {\n    if (!PlatformSupport.platform) {\n      fail('Platform not set');\n    }\n    return PlatformSupport.platform;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Logger, LogLevel } from '@firebase/logger';\nimport { SDK_VERSION } from '../core/version';\nimport { PlatformSupport } from '../platform/platform';\n\nexport { LogLevel };\n\nconst logClient = new Logger('@firebase/firestore');\n\n// Helper methods are needed because variables can't be exported as read/write\nexport function getLogLevel(): LogLevel {\n  return logClient.logLevel;\n}\n\nexport function setLogLevel(newLevel: LogLevel): void {\n  logClient.logLevel = newLevel;\n}\n\nexport function logDebug(msg: string, ...obj: unknown[]): void {\n  if (logClient.logLevel <= LogLevel.DEBUG) {\n    const args = obj.map(argToString);\n    logClient.debug(`Firestore (${SDK_VERSION}): ${msg}`, ...args);\n  }\n}\n\nexport function logError(msg: string, ...obj: unknown[]): void {\n  if (logClient.logLevel <= LogLevel.ERROR) {\n    const args = obj.map(argToString);\n    logClient.error(`Firestore (${SDK_VERSION}): ${msg}`, ...args);\n  }\n}\n\n/**\n * Converts an additional log parameter to a string representation.\n */\nfunction argToString(obj: unknown): string | unknown {\n  if (typeof obj === 'string') {\n    return obj;\n  } else {\n    const platform = PlatformSupport.getPlatform();\n    try {\n      return platform.formatJSON(obj);\n    } catch (e) {\n      // Converting to JSON failed, just log the object directly\n      return obj;\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SDK_VERSION } from '../core/version';\nimport { logError } from './log';\n\n/**\n * Unconditionally fails, throwing an Error with the given message.\n * Messages are stripped in production builds.\n *\n * Returns `never` and can be used in expressions:\n * @example\n * let futureVar = fail('not implemented yet');\n */\nexport function fail(failure: string = 'Unexpected state'): never {\n  // Log the failure in addition to throw an exception, just in case the\n  // exception is swallowed.\n  const message =\n    `FIRESTORE (${SDK_VERSION}) INTERNAL ASSERTION FAILED: ` + failure;\n  logError(message);\n\n  // NOTE: We don't use FirestoreError here because these are internal failures\n  // that cannot be handled by the user. (Also it would create a circular\n  // dependency between the error and assert modules which doesn't work.)\n  throw new Error(message);\n}\n\n/**\n * Fails if the given assertion condition is false, throwing an Error with the\n * given message if it did.\n *\n * Messages are stripped in production builds.\n */\nexport function hardAssert(\n  assertion: boolean,\n  message?: string\n): asserts assertion {\n  if (!assertion) {\n    fail(message);\n  }\n}\n\n/**\n * Fails if the given assertion condition is false, throwing an Error with the\n * given message if it did.\n *\n * The code of callsites invoking this function are stripped out in production\n * builds. Any side-effects of code within the debugAssert() invocation will not\n * happen in this case.\n */\nexport function debugAssert(\n  assertion: boolean,\n  message: string\n): asserts assertion {\n  if (!assertion) {\n    fail(message);\n  }\n}\n\n/**\n * Casts `obj` to `T`. In non-production builds, verifies that `obj` is an\n * instance of `T` before casting.\n */\nexport function debugCast<T>(\n  obj: object,\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  constructor: { new (...args: any[]): T }\n): T {\n  debugAssert(\n    obj instanceof constructor,\n    `Expected type '${constructor.name}', but was '${obj.constructor.name}'`\n  );\n  return obj as T;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert } from './assert';\nimport { PlatformSupport } from '../platform/platform';\n\nexport type EventHandler<E> = (value: E) => void;\nexport interface Indexable {\n  [k: string]: unknown;\n}\n\nexport class AutoId {\n  static newId(): string {\n    // Alphanumeric characters\n    const chars =\n      'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';\n    // The largest byte value that is a multiple of `char.length`.\n    const maxMultiple = Math.floor(256 / chars.length) * chars.length;\n    debugAssert(\n      0 < maxMultiple && maxMultiple < 256,\n      `Expect maxMultiple to be (0, 256), but got ${maxMultiple}`\n    );\n\n    let autoId = '';\n    const targetLength = 20;\n    while (autoId.length < targetLength) {\n      const bytes = PlatformSupport.getPlatform().randomBytes(40);\n      for (let i = 0; i < bytes.length; ++i) {\n        // Only accept values that are [0, maxMultiple), this ensures they can\n        // be evenly mapped to indices of `chars` via a modulo operation.\n        if (autoId.length < targetLength && bytes[i] < maxMultiple) {\n          autoId += chars.charAt(bytes[i] % chars.length);\n        }\n      }\n    }\n    debugAssert(autoId.length === targetLength, 'Invalid auto ID: ' + autoId);\n\n    return autoId;\n  }\n}\n\nexport function primitiveComparator<T>(left: T, right: T): number {\n  if (left < right) {\n    return -1;\n  }\n  if (left > right) {\n    return 1;\n  }\n  return 0;\n}\n\nexport interface Equatable<T> {\n  isEqual(other: T): boolean;\n}\n\n/** Helper to compare arrays using isEqual(). */\nexport function arrayEquals<T>(\n  left: T[],\n  right: T[],\n  comparator: (l: T, r: T) => boolean\n): boolean {\n  if (left.length !== right.length) {\n    return false;\n  }\n  return left.every((value, index) => comparator(value, right[index]));\n}\n/**\n * Returns the immediate lexicographically-following string. This is useful to\n * construct an inclusive range for indexeddb iterators.\n */\nexport function immediateSuccessor(s: string): string {\n  // Return the input string, with an additional NUL byte appended.\n  return s + '\\0';\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { primitiveComparator } from '../util/misc';\n\nexport class DatabaseInfo {\n  /**\n   * Constructs a DatabaseInfo using the provided host, databaseId and\n   * persistenceKey.\n   *\n   * @param databaseId The database to use.\n   * @param persistenceKey A unique identifier for this Firestore's local\n   * storage (used in conjunction with the databaseId).\n   * @param host The Firestore backend host to connect to.\n   * @param ssl Whether to use SSL when connecting.\n   * @param forceLongPolling Whether to use the forceLongPolling option\n   * when using WebChannel as the network transport.\n   */\n  constructor(\n    readonly databaseId: DatabaseId,\n    readonly persistenceKey: string,\n    readonly host: string,\n    readonly ssl: boolean,\n    readonly forceLongPolling: boolean\n  ) {}\n}\n\n/** The default database name for a project. */\nconst DEFAULT_DATABASE_NAME = '(default)';\n\n/** Represents the database ID a Firestore client is associated with. */\nexport class DatabaseId {\n  readonly database: string;\n  constructor(readonly projectId: string, database?: string) {\n    this.database = database ? database : DEFAULT_DATABASE_NAME;\n  }\n\n  get isDefaultDatabase(): boolean {\n    return this.database === DEFAULT_DATABASE_NAME;\n  }\n\n  isEqual(other: {}): boolean {\n    return (\n      other instanceof DatabaseId &&\n      other.projectId === this.projectId &&\n      other.database === this.database\n    );\n  }\n\n  compareTo(other: DatabaseId): number {\n    return (\n      primitiveComparator(this.projectId, other.projectId) ||\n      primitiveComparator(this.database, other.database)\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Equatable } from './misc';\nimport { forEach, isEmpty } from './obj';\n\ntype Entry<K, V> = [K, V];\n\n/**\n * A map implementation that uses objects as keys. Objects must implement the\n * Equatable interface and must be immutable. Entries in the map are stored\n * together with the key being produced from the mapKeyFn. This map\n * automatically handles collisions of keys.\n */\nexport class ObjectMap<KeyType extends Equatable<KeyType>, ValueType> {\n  /**\n   * The inner map for a key -> value pair. Due to the possibility of\n   * collisions we keep a list of entries that we do a linear search through\n   * to find an actual match. Note that collisions should be rare, so we still\n   * expect near constant time lookups in practice.\n   */\n  private inner: {\n    [canonicalId: string]: Array<Entry<KeyType, ValueType>>;\n  } = {};\n\n  constructor(private mapKeyFn: (key: KeyType) => string) {}\n\n  /** Get a value for this key, or undefined if it does not exist. */\n  get(key: KeyType): ValueType | undefined {\n    const id = this.mapKeyFn(key);\n    const matches = this.inner[id];\n    if (matches === undefined) {\n      return undefined;\n    }\n    for (const [otherKey, value] of matches) {\n      if (otherKey.isEqual(key)) {\n        return value;\n      }\n    }\n    return undefined;\n  }\n\n  has(key: KeyType): boolean {\n    return this.get(key) !== undefined;\n  }\n\n  /** Put this key and value in the map. */\n  set(key: KeyType, value: ValueType): void {\n    const id = this.mapKeyFn(key);\n    const matches = this.inner[id];\n    if (matches === undefined) {\n      this.inner[id] = [[key, value]];\n      return;\n    }\n    for (let i = 0; i < matches.length; i++) {\n      if (matches[i][0].isEqual(key)) {\n        matches[i] = [key, value];\n        return;\n      }\n    }\n    matches.push([key, value]);\n  }\n\n  /**\n   * Remove this key from the map. Returns a boolean if anything was deleted.\n   */\n  delete(key: KeyType): boolean {\n    const id = this.mapKeyFn(key);\n    const matches = this.inner[id];\n    if (matches === undefined) {\n      return false;\n    }\n    for (let i = 0; i < matches.length; i++) {\n      if (matches[i][0].isEqual(key)) {\n        if (matches.length === 1) {\n          delete this.inner[id];\n        } else {\n          matches.splice(i, 1);\n        }\n        return true;\n      }\n    }\n    return false;\n  }\n\n  forEach(fn: (key: KeyType, val: ValueType) => void): void {\n    forEach(this.inner, (_, entries) => {\n      for (const [k, v] of entries) {\n        fn(k, v);\n      }\n    });\n  }\n\n  isEmpty(): boolean {\n    return isEmpty(this.inner);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Timestamp } from '../api/timestamp';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { BatchId } from '../core/types';\nimport { hardAssert, debugAssert } from '../util/assert';\nimport { arrayEquals } from '../util/misc';\nimport { ByteString } from '../util/byte_string';\nimport {\n  documentKeySet,\n  DocumentKeySet,\n  DocumentVersionMap,\n  documentVersionMap,\n  MaybeDocumentMap\n} from './collections';\nimport { MaybeDocument } from './document';\nimport { DocumentKey } from './document_key';\nimport { Mutation, MutationResult } from './mutation';\n\nexport const BATCHID_UNKNOWN = -1;\n\n/**\n * A batch of mutations that will be sent as one unit to the backend.\n */\nexport class MutationBatch {\n  /**\n   * @param batchId The unique ID of this mutation batch.\n   * @param localWriteTime The original write time of this mutation.\n   * @param baseMutations Mutations that are used to populate the base\n   * values when this mutation is applied locally. This can be used to locally\n   * overwrite values that are persisted in the remote document cache. Base\n   * mutations are never sent to the backend.\n   * @param mutations The user-provided mutations in this mutation batch.\n   * User-provided mutations are applied both locally and remotely on the\n   * backend.\n   */\n  constructor(\n    public batchId: BatchId,\n    public localWriteTime: Timestamp,\n    public baseMutations: Mutation[],\n    public mutations: Mutation[]\n  ) {\n    debugAssert(mutations.length > 0, 'Cannot create an empty mutation batch');\n  }\n\n  /**\n   * Applies all the mutations in this MutationBatch to the specified document\n   * to create a new remote document\n   *\n   * @param docKey The key of the document to apply mutations to.\n   * @param maybeDoc The document to apply mutations to.\n   * @param batchResult The result of applying the MutationBatch to the\n   * backend.\n   */\n  applyToRemoteDocument(\n    docKey: DocumentKey,\n    maybeDoc: MaybeDocument | null,\n    batchResult: MutationBatchResult\n  ): MaybeDocument | null {\n    if (maybeDoc) {\n      debugAssert(\n        maybeDoc.key.isEqual(docKey),\n        `applyToRemoteDocument: key ${docKey} should match maybeDoc key\n        ${maybeDoc.key}`\n      );\n    }\n\n    const mutationResults = batchResult.mutationResults;\n    debugAssert(\n      mutationResults.length === this.mutations.length,\n      `Mismatch between mutations length\n      (${this.mutations.length}) and mutation results length\n      (${mutationResults.length}).`\n    );\n\n    for (let i = 0; i < this.mutations.length; i++) {\n      const mutation = this.mutations[i];\n      if (mutation.key.isEqual(docKey)) {\n        const mutationResult = mutationResults[i];\n        maybeDoc = mutation.applyToRemoteDocument(maybeDoc, mutationResult);\n      }\n    }\n    return maybeDoc;\n  }\n\n  /**\n   * Computes the local view of a document given all the mutations in this\n   * batch.\n   *\n   * @param docKey The key of the document to apply mutations to.\n   * @param maybeDoc The document to apply mutations to.\n   */\n  applyToLocalView(\n    docKey: DocumentKey,\n    maybeDoc: MaybeDocument | null\n  ): MaybeDocument | null {\n    if (maybeDoc) {\n      debugAssert(\n        maybeDoc.key.isEqual(docKey),\n        `applyToLocalDocument: key ${docKey} should match maybeDoc key\n        ${maybeDoc.key}`\n      );\n    }\n\n    // First, apply the base state. This allows us to apply non-idempotent\n    // transform against a consistent set of values.\n    for (const mutation of this.baseMutations) {\n      if (mutation.key.isEqual(docKey)) {\n        maybeDoc = mutation.applyToLocalView(\n          maybeDoc,\n          maybeDoc,\n          this.localWriteTime\n        );\n      }\n    }\n\n    const baseDoc = maybeDoc;\n\n    // Second, apply all user-provided mutations.\n    for (const mutation of this.mutations) {\n      if (mutation.key.isEqual(docKey)) {\n        maybeDoc = mutation.applyToLocalView(\n          maybeDoc,\n          baseDoc,\n          this.localWriteTime\n        );\n      }\n    }\n    return maybeDoc;\n  }\n\n  /**\n   * Computes the local view for all provided documents given the mutations in\n   * this batch.\n   */\n  applyToLocalDocumentSet(maybeDocs: MaybeDocumentMap): MaybeDocumentMap {\n    // TODO(mrschmidt): This implementation is O(n^2). If we apply the mutations\n    // directly (as done in `applyToLocalView()`), we can reduce the complexity\n    // to O(n).\n    let mutatedDocuments = maybeDocs;\n    this.mutations.forEach(m => {\n      const mutatedDocument = this.applyToLocalView(\n        m.key,\n        maybeDocs.get(m.key)\n      );\n      if (mutatedDocument) {\n        mutatedDocuments = mutatedDocuments.insert(m.key, mutatedDocument);\n      }\n    });\n    return mutatedDocuments;\n  }\n\n  keys(): DocumentKeySet {\n    return this.mutations.reduce(\n      (keys, m) => keys.add(m.key),\n      documentKeySet()\n    );\n  }\n\n  isEqual(other: MutationBatch): boolean {\n    return (\n      this.batchId === other.batchId &&\n      arrayEquals(this.mutations, other.mutations, (l, r) => l.isEqual(r)) &&\n      arrayEquals(this.baseMutations, other.baseMutations, (l, r) =>\n        l.isEqual(r)\n      )\n    );\n  }\n}\n\n/** The result of applying a mutation batch to the backend. */\nexport class MutationBatchResult {\n  private constructor(\n    readonly batch: MutationBatch,\n    readonly commitVersion: SnapshotVersion,\n    readonly mutationResults: MutationResult[],\n    readonly streamToken: ByteString,\n    /**\n     * A pre-computed mapping from each mutated document to the resulting\n     * version.\n     */\n    readonly docVersions: DocumentVersionMap\n  ) {}\n\n  /**\n   * Creates a new MutationBatchResult for the given batch and results. There\n   * must be one result for each mutation in the batch. This static factory\n   * caches a document=>version mapping (docVersions).\n   */\n  static from(\n    batch: MutationBatch,\n    commitVersion: SnapshotVersion,\n    results: MutationResult[],\n    streamToken: ByteString\n  ): MutationBatchResult {\n    hardAssert(\n      batch.mutations.length === results.length,\n      'Mutations sent ' +\n        batch.mutations.length +\n        ' must equal results received ' +\n        results.length\n    );\n\n    let versionMap = documentVersionMap();\n    const mutations = batch.mutations;\n    for (let i = 0; i < mutations.length; i++) {\n      versionMap = versionMap.insert(mutations[i].key, results[i].version);\n    }\n\n    return new MutationBatchResult(\n      batch,\n      commitVersion,\n      results,\n      streamToken,\n      versionMap\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { fail } from '../util/assert';\n\nexport type FulfilledHandler<T, R> =\n  | ((result: T) => R | PersistencePromise<R>)\n  | null;\nexport type RejectedHandler<R> =\n  | ((reason: Error) => R | PersistencePromise<R>)\n  | null;\nexport type Resolver<T> = (value?: T) => void;\nexport type Rejector = (error: Error) => void;\n\n/**\n * PersistencePromise<> is essentially a re-implementation of Promise<> except\n * it has a .next() method instead of .then() and .next() and .catch() callbacks\n * are executed synchronously when a PersistencePromise resolves rather than\n * asynchronously (Promise<> implementations use setImmediate() or similar).\n *\n * This is necessary to interoperate with IndexedDB which will automatically\n * commit transactions if control is returned to the event loop without\n * synchronously initiating another operation on the transaction.\n *\n * NOTE: .then() and .catch() only allow a single consumer, unlike normal\n * Promises.\n */\nexport class PersistencePromise<T> {\n  // NOTE: next/catchCallback will always point to our own wrapper functions,\n  // not the user's raw next() or catch() callbacks.\n  private nextCallback: FulfilledHandler<T, unknown> = null;\n  private catchCallback: RejectedHandler<unknown> = null;\n\n  // When the operation resolves, we'll set result or error and mark isDone.\n  private result: T | undefined = undefined;\n  private error: Error | undefined = undefined;\n  private isDone = false;\n\n  // Set to true when .then() or .catch() are called and prevents additional\n  // chaining.\n  private callbackAttached = false;\n\n  constructor(callback: (resolve: Resolver<T>, reject: Rejector) => void) {\n    callback(\n      value => {\n        this.isDone = true;\n        this.result = value;\n        if (this.nextCallback) {\n          // value should be defined unless T is Void, but we can't express\n          // that in the type system.\n          this.nextCallback(value!);\n        }\n      },\n      error => {\n        this.isDone = true;\n        this.error = error;\n        if (this.catchCallback) {\n          this.catchCallback(error);\n        }\n      }\n    );\n  }\n\n  catch<R>(\n    fn: (error: Error) => R | PersistencePromise<R>\n  ): PersistencePromise<R> {\n    return this.next(undefined, fn);\n  }\n\n  next<R>(\n    nextFn?: FulfilledHandler<T, R>,\n    catchFn?: RejectedHandler<R>\n  ): PersistencePromise<R> {\n    if (this.callbackAttached) {\n      fail('Called next() or catch() twice for PersistencePromise');\n    }\n    this.callbackAttached = true;\n    if (this.isDone) {\n      if (!this.error) {\n        return this.wrapSuccess(nextFn, this.result!);\n      } else {\n        return this.wrapFailure(catchFn, this.error);\n      }\n    } else {\n      return new PersistencePromise<R>((resolve, reject) => {\n        this.nextCallback = (value: T) => {\n          this.wrapSuccess(nextFn, value).next(resolve, reject);\n        };\n        this.catchCallback = (error: Error) => {\n          this.wrapFailure(catchFn, error).next(resolve, reject);\n        };\n      });\n    }\n  }\n\n  toPromise(): Promise<T> {\n    return new Promise((resolve, reject) => {\n      this.next(resolve, reject);\n    });\n  }\n\n  private wrapUserFunction<R>(\n    fn: () => R | PersistencePromise<R>\n  ): PersistencePromise<R> {\n    try {\n      const result = fn();\n      if (result instanceof PersistencePromise) {\n        return result;\n      } else {\n        return PersistencePromise.resolve(result);\n      }\n    } catch (e) {\n      return PersistencePromise.reject<R>(e);\n    }\n  }\n\n  private wrapSuccess<R>(\n    nextFn: FulfilledHandler<T, R> | undefined,\n    value: T\n  ): PersistencePromise<R> {\n    if (nextFn) {\n      return this.wrapUserFunction(() => nextFn(value));\n    } else {\n      // If there's no nextFn, then R must be the same as T\n      return PersistencePromise.resolve<R>((value as unknown) as R);\n    }\n  }\n\n  private wrapFailure<R>(\n    catchFn: RejectedHandler<R> | undefined,\n    error: Error\n  ): PersistencePromise<R> {\n    if (catchFn) {\n      return this.wrapUserFunction(() => catchFn(error));\n    } else {\n      return PersistencePromise.reject<R>(error);\n    }\n  }\n\n  static resolve(): PersistencePromise<void>;\n  static resolve<R>(result: R): PersistencePromise<R>;\n  static resolve<R>(result?: R): PersistencePromise<R | void> {\n    return new PersistencePromise<R | void>((resolve, reject) => {\n      resolve(result);\n    });\n  }\n\n  static reject<R>(error: Error): PersistencePromise<R> {\n    return new PersistencePromise<R>((resolve, reject) => {\n      reject(error);\n    });\n  }\n\n  static waitFor(\n    // Accept all Promise types in waitFor().\n    // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    all: { forEach: (cb: (el: PersistencePromise<any>) => void) => void }\n  ): PersistencePromise<void> {\n    return new PersistencePromise<void>((resolve, reject) => {\n      let expectedCount = 0;\n      let resolvedCount = 0;\n      let done = false;\n\n      all.forEach(element => {\n        ++expectedCount;\n        element.next(\n          () => {\n            ++resolvedCount;\n            if (done && resolvedCount === expectedCount) {\n              resolve();\n            }\n          },\n          err => reject(err)\n        );\n      });\n\n      done = true;\n      if (resolvedCount === expectedCount) {\n        resolve();\n      }\n    });\n  }\n\n  /**\n   * Given an array of predicate functions that asynchronously evaluate to a\n   * boolean, implements a short-circuiting `or` between the results. Predicates\n   * will be evaluated until one of them returns `true`, then stop. The final\n   * result will be whether any of them returned `true`.\n   */\n  static or(\n    predicates: Array<() => PersistencePromise<boolean>>\n  ): PersistencePromise<boolean> {\n    let p: PersistencePromise<boolean> = PersistencePromise.resolve<boolean>(\n      false\n    );\n    for (const predicate of predicates) {\n      p = p.next(isTrue => {\n        if (isTrue) {\n          return PersistencePromise.resolve<boolean>(isTrue);\n        } else {\n          return predicate();\n        }\n      });\n    }\n    return p;\n  }\n\n  /**\n   * Given an iterable, call the given function on each element in the\n   * collection and wait for all of the resulting concurrent PersistencePromises\n   * to resolve.\n   */\n  static forEach<R, S>(\n    collection: { forEach: (cb: (r: R, s: S) => void) => void },\n    f:\n      | ((r: R, s: S) => PersistencePromise<void>)\n      | ((r: R) => PersistencePromise<void>)\n  ): PersistencePromise<void>;\n  static forEach<R>(\n    collection: { forEach: (cb: (r: R) => void) => void },\n    f: (r: R) => PersistencePromise<void>\n  ): PersistencePromise<void>;\n  static forEach<R, S>(\n    collection: { forEach: (cb: (r: R, s?: S) => void) => void },\n    f: (r: R, s?: S) => PersistencePromise<void>\n  ): PersistencePromise<void> {\n    const promises: Array<PersistencePromise<void>> = [];\n    collection.forEach((r, s) => {\n      promises.push(f.call(this, r, s));\n    });\n    return this.waitFor(promises);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { DocumentKeySet, NullableMaybeDocumentMap } from '../model/collections';\nimport { MaybeDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { debugAssert } from '../util/assert';\nimport { ObjectMap } from '../util/obj_map';\n\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { SnapshotVersion } from '../core/snapshot_version';\n\n/**\n * An in-memory buffer of entries to be written to a RemoteDocumentCache.\n * It can be used to batch up a set of changes to be written to the cache, but\n * additionally supports reading entries back with the `getEntry()` method,\n * falling back to the underlying RemoteDocumentCache if no entry is\n * buffered.\n *\n * Entries added to the cache *must* be read first. This is to facilitate\n * calculating the size delta of the pending changes.\n *\n * PORTING NOTE: This class was implemented then removed from other platforms.\n * If byte-counting ends up being needed on the other platforms, consider\n * porting this class as part of that implementation work.\n */\nexport abstract class RemoteDocumentChangeBuffer {\n  // A mapping of document key to the new cache entry that should be written (or null if any\n  // existing cache entry should be removed).\n  protected changes: ObjectMap<\n    DocumentKey,\n    MaybeDocument | null\n  > = new ObjectMap(key => key.toString());\n\n  // The read time to use for all added documents in this change buffer.\n  private _readTime: SnapshotVersion | undefined;\n\n  private changesApplied = false;\n\n  protected abstract getFromCache(\n    transaction: PersistenceTransaction,\n    documentKey: DocumentKey\n  ): PersistencePromise<MaybeDocument | null>;\n\n  protected abstract getAllFromCache(\n    transaction: PersistenceTransaction,\n    documentKeys: DocumentKeySet\n  ): PersistencePromise<NullableMaybeDocumentMap>;\n\n  protected abstract applyChanges(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<void>;\n\n  protected set readTime(value: SnapshotVersion) {\n    // Right now (for simplicity) we just track a single readTime for all the\n    // added entries since we expect them to all be the same, but we could\n    // rework to store per-entry readTimes if necessary.\n    debugAssert(\n      this._readTime === undefined || this._readTime.isEqual(value),\n      'All changes in a RemoteDocumentChangeBuffer must have the same read time'\n    );\n    this._readTime = value;\n  }\n\n  protected get readTime(): SnapshotVersion {\n    debugAssert(\n      this._readTime !== undefined,\n      'Read time is not set. All removeEntry() calls must include a readTime if `trackRemovals` is used.'\n    );\n    return this._readTime;\n  }\n\n  /**\n   * Buffers a `RemoteDocumentCache.addEntry()` call.\n   *\n   * You can only modify documents that have already been retrieved via\n   * `getEntry()/getEntries()` (enforced via IndexedDbs `apply()`).\n   */\n  addEntry(maybeDocument: MaybeDocument, readTime: SnapshotVersion): void {\n    this.assertNotApplied();\n    this.readTime = readTime;\n    this.changes.set(maybeDocument.key, maybeDocument);\n  }\n\n  /**\n   * Buffers a `RemoteDocumentCache.removeEntry()` call.\n   *\n   * You can only remove documents that have already been retrieved via\n   * `getEntry()/getEntries()` (enforced via IndexedDbs `apply()`).\n   */\n  removeEntry(key: DocumentKey, readTime?: SnapshotVersion): void {\n    this.assertNotApplied();\n    if (readTime) {\n      this.readTime = readTime;\n    }\n    this.changes.set(key, null);\n  }\n\n  /**\n   * Looks up an entry in the cache. The buffered changes will first be checked,\n   * and if no buffered change applies, this will forward to\n   * `RemoteDocumentCache.getEntry()`.\n   *\n   * @param transaction The transaction in which to perform any persistence\n   *     operations.\n   * @param documentKey The key of the entry to look up.\n   * @return The cached Document or NoDocument entry, or null if we have nothing\n   * cached.\n   */\n  getEntry(\n    transaction: PersistenceTransaction,\n    documentKey: DocumentKey\n  ): PersistencePromise<MaybeDocument | null> {\n    this.assertNotApplied();\n    const bufferedEntry = this.changes.get(documentKey);\n    if (bufferedEntry !== undefined) {\n      return PersistencePromise.resolve<MaybeDocument | null>(bufferedEntry);\n    } else {\n      return this.getFromCache(transaction, documentKey);\n    }\n  }\n\n  /**\n   * Looks up several entries in the cache, forwarding to\n   * `RemoteDocumentCache.getEntry()`.\n   *\n   * @param transaction The transaction in which to perform any persistence\n   *     operations.\n   * @param documentKeys The keys of the entries to look up.\n   * @return A map of cached `Document`s or `NoDocument`s, indexed by key. If an\n   *     entry cannot be found, the corresponding key will be mapped to a null\n   *     value.\n   */\n  getEntries(\n    transaction: PersistenceTransaction,\n    documentKeys: DocumentKeySet\n  ): PersistencePromise<NullableMaybeDocumentMap> {\n    return this.getAllFromCache(transaction, documentKeys);\n  }\n\n  /**\n   * Applies buffered changes to the underlying RemoteDocumentCache, using\n   * the provided transaction.\n   */\n  apply(transaction: PersistenceTransaction): PersistencePromise<void> {\n    this.assertNotApplied();\n    this.changesApplied = true;\n    return this.applyChanges(transaction);\n  }\n\n  /** Helper to assert this.changes is not null  */\n  protected assertNotApplied(): void {\n    debugAssert(!this.changesApplied, 'Changes have already been applied.');\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { User } from '../auth/user';\nimport { ListenSequenceNumber, TargetId } from '../core/types';\nimport { DocumentKey } from '../model/document_key';\nimport { IndexManager } from './index_manager';\nimport { LocalStore } from './local_store';\nimport { MutationQueue } from './mutation_queue';\nimport { PersistencePromise } from './persistence_promise';\nimport { TargetCache } from './target_cache';\nimport { RemoteDocumentCache } from './remote_document_cache';\nimport { TargetData } from './target_data';\n\nexport const PRIMARY_LEASE_LOST_ERROR_MSG =\n  'The current tab is not in the required state to perform this operation. ' +\n  'It might be necessary to refresh the browser tab.';\n\n/**\n * A base class representing a persistence transaction, encapsulating both the\n * transaction's sequence numbers as well as a list of onCommitted listeners.\n *\n * When you call Persistence.runTransaction(), it will create a transaction and\n * pass it to your callback. You then pass it to any method that operates\n * on persistence.\n */\nexport abstract class PersistenceTransaction {\n  private readonly onCommittedListeners: Array<() => void> = [];\n\n  abstract readonly currentSequenceNumber: ListenSequenceNumber;\n\n  addOnCommittedListener(listener: () => void): void {\n    this.onCommittedListeners.push(listener);\n  }\n\n  raiseOnCommittedEvent(): void {\n    this.onCommittedListeners.forEach(listener => listener());\n  }\n}\n\n/** The different modes supported by `IndexedDbPersistence.runTransaction()`. */\nexport type PersistenceTransactionMode =\n  | 'readonly'\n  | 'readwrite'\n  | 'readwrite-primary';\n\n/**\n * Callback type for primary state notifications. This callback can be\n * registered with the persistence layer to get notified when we transition from\n * primary to secondary state and vice versa.\n *\n * Note: Instances can only toggle between Primary and Secondary state if\n * IndexedDB persistence is enabled and multiple clients are active. If this\n * listener is registered with MemoryPersistence, the callback will be called\n * exactly once marking the current instance as Primary.\n */\nexport type PrimaryStateListener = (isPrimary: boolean) => Promise<void>;\n\n/**\n * A ReferenceDelegate instance handles all of the hooks into the document-reference lifecycle. This\n * includes being added to a target, being removed from a target, being subject to mutation, and\n * being mutated by the user.\n *\n * Different implementations may do different things with each of these events. Not every\n * implementation needs to do something with every lifecycle hook.\n *\n * PORTING NOTE: since sequence numbers are attached to transactions in this\n * client, the ReferenceDelegate does not need to deal in transactional\n * semantics (onTransactionStarted/Committed()), nor does it need to track and\n * generate sequence numbers (getCurrentSequenceNumber()).\n */\nexport interface ReferenceDelegate {\n  /** Notify the delegate that the given document was added to a target. */\n  addReference(\n    txn: PersistenceTransaction,\n    targetId: TargetId,\n    doc: DocumentKey\n  ): PersistencePromise<void>;\n\n  /** Notify the delegate that the given document was removed from a target. */\n  removeReference(\n    txn: PersistenceTransaction,\n    targetId: TargetId,\n    doc: DocumentKey\n  ): PersistencePromise<void>;\n\n  /**\n   * Notify the delegate that a target was removed. The delegate may, but is not obligated to,\n   * actually delete the target and associated data.\n   */\n  removeTarget(\n    txn: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void>;\n\n  /**\n   * Notify the delegate that a document may no longer be part of any views or\n   * have any mutations associated.\n   */\n  markPotentiallyOrphaned(\n    txn: PersistenceTransaction,\n    doc: DocumentKey\n  ): PersistencePromise<void>;\n\n  /** Notify the delegate that a limbo document was updated. */\n  updateLimboDocument(\n    txn: PersistenceTransaction,\n    doc: DocumentKey\n  ): PersistencePromise<void>;\n}\n\n/**\n * Persistence is the lowest-level shared interface to persistent storage in\n * Firestore.\n *\n * Persistence is used to create MutationQueue and RemoteDocumentCache\n * instances backed by persistence (which might be in-memory or LevelDB).\n *\n * Persistence also exposes an API to create and run PersistenceTransactions\n * against persistence. All read / write operations must be wrapped in a\n * transaction. Implementations of PersistenceTransaction / Persistence only\n * need to guarantee that writes made against the transaction are not made to\n * durable storage until the transaction resolves its PersistencePromise.\n * Since memory-only storage components do not alter durable storage, they are\n * free to ignore the transaction.\n *\n * This contract is enough to allow the LocalStore be be written\n * independently of whether or not the stored state actually is durably\n * persisted. If persistent storage is enabled, writes are grouped together to\n * avoid inconsistent state that could cause crashes.\n *\n * Concretely, when persistent storage is enabled, the persistent versions of\n * MutationQueue, RemoteDocumentCache, and others (the mutators) will\n * defer their writes into a transaction. Once the local store has completed\n * one logical operation, it commits the transaction.\n *\n * When persistent storage is disabled, the non-persistent versions of the\n * mutators ignore the transaction. This short-cut is allowed because\n * memory-only storage leaves no state so it cannot be inconsistent.\n *\n * This simplifies the implementations of the mutators and allows memory-only\n * implementations to supplement the persistent ones without requiring any\n * special dual-store implementation of Persistence. The cost is that the\n * LocalStore needs to be slightly careful about the order of its reads and\n * writes in order to avoid relying on being able to read back uncommitted\n * writes.\n */\nexport interface Persistence {\n  /**\n   * Whether or not this persistence instance has been started.\n   */\n  readonly started: boolean;\n\n  readonly referenceDelegate: ReferenceDelegate;\n\n  /** Starts persistence. */\n  start(): Promise<void>;\n\n  /**\n   * Releases any resources held during eager shutdown.\n   */\n  shutdown(): Promise<void>;\n\n  /**\n   * Registers a listener that gets called when the database receives a\n   * version change event indicating that it has deleted.\n   *\n   * PORTING NOTE: This is only used for Web multi-tab.\n   */\n  setDatabaseDeletedListener(\n    databaseDeletedListener: () => Promise<void>\n  ): void;\n\n  /**\n   * Returns a MutationQueue representing the persisted mutations for the\n   * given user.\n   *\n   * Note: The implementation is free to return the same instance every time\n   * this is called for a given user. In particular, the memory-backed\n   * implementation does this to emulate the persisted implementation to the\n   * extent possible (e.g. in the case of uid switching from\n   * sally=>jack=>sally, sally's mutation queue will be preserved).\n   */\n  getMutationQueue(user: User): MutationQueue;\n\n  /**\n   * Returns a TargetCache representing the persisted cache of targets.\n   *\n   * Note: The implementation is free to return the same instance every time\n   * this is called. In particular, the memory-backed implementation does this\n   * to emulate the persisted implementation to the extent possible.\n   */\n  getTargetCache(): TargetCache;\n\n  /**\n   * Returns a RemoteDocumentCache representing the persisted cache of remote\n   * documents.\n   *\n   * Note: The implementation is free to return the same instance every time\n   * this is called. In particular, the memory-backed implementation does this\n   * to emulate the persisted implementation to the extent possible.\n   */\n  getRemoteDocumentCache(): RemoteDocumentCache;\n\n  /**\n   * Returns an IndexManager instance that manages our persisted query indexes.\n   *\n   * Note: The implementation is free to return the same instance every time\n   * this is called. In particular, the memory-backed implementation does this\n   * to emulate the persisted implementation to the extent possible.\n   */\n  getIndexManager(): IndexManager;\n\n  /**\n   * Performs an operation inside a persistence transaction. Any reads or writes\n   * against persistence must be performed within a transaction. Writes will be\n   * committed atomically once the transaction completes.\n   *\n   * Persistence operations are asynchronous and therefore the provided\n   * transactionOperation must return a PersistencePromise. When it is resolved,\n   * the transaction will be committed and the Promise returned by this method\n   * will resolve.\n   *\n   * @param action A description of the action performed by this transaction,\n   * used for logging.\n   * @param mode The underlying mode of the IndexedDb transaction. Can be\n   * 'readonly`, 'readwrite' or 'readwrite-primary'. Transactions marked\n   * 'readwrite-primary' can only be executed by the primary client. In this\n   * mode, the transactionOperation will not be run if the primary lease cannot\n   * be acquired and the returned promise will be rejected with a\n   * FAILED_PRECONDITION error.\n   * @param transactionOperation The operation to run inside a transaction.\n   * @return A promise that is resolved once the transaction completes.\n   */\n  runTransaction<T>(\n    action: string,\n    mode: PersistenceTransactionMode,\n    transactionOperation: (\n      transaction: PersistenceTransaction\n    ) => PersistencePromise<T>\n  ): Promise<T>;\n}\n\n/**\n * Interface implemented by the LRU scheduler to start(), stop() and restart\n * garbage collection.\n */\nexport interface GarbageCollectionScheduler {\n  readonly started: boolean;\n  start(localStore: LocalStore): void;\n  stop(): void;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Query } from '../core/query';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport {\n  DocumentKeySet,\n  documentKeySet,\n  DocumentMap,\n  documentMap,\n  MaybeDocumentMap,\n  maybeDocumentMap,\n  NullableMaybeDocumentMap,\n  nullableMaybeDocumentMap\n} from '../model/collections';\nimport { Document, MaybeDocument, NoDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { MutationBatch } from '../model/mutation_batch';\nimport { ResourcePath } from '../model/path';\n\nimport { debugAssert } from '../util/assert';\nimport { IndexManager } from './index_manager';\nimport { MutationQueue } from './mutation_queue';\nimport { PatchMutation } from '../model/mutation';\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { RemoteDocumentCache } from './remote_document_cache';\n\n/**\n * A readonly view of the local state of all documents we're tracking (i.e. we\n * have a cached version in remoteDocumentCache or local mutations for the\n * document). The view is computed by applying the mutations in the\n * MutationQueue to the RemoteDocumentCache.\n */\nexport class LocalDocumentsView {\n  constructor(\n    readonly remoteDocumentCache: RemoteDocumentCache,\n    readonly mutationQueue: MutationQueue,\n    readonly indexManager: IndexManager\n  ) {}\n\n  /**\n   * Get the local view of the document identified by `key`.\n   *\n   * @return Local view of the document or null if we don't have any cached\n   * state for it.\n   */\n  getDocument(\n    transaction: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<MaybeDocument | null> {\n    return this.mutationQueue\n      .getAllMutationBatchesAffectingDocumentKey(transaction, key)\n      .next(batches => this.getDocumentInternal(transaction, key, batches));\n  }\n\n  /** Internal version of `getDocument` that allows reusing batches. */\n  private getDocumentInternal(\n    transaction: PersistenceTransaction,\n    key: DocumentKey,\n    inBatches: MutationBatch[]\n  ): PersistencePromise<MaybeDocument | null> {\n    return this.remoteDocumentCache.getEntry(transaction, key).next(doc => {\n      for (const batch of inBatches) {\n        doc = batch.applyToLocalView(key, doc);\n      }\n      return doc;\n    });\n  }\n\n  // Returns the view of the given `docs` as they would appear after applying\n  // all mutations in the given `batches`.\n  private applyLocalMutationsToDocuments(\n    transaction: PersistenceTransaction,\n    docs: NullableMaybeDocumentMap,\n    batches: MutationBatch[]\n  ): NullableMaybeDocumentMap {\n    let results = nullableMaybeDocumentMap();\n    docs.forEach((key, localView) => {\n      for (const batch of batches) {\n        localView = batch.applyToLocalView(key, localView);\n      }\n      results = results.insert(key, localView);\n    });\n    return results;\n  }\n\n  /**\n   * Gets the local view of the documents identified by `keys`.\n   *\n   * If we don't have cached state for a document in `keys`, a NoDocument will\n   * be stored for that key in the resulting set.\n   */\n  getDocuments(\n    transaction: PersistenceTransaction,\n    keys: DocumentKeySet\n  ): PersistencePromise<MaybeDocumentMap> {\n    return this.remoteDocumentCache\n      .getEntries(transaction, keys)\n      .next(docs => this.getLocalViewOfDocuments(transaction, docs));\n  }\n\n  /**\n   * Similar to `getDocuments`, but creates the local view from the given\n   * `baseDocs` without retrieving documents from the local store.\n   */\n  getLocalViewOfDocuments(\n    transaction: PersistenceTransaction,\n    baseDocs: NullableMaybeDocumentMap\n  ): PersistencePromise<MaybeDocumentMap> {\n    return this.mutationQueue\n      .getAllMutationBatchesAffectingDocumentKeys(transaction, baseDocs)\n      .next(batches => {\n        const docs = this.applyLocalMutationsToDocuments(\n          transaction,\n          baseDocs,\n          batches\n        );\n        let results = maybeDocumentMap();\n        docs.forEach((key, maybeDoc) => {\n          // TODO(http://b/32275378): Don't conflate missing / deleted.\n          if (!maybeDoc) {\n            maybeDoc = new NoDocument(key, SnapshotVersion.min());\n          }\n          results = results.insert(key, maybeDoc);\n        });\n\n        return results;\n      });\n  }\n\n  /**\n   * Performs a query against the local view of all documents.\n   *\n   * @param transaction The persistence transaction.\n   * @param query The query to match documents against.\n   * @param sinceReadTime If not set to SnapshotVersion.min(), return only\n   *     documents that have been read since this snapshot version (exclusive).\n   */\n  getDocumentsMatchingQuery(\n    transaction: PersistenceTransaction,\n    query: Query,\n    sinceReadTime: SnapshotVersion\n  ): PersistencePromise<DocumentMap> {\n    if (query.isDocumentQuery()) {\n      return this.getDocumentsMatchingDocumentQuery(transaction, query.path);\n    } else if (query.isCollectionGroupQuery()) {\n      return this.getDocumentsMatchingCollectionGroupQuery(\n        transaction,\n        query,\n        sinceReadTime\n      );\n    } else {\n      return this.getDocumentsMatchingCollectionQuery(\n        transaction,\n        query,\n        sinceReadTime\n      );\n    }\n  }\n\n  private getDocumentsMatchingDocumentQuery(\n    transaction: PersistenceTransaction,\n    docPath: ResourcePath\n  ): PersistencePromise<DocumentMap> {\n    // Just do a simple document lookup.\n    return this.getDocument(transaction, new DocumentKey(docPath)).next(\n      maybeDoc => {\n        let result = documentMap();\n        if (maybeDoc instanceof Document) {\n          result = result.insert(maybeDoc.key, maybeDoc);\n        }\n        return result;\n      }\n    );\n  }\n\n  private getDocumentsMatchingCollectionGroupQuery(\n    transaction: PersistenceTransaction,\n    query: Query,\n    sinceReadTime: SnapshotVersion\n  ): PersistencePromise<DocumentMap> {\n    debugAssert(\n      query.path.isEmpty(),\n      'Currently we only support collection group queries at the root.'\n    );\n    const collectionId = query.collectionGroup!;\n    let results = documentMap();\n    return this.indexManager\n      .getCollectionParents(transaction, collectionId)\n      .next(parents => {\n        // Perform a collection query against each parent that contains the\n        // collectionId and aggregate the results.\n        return PersistencePromise.forEach(parents, (parent: ResourcePath) => {\n          const collectionQuery = query.asCollectionQueryAtPath(\n            parent.child(collectionId)\n          );\n          return this.getDocumentsMatchingCollectionQuery(\n            transaction,\n            collectionQuery,\n            sinceReadTime\n          ).next(r => {\n            r.forEach((key, doc) => {\n              results = results.insert(key, doc);\n            });\n          });\n        }).next(() => results);\n      });\n  }\n\n  private getDocumentsMatchingCollectionQuery(\n    transaction: PersistenceTransaction,\n    query: Query,\n    sinceReadTime: SnapshotVersion\n  ): PersistencePromise<DocumentMap> {\n    // Query the remote documents and overlay mutations.\n    let results: DocumentMap;\n    let mutationBatches: MutationBatch[];\n    return this.remoteDocumentCache\n      .getDocumentsMatchingQuery(transaction, query, sinceReadTime)\n      .next(queryResults => {\n        results = queryResults;\n        return this.mutationQueue.getAllMutationBatchesAffectingQuery(\n          transaction,\n          query\n        );\n      })\n      .next(matchingMutationBatches => {\n        mutationBatches = matchingMutationBatches;\n        // It is possible that a PatchMutation can make a document match a query, even if\n        // the version in the RemoteDocumentCache is not a match yet (waiting for server\n        // to ack). To handle this, we find all document keys affected by the PatchMutations\n        // that are not in `result` yet, and back fill them via `remoteDocumentCache.getEntries`,\n        // otherwise those `PatchMutations` will be ignored because no base document can be found,\n        // and lead to missing result for the query.\n        return this.addMissingBaseDocuments(\n          transaction,\n          mutationBatches,\n          results\n        ).next(mergedDocuments => {\n          results = mergedDocuments;\n\n          for (const batch of mutationBatches) {\n            for (const mutation of batch.mutations) {\n              const key = mutation.key;\n              const baseDoc = results.get(key);\n              const mutatedDoc = mutation.applyToLocalView(\n                baseDoc,\n                baseDoc,\n                batch.localWriteTime\n              );\n              if (mutatedDoc instanceof Document) {\n                results = results.insert(key, mutatedDoc);\n              } else {\n                results = results.remove(key);\n              }\n            }\n          }\n        });\n      })\n      .next(() => {\n        // Finally, filter out any documents that don't actually match\n        // the query.\n        results.forEach((key, doc) => {\n          if (!query.matches(doc)) {\n            results = results.remove(key);\n          }\n        });\n\n        return results;\n      });\n  }\n\n  private addMissingBaseDocuments(\n    transaction: PersistenceTransaction,\n    matchingMutationBatches: MutationBatch[],\n    existingDocuments: DocumentMap\n  ): PersistencePromise<DocumentMap> {\n    let missingBaseDocEntriesForPatching = documentKeySet();\n    for (const batch of matchingMutationBatches) {\n      for (const mutation of batch.mutations) {\n        if (\n          mutation instanceof PatchMutation &&\n          existingDocuments.get(mutation.key) === null\n        ) {\n          missingBaseDocEntriesForPatching = missingBaseDocEntriesForPatching.add(\n            mutation.key\n          );\n        }\n      }\n    }\n\n    let mergedDocuments = existingDocuments;\n    return this.remoteDocumentCache\n      .getEntries(transaction, missingBaseDocEntriesForPatching)\n      .next(missingBaseDocs => {\n        missingBaseDocs.forEach((key, doc) => {\n          if (doc !== null && doc instanceof Document) {\n            mergedDocuments = mergedDocuments.insert(key, doc);\n          }\n        });\n        return mergedDocuments;\n      });\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { TargetId } from '../core/types';\nimport { ChangeType, ViewSnapshot } from '../core/view_snapshot';\nimport { documentKeySet, DocumentKeySet } from '../model/collections';\n\n/**\n * A set of changes to what documents are currently in view and out of view for\n * a given query. These changes are sent to the LocalStore by the View (via\n * the SyncEngine) and are used to pin / unpin documents as appropriate.\n */\nexport class LocalViewChanges {\n  constructor(\n    readonly targetId: TargetId,\n    readonly fromCache: boolean,\n    readonly addedKeys: DocumentKeySet,\n    readonly removedKeys: DocumentKeySet\n  ) {}\n\n  static fromSnapshot(\n    targetId: TargetId,\n    viewSnapshot: ViewSnapshot\n  ): LocalViewChanges {\n    let addedKeys = documentKeySet();\n    let removedKeys = documentKeySet();\n\n    for (const docChange of viewSnapshot.docChanges) {\n      switch (docChange.type) {\n        case ChangeType.Added:\n          addedKeys = addedKeys.add(docChange.doc.key);\n          break;\n        case ChangeType.Removed:\n          removedKeys = removedKeys.add(docChange.doc.key);\n          break;\n        default:\n        // do nothing\n      }\n    }\n\n    return new LocalViewChanges(\n      targetId,\n      viewSnapshot.fromCache,\n      addedKeys,\n      removedKeys\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2018 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ListenSequenceNumber } from './types';\n\n/**\n * `SequenceNumberSyncer` defines the methods required to keep multiple instances of a\n * `ListenSequence` in sync.\n */\nexport interface SequenceNumberSyncer {\n  // Notify the syncer that a new sequence number has been used.\n  writeSequenceNumber(sequenceNumber: ListenSequenceNumber): void;\n  // Setting this property allows the syncer to notify when a sequence number has been used, and\n  // and lets the ListenSequence adjust its internal previous value accordingly.\n  sequenceNumberHandler:\n    | ((sequenceNumber: ListenSequenceNumber) => void)\n    | null;\n}\n\n/**\n * `ListenSequence` is a monotonic sequence. It is initialized with a minimum value to\n * exceed. All subsequent calls to next will return increasing values. If provided with a\n * `SequenceNumberSyncer`, it will additionally bump its next value when told of a new value, as\n * well as write out sequence numbers that it produces via `next()`.\n */\nexport class ListenSequence {\n  static readonly INVALID: ListenSequenceNumber = -1;\n\n  private writeNewSequenceNumber?: (\n    newSequenceNumber: ListenSequenceNumber\n  ) => void;\n\n  constructor(\n    private previousValue: ListenSequenceNumber,\n    sequenceNumberSyncer?: SequenceNumberSyncer\n  ) {\n    if (sequenceNumberSyncer) {\n      sequenceNumberSyncer.sequenceNumberHandler = sequenceNumber =>\n        this.setPreviousValue(sequenceNumber);\n      this.writeNewSequenceNumber = sequenceNumber =>\n        sequenceNumberSyncer.writeSequenceNumber(sequenceNumber);\n    }\n  }\n\n  private setPreviousValue(\n    externalPreviousValue: ListenSequenceNumber\n  ): ListenSequenceNumber {\n    this.previousValue = Math.max(externalPreviousValue, this.previousValue);\n    return this.previousValue;\n  }\n\n  next(): ListenSequenceNumber {\n    const nextValue = ++this.previousValue;\n    if (this.writeNewSequenceNumber) {\n      this.writeNewSequenceNumber(nextValue);\n    }\n    return nextValue;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nexport interface Resolver<R> {\n  (value?: R | Promise<R>): void;\n}\n\nexport interface Rejecter {\n  (reason?: Error): void;\n}\n\nexport class Deferred<R> {\n  promise: Promise<R>;\n  // Assigned synchronously in constructor by Promise constructor callback.\n  resolve!: Resolver<R>;\n  reject!: Rejecter;\n\n  constructor() {\n    this.promise = new Promise((resolve: Resolver<R>, reject: Rejecter) => {\n      this.resolve = resolve;\n      this.reject = reject;\n    });\n  }\n}\n\n/**\n * Takes an array of values and a function from a value to a Promise. The function is run on each\n * value sequentially, waiting for the previous promise to resolve before starting the next one.\n * The returned promise resolves once the function has been run on all values.\n */\nexport function sequence<T>(\n  values: T[],\n  fn: (value: T) => Promise<void>\n): Promise<void> {\n  let p = Promise.resolve();\n  for (const value of values) {\n    p = p.then(() => fn(value));\n  }\n  return p;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { AsyncQueue, DelayedOperation, TimerId } from '../util/async_queue';\nimport { logDebug } from '../util/log';\n\nconst LOG_TAG = 'ExponentialBackoff';\n\n/**\n * Initial backoff time in milliseconds after an error.\n * Set to 1s according to https://cloud.google.com/apis/design/errors.\n */\nconst DEFAULT_BACKOFF_INITIAL_DELAY_MS = 1000;\n\nconst DEFAULT_BACKOFF_FACTOR = 1.5;\n\n/** Maximum backoff time in milliseconds */\nconst DEFAULT_BACKOFF_MAX_DELAY_MS = 60 * 1000;\n\n/**\n * A helper for running delayed tasks following an exponential backoff curve\n * between attempts.\n *\n * Each delay is made up of a \"base\" delay which follows the exponential\n * backoff curve, and a +/- 50% \"jitter\" that is calculated and added to the\n * base delay. This prevents clients from accidentally synchronizing their\n * delays causing spikes of load to the backend.\n */\nexport class ExponentialBackoff {\n  private currentBaseMs: number = 0;\n  private timerPromise: DelayedOperation<void> | null = null;\n  /** The last backoff attempt, as epoch milliseconds. */\n  private lastAttemptTime = Date.now();\n\n  constructor(\n    /**\n     * The AsyncQueue to run backoff operations on.\n     */\n    private readonly queue: AsyncQueue,\n    /**\n     * The ID to use when scheduling backoff operations on the AsyncQueue.\n     */\n    private readonly timerId: TimerId,\n    /**\n     * The initial delay (used as the base delay on the first retry attempt).\n     * Note that jitter will still be applied, so the actual delay could be as\n     * little as 0.5*initialDelayMs.\n     */\n    private readonly initialDelayMs: number = DEFAULT_BACKOFF_INITIAL_DELAY_MS,\n    /**\n     * The multiplier to use to determine the extended base delay after each\n     * attempt.\n     */\n    private readonly backoffFactor: number = DEFAULT_BACKOFF_FACTOR,\n    /**\n     * The maximum base delay after which no further backoff is performed.\n     * Note that jitter will still be applied, so the actual delay could be as\n     * much as 1.5*maxDelayMs.\n     */\n    private readonly maxDelayMs: number = DEFAULT_BACKOFF_MAX_DELAY_MS\n  ) {\n    this.reset();\n  }\n\n  /**\n   * Resets the backoff delay.\n   *\n   * The very next backoffAndWait() will have no delay. If it is called again\n   * (i.e. due to an error), initialDelayMs (plus jitter) will be used, and\n   * subsequent ones will increase according to the backoffFactor.\n   */\n  reset(): void {\n    this.currentBaseMs = 0;\n  }\n\n  /**\n   * Resets the backoff delay to the maximum delay (e.g. for use after a\n   * RESOURCE_EXHAUSTED error).\n   */\n  resetToMax(): void {\n    this.currentBaseMs = this.maxDelayMs;\n  }\n\n  /**\n   * Returns a promise that resolves after currentDelayMs, and increases the\n   * delay for any subsequent attempts. If there was a pending backoff operation\n   * already, it will be canceled.\n   */\n  backoffAndRun(op: () => Promise<void>): void {\n    // Cancel any pending backoff operation.\n    this.cancel();\n\n    // First schedule using the current base (which may be 0 and should be\n    // honored as such).\n    const desiredDelayWithJitterMs = Math.floor(\n      this.currentBaseMs + this.jitterDelayMs()\n    );\n\n    // Guard against lastAttemptTime being in the future due to a clock change.\n    const delaySoFarMs = Math.max(0, Date.now() - this.lastAttemptTime);\n\n    // Guard against the backoff delay already being past.\n    const remainingDelayMs = Math.max(\n      0,\n      desiredDelayWithJitterMs - delaySoFarMs\n    );\n\n    if (remainingDelayMs > 0) {\n      logDebug(\n        LOG_TAG,\n        `Backing off for ${remainingDelayMs} ms ` +\n          `(base delay: ${this.currentBaseMs} ms, ` +\n          `delay with jitter: ${desiredDelayWithJitterMs} ms, ` +\n          `last attempt: ${delaySoFarMs} ms ago)`\n      );\n    }\n\n    this.timerPromise = this.queue.enqueueAfterDelay(\n      this.timerId,\n      remainingDelayMs,\n      () => {\n        this.lastAttemptTime = Date.now();\n        return op();\n      }\n    );\n\n    // Apply backoff factor to determine next delay and ensure it is within\n    // bounds.\n    this.currentBaseMs *= this.backoffFactor;\n    if (this.currentBaseMs < this.initialDelayMs) {\n      this.currentBaseMs = this.initialDelayMs;\n    }\n    if (this.currentBaseMs > this.maxDelayMs) {\n      this.currentBaseMs = this.maxDelayMs;\n    }\n  }\n\n  skipBackoff(): void {\n    if (this.timerPromise !== null) {\n      this.timerPromise.skipDelay();\n      this.timerPromise = null;\n    }\n  }\n\n  cancel(): void {\n    if (this.timerPromise !== null) {\n      this.timerPromise.cancel();\n      this.timerPromise = null;\n    }\n  }\n\n  /** Returns a random value in the range [-currentBaseMs/2, currentBaseMs/2] */\n  private jitterDelayMs(): number {\n    return (Math.random() - 0.5) * this.currentBaseMs;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ResourcePath } from '../model/path';\nimport { fail, hardAssert } from '../util/assert';\n\n/**\n * Helpers for dealing with resource paths stored in IndexedDB.\n *\n * Resource paths in their canonical string form do not sort as the server\n * sorts them. Specifically the server splits paths into segments first and then\n * sorts, putting end-of-segment before any character. In a UTF-8 string\n * encoding the slash ('/') that denotes the end-of-segment naturally comes\n * after other characters so the intent here is to encode the path delimiters in\n * such a way that the resulting strings sort naturally.\n *\n * Resource paths are also used for prefix scans so it's important to\n * distinguish whole segments from any longer segments of which they might be a\n * prefix. For example, it's important to make it possible to scan documents in\n * a collection \"foo\" without encountering documents in a collection \"foobar\".\n *\n * Separate from the concerns about resource path ordering and separation,\n * On Android, SQLite imposes additional restrictions since it does not handle\n * keys with embedded NUL bytes particularly well. Rather than change the\n * implementation we keep the encoding identical to keep the ports similar.\n *\n * Taken together this means resource paths when encoded for storage in\n * IndexedDB have the following characteristics:\n *\n *   * Segment separators (\"/\") sort before everything else.\n *   * All paths have a trailing separator.\n *   * NUL bytes do not exist in the output, since IndexedDB doesn't treat them\n * well.\n *\n * Therefore resource paths are encoded into string form using the following\n * rules:\n *\n *   * '\\x01' is used as an escape character.\n *   * Path separators are encoded as \"\\x01\\x01\"\n *   * NUL bytes are encoded as \"\\x01\\x10\"\n *   * '\\x01' is encoded as \"\\x01\\x11\"\n *\n * This encoding leaves some room between path separators and the NUL byte\n * just in case we decide to support integer document ids after all.\n *\n * Note that characters treated specially by the backend ('.', '/', and '~')\n * are not treated specially here. This class assumes that any unescaping of\n * resource path strings into actual ResourcePath objects will handle these\n * characters there.\n */\nexport type EncodedResourcePath = string;\n\nconst escapeChar = '\\u0001';\nconst encodedSeparatorChar = '\\u0001';\nconst encodedNul = '\\u0010';\nconst encodedEscape = '\\u0011';\n\n/**\n * Encodes a resource path into a IndexedDb-compatible string form.\n */\nexport function encodeResourcePath(path: ResourcePath): EncodedResourcePath {\n  let result = '';\n  for (let i = 0; i < path.length; i++) {\n    if (result.length > 0) {\n      result = encodeSeparator(result);\n    }\n    result = encodeSegment(path.get(i), result);\n  }\n  return encodeSeparator(result);\n}\n\n/** Encodes a single segment of a resource path into the given result */\nfunction encodeSegment(segment: string, resultBuf: string): string {\n  let result = resultBuf;\n  const length = segment.length;\n  for (let i = 0; i < length; i++) {\n    const c = segment.charAt(i);\n    switch (c) {\n      case '\\0':\n        result += escapeChar + encodedNul;\n        break;\n      case escapeChar:\n        result += escapeChar + encodedEscape;\n        break;\n      default:\n        result += c;\n    }\n  }\n  return result;\n}\n\n/** Encodes a path separator into the given result */\nfunction encodeSeparator(result: string): string {\n  return result + escapeChar + encodedSeparatorChar;\n}\n\n/**\n * Decodes the given IndexedDb-compatible string form of a resource path into\n * a ResourcePath instance. Note that this method is not suitable for use with\n * decoding resource names from the server; those are One Platform format\n * strings.\n */\nexport function decodeResourcePath(path: EncodedResourcePath): ResourcePath {\n  // Event the empty path must encode as a path of at least length 2. A path\n  // with exactly 2 must be the empty path.\n  const length = path.length;\n  hardAssert(length >= 2, 'Invalid path ' + path);\n  if (length === 2) {\n    hardAssert(\n      path.charAt(0) === escapeChar && path.charAt(1) === encodedSeparatorChar,\n      'Non-empty path ' + path + ' had length 2'\n    );\n    return ResourcePath.EMPTY_PATH;\n  }\n\n  // Escape characters cannot exist past the second-to-last position in the\n  // source value.\n  const lastReasonableEscapeIndex = length - 2;\n\n  const segments: string[] = [];\n  let segmentBuilder = '';\n\n  for (let start = 0; start < length; ) {\n    // The last two characters of a valid encoded path must be a separator, so\n    // there must be an end to this segment.\n    const end = path.indexOf(escapeChar, start);\n    if (end < 0 || end > lastReasonableEscapeIndex) {\n      fail('Invalid encoded resource path: \"' + path + '\"');\n    }\n\n    const next = path.charAt(end + 1);\n    switch (next) {\n      case encodedSeparatorChar:\n        const currentPiece = path.substring(start, end);\n        let segment;\n        if (segmentBuilder.length === 0) {\n          // Avoid copying for the common case of a segment that excludes \\0\n          // and \\001\n          segment = currentPiece;\n        } else {\n          segmentBuilder += currentPiece;\n          segment = segmentBuilder;\n          segmentBuilder = '';\n        }\n        segments.push(segment);\n        break;\n      case encodedNul:\n        segmentBuilder += path.substring(start, end);\n        segmentBuilder += '\\0';\n        break;\n      case encodedEscape:\n        // The escape character can be used in the output to encode itself.\n        segmentBuilder += path.substring(start, end + 1);\n        break;\n      default:\n        fail('Invalid encoded resource path: \"' + path + '\"');\n    }\n\n    start = end + 2;\n  }\n\n  return new ResourcePath(segments);\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ResourcePath } from '../model/path';\nimport { debugAssert } from '../util/assert';\nimport { SortedSet } from '../util/sorted_set';\nimport { IndexManager } from './index_manager';\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\n\n/**\n * An in-memory implementation of IndexManager.\n */\nexport class MemoryIndexManager implements IndexManager {\n  private collectionParentIndex = new MemoryCollectionParentIndex();\n\n  addToCollectionParentIndex(\n    transaction: PersistenceTransaction,\n    collectionPath: ResourcePath\n  ): PersistencePromise<void> {\n    this.collectionParentIndex.add(collectionPath);\n    return PersistencePromise.resolve();\n  }\n\n  getCollectionParents(\n    transaction: PersistenceTransaction,\n    collectionId: string\n  ): PersistencePromise<ResourcePath[]> {\n    return PersistencePromise.resolve(\n      this.collectionParentIndex.getEntries(collectionId)\n    );\n  }\n}\n\n/**\n * Internal implementation of the collection-parent index exposed by MemoryIndexManager.\n * Also used for in-memory caching by IndexedDbIndexManager and initial index population\n * in indexeddb_schema.ts\n */\nexport class MemoryCollectionParentIndex {\n  private index = {} as {\n    [collectionId: string]: SortedSet<ResourcePath>;\n  };\n\n  // Returns false if the entry already existed.\n  add(collectionPath: ResourcePath): boolean {\n    debugAssert(collectionPath.length % 2 === 1, 'Expected a collection path.');\n    const collectionId = collectionPath.lastSegment();\n    const parentPath = collectionPath.popLast();\n    const existingParents =\n      this.index[collectionId] ||\n      new SortedSet<ResourcePath>(ResourcePath.comparator);\n    const added = !existingParents.has(parentPath);\n    this.index[collectionId] = existingParents.add(parentPath);\n    return added;\n  }\n\n  has(collectionPath: ResourcePath): boolean {\n    const collectionId = collectionPath.lastSegment();\n    const parentPath = collectionPath.popLast();\n    const existingParents = this.index[collectionId];\n    return existingParents && existingParents.has(parentPath);\n  }\n\n  getEntries(collectionId: string): ResourcePath[] {\n    const parentPaths =\n      this.index[collectionId] ||\n      new SortedSet<ResourcePath>(ResourcePath.comparator);\n    return parentPaths.toArray();\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ResourcePath } from '../model/path';\nimport { debugAssert } from '../util/assert';\nimport { immediateSuccessor } from '../util/misc';\nimport {\n  decodeResourcePath,\n  encodeResourcePath\n} from './encoded_resource_path';\nimport { IndexManager } from './index_manager';\nimport { IndexedDbPersistence } from './indexeddb_persistence';\nimport { DbCollectionParent, DbCollectionParentKey } from './indexeddb_schema';\nimport { MemoryCollectionParentIndex } from './memory_index_manager';\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { SimpleDbStore } from './simple_db';\n\n/**\n * A persisted implementation of IndexManager.\n */\nexport class IndexedDbIndexManager implements IndexManager {\n  /**\n   * An in-memory copy of the index entries we've already written since the SDK\n   * launched. Used to avoid re-writing the same entry repeatedly.\n   *\n   * This is *NOT* a complete cache of what's in persistence and so can never be used to\n   * satisfy reads.\n   */\n  private collectionParentsCache = new MemoryCollectionParentIndex();\n\n  /**\n   * Adds a new entry to the collection parent index.\n   *\n   * Repeated calls for the same collectionPath should be avoided within a\n   * transaction as IndexedDbIndexManager only caches writes once a transaction\n   * has been committed.\n   */\n  addToCollectionParentIndex(\n    transaction: PersistenceTransaction,\n    collectionPath: ResourcePath\n  ): PersistencePromise<void> {\n    debugAssert(collectionPath.length % 2 === 1, 'Expected a collection path.');\n    if (!this.collectionParentsCache.has(collectionPath)) {\n      const collectionId = collectionPath.lastSegment();\n      const parentPath = collectionPath.popLast();\n\n      transaction.addOnCommittedListener(() => {\n        // Add the collection to the in memory cache only if the transaction was\n        // successfully committed.\n        this.collectionParentsCache.add(collectionPath);\n      });\n\n      const collectionParent: DbCollectionParent = {\n        collectionId,\n        parent: encodeResourcePath(parentPath)\n      };\n      return collectionParentsStore(transaction).put(collectionParent);\n    }\n    return PersistencePromise.resolve();\n  }\n\n  getCollectionParents(\n    transaction: PersistenceTransaction,\n    collectionId: string\n  ): PersistencePromise<ResourcePath[]> {\n    const parentPaths = [] as ResourcePath[];\n    const range = IDBKeyRange.bound(\n      [collectionId, ''],\n      [immediateSuccessor(collectionId), ''],\n      /*lowerOpen=*/ false,\n      /*upperOpen=*/ true\n    );\n    return collectionParentsStore(transaction)\n      .loadAll(range)\n      .next(entries => {\n        for (const entry of entries) {\n          // This collectionId guard shouldn't be necessary (and isn't as long\n          // as we're running in a real browser), but there's a bug in\n          // indexeddbshim that breaks our range in our tests running in node:\n          // https://github.com/axemclion/IndexedDBShim/issues/334\n          if (entry.collectionId !== collectionId) {\n            break;\n          }\n          parentPaths.push(decodeResourcePath(entry.parent));\n        }\n        return parentPaths;\n      });\n  }\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the collectionParents\n * document store.\n */\nfunction collectionParentsStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbCollectionParentKey, DbCollectionParent> {\n  return IndexedDbPersistence.getStore<\n    DbCollectionParentKey,\n    DbCollectionParent\n  >(txn, DbCollectionParent.store);\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Query } from '../core/query';\nimport {\n  DocumentKeySet,\n  DocumentMap,\n  documentMap,\n  DocumentSizeEntries,\n  DocumentSizeEntry,\n  MaybeDocumentMap,\n  maybeDocumentMap,\n  nullableMaybeDocumentMap,\n  NullableMaybeDocumentMap\n} from '../model/collections';\nimport { Document, MaybeDocument, NoDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { ResourcePath } from '../model/path';\nimport { primitiveComparator } from '../util/misc';\nimport { SortedMap } from '../util/sorted_map';\nimport { SortedSet } from '../util/sorted_set';\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { debugAssert, fail, hardAssert } from '../util/assert';\nimport { IndexManager } from './index_manager';\nimport { IndexedDbPersistence } from './indexeddb_persistence';\nimport {\n  DbRemoteDocument,\n  DbRemoteDocumentGlobal,\n  DbRemoteDocumentGlobalKey,\n  DbRemoteDocumentKey\n} from './indexeddb_schema';\nimport { LocalSerializer } from './local_serializer';\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { RemoteDocumentCache } from './remote_document_cache';\nimport { RemoteDocumentChangeBuffer } from './remote_document_change_buffer';\nimport { IterateOptions, SimpleDbStore } from './simple_db';\nimport { ObjectMap } from '../util/obj_map';\n\nexport class IndexedDbRemoteDocumentCache implements RemoteDocumentCache {\n  /**\n   * @param {LocalSerializer} serializer The document serializer.\n   * @param {IndexManager} indexManager The query indexes that need to be maintained.\n   */\n  constructor(\n    readonly serializer: LocalSerializer,\n    private readonly indexManager: IndexManager\n  ) {}\n\n  /**\n   * Adds the supplied entries to the cache.\n   *\n   * All calls of `addEntry` are required to go through the RemoteDocumentChangeBuffer\n   * returned by `newChangeBuffer()` to ensure proper accounting of metadata.\n   */\n  private addEntry(\n    transaction: PersistenceTransaction,\n    key: DocumentKey,\n    doc: DbRemoteDocument\n  ): PersistencePromise<void> {\n    const documentStore = remoteDocumentsStore(transaction);\n    return documentStore.put(dbKey(key), doc);\n  }\n\n  /**\n   * Removes a document from the cache.\n   *\n   * All calls of `removeEntry`  are required to go through the RemoteDocumentChangeBuffer\n   * returned by `newChangeBuffer()` to ensure proper accounting of metadata.\n   */\n  private removeEntry(\n    transaction: PersistenceTransaction,\n    documentKey: DocumentKey\n  ): PersistencePromise<void> {\n    const store = remoteDocumentsStore(transaction);\n    const key = dbKey(documentKey);\n    return store.delete(key);\n  }\n\n  /**\n   * Updates the current cache size.\n   *\n   * Callers to `addEntry()` and `removeEntry()` *must* call this afterwards to update the\n   * cache's metadata.\n   */\n  private updateMetadata(\n    transaction: PersistenceTransaction,\n    sizeDelta: number\n  ): PersistencePromise<void> {\n    return this.getMetadata(transaction).next(metadata => {\n      metadata.byteSize += sizeDelta;\n      return this.setMetadata(transaction, metadata);\n    });\n  }\n\n  getEntry(\n    transaction: PersistenceTransaction,\n    documentKey: DocumentKey\n  ): PersistencePromise<MaybeDocument | null> {\n    return remoteDocumentsStore(transaction)\n      .get(dbKey(documentKey))\n      .next(dbRemoteDoc => {\n        return this.maybeDecodeDocument(dbRemoteDoc);\n      });\n  }\n\n  /**\n   * Looks up an entry in the cache.\n   *\n   * @param documentKey The key of the entry to look up.\n   * @return The cached MaybeDocument entry and its size, or null if we have nothing cached.\n   */\n  getSizedEntry(\n    transaction: PersistenceTransaction,\n    documentKey: DocumentKey\n  ): PersistencePromise<DocumentSizeEntry | null> {\n    return remoteDocumentsStore(transaction)\n      .get(dbKey(documentKey))\n      .next(dbRemoteDoc => {\n        const doc = this.maybeDecodeDocument(dbRemoteDoc);\n        return doc\n          ? {\n              maybeDocument: doc,\n              size: dbDocumentSize(dbRemoteDoc!)\n            }\n          : null;\n      });\n  }\n\n  getEntries(\n    transaction: PersistenceTransaction,\n    documentKeys: DocumentKeySet\n  ): PersistencePromise<NullableMaybeDocumentMap> {\n    let results = nullableMaybeDocumentMap();\n    return this.forEachDbEntry(\n      transaction,\n      documentKeys,\n      (key, dbRemoteDoc) => {\n        const doc = this.maybeDecodeDocument(dbRemoteDoc);\n        results = results.insert(key, doc);\n      }\n    ).next(() => results);\n  }\n\n  /**\n   * Looks up several entries in the cache.\n   *\n   * @param documentKeys The set of keys entries to look up.\n   * @return A map of MaybeDocuments indexed by key (if a document cannot be\n   *     found, the key will be mapped to null) and a map of sizes indexed by\n   *     key (zero if the key cannot be found).\n   */\n  getSizedEntries(\n    transaction: PersistenceTransaction,\n    documentKeys: DocumentKeySet\n  ): PersistencePromise<DocumentSizeEntries> {\n    let results = nullableMaybeDocumentMap();\n    let sizeMap = new SortedMap<DocumentKey, number>(DocumentKey.comparator);\n    return this.forEachDbEntry(\n      transaction,\n      documentKeys,\n      (key, dbRemoteDoc) => {\n        const doc = this.maybeDecodeDocument(dbRemoteDoc);\n        if (doc) {\n          results = results.insert(key, doc);\n          sizeMap = sizeMap.insert(key, dbDocumentSize(dbRemoteDoc!));\n        } else {\n          results = results.insert(key, null);\n          sizeMap = sizeMap.insert(key, 0);\n        }\n      }\n    ).next(() => {\n      return { maybeDocuments: results, sizeMap };\n    });\n  }\n\n  private forEachDbEntry(\n    transaction: PersistenceTransaction,\n    documentKeys: DocumentKeySet,\n    callback: (key: DocumentKey, doc: DbRemoteDocument | null) => void\n  ): PersistencePromise<void> {\n    if (documentKeys.isEmpty()) {\n      return PersistencePromise.resolve();\n    }\n\n    const range = IDBKeyRange.bound(\n      documentKeys.first()!.path.toArray(),\n      documentKeys.last()!.path.toArray()\n    );\n    const keyIter = documentKeys.getIterator();\n    let nextKey: DocumentKey | null = keyIter.getNext();\n\n    return remoteDocumentsStore(transaction)\n      .iterate({ range }, (potentialKeyRaw, dbRemoteDoc, control) => {\n        const potentialKey = DocumentKey.fromSegments(potentialKeyRaw);\n\n        // Go through keys not found in cache.\n        while (nextKey && DocumentKey.comparator(nextKey!, potentialKey) < 0) {\n          callback(nextKey!, null);\n          nextKey = keyIter.getNext();\n        }\n\n        if (nextKey && nextKey!.isEqual(potentialKey)) {\n          // Key found in cache.\n          callback(nextKey!, dbRemoteDoc);\n          nextKey = keyIter.hasNext() ? keyIter.getNext() : null;\n        }\n\n        // Skip to the next key (if there is one).\n        if (nextKey) {\n          control.skip(nextKey!.path.toArray());\n        } else {\n          control.done();\n        }\n      })\n      .next(() => {\n        // The rest of the keys are not in the cache. One case where `iterate`\n        // above won't go through them is when the cache is empty.\n        while (nextKey) {\n          callback(nextKey!, null);\n          nextKey = keyIter.hasNext() ? keyIter.getNext() : null;\n        }\n      });\n  }\n\n  getDocumentsMatchingQuery(\n    transaction: PersistenceTransaction,\n    query: Query,\n    sinceReadTime: SnapshotVersion\n  ): PersistencePromise<DocumentMap> {\n    debugAssert(\n      !query.isCollectionGroupQuery(),\n      'CollectionGroup queries should be handled in LocalDocumentsView'\n    );\n    let results = documentMap();\n\n    const immediateChildrenPathLength = query.path.length + 1;\n\n    const iterationOptions: IterateOptions = {};\n    if (sinceReadTime.isEqual(SnapshotVersion.min())) {\n      // Documents are ordered by key, so we can use a prefix scan to narrow\n      // down the documents we need to match the query against.\n      const startKey = query.path.toArray();\n      iterationOptions.range = IDBKeyRange.lowerBound(startKey);\n    } else {\n      // Execute an index-free query and filter by read time. This is safe\n      // since all document changes to queries that have a\n      // lastLimboFreeSnapshotVersion (`sinceReadTime`) have a read time set.\n      const collectionKey = query.path.toArray();\n      const readTimeKey = this.serializer.toDbTimestampKey(sinceReadTime);\n      iterationOptions.range = IDBKeyRange.lowerBound(\n        [collectionKey, readTimeKey],\n        /* open= */ true\n      );\n      iterationOptions.index = DbRemoteDocument.collectionReadTimeIndex;\n    }\n\n    return remoteDocumentsStore(transaction)\n      .iterate(iterationOptions, (key, dbRemoteDoc, control) => {\n        // The query is actually returning any path that starts with the query\n        // path prefix which may include documents in subcollections. For\n        // example, a query on 'rooms' will return rooms/abc/messages/xyx but we\n        // shouldn't match it. Fix this by discarding rows with document keys\n        // more than one segment longer than the query path.\n        if (key.length !== immediateChildrenPathLength) {\n          return;\n        }\n\n        const maybeDoc = this.serializer.fromDbRemoteDocument(dbRemoteDoc);\n        if (!query.path.isPrefixOf(maybeDoc.key.path)) {\n          control.done();\n        } else if (maybeDoc instanceof Document && query.matches(maybeDoc)) {\n          results = results.insert(maybeDoc.key, maybeDoc);\n        }\n      })\n      .next(() => results);\n  }\n\n  /**\n   * Returns the set of documents that have changed since the specified read\n   * time.\n   */\n  // PORTING NOTE: This is only used for multi-tab synchronization.\n  getNewDocumentChanges(\n    transaction: PersistenceTransaction,\n    sinceReadTime: SnapshotVersion\n  ): PersistencePromise<{\n    changedDocs: MaybeDocumentMap;\n    readTime: SnapshotVersion;\n  }> {\n    let changedDocs = maybeDocumentMap();\n\n    let lastReadTime = this.serializer.toDbTimestampKey(sinceReadTime);\n\n    const documentsStore = remoteDocumentsStore(transaction);\n    const range = IDBKeyRange.lowerBound(lastReadTime, true);\n    return documentsStore\n      .iterate(\n        { index: DbRemoteDocument.readTimeIndex, range },\n        (_, dbRemoteDoc) => {\n          // Unlike `getEntry()` and others, `getNewDocumentChanges()` parses\n          // the documents directly since we want to keep sentinel deletes.\n          const doc = this.serializer.fromDbRemoteDocument(dbRemoteDoc);\n          changedDocs = changedDocs.insert(doc.key, doc);\n          lastReadTime = dbRemoteDoc.readTime!;\n        }\n      )\n      .next(() => {\n        return {\n          changedDocs,\n          readTime: this.serializer.fromDbTimestampKey(lastReadTime)\n        };\n      });\n  }\n\n  /**\n   * Returns the read time of the most recently read document in the cache, or\n   * SnapshotVersion.min() if not available.\n   */\n  // PORTING NOTE: This is only used for multi-tab synchronization.\n  getLastReadTime(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<SnapshotVersion> {\n    const documentsStore = remoteDocumentsStore(transaction);\n\n    // If there are no existing entries, we return SnapshotVersion.min().\n    let readTime = SnapshotVersion.min();\n\n    return documentsStore\n      .iterate(\n        { index: DbRemoteDocument.readTimeIndex, reverse: true },\n        (key, dbRemoteDoc, control) => {\n          if (dbRemoteDoc.readTime) {\n            readTime = this.serializer.fromDbTimestampKey(dbRemoteDoc.readTime);\n          }\n          control.done();\n        }\n      )\n      .next(() => readTime);\n  }\n\n  newChangeBuffer(options?: {\n    trackRemovals: boolean;\n  }): RemoteDocumentChangeBuffer {\n    return new IndexedDbRemoteDocumentCache.RemoteDocumentChangeBuffer(\n      this,\n      !!options && options.trackRemovals\n    );\n  }\n\n  getSize(txn: PersistenceTransaction): PersistencePromise<number> {\n    return this.getMetadata(txn).next(metadata => metadata.byteSize);\n  }\n\n  private getMetadata(\n    txn: PersistenceTransaction\n  ): PersistencePromise<DbRemoteDocumentGlobal> {\n    return documentGlobalStore(txn)\n      .get(DbRemoteDocumentGlobal.key)\n      .next(metadata => {\n        hardAssert(!!metadata, 'Missing document cache metadata');\n        return metadata!;\n      });\n  }\n\n  private setMetadata(\n    txn: PersistenceTransaction,\n    metadata: DbRemoteDocumentGlobal\n  ): PersistencePromise<void> {\n    return documentGlobalStore(txn).put(DbRemoteDocumentGlobal.key, metadata);\n  }\n\n  /**\n   * Decodes `remoteDoc` and returns the document (or null, if the document\n   * corresponds to the format used for sentinel deletes).\n   */\n  private maybeDecodeDocument(\n    dbRemoteDoc: DbRemoteDocument | null\n  ): MaybeDocument | null {\n    if (dbRemoteDoc) {\n      const doc = this.serializer.fromDbRemoteDocument(dbRemoteDoc);\n      if (\n        doc instanceof NoDocument &&\n        doc.version.isEqual(SnapshotVersion.min())\n      ) {\n        // The document is a sentinel removal and should only be used in the\n        // `getNewDocumentChanges()`.\n        return null;\n      }\n\n      return doc;\n    }\n    return null;\n  }\n\n  /**\n   * Handles the details of adding and updating documents in the IndexedDbRemoteDocumentCache.\n   *\n   * Unlike the MemoryRemoteDocumentChangeBuffer, the IndexedDb implementation computes the size\n   * delta for all submitted changes. This avoids having to re-read all documents from IndexedDb\n   * when we apply the changes.\n   */\n  private static RemoteDocumentChangeBuffer = class extends RemoteDocumentChangeBuffer {\n    // A map of document sizes prior to applying the changes in this buffer.\n    protected documentSizes: ObjectMap<\n      DocumentKey,\n      number\n    > = new ObjectMap(key => key.toString());\n\n    /**\n     * @param documentCache The IndexedDbRemoteDocumentCache to apply the changes to.\n     * @param trackRemovals Whether to create sentinel deletes that can be tracked by\n     * `getNewDocumentChanges()`.\n     */\n    constructor(\n      private readonly documentCache: IndexedDbRemoteDocumentCache,\n      private readonly trackRemovals: boolean\n    ) {\n      super();\n    }\n\n    protected applyChanges(\n      transaction: PersistenceTransaction\n    ): PersistencePromise<void> {\n      const promises: Array<PersistencePromise<void>> = [];\n\n      let sizeDelta = 0;\n\n      let collectionParents = new SortedSet<ResourcePath>((l, r) =>\n        primitiveComparator(l.canonicalString(), r.canonicalString())\n      );\n\n      this.changes.forEach((key, maybeDocument) => {\n        const previousSize = this.documentSizes.get(key);\n        debugAssert(\n          previousSize !== undefined,\n          `Cannot modify a document that wasn't read (for ${key})`\n        );\n        if (maybeDocument) {\n          debugAssert(\n            !this.readTime.isEqual(SnapshotVersion.min()),\n            'Cannot add a document with a read time of zero'\n          );\n          const doc = this.documentCache.serializer.toDbRemoteDocument(\n            maybeDocument,\n            this.readTime\n          );\n          collectionParents = collectionParents.add(key.path.popLast());\n\n          const size = dbDocumentSize(doc);\n          sizeDelta += size - previousSize!;\n          promises.push(this.documentCache.addEntry(transaction, key, doc));\n        } else {\n          sizeDelta -= previousSize!;\n          if (this.trackRemovals) {\n            // In order to track removals, we store a \"sentinel delete\" in the\n            // RemoteDocumentCache. This entry is represented by a NoDocument\n            // with a version of 0 and ignored by `maybeDecodeDocument()` but\n            // preserved in `getNewDocumentChanges()`.\n            const deletedDoc = this.documentCache.serializer.toDbRemoteDocument(\n              new NoDocument(key, SnapshotVersion.min()),\n              this.readTime\n            );\n            promises.push(\n              this.documentCache.addEntry(transaction, key, deletedDoc)\n            );\n          } else {\n            promises.push(this.documentCache.removeEntry(transaction, key));\n          }\n        }\n      });\n\n      collectionParents.forEach(parent => {\n        promises.push(\n          this.documentCache.indexManager.addToCollectionParentIndex(\n            transaction,\n            parent\n          )\n        );\n      });\n\n      promises.push(this.documentCache.updateMetadata(transaction, sizeDelta));\n\n      return PersistencePromise.waitFor(promises);\n    }\n\n    protected getFromCache(\n      transaction: PersistenceTransaction,\n      documentKey: DocumentKey\n    ): PersistencePromise<MaybeDocument | null> {\n      // Record the size of everything we load from the cache so we can compute a delta later.\n      return this.documentCache\n        .getSizedEntry(transaction, documentKey)\n        .next(getResult => {\n          if (getResult === null) {\n            this.documentSizes.set(documentKey, 0);\n            return null;\n          } else {\n            this.documentSizes.set(documentKey, getResult.size);\n            return getResult.maybeDocument;\n          }\n        });\n    }\n\n    protected getAllFromCache(\n      transaction: PersistenceTransaction,\n      documentKeys: DocumentKeySet\n    ): PersistencePromise<NullableMaybeDocumentMap> {\n      // Record the size of everything we load from the cache so we can compute\n      // a delta later.\n      return this.documentCache\n        .getSizedEntries(transaction, documentKeys)\n        .next(({ maybeDocuments, sizeMap }) => {\n          // Note: `getAllFromCache` returns two maps instead of a single map from\n          // keys to `DocumentSizeEntry`s. This is to allow returning the\n          // `NullableMaybeDocumentMap` directly, without a conversion.\n          sizeMap.forEach((documentKey, size) => {\n            this.documentSizes.set(documentKey, size);\n          });\n          return maybeDocuments;\n        });\n    }\n  };\n}\n\nfunction documentGlobalStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbRemoteDocumentGlobalKey, DbRemoteDocumentGlobal> {\n  return IndexedDbPersistence.getStore<\n    DbRemoteDocumentGlobalKey,\n    DbRemoteDocumentGlobal\n  >(txn, DbRemoteDocumentGlobal.store);\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the remoteDocuments object store.\n */\nfunction remoteDocumentsStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbRemoteDocumentKey, DbRemoteDocument> {\n  return IndexedDbPersistence.getStore<DbRemoteDocumentKey, DbRemoteDocument>(\n    txn,\n    DbRemoteDocument.store\n  );\n}\n\nfunction dbKey(docKey: DocumentKey): DbRemoteDocumentKey {\n  return docKey.path.toArray();\n}\n\n/**\n * Retrusn an approximate size for the given document.\n */\nexport function dbDocumentSize(doc: DbRemoteDocument): number {\n  let value: unknown;\n  if (doc.document) {\n    value = doc.document;\n  } else if (doc.unknownDocument) {\n    value = doc.unknownDocument;\n  } else if (doc.noDocument) {\n    value = doc.noDocument;\n  } else {\n    throw fail('Unknown remote document type');\n  }\n  return JSON.stringify(value).length;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { TargetId } from './types';\n\n/** Offset to ensure non-overlapping target ids. */\nconst OFFSET = 2;\n\n/**\n * Generates monotonically increasing target IDs for sending targets to the\n * watch stream.\n *\n * The client constructs two generators, one for the target cache, and one for\n * for the sync engine (to generate limbo documents targets). These\n * generators produce non-overlapping IDs (by using even and odd IDs\n * respectively).\n *\n * By separating the target ID space, the query cache can generate target IDs\n * that persist across client restarts, while sync engine can independently\n * generate in-memory target IDs that are transient and can be reused after a\n * restart.\n */\nexport class TargetIdGenerator {\n  constructor(private lastId: number) {}\n\n  next(): TargetId {\n    this.lastId += OFFSET;\n    return this.lastId;\n  }\n\n  static forTargetCache(): TargetIdGenerator {\n    // The target cache generator must return '2' in its first call to `next()`\n    // as there is no differentiation in the protocol layer between an unset\n    // number and the number '0'. If we were to sent a target with target ID\n    // '0', the backend would consider it unset and replace it with its own ID.\n    return new TargetIdGenerator(2 - OFFSET);\n  }\n\n  static forSyncEngine(): TargetIdGenerator {\n    // Sync engine assigns target IDs for limbo document detection.\n    return new TargetIdGenerator(1 - OFFSET);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Timestamp } from '../api/timestamp';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { ListenSequenceNumber, TargetId } from '../core/types';\nimport { DocumentKeySet, documentKeySet } from '../model/collections';\nimport { DocumentKey } from '../model/document_key';\nimport { hardAssert } from '../util/assert';\nimport { immediateSuccessor } from '../util/misc';\nimport { TargetIdGenerator } from '../core/target_id_generator';\nimport {\n  decodeResourcePath,\n  encodeResourcePath\n} from './encoded_resource_path';\nimport {\n  IndexedDbLruDelegate,\n  IndexedDbPersistence\n} from './indexeddb_persistence';\nimport {\n  DbTarget,\n  DbTargetDocument,\n  DbTargetDocumentKey,\n  DbTargetGlobal,\n  DbTargetGlobalKey,\n  DbTargetKey\n} from './indexeddb_schema';\nimport { LocalSerializer } from './local_serializer';\nimport { ActiveTargets } from './lru_garbage_collector';\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { TargetCache } from './target_cache';\nimport { TargetData } from './target_data';\nimport { SimpleDbStore } from './simple_db';\nimport { Target } from '../core/target';\n\nexport class IndexedDbTargetCache implements TargetCache {\n  constructor(\n    private readonly referenceDelegate: IndexedDbLruDelegate,\n    private serializer: LocalSerializer\n  ) {}\n\n  // PORTING NOTE: We don't cache global metadata for the target cache, since\n  // some of it (in particular `highestTargetId`) can be modified by secondary\n  // tabs. We could perhaps be more granular (and e.g. still cache\n  // `lastRemoteSnapshotVersion` in memory) but for simplicity we currently go\n  // to IndexedDb whenever we need to read metadata. We can revisit if it turns\n  // out to have a meaningful performance impact.\n\n  allocateTargetId(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<TargetId> {\n    return this.retrieveMetadata(transaction).next(metadata => {\n      const targetIdGenerator = new TargetIdGenerator(metadata.highestTargetId);\n      metadata.highestTargetId = targetIdGenerator.next();\n      return this.saveMetadata(transaction, metadata).next(\n        () => metadata.highestTargetId\n      );\n    });\n  }\n\n  getLastRemoteSnapshotVersion(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<SnapshotVersion> {\n    return this.retrieveMetadata(transaction).next(metadata => {\n      return SnapshotVersion.fromTimestamp(\n        new Timestamp(\n          metadata.lastRemoteSnapshotVersion.seconds,\n          metadata.lastRemoteSnapshotVersion.nanoseconds\n        )\n      );\n    });\n  }\n\n  getHighestSequenceNumber(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<ListenSequenceNumber> {\n    return this.retrieveMetadata(transaction).next(\n      targetGlobal => targetGlobal.highestListenSequenceNumber\n    );\n  }\n\n  setTargetsMetadata(\n    transaction: PersistenceTransaction,\n    highestListenSequenceNumber: number,\n    lastRemoteSnapshotVersion?: SnapshotVersion\n  ): PersistencePromise<void> {\n    return this.retrieveMetadata(transaction).next(metadata => {\n      metadata.highestListenSequenceNumber = highestListenSequenceNumber;\n      if (lastRemoteSnapshotVersion) {\n        metadata.lastRemoteSnapshotVersion = lastRemoteSnapshotVersion.toTimestamp();\n      }\n      if (highestListenSequenceNumber > metadata.highestListenSequenceNumber) {\n        metadata.highestListenSequenceNumber = highestListenSequenceNumber;\n      }\n      return this.saveMetadata(transaction, metadata);\n    });\n  }\n\n  addTargetData(\n    transaction: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    return this.saveTargetData(transaction, targetData).next(() => {\n      return this.retrieveMetadata(transaction).next(metadata => {\n        metadata.targetCount += 1;\n        this.updateMetadataFromTargetData(targetData, metadata);\n        return this.saveMetadata(transaction, metadata);\n      });\n    });\n  }\n\n  updateTargetData(\n    transaction: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    return this.saveTargetData(transaction, targetData);\n  }\n\n  removeTargetData(\n    transaction: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    return this.removeMatchingKeysForTargetId(transaction, targetData.targetId)\n      .next(() => targetsStore(transaction).delete(targetData.targetId))\n      .next(() => this.retrieveMetadata(transaction))\n      .next(metadata => {\n        hardAssert(\n          metadata.targetCount > 0,\n          'Removing from an empty target cache'\n        );\n        metadata.targetCount -= 1;\n        return this.saveMetadata(transaction, metadata);\n      });\n  }\n\n  /**\n   * Drops any targets with sequence number less than or equal to the upper bound, excepting those\n   * present in `activeTargetIds`. Document associations for the removed targets are also removed.\n   * Returns the number of targets removed.\n   */\n  removeTargets(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber,\n    activeTargetIds: ActiveTargets\n  ): PersistencePromise<number> {\n    let count = 0;\n    const promises: Array<PersistencePromise<void>> = [];\n    return targetsStore(txn)\n      .iterate((key, value) => {\n        const targetData = this.serializer.fromDbTarget(value);\n        if (\n          targetData.sequenceNumber <= upperBound &&\n          activeTargetIds.get(targetData.targetId) === null\n        ) {\n          count++;\n          promises.push(this.removeTargetData(txn, targetData));\n        }\n      })\n      .next(() => PersistencePromise.waitFor(promises))\n      .next(() => count);\n  }\n\n  /**\n   * Call provided function with each `TargetData` that we have cached.\n   */\n  forEachTarget(\n    txn: PersistenceTransaction,\n    f: (q: TargetData) => void\n  ): PersistencePromise<void> {\n    return targetsStore(txn).iterate((key, value) => {\n      const targetData = this.serializer.fromDbTarget(value);\n      f(targetData);\n    });\n  }\n\n  private retrieveMetadata(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<DbTargetGlobal> {\n    return globalTargetStore(transaction)\n      .get(DbTargetGlobal.key)\n      .next(metadata => {\n        hardAssert(metadata !== null, 'Missing metadata row.');\n        return metadata;\n      });\n  }\n\n  private saveMetadata(\n    transaction: PersistenceTransaction,\n    metadata: DbTargetGlobal\n  ): PersistencePromise<void> {\n    return globalTargetStore(transaction).put(DbTargetGlobal.key, metadata);\n  }\n\n  private saveTargetData(\n    transaction: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    return targetsStore(transaction).put(\n      this.serializer.toDbTarget(targetData)\n    );\n  }\n\n  /**\n   * In-place updates the provided metadata to account for values in the given\n   * TargetData. Saving is done separately. Returns true if there were any\n   * changes to the metadata.\n   */\n  private updateMetadataFromTargetData(\n    targetData: TargetData,\n    metadata: DbTargetGlobal\n  ): boolean {\n    let updated = false;\n    if (targetData.targetId > metadata.highestTargetId) {\n      metadata.highestTargetId = targetData.targetId;\n      updated = true;\n    }\n\n    if (targetData.sequenceNumber > metadata.highestListenSequenceNumber) {\n      metadata.highestListenSequenceNumber = targetData.sequenceNumber;\n      updated = true;\n    }\n    return updated;\n  }\n\n  getTargetCount(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<number> {\n    return this.retrieveMetadata(transaction).next(\n      metadata => metadata.targetCount\n    );\n  }\n\n  getTargetData(\n    transaction: PersistenceTransaction,\n    target: Target\n  ): PersistencePromise<TargetData | null> {\n    // Iterating by the canonicalId may yield more than one result because\n    // canonicalId values are not required to be unique per target. This query\n    // depends on the queryTargets index to be efficient.\n    const canonicalId = target.canonicalId();\n    const range = IDBKeyRange.bound(\n      [canonicalId, Number.NEGATIVE_INFINITY],\n      [canonicalId, Number.POSITIVE_INFINITY]\n    );\n    let result: TargetData | null = null;\n    return targetsStore(transaction)\n      .iterate(\n        { range, index: DbTarget.queryTargetsIndexName },\n        (key, value, control) => {\n          const found = this.serializer.fromDbTarget(value);\n          // After finding a potential match, check that the target is\n          // actually equal to the requested target.\n          if (target.isEqual(found.target)) {\n            result = found;\n            control.done();\n          }\n        }\n      )\n      .next(() => result);\n  }\n\n  addMatchingKeys(\n    txn: PersistenceTransaction,\n    keys: DocumentKeySet,\n    targetId: TargetId\n  ): PersistencePromise<void> {\n    // PORTING NOTE: The reverse index (documentsTargets) is maintained by\n    // IndexedDb.\n    const promises: Array<PersistencePromise<void>> = [];\n    const store = documentTargetStore(txn);\n    keys.forEach(key => {\n      const path = encodeResourcePath(key.path);\n      promises.push(store.put(new DbTargetDocument(targetId, path)));\n      promises.push(this.referenceDelegate.addReference(txn, targetId, key));\n    });\n    return PersistencePromise.waitFor(promises);\n  }\n\n  removeMatchingKeys(\n    txn: PersistenceTransaction,\n    keys: DocumentKeySet,\n    targetId: TargetId\n  ): PersistencePromise<void> {\n    // PORTING NOTE: The reverse index (documentsTargets) is maintained by\n    // IndexedDb.\n    const store = documentTargetStore(txn);\n    return PersistencePromise.forEach(keys, (key: DocumentKey) => {\n      const path = encodeResourcePath(key.path);\n      return PersistencePromise.waitFor([\n        store.delete([targetId, path]),\n        this.referenceDelegate.removeReference(txn, targetId, key)\n      ]);\n    });\n  }\n\n  removeMatchingKeysForTargetId(\n    txn: PersistenceTransaction,\n    targetId: TargetId\n  ): PersistencePromise<void> {\n    const store = documentTargetStore(txn);\n    const range = IDBKeyRange.bound(\n      [targetId],\n      [targetId + 1],\n      /*lowerOpen=*/ false,\n      /*upperOpen=*/ true\n    );\n    return store.delete(range);\n  }\n\n  getMatchingKeysForTargetId(\n    txn: PersistenceTransaction,\n    targetId: TargetId\n  ): PersistencePromise<DocumentKeySet> {\n    const range = IDBKeyRange.bound(\n      [targetId],\n      [targetId + 1],\n      /*lowerOpen=*/ false,\n      /*upperOpen=*/ true\n    );\n    const store = documentTargetStore(txn);\n    let result = documentKeySet();\n\n    return store\n      .iterate({ range, keysOnly: true }, (key, _, control) => {\n        const path = decodeResourcePath(key[1]);\n        const docKey = new DocumentKey(path);\n        result = result.add(docKey);\n      })\n      .next(() => result);\n  }\n\n  containsKey(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<boolean> {\n    const path = encodeResourcePath(key.path);\n    const range = IDBKeyRange.bound(\n      [path],\n      [immediateSuccessor(path)],\n      /*lowerOpen=*/ false,\n      /*upperOpen=*/ true\n    );\n    let count = 0;\n    return documentTargetStore(txn!)\n      .iterate(\n        {\n          index: DbTargetDocument.documentTargetsIndex,\n          keysOnly: true,\n          range\n        },\n        ([targetId, path], _, control) => {\n          // Having a sentinel row for a document does not count as containing that document;\n          // For the target cache, containing the document means the document is part of some\n          // target.\n          if (targetId !== 0) {\n            count++;\n            control.done();\n          }\n        }\n      )\n      .next(() => count > 0);\n  }\n\n  /**\n   * Looks up a TargetData entry by target ID.\n   *\n   * @param targetId The target ID of the TargetData entry to look up.\n   * @return The cached TargetData entry, or null if the cache has no entry for\n   * the target.\n   */\n  // PORTING NOTE: Multi-tab only.\n  getTargetDataForTarget(\n    transaction: PersistenceTransaction,\n    targetId: TargetId\n  ): PersistencePromise<TargetData | null> {\n    return targetsStore(transaction)\n      .get(targetId)\n      .next(found => {\n        if (found) {\n          return this.serializer.fromDbTarget(found);\n        } else {\n          return null;\n        }\n      });\n  }\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the queries object store.\n */\nfunction targetsStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbTargetKey, DbTarget> {\n  return IndexedDbPersistence.getStore<DbTargetKey, DbTarget>(\n    txn,\n    DbTarget.store\n  );\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the target globals object store.\n */\nfunction globalTargetStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbTargetGlobalKey, DbTargetGlobal> {\n  return IndexedDbPersistence.getStore<DbTargetGlobalKey, DbTargetGlobal>(\n    txn,\n    DbTargetGlobal.store\n  );\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the document target object store.\n */\nexport function documentTargetStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbTargetDocumentKey, DbTargetDocument> {\n  return IndexedDbPersistence.getStore<DbTargetDocumentKey, DbTargetDocument>(\n    txn,\n    DbTargetDocument.store\n  );\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Timestamp } from '../api/timestamp';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport {\n  Document,\n  MaybeDocument,\n  NoDocument,\n  UnknownDocument\n} from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { MutationBatch } from '../model/mutation_batch';\nimport * as api from '../protos/firestore_proto_api';\nimport { JsonProtoSerializer } from '../remote/serializer';\nimport { debugAssert, fail } from '../util/assert';\nimport { ByteString } from '../util/byte_string';\nimport { Target } from '../core/target';\nimport {\n  DbMutationBatch,\n  DbNoDocument,\n  DbQuery,\n  DbRemoteDocument,\n  DbTarget,\n  DbTimestamp,\n  DbTimestampKey,\n  DbUnknownDocument\n} from './indexeddb_schema';\nimport { TargetData, TargetPurpose } from './target_data';\n\n/** Serializer for values stored in the LocalStore. */\nexport class LocalSerializer {\n  constructor(private remoteSerializer: JsonProtoSerializer) {}\n\n  /** Decodes a remote document from storage locally to a Document. */\n  fromDbRemoteDocument(remoteDoc: DbRemoteDocument): MaybeDocument {\n    if (remoteDoc.document) {\n      return this.remoteSerializer.fromDocument(\n        remoteDoc.document,\n        !!remoteDoc.hasCommittedMutations\n      );\n    } else if (remoteDoc.noDocument) {\n      const key = DocumentKey.fromSegments(remoteDoc.noDocument.path);\n      const version = this.fromDbTimestamp(remoteDoc.noDocument.readTime);\n      return new NoDocument(key, version, {\n        hasCommittedMutations: !!remoteDoc.hasCommittedMutations\n      });\n    } else if (remoteDoc.unknownDocument) {\n      const key = DocumentKey.fromSegments(remoteDoc.unknownDocument.path);\n      const version = this.fromDbTimestamp(remoteDoc.unknownDocument.version);\n      return new UnknownDocument(key, version);\n    } else {\n      return fail('Unexpected DbRemoteDocument');\n    }\n  }\n\n  /** Encodes a document for storage locally. */\n  toDbRemoteDocument(\n    maybeDoc: MaybeDocument,\n    readTime: SnapshotVersion\n  ): DbRemoteDocument {\n    const dbReadTime = this.toDbTimestampKey(readTime);\n    const parentPath = maybeDoc.key.path.popLast().toArray();\n    if (maybeDoc instanceof Document) {\n      const doc = this.remoteSerializer.toDocument(maybeDoc);\n      const hasCommittedMutations = maybeDoc.hasCommittedMutations;\n      return new DbRemoteDocument(\n        /* unknownDocument= */ null,\n        /* noDocument= */ null,\n        doc,\n        hasCommittedMutations,\n        dbReadTime,\n        parentPath\n      );\n    } else if (maybeDoc instanceof NoDocument) {\n      const path = maybeDoc.key.path.toArray();\n      const readTime = this.toDbTimestamp(maybeDoc.version);\n      const hasCommittedMutations = maybeDoc.hasCommittedMutations;\n      return new DbRemoteDocument(\n        /* unknownDocument= */ null,\n        new DbNoDocument(path, readTime),\n        /* document= */ null,\n        hasCommittedMutations,\n        dbReadTime,\n        parentPath\n      );\n    } else if (maybeDoc instanceof UnknownDocument) {\n      const path = maybeDoc.key.path.toArray();\n      const readTime = this.toDbTimestamp(maybeDoc.version);\n      return new DbRemoteDocument(\n        new DbUnknownDocument(path, readTime),\n        /* noDocument= */ null,\n        /* document= */ null,\n        /* hasCommittedMutations= */ true,\n        dbReadTime,\n        parentPath\n      );\n    } else {\n      return fail('Unexpected MaybeDocument');\n    }\n  }\n\n  toDbTimestampKey(snapshotVersion: SnapshotVersion): DbTimestampKey {\n    const timestamp = snapshotVersion.toTimestamp();\n    return [timestamp.seconds, timestamp.nanoseconds];\n  }\n\n  fromDbTimestampKey(dbTimestampKey: DbTimestampKey): SnapshotVersion {\n    const timestamp = new Timestamp(dbTimestampKey[0], dbTimestampKey[1]);\n    return SnapshotVersion.fromTimestamp(timestamp);\n  }\n\n  private toDbTimestamp(snapshotVersion: SnapshotVersion): DbTimestamp {\n    const timestamp = snapshotVersion.toTimestamp();\n    return new DbTimestamp(timestamp.seconds, timestamp.nanoseconds);\n  }\n\n  private fromDbTimestamp(dbTimestamp: DbTimestamp): SnapshotVersion {\n    const timestamp = new Timestamp(\n      dbTimestamp.seconds,\n      dbTimestamp.nanoseconds\n    );\n    return SnapshotVersion.fromTimestamp(timestamp);\n  }\n\n  /** Encodes a batch of mutations into a DbMutationBatch for local storage. */\n  toDbMutationBatch(userId: string, batch: MutationBatch): DbMutationBatch {\n    const serializedBaseMutations = batch.baseMutations.map(m =>\n      this.remoteSerializer.toMutation(m)\n    );\n    const serializedMutations = batch.mutations.map(m =>\n      this.remoteSerializer.toMutation(m)\n    );\n    return new DbMutationBatch(\n      userId,\n      batch.batchId,\n      batch.localWriteTime.toMillis(),\n      serializedBaseMutations,\n      serializedMutations\n    );\n  }\n\n  /** Decodes a DbMutationBatch into a MutationBatch */\n  fromDbMutationBatch(dbBatch: DbMutationBatch): MutationBatch {\n    const baseMutations = (dbBatch.baseMutations || []).map(m =>\n      this.remoteSerializer.fromMutation(m)\n    );\n    const mutations = dbBatch.mutations.map(m =>\n      this.remoteSerializer.fromMutation(m)\n    );\n    const timestamp = Timestamp.fromMillis(dbBatch.localWriteTimeMs);\n    return new MutationBatch(\n      dbBatch.batchId,\n      timestamp,\n      baseMutations,\n      mutations\n    );\n  }\n\n  /** Decodes a DbTarget into TargetData */\n  fromDbTarget(dbTarget: DbTarget): TargetData {\n    const version = this.fromDbTimestamp(dbTarget.readTime);\n    const lastLimboFreeSnapshotVersion =\n      dbTarget.lastLimboFreeSnapshotVersion !== undefined\n        ? this.fromDbTimestamp(dbTarget.lastLimboFreeSnapshotVersion)\n        : SnapshotVersion.min();\n\n    let target: Target;\n    if (isDocumentQuery(dbTarget.query)) {\n      target = this.remoteSerializer.fromDocumentsTarget(dbTarget.query);\n    } else {\n      target = this.remoteSerializer.fromQueryTarget(dbTarget.query);\n    }\n    return new TargetData(\n      target,\n      dbTarget.targetId,\n      TargetPurpose.Listen,\n      dbTarget.lastListenSequenceNumber,\n      version,\n      lastLimboFreeSnapshotVersion,\n      ByteString.fromBase64String(dbTarget.resumeToken)\n    );\n  }\n\n  /** Encodes TargetData into a DbTarget for storage locally. */\n  toDbTarget(targetData: TargetData): DbTarget {\n    debugAssert(\n      TargetPurpose.Listen === targetData.purpose,\n      'Only queries with purpose ' +\n        TargetPurpose.Listen +\n        ' may be stored, got ' +\n        targetData.purpose\n    );\n    const dbTimestamp = this.toDbTimestamp(targetData.snapshotVersion);\n    const dbLastLimboFreeTimestamp = this.toDbTimestamp(\n      targetData.lastLimboFreeSnapshotVersion\n    );\n    let queryProto: DbQuery;\n    if (targetData.target.isDocumentQuery()) {\n      queryProto = this.remoteSerializer.toDocumentsTarget(targetData.target);\n    } else {\n      queryProto = this.remoteSerializer.toQueryTarget(targetData.target);\n    }\n\n    // We can't store the resumeToken as a ByteString in IndexedDb, so we\n    // convert it to a base64 string for storage.\n    const resumeToken = targetData.resumeToken.toBase64();\n\n    // lastListenSequenceNumber is always 0 until we do real GC.\n    return new DbTarget(\n      targetData.targetId,\n      targetData.target.canonicalId(),\n      dbTimestamp,\n      resumeToken,\n      targetData.sequenceNumber,\n      dbLastLimboFreeTimestamp,\n      queryProto\n    );\n  }\n}\n\n/**\n * A helper function for figuring out what kind of query has been stored.\n */\nfunction isDocumentQuery(dbQuery: DbQuery): dbQuery is api.DocumentsTarget {\n  return (dbQuery as api.DocumentsTarget).documents !== undefined;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { User } from '../auth/user';\nimport { DatabaseInfo } from '../core/database_info';\nimport { ListenSequence, SequenceNumberSyncer } from '../core/listen_sequence';\nimport { ListenSequenceNumber, TargetId } from '../core/types';\nimport { DocumentKey } from '../model/document_key';\nimport { Platform } from '../platform/platform';\nimport { JsonProtoSerializer } from '../remote/serializer';\nimport { debugAssert, fail } from '../util/assert';\nimport { AsyncQueue, DelayedOperation, TimerId } from '../util/async_queue';\nimport { Code, FirestoreError } from '../util/error';\nimport { logDebug, logError } from '../util/log';\nimport {\n  decodeResourcePath,\n  EncodedResourcePath,\n  encodeResourcePath\n} from './encoded_resource_path';\nimport { IndexedDbIndexManager } from './indexeddb_index_manager';\nimport {\n  IndexedDbMutationQueue,\n  mutationQueuesContainKey\n} from './indexeddb_mutation_queue';\nimport { IndexedDbRemoteDocumentCache } from './indexeddb_remote_document_cache';\nimport {\n  ALL_STORES,\n  DbClientMetadata,\n  DbClientMetadataKey,\n  DbPrimaryClient,\n  DbPrimaryClientKey,\n  DbTargetDocument,\n  SCHEMA_VERSION,\n  SchemaConverter\n} from './indexeddb_schema';\nimport {\n  documentTargetStore,\n  IndexedDbTargetCache\n} from './indexeddb_target_cache';\nimport { LocalSerializer } from './local_serializer';\nimport {\n  ActiveTargets,\n  LruDelegate,\n  LruGarbageCollector,\n  LruParams\n} from './lru_garbage_collector';\nimport {\n  Persistence,\n  PersistenceTransaction,\n  PersistenceTransactionMode,\n  PRIMARY_LEASE_LOST_ERROR_MSG,\n  PrimaryStateListener,\n  ReferenceDelegate\n} from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { ClientId } from './shared_client_state';\nimport { TargetData } from './target_data';\nimport {\n  isIndexedDbTransactionError,\n  SimpleDb,\n  SimpleDbStore,\n  SimpleDbTransaction\n} from './simple_db';\n\nconst LOG_TAG = 'IndexedDbPersistence';\n\n/**\n * Oldest acceptable age in milliseconds for client metadata before the client\n * is considered inactive and its associated data is garbage collected.\n */\nconst MAX_CLIENT_AGE_MS = 30 * 60 * 1000; // 30 minutes\n\n/**\n * Oldest acceptable metadata age for clients that may participate in the\n * primary lease election. Clients that have not updated their client metadata\n * within 5 seconds are not eligible to receive a primary lease.\n */\nconst MAX_PRIMARY_ELIGIBLE_AGE_MS = 5000;\n\n/**\n * The interval at which clients will update their metadata, including\n * refreshing their primary lease if held or potentially trying to acquire it if\n * not held.\n *\n * Primary clients may opportunistically refresh their metadata earlier\n * if they're already performing an IndexedDB operation.\n */\nconst CLIENT_METADATA_REFRESH_INTERVAL_MS = 4000;\n/** User-facing error when the primary lease is required but not available. */\nconst PRIMARY_LEASE_EXCLUSIVE_ERROR_MSG =\n  'Failed to obtain exclusive access to the persistence layer. ' +\n  'To allow shared access, make sure to invoke ' +\n  '`enablePersistence()` with `synchronizeTabs:true` in all tabs.';\nconst UNSUPPORTED_PLATFORM_ERROR_MSG =\n  'This platform is either missing' +\n  ' IndexedDB or is known to have an incomplete implementation. Offline' +\n  ' persistence has been disabled.';\n\n// The format of the LocalStorage key that stores zombied client is:\n//     firestore_zombie_<persistence_prefix>_<instance_key>\nconst ZOMBIED_CLIENTS_KEY_PREFIX = 'firestore_zombie';\n\nexport class IndexedDbTransaction extends PersistenceTransaction {\n  constructor(\n    readonly simpleDbTransaction: SimpleDbTransaction,\n    readonly currentSequenceNumber: ListenSequenceNumber\n  ) {\n    super();\n  }\n}\n\n/**\n * An IndexedDB-backed instance of Persistence. Data is stored persistently\n * across sessions.\n *\n * On Web only, the Firestore SDKs support shared access to its persistence\n * layer. This allows multiple browser tabs to read and write to IndexedDb and\n * to synchronize state even without network connectivity. Shared access is\n * currently optional and not enabled unless all clients invoke\n * `enablePersistence()` with `{synchronizeTabs:true}`.\n *\n * In multi-tab mode, if multiple clients are active at the same time, the SDK\n * will designate one client as the “primary client”. An effort is made to pick\n * a visible, network-connected and active client, and this client is\n * responsible for letting other clients know about its presence. The primary\n * client writes a unique client-generated identifier (the client ID) to\n * IndexedDb’s “owner” store every 4 seconds. If the primary client fails to\n * update this entry, another client can acquire the lease and take over as\n * primary.\n *\n * Some persistence operations in the SDK are designated as primary-client only\n * operations. This includes the acknowledgment of mutations and all updates of\n * remote documents. The effects of these operations are written to persistence\n * and then broadcast to other tabs via LocalStorage (see\n * `WebStorageSharedClientState`), which then refresh their state from\n * persistence.\n *\n * Similarly, the primary client listens to notifications sent by secondary\n * clients to discover persistence changes written by secondary clients, such as\n * the addition of new mutations and query targets.\n *\n * If multi-tab is not enabled and another tab already obtained the primary\n * lease, IndexedDbPersistence enters a failed state and all subsequent\n * operations will automatically fail.\n *\n * Additionally, there is an optimization so that when a tab is closed, the\n * primary lease is released immediately (this is especially important to make\n * sure that a refreshed tab is able to immediately re-acquire the primary\n * lease). Unfortunately, IndexedDB cannot be reliably used in window.unload\n * since it is an asynchronous API. So in addition to attempting to give up the\n * lease, the leaseholder writes its client ID to a \"zombiedClient\" entry in\n * LocalStorage which acts as an indicator that another tab should go ahead and\n * take the primary lease immediately regardless of the current lease timestamp.\n *\n * TODO(b/114226234): Remove `synchronizeTabs` section when multi-tab is no\n * longer optional.\n */\nexport class IndexedDbPersistence implements Persistence {\n  static getStore<Key extends IDBValidKey, Value>(\n    txn: PersistenceTransaction,\n    store: string\n  ): SimpleDbStore<Key, Value> {\n    if (txn instanceof IndexedDbTransaction) {\n      return SimpleDb.getStore<Key, Value>(txn.simpleDbTransaction, store);\n    } else {\n      throw fail(\n        'IndexedDbPersistence must use instances of IndexedDbTransaction'\n      );\n    }\n  }\n\n  /**\n   * The name of the main (and currently only) IndexedDB database. this name is\n   * appended to the prefix provided to the IndexedDbPersistence constructor.\n   */\n  static MAIN_DATABASE = 'main';\n\n  private readonly document: Document | null;\n  private readonly window: Window;\n\n  // Technically `simpleDb` should be `| undefined` because it is\n  // initialized asynchronously by start(), but that would be more misleading\n  // than useful.\n  private simpleDb!: SimpleDb;\n\n  private listenSequence: ListenSequence | null = null;\n\n  private _started = false;\n  private isPrimary = false;\n  private networkEnabled = true;\n  private dbName: string;\n\n  /** Our window.unload handler, if registered. */\n  private windowUnloadHandler: (() => void) | null = null;\n  private inForeground = false;\n\n  private serializer: LocalSerializer;\n\n  /** Our 'visibilitychange' listener if registered. */\n  private documentVisibilityHandler: ((e?: Event) => void) | null = null;\n\n  /** The client metadata refresh task. */\n  private clientMetadataRefresher: DelayedOperation<void> | null = null;\n\n  /** The last time we garbage collected the client metadata object store. */\n  private lastGarbageCollectionTime = Number.NEGATIVE_INFINITY;\n\n  /** A listener to notify on primary state changes. */\n  private primaryStateListener: PrimaryStateListener = _ => Promise.resolve();\n\n  private readonly targetCache: IndexedDbTargetCache;\n  private readonly indexManager: IndexedDbIndexManager;\n  private readonly remoteDocumentCache: IndexedDbRemoteDocumentCache;\n  private readonly webStorage: Storage;\n  readonly referenceDelegate: IndexedDbLruDelegate;\n\n  constructor(\n    private readonly allowTabSynchronization: boolean,\n    private readonly persistenceKey: string,\n    private readonly clientId: ClientId,\n    platform: Platform,\n    lruParams: LruParams,\n    private readonly queue: AsyncQueue,\n    serializer: JsonProtoSerializer,\n    private readonly sequenceNumberSyncer: SequenceNumberSyncer\n  ) {\n    if (!IndexedDbPersistence.isAvailable()) {\n      throw new FirestoreError(\n        Code.UNIMPLEMENTED,\n        UNSUPPORTED_PLATFORM_ERROR_MSG\n      );\n    }\n\n    this.referenceDelegate = new IndexedDbLruDelegate(this, lruParams);\n    this.dbName = persistenceKey + IndexedDbPersistence.MAIN_DATABASE;\n    this.serializer = new LocalSerializer(serializer);\n    this.document = platform.document;\n    this.targetCache = new IndexedDbTargetCache(\n      this.referenceDelegate,\n      this.serializer\n    );\n    this.indexManager = new IndexedDbIndexManager();\n    this.remoteDocumentCache = new IndexedDbRemoteDocumentCache(\n      this.serializer,\n      this.indexManager\n    );\n    if (platform.window && platform.window.localStorage) {\n      this.window = platform.window;\n      this.webStorage = this.window.localStorage;\n    } else {\n      throw new FirestoreError(\n        Code.UNIMPLEMENTED,\n        'IndexedDB persistence is only available on platforms that support LocalStorage.'\n      );\n    }\n  }\n\n  /**\n   * Attempt to start IndexedDb persistence.\n   *\n   * @return {Promise<void>} Whether persistence was enabled.\n   */\n  start(): Promise<void> {\n    debugAssert(!this.started, 'IndexedDbPersistence double-started!');\n    debugAssert(this.window !== null, \"Expected 'window' to be defined\");\n\n    return SimpleDb.openOrCreate(\n      this.dbName,\n      SCHEMA_VERSION,\n      new SchemaConverter(this.serializer)\n    )\n      .then(db => {\n        this.simpleDb = db;\n        // NOTE: This is expected to fail sometimes (in the case of another tab already\n        // having the persistence lock), so it's the first thing we should do.\n        return this.updateClientMetadataAndTryBecomePrimary();\n      })\n      .then(() => {\n        if (!this.isPrimary && !this.allowTabSynchronization) {\n          // Fail `start()` if `synchronizeTabs` is disabled and we cannot\n          // obtain the primary lease.\n          throw new FirestoreError(\n            Code.FAILED_PRECONDITION,\n            PRIMARY_LEASE_EXCLUSIVE_ERROR_MSG\n          );\n        }\n        this.attachVisibilityHandler();\n        this.attachWindowUnloadHook();\n\n        this.scheduleClientMetadataAndPrimaryLeaseRefreshes();\n\n        return this.runTransaction(\n          'getHighestListenSequenceNumber',\n          'readonly',\n          txn => this.targetCache.getHighestSequenceNumber(txn)\n        );\n      })\n      .then(highestListenSequenceNumber => {\n        this.listenSequence = new ListenSequence(\n          highestListenSequenceNumber,\n          this.sequenceNumberSyncer\n        );\n      })\n      .then(() => {\n        this._started = true;\n      })\n      .catch(reason => {\n        this.simpleDb && this.simpleDb.close();\n        return Promise.reject(reason);\n      });\n  }\n\n  /**\n   * Registers a listener that gets called when the primary state of the\n   * instance changes. Upon registering, this listener is invoked immediately\n   * with the current primary state.\n   *\n   * PORTING NOTE: This is only used for Web multi-tab.\n   */\n  setPrimaryStateListener(\n    primaryStateListener: PrimaryStateListener\n  ): Promise<void> {\n    this.primaryStateListener = async primaryState => {\n      if (this.started) {\n        return primaryStateListener(primaryState);\n      }\n    };\n    return primaryStateListener(this.isPrimary);\n  }\n\n  /**\n   * Registers a listener that gets called when the database receives a\n   * version change event indicating that it has deleted.\n   *\n   * PORTING NOTE: This is only used for Web multi-tab.\n   */\n  setDatabaseDeletedListener(\n    databaseDeletedListener: () => Promise<void>\n  ): void {\n    this.simpleDb.setVersionChangeListener(async event => {\n      // Check if an attempt is made to delete IndexedDB.\n      if (event.newVersion === null) {\n        await databaseDeletedListener();\n      }\n    });\n  }\n\n  /**\n   * Adjusts the current network state in the client's metadata, potentially\n   * affecting the primary lease.\n   *\n   * PORTING NOTE: This is only used for Web multi-tab.\n   */\n  setNetworkEnabled(networkEnabled: boolean): void {\n    if (this.networkEnabled !== networkEnabled) {\n      this.networkEnabled = networkEnabled;\n      // Schedule a primary lease refresh for immediate execution. The eventual\n      // lease update will be propagated via `primaryStateListener`.\n      this.queue.enqueueAndForget(async () => {\n        if (this.started) {\n          await this.updateClientMetadataAndTryBecomePrimary();\n        }\n      });\n    }\n  }\n\n  /**\n   * Updates the client metadata in IndexedDb and attempts to either obtain or\n   * extend the primary lease for the local client. Asynchronously notifies the\n   * primary state listener if the client either newly obtained or released its\n   * primary lease.\n   */\n  private updateClientMetadataAndTryBecomePrimary(): Promise<void> {\n    return this.runTransaction(\n      'updateClientMetadataAndTryBecomePrimary',\n      'readwrite',\n      txn => {\n        const metadataStore = clientMetadataStore(txn);\n        return metadataStore\n          .put(\n            new DbClientMetadata(\n              this.clientId,\n              Date.now(),\n              this.networkEnabled,\n              this.inForeground\n            )\n          )\n          .next(() => {\n            if (this.isPrimary) {\n              return this.verifyPrimaryLease(txn).next(success => {\n                if (!success) {\n                  this.isPrimary = false;\n                  this.queue.enqueueAndForget(() =>\n                    this.primaryStateListener(false)\n                  );\n                }\n              });\n            }\n          })\n          .next(() => this.canActAsPrimary(txn))\n          .next(canActAsPrimary => {\n            if (this.isPrimary && !canActAsPrimary) {\n              return this.releasePrimaryLeaseIfHeld(txn).next(() => false);\n            } else if (canActAsPrimary) {\n              return this.acquireOrExtendPrimaryLease(txn).next(() => true);\n            } else {\n              return /* canActAsPrimary= */ false;\n            }\n          });\n      }\n    )\n      .catch(e => {\n        if (!this.allowTabSynchronization) {\n          if (isIndexedDbTransactionError(e)) {\n            logDebug(LOG_TAG, 'Failed to extend owner lease: ', e);\n            // Proceed with the existing state. Any subsequent access to\n            // IndexedDB will verify the lease.\n            return this.isPrimary;\n          } else {\n            throw e;\n          }\n        }\n\n        logDebug(\n          LOG_TAG,\n          'Releasing owner lease after error during lease refresh',\n          e\n        );\n        return /* isPrimary= */ false;\n      })\n      .then(isPrimary => {\n        if (this.isPrimary !== isPrimary) {\n          this.queue.enqueueAndForget(() =>\n            this.primaryStateListener(isPrimary)\n          );\n        }\n        this.isPrimary = isPrimary;\n      });\n  }\n\n  private verifyPrimaryLease(\n    txn: PersistenceTransaction\n  ): PersistencePromise<boolean> {\n    const store = primaryClientStore(txn);\n    return store.get(DbPrimaryClient.key).next(primaryClient => {\n      return PersistencePromise.resolve(this.isLocalClient(primaryClient));\n    });\n  }\n\n  private removeClientMetadata(\n    txn: PersistenceTransaction\n  ): PersistencePromise<void> {\n    const metadataStore = clientMetadataStore(txn);\n    return metadataStore.delete(this.clientId);\n  }\n\n  /**\n   * If the garbage collection threshold has passed, prunes the\n   * RemoteDocumentChanges and the ClientMetadata store based on the last update\n   * time of all clients.\n   */\n  private async maybeGarbageCollectMultiClientState(): Promise<void> {\n    if (\n      this.isPrimary &&\n      !this.isWithinAge(this.lastGarbageCollectionTime, MAX_CLIENT_AGE_MS)\n    ) {\n      this.lastGarbageCollectionTime = Date.now();\n\n      const inactiveClients = await this.runTransaction(\n        'maybeGarbageCollectMultiClientState',\n        'readwrite-primary',\n        txn => {\n          const metadataStore = IndexedDbPersistence.getStore<\n            DbClientMetadataKey,\n            DbClientMetadata\n          >(txn, DbClientMetadata.store);\n\n          return metadataStore.loadAll().next(existingClients => {\n            const active = this.filterActiveClients(\n              existingClients,\n              MAX_CLIENT_AGE_MS\n            );\n            const inactive = existingClients.filter(\n              client => active.indexOf(client) === -1\n            );\n\n            // Delete metadata for clients that are no longer considered active.\n            return PersistencePromise.forEach(\n              inactive,\n              (inactiveClient: DbClientMetadata) =>\n                metadataStore.delete(inactiveClient.clientId)\n            ).next(() => inactive);\n          });\n        }\n      ).catch(() => {\n        // Ignore primary lease violations or any other type of error. The next\n        // primary will run `maybeGarbageCollectMultiClientState()` again.\n        // We don't use `ignoreIfPrimaryLeaseLoss()` since we don't want to depend\n        // on LocalStore.\n        return [];\n      });\n\n      // Delete potential leftover entries that may continue to mark the\n      // inactive clients as zombied in LocalStorage.\n      // Ideally we'd delete the IndexedDb and LocalStorage zombie entries for\n      // the client atomically, but we can't. So we opt to delete the IndexedDb\n      // entries first to avoid potentially reviving a zombied client.\n      inactiveClients.forEach(inactiveClient => {\n        this.window.localStorage.removeItem(\n          this.zombiedClientLocalStorageKey(inactiveClient.clientId)\n        );\n      });\n    }\n  }\n\n  /**\n   * Schedules a recurring timer to update the client metadata and to either\n   * extend or acquire the primary lease if the client is eligible.\n   */\n  private scheduleClientMetadataAndPrimaryLeaseRefreshes(): void {\n    this.clientMetadataRefresher = this.queue.enqueueAfterDelay(\n      TimerId.ClientMetadataRefresh,\n      CLIENT_METADATA_REFRESH_INTERVAL_MS,\n      () => {\n        return this.updateClientMetadataAndTryBecomePrimary()\n          .then(() => this.maybeGarbageCollectMultiClientState())\n          .then(() => this.scheduleClientMetadataAndPrimaryLeaseRefreshes());\n      }\n    );\n  }\n\n  /** Checks whether `client` is the local client. */\n  private isLocalClient(client: DbPrimaryClient | null): boolean {\n    return client ? client.ownerId === this.clientId : false;\n  }\n\n  /**\n   * Evaluate the state of all active clients and determine whether the local\n   * client is or can act as the holder of the primary lease. Returns whether\n   * the client is eligible for the lease, but does not actually acquire it.\n   * May return 'false' even if there is no active leaseholder and another\n   * (foreground) client should become leaseholder instead.\n   */\n  private canActAsPrimary(\n    txn: PersistenceTransaction\n  ): PersistencePromise<boolean> {\n    const store = primaryClientStore(txn);\n    return store\n      .get(DbPrimaryClient.key)\n      .next(currentPrimary => {\n        const currentLeaseIsValid =\n          currentPrimary !== null &&\n          this.isWithinAge(\n            currentPrimary.leaseTimestampMs,\n            MAX_PRIMARY_ELIGIBLE_AGE_MS\n          ) &&\n          !this.isClientZombied(currentPrimary.ownerId);\n\n        // A client is eligible for the primary lease if:\n        // - its network is enabled and the client's tab is in the foreground.\n        // - its network is enabled and no other client's tab is in the\n        //   foreground.\n        // - every clients network is disabled and the client's tab is in the\n        //   foreground.\n        // - every clients network is disabled and no other client's tab is in\n        //   the foreground.\n        if (currentLeaseIsValid) {\n          if (this.isLocalClient(currentPrimary) && this.networkEnabled) {\n            return true;\n          }\n\n          if (!this.isLocalClient(currentPrimary)) {\n            if (!currentPrimary!.allowTabSynchronization) {\n              // Fail the `canActAsPrimary` check if the current leaseholder has\n              // not opted into multi-tab synchronization. If this happens at\n              // client startup, we reject the Promise returned by\n              // `enablePersistence()` and the user can continue to use Firestore\n              // with in-memory persistence.\n              // If this fails during a lease refresh, we will instead block the\n              // AsyncQueue from executing further operations. Note that this is\n              // acceptable since mixing & matching different `synchronizeTabs`\n              // settings is not supported.\n              //\n              // TODO(b/114226234): Remove this check when `synchronizeTabs` can\n              // no longer be turned off.\n              throw new FirestoreError(\n                Code.FAILED_PRECONDITION,\n                PRIMARY_LEASE_EXCLUSIVE_ERROR_MSG\n              );\n            }\n\n            return false;\n          }\n        }\n\n        if (this.networkEnabled && this.inForeground) {\n          return true;\n        }\n\n        return clientMetadataStore(txn)\n          .loadAll()\n          .next(existingClients => {\n            // Process all existing clients and determine whether at least one of\n            // them is better suited to obtain the primary lease.\n            const preferredCandidate = this.filterActiveClients(\n              existingClients,\n              MAX_PRIMARY_ELIGIBLE_AGE_MS\n            ).find(otherClient => {\n              if (this.clientId !== otherClient.clientId) {\n                const otherClientHasBetterNetworkState =\n                  !this.networkEnabled && otherClient.networkEnabled;\n                const otherClientHasBetterVisibility =\n                  !this.inForeground && otherClient.inForeground;\n                const otherClientHasSameNetworkState =\n                  this.networkEnabled === otherClient.networkEnabled;\n                if (\n                  otherClientHasBetterNetworkState ||\n                  (otherClientHasBetterVisibility &&\n                    otherClientHasSameNetworkState)\n                ) {\n                  return true;\n                }\n              }\n              return false;\n            });\n            return preferredCandidate === undefined;\n          });\n      })\n      .next(canActAsPrimary => {\n        if (this.isPrimary !== canActAsPrimary) {\n          logDebug(\n            LOG_TAG,\n            `Client ${\n              canActAsPrimary ? 'is' : 'is not'\n            } eligible for a primary lease.`\n          );\n        }\n        return canActAsPrimary;\n      });\n  }\n\n  async shutdown(): Promise<void> {\n    // The shutdown() operations are idempotent and can be called even when\n    // start() aborted (e.g. because it couldn't acquire the persistence lease).\n    this._started = false;\n\n    this.markClientZombied();\n    if (this.clientMetadataRefresher) {\n      this.clientMetadataRefresher.cancel();\n      this.clientMetadataRefresher = null;\n    }\n    this.detachVisibilityHandler();\n    this.detachWindowUnloadHook();\n    await this.runTransaction('shutdown', 'readwrite', txn => {\n      return this.releasePrimaryLeaseIfHeld(txn).next(() =>\n        this.removeClientMetadata(txn)\n      );\n    }).catch(e => {\n      logDebug(LOG_TAG, 'Proceeding with shutdown despite failure: ', e);\n    });\n    this.simpleDb.close();\n\n    // Remove the entry marking the client as zombied from LocalStorage since\n    // we successfully deleted its metadata from IndexedDb.\n    this.removeClientZombiedEntry();\n  }\n\n  /**\n   * Returns clients that are not zombied and have an updateTime within the\n   * provided threshold.\n   */\n  private filterActiveClients(\n    clients: DbClientMetadata[],\n    activityThresholdMs: number\n  ): DbClientMetadata[] {\n    return clients.filter(\n      client =>\n        this.isWithinAge(client.updateTimeMs, activityThresholdMs) &&\n        !this.isClientZombied(client.clientId)\n    );\n  }\n\n  /**\n   * Returns the IDs of the clients that are currently active. If multi-tab\n   * is not supported, returns an array that only contains the local client's\n   * ID.\n   *\n   * PORTING NOTE: This is only used for Web multi-tab.\n   */\n  getActiveClients(): Promise<ClientId[]> {\n    return this.runTransaction('getActiveClients', 'readonly', txn => {\n      return clientMetadataStore(txn)\n        .loadAll()\n        .next(clients =>\n          this.filterActiveClients(clients, MAX_CLIENT_AGE_MS).map(\n            clientMetadata => clientMetadata.clientId\n          )\n        );\n    });\n  }\n\n  static async clearPersistence(persistenceKey: string): Promise<void> {\n    if (!IndexedDbPersistence.isAvailable()) {\n      return Promise.resolve();\n    }\n    const dbName = persistenceKey + IndexedDbPersistence.MAIN_DATABASE;\n    await SimpleDb.delete(dbName);\n  }\n\n  get started(): boolean {\n    return this._started;\n  }\n\n  getMutationQueue(user: User): IndexedDbMutationQueue {\n    debugAssert(\n      this.started,\n      'Cannot initialize MutationQueue before persistence is started.'\n    );\n    return IndexedDbMutationQueue.forUser(\n      user,\n      this.serializer,\n      this.indexManager,\n      this.referenceDelegate\n    );\n  }\n\n  getTargetCache(): IndexedDbTargetCache {\n    debugAssert(\n      this.started,\n      'Cannot initialize TargetCache before persistence is started.'\n    );\n    return this.targetCache;\n  }\n\n  getRemoteDocumentCache(): IndexedDbRemoteDocumentCache {\n    debugAssert(\n      this.started,\n      'Cannot initialize RemoteDocumentCache before persistence is started.'\n    );\n    return this.remoteDocumentCache;\n  }\n\n  getIndexManager(): IndexedDbIndexManager {\n    debugAssert(\n      this.started,\n      'Cannot initialize IndexManager before persistence is started.'\n    );\n    return this.indexManager;\n  }\n\n  runTransaction<T>(\n    action: string,\n    mode: PersistenceTransactionMode,\n    transactionOperation: (\n      transaction: PersistenceTransaction\n    ) => PersistencePromise<T>\n  ): Promise<T> {\n    logDebug(LOG_TAG, 'Starting transaction:', action);\n\n    const simpleDbMode = mode === 'readonly' ? 'readonly' : 'readwrite';\n\n    let persistenceTransaction: PersistenceTransaction;\n\n    // Do all transactions as readwrite against all object stores, since we\n    // are the only reader/writer.\n    return this.simpleDb\n      .runTransaction(simpleDbMode, ALL_STORES, simpleDbTxn => {\n        persistenceTransaction = new IndexedDbTransaction(\n          simpleDbTxn,\n          this.listenSequence\n            ? this.listenSequence.next()\n            : ListenSequence.INVALID\n        );\n\n        if (mode === 'readwrite-primary') {\n          // While we merely verify that we have (or can acquire) the lease\n          // immediately, we wait to extend the primary lease until after\n          // executing transactionOperation(). This ensures that even if the\n          // transactionOperation takes a long time, we'll use a recent\n          // leaseTimestampMs in the extended (or newly acquired) lease.\n          return this.verifyPrimaryLease(persistenceTransaction)\n            .next(holdsPrimaryLease => {\n              if (holdsPrimaryLease) {\n                return /* holdsPrimaryLease= */ true;\n              }\n              return this.canActAsPrimary(persistenceTransaction);\n            })\n            .next(holdsPrimaryLease => {\n              if (!holdsPrimaryLease) {\n                logError(\n                  `Failed to obtain primary lease for action '${action}'.`\n                );\n                this.isPrimary = false;\n                this.queue.enqueueAndForget(() =>\n                  this.primaryStateListener(false)\n                );\n                throw new FirestoreError(\n                  Code.FAILED_PRECONDITION,\n                  PRIMARY_LEASE_LOST_ERROR_MSG\n                );\n              }\n              return transactionOperation(persistenceTransaction);\n            })\n            .next(result => {\n              return this.acquireOrExtendPrimaryLease(\n                persistenceTransaction\n              ).next(() => result);\n            });\n        } else {\n          return this.verifyAllowTabSynchronization(\n            persistenceTransaction\n          ).next(() => transactionOperation(persistenceTransaction));\n        }\n      })\n      .then(result => {\n        persistenceTransaction.raiseOnCommittedEvent();\n        return result;\n      });\n  }\n\n  /**\n   * Verifies that the current tab is the primary leaseholder or alternatively\n   * that the leaseholder has opted into multi-tab synchronization.\n   */\n  // TODO(b/114226234): Remove this check when `synchronizeTabs` can no longer\n  // be turned off.\n  private verifyAllowTabSynchronization(\n    txn: PersistenceTransaction\n  ): PersistencePromise<void> {\n    const store = primaryClientStore(txn);\n    return store.get(DbPrimaryClient.key).next(currentPrimary => {\n      const currentLeaseIsValid =\n        currentPrimary !== null &&\n        this.isWithinAge(\n          currentPrimary.leaseTimestampMs,\n          MAX_PRIMARY_ELIGIBLE_AGE_MS\n        ) &&\n        !this.isClientZombied(currentPrimary.ownerId);\n\n      if (currentLeaseIsValid && !this.isLocalClient(currentPrimary)) {\n        if (\n          !this.allowTabSynchronization ||\n          !currentPrimary!.allowTabSynchronization\n        ) {\n          throw new FirestoreError(\n            Code.FAILED_PRECONDITION,\n            PRIMARY_LEASE_EXCLUSIVE_ERROR_MSG\n          );\n        }\n      }\n    });\n  }\n\n  /**\n   * Obtains or extends the new primary lease for the local client. This\n   * method does not verify that the client is eligible for this lease.\n   */\n  private acquireOrExtendPrimaryLease(\n    txn: PersistenceTransaction\n  ): PersistencePromise<void> {\n    const newPrimary = new DbPrimaryClient(\n      this.clientId,\n      this.allowTabSynchronization,\n      Date.now()\n    );\n    return primaryClientStore(txn).put(DbPrimaryClient.key, newPrimary);\n  }\n\n  static isAvailable(): boolean {\n    return SimpleDb.isAvailable();\n  }\n\n  /**\n   * Generates a string used as a prefix when storing data in IndexedDB and\n   * LocalStorage.\n   */\n  static buildStoragePrefix(databaseInfo: DatabaseInfo): string {\n    // Use two different prefix formats:\n    //\n    //   * firestore / persistenceKey / projectID . databaseID / ...\n    //   * firestore / persistenceKey / projectID / ...\n    //\n    // projectIDs are DNS-compatible names and cannot contain dots\n    // so there's no danger of collisions.\n    let database = databaseInfo.databaseId.projectId;\n    if (!databaseInfo.databaseId.isDefaultDatabase) {\n      database += '.' + databaseInfo.databaseId.database;\n    }\n\n    return 'firestore/' + databaseInfo.persistenceKey + '/' + database + '/';\n  }\n\n  /** Checks the primary lease and removes it if we are the current primary. */\n  private releasePrimaryLeaseIfHeld(\n    txn: PersistenceTransaction\n  ): PersistencePromise<void> {\n    const store = primaryClientStore(txn);\n    return store.get(DbPrimaryClient.key).next(primaryClient => {\n      if (this.isLocalClient(primaryClient)) {\n        logDebug(LOG_TAG, 'Releasing primary lease.');\n        return store.delete(DbPrimaryClient.key);\n      } else {\n        return PersistencePromise.resolve();\n      }\n    });\n  }\n\n  /** Verifies that `updateTimeMs` is within `maxAgeMs`. */\n  private isWithinAge(updateTimeMs: number, maxAgeMs: number): boolean {\n    const now = Date.now();\n    const minAcceptable = now - maxAgeMs;\n    const maxAcceptable = now;\n    if (updateTimeMs < minAcceptable) {\n      return false;\n    } else if (updateTimeMs > maxAcceptable) {\n      logError(\n        `Detected an update time that is in the future: ${updateTimeMs} > ${maxAcceptable}`\n      );\n      return false;\n    }\n\n    return true;\n  }\n\n  private attachVisibilityHandler(): void {\n    if (\n      this.document !== null &&\n      typeof this.document.addEventListener === 'function'\n    ) {\n      this.documentVisibilityHandler = () => {\n        this.queue.enqueueAndForget(() => {\n          this.inForeground = this.document!.visibilityState === 'visible';\n          return this.updateClientMetadataAndTryBecomePrimary();\n        });\n      };\n\n      this.document.addEventListener(\n        'visibilitychange',\n        this.documentVisibilityHandler\n      );\n\n      this.inForeground = this.document.visibilityState === 'visible';\n    }\n  }\n\n  private detachVisibilityHandler(): void {\n    if (this.documentVisibilityHandler) {\n      debugAssert(\n        this.document !== null &&\n          typeof this.document.addEventListener === 'function',\n        \"Expected 'document.addEventListener' to be a function\"\n      );\n      this.document.removeEventListener(\n        'visibilitychange',\n        this.documentVisibilityHandler\n      );\n      this.documentVisibilityHandler = null;\n    }\n  }\n\n  /**\n   * Attaches a window.unload handler that will synchronously write our\n   * clientId to a \"zombie client id\" location in LocalStorage. This can be used\n   * by tabs trying to acquire the primary lease to determine that the lease\n   * is no longer valid even if the timestamp is recent. This is particularly\n   * important for the refresh case (so the tab correctly re-acquires the\n   * primary lease). LocalStorage is used for this rather than IndexedDb because\n   * it is a synchronous API and so can be used reliably from  an unload\n   * handler.\n   */\n  private attachWindowUnloadHook(): void {\n    if (typeof this.window.addEventListener === 'function') {\n      this.windowUnloadHandler = () => {\n        // Note: In theory, this should be scheduled on the AsyncQueue since it\n        // accesses internal state. We execute this code directly during shutdown\n        // to make sure it gets a chance to run.\n        this.markClientZombied();\n\n        this.queue.enqueueAndForget(() => {\n          // Attempt graceful shutdown (including releasing our primary lease),\n          // but there's no guarantee it will complete.\n          return this.shutdown();\n        });\n      };\n      this.window.addEventListener('unload', this.windowUnloadHandler);\n    }\n  }\n\n  private detachWindowUnloadHook(): void {\n    if (this.windowUnloadHandler) {\n      debugAssert(\n        typeof this.window.removeEventListener === 'function',\n        \"Expected 'window.removeEventListener' to be a function\"\n      );\n      this.window.removeEventListener('unload', this.windowUnloadHandler);\n      this.windowUnloadHandler = null;\n    }\n  }\n\n  /**\n   * Returns whether a client is \"zombied\" based on its LocalStorage entry.\n   * Clients become zombied when their tab closes without running all of the\n   * cleanup logic in `shutdown()`.\n   */\n  private isClientZombied(clientId: ClientId): boolean {\n    try {\n      const isZombied =\n        this.webStorage.getItem(this.zombiedClientLocalStorageKey(clientId)) !==\n        null;\n      logDebug(\n        LOG_TAG,\n        `Client '${clientId}' ${\n          isZombied ? 'is' : 'is not'\n        } zombied in LocalStorage`\n      );\n      return isZombied;\n    } catch (e) {\n      // Gracefully handle if LocalStorage isn't working.\n      logError(LOG_TAG, 'Failed to get zombied client id.', e);\n      return false;\n    }\n  }\n\n  /**\n   * Record client as zombied (a client that had its tab closed). Zombied\n   * clients are ignored during primary tab selection.\n   */\n  private markClientZombied(): void {\n    try {\n      this.webStorage.setItem(\n        this.zombiedClientLocalStorageKey(this.clientId),\n        String(Date.now())\n      );\n    } catch (e) {\n      // Gracefully handle if LocalStorage isn't available / working.\n      logError('Failed to set zombie client id.', e);\n    }\n  }\n\n  /** Removes the zombied client entry if it exists. */\n  private removeClientZombiedEntry(): void {\n    try {\n      this.webStorage.removeItem(\n        this.zombiedClientLocalStorageKey(this.clientId)\n      );\n    } catch (e) {\n      // Ignore\n    }\n  }\n\n  private zombiedClientLocalStorageKey(clientId: ClientId): string {\n    return `${ZOMBIED_CLIENTS_KEY_PREFIX}_${this.persistenceKey}_${clientId}`;\n  }\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the primary client object store.\n */\nfunction primaryClientStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbPrimaryClientKey, DbPrimaryClient> {\n  return IndexedDbPersistence.getStore<DbPrimaryClientKey, DbPrimaryClient>(\n    txn,\n    DbPrimaryClient.store\n  );\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the client metadata object store.\n */\nfunction clientMetadataStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbClientMetadataKey, DbClientMetadata> {\n  return IndexedDbPersistence.getStore<DbClientMetadataKey, DbClientMetadata>(\n    txn,\n    DbClientMetadata.store\n  );\n}\n\n/** Provides LRU functionality for IndexedDB persistence. */\nexport class IndexedDbLruDelegate implements ReferenceDelegate, LruDelegate {\n  readonly garbageCollector: LruGarbageCollector;\n\n  constructor(private readonly db: IndexedDbPersistence, params: LruParams) {\n    this.garbageCollector = new LruGarbageCollector(this, params);\n  }\n\n  getSequenceNumberCount(\n    txn: PersistenceTransaction\n  ): PersistencePromise<number> {\n    const docCountPromise = this.orphanedDocumentCount(txn);\n    const targetCountPromise = this.db.getTargetCache().getTargetCount(txn);\n    return targetCountPromise.next(targetCount =>\n      docCountPromise.next(docCount => targetCount + docCount)\n    );\n  }\n\n  private orphanedDocumentCount(\n    txn: PersistenceTransaction\n  ): PersistencePromise<number> {\n    let orphanedCount = 0;\n    return this.forEachOrphanedDocumentSequenceNumber(txn, _ => {\n      orphanedCount++;\n    }).next(() => orphanedCount);\n  }\n\n  forEachTarget(\n    txn: PersistenceTransaction,\n    f: (q: TargetData) => void\n  ): PersistencePromise<void> {\n    return this.db.getTargetCache().forEachTarget(txn, f);\n  }\n\n  forEachOrphanedDocumentSequenceNumber(\n    txn: PersistenceTransaction,\n    f: (sequenceNumber: ListenSequenceNumber) => void\n  ): PersistencePromise<void> {\n    return this.forEachOrphanedDocument(txn, (docKey, sequenceNumber) =>\n      f(sequenceNumber)\n    );\n  }\n\n  addReference(\n    txn: PersistenceTransaction,\n    targetId: TargetId,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    return writeSentinelKey(txn, key);\n  }\n\n  removeReference(\n    txn: PersistenceTransaction,\n    targetId: TargetId,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    return writeSentinelKey(txn, key);\n  }\n\n  removeTargets(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber,\n    activeTargetIds: ActiveTargets\n  ): PersistencePromise<number> {\n    return this.db\n      .getTargetCache()\n      .removeTargets(txn, upperBound, activeTargetIds);\n  }\n\n  markPotentiallyOrphaned(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    return writeSentinelKey(txn, key);\n  }\n\n  /**\n   * Returns true if anything would prevent this document from being garbage\n   * collected, given that the document in question is not present in any\n   * targets and has a sequence number less than or equal to the upper bound for\n   * the collection run.\n   */\n  private isPinned(\n    txn: PersistenceTransaction,\n    docKey: DocumentKey\n  ): PersistencePromise<boolean> {\n    return mutationQueuesContainKey(txn, docKey);\n  }\n\n  removeOrphanedDocuments(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber\n  ): PersistencePromise<number> {\n    const documentCache = this.db.getRemoteDocumentCache();\n    const changeBuffer = documentCache.newChangeBuffer();\n\n    const promises: Array<PersistencePromise<void>> = [];\n    let documentCount = 0;\n\n    const iteration = this.forEachOrphanedDocument(\n      txn,\n      (docKey, sequenceNumber) => {\n        if (sequenceNumber <= upperBound) {\n          const p = this.isPinned(txn, docKey).next(isPinned => {\n            if (!isPinned) {\n              documentCount++;\n              // Our size accounting requires us to read all documents before\n              // removing them.\n              return changeBuffer.getEntry(txn, docKey).next(() => {\n                changeBuffer.removeEntry(docKey);\n                return documentTargetStore(txn).delete(sentinelKey(docKey));\n              });\n            }\n          });\n          promises.push(p);\n        }\n      }\n    );\n\n    return iteration\n      .next(() => PersistencePromise.waitFor(promises))\n      .next(() => changeBuffer.apply(txn))\n      .next(() => documentCount);\n  }\n\n  removeTarget(\n    txn: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    const updated = targetData.withSequenceNumber(txn.currentSequenceNumber);\n    return this.db.getTargetCache().updateTargetData(txn, updated);\n  }\n\n  updateLimboDocument(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    return writeSentinelKey(txn, key);\n  }\n\n  /**\n   * Call provided function for each document in the cache that is 'orphaned'. Orphaned\n   * means not a part of any target, so the only entry in the target-document index for\n   * that document will be the sentinel row (targetId 0), which will also have the sequence\n   * number for the last time the document was accessed.\n   */\n  private forEachOrphanedDocument(\n    txn: PersistenceTransaction,\n    f: (docKey: DocumentKey, sequenceNumber: ListenSequenceNumber) => void\n  ): PersistencePromise<void> {\n    const store = documentTargetStore(txn);\n    let nextToReport: ListenSequenceNumber = ListenSequence.INVALID;\n    let nextPath: EncodedResourcePath;\n    return store\n      .iterate(\n        {\n          index: DbTargetDocument.documentTargetsIndex\n        },\n        ([targetId, docKey], { path, sequenceNumber }) => {\n          if (targetId === 0) {\n            // if nextToReport is valid, report it, this is a new key so the\n            // last one must not be a member of any targets.\n            if (nextToReport !== ListenSequence.INVALID) {\n              f(new DocumentKey(decodeResourcePath(nextPath)), nextToReport);\n            }\n            // set nextToReport to be this sequence number. It's the next one we\n            // might report, if we don't find any targets for this document.\n            // Note that the sequence number must be defined when the targetId\n            // is 0.\n            nextToReport = sequenceNumber!;\n            nextPath = path;\n          } else {\n            // set nextToReport to be invalid, we know we don't need to report\n            // this one since we found a target for it.\n            nextToReport = ListenSequence.INVALID;\n          }\n        }\n      )\n      .next(() => {\n        // Since we report sequence numbers after getting to the next key, we\n        // need to check if the last key we iterated over was an orphaned\n        // document and report it.\n        if (nextToReport !== ListenSequence.INVALID) {\n          f(new DocumentKey(decodeResourcePath(nextPath)), nextToReport);\n        }\n      });\n  }\n\n  getCacheSize(txn: PersistenceTransaction): PersistencePromise<number> {\n    return this.db.getRemoteDocumentCache().getSize(txn);\n  }\n}\n\nfunction sentinelKey(key: DocumentKey): [TargetId, EncodedResourcePath] {\n  return [0, encodeResourcePath(key.path)];\n}\n\n/**\n * @return A value suitable for writing a sentinel row in the target-document\n * store.\n */\nfunction sentinelRow(\n  key: DocumentKey,\n  sequenceNumber: ListenSequenceNumber\n): DbTargetDocument {\n  return new DbTargetDocument(0, encodeResourcePath(key.path), sequenceNumber);\n}\n\nfunction writeSentinelKey(\n  txn: PersistenceTransaction,\n  key: DocumentKey\n): PersistencePromise<void> {\n  return documentTargetStore(txn).put(\n    sentinelRow(key, txn.currentSequenceNumber)\n  );\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Timestamp } from '../api/timestamp';\nimport { User } from '../auth/user';\nimport { Query } from '../core/query';\nimport { BatchId } from '../core/types';\nimport { DocumentKeySet } from '../model/collections';\nimport { DocumentKey } from '../model/document_key';\nimport { Mutation } from '../model/mutation';\nimport { BATCHID_UNKNOWN, MutationBatch } from '../model/mutation_batch';\nimport { ResourcePath } from '../model/path';\nimport { debugAssert, fail, hardAssert } from '../util/assert';\nimport { primitiveComparator } from '../util/misc';\nimport { ByteString } from '../util/byte_string';\nimport { SortedMap } from '../util/sorted_map';\nimport { SortedSet } from '../util/sorted_set';\nimport { decodeResourcePath } from './encoded_resource_path';\nimport { IndexManager } from './index_manager';\nimport {\n  IndexedDbPersistence,\n  IndexedDbTransaction\n} from './indexeddb_persistence';\nimport {\n  DbDocumentMutation,\n  DbDocumentMutationKey,\n  DbMutationBatch,\n  DbMutationBatchKey,\n  DbMutationQueue,\n  DbMutationQueueKey\n} from './indexeddb_schema';\nimport { LocalSerializer } from './local_serializer';\nimport { MutationQueue } from './mutation_queue';\nimport { PersistenceTransaction, ReferenceDelegate } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { SimpleDbStore, SimpleDbTransaction } from './simple_db';\n\n/** A mutation queue for a specific user, backed by IndexedDB. */\nexport class IndexedDbMutationQueue implements MutationQueue {\n  /**\n   * Caches the document keys for pending mutation batches. If the mutation\n   * has been removed from IndexedDb, the cached value may continue to\n   * be used to retrieve the batch's document keys. To remove a cached value\n   * locally, `removeCachedMutationKeys()` should be invoked either directly\n   * or through `removeMutationBatches()`.\n   *\n   * With multi-tab, when the primary client acknowledges or rejects a mutation,\n   * this cache is used by secondary clients to invalidate the local\n   * view of the documents that were previously affected by the mutation.\n   */\n  // PORTING NOTE: Multi-tab only.\n  private documentKeysByBatchId = {} as { [batchId: number]: DocumentKeySet };\n\n  constructor(\n    /**\n     * The normalized userId (e.g. null UID => \"\" userId) used to store /\n     * retrieve mutations.\n     */\n    private userId: string,\n    private readonly serializer: LocalSerializer,\n    private readonly indexManager: IndexManager,\n    private readonly referenceDelegate: ReferenceDelegate\n  ) {}\n\n  /**\n   * Creates a new mutation queue for the given user.\n   * @param user The user for which to create a mutation queue.\n   * @param serializer The serializer to use when persisting to IndexedDb.\n   */\n  static forUser(\n    user: User,\n    serializer: LocalSerializer,\n    indexManager: IndexManager,\n    referenceDelegate: ReferenceDelegate\n  ): IndexedDbMutationQueue {\n    // TODO(mcg): Figure out what constraints there are on userIDs\n    // In particular, are there any reserved characters? are empty ids allowed?\n    // For the moment store these together in the same mutations table assuming\n    // that empty userIDs aren't allowed.\n    hardAssert(user.uid !== '', 'UserID must not be an empty string.');\n    const userId = user.isAuthenticated() ? user.uid! : '';\n    return new IndexedDbMutationQueue(\n      userId,\n      serializer,\n      indexManager,\n      referenceDelegate\n    );\n  }\n\n  checkEmpty(transaction: PersistenceTransaction): PersistencePromise<boolean> {\n    let empty = true;\n    const range = IDBKeyRange.bound(\n      [this.userId, Number.NEGATIVE_INFINITY],\n      [this.userId, Number.POSITIVE_INFINITY]\n    );\n    return mutationsStore(transaction)\n      .iterate(\n        { index: DbMutationBatch.userMutationsIndex, range },\n        (key, value, control) => {\n          empty = false;\n          control.done();\n        }\n      )\n      .next(() => empty);\n  }\n\n  acknowledgeBatch(\n    transaction: PersistenceTransaction,\n    batch: MutationBatch,\n    streamToken: ByteString\n  ): PersistencePromise<void> {\n    return this.getMutationQueueMetadata(transaction).next(metadata => {\n      // We can't store the resumeToken as a ByteString in IndexedDB, so we\n      // convert it to a Base64 string for storage.\n      metadata.lastStreamToken = streamToken.toBase64();\n\n      return mutationQueuesStore(transaction).put(metadata);\n    });\n  }\n\n  getLastStreamToken(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<ByteString> {\n    return this.getMutationQueueMetadata(transaction).next<ByteString>(\n      metadata => ByteString.fromBase64String(metadata.lastStreamToken)\n    );\n  }\n\n  setLastStreamToken(\n    transaction: PersistenceTransaction,\n    streamToken: ByteString\n  ): PersistencePromise<void> {\n    return this.getMutationQueueMetadata(transaction).next(metadata => {\n      // We can't store the resumeToken as a ByteString in IndexedDB, so we\n      // convert it to a Base64 string for storage.\n      metadata.lastStreamToken = streamToken.toBase64();\n      return mutationQueuesStore(transaction).put(metadata);\n    });\n  }\n\n  addMutationBatch(\n    transaction: PersistenceTransaction,\n    localWriteTime: Timestamp,\n    baseMutations: Mutation[],\n    mutations: Mutation[]\n  ): PersistencePromise<MutationBatch> {\n    const documentStore = documentMutationsStore(transaction);\n    const mutationStore = mutationsStore(transaction);\n\n    // The IndexedDb implementation in Chrome (and Firefox) does not handle\n    // compound indices that include auto-generated keys correctly. To ensure\n    // that the index entry is added correctly in all browsers, we perform two\n    // writes: The first write is used to retrieve the next auto-generated Batch\n    // ID, and the second write populates the index and stores the actual\n    // mutation batch.\n    // See: https://bugs.chromium.org/p/chromium/issues/detail?id=701972\n\n    // We write an empty object to obtain key\n    // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    return mutationStore.add({} as any).next(batchId => {\n      hardAssert(\n        typeof batchId === 'number',\n        'Auto-generated key is not a number'\n      );\n\n      const batch = new MutationBatch(\n        batchId,\n        localWriteTime,\n        baseMutations,\n        mutations\n      );\n      const dbBatch = this.serializer.toDbMutationBatch(this.userId, batch);\n\n      const promises: Array<PersistencePromise<void>> = [];\n      let collectionParents = new SortedSet<ResourcePath>((l, r) =>\n        primitiveComparator(l.canonicalString(), r.canonicalString())\n      );\n      for (const mutation of mutations) {\n        const indexKey = DbDocumentMutation.key(\n          this.userId,\n          mutation.key.path,\n          batchId\n        );\n        collectionParents = collectionParents.add(mutation.key.path.popLast());\n        promises.push(mutationStore.put(dbBatch));\n        promises.push(\n          documentStore.put(indexKey, DbDocumentMutation.PLACEHOLDER)\n        );\n      }\n\n      collectionParents.forEach(parent => {\n        promises.push(\n          this.indexManager.addToCollectionParentIndex(transaction, parent)\n        );\n      });\n\n      transaction.addOnCommittedListener(() => {\n        this.documentKeysByBatchId[batchId] = batch.keys();\n      });\n\n      return PersistencePromise.waitFor(promises).next(() => batch);\n    });\n  }\n\n  lookupMutationBatch(\n    transaction: PersistenceTransaction,\n    batchId: BatchId\n  ): PersistencePromise<MutationBatch | null> {\n    return mutationsStore(transaction)\n      .get(batchId)\n      .next(dbBatch => {\n        if (dbBatch) {\n          hardAssert(\n            dbBatch.userId === this.userId,\n            `Unexpected user '${dbBatch.userId}' for mutation batch ${batchId}`\n          );\n          return this.serializer.fromDbMutationBatch(dbBatch);\n        }\n        return null;\n      });\n  }\n\n  /**\n   * Returns the document keys for the mutation batch with the given batchId.\n   * For primary clients, this method returns `null` after\n   * `removeMutationBatches()` has been called. Secondary clients return a\n   * cached result until `removeCachedMutationKeys()` is invoked.\n   */\n  // PORTING NOTE: Multi-tab only.\n  lookupMutationKeys(\n    transaction: PersistenceTransaction,\n    batchId: BatchId\n  ): PersistencePromise<DocumentKeySet | null> {\n    if (this.documentKeysByBatchId[batchId]) {\n      return PersistencePromise.resolve<DocumentKeySet | null>(\n        this.documentKeysByBatchId[batchId]\n      );\n    } else {\n      return this.lookupMutationBatch(transaction, batchId).next(batch => {\n        if (batch) {\n          const keys = batch.keys();\n          this.documentKeysByBatchId[batchId] = keys;\n          return keys;\n        } else {\n          return null;\n        }\n      });\n    }\n  }\n\n  getNextMutationBatchAfterBatchId(\n    transaction: PersistenceTransaction,\n    batchId: BatchId\n  ): PersistencePromise<MutationBatch | null> {\n    const nextBatchId = batchId + 1;\n\n    const range = IDBKeyRange.lowerBound([this.userId, nextBatchId]);\n    let foundBatch: MutationBatch | null = null;\n    return mutationsStore(transaction)\n      .iterate(\n        { index: DbMutationBatch.userMutationsIndex, range },\n        (key, dbBatch, control) => {\n          if (dbBatch.userId === this.userId) {\n            hardAssert(\n              dbBatch.batchId >= nextBatchId,\n              'Should have found mutation after ' + nextBatchId\n            );\n            foundBatch = this.serializer.fromDbMutationBatch(dbBatch);\n          }\n          control.done();\n        }\n      )\n      .next(() => foundBatch);\n  }\n\n  getHighestUnacknowledgedBatchId(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<BatchId> {\n    const range = IDBKeyRange.upperBound([\n      this.userId,\n      Number.POSITIVE_INFINITY\n    ]);\n\n    let batchId = BATCHID_UNKNOWN;\n    return mutationsStore(transaction)\n      .iterate(\n        { index: DbMutationBatch.userMutationsIndex, range, reverse: true },\n        (key, dbBatch, control) => {\n          batchId = dbBatch.batchId;\n          control.done();\n        }\n      )\n      .next(() => batchId);\n  }\n\n  getAllMutationBatches(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<MutationBatch[]> {\n    const range = IDBKeyRange.bound(\n      [this.userId, BATCHID_UNKNOWN],\n      [this.userId, Number.POSITIVE_INFINITY]\n    );\n    return mutationsStore(transaction)\n      .loadAll(DbMutationBatch.userMutationsIndex, range)\n      .next(dbBatches =>\n        dbBatches.map(dbBatch => this.serializer.fromDbMutationBatch(dbBatch))\n      );\n  }\n\n  getAllMutationBatchesAffectingDocumentKey(\n    transaction: PersistenceTransaction,\n    documentKey: DocumentKey\n  ): PersistencePromise<MutationBatch[]> {\n    // Scan the document-mutation index starting with a prefix starting with\n    // the given documentKey.\n    const indexPrefix = DbDocumentMutation.prefixForPath(\n      this.userId,\n      documentKey.path\n    );\n    const indexStart = IDBKeyRange.lowerBound(indexPrefix);\n\n    const results: MutationBatch[] = [];\n    return documentMutationsStore(transaction)\n      .iterate({ range: indexStart }, (indexKey, _, control) => {\n        const [userID, encodedPath, batchId] = indexKey;\n\n        // Only consider rows matching exactly the specific key of\n        // interest. Note that because we order by path first, and we\n        // order terminators before path separators, we'll encounter all\n        // the index rows for documentKey contiguously. In particular, all\n        // the rows for documentKey will occur before any rows for\n        // documents nested in a subcollection beneath documentKey so we\n        // can stop as soon as we hit any such row.\n        const path = decodeResourcePath(encodedPath);\n        if (userID !== this.userId || !documentKey.path.isEqual(path)) {\n          control.done();\n          return;\n        }\n        // Look up the mutation batch in the store.\n        return mutationsStore(transaction)\n          .get(batchId)\n          .next(mutation => {\n            if (!mutation) {\n              throw fail(\n                'Dangling document-mutation reference found: ' +\n                  indexKey +\n                  ' which points to ' +\n                  batchId\n              );\n            }\n            hardAssert(\n              mutation.userId === this.userId,\n              `Unexpected user '${mutation.userId}' for mutation batch ${batchId}`\n            );\n            results.push(this.serializer.fromDbMutationBatch(mutation));\n          });\n      })\n      .next(() => results);\n  }\n\n  getAllMutationBatchesAffectingDocumentKeys(\n    transaction: PersistenceTransaction,\n    documentKeys: SortedMap<DocumentKey, unknown>\n  ): PersistencePromise<MutationBatch[]> {\n    let uniqueBatchIDs = new SortedSet<BatchId>(primitiveComparator);\n\n    const promises: Array<PersistencePromise<void>> = [];\n    documentKeys.forEach(documentKey => {\n      const indexStart = DbDocumentMutation.prefixForPath(\n        this.userId,\n        documentKey.path\n      );\n      const range = IDBKeyRange.lowerBound(indexStart);\n\n      const promise = documentMutationsStore(transaction).iterate(\n        { range },\n        (indexKey, _, control) => {\n          const [userID, encodedPath, batchID] = indexKey;\n\n          // Only consider rows matching exactly the specific key of\n          // interest. Note that because we order by path first, and we\n          // order terminators before path separators, we'll encounter all\n          // the index rows for documentKey contiguously. In particular, all\n          // the rows for documentKey will occur before any rows for\n          // documents nested in a subcollection beneath documentKey so we\n          // can stop as soon as we hit any such row.\n          const path = decodeResourcePath(encodedPath);\n          if (userID !== this.userId || !documentKey.path.isEqual(path)) {\n            control.done();\n            return;\n          }\n\n          uniqueBatchIDs = uniqueBatchIDs.add(batchID);\n        }\n      );\n\n      promises.push(promise);\n    });\n\n    return PersistencePromise.waitFor(promises).next(() =>\n      this.lookupMutationBatches(transaction, uniqueBatchIDs)\n    );\n  }\n\n  getAllMutationBatchesAffectingQuery(\n    transaction: PersistenceTransaction,\n    query: Query\n  ): PersistencePromise<MutationBatch[]> {\n    debugAssert(\n      !query.isDocumentQuery(),\n      \"Document queries shouldn't go down this path\"\n    );\n    debugAssert(\n      !query.isCollectionGroupQuery(),\n      'CollectionGroup queries should be handled in LocalDocumentsView'\n    );\n\n    const queryPath = query.path;\n    const immediateChildrenLength = queryPath.length + 1;\n\n    // TODO(mcg): Actually implement a single-collection query\n    //\n    // This is actually executing an ancestor query, traversing the whole\n    // subtree below the collection which can be horrifically inefficient for\n    // some structures. The right way to solve this is to implement the full\n    // value index, but that's not in the cards in the near future so this is\n    // the best we can do for the moment.\n    //\n    // Since we don't yet index the actual properties in the mutations, our\n    // current approach is to just return all mutation batches that affect\n    // documents in the collection being queried.\n    const indexPrefix = DbDocumentMutation.prefixForPath(\n      this.userId,\n      queryPath\n    );\n    const indexStart = IDBKeyRange.lowerBound(indexPrefix);\n\n    // Collect up unique batchIDs encountered during a scan of the index. Use a\n    // SortedSet to accumulate batch IDs so they can be traversed in order in a\n    // scan of the main table.\n    let uniqueBatchIDs = new SortedSet<BatchId>(primitiveComparator);\n    return documentMutationsStore(transaction)\n      .iterate({ range: indexStart }, (indexKey, _, control) => {\n        const [userID, encodedPath, batchID] = indexKey;\n        const path = decodeResourcePath(encodedPath);\n        if (userID !== this.userId || !queryPath.isPrefixOf(path)) {\n          control.done();\n          return;\n        }\n        // Rows with document keys more than one segment longer than the\n        // query path can't be matches. For example, a query on 'rooms'\n        // can't match the document /rooms/abc/messages/xyx.\n        // TODO(mcg): we'll need a different scanner when we implement\n        // ancestor queries.\n        if (path.length !== immediateChildrenLength) {\n          return;\n        }\n        uniqueBatchIDs = uniqueBatchIDs.add(batchID);\n      })\n      .next(() => this.lookupMutationBatches(transaction, uniqueBatchIDs));\n  }\n\n  private lookupMutationBatches(\n    transaction: PersistenceTransaction,\n    batchIDs: SortedSet<BatchId>\n  ): PersistencePromise<MutationBatch[]> {\n    const results: MutationBatch[] = [];\n    const promises: Array<PersistencePromise<void>> = [];\n    // TODO(rockwood): Implement this using iterate.\n    batchIDs.forEach(batchId => {\n      promises.push(\n        mutationsStore(transaction)\n          .get(batchId)\n          .next(mutation => {\n            if (mutation === null) {\n              throw fail(\n                'Dangling document-mutation reference found, ' +\n                  'which points to ' +\n                  batchId\n              );\n            }\n            hardAssert(\n              mutation.userId === this.userId,\n              `Unexpected user '${mutation.userId}' for mutation batch ${batchId}`\n            );\n            results.push(this.serializer.fromDbMutationBatch(mutation));\n          })\n      );\n    });\n    return PersistencePromise.waitFor(promises).next(() => results);\n  }\n\n  removeMutationBatch(\n    transaction: PersistenceTransaction,\n    batch: MutationBatch\n  ): PersistencePromise<void> {\n    return removeMutationBatch(\n      (transaction as IndexedDbTransaction).simpleDbTransaction,\n      this.userId,\n      batch\n    ).next(removedDocuments => {\n      transaction.addOnCommittedListener(() => {\n        this.removeCachedMutationKeys(batch.batchId);\n      });\n      return PersistencePromise.forEach(\n        removedDocuments,\n        (key: DocumentKey) => {\n          return this.referenceDelegate.markPotentiallyOrphaned(\n            transaction,\n            key\n          );\n        }\n      );\n    });\n  }\n\n  /**\n   * Clears the cached keys for a mutation batch. This method should be\n   * called by secondary clients after they process mutation updates.\n   *\n   * Note that this method does not have to be called from primary clients as\n   * the corresponding cache entries are cleared when an acknowledged or\n   * rejected batch is removed from the mutation queue.\n   */\n  // PORTING NOTE: Multi-tab only\n  removeCachedMutationKeys(batchId: BatchId): void {\n    delete this.documentKeysByBatchId[batchId];\n  }\n\n  performConsistencyCheck(\n    txn: PersistenceTransaction\n  ): PersistencePromise<void> {\n    return this.checkEmpty(txn).next(empty => {\n      if (!empty) {\n        return PersistencePromise.resolve();\n      }\n\n      // Verify that there are no entries in the documentMutations index if\n      // the queue is empty.\n      const startRange = IDBKeyRange.lowerBound(\n        DbDocumentMutation.prefixForUser(this.userId)\n      );\n      const danglingMutationReferences: ResourcePath[] = [];\n      return documentMutationsStore(txn)\n        .iterate({ range: startRange }, (key, _, control) => {\n          const userID = key[0];\n          if (userID !== this.userId) {\n            control.done();\n            return;\n          } else {\n            const path = decodeResourcePath(key[1]);\n            danglingMutationReferences.push(path);\n          }\n        })\n        .next(() => {\n          hardAssert(\n            danglingMutationReferences.length === 0,\n            'Document leak -- detected dangling mutation references when queue is empty. ' +\n              'Dangling keys: ' +\n              danglingMutationReferences.map(p => p.canonicalString())\n          );\n        });\n    });\n  }\n\n  containsKey(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<boolean> {\n    return mutationQueueContainsKey(txn, this.userId, key);\n  }\n\n  // PORTING NOTE: Multi-tab only (state is held in memory in other clients).\n  /** Returns the mutation queue's metadata from IndexedDb. */\n  private getMutationQueueMetadata(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<DbMutationQueue> {\n    return mutationQueuesStore(transaction)\n      .get(this.userId)\n      .next((metadata: DbMutationQueue | null) => {\n        return (\n          metadata ||\n          new DbMutationQueue(\n            this.userId,\n            BATCHID_UNKNOWN,\n            /*lastStreamToken=*/ ''\n          )\n        );\n      });\n  }\n}\n\n/**\n * @return true if the mutation queue for the given user contains a pending\n *         mutation for the given key.\n */\nfunction mutationQueueContainsKey(\n  txn: PersistenceTransaction,\n  userId: string,\n  key: DocumentKey\n): PersistencePromise<boolean> {\n  const indexKey = DbDocumentMutation.prefixForPath(userId, key.path);\n  const encodedPath = indexKey[1];\n  const startRange = IDBKeyRange.lowerBound(indexKey);\n  let containsKey = false;\n  return documentMutationsStore(txn)\n    .iterate({ range: startRange, keysOnly: true }, (key, value, control) => {\n      const [userID, keyPath, /*batchID*/ _] = key;\n      if (userID === userId && keyPath === encodedPath) {\n        containsKey = true;\n      }\n      control.done();\n    })\n    .next(() => containsKey);\n}\n\n/** Returns true if any mutation queue contains the given document. */\nexport function mutationQueuesContainKey(\n  txn: PersistenceTransaction,\n  docKey: DocumentKey\n): PersistencePromise<boolean> {\n  let found = false;\n  return mutationQueuesStore(txn)\n    .iterateSerial(userId => {\n      return mutationQueueContainsKey(txn, userId, docKey).next(containsKey => {\n        if (containsKey) {\n          found = true;\n        }\n        return PersistencePromise.resolve(!containsKey);\n      });\n    })\n    .next(() => found);\n}\n\n/**\n * Delete a mutation batch and the associated document mutations.\n * @return A PersistencePromise of the document mutations that were removed.\n */\nexport function removeMutationBatch(\n  txn: SimpleDbTransaction,\n  userId: string,\n  batch: MutationBatch\n): PersistencePromise<DocumentKey[]> {\n  const mutationStore = txn.store<DbMutationBatchKey, DbMutationBatch>(\n    DbMutationBatch.store\n  );\n  const indexTxn = txn.store<DbDocumentMutationKey, DbDocumentMutation>(\n    DbDocumentMutation.store\n  );\n  const promises: Array<PersistencePromise<void>> = [];\n\n  const range = IDBKeyRange.only(batch.batchId);\n  let numDeleted = 0;\n  const removePromise = mutationStore.iterate(\n    { range },\n    (key, value, control) => {\n      numDeleted++;\n      return control.delete();\n    }\n  );\n  promises.push(\n    removePromise.next(() => {\n      hardAssert(\n        numDeleted === 1,\n        'Dangling document-mutation reference found: Missing batch ' +\n          batch.batchId\n      );\n    })\n  );\n  const removedDocuments: DocumentKey[] = [];\n  for (const mutation of batch.mutations) {\n    const indexKey = DbDocumentMutation.key(\n      userId,\n      mutation.key.path,\n      batch.batchId\n    );\n    promises.push(indexTxn.delete(indexKey));\n    removedDocuments.push(mutation.key);\n  }\n  return PersistencePromise.waitFor(promises).next(() => removedDocuments);\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the mutations object store.\n */\nfunction mutationsStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbMutationBatchKey, DbMutationBatch> {\n  return IndexedDbPersistence.getStore<DbMutationBatchKey, DbMutationBatch>(\n    txn,\n    DbMutationBatch.store\n  );\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the mutationQueues object store.\n */\nfunction documentMutationsStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbDocumentMutationKey, DbDocumentMutation> {\n  return IndexedDbPersistence.getStore<\n    DbDocumentMutationKey,\n    DbDocumentMutation\n  >(txn, DbDocumentMutation.store);\n}\n\n/**\n * Helper to get a typed SimpleDbStore for the mutationQueues object store.\n */\nfunction mutationQueuesStore(\n  txn: PersistenceTransaction\n): SimpleDbStore<DbMutationQueueKey, DbMutationQueue> {\n  return IndexedDbPersistence.getStore<DbMutationQueueKey, DbMutationQueue>(\n    txn,\n    DbMutationQueue.store\n  );\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { BatchId, ListenSequenceNumber, TargetId } from '../core/types';\nimport { ResourcePath } from '../model/path';\nimport * as api from '../protos/firestore_proto_api';\nimport { hardAssert, debugAssert } from '../util/assert';\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { BATCHID_UNKNOWN } from '../model/mutation_batch';\nimport {\n  decodeResourcePath,\n  encodeResourcePath,\n  EncodedResourcePath\n} from './encoded_resource_path';\nimport { removeMutationBatch } from './indexeddb_mutation_queue';\nimport { dbDocumentSize } from './indexeddb_remote_document_cache';\nimport { LocalSerializer } from './local_serializer';\nimport { MemoryCollectionParentIndex } from './memory_index_manager';\nimport { PersistencePromise } from './persistence_promise';\nimport { SimpleDbSchemaConverter, SimpleDbTransaction } from './simple_db';\n\n/**\n * Schema Version for the Web client:\n * 1.  Initial version including Mutation Queue, Query Cache, and Remote\n *     Document Cache\n * 2.  Used to ensure a targetGlobal object exists and add targetCount to it. No\n *     longer required because migration 3 unconditionally clears it.\n * 3.  Dropped and re-created Query Cache to deal with cache corruption related\n *     to limbo resolution. Addresses\n *     https://github.com/firebase/firebase-ios-sdk/issues/1548\n * 4.  Multi-Tab Support.\n * 5.  Removal of held write acks.\n * 6.  Create document global for tracking document cache size.\n * 7.  Ensure every cached document has a sentinel row with a sequence number.\n * 8.  Add collection-parent index for Collection Group queries.\n * 9.  Change RemoteDocumentChanges store to be keyed by readTime rather than\n *     an auto-incrementing ID. This is required for Index-Free queries.\n * 10. Rewrite the canonical IDs to the explicit Protobuf-based format.\n */\nexport const SCHEMA_VERSION = 10;\n\n/** Performs database creation and schema upgrades. */\nexport class SchemaConverter implements SimpleDbSchemaConverter {\n  constructor(private readonly serializer: LocalSerializer) {}\n\n  /**\n   * Performs database creation and schema upgrades.\n   *\n   * Note that in production, this method is only ever used to upgrade the schema\n   * to SCHEMA_VERSION. Different values of toVersion are only used for testing\n   * and local feature development.\n   */\n  createOrUpgrade(\n    db: IDBDatabase,\n    txn: IDBTransaction,\n    fromVersion: number,\n    toVersion: number\n  ): PersistencePromise<void> {\n    hardAssert(\n      fromVersion < toVersion &&\n        fromVersion >= 0 &&\n        toVersion <= SCHEMA_VERSION,\n      `Unexpected schema upgrade from v${fromVersion} to v${toVersion}.`\n    );\n\n    const simpleDbTransaction = new SimpleDbTransaction(txn);\n\n    if (fromVersion < 1 && toVersion >= 1) {\n      createPrimaryClientStore(db);\n      createMutationQueue(db);\n      createQueryCache(db);\n      createRemoteDocumentCache(db);\n    }\n\n    // Migration 2 to populate the targetGlobal object no longer needed since\n    // migration 3 unconditionally clears it.\n\n    let p = PersistencePromise.resolve();\n    if (fromVersion < 3 && toVersion >= 3) {\n      // Brand new clients don't need to drop and recreate--only clients that\n      // potentially have corrupt data.\n      if (fromVersion !== 0) {\n        dropQueryCache(db);\n        createQueryCache(db);\n      }\n      p = p.next(() => writeEmptyTargetGlobalEntry(simpleDbTransaction));\n    }\n\n    if (fromVersion < 4 && toVersion >= 4) {\n      if (fromVersion !== 0) {\n        // Schema version 3 uses auto-generated keys to generate globally unique\n        // mutation batch IDs (this was previously ensured internally by the\n        // client). To migrate to the new schema, we have to read all mutations\n        // and write them back out. We preserve the existing batch IDs to guarantee\n        // consistency with other object stores. Any further mutation batch IDs will\n        // be auto-generated.\n        p = p.next(() =>\n          upgradeMutationBatchSchemaAndMigrateData(db, simpleDbTransaction)\n        );\n      }\n\n      p = p.next(() => {\n        createClientMetadataStore(db);\n      });\n    }\n\n    if (fromVersion < 5 && toVersion >= 5) {\n      p = p.next(() => this.removeAcknowledgedMutations(simpleDbTransaction));\n    }\n\n    if (fromVersion < 6 && toVersion >= 6) {\n      p = p.next(() => {\n        createDocumentGlobalStore(db);\n        return this.addDocumentGlobal(simpleDbTransaction);\n      });\n    }\n\n    if (fromVersion < 7 && toVersion >= 7) {\n      p = p.next(() => this.ensureSequenceNumbers(simpleDbTransaction));\n    }\n\n    if (fromVersion < 8 && toVersion >= 8) {\n      p = p.next(() =>\n        this.createCollectionParentIndex(db, simpleDbTransaction)\n      );\n    }\n\n    if (fromVersion < 9 && toVersion >= 9) {\n      p = p.next(() => {\n        // Multi-Tab used to manage its own changelog, but this has been moved\n        // to the DbRemoteDocument object store itself. Since the previous change\n        // log only contained transient data, we can drop its object store.\n        dropRemoteDocumentChangesStore(db);\n        createRemoteDocumentReadTimeIndex(txn);\n      });\n    }\n\n    if (fromVersion < 10 && toVersion >= 10) {\n      p = p.next(() => this.rewriteCanonicalIds(simpleDbTransaction));\n    }\n    return p;\n  }\n\n  private addDocumentGlobal(\n    txn: SimpleDbTransaction\n  ): PersistencePromise<void> {\n    let byteCount = 0;\n    return txn\n      .store<DbRemoteDocumentKey, DbRemoteDocument>(DbRemoteDocument.store)\n      .iterate((_, doc) => {\n        byteCount += dbDocumentSize(doc);\n      })\n      .next(() => {\n        const metadata = new DbRemoteDocumentGlobal(byteCount);\n        return txn\n          .store<DbRemoteDocumentGlobalKey, DbRemoteDocumentGlobal>(\n            DbRemoteDocumentGlobal.store\n          )\n          .put(DbRemoteDocumentGlobal.key, metadata);\n      });\n  }\n\n  private removeAcknowledgedMutations(\n    txn: SimpleDbTransaction\n  ): PersistencePromise<void> {\n    const queuesStore = txn.store<DbMutationQueueKey, DbMutationQueue>(\n      DbMutationQueue.store\n    );\n    const mutationsStore = txn.store<DbMutationBatchKey, DbMutationBatch>(\n      DbMutationBatch.store\n    );\n\n    return queuesStore.loadAll().next(queues => {\n      return PersistencePromise.forEach(queues, (queue: DbMutationQueue) => {\n        const range = IDBKeyRange.bound(\n          [queue.userId, BATCHID_UNKNOWN],\n          [queue.userId, queue.lastAcknowledgedBatchId]\n        );\n\n        return mutationsStore\n          .loadAll(DbMutationBatch.userMutationsIndex, range)\n          .next(dbBatches => {\n            return PersistencePromise.forEach(\n              dbBatches,\n              (dbBatch: DbMutationBatch) => {\n                hardAssert(\n                  dbBatch.userId === queue.userId,\n                  `Cannot process batch ${dbBatch.batchId} from unexpected user`\n                );\n                const batch = this.serializer.fromDbMutationBatch(dbBatch);\n\n                return removeMutationBatch(\n                  txn,\n                  queue.userId,\n                  batch\n                ).next(() => {});\n              }\n            );\n          });\n      });\n    });\n  }\n\n  /**\n   * Ensures that every document in the remote document cache has a corresponding sentinel row\n   * with a sequence number. Missing rows are given the most recently used sequence number.\n   */\n  private ensureSequenceNumbers(\n    txn: SimpleDbTransaction\n  ): PersistencePromise<void> {\n    const documentTargetStore = txn.store<\n      DbTargetDocumentKey,\n      DbTargetDocument\n    >(DbTargetDocument.store);\n    const documentsStore = txn.store<DbRemoteDocumentKey, DbRemoteDocument>(\n      DbRemoteDocument.store\n    );\n    const globalTargetStore = txn.store<DbTargetGlobalKey, DbTargetGlobal>(\n      DbTargetGlobal.store\n    );\n\n    return globalTargetStore.get(DbTargetGlobal.key).next(metadata => {\n      debugAssert(\n        !!metadata,\n        'Metadata should have been written during the version 3 migration'\n      );\n      const writeSentinelKey = (\n        path: ResourcePath\n      ): PersistencePromise<void> => {\n        return documentTargetStore.put(\n          new DbTargetDocument(\n            0,\n            encodeResourcePath(path),\n            metadata!.highestListenSequenceNumber!\n          )\n        );\n      };\n\n      const promises: Array<PersistencePromise<void>> = [];\n      return documentsStore\n        .iterate((key, doc) => {\n          const path = new ResourcePath(key);\n          const docSentinelKey = sentinelKey(path);\n          promises.push(\n            documentTargetStore.get(docSentinelKey).next(maybeSentinel => {\n              if (!maybeSentinel) {\n                return writeSentinelKey(path);\n              } else {\n                return PersistencePromise.resolve();\n              }\n            })\n          );\n        })\n        .next(() => PersistencePromise.waitFor(promises));\n    });\n  }\n\n  private createCollectionParentIndex(\n    db: IDBDatabase,\n    txn: SimpleDbTransaction\n  ): PersistencePromise<void> {\n    // Create the index.\n    db.createObjectStore(DbCollectionParent.store, {\n      keyPath: DbCollectionParent.keyPath\n    });\n\n    const collectionParentsStore = txn.store<\n      DbCollectionParentKey,\n      DbCollectionParent\n    >(DbCollectionParent.store);\n\n    // Helper to add an index entry iff we haven't already written it.\n    const cache = new MemoryCollectionParentIndex();\n    const addEntry = (\n      collectionPath: ResourcePath\n    ): PersistencePromise<void> | undefined => {\n      if (cache.add(collectionPath)) {\n        const collectionId = collectionPath.lastSegment();\n        const parentPath = collectionPath.popLast();\n        return collectionParentsStore.put({\n          collectionId,\n          parent: encodeResourcePath(parentPath)\n        });\n      }\n    };\n\n    // Index existing remote documents.\n    return txn\n      .store<DbRemoteDocumentKey, DbRemoteDocument>(DbRemoteDocument.store)\n      .iterate({ keysOnly: true }, (pathSegments, _) => {\n        const path = new ResourcePath(pathSegments);\n        return addEntry(path.popLast());\n      })\n      .next(() => {\n        // Index existing mutations.\n        return txn\n          .store<DbDocumentMutationKey, DbDocumentMutation>(\n            DbDocumentMutation.store\n          )\n          .iterate({ keysOnly: true }, ([userID, encodedPath, batchId], _) => {\n            const path = decodeResourcePath(encodedPath);\n            return addEntry(path.popLast());\n          });\n      });\n  }\n\n  private rewriteCanonicalIds(\n    txn: SimpleDbTransaction\n  ): PersistencePromise<void> {\n    const targetStore = txn.store<DbTargetKey, DbTarget>(DbTarget.store);\n    return targetStore.iterate((key, originalDbTarget) => {\n      const originalTargetData = this.serializer.fromDbTarget(originalDbTarget);\n      const updatedDbTarget = this.serializer.toDbTarget(originalTargetData);\n      return targetStore.put(updatedDbTarget);\n    });\n  }\n}\n\nfunction sentinelKey(path: ResourcePath): DbTargetDocumentKey {\n  return [0, encodeResourcePath(path)];\n}\n\n/**\n * Wrapper class to store timestamps (seconds and nanos) in IndexedDb objects.\n */\nexport class DbTimestamp {\n  constructor(public seconds: number, public nanoseconds: number) {}\n}\n\n/** A timestamp type that can be used in IndexedDb keys. */\nexport type DbTimestampKey = [/* seconds */ number, /* nanos */ number];\n\n// The key for the singleton object in the DbPrimaryClient is a single string.\nexport type DbPrimaryClientKey = typeof DbPrimaryClient.key;\n\n/**\n * A singleton object to be stored in the 'owner' store in IndexedDb.\n *\n * A given database can have a single primary tab assigned at a given time. That\n * tab must validate that it is still holding the primary lease before every\n * operation that requires locked access. The primary tab should regularly\n * write an updated timestamp to this lease to prevent other tabs from\n * \"stealing\" the primary lease\n */\nexport class DbPrimaryClient {\n  /**\n   * Name of the IndexedDb object store.\n   *\n   * Note that the name 'owner' is chosen to ensure backwards compatibility with\n   * older clients that only supported single locked access to the persistence\n   * layer.\n   */\n  static store = 'owner';\n\n  /**\n   * The key string used for the single object that exists in the\n   * DbPrimaryClient store.\n   */\n  static key = 'owner';\n\n  constructor(\n    public ownerId: string,\n    /** Whether to allow shared access from multiple tabs. */\n    public allowTabSynchronization: boolean,\n    public leaseTimestampMs: number\n  ) {}\n}\n\nfunction createPrimaryClientStore(db: IDBDatabase): void {\n  db.createObjectStore(DbPrimaryClient.store);\n}\n\n/** Object keys in the 'mutationQueues' store are userId strings. */\nexport type DbMutationQueueKey = string;\n\n/**\n * An object to be stored in the 'mutationQueues' store in IndexedDb.\n *\n * Each user gets a single queue of MutationBatches to apply to the server.\n * DbMutationQueue tracks the metadata about the queue.\n */\nexport class DbMutationQueue {\n  /** Name of the IndexedDb object store.  */\n  static store = 'mutationQueues';\n\n  /** Keys are automatically assigned via the userId property. */\n  static keyPath = 'userId';\n\n  constructor(\n    /**\n     * The normalized user ID to which this queue belongs.\n     */\n    public userId: string,\n    /**\n     * An identifier for the highest numbered batch that has been acknowledged\n     * by the server. All MutationBatches in this queue with batchIds less\n     * than or equal to this value are considered to have been acknowledged by\n     * the server.\n     *\n     * NOTE: this is deprecated and no longer used by the code.\n     */\n    public lastAcknowledgedBatchId: number,\n    /**\n     * A stream token that was previously sent by the server.\n     *\n     * See StreamingWriteRequest in datastore.proto for more details about\n     * usage.\n     *\n     * After sending this token, earlier tokens may not be used anymore so\n     * only a single stream token is retained.\n     */\n    public lastStreamToken: string\n  ) {}\n}\n\n/** The 'mutations' store  is keyed by batch ID. */\nexport type DbMutationBatchKey = BatchId;\n\n/**\n * An object to be stored in the 'mutations' store in IndexedDb.\n *\n * Represents a batch of user-level mutations intended to be sent to the server\n * in a single write. Each user-level batch gets a separate DbMutationBatch\n * with a new batchId.\n */\nexport class DbMutationBatch {\n  /** Name of the IndexedDb object store.  */\n  static store = 'mutations';\n\n  /** Keys are automatically assigned via the userId, batchId properties. */\n  static keyPath = 'batchId';\n\n  /** The index name for lookup of mutations by user. */\n  static userMutationsIndex = 'userMutationsIndex';\n\n  /** The user mutations index is keyed by [userId, batchId] pairs. */\n  static userMutationsKeyPath = ['userId', 'batchId'];\n\n  constructor(\n    /**\n     * The normalized user ID to which this batch belongs.\n     */\n    public userId: string,\n    /**\n     * An identifier for this batch, allocated using an auto-generated key.\n     */\n    public batchId: BatchId,\n    /**\n     * The local write time of the batch, stored as milliseconds since the\n     * epoch.\n     */\n    public localWriteTimeMs: number,\n    /**\n     * A list of \"mutations\" that represent a partial base state from when this\n     * write batch was initially created. During local application of the write\n     * batch, these baseMutations are applied prior to the real writes in order\n     * to override certain document fields from the remote document cache. This\n     * is necessary in the case of non-idempotent writes (e.g. `increment()`\n     * transforms) to make sure that the local view of the modified documents\n     * doesn't flicker if the remote document cache receives the result of the\n     * non-idempotent write before the write is removed from the queue.\n     *\n     * These mutations are never sent to the backend.\n     */\n    public baseMutations: api.Write[] | undefined,\n    /**\n     * A list of mutations to apply. All mutations will be applied atomically.\n     *\n     * Mutations are serialized via JsonProtoSerializer.toMutation().\n     */\n    public mutations: api.Write[]\n  ) {}\n}\n\n/**\n * The key for a db document mutation, which is made up of a userID, path, and\n * batchId. Note that the path must be serialized into a form that indexedDB can\n * sort.\n */\nexport type DbDocumentMutationKey = [string, EncodedResourcePath, BatchId];\n\nfunction createMutationQueue(db: IDBDatabase): void {\n  db.createObjectStore(DbMutationQueue.store, {\n    keyPath: DbMutationQueue.keyPath\n  });\n\n  const mutationBatchesStore = db.createObjectStore(DbMutationBatch.store, {\n    keyPath: DbMutationBatch.keyPath,\n    autoIncrement: true\n  });\n  mutationBatchesStore.createIndex(\n    DbMutationBatch.userMutationsIndex,\n    DbMutationBatch.userMutationsKeyPath,\n    { unique: true }\n  );\n\n  db.createObjectStore(DbDocumentMutation.store);\n}\n\n/**\n * Upgrade function to migrate the 'mutations' store from V1 to V3. Loads\n * and rewrites all data.\n */\nfunction upgradeMutationBatchSchemaAndMigrateData(\n  db: IDBDatabase,\n  txn: SimpleDbTransaction\n): PersistencePromise<void> {\n  const v1MutationsStore = txn.store<[string, number], DbMutationBatch>(\n    DbMutationBatch.store\n  );\n  return v1MutationsStore.loadAll().next(existingMutations => {\n    db.deleteObjectStore(DbMutationBatch.store);\n\n    const mutationsStore = db.createObjectStore(DbMutationBatch.store, {\n      keyPath: DbMutationBatch.keyPath,\n      autoIncrement: true\n    });\n    mutationsStore.createIndex(\n      DbMutationBatch.userMutationsIndex,\n      DbMutationBatch.userMutationsKeyPath,\n      { unique: true }\n    );\n\n    const v3MutationsStore = txn.store<DbMutationBatchKey, DbMutationBatch>(\n      DbMutationBatch.store\n    );\n    const writeAll = existingMutations.map(mutation =>\n      v3MutationsStore.put(mutation)\n    );\n\n    return PersistencePromise.waitFor(writeAll);\n  });\n}\n\n/**\n * An object to be stored in the 'documentMutations' store in IndexedDb.\n *\n * A manually maintained index of all the mutation batches that affect a given\n * document key. The rows in this table are references based on the contents of\n * DbMutationBatch.mutations.\n */\nexport class DbDocumentMutation {\n  static store = 'documentMutations';\n\n  /**\n   * Creates a [userId] key for use in the DbDocumentMutations index to iterate\n   * over all of a user's document mutations.\n   */\n  static prefixForUser(userId: string): [string] {\n    return [userId];\n  }\n\n  /**\n   * Creates a [userId, encodedPath] key for use in the DbDocumentMutations\n   * index to iterate over all at document mutations for a given path or lower.\n   */\n  static prefixForPath(\n    userId: string,\n    path: ResourcePath\n  ): [string, EncodedResourcePath] {\n    return [userId, encodeResourcePath(path)];\n  }\n\n  /**\n   * Creates a full index key of [userId, encodedPath, batchId] for inserting\n   * and deleting into the DbDocumentMutations index.\n   */\n  static key(\n    userId: string,\n    path: ResourcePath,\n    batchId: BatchId\n  ): DbDocumentMutationKey {\n    return [userId, encodeResourcePath(path), batchId];\n  }\n\n  /**\n   * Because we store all the useful information for this store in the key,\n   * there is no useful information to store as the value. The raw (unencoded)\n   * path cannot be stored because IndexedDb doesn't store prototype\n   * information.\n   */\n  static PLACEHOLDER = new DbDocumentMutation();\n\n  private constructor() {}\n}\n\n/**\n * A key in the 'remoteDocuments' object store is a string array containing the\n * segments that make up the path.\n */\nexport type DbRemoteDocumentKey = string[];\n\nfunction createRemoteDocumentCache(db: IDBDatabase): void {\n  db.createObjectStore(DbRemoteDocument.store);\n}\n\n/**\n * Represents the known absence of a document at a particular version.\n * Stored in IndexedDb as part of a DbRemoteDocument object.\n */\nexport class DbNoDocument {\n  constructor(public path: string[], public readTime: DbTimestamp) {}\n}\n\n/**\n * Represents a document that is known to exist but whose data is unknown.\n * Stored in IndexedDb as part of a DbRemoteDocument object.\n */\nexport class DbUnknownDocument {\n  constructor(public path: string[], public version: DbTimestamp) {}\n}\n\n/**\n * An object to be stored in the 'remoteDocuments' store in IndexedDb.\n * It represents either:\n *\n * - A complete document.\n * - A \"no document\" representing a document that is known not to exist (at\n * some version).\n * - An \"unknown document\" representing a document that is known to exist (at\n * some version) but whose contents are unknown.\n *\n * Note: This is the persisted equivalent of a MaybeDocument and could perhaps\n * be made more general if necessary.\n */\nexport class DbRemoteDocument {\n  static store = 'remoteDocuments';\n\n  /**\n   * An index that provides access to all entries sorted by read time (which\n   * corresponds to the last modification time of each row).\n   *\n   * This index is used to provide a changelog for Multi-Tab.\n   */\n  static readTimeIndex = 'readTimeIndex';\n\n  static readTimeIndexPath = 'readTime';\n\n  /**\n   * An index that provides access to documents in a collection sorted by read\n   * time.\n   *\n   * This index is used to allow the RemoteDocumentCache to fetch newly changed\n   * documents in a collection.\n   */\n  static collectionReadTimeIndex = 'collectionReadTimeIndex';\n\n  static collectionReadTimeIndexPath = ['parentPath', 'readTime'];\n\n  // TODO: We are currently storing full document keys almost three times\n  // (once as part of the primary key, once - partly - as `parentPath` and once\n  // inside the encoded documents). During our next migration, we should\n  // rewrite the primary key as parentPath + document ID which would allow us\n  // to drop one value.\n\n  constructor(\n    /**\n     * Set to an instance of DbUnknownDocument if the data for a document is\n     * not known, but it is known that a document exists at the specified\n     * version (e.g. it had a successful update applied to it)\n     */\n    public unknownDocument: DbUnknownDocument | null | undefined,\n    /**\n     * Set to an instance of a DbNoDocument if it is known that no document\n     * exists.\n     */\n    public noDocument: DbNoDocument | null,\n    /**\n     * Set to an instance of a Document if there's a cached version of the\n     * document.\n     */\n    public document: api.Document | null,\n    /**\n     * Documents that were written to the remote document store based on\n     * a write acknowledgment are marked with `hasCommittedMutations`. These\n     * documents are potentially inconsistent with the backend's copy and use\n     * the write's commit version as their document version.\n     */\n    public hasCommittedMutations: boolean | undefined,\n\n    /**\n     * When the document was read from the backend. Undefined for data written\n     * prior to schema version 9.\n     */\n    public readTime: DbTimestampKey | undefined,\n\n    /**\n     * The path of the collection this document is part of. Undefined for data\n     * written prior to schema version 9.\n     */\n    public parentPath: string[] | undefined\n  ) {}\n}\n\n/**\n * Contains a single entry that has metadata about the remote document cache.\n */\nexport class DbRemoteDocumentGlobal {\n  static store = 'remoteDocumentGlobal';\n\n  static key = 'remoteDocumentGlobalKey';\n\n  /**\n   * @param byteSize Approximately the total size in bytes of all the documents in the document\n   * cache.\n   */\n  constructor(public byteSize: number) {}\n}\n\nexport type DbRemoteDocumentGlobalKey = typeof DbRemoteDocumentGlobal.key;\n\nfunction createDocumentGlobalStore(db: IDBDatabase): void {\n  db.createObjectStore(DbRemoteDocumentGlobal.store);\n}\n\n/**\n * A key in the 'targets' object store is a targetId of the query.\n */\nexport type DbTargetKey = TargetId;\n\n/**\n * The persisted type for a query nested with in the 'targets' store in\n * IndexedDb. We use the proto definitions for these two kinds of queries in\n * order to avoid writing extra serialization logic.\n */\nexport type DbQuery = api.QueryTarget | api.DocumentsTarget;\n\n/**\n * An object to be stored in the 'targets' store in IndexedDb.\n *\n * This is based on and should be kept in sync with the proto used in the iOS\n * client.\n *\n * Each query the client listens to against the server is tracked on disk so\n * that the query can be efficiently resumed on restart.\n */\nexport class DbTarget {\n  static store = 'targets';\n\n  /** Keys are automatically assigned via the targetId property. */\n  static keyPath = 'targetId';\n\n  /** The name of the queryTargets index. */\n  static queryTargetsIndexName = 'queryTargetsIndex';\n\n  /**\n   * The index of all canonicalIds to the targets that they match. This is not\n   * a unique mapping because canonicalId does not promise a unique name for all\n   * possible queries, so we append the targetId to make the mapping unique.\n   */\n  static queryTargetsKeyPath = ['canonicalId', 'targetId'];\n\n  constructor(\n    /**\n     * An auto-generated sequential numeric identifier for the query.\n     *\n     * Queries are stored using their canonicalId as the key, but these\n     * canonicalIds can be quite long so we additionally assign a unique\n     * queryId which can be used by referenced data structures (e.g.\n     * indexes) to minimize the on-disk cost.\n     */\n    public targetId: TargetId,\n    /**\n     * The canonical string representing this query. This is not unique.\n     */\n    public canonicalId: string,\n    /**\n     * The last readTime received from the Watch Service for this query.\n     *\n     * This is the same value as TargetChange.read_time in the protos.\n     */\n    public readTime: DbTimestamp,\n    /**\n     * An opaque, server-assigned token that allows watching a query to be\n     * resumed after disconnecting without retransmitting all the data\n     * that matches the query. The resume token essentially identifies a\n     * point in time from which the server should resume sending results.\n     *\n     * This is related to the snapshotVersion in that the resumeToken\n     * effectively also encodes that value, but the resumeToken is opaque\n     * and sometimes encodes additional information.\n     *\n     * A consequence of this is that the resumeToken should be used when\n     * asking the server to reason about where this client is in the watch\n     * stream, but the client should use the snapshotVersion for its own\n     * purposes.\n     *\n     * This is the same value as TargetChange.resume_token in the protos.\n     */\n    public resumeToken: string,\n    /**\n     * A sequence number representing the last time this query was\n     * listened to, used for garbage collection purposes.\n     *\n     * Conventionally this would be a timestamp value, but device-local\n     * clocks are unreliable and they must be able to create new listens\n     * even while disconnected. Instead this should be a monotonically\n     * increasing number that's incremented on each listen call.\n     *\n     * This is different from the queryId since the queryId is an\n     * immutable identifier assigned to the Query on first use while\n     * lastListenSequenceNumber is updated every time the query is\n     * listened to.\n     */\n    public lastListenSequenceNumber: number,\n    /**\n     * Denotes the maximum snapshot version at which the associated query view\n     * contained no limbo documents.  Undefined for data written prior to\n     * schema version 9.\n     */\n    public lastLimboFreeSnapshotVersion: DbTimestamp | undefined,\n    /**\n     * The query for this target.\n     *\n     * Because canonical ids are not unique we must store the actual query. We\n     * use the proto to have an object we can persist without having to\n     * duplicate translation logic to and from a `Query` object.\n     */\n    public query: DbQuery\n  ) {}\n}\n\n/**\n * The key for a DbTargetDocument, containing a targetId and an encoded resource\n * path.\n */\nexport type DbTargetDocumentKey = [TargetId, EncodedResourcePath];\n\n/**\n * An object representing an association between a target and a document, or a\n * sentinel row marking the last sequence number at which a document was used.\n * Each document cached must have a corresponding sentinel row before lru\n * garbage collection is enabled.\n *\n * The target associations and sentinel rows are co-located so that orphaned\n * documents and their sequence numbers can be identified efficiently via a scan\n * of this store.\n */\nexport class DbTargetDocument {\n  /** Name of the IndexedDb object store.  */\n  static store = 'targetDocuments';\n\n  /** Keys are automatically assigned via the targetId, path properties. */\n  static keyPath = ['targetId', 'path'];\n\n  /** The index name for the reverse index. */\n  static documentTargetsIndex = 'documentTargetsIndex';\n\n  /** We also need to create the reverse index for these properties. */\n  static documentTargetsKeyPath = ['path', 'targetId'];\n\n  constructor(\n    /**\n     * The targetId identifying a target or 0 for a sentinel row.\n     */\n    public targetId: TargetId,\n    /**\n     * The path to the document, as encoded in the key.\n     */\n    public path: EncodedResourcePath,\n    /**\n     * If this is a sentinel row, this should be the sequence number of the last\n     * time the document specified by `path` was used. Otherwise, it should be\n     * `undefined`.\n     */\n    public sequenceNumber?: ListenSequenceNumber\n  ) {\n    debugAssert(\n      (targetId === 0) === (sequenceNumber !== undefined),\n      'A target-document row must either have targetId == 0 and a defined sequence number, or a non-zero targetId and no sequence number'\n    );\n  }\n}\n\n/**\n * The type to represent the single allowed key for the DbTargetGlobal store.\n */\nexport type DbTargetGlobalKey = typeof DbTargetGlobal.key;\n\n/**\n * A record of global state tracked across all Targets, tracked separately\n * to avoid the need for extra indexes.\n *\n * This should be kept in-sync with the proto used in the iOS client.\n */\nexport class DbTargetGlobal {\n  /**\n   * The key string used for the single object that exists in the\n   * DbTargetGlobal store.\n   */\n  static key = 'targetGlobalKey';\n  static store = 'targetGlobal';\n\n  constructor(\n    /**\n     * The highest numbered target id across all targets.\n     *\n     * See DbTarget.targetId.\n     */\n    public highestTargetId: TargetId,\n    /**\n     * The highest numbered lastListenSequenceNumber across all targets.\n     *\n     * See DbTarget.lastListenSequenceNumber.\n     */\n    public highestListenSequenceNumber: number,\n    /**\n     * A global snapshot version representing the last consistent snapshot we\n     * received from the backend. This is monotonically increasing and any\n     * snapshots received from the backend prior to this version (e.g. for\n     * targets resumed with a resumeToken) should be suppressed (buffered)\n     * until the backend has caught up to this snapshot version again. This\n     * prevents our cache from ever going backwards in time.\n     */\n    public lastRemoteSnapshotVersion: DbTimestamp,\n    /**\n     * The number of targets persisted.\n     */\n    public targetCount: number\n  ) {}\n}\n\n/**\n * The key for a DbCollectionParent entry, containing the collection ID\n * and the parent path that contains it. Note that the parent path will be an\n * empty path in the case of root-level collections.\n */\nexport type DbCollectionParentKey = [string, EncodedResourcePath];\n\n/**\n * An object representing an association between a Collection id (e.g. 'messages')\n * to a parent path (e.g. '/chats/123') that contains it as a (sub)collection.\n * This is used to efficiently find all collections to query when performing\n * a Collection Group query.\n */\nexport class DbCollectionParent {\n  /** Name of the IndexedDb object store. */\n  static store = 'collectionParents';\n\n  /** Keys are automatically assigned via the collectionId, parent properties. */\n  static keyPath = ['collectionId', 'parent'];\n\n  constructor(\n    /**\n     * The collectionId (e.g. 'messages')\n     */\n    public collectionId: string,\n    /**\n     * The path to the parent (either a document location or an empty path for\n     * a root-level collection).\n     */\n    public parent: EncodedResourcePath\n  ) {}\n}\n\nfunction createQueryCache(db: IDBDatabase): void {\n  const targetDocumentsStore = db.createObjectStore(DbTargetDocument.store, {\n    keyPath: DbTargetDocument.keyPath\n  });\n  targetDocumentsStore.createIndex(\n    DbTargetDocument.documentTargetsIndex,\n    DbTargetDocument.documentTargetsKeyPath,\n    { unique: true }\n  );\n\n  const targetStore = db.createObjectStore(DbTarget.store, {\n    keyPath: DbTarget.keyPath\n  });\n\n  // NOTE: This is unique only because the TargetId is the suffix.\n  targetStore.createIndex(\n    DbTarget.queryTargetsIndexName,\n    DbTarget.queryTargetsKeyPath,\n    { unique: true }\n  );\n  db.createObjectStore(DbTargetGlobal.store);\n}\n\nfunction dropQueryCache(db: IDBDatabase): void {\n  db.deleteObjectStore(DbTargetDocument.store);\n  db.deleteObjectStore(DbTarget.store);\n  db.deleteObjectStore(DbTargetGlobal.store);\n}\n\nfunction dropRemoteDocumentChangesStore(db: IDBDatabase): void {\n  if (db.objectStoreNames.contains('remoteDocumentChanges')) {\n    db.deleteObjectStore('remoteDocumentChanges');\n  }\n}\n\n/**\n * Creates the target global singleton row.\n *\n * @param {IDBTransaction} txn The version upgrade transaction for indexeddb\n */\nfunction writeEmptyTargetGlobalEntry(\n  txn: SimpleDbTransaction\n): PersistencePromise<void> {\n  const globalStore = txn.store<DbTargetGlobalKey, DbTargetGlobal>(\n    DbTargetGlobal.store\n  );\n  const metadata = new DbTargetGlobal(\n    /*highestTargetId=*/ 0,\n    /*lastListenSequenceNumber=*/ 0,\n    SnapshotVersion.min().toTimestamp(),\n    /*targetCount=*/ 0\n  );\n  return globalStore.put(DbTargetGlobal.key, metadata);\n}\n\n/**\n * Creates indices on the RemoteDocuments store used for both multi-tab\n * and Index-Free queries.\n */\nfunction createRemoteDocumentReadTimeIndex(txn: IDBTransaction): void {\n  const remoteDocumentStore = txn.objectStore(DbRemoteDocument.store);\n  remoteDocumentStore.createIndex(\n    DbRemoteDocument.readTimeIndex,\n    DbRemoteDocument.readTimeIndexPath,\n    { unique: false }\n  );\n  remoteDocumentStore.createIndex(\n    DbRemoteDocument.collectionReadTimeIndex,\n    DbRemoteDocument.collectionReadTimeIndexPath,\n    { unique: false }\n  );\n}\n\n/**\n * A record of the metadata state of each client.\n *\n * PORTING NOTE: This is used to synchronize multi-tab state and does not need\n * to be ported to iOS or Android.\n */\nexport class DbClientMetadata {\n  /** Name of the IndexedDb object store. */\n  static store = 'clientMetadata';\n\n  /** Keys are automatically assigned via the clientId properties. */\n  static keyPath = 'clientId';\n\n  constructor(\n    // Note: Previous schema versions included a field\n    // \"lastProcessedDocumentChangeId\". Don't use anymore.\n\n    /** The auto-generated client id assigned at client startup. */\n    public clientId: string,\n    /** The last time this state was updated. */\n    public updateTimeMs: number,\n    /** Whether the client's network connection is enabled. */\n    public networkEnabled: boolean,\n    /** Whether this client is running in a foreground tab. */\n    public inForeground: boolean\n  ) {}\n}\n\n/** Object keys in the 'clientMetadata' store are clientId strings. */\nexport type DbClientMetadataKey = string;\n\nfunction createClientMetadataStore(db: IDBDatabase): void {\n  db.createObjectStore(DbClientMetadata.store, {\n    keyPath: DbClientMetadata.keyPath\n  });\n}\n\n// Visible for testing\nexport const V1_STORES = [\n  DbMutationQueue.store,\n  DbMutationBatch.store,\n  DbDocumentMutation.store,\n  DbRemoteDocument.store,\n  DbTarget.store,\n  DbPrimaryClient.store,\n  DbTargetGlobal.store,\n  DbTargetDocument.store\n];\n\n// V2 is no longer usable (see comment at top of file)\n\n// Visible for testing\nexport const V3_STORES = V1_STORES;\n\n// Visible for testing\n// Note: DbRemoteDocumentChanges is no longer used and dropped with v9.\nexport const V4_STORES = [...V3_STORES, DbClientMetadata.store];\n\n// V5 does not change the set of stores.\n\nexport const V6_STORES = [...V4_STORES, DbRemoteDocumentGlobal.store];\n\n// V7 does not change the set of stores.\n\nexport const V8_STORES = [...V6_STORES, DbCollectionParent.store];\n\n// V9 does not change the set of stores.\n\n// V10 does not change the set of stores.\n\n/**\n * The list of all default IndexedDB stores used throughout the SDK. This is\n * used when creating transactions so that access across all stores is done\n * atomically.\n */\nexport const ALL_STORES = V8_STORES;\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { getUA } from '@firebase/util';\nimport { debugAssert } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { logDebug, logError } from '../util/log';\nimport { Deferred } from '../util/promise';\nimport { SCHEMA_VERSION } from './indexeddb_schema';\nimport { PersistencePromise } from './persistence_promise';\n\n// References to `window` are guarded by SimpleDb.isAvailable()\n/* eslint-disable no-restricted-globals */\n\nconst LOG_TAG = 'SimpleDb';\n\n/**\n * The maximum number of retry attempts for an IndexedDb transaction that fails\n * with a DOMException.\n */\nconst TRANSACTION_RETRY_COUNT = 3;\n\n// The different modes supported by `SimpleDb.runTransaction()`\ntype SimpleDbTransactionMode = 'readonly' | 'readwrite';\n\nexport interface SimpleDbSchemaConverter {\n  createOrUpgrade(\n    db: IDBDatabase,\n    txn: IDBTransaction,\n    fromVersion: number,\n    toVersion: number\n  ): PersistencePromise<void>;\n}\n\n/**\n * Provides a wrapper around IndexedDb with a simplified interface that uses\n * Promise-like return values to chain operations. Real promises cannot be used\n * since .then() continuations are executed asynchronously (e.g. via\n * .setImmediate), which would cause IndexedDB to end the transaction.\n * See PersistencePromise for more details.\n */\nexport class SimpleDb {\n  /**\n   * Opens the specified database, creating or upgrading it if necessary.\n   *\n   * Note that `version` must not be a downgrade. IndexedDB does not support downgrading the schema\n   * version. We currently do not support any way to do versioning outside of IndexedDB's versioning\n   * mechanism, as only version-upgrade transactions are allowed to do things like create\n   * objectstores.\n   */\n  static openOrCreate(\n    name: string,\n    version: number,\n    schemaConverter: SimpleDbSchemaConverter\n  ): Promise<SimpleDb> {\n    debugAssert(\n      SimpleDb.isAvailable(),\n      'IndexedDB not supported in current environment.'\n    );\n    logDebug(LOG_TAG, 'Opening database:', name);\n    return new PersistencePromise<SimpleDb>((resolve, reject) => {\n      // TODO(mikelehen): Investigate browser compatibility.\n      // https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API/Using_IndexedDB\n      // suggests IE9 and older WebKit browsers handle upgrade\n      // differently. They expect setVersion, as described here:\n      // https://developer.mozilla.org/en-US/docs/Web/API/IDBVersionChangeRequest/setVersion\n      const request = window.indexedDB.open(name, version);\n\n      request.onsuccess = (event: Event) => {\n        const db = (event.target as IDBOpenDBRequest).result;\n        resolve(new SimpleDb(db));\n      };\n\n      request.onblocked = () => {\n        reject(\n          new FirestoreError(\n            Code.FAILED_PRECONDITION,\n            'Cannot upgrade IndexedDB schema while another tab is open. ' +\n              'Close all tabs that access Firestore and reload this page to proceed.'\n          )\n        );\n      };\n\n      request.onerror = (event: Event) => {\n        const error: DOMException = (event.target as IDBOpenDBRequest).error!;\n        if (error.name === 'VersionError') {\n          reject(\n            new FirestoreError(\n              Code.FAILED_PRECONDITION,\n              'A newer version of the Firestore SDK was previously used and so the persisted ' +\n                'data is not compatible with the version of the SDK you are now using. The SDK ' +\n                'will operate with persistence disabled. If you need persistence, please ' +\n                're-upgrade to a newer version of the SDK or else clear the persisted IndexedDB ' +\n                'data for your app to start fresh.'\n            )\n          );\n        } else {\n          reject(error);\n        }\n      };\n\n      request.onupgradeneeded = (event: IDBVersionChangeEvent) => {\n        logDebug(\n          LOG_TAG,\n          'Database \"' + name + '\" requires upgrade from version:',\n          event.oldVersion\n        );\n        const db = (event.target as IDBOpenDBRequest).result;\n        schemaConverter\n          .createOrUpgrade(\n            db,\n            request.transaction!,\n            event.oldVersion,\n            SCHEMA_VERSION\n          )\n          .next(() => {\n            logDebug(\n              LOG_TAG,\n              'Database upgrade to version ' + SCHEMA_VERSION + ' complete'\n            );\n          });\n      };\n    }).toPromise();\n  }\n\n  /** Deletes the specified database. */\n  static delete(name: string): Promise<void> {\n    logDebug(LOG_TAG, 'Removing database:', name);\n    return wrapRequest<void>(window.indexedDB.deleteDatabase(name)).toPromise();\n  }\n\n  /** Returns true if IndexedDB is available in the current environment. */\n  static isAvailable(): boolean {\n    if (typeof window === 'undefined' || window.indexedDB == null) {\n      return false;\n    }\n\n    if (SimpleDb.isMockPersistence()) {\n      return true;\n    }\n\n    // In some Node environments, `window` is defined, but `window.navigator` is\n    // not. We don't support IndexedDB persistence in Node if the\n    // isMockPersistence() check above returns false.\n    if (window.navigator === undefined) {\n      return false;\n    }\n\n    // We extensively use indexed array values and compound keys,\n    // which IE and Edge do not support. However, they still have indexedDB\n    // defined on the window, so we need to check for them here and make sure\n    // to return that persistence is not enabled for those browsers.\n    // For tracking support of this feature, see here:\n    // https://developer.microsoft.com/en-us/microsoft-edge/platform/status/indexeddbarraysandmultientrysupport/\n\n    // Check the UA string to find out the browser.\n    const ua = getUA();\n\n    // IE 10\n    // ua = 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)';\n\n    // IE 11\n    // ua = 'Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko';\n\n    // Edge\n    // ua = 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML,\n    // like Gecko) Chrome/39.0.2171.71 Safari/537.36 Edge/12.0';\n\n    // iOS Safari: Disable for users running iOS version < 10.\n    const iOSVersion = SimpleDb.getIOSVersion(ua);\n    const isUnsupportedIOS = 0 < iOSVersion && iOSVersion < 10;\n\n    // Android browser: Disable for userse running version < 4.5.\n    const androidVersion = SimpleDb.getAndroidVersion(ua);\n    const isUnsupportedAndroid = 0 < androidVersion && androidVersion < 4.5;\n\n    if (\n      ua.indexOf('MSIE ') > 0 ||\n      ua.indexOf('Trident/') > 0 ||\n      ua.indexOf('Edge/') > 0 ||\n      isUnsupportedIOS ||\n      isUnsupportedAndroid\n    ) {\n      return false;\n    } else {\n      return true;\n    }\n  }\n\n  /**\n   * Returns true if the backing IndexedDB store is the Node IndexedDBShim\n   * (see https://github.com/axemclion/IndexedDBShim).\n   */\n  static isMockPersistence(): boolean {\n    return (\n      typeof process !== 'undefined' &&\n      process.env?.USE_MOCK_PERSISTENCE === 'YES'\n    );\n  }\n\n  /** Helper to get a typed SimpleDbStore from a transaction. */\n  static getStore<KeyType extends IDBValidKey, ValueType extends unknown>(\n    txn: SimpleDbTransaction,\n    store: string\n  ): SimpleDbStore<KeyType, ValueType> {\n    return txn.store<KeyType, ValueType>(store);\n  }\n\n  // visible for testing\n  /** Parse User Agent to determine iOS version. Returns -1 if not found. */\n  static getIOSVersion(ua: string): number {\n    const iOSVersionRegex = ua.match(/i(?:phone|pad|pod) os ([\\d_]+)/i);\n    const version = iOSVersionRegex\n      ? iOSVersionRegex[1]\n          .split('_')\n          .slice(0, 2)\n          .join('.')\n      : '-1';\n    return Number(version);\n  }\n\n  // visible for testing\n  /** Parse User Agent to determine Android version. Returns -1 if not found. */\n  static getAndroidVersion(ua: string): number {\n    const androidVersionRegex = ua.match(/Android ([\\d.]+)/i);\n    const version = androidVersionRegex\n      ? androidVersionRegex[1]\n          .split('.')\n          .slice(0, 2)\n          .join('.')\n      : '-1';\n    return Number(version);\n  }\n\n  constructor(private db: IDBDatabase) {\n    const iOSVersion = SimpleDb.getIOSVersion(getUA());\n    // NOTE: According to https://bugs.webkit.org/show_bug.cgi?id=197050, the\n    // bug we're checking for should exist in iOS >= 12.2 and < 13, but for\n    // whatever reason it's much harder to hit after 12.2 so we only proactively\n    // log on 12.2.\n    if (iOSVersion === 12.2) {\n      logError(\n        'Firestore persistence suffers from a bug in iOS 12.2 ' +\n          'Safari that may cause your app to stop working. See ' +\n          'https://stackoverflow.com/q/56496296/110915 for details ' +\n          'and a potential workaround.'\n      );\n    }\n  }\n\n  setVersionChangeListener(\n    versionChangeListener: (event: IDBVersionChangeEvent) => void\n  ): void {\n    this.db.onversionchange = (event: IDBVersionChangeEvent) => {\n      return versionChangeListener(event);\n    };\n  }\n\n  async runTransaction<T>(\n    mode: SimpleDbTransactionMode,\n    objectStores: string[],\n    transactionFn: (transaction: SimpleDbTransaction) => PersistencePromise<T>\n  ): Promise<T> {\n    const readonly = mode === 'readonly';\n    let attemptNumber = 0;\n\n    while (true) {\n      ++attemptNumber;\n\n      const transaction = SimpleDbTransaction.open(\n        this.db,\n        readonly ? 'readonly' : 'readwrite',\n        objectStores\n      );\n      try {\n        const transactionFnResult = transactionFn(transaction)\n          .catch(error => {\n            // Abort the transaction if there was an error.\n            transaction.abort(error);\n            // We cannot actually recover, and calling `abort()` will cause the transaction's\n            // completion promise to be rejected. This in turn means that we won't use\n            // `transactionFnResult` below. We return a rejection here so that we don't add the\n            // possibility of returning `void` to the type of `transactionFnResult`.\n            return PersistencePromise.reject<T>(error);\n          })\n          .toPromise();\n\n        // As noted above, errors are propagated by aborting the transaction. So\n        // we swallow any error here to avoid the browser logging it as unhandled.\n        transactionFnResult.catch(() => {});\n\n        // Wait for the transaction to complete (i.e. IndexedDb's onsuccess event to\n        // fire), but still return the original transactionFnResult back to the\n        // caller.\n        await transaction.completionPromise;\n        return transactionFnResult;\n      } catch (error) {\n        // TODO(schmidt-sebastian): We could probably be smarter about this and\n        // not retry exceptions that are likely unrecoverable (such as quota\n        // exceeded errors).\n\n        // Note: We cannot use an instanceof check for FirestoreException, since the\n        // exception is wrapped in a generic error by our async/await handling.\n        const retryable =\n          error.name !== 'FirebaseError' &&\n          attemptNumber < TRANSACTION_RETRY_COUNT;\n        logDebug(\n          LOG_TAG,\n          'Transaction failed with error: %s. Retrying: %s.',\n          error.message,\n          retryable\n        );\n\n        if (!retryable) {\n          return Promise.reject(error);\n        }\n      }\n    }\n  }\n\n  close(): void {\n    this.db.close();\n  }\n}\n\n/**\n * A controller for iterating over a key range or index. It allows an iterate\n * callback to delete the currently-referenced object, or jump to a new key\n * within the key range or index.\n */\nexport class IterationController {\n  private shouldStop = false;\n  private nextKey: IDBValidKey | null = null;\n\n  constructor(private dbCursor: IDBCursorWithValue) {}\n\n  get isDone(): boolean {\n    return this.shouldStop;\n  }\n\n  get skipToKey(): IDBValidKey | null {\n    return this.nextKey;\n  }\n\n  set cursor(value: IDBCursorWithValue) {\n    this.dbCursor = value;\n  }\n\n  /**\n   * This function can be called to stop iteration at any point.\n   */\n  done(): void {\n    this.shouldStop = true;\n  }\n\n  /**\n   * This function can be called to skip to that next key, which could be\n   * an index or a primary key.\n   */\n  skip(key: IDBValidKey): void {\n    this.nextKey = key;\n  }\n\n  /**\n   * Delete the current cursor value from the object store.\n   *\n   * NOTE: You CANNOT do this with a keysOnly query.\n   */\n  delete(): PersistencePromise<void> {\n    return wrapRequest<void>(this.dbCursor.delete());\n  }\n}\n\n/**\n * Callback used with iterate() method.\n */\nexport type IterateCallback<KeyType, ValueType> = (\n  key: KeyType,\n  value: ValueType,\n  control: IterationController\n) => void | PersistencePromise<void>;\n\n/** Options available to the iterate() method. */\nexport interface IterateOptions {\n  /** Index to iterate over (else primary keys will be iterated) */\n  index?: string;\n\n  /** IndxedDB Range to iterate over (else entire store will be iterated) */\n  range?: IDBKeyRange;\n\n  /** If true, values aren't read while iterating. */\n  keysOnly?: boolean;\n\n  /** If true, iterate over the store in reverse. */\n  reverse?: boolean;\n}\n\n/** An error that wraps exceptions that thrown during IndexedDB execution. */\nexport class IndexedDbTransactionError extends FirestoreError {\n  name = 'IndexedDbTransactionError';\n\n  constructor(cause: Error) {\n    super(Code.UNAVAILABLE, 'IndexedDB transaction failed: ' + cause);\n  }\n}\n\n/** Verifies whether `e` is an IndexedDbTransactionError. */\nexport function isIndexedDbTransactionError(e: Error): boolean {\n  // Use name equality, as instanceof checks on errors don't work with errors\n  // that wrap other errors.\n  return e.name === 'IndexedDbTransactionError';\n}\n\n/**\n * Wraps an IDBTransaction and exposes a store() method to get a handle to a\n * specific object store.\n */\nexport class SimpleDbTransaction {\n  private aborted = false;\n\n  /**\n   * A promise that resolves with the result of the IndexedDb transaction.\n   */\n  private readonly completionDeferred = new Deferred<void>();\n\n  static open(\n    db: IDBDatabase,\n    mode: IDBTransactionMode,\n    objectStoreNames: string[]\n  ): SimpleDbTransaction {\n    return new SimpleDbTransaction(db.transaction(objectStoreNames, mode));\n  }\n\n  constructor(private readonly transaction: IDBTransaction) {\n    this.transaction.oncomplete = () => {\n      this.completionDeferred.resolve();\n    };\n    this.transaction.onabort = () => {\n      if (transaction.error) {\n        this.completionDeferred.reject(\n          new IndexedDbTransactionError(transaction.error)\n        );\n      } else {\n        this.completionDeferred.resolve();\n      }\n    };\n    this.transaction.onerror = (event: Event) => {\n      const error = checkForAndReportiOSError(\n        (event.target as IDBRequest).error!\n      );\n      this.completionDeferred.reject(new IndexedDbTransactionError(error));\n    };\n  }\n\n  get completionPromise(): Promise<void> {\n    return this.completionDeferred.promise;\n  }\n\n  abort(error?: Error): void {\n    if (error) {\n      this.completionDeferred.reject(error);\n    }\n\n    if (!this.aborted) {\n      logDebug(\n        LOG_TAG,\n        'Aborting transaction:',\n        error ? error.message : 'Client-initiated abort'\n      );\n      this.aborted = true;\n      this.transaction.abort();\n    }\n  }\n\n  /**\n   * Returns a SimpleDbStore<KeyType, ValueType> for the specified store. All\n   * operations performed on the SimpleDbStore happen within the context of this\n   * transaction and it cannot be used anymore once the transaction is\n   * completed.\n   *\n   * Note that we can't actually enforce that the KeyType and ValueType are\n   * correct, but they allow type safety through the rest of the consuming code.\n   */\n  store<KeyType extends IDBValidKey, ValueType extends unknown>(\n    storeName: string\n  ): SimpleDbStore<KeyType, ValueType> {\n    const store = this.transaction.objectStore(storeName);\n    debugAssert(!!store, 'Object store not part of transaction: ' + storeName);\n    return new SimpleDbStore<KeyType, ValueType>(store);\n  }\n}\n\n/**\n * A wrapper around an IDBObjectStore providing an API that:\n *\n * 1) Has generic KeyType / ValueType parameters to provide strongly-typed\n * methods for acting against the object store.\n * 2) Deals with IndexedDB's onsuccess / onerror event callbacks, making every\n * method return a PersistencePromise instead.\n * 3) Provides a higher-level API to avoid needing to do excessive wrapping of\n * intermediate IndexedDB types (IDBCursorWithValue, etc.)\n */\nexport class SimpleDbStore<\n  KeyType extends IDBValidKey,\n  ValueType extends unknown\n> {\n  constructor(private store: IDBObjectStore) {}\n\n  /**\n   * Writes a value into the Object Store.\n   *\n   * @param key Optional explicit key to use when writing the object, else the\n   * key will be auto-assigned (e.g. via the defined keyPath for the store).\n   * @param value The object to write.\n   */\n  put(value: ValueType): PersistencePromise<void>;\n  put(key: KeyType, value: ValueType): PersistencePromise<void>;\n  put(\n    keyOrValue: KeyType | ValueType,\n    value?: ValueType\n  ): PersistencePromise<void> {\n    let request;\n    if (value !== undefined) {\n      logDebug(LOG_TAG, 'PUT', this.store.name, keyOrValue, value);\n      request = this.store.put(value, keyOrValue as KeyType);\n    } else {\n      logDebug(LOG_TAG, 'PUT', this.store.name, '<auto-key>', keyOrValue);\n      request = this.store.put(keyOrValue as ValueType);\n    }\n    return wrapRequest<void>(request);\n  }\n\n  /**\n   * Adds a new value into an Object Store and returns the new key. Similar to\n   * IndexedDb's `add()`, this method will fail on primary key collisions.\n   *\n   * @param value The object to write.\n   * @return The key of the value to add.\n   */\n  add(value: ValueType): PersistencePromise<KeyType> {\n    logDebug(LOG_TAG, 'ADD', this.store.name, value, value);\n    const request = this.store.add(value as ValueType);\n    return wrapRequest<KeyType>(request);\n  }\n\n  /**\n   * Gets the object with the specified key from the specified store, or null\n   * if no object exists with the specified key.\n   *\n   * @key The key of the object to get.\n   * @return The object with the specified key or null if no object exists.\n   */\n  get(key: KeyType): PersistencePromise<ValueType | null> {\n    const request = this.store.get(key);\n    // We're doing an unsafe cast to ValueType.\n    // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    return wrapRequest<any>(request).next(result => {\n      // Normalize nonexistence to null.\n      if (result === undefined) {\n        result = null;\n      }\n      logDebug(LOG_TAG, 'GET', this.store.name, key, result);\n      return result;\n    });\n  }\n\n  delete(key: KeyType | IDBKeyRange): PersistencePromise<void> {\n    logDebug(LOG_TAG, 'DELETE', this.store.name, key);\n    const request = this.store.delete(key);\n    return wrapRequest<void>(request);\n  }\n\n  /**\n   * If we ever need more of the count variants, we can add overloads. For now,\n   * all we need is to count everything in a store.\n   *\n   * Returns the number of rows in the store.\n   */\n  count(): PersistencePromise<number> {\n    logDebug(LOG_TAG, 'COUNT', this.store.name);\n    const request = this.store.count();\n    return wrapRequest<number>(request);\n  }\n\n  loadAll(): PersistencePromise<ValueType[]>;\n  loadAll(range: IDBKeyRange): PersistencePromise<ValueType[]>;\n  loadAll(index: string, range: IDBKeyRange): PersistencePromise<ValueType[]>;\n  loadAll(\n    indexOrRange?: string | IDBKeyRange,\n    range?: IDBKeyRange\n  ): PersistencePromise<ValueType[]> {\n    const cursor = this.cursor(this.options(indexOrRange, range));\n    const results: ValueType[] = [];\n    return this.iterateCursor(cursor, (key, value) => {\n      results.push(value);\n    }).next(() => {\n      return results;\n    });\n  }\n\n  deleteAll(): PersistencePromise<void>;\n  deleteAll(range: IDBKeyRange): PersistencePromise<void>;\n  deleteAll(index: string, range: IDBKeyRange): PersistencePromise<void>;\n  deleteAll(\n    indexOrRange?: string | IDBKeyRange,\n    range?: IDBKeyRange\n  ): PersistencePromise<void> {\n    logDebug(LOG_TAG, 'DELETE ALL', this.store.name);\n    const options = this.options(indexOrRange, range);\n    options.keysOnly = false;\n    const cursor = this.cursor(options);\n    return this.iterateCursor(cursor, (key, value, control) => {\n      // NOTE: Calling delete() on a cursor is documented as more efficient than\n      // calling delete() on an object store with a single key\n      // (https://developer.mozilla.org/en-US/docs/Web/API/IDBObjectStore/delete),\n      // however, this requires us *not* to use a keysOnly cursor\n      // (https://developer.mozilla.org/en-US/docs/Web/API/IDBCursor/delete). We\n      // may want to compare the performance of each method.\n      return control.delete();\n    });\n  }\n\n  /**\n   * Iterates over keys and values in an object store.\n   *\n   * @param options Options specifying how to iterate the objects in the store.\n   * @param callback will be called for each iterated object. Iteration can be\n   * canceled at any point by calling the doneFn passed to the callback.\n   * The callback can return a PersistencePromise if it performs async\n   * operations but note that iteration will continue without waiting for them\n   * to complete.\n   * @returns A PersistencePromise that resolves once all PersistencePromises\n   * returned by callbacks resolve.\n   */\n  iterate(\n    callback: IterateCallback<KeyType, ValueType>\n  ): PersistencePromise<void>;\n  iterate(\n    options: IterateOptions,\n    callback: IterateCallback<KeyType, ValueType>\n  ): PersistencePromise<void>;\n  iterate(\n    optionsOrCallback: IterateOptions | IterateCallback<KeyType, ValueType>,\n    callback?: IterateCallback<KeyType, ValueType>\n  ): PersistencePromise<void> {\n    let options;\n    if (!callback) {\n      options = {};\n      callback = optionsOrCallback as IterateCallback<KeyType, ValueType>;\n    } else {\n      options = optionsOrCallback as IterateOptions;\n    }\n    const cursor = this.cursor(options);\n    return this.iterateCursor(cursor, callback);\n  }\n\n  /**\n   * Iterates over a store, but waits for the given callback to complete for\n   * each entry before iterating the next entry. This allows the callback to do\n   * asynchronous work to determine if this iteration should continue.\n   *\n   * The provided callback should return `true` to continue iteration, and\n   * `false` otherwise.\n   */\n  iterateSerial(\n    callback: (k: KeyType, v: ValueType) => PersistencePromise<boolean>\n  ): PersistencePromise<void> {\n    const cursorRequest = this.cursor({});\n    return new PersistencePromise((resolve, reject) => {\n      cursorRequest.onerror = (event: Event) => {\n        const error = checkForAndReportiOSError(\n          (event.target as IDBRequest).error!\n        );\n        reject(error);\n      };\n      cursorRequest.onsuccess = (event: Event) => {\n        const cursor: IDBCursorWithValue = (event.target as IDBRequest).result;\n        if (!cursor) {\n          resolve();\n          return;\n        }\n\n        callback(cursor.primaryKey as KeyType, cursor.value).next(\n          shouldContinue => {\n            if (shouldContinue) {\n              cursor.continue();\n            } else {\n              resolve();\n            }\n          }\n        );\n      };\n    });\n  }\n\n  private iterateCursor(\n    cursorRequest: IDBRequest,\n    fn: IterateCallback<KeyType, ValueType>\n  ): PersistencePromise<void> {\n    const results: Array<PersistencePromise<void>> = [];\n    return new PersistencePromise((resolve, reject) => {\n      cursorRequest.onerror = (event: Event) => {\n        reject((event.target as IDBRequest).error!);\n      };\n      cursorRequest.onsuccess = (event: Event) => {\n        const cursor: IDBCursorWithValue = (event.target as IDBRequest).result;\n        if (!cursor) {\n          resolve();\n          return;\n        }\n        const controller = new IterationController(cursor);\n        const userResult = fn(\n          cursor.primaryKey as KeyType,\n          cursor.value,\n          controller\n        );\n        if (userResult instanceof PersistencePromise) {\n          const userPromise: PersistencePromise<void> = userResult.catch(\n            err => {\n              controller.done();\n              return PersistencePromise.reject(err);\n            }\n          );\n          results.push(userPromise);\n        }\n        if (controller.isDone) {\n          resolve();\n        } else if (controller.skipToKey === null) {\n          cursor.continue();\n        } else {\n          cursor.continue(controller.skipToKey);\n        }\n      };\n    }).next(() => {\n      return PersistencePromise.waitFor(results);\n    });\n  }\n\n  private options(\n    indexOrRange?: string | IDBKeyRange,\n    range?: IDBKeyRange\n  ): IterateOptions {\n    let indexName: string | undefined = undefined;\n    if (indexOrRange !== undefined) {\n      if (typeof indexOrRange === 'string') {\n        indexName = indexOrRange;\n      } else {\n        debugAssert(\n          range === undefined,\n          '3rd argument must not be defined if 2nd is a range.'\n        );\n        range = indexOrRange;\n      }\n    }\n    return { index: indexName, range };\n  }\n\n  private cursor(options: IterateOptions): IDBRequest {\n    let direction: IDBCursorDirection = 'next';\n    if (options.reverse) {\n      direction = 'prev';\n    }\n    if (options.index) {\n      const index = this.store.index(options.index);\n      if (options.keysOnly) {\n        return index.openKeyCursor(options.range, direction);\n      } else {\n        return index.openCursor(options.range, direction);\n      }\n    } else {\n      return this.store.openCursor(options.range, direction);\n    }\n  }\n}\n\n/**\n * Wraps an IDBRequest in a PersistencePromise, using the onsuccess / onerror\n * handlers to resolve / reject the PersistencePromise as appropriate.\n */\nfunction wrapRequest<R>(request: IDBRequest): PersistencePromise<R> {\n  return new PersistencePromise<R>((resolve, reject) => {\n    request.onsuccess = (event: Event) => {\n      const result = (event.target as IDBRequest).result;\n      resolve(result);\n    };\n\n    request.onerror = (event: Event) => {\n      const error = checkForAndReportiOSError(\n        (event.target as IDBRequest).error!\n      );\n      reject(error);\n    };\n  });\n}\n\n// Guard so we only report the error once.\nlet reportedIOSError = false;\nfunction checkForAndReportiOSError(error: DOMException): Error {\n  const iOSVersion = SimpleDb.getIOSVersion(getUA());\n  if (iOSVersion >= 12.2 && iOSVersion < 13) {\n    const IOS_ERROR =\n      'An internal error was encountered in the Indexed Database server';\n    if (error.message.indexOf(IOS_ERROR) >= 0) {\n      // Wrap error in a more descriptive one.\n      const newError = new FirestoreError(\n        'internal',\n        `IOS_INDEXEDDB_BUG1: IndexedDb has thrown '${IOS_ERROR}'. This is likely ` +\n          `due to an unavoidable bug in iOS. See https://stackoverflow.com/q/56496296/110915 ` +\n          `for details and a potential workaround.`\n      );\n      if (!reportedIOSError) {\n        reportedIOSError = true;\n        // Throw a global exception outside of this promise chain, for the user to\n        // potentially catch.\n        setTimeout(() => {\n          throw newError;\n        }, 0);\n      }\n      return newError;\n    }\n  }\n  return error;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert, fail } from './assert';\nimport { Code, FirestoreError } from './error';\nimport { logDebug, logError } from './log';\nimport { Deferred } from './promise';\nimport { ExponentialBackoff } from '../remote/backoff';\nimport { PlatformSupport } from '../platform/platform';\nimport { isIndexedDbTransactionError } from '../local/simple_db';\n\nconst LOG_TAG = 'AsyncQueue';\n\n// Accept any return type from setTimeout().\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\ntype TimerHandle = any;\n\n/**\n * Wellknown \"timer\" IDs used when scheduling delayed operations on the\n * AsyncQueue. These IDs can then be used from tests to check for the presence\n * of operations or to run them early.\n *\n * The string values are used when encoding these timer IDs in JSON spec tests.\n */\nexport const enum TimerId {\n  /** All can be used with runDelayedOperationsEarly() to run all timers. */\n  All = 'all',\n\n  /**\n   * The following 4 timers are used in persistent_stream.ts for the listen and\n   * write streams. The \"Idle\" timer is used to close the stream due to\n   * inactivity. The \"ConnectionBackoff\" timer is used to restart a stream once\n   * the appropriate backoff delay has elapsed.\n   */\n  ListenStreamIdle = 'listen_stream_idle',\n  ListenStreamConnectionBackoff = 'listen_stream_connection_backoff',\n  WriteStreamIdle = 'write_stream_idle',\n  WriteStreamConnectionBackoff = 'write_stream_connection_backoff',\n\n  /**\n   * A timer used in online_state_tracker.ts to transition from\n   * OnlineState.Unknown to Offline after a set timeout, rather than waiting\n   * indefinitely for success or failure.\n   */\n  OnlineStateTimeout = 'online_state_timeout',\n\n  /**\n   * A timer used to update the client metadata in IndexedDb, which is used\n   * to determine the primary leaseholder.\n   */\n  ClientMetadataRefresh = 'client_metadata_refresh',\n\n  /** A timer used to periodically attempt LRU Garbage collection */\n  LruGarbageCollection = 'lru_garbage_collection',\n\n  /**\n   * A timer used to retry transactions. Since there can be multiple concurrent\n   * transactions, multiple of these may be in the queue at a given time.\n   */\n  TransactionRetry = 'transaction_retry',\n\n  /**\n   * A timer used to retry operations scheduled via retryable AsyncQueue\n   * operations.\n   */\n  AsyncQueueRetry = 'async_queue_retry'\n}\n\n/**\n * Represents an operation scheduled to be run in the future on an AsyncQueue.\n *\n * It is created via DelayedOperation.createAndSchedule().\n *\n * Supports cancellation (via cancel()) and early execution (via skipDelay()).\n *\n * Note: We implement `PromiseLike` instead of `Promise`, as the `Promise` type\n * in newer versions of TypeScript defines `finally`, which is not available in\n * IE.\n */\nexport class DelayedOperation<T extends unknown> implements PromiseLike<T> {\n  // handle for use with clearTimeout(), or null if the operation has been\n  // executed or canceled already.\n  private timerHandle: TimerHandle | null;\n\n  private readonly deferred = new Deferred<T>();\n\n  private constructor(\n    private readonly asyncQueue: AsyncQueue,\n    readonly timerId: TimerId,\n    readonly targetTimeMs: number,\n    private readonly op: () => Promise<T>,\n    private readonly removalCallback: (op: DelayedOperation<T>) => void\n  ) {\n    // It's normal for the deferred promise to be canceled (due to cancellation)\n    // and so we attach a dummy catch callback to avoid\n    // 'UnhandledPromiseRejectionWarning' log spam.\n    this.deferred.promise.catch(err => {});\n  }\n\n  /**\n   * Creates and returns a DelayedOperation that has been scheduled to be\n   * executed on the provided asyncQueue after the provided delayMs.\n   *\n   * @param asyncQueue The queue to schedule the operation on.\n   * @param id A Timer ID identifying the type of operation this is.\n   * @param delayMs The delay (ms) before the operation should be scheduled.\n   * @param op The operation to run.\n   * @param removalCallback A callback to be called synchronously once the\n   *   operation is executed or canceled, notifying the AsyncQueue to remove it\n   *   from its delayedOperations list.\n   *   PORTING NOTE: This exists to prevent making removeDelayedOperation() and\n   *   the DelayedOperation class public.\n   */\n  static createAndSchedule<R extends unknown>(\n    asyncQueue: AsyncQueue,\n    timerId: TimerId,\n    delayMs: number,\n    op: () => Promise<R>,\n    removalCallback: (op: DelayedOperation<R>) => void\n  ): DelayedOperation<R> {\n    const targetTime = Date.now() + delayMs;\n    const delayedOp = new DelayedOperation(\n      asyncQueue,\n      timerId,\n      targetTime,\n      op,\n      removalCallback\n    );\n    delayedOp.start(delayMs);\n    return delayedOp;\n  }\n\n  /**\n   * Starts the timer. This is called immediately after construction by\n   * createAndSchedule().\n   */\n  private start(delayMs: number): void {\n    this.timerHandle = setTimeout(() => this.handleDelayElapsed(), delayMs);\n  }\n\n  /**\n   * Queues the operation to run immediately (if it hasn't already been run or\n   * canceled).\n   */\n  skipDelay(): void {\n    return this.handleDelayElapsed();\n  }\n\n  /**\n   * Cancels the operation if it hasn't already been executed or canceled. The\n   * promise will be rejected.\n   *\n   * As long as the operation has not yet been run, calling cancel() provides a\n   * guarantee that the operation will not be run.\n   */\n  cancel(reason?: string): void {\n    if (this.timerHandle !== null) {\n      this.clearTimeout();\n      this.deferred.reject(\n        new FirestoreError(\n          Code.CANCELLED,\n          'Operation cancelled' + (reason ? ': ' + reason : '')\n        )\n      );\n    }\n  }\n\n  then = this.deferred.promise.then.bind(this.deferred.promise);\n\n  private handleDelayElapsed(): void {\n    this.asyncQueue.enqueueAndForget(() => {\n      if (this.timerHandle !== null) {\n        this.clearTimeout();\n        return this.op().then(result => {\n          return this.deferred.resolve(result);\n        });\n      } else {\n        return Promise.resolve();\n      }\n    });\n  }\n\n  private clearTimeout(): void {\n    if (this.timerHandle !== null) {\n      this.removalCallback(this);\n      clearTimeout(this.timerHandle);\n      this.timerHandle = null;\n    }\n  }\n}\n\nexport class AsyncQueue {\n  // The last promise in the queue.\n  private tail: Promise<unknown> = Promise.resolve();\n\n  // The last retryable operation. Retryable operation are run in order and\n  // retried with backoff.\n  private retryableTail: Promise<void> = Promise.resolve();\n\n  // Is this AsyncQueue being shut down? Once it is set to true, it will not\n  // be changed again.\n  private _isShuttingDown: boolean = false;\n\n  // Operations scheduled to be queued in the future. Operations are\n  // automatically removed after they are run or canceled.\n  private delayedOperations: Array<DelayedOperation<unknown>> = [];\n\n  // visible for testing\n  failure: Error | null = null;\n\n  // Flag set while there's an outstanding AsyncQueue operation, used for\n  // assertion sanity-checks.\n  private operationInProgress = false;\n\n  // List of TimerIds to fast-forward delays for.\n  private timerIdsToSkip: TimerId[] = [];\n\n  // Backoff timer used to schedule retries for retryable operations\n  private backoff = new ExponentialBackoff(this, TimerId.AsyncQueueRetry);\n\n  // Visibility handler that triggers an immediate retry of all retryable\n  // operations. Meant to speed up recovery when we regain file system access\n  // after page comes into foreground.\n  private visibilityHandler = (): void => this.backoff.skipBackoff();\n\n  constructor() {\n    const window = PlatformSupport.getPlatform().window;\n    if (window && typeof window.addEventListener === 'function') {\n      window.addEventListener('visibilitychange', this.visibilityHandler);\n    }\n  }\n\n  // Is this AsyncQueue being shut down? If true, this instance will not enqueue\n  // any new operations, Promises from enqueue requests will not resolve.\n  get isShuttingDown(): boolean {\n    return this._isShuttingDown;\n  }\n\n  /**\n   * Adds a new operation to the queue without waiting for it to complete (i.e.\n   * we ignore the Promise result).\n   */\n  enqueueAndForget<T extends unknown>(op: () => Promise<T>): void {\n    // eslint-disable-next-line @typescript-eslint/no-floating-promises\n    this.enqueue(op);\n  }\n\n  /**\n   * Regardless if the queue has initialized shutdown, adds a new operation to the\n   * queue without waiting for it to complete (i.e. we ignore the Promise result).\n   */\n  enqueueAndForgetEvenAfterShutdown<T extends unknown>(\n    op: () => Promise<T>\n  ): void {\n    this.verifyNotFailed();\n    // eslint-disable-next-line @typescript-eslint/no-floating-promises\n    this.enqueueInternal(op);\n  }\n\n  /**\n   * Regardless if the queue has initialized shutdown, adds a new operation to the\n   * queue.\n   */\n  private enqueueEvenAfterShutdown<T extends unknown>(\n    op: () => Promise<T>\n  ): Promise<T> {\n    this.verifyNotFailed();\n    return this.enqueueInternal(op);\n  }\n\n  /**\n   * Adds a new operation to the queue and initialize the shut down of this queue.\n   * Returns a promise that will be resolved when the promise returned by the new\n   * operation is (with its value).\n   * Once this method is called, the only possible way to request running an operation\n   * is through `enqueueAndForgetEvenAfterShutdown`.\n   */\n  async enqueueAndInitiateShutdown(op: () => Promise<void>): Promise<void> {\n    this.verifyNotFailed();\n    if (!this._isShuttingDown) {\n      this._isShuttingDown = true;\n      const window = PlatformSupport.getPlatform().window;\n      if (window) {\n        window.removeEventListener('visibilitychange', this.visibilityHandler);\n      }\n      await this.enqueueEvenAfterShutdown(op);\n    }\n  }\n\n  /**\n   * Adds a new operation to the queue. Returns a promise that will be resolved\n   * when the promise returned by the new operation is (with its value).\n   */\n  enqueue<T extends unknown>(op: () => Promise<T>): Promise<T> {\n    this.verifyNotFailed();\n    if (this._isShuttingDown) {\n      // Return a Promise which never resolves.\n      return new Promise<T>(resolve => {});\n    }\n    return this.enqueueInternal(op);\n  }\n\n  /**\n   * Enqueue a retryable operation.\n   *\n   * A retryable operation is rescheduled with backoff if it fails with a\n   * IndexedDbTransactionError (the error type used by SimpleDb). All\n   * retryable operations are executed in order and only run if all prior\n   * operations were retried successfully.\n   */\n  enqueueRetryable(op: () => Promise<void>): void {\n    this.verifyNotFailed();\n\n    if (this._isShuttingDown) {\n      return;\n    }\n\n    this.retryableTail = this.retryableTail.then(() => {\n      const deferred = new Deferred<void>();\n      const retryingOp = async (): Promise<void> => {\n        try {\n          await op();\n          deferred.resolve();\n          this.backoff.reset();\n        } catch (e) {\n          if (isIndexedDbTransactionError(e)) {\n            logDebug(LOG_TAG, 'Operation failed with retryable error: ' + e);\n            this.backoff.backoffAndRun(retryingOp);\n          } else {\n            deferred.resolve();\n            throw e; // Failure will be handled by AsyncQueue\n          }\n        }\n      };\n      this.enqueueAndForget(retryingOp);\n      return deferred.promise;\n    });\n  }\n\n  private enqueueInternal<T extends unknown>(op: () => Promise<T>): Promise<T> {\n    const newTail = this.tail.then(() => {\n      this.operationInProgress = true;\n      return op()\n        .catch((error: FirestoreError) => {\n          this.failure = error;\n          this.operationInProgress = false;\n          const message = error.stack || error.message || '';\n          logError('INTERNAL UNHANDLED ERROR: ', message);\n\n          // Re-throw the error so that this.tail becomes a rejected Promise and\n          // all further attempts to chain (via .then) will just short-circuit\n          // and return the rejected Promise.\n          throw error;\n        })\n        .then(result => {\n          this.operationInProgress = false;\n          return result;\n        });\n    });\n    this.tail = newTail;\n    return newTail;\n  }\n\n  /**\n   * Schedules an operation to be queued on the AsyncQueue once the specified\n   * `delayMs` has elapsed. The returned DelayedOperation can be used to cancel\n   * or fast-forward the operation prior to its running.\n   */\n  enqueueAfterDelay<T extends unknown>(\n    timerId: TimerId,\n    delayMs: number,\n    op: () => Promise<T>\n  ): DelayedOperation<T> {\n    this.verifyNotFailed();\n\n    debugAssert(\n      delayMs >= 0,\n      `Attempted to schedule an operation with a negative delay of ${delayMs}`\n    );\n\n    // Fast-forward delays for timerIds that have been overriden.\n    if (this.timerIdsToSkip.indexOf(timerId) > -1) {\n      delayMs = 0;\n    }\n\n    const delayedOp = DelayedOperation.createAndSchedule<T>(\n      this,\n      timerId,\n      delayMs,\n      op,\n      removedOp =>\n        this.removeDelayedOperation(removedOp as DelayedOperation<unknown>)\n    );\n    this.delayedOperations.push(delayedOp as DelayedOperation<unknown>);\n    return delayedOp;\n  }\n\n  private verifyNotFailed(): void {\n    if (this.failure) {\n      fail(\n        'AsyncQueue is already failed: ' +\n          (this.failure.stack || this.failure.message)\n      );\n    }\n  }\n\n  /**\n   * Verifies there's an operation currently in-progress on the AsyncQueue.\n   * Unfortunately we can't verify that the running code is in the promise chain\n   * of that operation, so this isn't a foolproof check, but it should be enough\n   * to catch some bugs.\n   */\n  verifyOperationInProgress(): void {\n    debugAssert(\n      this.operationInProgress,\n      'verifyOpInProgress() called when no op in progress on this queue.'\n    );\n  }\n\n  /**\n   * Waits until all currently queued tasks are finished executing. Delayed\n   * operations are not run.\n   */\n  async drain(): Promise<void> {\n    // Operations in the queue prior to draining may have enqueued additional\n    // operations. Keep draining the queue until the tail is no longer advanced,\n    // which indicates that no more new operations were enqueued and that all\n    // operations were executed.\n    let currentTail: Promise<unknown>;\n    do {\n      currentTail = this.tail;\n      await currentTail;\n    } while (currentTail !== this.tail);\n  }\n\n  /**\n   * For Tests: Determine if a delayed operation with a particular TimerId\n   * exists.\n   */\n  containsDelayedOperation(timerId: TimerId): boolean {\n    for (const op of this.delayedOperations) {\n      if (op.timerId === timerId) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * For Tests: Runs some or all delayed operations early.\n   *\n   * @param lastTimerId Delayed operations up to and including this TimerId will\n   *  be drained. Pass TimerId.All to run all delayed operations.\n   * @returns a Promise that resolves once all operations have been run.\n   */\n  runAllDelayedOperationsUntil(lastTimerId: TimerId): Promise<void> {\n    // Note that draining may generate more delayed ops, so we do that first.\n    return this.drain().then(() => {\n      // Run ops in the same order they'd run if they ran naturally.\n      this.delayedOperations.sort((a, b) => a.targetTimeMs - b.targetTimeMs);\n\n      for (const op of this.delayedOperations) {\n        op.skipDelay();\n        if (lastTimerId !== TimerId.All && op.timerId === lastTimerId) {\n          break;\n        }\n      }\n\n      return this.drain();\n    });\n  }\n\n  /**\n   * For Tests: Skip all subsequent delays for a timer id.\n   */\n  skipDelaysForTimerId(timerId: TimerId): void {\n    this.timerIdsToSkip.push(timerId);\n  }\n\n  /** Called once a DelayedOperation is run or canceled. */\n  private removeDelayedOperation(op: DelayedOperation<unknown>): void {\n    // NOTE: indexOf / slice are O(n), but delayedOperations is expected to be small.\n    const index = this.delayedOperations.indexOf(op);\n    debugAssert(index >= 0, 'Delayed operation not found.');\n    this.delayedOperations.splice(index, 1);\n  }\n}\n\n/**\n * Returns a FirestoreError that can be surfaced to the user if the provided\n * error is an IndexedDbTransactionError. Re-throws the error otherwise.\n */\nexport function wrapInUserErrorIfRecoverable(\n  e: Error,\n  msg: string\n): FirestoreError {\n  logError(LOG_TAG, `${msg}: ${e}`);\n  if (isIndexedDbTransactionError(e)) {\n    return new FirestoreError(Code.UNAVAILABLE, `${msg}: ${e}`);\n  } else {\n    throw e;\n  }\n}\n","/**\n * @license\n * Copyright 2018 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ListenSequence } from '../core/listen_sequence';\nimport { ListenSequenceNumber, TargetId } from '../core/types';\nimport { debugAssert } from '../util/assert';\nimport { AsyncQueue, DelayedOperation, TimerId } from '../util/async_queue';\nimport { getLogLevel, logDebug, LogLevel } from '../util/log';\nimport { primitiveComparator } from '../util/misc';\nimport { SortedMap } from '../util/sorted_map';\nimport { SortedSet } from '../util/sorted_set';\nimport { ignoreIfPrimaryLeaseLoss, LocalStore } from './local_store';\nimport {\n  GarbageCollectionScheduler,\n  PersistenceTransaction\n} from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { TargetData } from './target_data';\nimport { isIndexedDbTransactionError } from './simple_db';\n\nconst LOG_TAG = 'LruGarbageCollector';\n\n/**\n * Persistence layers intending to use LRU Garbage collection should have reference delegates that\n * implement this interface. This interface defines the operations that the LRU garbage collector\n * needs from the persistence layer.\n */\nexport interface LruDelegate {\n  readonly garbageCollector: LruGarbageCollector;\n\n  /** Enumerates all the targets in the TargetCache. */\n  forEachTarget(\n    txn: PersistenceTransaction,\n    f: (target: TargetData) => void\n  ): PersistencePromise<void>;\n\n  getSequenceNumberCount(\n    txn: PersistenceTransaction\n  ): PersistencePromise<number>;\n\n  /**\n   * Enumerates sequence numbers for documents not associated with a target.\n   * Note that this may include duplicate sequence numbers.\n   */\n  forEachOrphanedDocumentSequenceNumber(\n    txn: PersistenceTransaction,\n    f: (sequenceNumber: ListenSequenceNumber) => void\n  ): PersistencePromise<void>;\n\n  /**\n   * Removes all targets that have a sequence number less than or equal to `upperBound`, and are not\n   * present in the `activeTargetIds` set.\n   *\n   * @return the number of targets removed.\n   */\n  removeTargets(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber,\n    activeTargetIds: ActiveTargets\n  ): PersistencePromise<number>;\n\n  /**\n   * Removes all unreferenced documents from the cache that have a sequence number less than or\n   * equal to the given `upperBound`.\n   *\n   * @return the number of documents removed.\n   */\n  removeOrphanedDocuments(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber\n  ): PersistencePromise<number>;\n\n  getCacheSize(txn: PersistenceTransaction): PersistencePromise<number>;\n}\n\n/**\n * Describes a map whose keys are active target ids. We do not care about the type of the\n * values.\n */\nexport type ActiveTargets = SortedMap<TargetId, unknown>;\n\n// The type and comparator for the items contained in the SortedSet used in\n// place of a priority queue for the RollingSequenceNumberBuffer.\ntype BufferEntry = [ListenSequenceNumber, number];\nfunction bufferEntryComparator(\n  [aSequence, aIndex]: BufferEntry,\n  [bSequence, bIndex]: BufferEntry\n): number {\n  const seqCmp = primitiveComparator(aSequence, bSequence);\n  if (seqCmp === 0) {\n    // This order doesn't matter, but we can bias against churn by sorting\n    // entries created earlier as less than newer entries.\n    return primitiveComparator(aIndex, bIndex);\n  } else {\n    return seqCmp;\n  }\n}\n\n/**\n * Used to calculate the nth sequence number. Keeps a rolling buffer of the\n * lowest n values passed to `addElement`, and finally reports the largest of\n * them in `maxValue`.\n */\nclass RollingSequenceNumberBuffer {\n  private buffer: SortedSet<BufferEntry> = new SortedSet<BufferEntry>(\n    bufferEntryComparator\n  );\n\n  private previousIndex = 0;\n\n  constructor(private readonly maxElements: number) {}\n\n  private nextIndex(): number {\n    return ++this.previousIndex;\n  }\n\n  addElement(sequenceNumber: ListenSequenceNumber): void {\n    const entry: BufferEntry = [sequenceNumber, this.nextIndex()];\n    if (this.buffer.size < this.maxElements) {\n      this.buffer = this.buffer.add(entry);\n    } else {\n      const highestValue = this.buffer.last()!;\n      if (bufferEntryComparator(entry, highestValue) < 0) {\n        this.buffer = this.buffer.delete(highestValue).add(entry);\n      }\n    }\n  }\n\n  get maxValue(): ListenSequenceNumber {\n    // Guaranteed to be non-empty. If we decide we are not collecting any\n    // sequence numbers, nthSequenceNumber below short-circuits. If we have\n    // decided that we are collecting n sequence numbers, it's because n is some\n    // percentage of the existing sequence numbers. That means we should never\n    // be in a situation where we are collecting sequence numbers but don't\n    // actually have any.\n    return this.buffer.last()![0];\n  }\n}\n\n/**\n * Describes the results of a garbage collection run. `didRun` will be set to\n * `false` if collection was skipped (either it is disabled or the cache size\n * has not hit the threshold). If collection ran, the other fields will be\n * filled in with the details of the results.\n */\nexport interface LruResults {\n  readonly didRun: boolean;\n  readonly sequenceNumbersCollected: number;\n  readonly targetsRemoved: number;\n  readonly documentsRemoved: number;\n}\n\nconst GC_DID_NOT_RUN: LruResults = {\n  didRun: false,\n  sequenceNumbersCollected: 0,\n  targetsRemoved: 0,\n  documentsRemoved: 0\n};\n\nexport class LruParams {\n  static readonly COLLECTION_DISABLED = -1;\n  static readonly MINIMUM_CACHE_SIZE_BYTES = 1 * 1024 * 1024;\n  static readonly DEFAULT_CACHE_SIZE_BYTES = 40 * 1024 * 1024;\n  private static readonly DEFAULT_COLLECTION_PERCENTILE = 10;\n  private static readonly DEFAULT_MAX_SEQUENCE_NUMBERS_TO_COLLECT = 1000;\n\n  static withCacheSize(cacheSize: number): LruParams {\n    return new LruParams(\n      cacheSize,\n      LruParams.DEFAULT_COLLECTION_PERCENTILE,\n      LruParams.DEFAULT_MAX_SEQUENCE_NUMBERS_TO_COLLECT\n    );\n  }\n\n  static readonly DEFAULT: LruParams = new LruParams(\n    LruParams.DEFAULT_CACHE_SIZE_BYTES,\n    LruParams.DEFAULT_COLLECTION_PERCENTILE,\n    LruParams.DEFAULT_MAX_SEQUENCE_NUMBERS_TO_COLLECT\n  );\n\n  static readonly DISABLED: LruParams = new LruParams(\n    LruParams.COLLECTION_DISABLED,\n    0,\n    0\n  );\n\n  constructor(\n    // When we attempt to collect, we will only do so if the cache size is greater than this\n    // threshold. Passing `COLLECTION_DISABLED` here will cause collection to always be skipped.\n    readonly cacheSizeCollectionThreshold: number,\n    // The percentage of sequence numbers that we will attempt to collect\n    readonly percentileToCollect: number,\n    // A cap on the total number of sequence numbers that will be collected. This prevents\n    // us from collecting a huge number of sequence numbers if the cache has grown very large.\n    readonly maximumSequenceNumbersToCollect: number\n  ) {}\n}\n\n/** How long we wait to try running LRU GC after SDK initialization. */\nconst INITIAL_GC_DELAY_MS = 1 * 60 * 1000;\n/** Minimum amount of time between GC checks, after the first one. */\nconst REGULAR_GC_DELAY_MS = 5 * 60 * 1000;\n\n/**\n * This class is responsible for the scheduling of LRU garbage collection. It handles checking\n * whether or not GC is enabled, as well as which delay to use before the next run.\n */\nexport class LruScheduler implements GarbageCollectionScheduler {\n  private hasRun: boolean = false;\n  private gcTask: DelayedOperation<void> | null;\n\n  constructor(\n    private readonly garbageCollector: LruGarbageCollector,\n    private readonly asyncQueue: AsyncQueue\n  ) {\n    this.gcTask = null;\n  }\n\n  start(localStore: LocalStore): void {\n    debugAssert(\n      this.gcTask === null,\n      'Cannot start an already started LruScheduler'\n    );\n    if (\n      this.garbageCollector.params.cacheSizeCollectionThreshold !==\n      LruParams.COLLECTION_DISABLED\n    ) {\n      this.scheduleGC(localStore);\n    }\n  }\n\n  stop(): void {\n    if (this.gcTask) {\n      this.gcTask.cancel();\n      this.gcTask = null;\n    }\n  }\n\n  get started(): boolean {\n    return this.gcTask !== null;\n  }\n\n  private scheduleGC(localStore: LocalStore): void {\n    debugAssert(\n      this.gcTask === null,\n      'Cannot schedule GC while a task is pending'\n    );\n    const delay = this.hasRun ? REGULAR_GC_DELAY_MS : INITIAL_GC_DELAY_MS;\n    logDebug(\n      'LruGarbageCollector',\n      `Garbage collection scheduled in ${delay}ms`\n    );\n    this.gcTask = this.asyncQueue.enqueueAfterDelay(\n      TimerId.LruGarbageCollection,\n      delay,\n      async () => {\n        this.gcTask = null;\n        this.hasRun = true;\n        try {\n          await localStore.collectGarbage(this.garbageCollector);\n        } catch (e) {\n          if (isIndexedDbTransactionError(e)) {\n            logDebug(\n              LOG_TAG,\n              'Ignoring IndexedDB error during garbage collection: ',\n              e\n            );\n          } else {\n            await ignoreIfPrimaryLeaseLoss(e);\n          }\n        }\n        await this.scheduleGC(localStore);\n      }\n    );\n  }\n}\n\n/** Implements the steps for LRU garbage collection. */\nexport class LruGarbageCollector {\n  constructor(\n    private readonly delegate: LruDelegate,\n    readonly params: LruParams\n  ) {}\n\n  /** Given a percentile of target to collect, returns the number of targets to collect. */\n  calculateTargetCount(\n    txn: PersistenceTransaction,\n    percentile: number\n  ): PersistencePromise<number> {\n    return this.delegate.getSequenceNumberCount(txn).next(targetCount => {\n      return Math.floor((percentile / 100.0) * targetCount);\n    });\n  }\n\n  /** Returns the nth sequence number, counting in order from the smallest. */\n  nthSequenceNumber(\n    txn: PersistenceTransaction,\n    n: number\n  ): PersistencePromise<ListenSequenceNumber> {\n    if (n === 0) {\n      return PersistencePromise.resolve(ListenSequence.INVALID);\n    }\n\n    const buffer = new RollingSequenceNumberBuffer(n);\n    return this.delegate\n      .forEachTarget(txn, target => buffer.addElement(target.sequenceNumber))\n      .next(() => {\n        return this.delegate.forEachOrphanedDocumentSequenceNumber(\n          txn,\n          sequenceNumber => buffer.addElement(sequenceNumber)\n        );\n      })\n      .next(() => buffer.maxValue);\n  }\n\n  /**\n   * Removes targets with a sequence number equal to or less than the given upper bound, and removes\n   * document associations with those targets.\n   */\n  removeTargets(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber,\n    activeTargetIds: ActiveTargets\n  ): PersistencePromise<number> {\n    return this.delegate.removeTargets(txn, upperBound, activeTargetIds);\n  }\n\n  /**\n   * Removes documents that have a sequence number equal to or less than the upper bound and are not\n   * otherwise pinned.\n   */\n  removeOrphanedDocuments(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber\n  ): PersistencePromise<number> {\n    return this.delegate.removeOrphanedDocuments(txn, upperBound);\n  }\n\n  collect(\n    txn: PersistenceTransaction,\n    activeTargetIds: ActiveTargets\n  ): PersistencePromise<LruResults> {\n    if (\n      this.params.cacheSizeCollectionThreshold === LruParams.COLLECTION_DISABLED\n    ) {\n      logDebug('LruGarbageCollector', 'Garbage collection skipped; disabled');\n      return PersistencePromise.resolve(GC_DID_NOT_RUN);\n    }\n\n    return this.getCacheSize(txn).next(cacheSize => {\n      if (cacheSize < this.params.cacheSizeCollectionThreshold) {\n        logDebug(\n          'LruGarbageCollector',\n          `Garbage collection skipped; Cache size ${cacheSize} ` +\n            `is lower than threshold ${this.params.cacheSizeCollectionThreshold}`\n        );\n        return GC_DID_NOT_RUN;\n      } else {\n        return this.runGarbageCollection(txn, activeTargetIds);\n      }\n    });\n  }\n\n  getCacheSize(txn: PersistenceTransaction): PersistencePromise<number> {\n    return this.delegate.getCacheSize(txn);\n  }\n\n  private runGarbageCollection(\n    txn: PersistenceTransaction,\n    activeTargetIds: ActiveTargets\n  ): PersistencePromise<LruResults> {\n    let upperBoundSequenceNumber: number;\n    let sequenceNumbersToCollect: number, targetsRemoved: number;\n    // Timestamps for various pieces of the process\n    let countedTargetsTs: number,\n      foundUpperBoundTs: number,\n      removedTargetsTs: number,\n      removedDocumentsTs: number;\n    const startTs = Date.now();\n    return this.calculateTargetCount(txn, this.params.percentileToCollect)\n      .next(sequenceNumbers => {\n        // Cap at the configured max\n        if (sequenceNumbers > this.params.maximumSequenceNumbersToCollect) {\n          logDebug(\n            'LruGarbageCollector',\n            'Capping sequence numbers to collect down ' +\n              `to the maximum of ${this.params.maximumSequenceNumbersToCollect} ` +\n              `from ${sequenceNumbers}`\n          );\n          sequenceNumbersToCollect = this.params\n            .maximumSequenceNumbersToCollect;\n        } else {\n          sequenceNumbersToCollect = sequenceNumbers;\n        }\n        countedTargetsTs = Date.now();\n\n        return this.nthSequenceNumber(txn, sequenceNumbersToCollect);\n      })\n      .next(upperBound => {\n        upperBoundSequenceNumber = upperBound;\n        foundUpperBoundTs = Date.now();\n\n        return this.removeTargets(\n          txn,\n          upperBoundSequenceNumber,\n          activeTargetIds\n        );\n      })\n      .next(numTargetsRemoved => {\n        targetsRemoved = numTargetsRemoved;\n        removedTargetsTs = Date.now();\n\n        return this.removeOrphanedDocuments(txn, upperBoundSequenceNumber);\n      })\n      .next(documentsRemoved => {\n        removedDocumentsTs = Date.now();\n\n        if (getLogLevel() <= LogLevel.DEBUG) {\n          const desc =\n            'LRU Garbage Collection\\n' +\n            `\\tCounted targets in ${countedTargetsTs - startTs}ms\\n` +\n            `\\tDetermined least recently used ${sequenceNumbersToCollect} in ` +\n            `${foundUpperBoundTs - countedTargetsTs}ms\\n` +\n            `\\tRemoved ${targetsRemoved} targets in ` +\n            `${removedTargetsTs - foundUpperBoundTs}ms\\n` +\n            `\\tRemoved ${documentsRemoved} documents in ` +\n            `${removedDocumentsTs - removedTargetsTs}ms\\n` +\n            `Total Duration: ${removedDocumentsTs - startTs}ms`;\n          logDebug('LruGarbageCollector', desc);\n        }\n\n        return PersistencePromise.resolve<LruResults>({\n          didRun: true,\n          sequenceNumbersCollected: sequenceNumbersToCollect,\n          targetsRemoved,\n          documentsRemoved\n        });\n      });\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Timestamp } from '../api/timestamp';\nimport { User } from '../auth/user';\nimport { Query } from '../core/query';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { Target } from '../core/target';\nimport { BatchId, TargetId } from '../core/types';\nimport {\n  DocumentKeySet,\n  documentKeySet,\n  DocumentMap,\n  maybeDocumentMap,\n  MaybeDocumentMap\n} from '../model/collections';\nimport { MaybeDocument, NoDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { Mutation, PatchMutation, Precondition } from '../model/mutation';\nimport {\n  BATCHID_UNKNOWN,\n  MutationBatch,\n  MutationBatchResult\n} from '../model/mutation_batch';\nimport { RemoteEvent, TargetChange } from '../remote/remote_event';\nimport { hardAssert, debugAssert } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { logDebug } from '../util/log';\nimport { primitiveComparator } from '../util/misc';\nimport { ObjectMap } from '../util/obj_map';\nimport { SortedMap } from '../util/sorted_map';\n\nimport { LocalDocumentsView } from './local_documents_view';\nimport { LocalViewChanges } from './local_view_changes';\nimport { LruGarbageCollector, LruResults } from './lru_garbage_collector';\nimport { MutationQueue } from './mutation_queue';\nimport {\n  Persistence,\n  PersistenceTransaction,\n  PRIMARY_LEASE_LOST_ERROR_MSG\n} from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { TargetCache } from './target_cache';\nimport { QueryEngine } from './query_engine';\nimport { RemoteDocumentCache } from './remote_document_cache';\nimport { RemoteDocumentChangeBuffer } from './remote_document_change_buffer';\nimport { ClientId } from './shared_client_state';\nimport { TargetData, TargetPurpose } from './target_data';\nimport { ByteString } from '../util/byte_string';\nimport { IndexedDbPersistence } from './indexeddb_persistence';\nimport { IndexedDbMutationQueue } from './indexeddb_mutation_queue';\nimport { IndexedDbRemoteDocumentCache } from './indexeddb_remote_document_cache';\nimport { IndexedDbTargetCache } from './indexeddb_target_cache';\nimport { extractFieldMask } from '../model/object_value';\nimport { isIndexedDbTransactionError } from './simple_db';\n\nconst LOG_TAG = 'LocalStore';\n\n/** The result of a write to the local store. */\nexport interface LocalWriteResult {\n  batchId: BatchId;\n  changes: MaybeDocumentMap;\n}\n\n/** The result of a user-change operation in the local store. */\nexport interface UserChangeResult {\n  readonly affectedDocuments: MaybeDocumentMap;\n  readonly removedBatchIds: BatchId[];\n  readonly addedBatchIds: BatchId[];\n}\n\n/** The result of executing a query against the local store. */\nexport interface QueryResult {\n  readonly documents: DocumentMap;\n  readonly remoteKeys: DocumentKeySet;\n}\n\n/**\n * Local storage in the Firestore client. Coordinates persistence components\n * like the mutation queue and remote document cache to present a\n * latency-compensated view of stored data.\n *\n * The LocalStore is responsible for accepting mutations from the Sync Engine.\n * Writes from the client are put into a queue as provisional Mutations until\n * they are processed by the RemoteStore and confirmed as having been written\n * to the server.\n *\n * The local store provides the local version of documents that have been\n * modified locally. It maintains the constraint:\n *\n *   LocalDocument = RemoteDocument + Active(LocalMutations)\n *\n * (Active mutations are those that are enqueued and have not been previously\n * acknowledged or rejected).\n *\n * The RemoteDocument (\"ground truth\") state is provided via the\n * applyChangeBatch method. It will be some version of a server-provided\n * document OR will be a server-provided document PLUS acknowledged mutations:\n *\n *   RemoteDocument' = RemoteDocument + Acknowledged(LocalMutations)\n *\n * Note that this \"dirty\" version of a RemoteDocument will not be identical to a\n * server base version, since it has LocalMutations added to it pending getting\n * an authoritative copy from the server.\n *\n * Since LocalMutations can be rejected by the server, we have to be able to\n * revert a LocalMutation that has already been applied to the LocalDocument\n * (typically done by replaying all remaining LocalMutations to the\n * RemoteDocument to re-apply).\n *\n * The LocalStore is responsible for the garbage collection of the documents it\n * contains. For now, it every doc referenced by a view, the mutation queue, or\n * the RemoteStore.\n *\n * It also maintains the persistence of mapping queries to resume tokens and\n * target ids. It needs to know this data about queries to properly know what\n * docs it would be allowed to garbage collect.\n *\n * The LocalStore must be able to efficiently execute queries against its local\n * cache of the documents, to provide the initial set of results before any\n * remote changes have been received.\n *\n * Note: In TypeScript, most methods return Promises since the implementation\n * may rely on fetching data from IndexedDB which is async.\n * These Promises will only be rejected on an I/O error or other internal\n * (unexpected) failure (e.g. failed assert) and always represent an\n * unrecoverable error (should be caught / reported by the async_queue).\n */\nexport class LocalStore {\n  /**\n   * The maximum time to leave a resume token buffered without writing it out.\n   * This value is arbitrary: it's long enough to avoid several writes\n   * (possibly indefinitely if updates come more frequently than this) but\n   * short enough that restarting after crashing will still have a pretty\n   * recent resume token.\n   */\n  private static readonly RESUME_TOKEN_MAX_AGE_MICROS = 5 * 60 * 1e6;\n\n  /**\n   * The set of all mutations that have been sent but not yet been applied to\n   * the backend.\n   */\n  protected mutationQueue: MutationQueue;\n\n  /** The set of all cached remote documents. */\n  protected remoteDocuments: RemoteDocumentCache;\n\n  /**\n   * The \"local\" view of all documents (layering mutationQueue on top of\n   * remoteDocumentCache).\n   */\n  protected localDocuments: LocalDocumentsView;\n\n  /** Maps a target to its `TargetData`. */\n  protected targetCache: TargetCache;\n\n  /**\n   * Maps a targetID to data about its target.\n   *\n   * PORTING NOTE: We are using an immutable data structure on Web to make re-runs\n   * of `applyRemoteEvent()` idempotent.\n   */\n  protected targetDataByTarget = new SortedMap<TargetId, TargetData>(\n    primitiveComparator\n  );\n\n  /** Maps a target to its targetID. */\n  // TODO(wuandy): Evaluate if TargetId can be part of Target.\n  private targetIdByTarget = new ObjectMap<Target, TargetId>(t =>\n    t.canonicalId()\n  );\n\n  /**\n   * The read time of the last entry processed by `getNewDocumentChanges()`.\n   *\n   * PORTING NOTE: This is only used for multi-tab synchronization.\n   */\n  protected lastDocumentChangeReadTime = SnapshotVersion.min();\n\n  constructor(\n    /** Manages our in-memory or durable persistence. */\n    protected persistence: Persistence,\n    private queryEngine: QueryEngine,\n    initialUser: User\n  ) {\n    debugAssert(\n      persistence.started,\n      'LocalStore was passed an unstarted persistence implementation'\n    );\n    this.mutationQueue = persistence.getMutationQueue(initialUser);\n    this.remoteDocuments = persistence.getRemoteDocumentCache();\n    this.targetCache = persistence.getTargetCache();\n    this.localDocuments = new LocalDocumentsView(\n      this.remoteDocuments,\n      this.mutationQueue,\n      this.persistence.getIndexManager()\n    );\n    this.queryEngine.setLocalDocumentsView(this.localDocuments);\n  }\n\n  /** Starts the LocalStore. */\n  start(): Promise<void> {\n    return Promise.resolve();\n  }\n\n  /**\n   * Tells the LocalStore that the currently authenticated user has changed.\n   *\n   * In response the local store switches the mutation queue to the new user and\n   * returns any resulting document changes.\n   */\n  // PORTING NOTE: Android and iOS only return the documents affected by the\n  // change.\n  async handleUserChange(user: User): Promise<UserChangeResult> {\n    let newMutationQueue = this.mutationQueue;\n    let newLocalDocuments = this.localDocuments;\n\n    const result = await this.persistence.runTransaction(\n      'Handle user change',\n      'readonly',\n      txn => {\n        // Swap out the mutation queue, grabbing the pending mutation batches\n        // before and after.\n        let oldBatches: MutationBatch[];\n        return this.mutationQueue\n          .getAllMutationBatches(txn)\n          .next(promisedOldBatches => {\n            oldBatches = promisedOldBatches;\n\n            newMutationQueue = this.persistence.getMutationQueue(user);\n\n            // Recreate our LocalDocumentsView using the new\n            // MutationQueue.\n            newLocalDocuments = new LocalDocumentsView(\n              this.remoteDocuments,\n              newMutationQueue,\n              this.persistence.getIndexManager()\n            );\n            return newMutationQueue.getAllMutationBatches(txn);\n          })\n          .next(newBatches => {\n            const removedBatchIds: BatchId[] = [];\n            const addedBatchIds: BatchId[] = [];\n\n            // Union the old/new changed keys.\n            let changedKeys = documentKeySet();\n\n            for (const batch of oldBatches) {\n              removedBatchIds.push(batch.batchId);\n              for (const mutation of batch.mutations) {\n                changedKeys = changedKeys.add(mutation.key);\n              }\n            }\n\n            for (const batch of newBatches) {\n              addedBatchIds.push(batch.batchId);\n              for (const mutation of batch.mutations) {\n                changedKeys = changedKeys.add(mutation.key);\n              }\n            }\n\n            // Return the set of all (potentially) changed documents and the list\n            // of mutation batch IDs that were affected by change.\n            return newLocalDocuments\n              .getDocuments(txn, changedKeys)\n              .next(affectedDocuments => {\n                return {\n                  affectedDocuments,\n                  removedBatchIds,\n                  addedBatchIds\n                };\n              });\n          });\n      }\n    );\n\n    this.mutationQueue = newMutationQueue;\n    this.localDocuments = newLocalDocuments;\n    this.queryEngine.setLocalDocumentsView(this.localDocuments);\n\n    return result;\n  }\n\n  /* Accept locally generated Mutations and commit them to storage. */\n  localWrite(mutations: Mutation[]): Promise<LocalWriteResult> {\n    const localWriteTime = Timestamp.now();\n    const keys = mutations.reduce(\n      (keys, m) => keys.add(m.key),\n      documentKeySet()\n    );\n\n    let existingDocs: MaybeDocumentMap;\n\n    return this.persistence\n      .runTransaction('Locally write mutations', 'readwrite', txn => {\n        // Load and apply all existing mutations. This lets us compute the\n        // current base state for all non-idempotent transforms before applying\n        // any additional user-provided writes.\n        return this.localDocuments.getDocuments(txn, keys).next(docs => {\n          existingDocs = docs;\n\n          // For non-idempotent mutations (such as `FieldValue.increment()`),\n          // we record the base state in a separate patch mutation. This is\n          // later used to guarantee consistent values and prevents flicker\n          // even if the backend sends us an update that already includes our\n          // transform.\n          const baseMutations: Mutation[] = [];\n\n          for (const mutation of mutations) {\n            const baseValue = mutation.extractBaseValue(\n              existingDocs.get(mutation.key)\n            );\n            if (baseValue != null) {\n              // NOTE: The base state should only be applied if there's some\n              // existing document to override, so use a Precondition of\n              // exists=true\n              baseMutations.push(\n                new PatchMutation(\n                  mutation.key,\n                  baseValue,\n                  extractFieldMask(baseValue.proto.mapValue!),\n                  Precondition.exists(true)\n                )\n              );\n            }\n          }\n\n          return this.mutationQueue.addMutationBatch(\n            txn,\n            localWriteTime,\n            baseMutations,\n            mutations\n          );\n        });\n      })\n      .then(batch => {\n        const changes = batch.applyToLocalDocumentSet(existingDocs);\n        return { batchId: batch.batchId, changes };\n      });\n  }\n\n  /**\n   * Acknowledge the given batch.\n   *\n   * On the happy path when a batch is acknowledged, the local store will\n   *\n   *  + remove the batch from the mutation queue;\n   *  + apply the changes to the remote document cache;\n   *  + recalculate the latency compensated view implied by those changes (there\n   *    may be mutations in the queue that affect the documents but haven't been\n   *    acknowledged yet); and\n   *  + give the changed documents back the sync engine\n   *\n   * @returns The resulting (modified) documents.\n   */\n  acknowledgeBatch(\n    batchResult: MutationBatchResult\n  ): Promise<MaybeDocumentMap> {\n    return this.persistence.runTransaction(\n      'Acknowledge batch',\n      'readwrite-primary',\n      txn => {\n        const affected = batchResult.batch.keys();\n        const documentBuffer = this.remoteDocuments.newChangeBuffer({\n          trackRemovals: true // Make sure document removals show up in `getNewDocumentChanges()`\n        });\n        return this.mutationQueue\n          .acknowledgeBatch(txn, batchResult.batch, batchResult.streamToken)\n          .next(() =>\n            this.applyWriteToRemoteDocuments(txn, batchResult, documentBuffer)\n          )\n          .next(() => documentBuffer.apply(txn))\n          .next(() => this.mutationQueue.performConsistencyCheck(txn))\n          .next(() => this.localDocuments.getDocuments(txn, affected));\n      }\n    );\n  }\n\n  /**\n   * Remove mutations from the MutationQueue for the specified batch;\n   * LocalDocuments will be recalculated.\n   *\n   * @returns The resulting modified documents.\n   */\n  rejectBatch(batchId: BatchId): Promise<MaybeDocumentMap> {\n    return this.persistence.runTransaction(\n      'Reject batch',\n      'readwrite-primary',\n      txn => {\n        let affectedKeys: DocumentKeySet;\n        return this.mutationQueue\n          .lookupMutationBatch(txn, batchId)\n          .next((batch: MutationBatch | null) => {\n            hardAssert(batch !== null, 'Attempt to reject nonexistent batch!');\n            affectedKeys = batch.keys();\n            return this.mutationQueue.removeMutationBatch(txn, batch);\n          })\n          .next(() => {\n            return this.mutationQueue.performConsistencyCheck(txn);\n          })\n          .next(() => {\n            return this.localDocuments.getDocuments(txn, affectedKeys);\n          });\n      }\n    );\n  }\n\n  /**\n   * Returns the largest (latest) batch id in mutation queue that is pending server response.\n   * Returns `BATCHID_UNKNOWN` if the queue is empty.\n   */\n  getHighestUnacknowledgedBatchId(): Promise<BatchId> {\n    return this.persistence.runTransaction(\n      'Get highest unacknowledged batch id',\n      'readonly',\n      txn => {\n        return this.mutationQueue.getHighestUnacknowledgedBatchId(txn);\n      }\n    );\n  }\n\n  /** Returns the last recorded stream token for the current user. */\n  getLastStreamToken(): Promise<ByteString> {\n    return this.persistence.runTransaction(\n      'Get last stream token',\n      'readonly',\n      txn => {\n        return this.mutationQueue.getLastStreamToken(txn);\n      }\n    );\n  }\n\n  /**\n   * Sets the stream token for the current user without acknowledging any\n   * mutation batch. This is usually only useful after a stream handshake or in\n   * response to an error that requires clearing the stream token.\n   */\n  setLastStreamToken(streamToken: ByteString): Promise<void> {\n    return this.persistence.runTransaction(\n      'Set last stream token',\n      'readwrite-primary',\n      txn => {\n        return this.mutationQueue.setLastStreamToken(txn, streamToken);\n      }\n    );\n  }\n\n  /**\n   * Returns the last consistent snapshot processed (used by the RemoteStore to\n   * determine whether to buffer incoming snapshots from the backend).\n   */\n  getLastRemoteSnapshotVersion(): Promise<SnapshotVersion> {\n    return this.persistence.runTransaction(\n      'Get last remote snapshot version',\n      'readonly',\n      txn => this.targetCache.getLastRemoteSnapshotVersion(txn)\n    );\n  }\n\n  /**\n   * Update the \"ground-state\" (remote) documents. We assume that the remote\n   * event reflects any write batches that have been acknowledged or rejected\n   * (i.e. we do not re-apply local mutations to updates from this event).\n   *\n   * LocalDocuments are re-calculated if there are remaining mutations in the\n   * queue.\n   */\n  applyRemoteEvent(remoteEvent: RemoteEvent): Promise<MaybeDocumentMap> {\n    const remoteVersion = remoteEvent.snapshotVersion;\n    let newTargetDataByTargetMap = this.targetDataByTarget;\n\n    return this.persistence\n      .runTransaction('Apply remote event', 'readwrite-primary', txn => {\n        const documentBuffer = this.remoteDocuments.newChangeBuffer({\n          trackRemovals: true // Make sure document removals show up in `getNewDocumentChanges()`\n        });\n\n        // Reset newTargetDataByTargetMap in case this transaction gets re-run.\n        newTargetDataByTargetMap = this.targetDataByTarget;\n\n        const promises = [] as Array<PersistencePromise<void>>;\n        remoteEvent.targetChanges.forEach((change, targetId) => {\n          const oldTargetData = newTargetDataByTargetMap.get(targetId);\n          if (!oldTargetData) {\n            return;\n          }\n\n          // Only update the remote keys if the target is still active. This\n          // ensures that we can persist the updated target data along with\n          // the updated assignment.\n          promises.push(\n            this.targetCache\n              .removeMatchingKeys(txn, change.removedDocuments, targetId)\n              .next(() => {\n                return this.targetCache.addMatchingKeys(\n                  txn,\n                  change.addedDocuments,\n                  targetId\n                );\n              })\n          );\n\n          const resumeToken = change.resumeToken;\n          // Update the resume token if the change includes one.\n          if (resumeToken.approximateByteSize() > 0) {\n            const newTargetData = oldTargetData\n              .withResumeToken(resumeToken, remoteVersion)\n              .withSequenceNumber(txn.currentSequenceNumber);\n            newTargetDataByTargetMap = newTargetDataByTargetMap.insert(\n              targetId,\n              newTargetData\n            );\n\n            // Update the target data if there are target changes (or if\n            // sufficient time has passed since the last update).\n            if (\n              LocalStore.shouldPersistTargetData(\n                oldTargetData,\n                newTargetData,\n                change\n              )\n            ) {\n              promises.push(\n                this.targetCache.updateTargetData(txn, newTargetData)\n              );\n            }\n          }\n        });\n\n        let changedDocs = maybeDocumentMap();\n        let updatedKeys = documentKeySet();\n        remoteEvent.documentUpdates.forEach((key, doc) => {\n          updatedKeys = updatedKeys.add(key);\n        });\n\n        // Each loop iteration only affects its \"own\" doc, so it's safe to get all the remote\n        // documents in advance in a single call.\n        promises.push(\n          documentBuffer.getEntries(txn, updatedKeys).next(existingDocs => {\n            remoteEvent.documentUpdates.forEach((key, doc) => {\n              const existingDoc = existingDocs.get(key);\n\n              // Note: The order of the steps below is important, since we want\n              // to ensure that rejected limbo resolutions (which fabricate\n              // NoDocuments with SnapshotVersion.min()) never add documents to\n              // cache.\n              if (\n                doc instanceof NoDocument &&\n                doc.version.isEqual(SnapshotVersion.min())\n              ) {\n                // NoDocuments with SnapshotVersion.min() are used in manufactured\n                // events. We remove these documents from cache since we lost\n                // access.\n                documentBuffer.removeEntry(key, remoteVersion);\n                changedDocs = changedDocs.insert(key, doc);\n              } else if (\n                existingDoc == null ||\n                doc.version.compareTo(existingDoc.version) > 0 ||\n                (doc.version.compareTo(existingDoc.version) === 0 &&\n                  existingDoc.hasPendingWrites)\n              ) {\n                debugAssert(\n                  !SnapshotVersion.min().isEqual(remoteVersion),\n                  'Cannot add a document when the remote version is zero'\n                );\n                documentBuffer.addEntry(doc, remoteVersion);\n                changedDocs = changedDocs.insert(key, doc);\n              } else {\n                logDebug(\n                  LOG_TAG,\n                  'Ignoring outdated watch update for ',\n                  key,\n                  '. Current version:',\n                  existingDoc.version,\n                  ' Watch version:',\n                  doc.version\n                );\n              }\n\n              if (remoteEvent.resolvedLimboDocuments.has(key)) {\n                promises.push(\n                  this.persistence.referenceDelegate.updateLimboDocument(\n                    txn,\n                    key\n                  )\n                );\n              }\n            });\n          })\n        );\n\n        // HACK: The only reason we allow a null snapshot version is so that we\n        // can synthesize remote events when we get permission denied errors while\n        // trying to resolve the state of a locally cached document that is in\n        // limbo.\n        if (!remoteVersion.isEqual(SnapshotVersion.min())) {\n          const updateRemoteVersion = this.targetCache\n            .getLastRemoteSnapshotVersion(txn)\n            .next(lastRemoteSnapshotVersion => {\n              debugAssert(\n                remoteVersion.compareTo(lastRemoteSnapshotVersion) >= 0,\n                'Watch stream reverted to previous snapshot?? ' +\n                  remoteVersion +\n                  ' < ' +\n                  lastRemoteSnapshotVersion\n              );\n              return this.targetCache.setTargetsMetadata(\n                txn,\n                txn.currentSequenceNumber,\n                remoteVersion\n              );\n            });\n          promises.push(updateRemoteVersion);\n        }\n\n        return PersistencePromise.waitFor(promises)\n          .next(() => documentBuffer.apply(txn))\n          .next(() => {\n            return this.localDocuments.getLocalViewOfDocuments(\n              txn,\n              changedDocs\n            );\n          });\n      })\n      .then(changedDocs => {\n        this.targetDataByTarget = newTargetDataByTargetMap;\n        return changedDocs;\n      });\n  }\n\n  /**\n   * Returns true if the newTargetData should be persisted during an update of\n   * an active target. TargetData should always be persisted when a target is\n   * being released and should not call this function.\n   *\n   * While the target is active, TargetData updates can be omitted when nothing\n   * about the target has changed except metadata like the resume token or\n   * snapshot version. Occasionally it's worth the extra write to prevent these\n   * values from getting too stale after a crash, but this doesn't have to be\n   * too frequent.\n   */\n  private static shouldPersistTargetData(\n    oldTargetData: TargetData,\n    newTargetData: TargetData,\n    change: TargetChange\n  ): boolean {\n    hardAssert(\n      newTargetData.resumeToken.approximateByteSize() > 0,\n      'Attempted to persist target data with no resume token'\n    );\n\n    // Always persist target data if we don't already have a resume token.\n    if (oldTargetData.resumeToken.approximateByteSize() === 0) {\n      return true;\n    }\n\n    // Don't allow resume token changes to be buffered indefinitely. This\n    // allows us to be reasonably up-to-date after a crash and avoids needing\n    // to loop over all active queries on shutdown. Especially in the browser\n    // we may not get time to do anything interesting while the current tab is\n    // closing.\n    const timeDelta =\n      newTargetData.snapshotVersion.toMicroseconds() -\n      oldTargetData.snapshotVersion.toMicroseconds();\n    if (timeDelta >= this.RESUME_TOKEN_MAX_AGE_MICROS) {\n      return true;\n    }\n\n    // Otherwise if the only thing that has changed about a target is its resume\n    // token it's not worth persisting. Note that the RemoteStore keeps an\n    // in-memory view of the currently active targets which includes the current\n    // resume token, so stream failure or user changes will still use an\n    // up-to-date resume token regardless of what we do here.\n    const changes =\n      change.addedDocuments.size +\n      change.modifiedDocuments.size +\n      change.removedDocuments.size;\n    return changes > 0;\n  }\n\n  /**\n   * Notify local store of the changed views to locally pin documents.\n   */\n  async notifyLocalViewChanges(viewChanges: LocalViewChanges[]): Promise<void> {\n    try {\n      await this.persistence.runTransaction(\n        'notifyLocalViewChanges',\n        'readwrite',\n        txn => {\n          return PersistencePromise.forEach(\n            viewChanges,\n            (viewChange: LocalViewChanges) => {\n              return PersistencePromise.forEach(\n                viewChange.addedKeys,\n                (key: DocumentKey) =>\n                  this.persistence.referenceDelegate.addReference(\n                    txn,\n                    viewChange.targetId,\n                    key\n                  )\n              ).next(() =>\n                PersistencePromise.forEach(\n                  viewChange.removedKeys,\n                  (key: DocumentKey) =>\n                    this.persistence.referenceDelegate.removeReference(\n                      txn,\n                      viewChange.targetId,\n                      key\n                    )\n                )\n              );\n            }\n          );\n        }\n      );\n    } catch (e) {\n      if (isIndexedDbTransactionError(e)) {\n        // If `notifyLocalViewChanges` fails, we did not advance the sequence\n        // number for the documents that were included in this transaction.\n        // This might trigger them to be deleted earlier than they otherwise\n        // would have, but it should not invalidate the integrity of the data.\n        logDebug(LOG_TAG, 'Failed to update sequence numbers: ' + e);\n      } else {\n        throw e;\n      }\n    }\n\n    for (const viewChange of viewChanges) {\n      const targetId = viewChange.targetId;\n\n      if (!viewChange.fromCache) {\n        const targetData = this.targetDataByTarget.get(targetId);\n        debugAssert(\n          targetData !== null,\n          `Can't set limbo-free snapshot version for unknown target: ${targetId}`\n        );\n\n        // Advance the last limbo free snapshot version\n        const lastLimboFreeSnapshotVersion = targetData.snapshotVersion;\n        const updatedTargetData = targetData.withLastLimboFreeSnapshotVersion(\n          lastLimboFreeSnapshotVersion\n        );\n        this.targetDataByTarget = this.targetDataByTarget.insert(\n          targetId,\n          updatedTargetData\n        );\n      }\n    }\n  }\n\n  /**\n   * Gets the mutation batch after the passed in batchId in the mutation queue\n   * or null if empty.\n   * @param afterBatchId If provided, the batch to search after.\n   * @returns The next mutation or null if there wasn't one.\n   */\n  nextMutationBatch(afterBatchId?: BatchId): Promise<MutationBatch | null> {\n    return this.persistence.runTransaction(\n      'Get next mutation batch',\n      'readonly',\n      txn => {\n        if (afterBatchId === undefined) {\n          afterBatchId = BATCHID_UNKNOWN;\n        }\n        return this.mutationQueue.getNextMutationBatchAfterBatchId(\n          txn,\n          afterBatchId\n        );\n      }\n    );\n  }\n\n  /**\n   * Read the current value of a Document with a given key or null if not\n   * found - used for testing.\n   */\n  readDocument(key: DocumentKey): Promise<MaybeDocument | null> {\n    return this.persistence.runTransaction('read document', 'readonly', txn => {\n      return this.localDocuments.getDocument(txn, key);\n    });\n  }\n\n  /**\n   * Assigns the given target an internal ID so that its results can be pinned so\n   * they don't get GC'd. A target must be allocated in the local store before\n   * the store can be used to manage its view.\n   *\n   * Allocating an already allocated `Target` will return the existing `TargetData`\n   * for that `Target`.\n   */\n  allocateTarget(target: Target): Promise<TargetData> {\n    return this.persistence\n      .runTransaction('Allocate target', 'readwrite', txn => {\n        let targetData: TargetData;\n        return this.targetCache\n          .getTargetData(txn, target)\n          .next((cached: TargetData | null) => {\n            if (cached) {\n              // This target has been listened to previously, so reuse the\n              // previous targetID.\n              // TODO(mcg): freshen last accessed date?\n              targetData = cached;\n              return PersistencePromise.resolve(targetData);\n            } else {\n              return this.targetCache.allocateTargetId(txn).next(targetId => {\n                targetData = new TargetData(\n                  target,\n                  targetId,\n                  TargetPurpose.Listen,\n                  txn.currentSequenceNumber\n                );\n                return this.targetCache\n                  .addTargetData(txn, targetData)\n                  .next(() => targetData);\n              });\n            }\n          });\n      })\n      .then(targetData => {\n        if (this.targetDataByTarget.get(targetData.targetId) === null) {\n          this.targetDataByTarget = this.targetDataByTarget.insert(\n            targetData.targetId,\n            targetData\n          );\n          this.targetIdByTarget.set(target, targetData.targetId);\n        }\n        return targetData;\n      });\n  }\n\n  /**\n   * Returns the TargetData as seen by the LocalStore, including updates that may\n   * have not yet been persisted to the TargetCache.\n   */\n  // Visible for testing.\n  getTargetData(\n    transaction: PersistenceTransaction,\n    target: Target\n  ): PersistencePromise<TargetData | null> {\n    const targetId = this.targetIdByTarget.get(target);\n    if (targetId !== undefined) {\n      return PersistencePromise.resolve<TargetData | null>(\n        this.targetDataByTarget.get(targetId)\n      );\n    } else {\n      return this.targetCache.getTargetData(transaction, target);\n    }\n  }\n\n  /**\n   * Unpin all the documents associated with the given target. If\n   * `keepPersistedTargetData` is set to false and Eager GC enabled, the method\n   * directly removes the associated target data from the target cache.\n   *\n   * Releasing a non-existing `Target` is a no-op.\n   */\n  // PORTING NOTE: `keepPersistedTargetData` is multi-tab only.\n  releaseTarget(\n    targetId: number,\n    keepPersistedTargetData: boolean\n  ): Promise<void> {\n    const targetData = this.targetDataByTarget.get(targetId);\n    debugAssert(\n      targetData !== null,\n      `Tried to release nonexistent target: ${targetId}`\n    );\n\n    const mode = keepPersistedTargetData ? 'readwrite' : 'readwrite-primary';\n    return this.persistence\n      .runTransaction('Release target', mode, txn => {\n        if (!keepPersistedTargetData) {\n          return this.persistence.referenceDelegate.removeTarget(\n            txn,\n            targetData!\n          );\n        } else {\n          return PersistencePromise.resolve();\n        }\n      })\n      .then(() => {\n        this.targetDataByTarget = this.targetDataByTarget.remove(targetId);\n        this.targetIdByTarget.delete(targetData!.target);\n      });\n  }\n\n  /**\n   * Runs the specified query against the local store and returns the results,\n   * potentially taking advantage of query data from previous executions (such\n   * as the set of remote keys).\n   *\n   * @param usePreviousResults Whether results from previous executions can\n   * be used to optimize this query execution.\n   */\n  executeQuery(\n    query: Query,\n    usePreviousResults: boolean\n  ): Promise<QueryResult> {\n    let lastLimboFreeSnapshotVersion = SnapshotVersion.min();\n    let remoteKeys = documentKeySet();\n\n    return this.persistence.runTransaction('Execute query', 'readonly', txn => {\n      return this.getTargetData(txn, query.toTarget())\n        .next(targetData => {\n          if (targetData) {\n            lastLimboFreeSnapshotVersion =\n              targetData.lastLimboFreeSnapshotVersion;\n            return this.targetCache\n              .getMatchingKeysForTargetId(txn, targetData.targetId)\n              .next(result => {\n                remoteKeys = result;\n              });\n          }\n        })\n        .next(() =>\n          this.queryEngine.getDocumentsMatchingQuery(\n            txn,\n            query,\n            usePreviousResults\n              ? lastLimboFreeSnapshotVersion\n              : SnapshotVersion.min(),\n            usePreviousResults ? remoteKeys : documentKeySet()\n          )\n        )\n        .next(documents => {\n          return { documents, remoteKeys };\n        });\n    });\n  }\n\n  private applyWriteToRemoteDocuments(\n    txn: PersistenceTransaction,\n    batchResult: MutationBatchResult,\n    documentBuffer: RemoteDocumentChangeBuffer\n  ): PersistencePromise<void> {\n    const batch = batchResult.batch;\n    const docKeys = batch.keys();\n    let promiseChain = PersistencePromise.resolve();\n    docKeys.forEach(docKey => {\n      promiseChain = promiseChain\n        .next(() => {\n          return documentBuffer.getEntry(txn, docKey);\n        })\n        .next((remoteDoc: MaybeDocument | null) => {\n          let doc = remoteDoc;\n          const ackVersion = batchResult.docVersions.get(docKey);\n          hardAssert(\n            ackVersion !== null,\n            'ackVersions should contain every doc in the write.'\n          );\n          if (!doc || doc.version.compareTo(ackVersion!) < 0) {\n            doc = batch.applyToRemoteDocument(docKey, doc, batchResult);\n            if (!doc) {\n              debugAssert(\n                !remoteDoc,\n                'Mutation batch ' +\n                  batch +\n                  ' applied to document ' +\n                  remoteDoc +\n                  ' resulted in null'\n              );\n            } else {\n              // We use the commitVersion as the readTime rather than the\n              // document's updateTime since the updateTime is not advanced\n              // for updates that do not modify the underlying document.\n              documentBuffer.addEntry(doc, batchResult.commitVersion);\n            }\n          }\n        });\n    });\n    return promiseChain.next(() =>\n      this.mutationQueue.removeMutationBatch(txn, batch)\n    );\n  }\n\n  collectGarbage(garbageCollector: LruGarbageCollector): Promise<LruResults> {\n    return this.persistence.runTransaction(\n      'Collect garbage',\n      'readwrite-primary',\n      txn => garbageCollector.collect(txn, this.targetDataByTarget)\n    );\n  }\n}\n\n/**\n * An implementation of LocalStore that provides additional functionality\n * for MultiTabSyncEngine.\n */\n// PORTING NOTE: Web only.\nexport class MultiTabLocalStore extends LocalStore {\n  protected mutationQueue: IndexedDbMutationQueue;\n  protected remoteDocuments: IndexedDbRemoteDocumentCache;\n  protected targetCache: IndexedDbTargetCache;\n\n  constructor(\n    protected persistence: IndexedDbPersistence,\n    queryEngine: QueryEngine,\n    initialUser: User\n  ) {\n    super(persistence, queryEngine, initialUser);\n\n    this.mutationQueue = persistence.getMutationQueue(initialUser);\n    this.remoteDocuments = persistence.getRemoteDocumentCache();\n    this.targetCache = persistence.getTargetCache();\n  }\n\n  /** Starts the LocalStore. */\n  start(): Promise<void> {\n    return this.synchronizeLastDocumentChangeReadTime();\n  }\n\n  /** Returns the local view of the documents affected by a mutation batch. */\n  lookupMutationDocuments(batchId: BatchId): Promise<MaybeDocumentMap | null> {\n    return this.persistence.runTransaction(\n      'Lookup mutation documents',\n      'readonly',\n      txn => {\n        return this.mutationQueue\n          .lookupMutationKeys(txn, batchId)\n          .next(keys => {\n            if (keys) {\n              return this.localDocuments.getDocuments(\n                txn,\n                keys\n              ) as PersistencePromise<MaybeDocumentMap | null>;\n            } else {\n              return PersistencePromise.resolve<MaybeDocumentMap | null>(null);\n            }\n          });\n      }\n    );\n  }\n\n  removeCachedMutationBatchMetadata(batchId: BatchId): void {\n    this.mutationQueue.removeCachedMutationKeys(batchId);\n  }\n\n  setNetworkEnabled(networkEnabled: boolean): void {\n    this.persistence.setNetworkEnabled(networkEnabled);\n  }\n\n  getActiveClients(): Promise<ClientId[]> {\n    return this.persistence.getActiveClients();\n  }\n\n  getTarget(targetId: TargetId): Promise<Target | null> {\n    const cachedTargetData = this.targetDataByTarget.get(targetId);\n\n    if (cachedTargetData) {\n      return Promise.resolve(cachedTargetData.target);\n    } else {\n      return this.persistence.runTransaction(\n        'Get target data',\n        'readonly',\n        txn => {\n          return this.targetCache\n            .getTargetDataForTarget(txn, targetId)\n            .next(targetData => (targetData ? targetData.target : null));\n        }\n      );\n    }\n  }\n\n  /**\n   * Returns the set of documents that have been updated since the last call.\n   * If this is the first call, returns the set of changes since client\n   * initialization. Further invocations will return document changes since\n   * the point of rejection.\n   */\n  getNewDocumentChanges(): Promise<MaybeDocumentMap> {\n    return this.persistence\n      .runTransaction('Get new document changes', 'readonly', txn =>\n        this.remoteDocuments.getNewDocumentChanges(\n          txn,\n          this.lastDocumentChangeReadTime\n        )\n      )\n      .then(({ changedDocs, readTime }) => {\n        this.lastDocumentChangeReadTime = readTime;\n        return changedDocs;\n      });\n  }\n\n  /**\n   * Reads the newest document change from persistence and forwards the internal\n   * synchronization marker so that calls to `getNewDocumentChanges()`\n   * only return changes that happened after client initialization.\n   */\n  async synchronizeLastDocumentChangeReadTime(): Promise<void> {\n    this.lastDocumentChangeReadTime = await this.persistence.runTransaction(\n      'Synchronize last document change read time',\n      'readonly',\n      txn => this.remoteDocuments.getLastReadTime(txn)\n    );\n  }\n}\n\n/**\n * Verifies the error thrown by a LocalStore operation. If a LocalStore\n * operation fails because the primary lease has been taken by another client,\n * we ignore the error (the persistence layer will immediately call\n * `applyPrimaryLease` to propagate the primary state change). All other errors\n * are re-thrown.\n *\n * @param err An error returned by a LocalStore operation.\n * @return A Promise that resolves after we recovered, or the original error.\n */\nexport async function ignoreIfPrimaryLeaseLoss(\n  err: FirestoreError\n): Promise<void> {\n  if (\n    err.code === Code.FAILED_PRECONDITION &&\n    err.message === PRIMARY_LEASE_LOST_ERROR_MSG\n  ) {\n    logDebug(LOG_TAG, 'Unexpectedly lost primary lease');\n  } else {\n    throw err;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { BatchId, TargetId } from '../core/types';\nimport { documentKeySet, DocumentKeySet } from '../model/collections';\nimport { DocumentKey } from '../model/document_key';\nimport { primitiveComparator } from '../util/misc';\nimport { SortedSet } from '../util/sorted_set';\n\n/**\n * A collection of references to a document from some kind of numbered entity\n * (either a target ID or batch ID). As references are added to or removed from\n * the set corresponding events are emitted to a registered garbage collector.\n *\n * Each reference is represented by a DocumentReference object. Each of them\n * contains enough information to uniquely identify the reference. They are all\n * stored primarily in a set sorted by key. A document is considered garbage if\n * there's no references in that set (this can be efficiently checked thanks to\n * sorting by key).\n *\n * ReferenceSet also keeps a secondary set that contains references sorted by\n * IDs. This one is used to efficiently implement removal of all references by\n * some target ID.\n */\nexport class ReferenceSet {\n  // A set of outstanding references to a document sorted by key.\n  private refsByKey = new SortedSet(DocReference.compareByKey);\n\n  // A set of outstanding references to a document sorted by target id.\n  private refsByTarget = new SortedSet(DocReference.compareByTargetId);\n\n  /** Returns true if the reference set contains no references. */\n  isEmpty(): boolean {\n    return this.refsByKey.isEmpty();\n  }\n\n  /** Adds a reference to the given document key for the given ID. */\n  addReference(key: DocumentKey, id: TargetId | BatchId): void {\n    const ref = new DocReference(key, id);\n    this.refsByKey = this.refsByKey.add(ref);\n    this.refsByTarget = this.refsByTarget.add(ref);\n  }\n\n  /** Add references to the given document keys for the given ID. */\n  addReferences(keys: DocumentKeySet, id: TargetId | BatchId): void {\n    keys.forEach(key => this.addReference(key, id));\n  }\n\n  /**\n   * Removes a reference to the given document key for the given\n   * ID.\n   */\n  removeReference(key: DocumentKey, id: TargetId | BatchId): void {\n    this.removeRef(new DocReference(key, id));\n  }\n\n  removeReferences(keys: DocumentKeySet, id: TargetId | BatchId): void {\n    keys.forEach(key => this.removeReference(key, id));\n  }\n\n  /**\n   * Clears all references with a given ID. Calls removeRef() for each key\n   * removed.\n   */\n  removeReferencesForId(id: TargetId | BatchId): DocumentKey[] {\n    const emptyKey = DocumentKey.EMPTY;\n    const startRef = new DocReference(emptyKey, id);\n    const endRef = new DocReference(emptyKey, id + 1);\n    const keys: DocumentKey[] = [];\n    this.refsByTarget.forEachInRange([startRef, endRef], ref => {\n      this.removeRef(ref);\n      keys.push(ref.key);\n    });\n    return keys;\n  }\n\n  removeAllReferences(): void {\n    this.refsByKey.forEach(ref => this.removeRef(ref));\n  }\n\n  private removeRef(ref: DocReference): void {\n    this.refsByKey = this.refsByKey.delete(ref);\n    this.refsByTarget = this.refsByTarget.delete(ref);\n  }\n\n  referencesForId(id: TargetId | BatchId): DocumentKeySet {\n    const emptyKey = DocumentKey.EMPTY;\n    const startRef = new DocReference(emptyKey, id);\n    const endRef = new DocReference(emptyKey, id + 1);\n    let keys = documentKeySet();\n    this.refsByTarget.forEachInRange([startRef, endRef], ref => {\n      keys = keys.add(ref.key);\n    });\n    return keys;\n  }\n\n  containsKey(key: DocumentKey): boolean {\n    const ref = new DocReference(key, 0);\n    const firstRef = this.refsByKey.firstAfterOrEqual(ref);\n    return firstRef !== null && key.isEqual(firstRef.key);\n  }\n}\n\nexport class DocReference {\n  constructor(\n    public key: DocumentKey,\n    public targetOrBatchId: TargetId | BatchId\n  ) {}\n\n  /** Compare by key then by ID */\n  static compareByKey(left: DocReference, right: DocReference): number {\n    return (\n      DocumentKey.comparator(left.key, right.key) ||\n      primitiveComparator(left.targetOrBatchId, right.targetOrBatchId)\n    );\n  }\n\n  /** Compare by ID then by key */\n  static compareByTargetId(left: DocReference, right: DocReference): number {\n    return (\n      primitiveComparator(left.targetOrBatchId, right.targetOrBatchId) ||\n      DocumentKey.comparator(left.key, right.key)\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\nimport { fail } from './assert';\nimport { Code, FirestoreError } from './error';\nimport { Dict, forEach } from './obj';\n\n/** Types accepted by validateType() and related methods for validation. */\nexport type ValidationType =\n  | 'undefined'\n  | 'object'\n  | 'function'\n  | 'boolean'\n  | 'number'\n  | 'string'\n  | 'non-empty string';\n\n/**\n * Validates that no arguments were passed in the invocation of functionName.\n *\n * Forward the magic \"arguments\" variable as second parameter on which the\n * parameter validation is performed:\n * validateNoArgs('myFunction', arguments);\n */\nexport function validateNoArgs(functionName: string, args: IArguments): void {\n  if (args.length !== 0) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() does not support arguments, ` +\n        'but was called with ' +\n        formatPlural(args.length, 'argument') +\n        '.'\n    );\n  }\n}\n\n/**\n * Validates the invocation of functionName has the exact number of arguments.\n *\n * Forward the magic \"arguments\" variable as second parameter on which the\n * parameter validation is performed:\n * validateExactNumberOfArgs('myFunction', arguments, 2);\n */\nexport function validateExactNumberOfArgs(\n  functionName: string,\n  args: IArguments,\n  numberOfArgs: number\n): void {\n  if (args.length !== numberOfArgs) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() requires ` +\n        formatPlural(numberOfArgs, 'argument') +\n        ', but was called with ' +\n        formatPlural(args.length, 'argument') +\n        '.'\n    );\n  }\n}\n\n/**\n * Validates the invocation of functionName has at least the provided number of\n * arguments (but can have many more).\n *\n * Forward the magic \"arguments\" variable as second parameter on which the\n * parameter validation is performed:\n * validateAtLeastNumberOfArgs('myFunction', arguments, 2);\n */\nexport function validateAtLeastNumberOfArgs(\n  functionName: string,\n  args: IArguments,\n  minNumberOfArgs: number\n): void {\n  if (args.length < minNumberOfArgs) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() requires at least ` +\n        formatPlural(minNumberOfArgs, 'argument') +\n        ', but was called with ' +\n        formatPlural(args.length, 'argument') +\n        '.'\n    );\n  }\n}\n\n/**\n * Validates the invocation of functionName has number of arguments between\n * the values provided.\n *\n * Forward the magic \"arguments\" variable as second parameter on which the\n * parameter validation is performed:\n * validateBetweenNumberOfArgs('myFunction', arguments, 2, 3);\n */\nexport function validateBetweenNumberOfArgs(\n  functionName: string,\n  args: IArguments,\n  minNumberOfArgs: number,\n  maxNumberOfArgs: number\n): void {\n  if (args.length < minNumberOfArgs || args.length > maxNumberOfArgs) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() requires between ${minNumberOfArgs} and ` +\n        `${maxNumberOfArgs} arguments, but was called with ` +\n        formatPlural(args.length, 'argument') +\n        '.'\n    );\n  }\n}\n\n/**\n * Validates the provided argument is an array and has as least the expected\n * number of elements.\n */\nexport function validateNamedArrayAtLeastNumberOfElements<T>(\n  functionName: string,\n  value: T[],\n  name: string,\n  minNumberOfElements: number\n): void {\n  if (!(value instanceof Array) || value.length < minNumberOfElements) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() requires its ${name} argument to be an ` +\n        'array with at least ' +\n        `${formatPlural(minNumberOfElements, 'element')}.`\n    );\n  }\n}\n\n/**\n * Validates the provided positional argument has the native JavaScript type\n * using typeof checks.\n */\nexport function validateArgType(\n  functionName: string,\n  type: ValidationType,\n  position: number,\n  argument: unknown\n): void {\n  validateType(functionName, type, `${ordinal(position)} argument`, argument);\n}\n\n/**\n * Validates the provided argument has the native JavaScript type using\n * typeof checks or is undefined.\n */\nexport function validateOptionalArgType(\n  functionName: string,\n  type: ValidationType,\n  position: number,\n  argument: unknown\n): void {\n  if (argument !== undefined) {\n    validateArgType(functionName, type, position, argument);\n  }\n}\n\n/**\n * Validates the provided named option has the native JavaScript type using\n * typeof checks.\n */\nexport function validateNamedType(\n  functionName: string,\n  type: ValidationType,\n  optionName: string,\n  argument: unknown\n): void {\n  validateType(functionName, type, `${optionName} option`, argument);\n}\n\n/**\n * Validates the provided named option has the native JavaScript type using\n * typeof checks or is undefined.\n */\nexport function validateNamedOptionalType(\n  functionName: string,\n  type: ValidationType,\n  optionName: string,\n  argument: unknown\n): void {\n  if (argument !== undefined) {\n    validateNamedType(functionName, type, optionName, argument);\n  }\n}\n\nexport function validateArrayElements<T>(\n  functionName: string,\n  optionName: string,\n  typeDescription: string,\n  argument: T[],\n  validator: (arg0: T) => boolean\n): void {\n  if (!(argument instanceof Array)) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() requires its ${optionName} ` +\n        `option to be an array, but it was: ${valueDescription(argument)}`\n    );\n  }\n\n  for (let i = 0; i < argument.length; ++i) {\n    if (!validator(argument[i])) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Function ${functionName}() requires all ${optionName} ` +\n          `elements to be ${typeDescription}, but the value at index ${i} ` +\n          `was: ${valueDescription(argument[i])}`\n      );\n    }\n  }\n}\n\nexport function validateOptionalArrayElements<T>(\n  functionName: string,\n  optionName: string,\n  typeDescription: string,\n  argument: T[] | undefined,\n  validator: (arg0: T) => boolean\n): void {\n  if (argument !== undefined) {\n    validateArrayElements(\n      functionName,\n      optionName,\n      typeDescription,\n      argument,\n      validator\n    );\n  }\n}\n\n/**\n * Validates that the provided named option equals one of the expected values.\n */\nexport function validateNamedPropertyEquals<T>(\n  functionName: string,\n  inputName: string,\n  optionName: string,\n  input: T,\n  expected: T[]\n): void {\n  const expectedDescription: string[] = [];\n\n  for (const val of expected) {\n    if (val === input) {\n      return;\n    }\n    expectedDescription.push(valueDescription(val));\n  }\n\n  const actualDescription = valueDescription(input);\n  throw new FirestoreError(\n    Code.INVALID_ARGUMENT,\n    `Invalid value ${actualDescription} provided to function ${functionName}() for option ` +\n      `\"${optionName}\". Acceptable values: ${expectedDescription.join(', ')}`\n  );\n}\n\n/**\n * Validates that the provided named option equals one of the expected values or\n * is undefined.\n */\nexport function validateNamedOptionalPropertyEquals<T>(\n  functionName: string,\n  inputName: string,\n  optionName: string,\n  input: T,\n  expected: T[]\n): void {\n  if (input !== undefined) {\n    validateNamedPropertyEquals(\n      functionName,\n      inputName,\n      optionName,\n      input,\n      expected\n    );\n  }\n}\n\n/**\n * Validates that the provided argument is a valid enum.\n *\n * @param functionName Function making the validation call.\n * @param enums Array containing all possible values for the enum.\n * @param position Position of the argument in `functionName`.\n * @param argument Argument to validate.\n * @return The value as T if the argument can be converted.\n */\nexport function validateStringEnum<T>(\n  functionName: string,\n  enums: T[],\n  position: number,\n  argument: unknown\n): T {\n  if (!enums.some(element => element === argument)) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Invalid value ${valueDescription(argument)} provided to function ` +\n        `${functionName}() for its ${ordinal(position)} argument. Acceptable ` +\n        `values: ${enums.join(', ')}`\n    );\n  }\n  return argument as T;\n}\n\n/** Helper to validate the type of a provided input. */\nfunction validateType(\n  functionName: string,\n  type: ValidationType,\n  inputName: string,\n  input: unknown\n): void {\n  let valid = false;\n  if (type === 'object') {\n    valid = isPlainObject(input);\n  } else if (type === 'non-empty string') {\n    valid = typeof input === 'string' && input !== '';\n  } else {\n    valid = typeof input === type;\n  }\n\n  if (!valid) {\n    const description = valueDescription(input);\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() requires its ${inputName} ` +\n        `to be of type ${type}, but it was: ${description}`\n    );\n  }\n}\n\n/**\n * Returns true if it's a non-null object without a custom prototype\n * (i.e. excludes Array, Date, etc.).\n */\nexport function isPlainObject(input: unknown): boolean {\n  return (\n    typeof input === 'object' &&\n    input !== null &&\n    (Object.getPrototypeOf(input) === Object.prototype ||\n      Object.getPrototypeOf(input) === null)\n  );\n}\n\n/** Returns a string describing the type / value of the provided input. */\nexport function valueDescription(input: unknown): string {\n  if (input === undefined) {\n    return 'undefined';\n  } else if (input === null) {\n    return 'null';\n  } else if (typeof input === 'string') {\n    if (input.length > 20) {\n      input = `${input.substring(0, 20)}...`;\n    }\n    return JSON.stringify(input);\n  } else if (typeof input === 'number' || typeof input === 'boolean') {\n    return '' + input;\n  } else if (typeof input === 'object') {\n    if (input instanceof Array) {\n      return 'an array';\n    } else {\n      const customObjectName = tryGetCustomObjectType(input!);\n      if (customObjectName) {\n        return `a custom ${customObjectName} object`;\n      } else {\n        return 'an object';\n      }\n    }\n  } else if (typeof input === 'function') {\n    return 'a function';\n  } else {\n    return fail('Unknown wrong type: ' + typeof input);\n  }\n}\n\n/** Hacky method to try to get the constructor name for an object. */\nexport function tryGetCustomObjectType(input: object): string | null {\n  if (input.constructor) {\n    const funcNameRegex = /function\\s+([^\\s(]+)\\s*\\(/;\n    const results = funcNameRegex.exec(input.constructor.toString());\n    if (results && results.length > 1) {\n      return results[1];\n    }\n  }\n  return null;\n}\n\n/** Validates the provided argument is defined. */\nexport function validateDefined(\n  functionName: string,\n  position: number,\n  argument: unknown\n): void {\n  if (argument === undefined) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() requires a valid ${ordinal(position)} ` +\n        `argument, but it was undefined.`\n    );\n  }\n}\n\n/**\n * Validates the provided positional argument is an object, and its keys and\n * values match the expected keys and types provided in optionTypes.\n */\nexport function validateOptionNames(\n  functionName: string,\n  options: object,\n  optionNames: string[]\n): void {\n  forEach(options as Dict<unknown>, (key, _) => {\n    if (optionNames.indexOf(key) < 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Unknown option '${key}' passed to function ${functionName}(). ` +\n          'Available options: ' +\n          optionNames.join(', ')\n      );\n    }\n  });\n}\n\n/**\n * Helper method to throw an error that the provided argument did not pass\n * an instanceof check.\n */\nexport function invalidClassError(\n  functionName: string,\n  type: string,\n  position: number,\n  argument: unknown\n): Error {\n  const description = valueDescription(argument);\n  return new FirestoreError(\n    Code.INVALID_ARGUMENT,\n    `Function ${functionName}() requires its ${ordinal(position)} ` +\n      `argument to be a ${type}, but it was: ${description}`\n  );\n}\n\nexport function validatePositiveNumber(\n  functionName: string,\n  position: number,\n  n: number\n): void {\n  if (n <= 0) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${functionName}() requires its ${ordinal(\n        position\n      )} argument to be a positive number, but it was: ${n}.`\n    );\n  }\n}\n\n/** Converts a number to its english word representation */\nfunction ordinal(num: number): string {\n  switch (num) {\n    case 1:\n      return 'first';\n    case 2:\n      return 'second';\n    case 3:\n      return 'third';\n    default:\n      return num + 'th';\n  }\n}\n\n/**\n * Formats the given word as plural conditionally given the preceding number.\n */\nfunction formatPlural(num: number, str: string): string {\n  return `${num} ${str}` + (num === 1 ? '' : 's');\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { PlatformSupport } from '../platform/platform';\nimport { Code, FirestoreError } from '../util/error';\nimport {\n  invalidClassError,\n  validateArgType,\n  validateExactNumberOfArgs\n} from '../util/input_validation';\nimport { ByteString } from '../util/byte_string';\n\n/** Helper function to assert Uint8Array is available at runtime. */\nfunction assertUint8ArrayAvailable(): void {\n  if (typeof Uint8Array === 'undefined') {\n    throw new FirestoreError(\n      Code.UNIMPLEMENTED,\n      'Uint8Arrays are not available in this environment.'\n    );\n  }\n}\n\n/** Helper function to assert Base64 functions are available at runtime. */\nfunction assertBase64Available(): void {\n  if (!PlatformSupport.getPlatform().base64Available) {\n    throw new FirestoreError(\n      Code.UNIMPLEMENTED,\n      'Blobs are unavailable in Firestore in this environment.'\n    );\n  }\n}\n\n/**\n * Immutable class holding a blob (binary data).\n * This class is directly exposed in the public API.\n *\n * Note that while you can't hide the constructor in JavaScript code, we are\n * using the hack above to make sure no-one outside this module can call it.\n */\nexport class Blob {\n  // Prefix with underscore to signal that we consider this not part of the\n  // public API and to prevent it from showing up for autocompletion.\n  _byteString: ByteString;\n\n  constructor(byteString: ByteString) {\n    assertBase64Available();\n    this._byteString = byteString;\n  }\n\n  static fromBase64String(base64: string): Blob {\n    validateExactNumberOfArgs('Blob.fromBase64String', arguments, 1);\n    validateArgType('Blob.fromBase64String', 'string', 1, base64);\n    assertBase64Available();\n    try {\n      return new Blob(ByteString.fromBase64String(base64));\n    } catch (e) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Failed to construct Blob from Base64 string: ' + e\n      );\n    }\n  }\n\n  static fromUint8Array(array: Uint8Array): Blob {\n    validateExactNumberOfArgs('Blob.fromUint8Array', arguments, 1);\n    assertUint8ArrayAvailable();\n    if (!(array instanceof Uint8Array)) {\n      throw invalidClassError('Blob.fromUint8Array', 'Uint8Array', 1, array);\n    }\n    return new Blob(ByteString.fromUint8Array(array));\n  }\n\n  toBase64(): string {\n    validateExactNumberOfArgs('Blob.toBase64', arguments, 0);\n    assertBase64Available();\n    return this._byteString.toBase64();\n  }\n\n  toUint8Array(): Uint8Array {\n    validateExactNumberOfArgs('Blob.toUint8Array', arguments, 0);\n    assertUint8ArrayAvailable();\n    return this._byteString.toUint8Array();\n  }\n\n  toString(): string {\n    return 'Blob(base64: ' + this.toBase64() + ')';\n  }\n\n  isEqual(other: Blob): boolean {\n    return this._byteString.isEqual(other._byteString);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as firestore from '@firebase/firestore-types';\n\nimport { FieldPath as InternalFieldPath } from '../model/path';\nimport { Code, FirestoreError } from '../util/error';\nimport {\n  invalidClassError,\n  validateArgType,\n  validateNamedArrayAtLeastNumberOfElements\n} from '../util/input_validation';\n\n// The objects that are a part of this API are exposed to third-parties as\n// compiled javascript so we want to flag our private members with a leading\n// underscore to discourage their use.\n\n/**\n * A FieldPath refers to a field in a document. The path may consist of a single\n * field name (referring to a top-level field in the document), or a list of\n * field names (referring to a nested field in the document).\n */\nexport class FieldPath implements firestore.FieldPath {\n  /** Internal representation of a Firestore field path. */\n  _internalPath: InternalFieldPath;\n\n  /**\n   * Creates a FieldPath from the provided field names. If more than one field\n   * name is provided, the path will point to a nested field in a document.\n   *\n   * @param fieldNames A list of field names.\n   */\n  constructor(...fieldNames: string[]) {\n    validateNamedArrayAtLeastNumberOfElements(\n      'FieldPath',\n      fieldNames,\n      'fieldNames',\n      1\n    );\n\n    for (let i = 0; i < fieldNames.length; ++i) {\n      validateArgType('FieldPath', 'string', i, fieldNames[i]);\n      if (fieldNames[i].length === 0) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          `Invalid field name at argument $(i + 1). ` +\n            'Field names must not be empty.'\n        );\n      }\n    }\n\n    this._internalPath = new InternalFieldPath(fieldNames);\n  }\n\n  /**\n   * Internal Note: The backend doesn't technically support querying by\n   * document ID. Instead it queries by the entire document name (full path\n   * included), but in the cases we currently support documentId(), the net\n   * effect is the same.\n   */\n  private static readonly _DOCUMENT_ID = new FieldPath(\n    InternalFieldPath.keyField().canonicalString()\n  );\n\n  static documentId(): FieldPath {\n    return FieldPath._DOCUMENT_ID;\n  }\n\n  isEqual(other: firestore.FieldPath): boolean {\n    if (!(other instanceof FieldPath)) {\n      throw invalidClassError('isEqual', 'FieldPath', 1, other);\n    }\n    return this._internalPath.isEqual(other._internalPath);\n  }\n}\n\n/**\n * Matches any characters in a field path string that are reserved.\n */\nconst RESERVED = new RegExp('[~\\\\*/\\\\[\\\\]]');\n\n/**\n * Parses a field path string into a FieldPath, treating dots as separators.\n */\nexport function fromDotSeparatedString(path: string): FieldPath {\n  const found = path.search(RESERVED);\n  if (found >= 0) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Invalid field path (${path}). Paths must not contain ` +\n        `'~', '*', '/', '[', or ']'`\n    );\n  }\n  try {\n    return new FieldPath(...path.split('.'));\n  } catch (e) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Invalid field path (${path}). Paths must not be empty, ` +\n        `begin with '.', end with '.', or contain '..'`\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as firestore from '@firebase/firestore-types';\nimport {\n  validateArgType,\n  validateAtLeastNumberOfArgs,\n  validateExactNumberOfArgs,\n  validateNoArgs\n} from '../util/input_validation';\nimport { FieldTransform } from '../model/mutation';\nimport {\n  ArrayRemoveTransformOperation,\n  ArrayUnionTransformOperation,\n  NumericIncrementTransformOperation,\n  ServerTimestampTransform\n} from '../model/transform_operation';\nimport { ParseContext, parseData, UserDataSource } from './user_data_reader';\nimport { debugAssert } from '../util/assert';\n\n/**\n * An opaque base class for FieldValue sentinel objects in our public API,\n * with public static methods for creating said sentinel objects.\n */\nexport abstract class FieldValueImpl {\n  protected constructor(readonly _methodName: string) {}\n\n  abstract toFieldTransform(context: ParseContext): FieldTransform | null;\n\n  abstract isEqual(other: FieldValue): boolean;\n}\n\nexport class DeleteFieldValueImpl extends FieldValueImpl {\n  constructor() {\n    super('FieldValue.delete');\n  }\n\n  toFieldTransform(context: ParseContext): null {\n    if (context.dataSource === UserDataSource.MergeSet) {\n      // No transform to add for a delete, but we need to add it to our\n      // fieldMask so it gets deleted.\n      context.fieldMask.push(context.path!);\n    } else if (context.dataSource === UserDataSource.Update) {\n      debugAssert(\n        context.path!.length > 0,\n        'FieldValue.delete() at the top level should have already' +\n          ' been handled.'\n      );\n      throw context.createError(\n        'FieldValue.delete() can only appear at the top level ' +\n          'of your update data'\n      );\n    } else {\n      // We shouldn't encounter delete sentinels for queries or non-merge set() calls.\n      throw context.createError(\n        'FieldValue.delete() cannot be used with set() unless you pass ' +\n          '{merge:true}'\n      );\n    }\n    return null;\n  }\n\n  isEqual(other: FieldValue): boolean {\n    return other instanceof DeleteFieldValueImpl;\n  }\n}\n\nexport class ServerTimestampFieldValueImpl extends FieldValueImpl {\n  constructor() {\n    super('FieldValue.serverTimestamp');\n  }\n\n  toFieldTransform(context: ParseContext): FieldTransform {\n    return new FieldTransform(context.path!, ServerTimestampTransform.instance);\n  }\n\n  isEqual(other: FieldValue): boolean {\n    return other instanceof ServerTimestampFieldValueImpl;\n  }\n}\n\nexport class ArrayUnionFieldValueImpl extends FieldValueImpl {\n  constructor(private readonly _elements: unknown[]) {\n    super('FieldValue.arrayUnion');\n  }\n\n  toFieldTransform(context: ParseContext): FieldTransform {\n    // Although array transforms are used with writes, the actual elements\n    // being uniomed or removed are not considered writes since they cannot\n    // contain any FieldValue sentinels, etc.\n    const parseContext = new ParseContext(\n      {\n        dataSource: UserDataSource.Argument,\n        methodName: this._methodName,\n        arrayElement: true\n      },\n      context.databaseId,\n      context.serializer,\n      context.ignoreUndefinedProperties\n    );\n    const parsedElements = this._elements.map(\n      element => parseData(element, parseContext)!\n    );\n    const arrayUnion = new ArrayUnionTransformOperation(parsedElements);\n    return new FieldTransform(context.path!, arrayUnion);\n  }\n\n  isEqual(other: FieldValue): boolean {\n    // TODO(mrschmidt): Implement isEquals\n    return this === other;\n  }\n}\n\nexport class ArrayRemoveFieldValueImpl extends FieldValueImpl {\n  constructor(readonly _elements: unknown[]) {\n    super('FieldValue.arrayRemove');\n  }\n\n  toFieldTransform(context: ParseContext): FieldTransform {\n    // Although array transforms are used with writes, the actual elements\n    // being unioned or removed are not considered writes since they cannot\n    // contain any FieldValue sentinels, etc.\n    const parseContext = new ParseContext(\n      {\n        dataSource: UserDataSource.Argument,\n        methodName: this._methodName,\n        arrayElement: true\n      },\n      context.databaseId,\n      context.serializer,\n      context.ignoreUndefinedProperties\n    );\n    const parsedElements = this._elements.map(\n      element => parseData(element, parseContext)!\n    );\n    const arrayUnion = new ArrayRemoveTransformOperation(parsedElements);\n    return new FieldTransform(context.path!, arrayUnion);\n  }\n\n  isEqual(other: FieldValue): boolean {\n    // TODO(mrschmidt): Implement isEquals\n    return this === other;\n  }\n}\n\nexport class NumericIncrementFieldValueImpl extends FieldValueImpl {\n  constructor(private readonly _operand: number) {\n    super('FieldValue.increment');\n  }\n\n  toFieldTransform(context: ParseContext): FieldTransform {\n    const parseContext = new ParseContext(\n      {\n        dataSource: UserDataSource.Argument,\n        methodName: this._methodName\n      },\n      context.databaseId,\n      context.serializer,\n      context.ignoreUndefinedProperties\n    );\n    const operand = parseData(this._operand, parseContext)!;\n    const numericIncrement = new NumericIncrementTransformOperation(\n      context.serializer,\n      operand\n    );\n    return new FieldTransform(context.path!, numericIncrement);\n  }\n\n  isEqual(other: FieldValue): boolean {\n    // TODO(mrschmidt): Implement isEquals\n    return this === other;\n  }\n}\n\nexport class FieldValue implements firestore.FieldValue {\n  static delete(): FieldValueImpl {\n    validateNoArgs('FieldValue.delete', arguments);\n    return new DeleteFieldValueImpl();\n  }\n\n  static serverTimestamp(): FieldValueImpl {\n    validateNoArgs('FieldValue.serverTimestamp', arguments);\n    return new ServerTimestampFieldValueImpl();\n  }\n\n  static arrayUnion(...elements: unknown[]): FieldValueImpl {\n    validateAtLeastNumberOfArgs('FieldValue.arrayUnion', arguments, 1);\n    // NOTE: We don't actually parse the data until it's used in set() or\n    // update() since we need access to the Firestore instance.\n    return new ArrayUnionFieldValueImpl(elements);\n  }\n\n  static arrayRemove(...elements: unknown[]): FieldValueImpl {\n    validateAtLeastNumberOfArgs('FieldValue.arrayRemove', arguments, 1);\n    // NOTE: We don't actually parse the data until it's used in set() or\n    // update() since we need access to the Firestore instance.\n    return new ArrayRemoveFieldValueImpl(elements);\n  }\n\n  static increment(n: number): FieldValueImpl {\n    validateArgType('FieldValue.increment', 'number', 1, n);\n    validateExactNumberOfArgs('FieldValue.increment', arguments, 1);\n    return new NumericIncrementFieldValueImpl(n);\n  }\n\n  isEqual(other: FieldValue): boolean {\n    return this === other;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Code, FirestoreError } from '../util/error';\nimport {\n  validateArgType,\n  validateExactNumberOfArgs\n} from '../util/input_validation';\nimport { primitiveComparator } from '../util/misc';\n\n/**\n * Immutable class representing a geo point as latitude-longitude pair.\n * This class is directly exposed in the public API, including its constructor.\n */\nexport class GeoPoint {\n  // Prefix with underscore to signal this is a private variable in JS and\n  // prevent it showing up for autocompletion when typing latitude or longitude.\n  private _lat: number;\n  private _long: number;\n\n  constructor(latitude: number, longitude: number) {\n    validateExactNumberOfArgs('GeoPoint', arguments, 2);\n    validateArgType('GeoPoint', 'number', 1, latitude);\n    validateArgType('GeoPoint', 'number', 2, longitude);\n    if (!isFinite(latitude) || latitude < -90 || latitude > 90) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Latitude must be a number between -90 and 90, but was: ' + latitude\n      );\n    }\n    if (!isFinite(longitude) || longitude < -180 || longitude > 180) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Longitude must be a number between -180 and 180, but was: ' + longitude\n      );\n    }\n\n    this._lat = latitude;\n    this._long = longitude;\n  }\n\n  /**\n   * Returns the latitude of this geo point, a number between -90 and 90.\n   */\n  get latitude(): number {\n    return this._lat;\n  }\n\n  /**\n   * Returns the longitude of this geo point, a number between -180 and 180.\n   */\n  get longitude(): number {\n    return this._long;\n  }\n\n  isEqual(other: GeoPoint): boolean {\n    return this._lat === other._lat && this._long === other._long;\n  }\n\n  /**\n   * Actually private to JS consumers of our API, so this function is prefixed\n   * with an underscore.\n   */\n  _compareTo(other: GeoPoint): number {\n    return (\n      primitiveComparator(this._lat, other._lat) ||\n      primitiveComparator(this._long, other._long)\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as firestore from '@firebase/firestore-types';\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { Timestamp } from './timestamp';\nimport { DatabaseId } from '../core/database_info';\nimport { DocumentKey } from '../model/document_key';\nimport {\n  FieldMask,\n  FieldTransform,\n  Mutation,\n  PatchMutation,\n  Precondition,\n  SetMutation,\n  TransformMutation\n} from '../model/mutation';\nimport { FieldPath } from '../model/path';\nimport { debugAssert, fail } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { isPlainObject, valueDescription } from '../util/input_validation';\nimport { Dict, forEach, isEmpty } from '../util/obj';\nimport { ObjectValue, ObjectValueBuilder } from '../model/object_value';\nimport { JsonProtoSerializer } from '../remote/serializer';\nimport { Blob } from './blob';\nimport {\n  FieldPath as ExternalFieldPath,\n  fromDotSeparatedString\n} from './field_path';\nimport { DeleteFieldValueImpl, FieldValueImpl } from './field_value';\nimport { GeoPoint } from './geo_point';\nimport { PlatformSupport } from '../platform/platform';\nimport { DocumentReference } from './database';\n\nconst RESERVED_FIELD_REGEX = /^__.*__$/;\n\n/** The result of parsing document data (e.g. for a setData call). */\nexport class ParsedSetData {\n  constructor(\n    readonly data: ObjectValue,\n    readonly fieldMask: FieldMask | null,\n    readonly fieldTransforms: FieldTransform[]\n  ) {}\n\n  toMutations(key: DocumentKey, precondition: Precondition): Mutation[] {\n    const mutations = [] as Mutation[];\n    if (this.fieldMask !== null) {\n      mutations.push(\n        new PatchMutation(key, this.data, this.fieldMask, precondition)\n      );\n    } else {\n      mutations.push(new SetMutation(key, this.data, precondition));\n    }\n    if (this.fieldTransforms.length > 0) {\n      mutations.push(new TransformMutation(key, this.fieldTransforms));\n    }\n    return mutations;\n  }\n}\n\n/** The result of parsing \"update\" data (i.e. for an updateData call). */\nexport class ParsedUpdateData {\n  constructor(\n    readonly data: ObjectValue,\n    readonly fieldMask: FieldMask,\n    readonly fieldTransforms: FieldTransform[]\n  ) {}\n\n  toMutations(key: DocumentKey, precondition: Precondition): Mutation[] {\n    const mutations = [\n      new PatchMutation(key, this.data, this.fieldMask, precondition)\n    ] as Mutation[];\n    if (this.fieldTransforms.length > 0) {\n      mutations.push(new TransformMutation(key, this.fieldTransforms));\n    }\n    return mutations;\n  }\n}\n\n/*\n * Represents what type of API method provided the data being parsed; useful\n * for determining which error conditions apply during parsing and providing\n * better error messages.\n */\nexport const enum UserDataSource {\n  Set,\n  Update,\n  MergeSet,\n  /**\n   * Indicates the source is a where clause, cursor bound, arrayUnion()\n   * element, etc. Of note, isWrite(source) will return false.\n   */\n  Argument,\n  /**\n   * Indicates that the source is an Argument that may directly contain nested\n   * arrays (e.g. the operand of an `in` query).\n   */\n  ArrayArgument\n}\n\nfunction isWrite(dataSource: UserDataSource): boolean {\n  switch (dataSource) {\n    case UserDataSource.Set: // fall through\n    case UserDataSource.MergeSet: // fall through\n    case UserDataSource.Update:\n      return true;\n    case UserDataSource.Argument:\n    case UserDataSource.ArrayArgument:\n      return false;\n    default:\n      throw fail(`Unexpected case for UserDataSource: ${dataSource}`);\n  }\n}\n\n/** Contains the settings that are mutated as we parse user data. */\ninterface ContextSettings {\n  /** Indicates what kind of API method this data came from. */\n  readonly dataSource: UserDataSource;\n  /** The name of the method the user called to create the ParseContext. */\n  readonly methodName: string;\n  /**\n   * A path within the object being parsed. This could be an empty path (in\n   * which case the context represents the root of the data being parsed), or a\n   * nonempty path (indicating the context represents a nested location within\n   * the data).\n   */\n  readonly path?: FieldPath;\n  /**\n   * Whether or not this context corresponds to an element of an array.\n   * If not set, elements are treated as if they were outside of arrays.\n   */\n  readonly arrayElement?: boolean;\n}\n\n/** A \"context\" object passed around while parsing user data. */\nexport class ParseContext {\n  readonly fieldTransforms: FieldTransform[];\n  readonly fieldMask: FieldPath[];\n  /**\n   * Initializes a ParseContext with the given source and path.\n   *\n   * @param settings The settings for the parser.\n   * @param databaseId The database ID of the Firestore instance.\n   * @param serializer The serializer to use to generate the Value proto.\n   * @param ignoreUndefinedProperties Whether to ignore undefined properties\n   * rather than throw.\n   * @param fieldTransforms A mutable list of field transforms encountered while\n   *     parsing the data.\n   * @param fieldMask A mutable list of field paths encountered while parsing\n   *     the data.\n   *\n   * TODO(b/34871131): We don't support array paths right now, so path can be\n   * null to indicate the context represents any location within an array (in\n   * which case certain features will not work and errors will be somewhat\n   * compromised).\n   */\n  constructor(\n    readonly settings: ContextSettings,\n    readonly databaseId: DatabaseId,\n    readonly serializer: JsonProtoSerializer,\n    readonly ignoreUndefinedProperties: boolean,\n    fieldTransforms?: FieldTransform[],\n    fieldMask?: FieldPath[]\n  ) {\n    // Minor hack: If fieldTransforms is undefined, we assume this is an\n    // external call and we need to validate the entire path.\n    if (fieldTransforms === undefined) {\n      this.validatePath();\n    }\n    this.fieldTransforms = fieldTransforms || [];\n    this.fieldMask = fieldMask || [];\n  }\n\n  get path(): FieldPath | undefined {\n    return this.settings.path;\n  }\n\n  get dataSource(): UserDataSource {\n    return this.settings.dataSource;\n  }\n\n  /** Returns a new context with the specified settings overwritten. */\n  contextWith(configuration: Partial<ContextSettings>): ParseContext {\n    return new ParseContext(\n      { ...this.settings, ...configuration },\n      this.databaseId,\n      this.serializer,\n      this.ignoreUndefinedProperties,\n      this.fieldTransforms,\n      this.fieldMask\n    );\n  }\n\n  childContextForField(field: string): ParseContext {\n    const childPath = this.path?.child(field);\n    const context = this.contextWith({ path: childPath, arrayElement: false });\n    context.validatePathSegment(field);\n    return context;\n  }\n\n  childContextForFieldPath(field: FieldPath): ParseContext {\n    const childPath = this.path?.child(field);\n    const context = this.contextWith({ path: childPath, arrayElement: false });\n    context.validatePath();\n    return context;\n  }\n\n  childContextForArray(index: number): ParseContext {\n    // TODO(b/34871131): We don't support array paths right now; so make path\n    // undefined.\n    return this.contextWith({ path: undefined, arrayElement: true });\n  }\n\n  createError(reason: string): Error {\n    const fieldDescription =\n      !this.path || this.path.isEmpty()\n        ? ''\n        : ` (found in field ${this.path.toString()})`;\n    return new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${this.settings.methodName}() called with invalid data. ` +\n        reason +\n        fieldDescription\n    );\n  }\n\n  /** Returns 'true' if 'fieldPath' was traversed when creating this context. */\n  contains(fieldPath: FieldPath): boolean {\n    return (\n      this.fieldMask.find(field => fieldPath.isPrefixOf(field)) !== undefined ||\n      this.fieldTransforms.find(transform =>\n        fieldPath.isPrefixOf(transform.field)\n      ) !== undefined\n    );\n  }\n\n  private validatePath(): void {\n    // TODO(b/34871131): Remove null check once we have proper paths for fields\n    // within arrays.\n    if (!this.path) {\n      return;\n    }\n    for (let i = 0; i < this.path.length; i++) {\n      this.validatePathSegment(this.path.get(i));\n    }\n  }\n\n  private validatePathSegment(segment: string): void {\n    if (segment.length === 0) {\n      throw this.createError('Document fields must not be empty');\n    }\n    if (isWrite(this.dataSource) && RESERVED_FIELD_REGEX.test(segment)) {\n      throw this.createError('Document fields cannot begin and end with \"__\"');\n    }\n  }\n}\n\n/**\n * Helper for parsing raw user input (provided via the API) into internal model\n * classes.\n */\nexport class UserDataReader {\n  private readonly serializer: JsonProtoSerializer;\n\n  constructor(\n    private readonly databaseId: DatabaseId,\n    private readonly ignoreUndefinedProperties: boolean,\n    serializer?: JsonProtoSerializer\n  ) {\n    this.serializer =\n      serializer || PlatformSupport.getPlatform().newSerializer(databaseId);\n  }\n\n  /** Parse document data from a non-merge set() call. */\n  parseSetData(methodName: string, input: unknown): ParsedSetData {\n    const context = this.createContext(UserDataSource.Set, methodName);\n    validatePlainObject('Data must be an object, but it was:', context, input);\n    const updateData = parseObject(input, context)!;\n\n    return new ParsedSetData(\n      new ObjectValue(updateData),\n      /* fieldMask= */ null,\n      context.fieldTransforms\n    );\n  }\n\n  /** Parse document data from a set() call with '{merge:true}'. */\n  parseMergeData(\n    methodName: string,\n    input: unknown,\n    fieldPaths?: Array<string | firestore.FieldPath>\n  ): ParsedSetData {\n    const context = this.createContext(UserDataSource.MergeSet, methodName);\n    validatePlainObject('Data must be an object, but it was:', context, input);\n    const updateData = parseObject(input, context);\n\n    let fieldMask: FieldMask;\n    let fieldTransforms: FieldTransform[];\n\n    if (!fieldPaths) {\n      fieldMask = new FieldMask(context.fieldMask);\n      fieldTransforms = context.fieldTransforms;\n    } else {\n      const validatedFieldPaths: FieldPath[] = [];\n\n      for (const stringOrFieldPath of fieldPaths) {\n        let fieldPath: FieldPath;\n\n        if (stringOrFieldPath instanceof ExternalFieldPath) {\n          fieldPath = stringOrFieldPath._internalPath;\n        } else if (typeof stringOrFieldPath === 'string') {\n          fieldPath = fieldPathFromDotSeparatedString(\n            methodName,\n            stringOrFieldPath\n          );\n        } else {\n          throw fail(\n            'Expected stringOrFieldPath to be a string or a FieldPath'\n          );\n        }\n\n        if (!context.contains(fieldPath)) {\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            `Field '${fieldPath}' is specified in your field mask but missing from your input data.`\n          );\n        }\n\n        if (!fieldMaskContains(validatedFieldPaths, fieldPath)) {\n          validatedFieldPaths.push(fieldPath);\n        }\n      }\n\n      fieldMask = new FieldMask(validatedFieldPaths);\n      fieldTransforms = context.fieldTransforms.filter(transform =>\n        fieldMask.covers(transform.field)\n      );\n    }\n    return new ParsedSetData(\n      new ObjectValue(updateData),\n      fieldMask,\n      fieldTransforms\n    );\n  }\n\n  /** Parse update data from an update() call. */\n  parseUpdateData(methodName: string, input: unknown): ParsedUpdateData {\n    const context = this.createContext(UserDataSource.Update, methodName);\n    validatePlainObject('Data must be an object, but it was:', context, input);\n\n    const fieldMaskPaths: FieldPath[] = [];\n    const updateData = new ObjectValueBuilder();\n    forEach(input as Dict<unknown>, (key, value) => {\n      const path = fieldPathFromDotSeparatedString(methodName, key);\n\n      const childContext = context.childContextForFieldPath(path);\n      if (value instanceof DeleteFieldValueImpl) {\n        // Add it to the field mask, but don't add anything to updateData.\n        fieldMaskPaths.push(path);\n      } else {\n        const parsedValue = parseData(value, childContext);\n        if (parsedValue != null) {\n          fieldMaskPaths.push(path);\n          updateData.set(path, parsedValue);\n        }\n      }\n    });\n\n    const mask = new FieldMask(fieldMaskPaths);\n    return new ParsedUpdateData(\n      updateData.build(),\n      mask,\n      context.fieldTransforms\n    );\n  }\n\n  /** Parse update data from a list of field/value arguments. */\n  parseUpdateVarargs(\n    methodName: string,\n    field: string | ExternalFieldPath,\n    value: unknown,\n    moreFieldsAndValues: unknown[]\n  ): ParsedUpdateData {\n    const context = this.createContext(UserDataSource.Update, methodName);\n    const keys = [fieldPathFromArgument(methodName, field)];\n    const values = [value];\n\n    if (moreFieldsAndValues.length % 2 !== 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Function ${methodName}() needs to be called with an even number ` +\n          'of arguments that alternate between field names and values.'\n      );\n    }\n\n    for (let i = 0; i < moreFieldsAndValues.length; i += 2) {\n      keys.push(\n        fieldPathFromArgument(\n          methodName,\n          moreFieldsAndValues[i] as string | ExternalFieldPath\n        )\n      );\n      values.push(moreFieldsAndValues[i + 1]);\n    }\n\n    const fieldMaskPaths: FieldPath[] = [];\n    const updateData = new ObjectValueBuilder();\n\n    // We iterate in reverse order to pick the last value for a field if the\n    // user specified the field multiple times.\n    for (let i = keys.length - 1; i >= 0; --i) {\n      if (!fieldMaskContains(fieldMaskPaths, keys[i])) {\n        const path = keys[i];\n        const value = values[i];\n        const childContext = context.childContextForFieldPath(path);\n        if (value instanceof DeleteFieldValueImpl) {\n          // Add it to the field mask, but don't add anything to updateData.\n          fieldMaskPaths.push(path);\n        } else {\n          const parsedValue = parseData(value, childContext);\n          if (parsedValue != null) {\n            fieldMaskPaths.push(path);\n            updateData.set(path, parsedValue);\n          }\n        }\n      }\n    }\n\n    const mask = new FieldMask(fieldMaskPaths);\n    return new ParsedUpdateData(\n      updateData.build(),\n      mask,\n      context.fieldTransforms\n    );\n  }\n\n  /** Creates a new top-level parse context. */\n  private createContext(\n    dataSource: UserDataSource,\n    methodName: string\n  ): ParseContext {\n    return new ParseContext(\n      {\n        dataSource,\n        methodName,\n        path: FieldPath.EMPTY_PATH,\n        arrayElement: false\n      },\n      this.databaseId,\n      this.serializer,\n      this.ignoreUndefinedProperties\n    );\n  }\n\n  /**\n   * Parse a \"query value\" (e.g. value in a where filter or a value in a cursor\n   * bound).\n   *\n   * @param allowArrays Whether the query value is an array that may directly\n   * contain additional arrays (e.g. the operand of an `in` query).\n   */\n  parseQueryValue(\n    methodName: string,\n    input: unknown,\n    allowArrays = false\n  ): api.Value {\n    const context = this.createContext(\n      allowArrays ? UserDataSource.ArrayArgument : UserDataSource.Argument,\n      methodName\n    );\n    const parsed = parseData(input, context);\n    debugAssert(parsed != null, 'Parsed data should not be null.');\n    debugAssert(\n      context.fieldTransforms.length === 0,\n      'Field transforms should have been disallowed.'\n    );\n    return parsed;\n  }\n}\n\n/**\n * Parses user data to Protobuf Values.\n *\n * @param input Data to be parsed.\n * @param context A context object representing the current path being parsed,\n * the source of the data being parsed, etc.\n * @return The parsed value, or null if the value was a FieldValue sentinel\n * that should not be included in the resulting parsed data.\n */\nexport function parseData(\n  input: unknown,\n  context: ParseContext\n): api.Value | null {\n  if (looksLikeJsonObject(input)) {\n    validatePlainObject('Unsupported field value:', context, input);\n    return parseObject(input, context);\n  } else if (input instanceof FieldValueImpl) {\n    // FieldValues usually parse into transforms (except FieldValue.delete())\n    // in which case we do not want to include this field in our parsed data\n    // (as doing so will overwrite the field directly prior to the transform\n    // trying to transform it). So we don't add this location to\n    // context.fieldMask and we return null as our parsing result.\n    parseSentinelFieldValue(input, context);\n    return null;\n  } else {\n    // If context.path is null we are inside an array and we don't support\n    // field mask paths more granular than the top-level array.\n    if (context.path) {\n      context.fieldMask.push(context.path);\n    }\n\n    if (input instanceof Array) {\n      // TODO(b/34871131): Include the path containing the array in the error\n      // message.\n      // In the case of IN queries, the parsed data is an array (representing\n      // the set of values to be included for the IN query) that may directly\n      // contain additional arrays (each representing an individual field\n      // value), so we disable this validation.\n      if (\n        context.settings.arrayElement &&\n        context.dataSource !== UserDataSource.ArrayArgument\n      ) {\n        throw context.createError('Nested arrays are not supported');\n      }\n      return parseArray(input as unknown[], context);\n    } else {\n      return parseScalarValue(input, context);\n    }\n  }\n}\n\nfunction parseObject(\n  obj: Dict<unknown>,\n  context: ParseContext\n): { mapValue: api.MapValue } {\n  const fields: Dict<api.Value> = {};\n\n  if (isEmpty(obj)) {\n    // If we encounter an empty object, we explicitly add it to the update\n    // mask to ensure that the server creates a map entry.\n    if (context.path && context.path.length > 0) {\n      context.fieldMask.push(context.path);\n    }\n  } else {\n    forEach(obj, (key: string, val: unknown) => {\n      const parsedValue = parseData(val, context.childContextForField(key));\n      if (parsedValue != null) {\n        fields[key] = parsedValue;\n      }\n    });\n  }\n\n  return { mapValue: { fields } };\n}\n\nfunction parseArray(array: unknown[], context: ParseContext): api.Value {\n  const values: api.Value[] = [];\n  let entryIndex = 0;\n  for (const entry of array) {\n    let parsedEntry = parseData(\n      entry,\n      context.childContextForArray(entryIndex)\n    );\n    if (parsedEntry == null) {\n      // Just include nulls in the array for fields being replaced with a\n      // sentinel.\n      parsedEntry = { nullValue: 'NULL_VALUE' };\n    }\n    values.push(parsedEntry);\n    entryIndex++;\n  }\n  return { arrayValue: { values } };\n}\n\n/**\n * \"Parses\" the provided FieldValueImpl, adding any necessary transforms to\n * context.fieldTransforms.\n */\nfunction parseSentinelFieldValue(\n  value: FieldValueImpl,\n  context: ParseContext\n): void {\n  // Sentinels are only supported with writes, and not within arrays.\n  if (!isWrite(context.dataSource)) {\n    throw context.createError(\n      `${value._methodName}() can only be used with update() and set()`\n    );\n  }\n  if (context.path === null) {\n    throw context.createError(\n      `${value._methodName}() is not currently supported inside arrays`\n    );\n  }\n\n  const fieldTransform = value.toFieldTransform(context);\n  if (fieldTransform) {\n    context.fieldTransforms.push(fieldTransform);\n  }\n}\n\n/**\n * Helper to parse a scalar value (i.e. not an Object, Array, or FieldValue)\n *\n * @return The parsed value\n */\nfunction parseScalarValue(\n  value: unknown,\n  context: ParseContext\n): api.Value | null {\n  if (value === null) {\n    return { nullValue: 'NULL_VALUE' };\n  } else if (typeof value === 'number') {\n    return context.serializer.toNumber(value);\n  } else if (typeof value === 'boolean') {\n    return { booleanValue: value };\n  } else if (typeof value === 'string') {\n    return { stringValue: value };\n  } else if (value instanceof Date) {\n    const timestamp = Timestamp.fromDate(value);\n    return { timestampValue: context.serializer.toTimestamp(timestamp) };\n  } else if (value instanceof Timestamp) {\n    // Firestore backend truncates precision down to microseconds. To ensure\n    // offline mode works the same with regards to truncation, perform the\n    // truncation immediately without waiting for the backend to do that.\n    const timestamp = new Timestamp(\n      value.seconds,\n      Math.floor(value.nanoseconds / 1000) * 1000\n    );\n    return { timestampValue: context.serializer.toTimestamp(timestamp) };\n  } else if (value instanceof GeoPoint) {\n    return {\n      geoPointValue: {\n        latitude: value.latitude,\n        longitude: value.longitude\n      }\n    };\n  } else if (value instanceof Blob) {\n    return { bytesValue: context.serializer.toBytes(value) };\n  } else if (value instanceof DocumentReference) {\n    const thisDb = context.databaseId;\n    const otherDb = value.firestore._databaseId;\n    if (!otherDb.isEqual(thisDb)) {\n      throw context.createError(\n        'Document reference is for database ' +\n          `${otherDb.projectId}/${otherDb.database} but should be ` +\n          `for database ${thisDb.projectId}/${thisDb.database}`\n      );\n    }\n    return {\n      referenceValue: context.serializer.toResourceName(\n        value._key.path,\n        value.firestore._databaseId\n      )\n    };\n  } else if (value === undefined && context.ignoreUndefinedProperties) {\n    return null;\n  } else {\n    throw context.createError(\n      `Unsupported field value: ${valueDescription(value)}`\n    );\n  }\n}\n\n/**\n * Checks whether an object looks like a JSON object that should be converted\n * into a struct. Normal class/prototype instances are considered to look like\n * JSON objects since they should be converted to a struct value. Arrays, Dates,\n * GeoPoints, etc. are not considered to look like JSON objects since they map\n * to specific FieldValue types other than ObjectValue.\n */\nfunction looksLikeJsonObject(input: unknown): boolean {\n  return (\n    typeof input === 'object' &&\n    input !== null &&\n    !(input instanceof Array) &&\n    !(input instanceof Date) &&\n    !(input instanceof Timestamp) &&\n    !(input instanceof GeoPoint) &&\n    !(input instanceof Blob) &&\n    !(input instanceof DocumentReference) &&\n    !(input instanceof FieldValueImpl)\n  );\n}\n\nfunction validatePlainObject(\n  message: string,\n  context: ParseContext,\n  input: unknown\n): asserts input is Dict<unknown> {\n  if (!looksLikeJsonObject(input) || !isPlainObject(input)) {\n    const description = valueDescription(input);\n    if (description === 'an object') {\n      // Massage the error if it was an object.\n      throw context.createError(message + ' a custom object');\n    } else {\n      throw context.createError(message + ' ' + description);\n    }\n  }\n}\n\n/**\n * Helper that calls fromDotSeparatedString() but wraps any error thrown.\n */\nexport function fieldPathFromArgument(\n  methodName: string,\n  path: string | ExternalFieldPath\n): FieldPath {\n  if (path instanceof ExternalFieldPath) {\n    return path._internalPath;\n  } else if (typeof path === 'string') {\n    return fieldPathFromDotSeparatedString(methodName, path);\n  } else {\n    const message = 'Field path arguments must be of type string or FieldPath.';\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${methodName}() called with invalid data. ${message}`\n    );\n  }\n}\n\n/**\n * Wraps fromDotSeparatedString with an error message about the method that\n * was thrown.\n * @param methodName The publicly visible method name\n * @param path The dot-separated string form of a field path which will be split\n * on dots.\n */\nfunction fieldPathFromDotSeparatedString(\n  methodName: string,\n  path: string\n): FieldPath {\n  try {\n    return fromDotSeparatedString(path)._internalPath;\n  } catch (e) {\n    const message = errorMessage(e);\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Function ${methodName}() called with invalid data. ${message}`\n    );\n  }\n}\n\n/**\n * Extracts the message from a caught exception, which should be an Error object\n * though JS doesn't guarantee that.\n */\nfunction errorMessage(error: Error | object): string {\n  return error instanceof Error ? error.message : error.toString();\n}\n\n/** Checks `haystack` if FieldPath `needle` is present. Runs in O(n). */\nfunction fieldMaskContains(haystack: FieldPath[], needle: FieldPath): boolean {\n  return haystack.some(v => v.isEqual(needle));\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { CredentialsProvider, Token } from '../api/credentials';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { TargetId } from '../core/types';\nimport { TargetData } from '../local/target_data';\nimport { Mutation, MutationResult } from '../model/mutation';\nimport * as api from '../protos/firestore_proto_api';\nimport { hardAssert, debugAssert } from '../util/assert';\nimport { AsyncQueue, DelayedOperation, TimerId } from '../util/async_queue';\nimport { Code, FirestoreError } from '../util/error';\nimport { logError, logDebug } from '../util/log';\n\nimport { isNullOrUndefined } from '../util/types';\nimport { ExponentialBackoff } from './backoff';\nimport { Connection, Stream } from './connection';\nimport { JsonProtoSerializer } from './serializer';\nimport { WatchChange } from './watch_change';\nimport { ByteString } from '../util/byte_string';\n\nconst LOG_TAG = 'PersistentStream';\n\n// The generated proto interfaces for these class are missing the database\n// field. So we add it here.\n// TODO(b/36015800): Remove this once the api generator is fixed.\ninterface ListenRequest extends api.ListenRequest {\n  database?: string;\n}\nexport interface WriteRequest extends api.WriteRequest {\n  database?: string;\n}\n/**\n * PersistentStream can be in one of 5 states (each described in detail below)\n * based on the following state transition diagram:\n *\n *          start() called             auth & connection succeeded\n * INITIAL ----------------> STARTING -----------------------------> OPEN\n *                             ^  |                                   |\n *                             |  |                    error occurred |\n *                             |  \\-----------------------------v-----/\n *                             |                                |\n *                    backoff  |                                |\n *                    elapsed  |              start() called    |\n *                             \\--- BACKOFF <---------------- ERROR\n *\n * [any state] --------------------------> INITIAL\n *               stop() called or\n *               idle timer expired\n */\nconst enum PersistentStreamState {\n  /**\n   * The streaming RPC is not yet running and there's no error condition.\n   * Calling start() will start the stream immediately without backoff.\n   * While in this state isStarted() will return false.\n   */\n  Initial,\n\n  /**\n   * The stream is starting, either waiting for an auth token or for the stream\n   * to successfully open. While in this state, isStarted() will return true but\n   * isOpen() will return false.\n   */\n  Starting,\n\n  /**\n   * The streaming RPC is up and running. Requests and responses can flow\n   * freely. Both isStarted() and isOpen() will return true.\n   */\n  Open,\n\n  /**\n   * The stream encountered an error. The next start attempt will back off.\n   * While in this state isStarted() will return false.\n   */\n  Error,\n\n  /**\n   * An in-between state after an error where the stream is waiting before\n   * re-starting. After waiting is complete, the stream will try to open.\n   * While in this state isStarted() will return true but isOpen() will return\n   * false.\n   */\n  Backoff\n}\n\n/**\n * Provides a common interface that is shared by the listeners for stream\n * events by the concrete implementation classes.\n */\nexport interface PersistentStreamListener {\n  /**\n   * Called after the stream was established and can accept outgoing\n   * messages\n   */\n  onOpen: () => Promise<void>;\n  /**\n   * Called after the stream has closed. If there was an error, the\n   * FirestoreError will be set.\n   */\n  onClose: (err?: FirestoreError) => Promise<void>;\n}\n\n/** The time a stream stays open after it is marked idle. */\nconst IDLE_TIMEOUT_MS = 60 * 1000;\n\n/**\n * A PersistentStream is an abstract base class that represents a streaming RPC\n * to the Firestore backend. It's built on top of the connections own support\n * for streaming RPCs, and adds several critical features for our clients:\n *\n *   - Exponential backoff on failure\n *   - Authentication via CredentialsProvider\n *   - Dispatching all callbacks into the shared worker queue\n *   - Closing idle streams after 60 seconds of inactivity\n *\n * Subclasses of PersistentStream implement serialization of models to and\n * from the JSON representation of the protocol buffers for a specific\n * streaming RPC.\n *\n * ## Starting and Stopping\n *\n * Streaming RPCs are stateful and need to be start()ed before messages can\n * be sent and received. The PersistentStream will call the onOpen() function\n * of the listener once the stream is ready to accept requests.\n *\n * Should a start() fail, PersistentStream will call the registered onClose()\n * listener with a FirestoreError indicating what went wrong.\n *\n * A PersistentStream can be started and stopped repeatedly.\n *\n * Generic types:\n *  SendType: The type of the outgoing message of the underlying\n *    connection stream\n *  ReceiveType: The type of the incoming message of the underlying\n *    connection stream\n *  ListenerType: The type of the listener that will be used for callbacks\n */\nexport abstract class PersistentStream<\n  SendType,\n  ReceiveType,\n  ListenerType extends PersistentStreamListener\n> {\n  private state = PersistentStreamState.Initial;\n  /**\n   * A close count that's incremented every time the stream is closed; used by\n   * getCloseGuardedDispatcher() to invalidate callbacks that happen after\n   * close.\n   */\n  private closeCount = 0;\n\n  private idleTimer: DelayedOperation<void> | null = null;\n  private stream: Stream<SendType, ReceiveType> | null = null;\n\n  protected backoff: ExponentialBackoff;\n\n  constructor(\n    private queue: AsyncQueue,\n    connectionTimerId: TimerId,\n    private idleTimerId: TimerId,\n    protected connection: Connection,\n    private credentialsProvider: CredentialsProvider,\n    protected listener: ListenerType\n  ) {\n    this.backoff = new ExponentialBackoff(queue, connectionTimerId);\n  }\n\n  /**\n   * Returns true if start() has been called and no error has occurred. True\n   * indicates the stream is open or in the process of opening (which\n   * encompasses respecting backoff, getting auth tokens, and starting the\n   * actual RPC). Use isOpen() to determine if the stream is open and ready for\n   * outbound requests.\n   */\n  isStarted(): boolean {\n    return (\n      this.state === PersistentStreamState.Starting ||\n      this.state === PersistentStreamState.Open ||\n      this.state === PersistentStreamState.Backoff\n    );\n  }\n\n  /**\n   * Returns true if the underlying RPC is open (the onOpen() listener has been\n   * called) and the stream is ready for outbound requests.\n   */\n  isOpen(): boolean {\n    return this.state === PersistentStreamState.Open;\n  }\n\n  /**\n   * Starts the RPC. Only allowed if isStarted() returns false. The stream is\n   * not immediately ready for use: onOpen() will be invoked when the RPC is\n   * ready for outbound requests, at which point isOpen() will return true.\n   *\n   * When start returns, isStarted() will return true.\n   */\n  start(): void {\n    if (this.state === PersistentStreamState.Error) {\n      this.performBackoff();\n      return;\n    }\n\n    debugAssert(\n      this.state === PersistentStreamState.Initial,\n      'Already started'\n    );\n    this.auth();\n  }\n\n  /**\n   * Stops the RPC. This call is idempotent and allowed regardless of the\n   * current isStarted() state.\n   *\n   * When stop returns, isStarted() and isOpen() will both return false.\n   */\n  async stop(): Promise<void> {\n    if (this.isStarted()) {\n      await this.close(PersistentStreamState.Initial);\n    }\n  }\n\n  /**\n   * After an error the stream will usually back off on the next attempt to\n   * start it. If the error warrants an immediate restart of the stream, the\n   * sender can use this to indicate that the receiver should not back off.\n   *\n   * Each error will call the onClose() listener. That function can decide to\n   * inhibit backoff if required.\n   */\n  inhibitBackoff(): void {\n    debugAssert(\n      !this.isStarted(),\n      'Can only inhibit backoff in a stopped state'\n    );\n\n    this.state = PersistentStreamState.Initial;\n    this.backoff.reset();\n  }\n\n  /**\n   * Marks this stream as idle. If no further actions are performed on the\n   * stream for one minute, the stream will automatically close itself and\n   * notify the stream's onClose() handler with Status.OK. The stream will then\n   * be in a !isStarted() state, requiring the caller to start the stream again\n   * before further use.\n   *\n   * Only streams that are in state 'Open' can be marked idle, as all other\n   * states imply pending network operations.\n   */\n  markIdle(): void {\n    // Starts the idle time if we are in state 'Open' and are not yet already\n    // running a timer (in which case the previous idle timeout still applies).\n    if (this.isOpen() && this.idleTimer === null) {\n      this.idleTimer = this.queue.enqueueAfterDelay(\n        this.idleTimerId,\n        IDLE_TIMEOUT_MS,\n        () => this.handleIdleCloseTimer()\n      );\n    }\n  }\n\n  /** Sends a message to the underlying stream. */\n  protected sendRequest(msg: SendType): void {\n    this.cancelIdleCheck();\n    this.stream!.send(msg);\n  }\n\n  /** Called by the idle timer when the stream should close due to inactivity. */\n  private async handleIdleCloseTimer(): Promise<void> {\n    if (this.isOpen()) {\n      // When timing out an idle stream there's no reason to force the stream into backoff when\n      // it restarts so set the stream state to Initial instead of Error.\n      return this.close(PersistentStreamState.Initial);\n    }\n  }\n\n  /** Marks the stream as active again. */\n  private cancelIdleCheck(): void {\n    if (this.idleTimer) {\n      this.idleTimer.cancel();\n      this.idleTimer = null;\n    }\n  }\n\n  /**\n   * Closes the stream and cleans up as necessary:\n   *\n   * * closes the underlying GRPC stream;\n   * * calls the onClose handler with the given 'error';\n   * * sets internal stream state to 'finalState';\n   * * adjusts the backoff timer based on the error\n   *\n   * A new stream can be opened by calling start().\n   *\n   * @param finalState the intended state of the stream after closing.\n   * @param error the error the connection was closed with.\n   */\n  private async close(\n    finalState: PersistentStreamState,\n    error?: FirestoreError\n  ): Promise<void> {\n    debugAssert(this.isStarted(), 'Only started streams should be closed.');\n    debugAssert(\n      finalState === PersistentStreamState.Error || isNullOrUndefined(error),\n      \"Can't provide an error when not in an error state.\"\n    );\n\n    // Cancel any outstanding timers (they're guaranteed not to execute).\n    this.cancelIdleCheck();\n    this.backoff.cancel();\n\n    // Invalidates any stream-related callbacks (e.g. from auth or the\n    // underlying stream), guaranteeing they won't execute.\n    this.closeCount++;\n\n    if (finalState !== PersistentStreamState.Error) {\n      // If this is an intentional close ensure we don't delay our next connection attempt.\n      this.backoff.reset();\n    } else if (error && error.code === Code.RESOURCE_EXHAUSTED) {\n      // Log the error. (Probably either 'quota exceeded' or 'max queue length reached'.)\n      logError(error.toString());\n      logError(\n        'Using maximum backoff delay to prevent overloading the backend.'\n      );\n      this.backoff.resetToMax();\n    } else if (error && error.code === Code.UNAUTHENTICATED) {\n      // \"unauthenticated\" error means the token was rejected. Try force refreshing it in case it\n      // just expired.\n      this.credentialsProvider.invalidateToken();\n    }\n\n    // Clean up the underlying stream because we are no longer interested in events.\n    if (this.stream !== null) {\n      this.tearDown();\n      this.stream.close();\n      this.stream = null;\n    }\n\n    // This state must be assigned before calling onClose() to allow the callback to\n    // inhibit backoff or otherwise manipulate the state in its non-started state.\n    this.state = finalState;\n\n    // Notify the listener that the stream closed.\n    await this.listener.onClose(error);\n  }\n\n  /**\n   * Can be overridden to perform additional cleanup before the stream is closed.\n   * Calling super.tearDown() is not required.\n   */\n  protected tearDown(): void {}\n\n  /**\n   * Used by subclasses to start the concrete RPC and return the underlying\n   * connection stream.\n   */\n  protected abstract startRpc(\n    token: Token | null\n  ): Stream<SendType, ReceiveType>;\n\n  /**\n   * Called after the stream has received a message. The function will be\n   * called on the right queue and must return a Promise.\n   * @param message The message received from the stream.\n   */\n  protected abstract onMessage(message: ReceiveType): Promise<void>;\n\n  private auth(): void {\n    debugAssert(\n      this.state === PersistentStreamState.Initial,\n      'Must be in initial state to auth'\n    );\n\n    this.state = PersistentStreamState.Starting;\n\n    const dispatchIfNotClosed = this.getCloseGuardedDispatcher(this.closeCount);\n\n    // TODO(mikelehen): Just use dispatchIfNotClosed, but see TODO below.\n    const closeCount = this.closeCount;\n\n    this.credentialsProvider.getToken().then(\n      token => {\n        // Stream can be stopped while waiting for authentication.\n        // TODO(mikelehen): We really should just use dispatchIfNotClosed\n        // and let this dispatch onto the queue, but that opened a spec test can\n        // of worms that I don't want to deal with in this PR.\n        if (this.closeCount === closeCount) {\n          // Normally we'd have to schedule the callback on the AsyncQueue.\n          // However, the following calls are safe to be called outside the\n          // AsyncQueue since they don't chain asynchronous calls\n          this.startStream(token);\n        }\n      },\n      (error: Error) => {\n        dispatchIfNotClosed(() => {\n          const rpcError = new FirestoreError(\n            Code.UNKNOWN,\n            'Fetching auth token failed: ' + error.message\n          );\n          return this.handleStreamClose(rpcError);\n        });\n      }\n    );\n  }\n\n  private startStream(token: Token | null): void {\n    debugAssert(\n      this.state === PersistentStreamState.Starting,\n      'Trying to start stream in a non-starting state'\n    );\n\n    const dispatchIfNotClosed = this.getCloseGuardedDispatcher(this.closeCount);\n\n    this.stream = this.startRpc(token);\n    this.stream.onOpen(() => {\n      dispatchIfNotClosed(() => {\n        debugAssert(\n          this.state === PersistentStreamState.Starting,\n          'Expected stream to be in state Starting, but was ' + this.state\n        );\n        this.state = PersistentStreamState.Open;\n        return this.listener!.onOpen();\n      });\n    });\n    this.stream.onClose((error?: FirestoreError) => {\n      dispatchIfNotClosed(() => {\n        return this.handleStreamClose(error);\n      });\n    });\n    this.stream.onMessage((msg: ReceiveType) => {\n      dispatchIfNotClosed(() => {\n        return this.onMessage(msg);\n      });\n    });\n  }\n\n  private performBackoff(): void {\n    debugAssert(\n      this.state === PersistentStreamState.Error,\n      'Should only perform backoff when in Error state'\n    );\n    this.state = PersistentStreamState.Backoff;\n\n    this.backoff.backoffAndRun(async () => {\n      debugAssert(\n        this.state === PersistentStreamState.Backoff,\n        'Backoff elapsed but state is now: ' + this.state\n      );\n\n      this.state = PersistentStreamState.Initial;\n      this.start();\n      debugAssert(this.isStarted(), 'PersistentStream should have started');\n    });\n  }\n\n  // Visible for tests\n  handleStreamClose(error?: FirestoreError): Promise<void> {\n    debugAssert(\n      this.isStarted(),\n      \"Can't handle server close on non-started stream\"\n    );\n    logDebug(LOG_TAG, `close with error: ${error}`);\n\n    this.stream = null;\n\n    // In theory the stream could close cleanly, however, in our current model\n    // we never expect this to happen because if we stop a stream ourselves,\n    // this callback will never be called. To prevent cases where we retry\n    // without a backoff accidentally, we set the stream to error in all cases.\n    return this.close(PersistentStreamState.Error, error);\n  }\n\n  /**\n   * Returns a \"dispatcher\" function that dispatches operations onto the\n   * AsyncQueue but only runs them if closeCount remains unchanged. This allows\n   * us to turn auth / stream callbacks into no-ops if the stream is closed /\n   * re-opened, etc.\n   */\n  private getCloseGuardedDispatcher(\n    startCloseCount: number\n  ): (fn: () => Promise<void>) => void {\n    return (fn: () => Promise<void>): void => {\n      this.queue.enqueueAndForget(() => {\n        if (this.closeCount === startCloseCount) {\n          return fn();\n        } else {\n          logDebug(\n            LOG_TAG,\n            'stream callback skipped by getCloseGuardedDispatcher.'\n          );\n          return Promise.resolve();\n        }\n      });\n    };\n  }\n}\n\n/** Listener for the PersistentWatchStream */\nexport interface WatchStreamListener extends PersistentStreamListener {\n  /**\n   * Called on a watchChange. The snapshot parameter will be MIN if the watch\n   * change did not have a snapshot associated with it.\n   */\n  onWatchChange: (\n    watchChange: WatchChange,\n    snapshot: SnapshotVersion\n  ) => Promise<void>;\n}\n\n/**\n * A PersistentStream that implements the Listen RPC.\n *\n * Once the Listen stream has called the onOpen() listener, any number of\n * listen() and unlisten() calls can be made to control what changes will be\n * sent from the server for ListenResponses.\n */\nexport class PersistentListenStream extends PersistentStream<\n  api.ListenRequest,\n  api.ListenResponse,\n  WatchStreamListener\n> {\n  constructor(\n    queue: AsyncQueue,\n    connection: Connection,\n    credentials: CredentialsProvider,\n    private serializer: JsonProtoSerializer,\n    listener: WatchStreamListener\n  ) {\n    super(\n      queue,\n      TimerId.ListenStreamConnectionBackoff,\n      TimerId.ListenStreamIdle,\n      connection,\n      credentials,\n      listener\n    );\n  }\n\n  protected startRpc(\n    token: Token | null\n  ): Stream<api.ListenRequest, api.ListenResponse> {\n    return this.connection.openStream<api.ListenRequest, api.ListenResponse>(\n      'Listen',\n      token\n    );\n  }\n\n  protected onMessage(watchChangeProto: api.ListenResponse): Promise<void> {\n    // A successful response means the stream is healthy\n    this.backoff.reset();\n\n    const watchChange = this.serializer.fromWatchChange(watchChangeProto);\n    const snapshot = this.serializer.versionFromListenResponse(\n      watchChangeProto\n    );\n    return this.listener!.onWatchChange(watchChange, snapshot);\n  }\n\n  /**\n   * Registers interest in the results of the given target. If the target\n   * includes a resumeToken it will be included in the request. Results that\n   * affect the target will be streamed back as WatchChange messages that\n   * reference the targetId.\n   */\n  watch(targetData: TargetData): void {\n    const request: ListenRequest = {};\n    request.database = this.serializer.encodedDatabaseId;\n    request.addTarget = this.serializer.toTarget(targetData);\n\n    const labels = this.serializer.toListenRequestLabels(targetData);\n    if (labels) {\n      request.labels = labels;\n    }\n\n    this.sendRequest(request);\n  }\n\n  /**\n   * Unregisters interest in the results of the target associated with the\n   * given targetId.\n   */\n  unwatch(targetId: TargetId): void {\n    const request: ListenRequest = {};\n    request.database = this.serializer.encodedDatabaseId;\n    request.removeTarget = targetId;\n    this.sendRequest(request);\n  }\n}\n\n/** Listener for the PersistentWriteStream */\nexport interface WriteStreamListener extends PersistentStreamListener {\n  /**\n   * Called by the PersistentWriteStream upon a successful handshake response\n   * from the server, which is the receiver's cue to send any pending writes.\n   */\n  onHandshakeComplete: () => Promise<void>;\n\n  /**\n   * Called by the PersistentWriteStream upon receiving a StreamingWriteResponse\n   * from the server that contains a mutation result.\n   */\n  onMutationResult: (\n    commitVersion: SnapshotVersion,\n    results: MutationResult[]\n  ) => Promise<void>;\n}\n\n/**\n * A Stream that implements the Write RPC.\n *\n * The Write RPC requires the caller to maintain special streamToken\n * state in between calls, to help the server understand which responses the\n * client has processed by the time the next request is made. Every response\n * will contain a streamToken; this value must be passed to the next\n * request.\n *\n * After calling start() on this stream, the next request must be a handshake,\n * containing whatever streamToken is on hand. Once a response to this\n * request is received, all pending mutations may be submitted. When\n * submitting multiple batches of mutations at the same time, it's\n * okay to use the same streamToken for the calls to writeMutations.\n *\n * TODO(b/33271235): Use proto types\n */\nexport class PersistentWriteStream extends PersistentStream<\n  api.WriteRequest,\n  api.WriteResponse,\n  WriteStreamListener\n> {\n  private handshakeComplete_ = false;\n\n  constructor(\n    queue: AsyncQueue,\n    connection: Connection,\n    credentials: CredentialsProvider,\n    private serializer: JsonProtoSerializer,\n    listener: WriteStreamListener\n  ) {\n    super(\n      queue,\n      TimerId.WriteStreamConnectionBackoff,\n      TimerId.WriteStreamIdle,\n      connection,\n      credentials,\n      listener\n    );\n  }\n\n  /**\n   * The last received stream token from the server, used to acknowledge which\n   * responses the client has processed. Stream tokens are opaque checkpoint\n   * markers whose only real value is their inclusion in the next request.\n   *\n   * PersistentWriteStream manages propagating this value from responses to the\n   * next request.\n   */\n  lastStreamToken: ByteString = ByteString.EMPTY_BYTE_STRING;\n\n  /**\n   * Tracks whether or not a handshake has been successfully exchanged and\n   * the stream is ready to accept mutations.\n   */\n  get handshakeComplete(): boolean {\n    return this.handshakeComplete_;\n  }\n\n  // Override of PersistentStream.start\n  start(): void {\n    this.handshakeComplete_ = false;\n    super.start();\n  }\n\n  protected tearDown(): void {\n    if (this.handshakeComplete_) {\n      this.writeMutations([]);\n    }\n  }\n\n  protected startRpc(\n    token: Token | null\n  ): Stream<api.WriteRequest, api.WriteResponse> {\n    return this.connection.openStream<api.WriteRequest, api.WriteResponse>(\n      'Write',\n      token\n    );\n  }\n\n  protected onMessage(responseProto: api.WriteResponse): Promise<void> {\n    // Always capture the last stream token.\n    hardAssert(\n      !!responseProto.streamToken,\n      'Got a write response without a stream token'\n    );\n    this.lastStreamToken = this.serializer.fromBytes(responseProto.streamToken);\n\n    if (!this.handshakeComplete_) {\n      // The first response is always the handshake response\n      hardAssert(\n        !responseProto.writeResults || responseProto.writeResults.length === 0,\n        'Got mutation results for handshake'\n      );\n      this.handshakeComplete_ = true;\n      return this.listener!.onHandshakeComplete();\n    } else {\n      // A successful first write response means the stream is healthy,\n      // Note, that we could consider a successful handshake healthy, however,\n      // the write itself might be causing an error we want to back off from.\n      this.backoff.reset();\n\n      const results = this.serializer.fromWriteResults(\n        responseProto.writeResults,\n        responseProto.commitTime\n      );\n      const commitVersion = this.serializer.fromVersion(\n        responseProto.commitTime!\n      );\n      return this.listener!.onMutationResult(commitVersion, results);\n    }\n  }\n\n  /**\n   * Sends an initial streamToken to the server, performing the handshake\n   * required to make the StreamingWrite RPC work. Subsequent\n   * calls should wait until onHandshakeComplete was called.\n   */\n  writeHandshake(): void {\n    debugAssert(this.isOpen(), 'Writing handshake requires an opened stream');\n    debugAssert(!this.handshakeComplete_, 'Handshake already completed');\n    // TODO(dimond): Support stream resumption. We intentionally do not set the\n    // stream token on the handshake, ignoring any stream token we might have.\n    const request: WriteRequest = {};\n    request.database = this.serializer.encodedDatabaseId;\n    this.sendRequest(request);\n  }\n\n  /** Sends a group of mutations to the Firestore backend to apply. */\n  writeMutations(mutations: Mutation[]): void {\n    debugAssert(this.isOpen(), 'Writing mutations requires an opened stream');\n    debugAssert(\n      this.handshakeComplete_,\n      'Handshake must be complete before writing mutations'\n    );\n    debugAssert(\n      this.lastStreamToken.approximateByteSize() > 0,\n      'Trying to write mutation without a token'\n    );\n\n    const request: WriteRequest = {\n      streamToken: this.serializer.toBytes(this.lastStreamToken),\n      writes: mutations.map(mutation => this.serializer.toMutation(mutation))\n    };\n\n    this.sendRequest(request);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { CredentialsProvider } from '../api/credentials';\nimport { MaybeDocument, Document } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { Mutation, MutationResult } from '../model/mutation';\nimport * as api from '../protos/firestore_proto_api';\nimport { debugCast, hardAssert } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { Connection } from './connection';\nimport { JsonProtoSerializer } from './serializer';\nimport {\n  PersistentListenStream,\n  PersistentWriteStream,\n  WatchStreamListener,\n  WriteStreamListener\n} from './persistent_stream';\nimport { AsyncQueue } from '../util/async_queue';\nimport { Query } from '../core/query';\n\n/**\n * Datastore and its related methods are a wrapper around the external Google\n * Cloud Datastore grpc API, which provides an interface that is more convenient\n * for the rest of the client SDK architecture to consume.\n */\nexport class Datastore {\n  // Make sure that the structural type of `Datastore` is unique.\n  // See https://github.com/microsoft/TypeScript/issues/5451\n  private _ = undefined;\n}\n\n/**\n * An implementation of Datastore that exposes additional state for internal\n * consumption.\n */\nclass DatastoreImpl extends Datastore {\n  constructor(\n    public readonly connection: Connection,\n    public readonly credentials: CredentialsProvider,\n    public readonly serializer: JsonProtoSerializer\n  ) {\n    super();\n  }\n\n  /** Gets an auth token and invokes the provided RPC. */\n  invokeRPC<Req, Resp>(rpcName: string, request: Req): Promise<Resp> {\n    return this.credentials\n      .getToken()\n      .then(token => {\n        return this.connection.invokeRPC<Req, Resp>(rpcName, request, token);\n      })\n      .catch((error: FirestoreError) => {\n        if (error.code === Code.UNAUTHENTICATED) {\n          this.credentials.invalidateToken();\n        }\n        throw error;\n      });\n  }\n\n  /** Gets an auth token and invokes the provided RPC with streamed results. */\n  invokeStreamingRPC<Req, Resp>(\n    rpcName: string,\n    request: Req\n  ): Promise<Resp[]> {\n    return this.credentials\n      .getToken()\n      .then(token => {\n        return this.connection.invokeStreamingRPC<Req, Resp>(\n          rpcName,\n          request,\n          token\n        );\n      })\n      .catch((error: FirestoreError) => {\n        if (error.code === Code.UNAUTHENTICATED) {\n          this.credentials.invalidateToken();\n        }\n        throw error;\n      });\n  }\n}\n\nexport function newDatastore(\n  connection: Connection,\n  credentials: CredentialsProvider,\n  serializer: JsonProtoSerializer\n): Datastore {\n  return new DatastoreImpl(connection, credentials, serializer);\n}\n\nexport async function invokeCommitRpc(\n  datastore: Datastore,\n  mutations: Mutation[]\n): Promise<MutationResult[]> {\n  const datastoreImpl = debugCast(datastore, DatastoreImpl);\n  const params = {\n    database: datastoreImpl.serializer.encodedDatabaseId,\n    writes: mutations.map(m => datastoreImpl.serializer.toMutation(m))\n  };\n  const response = await datastoreImpl.invokeRPC<\n    api.CommitRequest,\n    api.CommitResponse\n  >('Commit', params);\n  return datastoreImpl.serializer.fromWriteResults(\n    response.writeResults,\n    response.commitTime\n  );\n}\n\nexport async function invokeBatchGetDocumentsRpc(\n  datastore: Datastore,\n  keys: DocumentKey[]\n): Promise<MaybeDocument[]> {\n  const datastoreImpl = debugCast(datastore, DatastoreImpl);\n  const params = {\n    database: datastoreImpl.serializer.encodedDatabaseId,\n    documents: keys.map(k => datastoreImpl.serializer.toName(k))\n  };\n  const response = await datastoreImpl.invokeStreamingRPC<\n    api.BatchGetDocumentsRequest,\n    api.BatchGetDocumentsResponse\n  >('BatchGetDocuments', params);\n\n  const docs = new Map<string, MaybeDocument>();\n  response.forEach(proto => {\n    const doc = datastoreImpl.serializer.fromMaybeDocument(proto);\n    docs.set(doc.key.toString(), doc);\n  });\n  const result: MaybeDocument[] = [];\n  keys.forEach(key => {\n    const doc = docs.get(key.toString());\n    hardAssert(!!doc, 'Missing entity in write response for ' + key);\n    result.push(doc);\n  });\n  return result;\n}\n\nexport async function invokeRunQueryRpc(\n  datastore: Datastore,\n  query: Query\n): Promise<Document[]> {\n  const datastoreImpl = debugCast(datastore, DatastoreImpl);\n  const { structuredQuery, parent } = datastoreImpl.serializer.toQueryTarget(\n    query.toTarget()\n  );\n  const params = {\n    database: datastoreImpl.serializer.encodedDatabaseId,\n    parent,\n    structuredQuery\n  };\n\n  const response = await datastoreImpl.invokeStreamingRPC<\n    api.RunQueryRequest,\n    api.RunQueryResponse\n  >('RunQuery', params);\n\n  return (\n    response\n      // Omit RunQueryResponses that only contain readTimes.\n      .filter(proto => !!proto.document)\n      .map(proto => datastoreImpl.serializer.fromDocument(proto.document!))\n  );\n}\n\nexport function newPersistentWriteStream(\n  datastore: Datastore,\n  queue: AsyncQueue,\n  listener: WriteStreamListener\n): PersistentWriteStream {\n  const datastoreImpl = debugCast(datastore, DatastoreImpl);\n  return new PersistentWriteStream(\n    queue,\n    datastoreImpl.connection,\n    datastoreImpl.credentials,\n    datastoreImpl.serializer,\n    listener\n  );\n}\n\nexport function newPersistentWatchStream(\n  datastore: Datastore,\n  queue: AsyncQueue,\n  listener: WatchStreamListener\n): PersistentListenStream {\n  const datastoreImpl = debugCast(datastore, DatastoreImpl);\n  return new PersistentListenStream(\n    queue,\n    datastoreImpl.connection,\n    datastoreImpl.credentials,\n    datastoreImpl.serializer,\n    listener\n  );\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ParsedSetData, ParsedUpdateData } from '../api/user_data_reader';\nimport { documentVersionMap } from '../model/collections';\nimport { Document, MaybeDocument, NoDocument } from '../model/document';\n\nimport { DocumentKey } from '../model/document_key';\nimport {\n  DeleteMutation,\n  Mutation,\n  Precondition,\n  VerifyMutation\n} from '../model/mutation';\nimport {\n  Datastore,\n  invokeBatchGetDocumentsRpc,\n  invokeCommitRpc\n} from '../remote/datastore';\nimport { fail, debugAssert } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { SnapshotVersion } from './snapshot_version';\n\n/**\n * Internal transaction object responsible for accumulating the mutations to\n * perform and the base versions for any documents read.\n */\nexport class Transaction {\n  // The version of each document that was read during this transaction.\n  private readVersions = documentVersionMap();\n  private mutations: Mutation[] = [];\n  private committed = false;\n\n  /**\n   * A deferred usage error that occurred previously in this transaction that\n   * will cause the transaction to fail once it actually commits.\n   */\n  private lastWriteError: FirestoreError | null = null;\n\n  /**\n   * Set of documents that have been written in the transaction.\n   *\n   * When there's more than one write to the same key in a transaction, any\n   * writes after the first are handled differently.\n   */\n  private writtenDocs: Set<DocumentKey> = new Set();\n\n  constructor(private datastore: Datastore) {}\n\n  async lookup(keys: DocumentKey[]): Promise<MaybeDocument[]> {\n    this.ensureCommitNotCalled();\n\n    if (this.mutations.length > 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Firestore transactions require all reads to be executed before all writes.'\n      );\n    }\n    const docs = await invokeBatchGetDocumentsRpc(this.datastore, keys);\n    docs.forEach(doc => {\n      if (doc instanceof NoDocument || doc instanceof Document) {\n        this.recordVersion(doc);\n      } else {\n        fail('Document in a transaction was a ' + doc.constructor.name);\n      }\n    });\n    return docs;\n  }\n\n  set(key: DocumentKey, data: ParsedSetData): void {\n    this.write(data.toMutations(key, this.precondition(key)));\n    this.writtenDocs.add(key);\n  }\n\n  update(key: DocumentKey, data: ParsedUpdateData): void {\n    try {\n      this.write(data.toMutations(key, this.preconditionForUpdate(key)));\n    } catch (e) {\n      this.lastWriteError = e;\n    }\n    this.writtenDocs.add(key);\n  }\n\n  delete(key: DocumentKey): void {\n    this.write([new DeleteMutation(key, this.precondition(key))]);\n    this.writtenDocs.add(key);\n  }\n\n  async commit(): Promise<void> {\n    this.ensureCommitNotCalled();\n\n    if (this.lastWriteError) {\n      throw this.lastWriteError;\n    }\n    let unwritten = this.readVersions;\n    // For each mutation, note that the doc was written.\n    this.mutations.forEach(mutation => {\n      unwritten = unwritten.remove(mutation.key);\n    });\n    // For each document that was read but not written to, we want to perform\n    // a `verify` operation.\n    unwritten.forEach((key, _version) => {\n      this.mutations.push(new VerifyMutation(key, this.precondition(key)));\n    });\n    await invokeCommitRpc(this.datastore, this.mutations);\n    this.committed = true;\n  }\n\n  private recordVersion(doc: MaybeDocument): void {\n    let docVersion: SnapshotVersion;\n\n    if (doc instanceof Document) {\n      docVersion = doc.version;\n    } else if (doc instanceof NoDocument) {\n      // For deleted docs, we must use baseVersion 0 when we overwrite them.\n      docVersion = SnapshotVersion.min();\n    } else {\n      throw fail('Document in a transaction was a ' + doc.constructor.name);\n    }\n\n    const existingVersion = this.readVersions.get(doc.key);\n    if (existingVersion !== null) {\n      if (!docVersion.isEqual(existingVersion)) {\n        // This transaction will fail no matter what.\n        throw new FirestoreError(\n          Code.ABORTED,\n          'Document version changed between two reads.'\n        );\n      }\n    } else {\n      this.readVersions = this.readVersions.insert(doc.key, docVersion);\n    }\n  }\n\n  /**\n   * Returns the version of this document when it was read in this transaction,\n   * as a precondition, or no precondition if it was not read.\n   */\n  private precondition(key: DocumentKey): Precondition {\n    const version = this.readVersions.get(key);\n    if (!this.writtenDocs.has(key) && version) {\n      return Precondition.updateTime(version);\n    } else {\n      return Precondition.none();\n    }\n  }\n\n  /**\n   * Returns the precondition for a document if the operation is an update.\n   */\n  private preconditionForUpdate(key: DocumentKey): Precondition {\n    const version = this.readVersions.get(key);\n    // The first time a document is written, we want to take into account the\n    // read time and existence\n    if (!this.writtenDocs.has(key) && version) {\n      if (version.isEqual(SnapshotVersion.min())) {\n        // The document doesn't exist, so fail the transaction.\n\n        // This has to be validated locally because you can't send a\n        // precondition that a document does not exist without changing the\n        // semantics of the backend write to be an insert. This is the reverse\n        // of what we want, since we want to assert that the document doesn't\n        // exist but then send the update and have it fail. Since we can't\n        // express that to the backend, we have to validate locally.\n\n        // Note: this can change once we can send separate verify writes in the\n        // transaction.\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          \"Can't update a document that doesn't exist.\"\n        );\n      }\n      // Document exists, base precondition on document update time.\n      return Precondition.updateTime(version);\n    } else {\n      // Document was not read, so we just use the preconditions for a blind\n      // update.\n      return Precondition.exists(true);\n    }\n  }\n\n  private write(mutations: Mutation[]): void {\n    this.ensureCommitNotCalled();\n    this.mutations = this.mutations.concat(mutations);\n  }\n\n  private ensureCommitNotCalled(): void {\n    debugAssert(\n      !this.committed,\n      'A transaction object cannot be used after its update callback has been invoked.'\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2018 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { OnlineState } from '../core/types';\nimport { debugAssert } from '../util/assert';\nimport { AsyncQueue, DelayedOperation, TimerId } from '../util/async_queue';\nimport { FirestoreError } from '../util/error';\nimport { logError, logDebug } from '../util/log';\n\nconst LOG_TAG = 'OnlineStateTracker';\n\n// To deal with transient failures, we allow multiple stream attempts before\n// giving up and transitioning from OnlineState.Unknown to Offline.\n// TODO(mikelehen): This used to be set to 2 as a mitigation for b/66228394.\n// @jdimond thinks that bug is sufficiently fixed so that we can set this back\n// to 1. If that works okay, we could potentially remove this logic entirely.\nconst MAX_WATCH_STREAM_FAILURES = 1;\n\n// To deal with stream attempts that don't succeed or fail in a timely manner,\n// we have a timeout for OnlineState to reach Online or Offline.\n// If the timeout is reached, we transition to Offline rather than waiting\n// indefinitely.\nconst ONLINE_STATE_TIMEOUT_MS = 10 * 1000;\n\n/**\n * A component used by the RemoteStore to track the OnlineState (that is,\n * whether or not the client as a whole should be considered to be online or\n * offline), implementing the appropriate heuristics.\n *\n * In particular, when the client is trying to connect to the backend, we\n * allow up to MAX_WATCH_STREAM_FAILURES within ONLINE_STATE_TIMEOUT_MS for\n * a connection to succeed. If we have too many failures or the timeout elapses,\n * then we set the OnlineState to Offline, and the client will behave as if\n * it is offline (get()s will return cached data, etc.).\n */\nexport class OnlineStateTracker {\n  /** The current OnlineState. */\n  private state = OnlineState.Unknown;\n\n  /**\n   * A count of consecutive failures to open the stream. If it reaches the\n   * maximum defined by MAX_WATCH_STREAM_FAILURES, we'll set the OnlineState to\n   * Offline.\n   */\n  private watchStreamFailures = 0;\n\n  /**\n   * A timer that elapses after ONLINE_STATE_TIMEOUT_MS, at which point we\n   * transition from OnlineState.Unknown to OnlineState.Offline without waiting\n   * for the stream to actually fail (MAX_WATCH_STREAM_FAILURES times).\n   */\n  private onlineStateTimer: DelayedOperation<void> | null = null;\n\n  /**\n   * Whether the client should log a warning message if it fails to connect to\n   * the backend (initially true, cleared after a successful stream, or if we've\n   * logged the message already).\n   */\n  private shouldWarnClientIsOffline = true;\n\n  constructor(\n    private asyncQueue: AsyncQueue,\n    private onlineStateHandler: (onlineState: OnlineState) => void\n  ) {}\n\n  /**\n   * Called by RemoteStore when a watch stream is started (including on each\n   * backoff attempt).\n   *\n   * If this is the first attempt, it sets the OnlineState to Unknown and starts\n   * the onlineStateTimer.\n   */\n  handleWatchStreamStart(): void {\n    if (this.watchStreamFailures === 0) {\n      this.setAndBroadcast(OnlineState.Unknown);\n\n      debugAssert(\n        this.onlineStateTimer === null,\n        `onlineStateTimer shouldn't be started yet`\n      );\n      this.onlineStateTimer = this.asyncQueue.enqueueAfterDelay(\n        TimerId.OnlineStateTimeout,\n        ONLINE_STATE_TIMEOUT_MS,\n        () => {\n          this.onlineStateTimer = null;\n          debugAssert(\n            this.state === OnlineState.Unknown,\n            'Timer should be canceled if we transitioned to a different state.'\n          );\n          this.logClientOfflineWarningIfNecessary(\n            `Backend didn't respond within ${ONLINE_STATE_TIMEOUT_MS / 1000} ` +\n              `seconds.`\n          );\n          this.setAndBroadcast(OnlineState.Offline);\n\n          // NOTE: handleWatchStreamFailure() will continue to increment\n          // watchStreamFailures even though we are already marked Offline,\n          // but this is non-harmful.\n\n          return Promise.resolve();\n        }\n      );\n    }\n  }\n\n  /**\n   * Updates our OnlineState as appropriate after the watch stream reports a\n   * failure. The first failure moves us to the 'Unknown' state. We then may\n   * allow multiple failures (based on MAX_WATCH_STREAM_FAILURES) before we\n   * actually transition to the 'Offline' state.\n   */\n  handleWatchStreamFailure(error: FirestoreError): void {\n    if (this.state === OnlineState.Online) {\n      this.setAndBroadcast(OnlineState.Unknown);\n\n      // To get to OnlineState.Online, set() must have been called which would\n      // have reset our heuristics.\n      debugAssert(\n        this.watchStreamFailures === 0,\n        'watchStreamFailures must be 0'\n      );\n      debugAssert(\n        this.onlineStateTimer === null,\n        'onlineStateTimer must be null'\n      );\n    } else {\n      this.watchStreamFailures++;\n      if (this.watchStreamFailures >= MAX_WATCH_STREAM_FAILURES) {\n        this.clearOnlineStateTimer();\n\n        this.logClientOfflineWarningIfNecessary(\n          `Connection failed ${MAX_WATCH_STREAM_FAILURES} ` +\n            `times. Most recent error: ${error.toString()}`\n        );\n\n        this.setAndBroadcast(OnlineState.Offline);\n      }\n    }\n  }\n\n  /**\n   * Explicitly sets the OnlineState to the specified state.\n   *\n   * Note that this resets our timers / failure counters, etc. used by our\n   * Offline heuristics, so must not be used in place of\n   * handleWatchStreamStart() and handleWatchStreamFailure().\n   */\n  set(newState: OnlineState): void {\n    this.clearOnlineStateTimer();\n    this.watchStreamFailures = 0;\n\n    if (newState === OnlineState.Online) {\n      // We've connected to watch at least once. Don't warn the developer\n      // about being offline going forward.\n      this.shouldWarnClientIsOffline = false;\n    }\n\n    this.setAndBroadcast(newState);\n  }\n\n  private setAndBroadcast(newState: OnlineState): void {\n    if (newState !== this.state) {\n      this.state = newState;\n      this.onlineStateHandler(newState);\n    }\n  }\n\n  private logClientOfflineWarningIfNecessary(details: string): void {\n    const message =\n      `Could not reach Cloud Firestore backend. ${details}\\n` +\n      `This typically indicates that your device does not have a healthy ` +\n      `Internet connection at the moment. The client will operate in offline ` +\n      `mode until it is able to successfully connect to the backend.`;\n    if (this.shouldWarnClientIsOffline) {\n      logError(message);\n      this.shouldWarnClientIsOffline = false;\n    } else {\n      logDebug(LOG_TAG, message);\n    }\n  }\n\n  private clearOnlineStateTimer(): void {\n    if (this.onlineStateTimer !== null) {\n      this.onlineStateTimer.cancel();\n      this.onlineStateTimer = null;\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { Transaction } from '../core/transaction';\nimport { OnlineState, TargetId } from '../core/types';\nimport { ignoreIfPrimaryLeaseLoss, LocalStore } from '../local/local_store';\nimport { TargetData, TargetPurpose } from '../local/target_data';\nimport { MutationResult } from '../model/mutation';\nimport {\n  BATCHID_UNKNOWN,\n  MutationBatch,\n  MutationBatchResult\n} from '../model/mutation_batch';\nimport { debugAssert } from '../util/assert';\nimport { FirestoreError } from '../util/error';\nimport { logDebug } from '../util/log';\nimport { DocumentKeySet } from '../model/collections';\nimport { AsyncQueue } from '../util/async_queue';\nimport { ConnectivityMonitor, NetworkStatus } from './connectivity_monitor';\nimport {\n  Datastore,\n  newPersistentWatchStream,\n  newPersistentWriteStream\n} from './datastore';\nimport { OnlineStateTracker } from './online_state_tracker';\nimport {\n  PersistentListenStream,\n  PersistentWriteStream\n} from './persistent_stream';\nimport { RemoteSyncer } from './remote_syncer';\nimport { isPermanentError, isPermanentWriteError } from './rpc_error';\nimport {\n  DocumentWatchChange,\n  ExistenceFilterChange,\n  TargetMetadataProvider,\n  WatchChange,\n  WatchChangeAggregator,\n  WatchTargetChange,\n  WatchTargetChangeState\n} from './watch_change';\nimport { ByteString } from '../util/byte_string';\nimport { isIndexedDbTransactionError } from '../local/simple_db';\n\nconst LOG_TAG = 'RemoteStore';\n\n// TODO(b/35853402): Negotiate this with the stream.\nconst MAX_PENDING_WRITES = 10;\n\n/**\n * RemoteStore - An interface to remotely stored data, basically providing a\n * wrapper around the Datastore that is more reliable for the rest of the\n * system.\n *\n * RemoteStore is responsible for maintaining the connection to the server.\n * - maintaining a list of active listens.\n * - reconnecting when the connection is dropped.\n * - resuming all the active listens on reconnect.\n *\n * RemoteStore handles all incoming events from the Datastore.\n * - listening to the watch stream and repackaging the events as RemoteEvents\n * - notifying SyncEngine of any changes to the active listens.\n *\n * RemoteStore takes writes from other components and handles them reliably.\n * - pulling pending mutations from LocalStore and sending them to Datastore.\n * - retrying mutations that failed because of network problems.\n * - acking mutations to the SyncEngine once they are accepted or rejected.\n */\nexport class RemoteStore implements TargetMetadataProvider {\n  /**\n   * A list of up to MAX_PENDING_WRITES writes that we have fetched from the\n   * LocalStore via fillWritePipeline() and have or will send to the write\n   * stream.\n   *\n   * Whenever writePipeline.length > 0 the RemoteStore will attempt to start or\n   * restart the write stream. When the stream is established the writes in the\n   * pipeline will be sent in order.\n   *\n   * Writes remain in writePipeline until they are acknowledged by the backend\n   * and thus will automatically be re-sent if the stream is interrupted /\n   * restarted before they're acknowledged.\n   *\n   * Write responses from the backend are linked to their originating request\n   * purely based on order, and so we can just shift() writes from the front of\n   * the writePipeline as we receive responses.\n   */\n  private writePipeline: MutationBatch[] = [];\n\n  /**\n   * A mapping of watched targets that the client cares about tracking and the\n   * user has explicitly called a 'listen' for this target.\n   *\n   * These targets may or may not have been sent to or acknowledged by the\n   * server. On re-establishing the listen stream, these targets should be sent\n   * to the server. The targets removed with unlistens are removed eagerly\n   * without waiting for confirmation from the listen stream.\n   */\n  private listenTargets = new Map<TargetId, TargetData>();\n\n  private connectivityMonitor: ConnectivityMonitor;\n  private watchStream: PersistentListenStream;\n  private writeStream: PersistentWriteStream;\n  private watchChangeAggregator: WatchChangeAggregator | null = null;\n\n  /**\n   * Set to true by enableNetwork() and false by disableNetwork() and indicates\n   * the user-preferred network state.\n   */\n  private networkEnabled = false;\n\n  private isPrimary = false;\n\n  /**\n   * When set to `true`, the network was taken offline due to an IndexedDB\n   * failure. The state is flipped to `false` when access becomes available\n   * again.\n   */\n  private indexedDbFailed = false;\n\n  private onlineStateTracker: OnlineStateTracker;\n\n  constructor(\n    /**\n     * The local store, used to fill the write pipeline with outbound mutations.\n     */\n    private localStore: LocalStore,\n    /** The client-side proxy for interacting with the backend. */\n    private datastore: Datastore,\n    private asyncQueue: AsyncQueue,\n    onlineStateHandler: (onlineState: OnlineState) => void,\n    connectivityMonitor: ConnectivityMonitor\n  ) {\n    this.connectivityMonitor = connectivityMonitor;\n    this.connectivityMonitor.addCallback((status: NetworkStatus) => {\n      asyncQueue.enqueueAndForget(async () => {\n        if (this.canUseNetwork()) {\n          logDebug(\n            LOG_TAG,\n            'Restarting streams for network reachability change.'\n          );\n          await this.restartNetwork();\n        }\n      });\n    });\n\n    this.onlineStateTracker = new OnlineStateTracker(\n      asyncQueue,\n      onlineStateHandler\n    );\n\n    // Create streams (but note they're not started yet).\n    this.watchStream = newPersistentWatchStream(this.datastore, asyncQueue, {\n      onOpen: this.onWatchStreamOpen.bind(this),\n      onClose: this.onWatchStreamClose.bind(this),\n      onWatchChange: this.onWatchStreamChange.bind(this)\n    });\n\n    this.writeStream = newPersistentWriteStream(this.datastore, asyncQueue, {\n      onOpen: this.onWriteStreamOpen.bind(this),\n      onClose: this.onWriteStreamClose.bind(this),\n      onHandshakeComplete: this.onWriteHandshakeComplete.bind(this),\n      onMutationResult: this.onMutationResult.bind(this)\n    });\n  }\n\n  /**\n   * SyncEngine to notify of watch and write events. This must be set\n   * immediately after construction.\n   */\n  syncEngine!: RemoteSyncer;\n\n  /**\n   * Starts up the remote store, creating streams, restoring state from\n   * LocalStore, etc.\n   */\n  start(): Promise<void> {\n    return this.enableNetwork();\n  }\n\n  /** Re-enables the network. Idempotent. */\n  enableNetwork(): Promise<void> {\n    this.networkEnabled = true;\n    return this.enableNetworkInternal();\n  }\n\n  private async enableNetworkInternal(): Promise<void> {\n    if (this.canUseNetwork()) {\n      this.writeStream.lastStreamToken = await this.localStore.getLastStreamToken();\n\n      if (this.shouldStartWatchStream()) {\n        this.startWatchStream();\n      } else {\n        this.onlineStateTracker.set(OnlineState.Unknown);\n      }\n\n      // This will start the write stream if necessary.\n      await this.fillWritePipeline();\n    }\n  }\n\n  /**\n   * Temporarily disables the network. The network can be re-enabled using\n   * enableNetwork().\n   */\n  async disableNetwork(): Promise<void> {\n    this.networkEnabled = false;\n    await this.disableNetworkInternal();\n\n    // Set the OnlineState to Offline so get()s return from cache, etc.\n    this.onlineStateTracker.set(OnlineState.Offline);\n  }\n\n  private async disableNetworkInternal(): Promise<void> {\n    await this.writeStream.stop();\n    await this.watchStream.stop();\n\n    if (this.writePipeline.length > 0) {\n      logDebug(\n        LOG_TAG,\n        `Stopping write stream with ${this.writePipeline.length} pending writes`\n      );\n      this.writePipeline = [];\n    }\n\n    this.cleanUpWatchStreamState();\n  }\n\n  async shutdown(): Promise<void> {\n    logDebug(LOG_TAG, 'RemoteStore shutting down.');\n    this.networkEnabled = false;\n    await this.disableNetworkInternal();\n    this.connectivityMonitor.shutdown();\n\n    // Set the OnlineState to Unknown (rather than Offline) to avoid potentially\n    // triggering spurious listener events with cached data, etc.\n    this.onlineStateTracker.set(OnlineState.Unknown);\n  }\n\n  /**\n   * Starts new listen for the given target. Uses resume token if provided. It\n   * is a no-op if the target of given `TargetData` is already being listened to.\n   */\n  listen(targetData: TargetData): void {\n    if (this.listenTargets.has(targetData.targetId)) {\n      return;\n    }\n\n    // Mark this as something the client is currently listening for.\n    this.listenTargets.set(targetData.targetId, targetData);\n\n    if (this.shouldStartWatchStream()) {\n      // The listen will be sent in onWatchStreamOpen\n      this.startWatchStream();\n    } else if (this.watchStream.isOpen()) {\n      this.sendWatchRequest(targetData);\n    }\n  }\n\n  /**\n   * Removes the listen from server. It is a no-op if the given target id is\n   * not being listened to.\n   */\n  unlisten(targetId: TargetId): void {\n    debugAssert(\n      this.listenTargets.has(targetId),\n      `unlisten called on target no currently watched: ${targetId}`\n    );\n\n    this.listenTargets.delete(targetId);\n    if (this.watchStream.isOpen()) {\n      this.sendUnwatchRequest(targetId);\n    }\n\n    if (this.listenTargets.size === 0) {\n      if (this.watchStream.isOpen()) {\n        this.watchStream.markIdle();\n      } else if (this.canUseNetwork()) {\n        // Revert to OnlineState.Unknown if the watch stream is not open and we\n        // have no listeners, since without any listens to send we cannot\n        // confirm if the stream is healthy and upgrade to OnlineState.Online.\n        this.onlineStateTracker.set(OnlineState.Unknown);\n      }\n    }\n  }\n\n  /** {@link TargetMetadataProvider.getTargetDataForTarget} */\n  getTargetDataForTarget(targetId: TargetId): TargetData | null {\n    return this.listenTargets.get(targetId) || null;\n  }\n\n  /** {@link TargetMetadataProvider.getRemoteKeysForTarget} */\n  getRemoteKeysForTarget(targetId: TargetId): DocumentKeySet {\n    return this.syncEngine.getRemoteKeysForTarget(targetId);\n  }\n\n  /**\n   * We need to increment the the expected number of pending responses we're due\n   * from watch so we wait for the ack to process any messages from this target.\n   */\n  private sendWatchRequest(targetData: TargetData): void {\n    this.watchChangeAggregator!.recordPendingTargetRequest(targetData.targetId);\n    this.watchStream.watch(targetData);\n  }\n\n  /**\n   * We need to increment the expected number of pending responses we're due\n   * from watch so we wait for the removal on the server before we process any\n   * messages from this target.\n   */\n  private sendUnwatchRequest(targetId: TargetId): void {\n    this.watchChangeAggregator!.recordPendingTargetRequest(targetId);\n    this.watchStream.unwatch(targetId);\n  }\n\n  private startWatchStream(): void {\n    debugAssert(\n      this.shouldStartWatchStream(),\n      'startWatchStream() called when shouldStartWatchStream() is false.'\n    );\n\n    this.watchChangeAggregator = new WatchChangeAggregator(this);\n    this.watchStream.start();\n    this.onlineStateTracker.handleWatchStreamStart();\n  }\n\n  /**\n   * Returns whether the watch stream should be started because it's necessary\n   * and has not yet been started.\n   */\n  private shouldStartWatchStream(): boolean {\n    return (\n      this.canUseNetwork() &&\n      !this.watchStream.isStarted() &&\n      this.listenTargets.size > 0\n    );\n  }\n\n  canUseNetwork(): boolean {\n    return !this.indexedDbFailed && this.isPrimary && this.networkEnabled;\n  }\n\n  private cleanUpWatchStreamState(): void {\n    this.watchChangeAggregator = null;\n  }\n\n  private async onWatchStreamOpen(): Promise<void> {\n    this.listenTargets.forEach((targetData, targetId) => {\n      this.sendWatchRequest(targetData);\n    });\n  }\n\n  private async onWatchStreamClose(error?: FirestoreError): Promise<void> {\n    if (error === undefined) {\n      // Graceful stop (due to stop() or idle timeout). Make sure that's\n      // desirable.\n      debugAssert(\n        !this.shouldStartWatchStream(),\n        'Watch stream was stopped gracefully while still needed.'\n      );\n    }\n\n    this.cleanUpWatchStreamState();\n\n    // If we still need the watch stream, retry the connection.\n    if (this.shouldStartWatchStream()) {\n      this.onlineStateTracker.handleWatchStreamFailure(error!);\n\n      this.startWatchStream();\n    } else {\n      // No need to restart watch stream because there are no active targets.\n      // The online state is set to unknown because there is no active attempt\n      // at establishing a connection\n      this.onlineStateTracker.set(OnlineState.Unknown);\n    }\n  }\n\n  private async onWatchStreamChange(\n    watchChange: WatchChange,\n    snapshotVersion: SnapshotVersion\n  ): Promise<void> {\n    // Mark the client as online since we got a message from the server\n    this.onlineStateTracker.set(OnlineState.Online);\n\n    if (\n      watchChange instanceof WatchTargetChange &&\n      watchChange.state === WatchTargetChangeState.Removed &&\n      watchChange.cause\n    ) {\n      // There was an error on a target, don't wait for a consistent snapshot\n      // to raise events\n      try {\n        await this.handleTargetError(watchChange);\n      } catch (e) {\n        logDebug(\n          LOG_TAG,\n          'Failed to remove targets %s: %s ',\n          watchChange.targetIds.join(','),\n          e\n        );\n        await this.disableNetworkUntilRecovery(e);\n      }\n      return;\n    }\n\n    if (watchChange instanceof DocumentWatchChange) {\n      this.watchChangeAggregator!.handleDocumentChange(watchChange);\n    } else if (watchChange instanceof ExistenceFilterChange) {\n      this.watchChangeAggregator!.handleExistenceFilter(watchChange);\n    } else {\n      debugAssert(\n        watchChange instanceof WatchTargetChange,\n        'Expected watchChange to be an instance of WatchTargetChange'\n      );\n      this.watchChangeAggregator!.handleTargetChange(watchChange);\n    }\n\n    if (!snapshotVersion.isEqual(SnapshotVersion.min())) {\n      try {\n        const lastRemoteSnapshotVersion = await this.localStore.getLastRemoteSnapshotVersion();\n        if (snapshotVersion.compareTo(lastRemoteSnapshotVersion) >= 0) {\n          // We have received a target change with a global snapshot if the snapshot\n          // version is not equal to SnapshotVersion.min().\n          await this.raiseWatchSnapshot(snapshotVersion);\n        }\n      } catch (e) {\n        logDebug(LOG_TAG, 'Failed to raise snapshot:', e);\n        await this.disableNetworkUntilRecovery(e);\n      }\n    }\n  }\n\n  /**\n   * Recovery logic for IndexedDB errors that takes the network offline until\n   * IndexedDb probing succeeds. Retries are scheduled with backoff using\n   * `enqueueRetryable()`.\n   */\n  private async disableNetworkUntilRecovery(e: FirestoreError): Promise<void> {\n    if (isIndexedDbTransactionError(e)) {\n      debugAssert(\n        !this.indexedDbFailed,\n        'Unexpected network event when IndexedDB was marked failed.'\n      );\n      this.indexedDbFailed = true;\n\n      // Disable network and raise offline snapshots\n      await this.disableNetworkInternal();\n      this.onlineStateTracker.set(OnlineState.Offline);\n\n      // Probe IndexedDB periodically and re-enable network\n      this.asyncQueue.enqueueRetryable(async () => {\n        logDebug(LOG_TAG, 'Retrying IndexedDB access');\n        // Issue a simple read operation to determine if IndexedDB recovered.\n        // Ideally, we would expose a health check directly on SimpleDb, but\n        // RemoteStore only has access to persistence through LocalStore.\n        await this.localStore.getLastRemoteSnapshotVersion();\n        this.indexedDbFailed = false;\n        await this.enableNetworkInternal();\n      });\n    } else {\n      throw e;\n    }\n  }\n\n  /**\n   * Takes a batch of changes from the Datastore, repackages them as a\n   * RemoteEvent, and passes that on to the listener, which is typically the\n   * SyncEngine.\n   */\n  private raiseWatchSnapshot(snapshotVersion: SnapshotVersion): Promise<void> {\n    debugAssert(\n      !snapshotVersion.isEqual(SnapshotVersion.min()),\n      \"Can't raise event for unknown SnapshotVersion\"\n    );\n    const remoteEvent = this.watchChangeAggregator!.createRemoteEvent(\n      snapshotVersion\n    );\n\n    // Update in-memory resume tokens. LocalStore will update the\n    // persistent view of these when applying the completed RemoteEvent.\n    remoteEvent.targetChanges.forEach((change, targetId) => {\n      if (change.resumeToken.approximateByteSize() > 0) {\n        const targetData = this.listenTargets.get(targetId);\n        // A watched target might have been removed already.\n        if (targetData) {\n          this.listenTargets.set(\n            targetId,\n            targetData.withResumeToken(change.resumeToken, snapshotVersion)\n          );\n        }\n      }\n    });\n\n    // Re-establish listens for the targets that have been invalidated by\n    // existence filter mismatches.\n    remoteEvent.targetMismatches.forEach(targetId => {\n      const targetData = this.listenTargets.get(targetId);\n      if (!targetData) {\n        // A watched target might have been removed already.\n        return;\n      }\n\n      // Clear the resume token for the target, since we're in a known mismatch\n      // state.\n      this.listenTargets.set(\n        targetId,\n        targetData.withResumeToken(\n          ByteString.EMPTY_BYTE_STRING,\n          targetData.snapshotVersion\n        )\n      );\n\n      // Cause a hard reset by unwatching and rewatching immediately, but\n      // deliberately don't send a resume token so that we get a full update.\n      this.sendUnwatchRequest(targetId);\n\n      // Mark the target we send as being on behalf of an existence filter\n      // mismatch, but don't actually retain that in listenTargets. This ensures\n      // that we flag the first re-listen this way without impacting future\n      // listens of this target (that might happen e.g. on reconnect).\n      const requestTargetData = new TargetData(\n        targetData.target,\n        targetId,\n        TargetPurpose.ExistenceFilterMismatch,\n        targetData.sequenceNumber\n      );\n      this.sendWatchRequest(requestTargetData);\n    });\n\n    // Finally raise remote event\n    return this.syncEngine.applyRemoteEvent(remoteEvent);\n  }\n\n  /** Handles an error on a target */\n  private async handleTargetError(\n    watchChange: WatchTargetChange\n  ): Promise<void> {\n    debugAssert(!!watchChange.cause, 'Handling target error without a cause');\n    const error = watchChange.cause!;\n    for (const targetId of watchChange.targetIds) {\n      // A watched target might have been removed already.\n      if (this.listenTargets.has(targetId)) {\n        await this.syncEngine.rejectListen(targetId, error);\n        this.listenTargets.delete(targetId);\n        this.watchChangeAggregator!.removeTarget(targetId);\n      }\n    }\n  }\n\n  /**\n   * Attempts to fill our write pipeline with writes from the LocalStore.\n   *\n   * Called internally to bootstrap or refill the write pipeline and by\n   * SyncEngine whenever there are new mutations to process.\n   *\n   * Starts the write stream if necessary.\n   */\n  async fillWritePipeline(): Promise<void> {\n    if (this.canAddToWritePipeline()) {\n      const lastBatchIdRetrieved =\n        this.writePipeline.length > 0\n          ? this.writePipeline[this.writePipeline.length - 1].batchId\n          : BATCHID_UNKNOWN;\n      const batch = await this.localStore.nextMutationBatch(\n        lastBatchIdRetrieved\n      );\n\n      if (batch === null) {\n        if (this.writePipeline.length === 0) {\n          this.writeStream.markIdle();\n        }\n      } else {\n        this.addToWritePipeline(batch);\n        await this.fillWritePipeline();\n      }\n    }\n\n    if (this.shouldStartWriteStream()) {\n      this.startWriteStream();\n    }\n  }\n\n  /**\n   * Returns true if we can add to the write pipeline (i.e. the network is\n   * enabled and the write pipeline is not full).\n   */\n  private canAddToWritePipeline(): boolean {\n    return (\n      this.canUseNetwork() && this.writePipeline.length < MAX_PENDING_WRITES\n    );\n  }\n\n  // For testing\n  outstandingWrites(): number {\n    return this.writePipeline.length;\n  }\n\n  /**\n   * Queues additional writes to be sent to the write stream, sending them\n   * immediately if the write stream is established.\n   */\n  private addToWritePipeline(batch: MutationBatch): void {\n    debugAssert(\n      this.canAddToWritePipeline(),\n      'addToWritePipeline called when pipeline is full'\n    );\n    this.writePipeline.push(batch);\n\n    if (this.writeStream.isOpen() && this.writeStream.handshakeComplete) {\n      this.writeStream.writeMutations(batch.mutations);\n    }\n  }\n\n  private shouldStartWriteStream(): boolean {\n    return (\n      this.canUseNetwork() &&\n      !this.writeStream.isStarted() &&\n      this.writePipeline.length > 0\n    );\n  }\n\n  private startWriteStream(): void {\n    debugAssert(\n      this.shouldStartWriteStream(),\n      'startWriteStream() called when shouldStartWriteStream() is false.'\n    );\n    this.writeStream.start();\n  }\n\n  private async onWriteStreamOpen(): Promise<void> {\n    this.writeStream.writeHandshake();\n  }\n\n  private onWriteHandshakeComplete(): Promise<void> {\n    // Record the stream token.\n    return this.localStore\n      .setLastStreamToken(this.writeStream.lastStreamToken)\n      .then(() => {\n        // Send the write pipeline now that the stream is established.\n        for (const batch of this.writePipeline) {\n          this.writeStream.writeMutations(batch.mutations);\n        }\n      })\n      .catch(ignoreIfPrimaryLeaseLoss);\n  }\n\n  private onMutationResult(\n    commitVersion: SnapshotVersion,\n    results: MutationResult[]\n  ): Promise<void> {\n    // This is a response to a write containing mutations and should be\n    // correlated to the first write in our write pipeline.\n    debugAssert(\n      this.writePipeline.length > 0,\n      'Got result for empty write pipeline'\n    );\n    const batch = this.writePipeline.shift()!;\n    const success = MutationBatchResult.from(\n      batch,\n      commitVersion,\n      results,\n      this.writeStream.lastStreamToken\n    );\n    return this.syncEngine.applySuccessfulWrite(success).then(() => {\n      // It's possible that with the completion of this mutation another\n      // slot has freed up.\n      return this.fillWritePipeline();\n    });\n  }\n\n  private async onWriteStreamClose(error?: FirestoreError): Promise<void> {\n    if (error === undefined) {\n      // Graceful stop (due to stop() or idle timeout). Make sure that's\n      // desirable.\n      debugAssert(\n        !this.shouldStartWriteStream(),\n        'Write stream was stopped gracefully while still needed.'\n      );\n    }\n\n    // If the write stream closed due to an error, invoke the error callbacks if\n    // there are pending writes.\n    if (error && this.writePipeline.length > 0) {\n      if (this.writeStream.handshakeComplete) {\n        // This error affects the actual write.\n        await this.handleWriteError(error!);\n      } else {\n        // If there was an error before the handshake has finished, it's\n        // possible that the server is unable to process the stream token\n        // we're sending. (Perhaps it's too old?)\n        await this.handleHandshakeError(error!);\n      }\n\n      // The write stream might have been started by refilling the write\n      // pipeline for failed writes\n      if (this.shouldStartWriteStream()) {\n        this.startWriteStream();\n      }\n    }\n    // No pending writes, nothing to do\n  }\n\n  private async handleHandshakeError(error: FirestoreError): Promise<void> {\n    // Reset the token if it's a permanent error, signaling the write stream is\n    // no longer valid. Note that the handshake does not count as a write: see\n    // comments on isPermanentWriteError for details.\n    if (isPermanentError(error.code)) {\n      logDebug(\n        LOG_TAG,\n        'RemoteStore error before completed handshake; resetting stream token: ',\n        this.writeStream.lastStreamToken\n      );\n      this.writeStream.lastStreamToken = ByteString.EMPTY_BYTE_STRING;\n\n      return this.localStore\n        .setLastStreamToken(ByteString.EMPTY_BYTE_STRING)\n        .catch(ignoreIfPrimaryLeaseLoss);\n    } else {\n      // Some other error, don't reset stream token. Our stream logic will\n      // just retry with exponential backoff.\n    }\n  }\n\n  private async handleWriteError(error: FirestoreError): Promise<void> {\n    // Only handle permanent errors here. If it's transient, just let the retry\n    // logic kick in.\n    if (isPermanentWriteError(error.code)) {\n      // This was a permanent error, the request itself was the problem\n      // so it's not going to succeed if we resend it.\n      const batch = this.writePipeline.shift()!;\n\n      // In this case it's also unlikely that the server itself is melting\n      // down -- this was just a bad request so inhibit backoff on the next\n      // restart.\n      this.writeStream.inhibitBackoff();\n\n      return this.syncEngine\n        .rejectFailedWrite(batch.batchId, error)\n        .then(() => {\n          // It's possible that with the completion of this mutation\n          // another slot has freed up.\n          return this.fillWritePipeline();\n        });\n    } else {\n      // Transient error, just let the retry logic kick in.\n    }\n  }\n\n  createTransaction(): Transaction {\n    return new Transaction(this.datastore);\n  }\n\n  private async restartNetwork(): Promise<void> {\n    this.networkEnabled = false;\n    await this.disableNetworkInternal();\n    this.onlineStateTracker.set(OnlineState.Unknown);\n    await this.enableNetwork();\n  }\n\n  async handleCredentialChange(): Promise<void> {\n    if (this.canUseNetwork()) {\n      // Tear down and re-create our network streams. This will ensure we get a fresh auth token\n      // for the new user and re-fill the write pipeline with new mutations from the LocalStore\n      // (since mutations are per-user).\n      logDebug(LOG_TAG, 'RemoteStore restarting streams for new credential');\n      await this.restartNetwork();\n    }\n  }\n\n  /**\n   * Toggles the network state when the client gains or loses its primary lease.\n   */\n  async applyPrimaryState(isPrimary: boolean): Promise<void> {\n    this.isPrimary = isPrimary;\n\n    if (isPrimary && this.networkEnabled) {\n      await this.enableNetwork();\n    } else if (!isPrimary) {\n      await this.disableNetworkInternal();\n      this.onlineStateTracker.set(OnlineState.Unknown);\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { BatchId, MutationBatchState, TargetId } from '../core/types';\nimport { QueryTargetState } from './shared_client_state_syncer';\nimport { debugAssert } from '../util/assert';\nimport { ClientId } from './shared_client_state';\nimport { User } from '../auth/user';\n\n// The format of the LocalStorage key that stores the client state is:\n//     firestore_clients_<persistence_prefix>_<instance_key>\nexport const CLIENT_STATE_KEY_PREFIX = 'firestore_clients';\n\n/** Assembles the key for a client state in WebStorage */\nexport function createWebStorageClientStateKey(\n  persistenceKey: string,\n  clientId: ClientId\n): string {\n  debugAssert(\n    clientId.indexOf('_') === -1,\n    `Client key cannot contain '_', but was '${clientId}'`\n  );\n\n  return `${CLIENT_STATE_KEY_PREFIX}_${persistenceKey}_${clientId}`;\n}\n\n/**\n * The JSON representation of a clients's metadata as used during WebStorage\n * serialization. The ClientId is omitted here as it is encoded as part of the\n * key.\n */\nexport interface ClientStateSchema {\n  activeTargetIds: number[];\n  updateTimeMs: number;\n}\n\n// The format of the WebStorage key that stores the mutation state is:\n//     firestore_mutations_<persistence_prefix>_<batch_id>\n//     (for unauthenticated users)\n// or: firestore_mutations_<persistence_prefix>_<batch_id>_<user_uid>\n//\n// 'user_uid' is last to avoid needing to escape '_' characters that it might\n// contain.\nexport const MUTATION_BATCH_KEY_PREFIX = 'firestore_mutations';\n\n/** Assembles the key for a mutation batch in WebStorage */\nexport function createWebStorageMutationBatchKey(\n  persistenceKey: string,\n  user: User,\n  batchId: BatchId\n): string {\n  let mutationKey = `${MUTATION_BATCH_KEY_PREFIX}_${persistenceKey}_${batchId}`;\n\n  if (user.isAuthenticated()) {\n    mutationKey += `_${user.uid}`;\n  }\n\n  return mutationKey;\n}\n\n/**\n * The JSON representation of a mutation batch's metadata as used during\n * WebStorage serialization. The UserId and BatchId is omitted as it is\n * encoded as part of the key.\n */\nexport interface MutationMetadataSchema {\n  state: MutationBatchState;\n  error?: { code: string; message: string }; // Only set when state === 'rejected'\n  updateTimeMs: number;\n}\n\n// The format of the WebStorage key that stores a query target's metadata is:\n//     firestore_targets_<persistence_prefix>_<target_id>\nexport const QUERY_TARGET_KEY_PREFIX = 'firestore_targets';\n\n/** Assembles the key for a query state in WebStorage */\nexport function createWebStorageQueryTargetMetadataKey(\n  persistenceKey: string,\n  targetId: TargetId\n): string {\n  return `${QUERY_TARGET_KEY_PREFIX}_${persistenceKey}_${targetId}`;\n}\n\n/**\n * The JSON representation of a query target's state as used during WebStorage\n * serialization. The TargetId is omitted as it is encoded as part of the key.\n */\nexport interface QueryTargetStateSchema {\n  state: QueryTargetState;\n  error?: { code: string; message: string }; // Only set when state === 'rejected'\n  updateTimeMs: number;\n}\n\n// The WebStorage prefix that stores the primary tab's online state. The\n// format of the key is:\n//     firestore_online_state_<persistence_prefix>\nexport const ONLINE_STATE_KEY_PREFIX = 'firestore_online_state';\n\n/** Assembles the key for the online state of the primary tab. */\nexport function createWebStorageOnlineStateKey(persistenceKey: string): string {\n  return `${ONLINE_STATE_KEY_PREFIX}_${persistenceKey}`;\n}\n\n/**\n * The JSON representation of the system's online state, as written by the\n * primary client.\n */\nexport interface SharedOnlineStateSchema {\n  /**\n   * The clientId of the client that wrote this onlineState value. Tracked so\n   * that on startup, clients can check if this client is still active when\n   * determining whether to apply this value or not.\n   */\n  readonly clientId: string;\n  readonly onlineState: string;\n}\n\n// The WebStorage key prefix for the key that stores the last sequence number allocated. The key\n// looks like 'firestore_sequence_number_<persistence_prefix>'.\nexport const SEQUENCE_NUMBER_KEY_PREFIX = 'firestore_sequence_number';\n\n/** Assembles the key for the current sequence number. */\nexport function createWebStorageSequenceNumberKey(\n  persistenceKey: string\n): string {\n  return `${SEQUENCE_NUMBER_KEY_PREFIX}_${persistenceKey}`;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { QueryResult } from '../local/local_store';\nimport {\n  documentKeySet,\n  DocumentKeySet,\n  MaybeDocumentMap\n} from '../model/collections';\nimport { Document, MaybeDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { DocumentSet } from '../model/document_set';\nimport { TargetChange } from '../remote/remote_event';\nimport { debugAssert, fail } from '../util/assert';\n\nimport { Query } from './query';\nimport { OnlineState } from './types';\nimport {\n  ChangeType,\n  DocumentChangeSet,\n  SyncState,\n  ViewSnapshot\n} from './view_snapshot';\n\nexport type LimboDocumentChange = AddedLimboDocument | RemovedLimboDocument;\nexport class AddedLimboDocument {\n  constructor(public key: DocumentKey) {}\n}\nexport class RemovedLimboDocument {\n  constructor(public key: DocumentKey) {}\n}\n\n/** The result of applying a set of doc changes to a view. */\nexport interface ViewDocumentChanges {\n  /** The new set of docs that should be in the view. */\n  documentSet: DocumentSet;\n  /** The diff of these docs with the previous set of docs. */\n  changeSet: DocumentChangeSet;\n  /**\n   * Whether the set of documents passed in was not sufficient to calculate the\n   * new state of the view and there needs to be another pass based on the\n   * local cache.\n   */\n  needsRefill: boolean;\n\n  mutatedKeys: DocumentKeySet;\n}\n\nexport interface ViewChange {\n  snapshot?: ViewSnapshot;\n  limboChanges: LimboDocumentChange[];\n}\n\n/**\n * View is responsible for computing the final merged truth of what docs are in\n * a query. It gets notified of local and remote changes to docs, and applies\n * the query filters and limits to determine the most correct possible results.\n */\nexport class View {\n  private syncState: SyncState | null = null;\n  /**\n   * A flag whether the view is current with the backend. A view is considered\n   * current after it has seen the current flag from the backend and did not\n   * lose consistency within the watch stream (e.g. because of an existence\n   * filter mismatch).\n   */\n  private current = false;\n  private documentSet: DocumentSet;\n  /** Documents in the view but not in the remote target */\n  private limboDocuments = documentKeySet();\n  /** Document Keys that have local changes */\n  private mutatedKeys = documentKeySet();\n\n  constructor(\n    private query: Query,\n    /** Documents included in the remote target */\n    private _syncedDocuments: DocumentKeySet\n  ) {\n    this.documentSet = new DocumentSet(query.docComparator.bind(query));\n  }\n\n  /**\n   * The set of remote documents that the server has told us belongs to the target associated with\n   * this view.\n   */\n  get syncedDocuments(): DocumentKeySet {\n    return this._syncedDocuments;\n  }\n\n  /**\n   * Iterates over a set of doc changes, applies the query limit, and computes\n   * what the new results should be, what the changes were, and whether we may\n   * need to go back to the local cache for more results. Does not make any\n   * changes to the view.\n   * @param docChanges The doc changes to apply to this view.\n   * @param previousChanges If this is being called with a refill, then start\n   *        with this set of docs and changes instead of the current view.\n   * @return a new set of docs, changes, and refill flag.\n   */\n  computeDocChanges(\n    docChanges: MaybeDocumentMap,\n    previousChanges?: ViewDocumentChanges\n  ): ViewDocumentChanges {\n    const changeSet = previousChanges\n      ? previousChanges.changeSet\n      : new DocumentChangeSet();\n    const oldDocumentSet = previousChanges\n      ? previousChanges.documentSet\n      : this.documentSet;\n    let newMutatedKeys = previousChanges\n      ? previousChanges.mutatedKeys\n      : this.mutatedKeys;\n    let newDocumentSet = oldDocumentSet;\n    let needsRefill = false;\n\n    // Track the last doc in a (full) limit. This is necessary, because some\n    // update (a delete, or an update moving a doc past the old limit) might\n    // mean there is some other document in the local cache that either should\n    // come (1) between the old last limit doc and the new last document, in the\n    // case of updates, or (2) after the new last document, in the case of\n    // deletes. So we keep this doc at the old limit to compare the updates to.\n    //\n    // Note that this should never get used in a refill (when previousChanges is\n    // set), because there will only be adds -- no deletes or updates.\n    const lastDocInLimit =\n      this.query.hasLimitToFirst() && oldDocumentSet.size === this.query.limit\n        ? oldDocumentSet.last()\n        : null;\n    const firstDocInLimit =\n      this.query.hasLimitToLast() && oldDocumentSet.size === this.query.limit\n        ? oldDocumentSet.first()\n        : null;\n\n    docChanges.inorderTraversal(\n      (key: DocumentKey, newMaybeDoc: MaybeDocument) => {\n        const oldDoc = oldDocumentSet.get(key);\n        let newDoc = newMaybeDoc instanceof Document ? newMaybeDoc : null;\n        if (newDoc) {\n          debugAssert(\n            key.isEqual(newDoc.key),\n            'Mismatching keys found in document changes: ' +\n              key +\n              ' != ' +\n              newDoc.key\n          );\n          newDoc = this.query.matches(newDoc) ? newDoc : null;\n        }\n\n        const oldDocHadPendingMutations = oldDoc\n          ? this.mutatedKeys.has(oldDoc.key)\n          : false;\n        const newDocHasPendingMutations = newDoc\n          ? newDoc.hasLocalMutations ||\n            // We only consider committed mutations for documents that were\n            // mutated during the lifetime of the view.\n            (this.mutatedKeys.has(newDoc.key) && newDoc.hasCommittedMutations)\n          : false;\n\n        let changeApplied = false;\n\n        // Calculate change\n        if (oldDoc && newDoc) {\n          const docsEqual = oldDoc.data().isEqual(newDoc.data());\n          if (!docsEqual) {\n            if (!this.shouldWaitForSyncedDocument(oldDoc, newDoc)) {\n              changeSet.track({\n                type: ChangeType.Modified,\n                doc: newDoc\n              });\n              changeApplied = true;\n\n              if (\n                (lastDocInLimit &&\n                  this.query.docComparator(newDoc, lastDocInLimit) > 0) ||\n                (firstDocInLimit &&\n                  this.query.docComparator(newDoc, firstDocInLimit) < 0)\n              ) {\n                // This doc moved from inside the limit to outside the limit.\n                // That means there may be some other doc in the local cache\n                // that should be included instead.\n                needsRefill = true;\n              }\n            }\n          } else if (oldDocHadPendingMutations !== newDocHasPendingMutations) {\n            changeSet.track({ type: ChangeType.Metadata, doc: newDoc });\n            changeApplied = true;\n          }\n        } else if (!oldDoc && newDoc) {\n          changeSet.track({ type: ChangeType.Added, doc: newDoc });\n          changeApplied = true;\n        } else if (oldDoc && !newDoc) {\n          changeSet.track({ type: ChangeType.Removed, doc: oldDoc });\n          changeApplied = true;\n\n          if (lastDocInLimit || firstDocInLimit) {\n            // A doc was removed from a full limit query. We'll need to\n            // requery from the local cache to see if we know about some other\n            // doc that should be in the results.\n            needsRefill = true;\n          }\n        }\n\n        if (changeApplied) {\n          if (newDoc) {\n            newDocumentSet = newDocumentSet.add(newDoc);\n            if (newDocHasPendingMutations) {\n              newMutatedKeys = newMutatedKeys.add(key);\n            } else {\n              newMutatedKeys = newMutatedKeys.delete(key);\n            }\n          } else {\n            newDocumentSet = newDocumentSet.delete(key);\n            newMutatedKeys = newMutatedKeys.delete(key);\n          }\n        }\n      }\n    );\n\n    // Drop documents out to meet limit/limitToLast requirement.\n    if (this.query.hasLimitToFirst() || this.query.hasLimitToLast()) {\n      while (newDocumentSet.size > this.query.limit!) {\n        const oldDoc = this.query.hasLimitToFirst()\n          ? newDocumentSet.last()\n          : newDocumentSet.first();\n        newDocumentSet = newDocumentSet.delete(oldDoc!.key);\n        newMutatedKeys = newMutatedKeys.delete(oldDoc!.key);\n        changeSet.track({ type: ChangeType.Removed, doc: oldDoc! });\n      }\n    }\n\n    debugAssert(\n      !needsRefill || !previousChanges,\n      'View was refilled using docs that themselves needed refilling.'\n    );\n    return {\n      documentSet: newDocumentSet,\n      changeSet,\n      needsRefill,\n      mutatedKeys: newMutatedKeys\n    };\n  }\n\n  private shouldWaitForSyncedDocument(\n    oldDoc: Document,\n    newDoc: Document\n  ): boolean {\n    // We suppress the initial change event for documents that were modified as\n    // part of a write acknowledgment (e.g. when the value of a server transform\n    // is applied) as Watch will send us the same document again.\n    // By suppressing the event, we only raise two user visible events (one with\n    // `hasPendingWrites` and the final state of the document) instead of three\n    // (one with `hasPendingWrites`, the modified document with\n    // `hasPendingWrites` and the final state of the document).\n    return (\n      oldDoc.hasLocalMutations &&\n      newDoc.hasCommittedMutations &&\n      !newDoc.hasLocalMutations\n    );\n  }\n\n  /**\n   * Updates the view with the given ViewDocumentChanges and optionally updates\n   * limbo docs and sync state from the provided target change.\n   * @param docChanges The set of changes to make to the view's docs.\n   * @param updateLimboDocuments Whether to update limbo documents based on this\n   *        change.\n   * @param targetChange A target change to apply for computing limbo docs and\n   *        sync state.\n   * @return A new ViewChange with the given docs, changes, and sync state.\n   */\n  // PORTING NOTE: The iOS/Android clients always compute limbo document changes.\n  applyChanges(\n    docChanges: ViewDocumentChanges,\n    updateLimboDocuments: boolean,\n    targetChange?: TargetChange\n  ): ViewChange {\n    debugAssert(\n      !docChanges.needsRefill,\n      'Cannot apply changes that need a refill'\n    );\n    const oldDocs = this.documentSet;\n    this.documentSet = docChanges.documentSet;\n    this.mutatedKeys = docChanges.mutatedKeys;\n    // Sort changes based on type and query comparator\n    const changes = docChanges.changeSet.getChanges();\n    changes.sort((c1, c2) => {\n      return (\n        compareChangeType(c1.type, c2.type) ||\n        this.query.docComparator(c1.doc, c2.doc)\n      );\n    });\n\n    this.applyTargetChange(targetChange);\n    const limboChanges = updateLimboDocuments\n      ? this.updateLimboDocuments()\n      : [];\n    const synced = this.limboDocuments.size === 0 && this.current;\n    const newSyncState = synced ? SyncState.Synced : SyncState.Local;\n    const syncStateChanged = newSyncState !== this.syncState;\n    this.syncState = newSyncState;\n\n    if (changes.length === 0 && !syncStateChanged) {\n      // no changes\n      return { limboChanges };\n    } else {\n      const snap: ViewSnapshot = new ViewSnapshot(\n        this.query,\n        docChanges.documentSet,\n        oldDocs,\n        changes,\n        docChanges.mutatedKeys,\n        newSyncState === SyncState.Local,\n        syncStateChanged,\n        /* excludesMetadataChanges= */ false\n      );\n      return {\n        snapshot: snap,\n        limboChanges\n      };\n    }\n  }\n\n  /**\n   * Applies an OnlineState change to the view, potentially generating a\n   * ViewChange if the view's syncState changes as a result.\n   */\n  applyOnlineStateChange(onlineState: OnlineState): ViewChange {\n    if (this.current && onlineState === OnlineState.Offline) {\n      // If we're offline, set `current` to false and then call applyChanges()\n      // to refresh our syncState and generate a ViewChange as appropriate. We\n      // are guaranteed to get a new TargetChange that sets `current` back to\n      // true once the client is back online.\n      this.current = false;\n      return this.applyChanges(\n        {\n          documentSet: this.documentSet,\n          changeSet: new DocumentChangeSet(),\n          mutatedKeys: this.mutatedKeys,\n          needsRefill: false\n        },\n        /* updateLimboDocuments= */ false\n      );\n    } else {\n      // No effect, just return a no-op ViewChange.\n      return { limboChanges: [] };\n    }\n  }\n\n  /**\n   * Returns whether the doc for the given key should be in limbo.\n   */\n  private shouldBeInLimbo(key: DocumentKey): boolean {\n    // If the remote end says it's part of this query, it's not in limbo.\n    if (this._syncedDocuments.has(key)) {\n      return false;\n    }\n    // The local store doesn't think it's a result, so it shouldn't be in limbo.\n    if (!this.documentSet.has(key)) {\n      return false;\n    }\n    // If there are local changes to the doc, they might explain why the server\n    // doesn't know that it's part of the query. So don't put it in limbo.\n    // TODO(klimt): Ideally, we would only consider changes that might actually\n    // affect this specific query.\n    if (this.documentSet.get(key)!.hasLocalMutations) {\n      return false;\n    }\n    // Everything else is in limbo.\n    return true;\n  }\n\n  /**\n   * Updates syncedDocuments, current, and limbo docs based on the given change.\n   * Returns the list of changes to which docs are in limbo.\n   */\n  private applyTargetChange(targetChange?: TargetChange): void {\n    if (targetChange) {\n      targetChange.addedDocuments.forEach(\n        key => (this._syncedDocuments = this._syncedDocuments.add(key))\n      );\n      targetChange.modifiedDocuments.forEach(key => {\n        debugAssert(\n          this._syncedDocuments.has(key),\n          `Modified document ${key} not found in view.`\n        );\n      });\n      targetChange.removedDocuments.forEach(\n        key => (this._syncedDocuments = this._syncedDocuments.delete(key))\n      );\n      this.current = targetChange.current;\n    }\n  }\n\n  private updateLimboDocuments(): LimboDocumentChange[] {\n    // We can only determine limbo documents when we're in-sync with the server.\n    if (!this.current) {\n      return [];\n    }\n\n    // TODO(klimt): Do this incrementally so that it's not quadratic when\n    // updating many documents.\n    const oldLimboDocuments = this.limboDocuments;\n    this.limboDocuments = documentKeySet();\n    this.documentSet.forEach(doc => {\n      if (this.shouldBeInLimbo(doc.key)) {\n        this.limboDocuments = this.limboDocuments.add(doc.key);\n      }\n    });\n\n    // Diff the new limbo docs with the old limbo docs.\n    const changes: LimboDocumentChange[] = [];\n    oldLimboDocuments.forEach(key => {\n      if (!this.limboDocuments.has(key)) {\n        changes.push(new RemovedLimboDocument(key));\n      }\n    });\n    this.limboDocuments.forEach(key => {\n      if (!oldLimboDocuments.has(key)) {\n        changes.push(new AddedLimboDocument(key));\n      }\n    });\n    return changes;\n  }\n\n  /**\n   * Update the in-memory state of the current view with the state read from\n   * persistence.\n   *\n   * We update the query view whenever a client's primary status changes:\n   * - When a client transitions from primary to secondary, it can miss\n   *   LocalStorage updates and its query views may temporarily not be\n   *   synchronized with the state on disk.\n   * - For secondary to primary transitions, the client needs to update the list\n   *   of `syncedDocuments` since secondary clients update their query views\n   *   based purely on synthesized RemoteEvents.\n   *\n   * @param queryResult.documents - The documents that match the query according\n   * to the LocalStore.\n   * @param queryResult.remoteKeys - The keys of the documents that match the\n   * query according to the backend.\n   *\n   * @return The ViewChange that resulted from this synchronization.\n   */\n  // PORTING NOTE: Multi-tab only.\n  synchronizeWithPersistedState(queryResult: QueryResult): ViewChange {\n    this._syncedDocuments = queryResult.remoteKeys;\n    this.limboDocuments = documentKeySet();\n    const docChanges = this.computeDocChanges(queryResult.documents);\n    return this.applyChanges(docChanges, /*updateLimboDocuments=*/ true);\n  }\n\n  /**\n   * Returns a view snapshot as if this query was just listened to. Contains\n   * a document add for every existing document and the `fromCache` and\n   * `hasPendingWrites` status of the already established view.\n   */\n  // PORTING NOTE: Multi-tab only.\n  computeInitialSnapshot(): ViewSnapshot {\n    return ViewSnapshot.fromInitialDocuments(\n      this.query,\n      this.documentSet,\n      this.mutatedKeys,\n      this.syncState === SyncState.Local\n    );\n  }\n}\n\nfunction compareChangeType(c1: ChangeType, c2: ChangeType): number {\n  const order = (change: ChangeType): 0 | 1 | 2 => {\n    switch (change) {\n      case ChangeType.Added:\n        return 1;\n      case ChangeType.Modified:\n        return 2;\n      case ChangeType.Metadata:\n        // A metadata change is converted to a modified change at the public\n        // api layer.  Since we sort by document key and then change type,\n        // metadata and modified changes must be sorted equivalently.\n        return 2;\n      case ChangeType.Removed:\n        return 0;\n      default:\n        return fail('Unknown ChangeType: ' + change);\n    }\n  };\n\n  return order(c1) - order(c2);\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { User } from '../auth/user';\nimport {\n  ignoreIfPrimaryLeaseLoss,\n  LocalStore,\n  MultiTabLocalStore\n} from '../local/local_store';\nimport { LocalViewChanges } from '../local/local_view_changes';\nimport { ReferenceSet } from '../local/reference_set';\nimport { TargetData, TargetPurpose } from '../local/target_data';\nimport {\n  documentKeySet,\n  DocumentKeySet,\n  MaybeDocumentMap\n} from '../model/collections';\nimport { MaybeDocument, NoDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { Mutation } from '../model/mutation';\nimport { BATCHID_UNKNOWN, MutationBatchResult } from '../model/mutation_batch';\nimport { RemoteEvent, TargetChange } from '../remote/remote_event';\nimport { RemoteStore } from '../remote/remote_store';\nimport { RemoteSyncer } from '../remote/remote_syncer';\nimport { debugAssert, fail, hardAssert } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { logDebug } from '../util/log';\nimport { primitiveComparator } from '../util/misc';\nimport { ObjectMap } from '../util/obj_map';\nimport { Deferred } from '../util/promise';\nimport { SortedMap } from '../util/sorted_map';\n\nimport { ClientId, SharedClientState } from '../local/shared_client_state';\nimport {\n  QueryTargetState,\n  SharedClientStateSyncer\n} from '../local/shared_client_state_syncer';\nimport { SortedSet } from '../util/sorted_set';\nimport { ListenSequence } from './listen_sequence';\nimport { LimitType, Query } from './query';\nimport { SnapshotVersion } from './snapshot_version';\nimport { Target } from './target';\nimport { TargetIdGenerator } from './target_id_generator';\nimport { Transaction } from './transaction';\nimport {\n  BatchId,\n  MutationBatchState,\n  OnlineState,\n  OnlineStateSource,\n  TargetId\n} from './types';\nimport {\n  AddedLimboDocument,\n  LimboDocumentChange,\n  RemovedLimboDocument,\n  View,\n  ViewChange,\n  ViewDocumentChanges\n} from './view';\nimport { ViewSnapshot } from './view_snapshot';\nimport { AsyncQueue, wrapInUserErrorIfRecoverable } from '../util/async_queue';\nimport { TransactionRunner } from './transaction_runner';\n\nconst LOG_TAG = 'SyncEngine';\n\n/**\n * QueryView contains all of the data that SyncEngine needs to keep track of for\n * a particular query.\n */\nclass QueryView {\n  constructor(\n    /**\n     * The query itself.\n     */\n    public query: Query,\n    /**\n     * The target number created by the client that is used in the watch\n     * stream to identify this query.\n     */\n    public targetId: TargetId,\n    /**\n     * The view is responsible for computing the final merged truth of what\n     * docs are in the query. It gets notified of local and remote changes,\n     * and applies the query filters and limits to determine the most correct\n     * possible results.\n     */\n    public view: View\n  ) {}\n}\n\n/** Tracks a limbo resolution. */\nclass LimboResolution {\n  constructor(public key: DocumentKey) {}\n\n  /**\n   * Set to true once we've received a document. This is used in\n   * getRemoteKeysForTarget() and ultimately used by WatchChangeAggregator to\n   * decide whether it needs to manufacture a delete event for the target once\n   * the target is CURRENT.\n   */\n  receivedDocument: boolean = false;\n}\n\n/**\n * Interface implemented by EventManager to handle notifications from\n * SyncEngine.\n */\nexport interface SyncEngineListener {\n  /** Handles new view snapshots. */\n  onWatchChange(snapshots: ViewSnapshot[]): void;\n\n  /** Handles the failure of a query. */\n  onWatchError(query: Query, error: Error): void;\n\n  /** Handles a change in online state. */\n  onOnlineStateChange(onlineState: OnlineState): void;\n}\n\n/**\n * SyncEngine is the central controller in the client SDK architecture. It is\n * the glue code between the EventManager, LocalStore, and RemoteStore. Some of\n * SyncEngine's responsibilities include:\n * 1. Coordinating client requests and remote events between the EventManager\n *    and the local and remote data stores.\n * 2. Managing a View object for each query, providing the unified view between\n *    the local and remote data stores.\n * 3. Notifying the RemoteStore when the LocalStore has new mutations in its\n *    queue that need sending to the backend.\n *\n * The SyncEngine’s methods should only ever be called by methods running in the\n * global async queue.\n */\nexport class SyncEngine implements RemoteSyncer {\n  protected syncEngineListener: SyncEngineListener | null = null;\n\n  protected queryViewsByQuery = new ObjectMap<Query, QueryView>(q =>\n    q.canonicalId()\n  );\n  protected queriesByTarget = new Map<TargetId, Query[]>();\n  /**\n   * The keys of documents that are in limbo for which we haven't yet started a\n   * limbo resolution query.\n   */\n  private enqueuedLimboResolutions: DocumentKey[] = [];\n  /**\n   * Keeps track of the target ID for each document that is in limbo with an\n   * active target.\n   */\n  protected activeLimboTargetsByKey = new SortedMap<DocumentKey, TargetId>(\n    DocumentKey.comparator\n  );\n  /**\n   * Keeps track of the information about an active limbo resolution for each\n   * active target ID that was started for the purpose of limbo resolution.\n   */\n  protected activeLimboResolutionsByTarget = new Map<\n    TargetId,\n    LimboResolution\n  >();\n  protected limboDocumentRefs = new ReferenceSet();\n  /** Stores user completion handlers, indexed by User and BatchId. */\n  private mutationUserCallbacks = {} as {\n    [uidKey: string]: SortedMap<BatchId, Deferred<void>>;\n  };\n  /** Stores user callbacks waiting for all pending writes to be acknowledged. */\n  private pendingWritesCallbacks = new Map<BatchId, Array<Deferred<void>>>();\n  private limboTargetIdGenerator = TargetIdGenerator.forSyncEngine();\n\n  private onlineState = OnlineState.Unknown;\n\n  constructor(\n    protected localStore: LocalStore,\n    protected remoteStore: RemoteStore,\n    // PORTING NOTE: Manages state synchronization in multi-tab environments.\n    protected sharedClientState: SharedClientState,\n    private currentUser: User,\n    private maxConcurrentLimboResolutions: number\n  ) {}\n\n  get isPrimaryClient(): boolean {\n    return true;\n  }\n\n  /** Subscribes to SyncEngine notifications. Has to be called exactly once. */\n  subscribe(syncEngineListener: SyncEngineListener): void {\n    debugAssert(\n      syncEngineListener !== null,\n      'SyncEngine listener cannot be null'\n    );\n    debugAssert(\n      this.syncEngineListener === null,\n      'SyncEngine already has a subscriber.'\n    );\n\n    this.syncEngineListener = syncEngineListener;\n  }\n\n  /**\n   * Initiates the new listen, resolves promise when listen enqueued to the\n   * server. All the subsequent view snapshots or errors are sent to the\n   * subscribed handlers. Returns the initial snapshot.\n   */\n  async listen(query: Query): Promise<ViewSnapshot> {\n    this.assertSubscribed('listen()');\n\n    let targetId;\n    let viewSnapshot;\n\n    const queryView = this.queryViewsByQuery.get(query);\n    if (queryView) {\n      // PORTING NOTE: With Multi-Tab Web, it is possible that a query view\n      // already exists when EventManager calls us for the first time. This\n      // happens when the primary tab is already listening to this query on\n      // behalf of another tab and the user of the primary also starts listening\n      // to the query. EventManager will not have an assigned target ID in this\n      // case and calls `listen` to obtain this ID.\n      targetId = queryView.targetId;\n      this.sharedClientState.addLocalQueryTarget(targetId);\n      viewSnapshot = queryView.view.computeInitialSnapshot();\n    } else {\n      const targetData = await this.localStore.allocateTarget(query.toTarget());\n\n      const status = this.sharedClientState.addLocalQueryTarget(\n        targetData.targetId\n      );\n      targetId = targetData.targetId;\n      viewSnapshot = await this.initializeViewAndComputeSnapshot(\n        query,\n        targetId,\n        status === 'current'\n      );\n      if (this.isPrimaryClient) {\n        this.remoteStore.listen(targetData);\n      }\n    }\n\n    return viewSnapshot;\n  }\n\n  /**\n   * Registers a view for a previously unknown query and computes its initial\n   * snapshot.\n   */\n  protected async initializeViewAndComputeSnapshot(\n    query: Query,\n    targetId: TargetId,\n    current: boolean\n  ): Promise<ViewSnapshot> {\n    const queryResult = await this.localStore.executeQuery(\n      query,\n      /* usePreviousResults= */ true\n    );\n    const view = new View(query, queryResult.remoteKeys);\n    const viewDocChanges = view.computeDocChanges(queryResult.documents);\n    const synthesizedTargetChange = TargetChange.createSynthesizedTargetChangeForCurrentChange(\n      targetId,\n      current && this.onlineState !== OnlineState.Offline\n    );\n    const viewChange = view.applyChanges(\n      viewDocChanges,\n      /* updateLimboDocuments= */ this.isPrimaryClient,\n      synthesizedTargetChange\n    );\n    this.updateTrackedLimbos(targetId, viewChange.limboChanges);\n\n    debugAssert(\n      !!viewChange.snapshot,\n      'applyChanges for new view should always return a snapshot'\n    );\n\n    const data = new QueryView(query, targetId, view);\n    this.queryViewsByQuery.set(query, data);\n    if (this.queriesByTarget.has(targetId)) {\n      this.queriesByTarget.get(targetId)!.push(query);\n    } else {\n      this.queriesByTarget.set(targetId, [query]);\n    }\n    return viewChange.snapshot!;\n  }\n\n  /** Stops listening to the query. */\n  async unlisten(query: Query): Promise<void> {\n    this.assertSubscribed('unlisten()');\n\n    const queryView = this.queryViewsByQuery.get(query)!;\n    debugAssert(!!queryView, 'Trying to unlisten on query not found:' + query);\n\n    // Only clean up the query view and target if this is the only query mapped\n    // to the target.\n    const queries = this.queriesByTarget.get(queryView.targetId)!;\n    if (queries.length > 1) {\n      this.queriesByTarget.set(\n        queryView.targetId,\n        queries.filter(q => !q.isEqual(query))\n      );\n      this.queryViewsByQuery.delete(query);\n      return;\n    }\n\n    // No other queries are mapped to the target, clean up the query and the target.\n    if (this.isPrimaryClient) {\n      // We need to remove the local query target first to allow us to verify\n      // whether any other client is still interested in this target.\n      this.sharedClientState.removeLocalQueryTarget(queryView.targetId);\n      const targetRemainsActive = this.sharedClientState.isActiveQueryTarget(\n        queryView.targetId\n      );\n\n      if (!targetRemainsActive) {\n        await this.localStore\n          .releaseTarget(queryView.targetId, /*keepPersistedTargetData=*/ false)\n          .then(() => {\n            this.sharedClientState.clearQueryState(queryView.targetId);\n            this.remoteStore.unlisten(queryView.targetId);\n            this.removeAndCleanupTarget(queryView.targetId);\n          })\n          .catch(ignoreIfPrimaryLeaseLoss);\n      }\n    } else {\n      this.removeAndCleanupTarget(queryView.targetId);\n      await this.localStore.releaseTarget(\n        queryView.targetId,\n        /*keepPersistedTargetData=*/ true\n      );\n    }\n  }\n\n  /**\n   * Initiates the write of local mutation batch which involves adding the\n   * writes to the mutation queue, notifying the remote store about new\n   * mutations and raising events for any changes this write caused.\n   *\n   * The promise returned by this call is resolved when the above steps\n   * have completed, *not* when the write was acked by the backend. The\n   * userCallback is resolved once the write was acked/rejected by the\n   * backend (or failed locally for any other reason).\n   */\n  async write(batch: Mutation[], userCallback: Deferred<void>): Promise<void> {\n    this.assertSubscribed('write()');\n\n    try {\n      const result = await this.localStore.localWrite(batch);\n      this.sharedClientState.addPendingMutation(result.batchId);\n      this.addMutationCallback(result.batchId, userCallback);\n      await this.emitNewSnapsAndNotifyLocalStore(result.changes);\n      await this.remoteStore.fillWritePipeline();\n    } catch (e) {\n      // If we can't persist the mutation, we reject the user callback and\n      // don't send the mutation. The user can then retry the write.\n      const error = wrapInUserErrorIfRecoverable(e, `Failed to persist write`);\n      userCallback.reject(error);\n    }\n  }\n\n  /**\n   * Takes an updateFunction in which a set of reads and writes can be performed\n   * atomically. In the updateFunction, the client can read and write values\n   * using the supplied transaction object. After the updateFunction, all\n   * changes will be committed. If a retryable error occurs (ex: some other\n   * client has changed any of the data referenced), then the updateFunction\n   * will be called again after a backoff. If the updateFunction still fails\n   * after all retries, then the transaction will be rejected.\n   *\n   * The transaction object passed to the updateFunction contains methods for\n   * accessing documents and collections. Unlike other datastore access, data\n   * accessed with the transaction will not reflect local changes that have not\n   * been committed. For this reason, it is required that all reads are\n   * performed before any writes. Transactions must be performed while online.\n   *\n   * The Deferred input is resolved when the transaction is fully committed.\n   */\n  runTransaction<T>(\n    asyncQueue: AsyncQueue,\n    updateFunction: (transaction: Transaction) => Promise<T>,\n    deferred: Deferred<T>\n  ): void {\n    new TransactionRunner<T>(\n      asyncQueue,\n      this.remoteStore,\n      updateFunction,\n      deferred\n    ).run();\n  }\n\n  async applyRemoteEvent(remoteEvent: RemoteEvent): Promise<void> {\n    this.assertSubscribed('applyRemoteEvent()');\n    try {\n      const changes = await this.localStore.applyRemoteEvent(remoteEvent);\n      // Update `receivedDocument` as appropriate for any limbo targets.\n      remoteEvent.targetChanges.forEach((targetChange, targetId) => {\n        const limboResolution = this.activeLimboResolutionsByTarget.get(\n          targetId\n        );\n        if (limboResolution) {\n          // Since this is a limbo resolution lookup, it's for a single document\n          // and it could be added, modified, or removed, but not a combination.\n          hardAssert(\n            targetChange.addedDocuments.size +\n              targetChange.modifiedDocuments.size +\n              targetChange.removedDocuments.size <=\n              1,\n            'Limbo resolution for single document contains multiple changes.'\n          );\n          if (targetChange.addedDocuments.size > 0) {\n            limboResolution.receivedDocument = true;\n          } else if (targetChange.modifiedDocuments.size > 0) {\n            hardAssert(\n              limboResolution.receivedDocument,\n              'Received change for limbo target document without add.'\n            );\n          } else if (targetChange.removedDocuments.size > 0) {\n            hardAssert(\n              limboResolution.receivedDocument,\n              'Received remove for limbo target document without add.'\n            );\n            limboResolution.receivedDocument = false;\n          } else {\n            // This was probably just a CURRENT targetChange or similar.\n          }\n        }\n      });\n      await this.emitNewSnapsAndNotifyLocalStore(changes, remoteEvent);\n    } catch (error) {\n      await ignoreIfPrimaryLeaseLoss(error);\n    }\n  }\n\n  /**\n   * Applies an OnlineState change to the sync engine and notifies any views of\n   * the change.\n   */\n  applyOnlineStateChange(\n    onlineState: OnlineState,\n    source: OnlineStateSource\n  ): void {\n    this.assertSubscribed('applyOnlineStateChange()');\n    const newViewSnapshots = [] as ViewSnapshot[];\n    this.queryViewsByQuery.forEach((query, queryView) => {\n      const viewChange = queryView.view.applyOnlineStateChange(onlineState);\n      debugAssert(\n        viewChange.limboChanges.length === 0,\n        'OnlineState should not affect limbo documents.'\n      );\n      if (viewChange.snapshot) {\n        newViewSnapshots.push(viewChange.snapshot);\n      }\n    });\n    this.syncEngineListener!.onOnlineStateChange(onlineState);\n    this.syncEngineListener!.onWatchChange(newViewSnapshots);\n    this.onlineState = onlineState;\n  }\n\n  async rejectListen(targetId: TargetId, err: FirestoreError): Promise<void> {\n    this.assertSubscribed('rejectListens()');\n\n    // PORTING NOTE: Multi-tab only.\n    this.sharedClientState.updateQueryState(targetId, 'rejected', err);\n\n    const limboResolution = this.activeLimboResolutionsByTarget.get(targetId);\n    const limboKey = limboResolution && limboResolution.key;\n    if (limboKey) {\n      // TODO(klimt): We really only should do the following on permission\n      // denied errors, but we don't have the cause code here.\n\n      // It's a limbo doc. Create a synthetic event saying it was deleted.\n      // This is kind of a hack. Ideally, we would have a method in the local\n      // store to purge a document. However, it would be tricky to keep all of\n      // the local store's invariants with another method.\n      let documentUpdates = new SortedMap<DocumentKey, MaybeDocument>(\n        DocumentKey.comparator\n      );\n      documentUpdates = documentUpdates.insert(\n        limboKey,\n        new NoDocument(limboKey, SnapshotVersion.min())\n      );\n      const resolvedLimboDocuments = documentKeySet().add(limboKey);\n      const event = new RemoteEvent(\n        SnapshotVersion.min(),\n        /* targetChanges= */ new Map<TargetId, TargetChange>(),\n        /* targetMismatches= */ new SortedSet<TargetId>(primitiveComparator),\n        documentUpdates,\n        resolvedLimboDocuments\n      );\n\n      await this.applyRemoteEvent(event);\n\n      // Since this query failed, we won't want to manually unlisten to it.\n      // We only remove it from bookkeeping after we successfully applied the\n      // RemoteEvent. If `applyRemoteEvent()` throws, we want to re-listen to\n      // this query when the RemoteStore restarts the Watch stream, which should\n      // re-trigger the target failure.\n      this.activeLimboTargetsByKey = this.activeLimboTargetsByKey.remove(\n        limboKey\n      );\n      this.activeLimboResolutionsByTarget.delete(targetId);\n      this.pumpEnqueuedLimboResolutions();\n    } else {\n      await this.localStore\n        .releaseTarget(targetId, /* keepPersistedTargetData */ false)\n        .then(() => this.removeAndCleanupTarget(targetId, err))\n        .catch(ignoreIfPrimaryLeaseLoss);\n    }\n  }\n\n  async applySuccessfulWrite(\n    mutationBatchResult: MutationBatchResult\n  ): Promise<void> {\n    this.assertSubscribed('applySuccessfulWrite()');\n\n    const batchId = mutationBatchResult.batch.batchId;\n\n    // The local store may or may not be able to apply the write result and\n    // raise events immediately (depending on whether the watcher is caught\n    // up), so we raise user callbacks first so that they consistently happen\n    // before listen events.\n    this.processUserCallback(batchId, /*error=*/ null);\n\n    this.triggerPendingWritesCallbacks(batchId);\n\n    try {\n      const changes = await this.localStore.acknowledgeBatch(\n        mutationBatchResult\n      );\n      this.sharedClientState.updateMutationState(batchId, 'acknowledged');\n      await this.emitNewSnapsAndNotifyLocalStore(changes);\n    } catch (error) {\n      await ignoreIfPrimaryLeaseLoss(error);\n    }\n  }\n\n  async rejectFailedWrite(\n    batchId: BatchId,\n    error: FirestoreError\n  ): Promise<void> {\n    this.assertSubscribed('rejectFailedWrite()');\n\n    // The local store may or may not be able to apply the write result and\n    // raise events immediately (depending on whether the watcher is caught up),\n    // so we raise user callbacks first so that they consistently happen before\n    // listen events.\n    this.processUserCallback(batchId, error);\n\n    this.triggerPendingWritesCallbacks(batchId);\n\n    try {\n      const changes = await this.localStore.rejectBatch(batchId);\n      this.sharedClientState.updateMutationState(batchId, 'rejected', error);\n      await this.emitNewSnapsAndNotifyLocalStore(changes);\n    } catch (error) {\n      await ignoreIfPrimaryLeaseLoss(error);\n    }\n  }\n\n  /**\n   * Registers a user callback that resolves when all pending mutations at the moment of calling\n   * are acknowledged .\n   */\n  async registerPendingWritesCallback(callback: Deferred<void>): Promise<void> {\n    if (!this.remoteStore.canUseNetwork()) {\n      logDebug(\n        LOG_TAG,\n        'The network is disabled. The task returned by ' +\n          \"'awaitPendingWrites()' will not complete until the network is enabled.\"\n      );\n    }\n\n    try {\n      const highestBatchId = await this.localStore.getHighestUnacknowledgedBatchId();\n      if (highestBatchId === BATCHID_UNKNOWN) {\n        // Trigger the callback right away if there is no pending writes at the moment.\n        callback.resolve();\n        return;\n      }\n\n      const callbacks = this.pendingWritesCallbacks.get(highestBatchId) || [];\n      callbacks.push(callback);\n      this.pendingWritesCallbacks.set(highestBatchId, callbacks);\n    } catch (e) {\n      const firestoreError = wrapInUserErrorIfRecoverable(\n        e,\n        'Initialization of waitForPendingWrites() operation failed'\n      );\n      callback.reject(firestoreError);\n    }\n  }\n\n  /**\n   * Triggers the callbacks that are waiting for this batch id to get acknowledged by server,\n   * if there are any.\n   */\n  private triggerPendingWritesCallbacks(batchId: BatchId): void {\n    (this.pendingWritesCallbacks.get(batchId) || []).forEach(callback => {\n      callback.resolve();\n    });\n\n    this.pendingWritesCallbacks.delete(batchId);\n  }\n\n  /** Reject all outstanding callbacks waiting for pending writes to complete. */\n  private rejectOutstandingPendingWritesCallbacks(errorMessage: string): void {\n    this.pendingWritesCallbacks.forEach(callbacks => {\n      callbacks.forEach(callback => {\n        callback.reject(new FirestoreError(Code.CANCELLED, errorMessage));\n      });\n    });\n\n    this.pendingWritesCallbacks.clear();\n  }\n\n  private addMutationCallback(\n    batchId: BatchId,\n    callback: Deferred<void>\n  ): void {\n    let newCallbacks = this.mutationUserCallbacks[this.currentUser.toKey()];\n    if (!newCallbacks) {\n      newCallbacks = new SortedMap<BatchId, Deferred<void>>(\n        primitiveComparator\n      );\n    }\n    newCallbacks = newCallbacks.insert(batchId, callback);\n    this.mutationUserCallbacks[this.currentUser.toKey()] = newCallbacks;\n  }\n\n  /**\n   * Resolves or rejects the user callback for the given batch and then discards\n   * it.\n   */\n  protected processUserCallback(batchId: BatchId, error: Error | null): void {\n    let newCallbacks = this.mutationUserCallbacks[this.currentUser.toKey()];\n\n    // NOTE: Mutations restored from persistence won't have callbacks, so it's\n    // okay for there to be no callback for this ID.\n    if (newCallbacks) {\n      const callback = newCallbacks.get(batchId);\n      if (callback) {\n        debugAssert(\n          batchId === newCallbacks.minKey(),\n          'Mutation callbacks processed out-of-order?'\n        );\n        if (error) {\n          callback.reject(error);\n        } else {\n          callback.resolve();\n        }\n        newCallbacks = newCallbacks.remove(batchId);\n      }\n      this.mutationUserCallbacks[this.currentUser.toKey()] = newCallbacks;\n    }\n  }\n\n  protected removeAndCleanupTarget(\n    targetId: number,\n    error: Error | null = null\n  ): void {\n    this.sharedClientState.removeLocalQueryTarget(targetId);\n\n    debugAssert(\n      this.queriesByTarget.has(targetId) &&\n        this.queriesByTarget.get(targetId)!.length !== 0,\n      `There are no queries mapped to target id ${targetId}`\n    );\n\n    for (const query of this.queriesByTarget.get(targetId)!) {\n      this.queryViewsByQuery.delete(query);\n      if (error) {\n        this.syncEngineListener!.onWatchError(query, error);\n      }\n    }\n\n    this.queriesByTarget.delete(targetId);\n\n    if (this.isPrimaryClient) {\n      const limboKeys = this.limboDocumentRefs.removeReferencesForId(targetId);\n      limboKeys.forEach(limboKey => {\n        const isReferenced = this.limboDocumentRefs.containsKey(limboKey);\n        if (!isReferenced) {\n          // We removed the last reference for this key\n          this.removeLimboTarget(limboKey);\n        }\n      });\n    }\n  }\n\n  private removeLimboTarget(key: DocumentKey): void {\n    // It's possible that the target already got removed because the query failed. In that case,\n    // the key won't exist in `limboTargetsByKey`. Only do the cleanup if we still have the target.\n    const limboTargetId = this.activeLimboTargetsByKey.get(key);\n    if (limboTargetId === null) {\n      // This target already got removed, because the query failed.\n      return;\n    }\n\n    this.remoteStore.unlisten(limboTargetId);\n    this.activeLimboTargetsByKey = this.activeLimboTargetsByKey.remove(key);\n    this.activeLimboResolutionsByTarget.delete(limboTargetId);\n    this.pumpEnqueuedLimboResolutions();\n  }\n\n  protected updateTrackedLimbos(\n    targetId: TargetId,\n    limboChanges: LimboDocumentChange[]\n  ): void {\n    for (const limboChange of limboChanges) {\n      if (limboChange instanceof AddedLimboDocument) {\n        this.limboDocumentRefs.addReference(limboChange.key, targetId);\n        this.trackLimboChange(limboChange);\n      } else if (limboChange instanceof RemovedLimboDocument) {\n        logDebug(LOG_TAG, 'Document no longer in limbo: ' + limboChange.key);\n        this.limboDocumentRefs.removeReference(limboChange.key, targetId);\n        const isReferenced = this.limboDocumentRefs.containsKey(\n          limboChange.key\n        );\n        if (!isReferenced) {\n          // We removed the last reference for this key\n          this.removeLimboTarget(limboChange.key);\n        }\n      } else {\n        fail('Unknown limbo change: ' + JSON.stringify(limboChange));\n      }\n    }\n  }\n\n  private trackLimboChange(limboChange: AddedLimboDocument): void {\n    const key = limboChange.key;\n    if (!this.activeLimboTargetsByKey.get(key)) {\n      logDebug(LOG_TAG, 'New document in limbo: ' + key);\n      this.enqueuedLimboResolutions.push(key);\n      this.pumpEnqueuedLimboResolutions();\n    }\n  }\n\n  /**\n   * Starts listens for documents in limbo that are enqueued for resolution,\n   * subject to a maximum number of concurrent resolutions.\n   *\n   * Without bounding the number of concurrent resolutions, the server can fail\n   * with \"resource exhausted\" errors which can lead to pathological client\n   * behavior as seen in https://github.com/firebase/firebase-js-sdk/issues/2683.\n   */\n  private pumpEnqueuedLimboResolutions(): void {\n    while (\n      this.enqueuedLimboResolutions.length > 0 &&\n      this.activeLimboTargetsByKey.size < this.maxConcurrentLimboResolutions\n    ) {\n      const key = this.enqueuedLimboResolutions.shift()!;\n      const limboTargetId = this.limboTargetIdGenerator.next();\n      this.activeLimboResolutionsByTarget.set(\n        limboTargetId,\n        new LimboResolution(key)\n      );\n      this.activeLimboTargetsByKey = this.activeLimboTargetsByKey.insert(\n        key,\n        limboTargetId\n      );\n      this.remoteStore.listen(\n        new TargetData(\n          Query.atPath(key.path).toTarget(),\n          limboTargetId,\n          TargetPurpose.LimboResolution,\n          ListenSequence.INVALID\n        )\n      );\n    }\n  }\n\n  // Visible for testing\n  activeLimboDocumentResolutions(): SortedMap<DocumentKey, TargetId> {\n    return this.activeLimboTargetsByKey;\n  }\n\n  // Visible for testing\n  enqueuedLimboDocumentResolutions(): DocumentKey[] {\n    return this.enqueuedLimboResolutions;\n  }\n\n  protected async emitNewSnapsAndNotifyLocalStore(\n    changes: MaybeDocumentMap,\n    remoteEvent?: RemoteEvent\n  ): Promise<void> {\n    const newSnaps: ViewSnapshot[] = [];\n    const docChangesInAllViews: LocalViewChanges[] = [];\n    const queriesProcessed: Array<Promise<void>> = [];\n\n    this.queryViewsByQuery.forEach((_, queryView) => {\n      queriesProcessed.push(\n        Promise.resolve()\n          .then(() => {\n            const viewDocChanges = queryView.view.computeDocChanges(changes);\n            if (!viewDocChanges.needsRefill) {\n              return viewDocChanges;\n            }\n            // The query has a limit and some docs were removed, so we need\n            // to re-run the query against the local store to make sure we\n            // didn't lose any good docs that had been past the limit.\n            return this.localStore\n              .executeQuery(queryView.query, /* usePreviousResults= */ false)\n              .then(({ documents }) => {\n                return queryView.view.computeDocChanges(\n                  documents,\n                  viewDocChanges\n                );\n              });\n          })\n          .then((viewDocChanges: ViewDocumentChanges) => {\n            const targetChange =\n              remoteEvent && remoteEvent.targetChanges.get(queryView.targetId);\n            const viewChange = queryView.view.applyChanges(\n              viewDocChanges,\n              /* updateLimboDocuments= */ this.isPrimaryClient,\n              targetChange\n            );\n            this.updateTrackedLimbos(\n              queryView.targetId,\n              viewChange.limboChanges\n            );\n            if (viewChange.snapshot) {\n              if (this.isPrimaryClient) {\n                this.sharedClientState.updateQueryState(\n                  queryView.targetId,\n                  viewChange.snapshot.fromCache ? 'not-current' : 'current'\n                );\n              }\n\n              newSnaps.push(viewChange.snapshot);\n              const docChanges = LocalViewChanges.fromSnapshot(\n                queryView.targetId,\n                viewChange.snapshot\n              );\n              docChangesInAllViews.push(docChanges);\n            }\n          })\n      );\n    });\n\n    await Promise.all(queriesProcessed);\n    this.syncEngineListener!.onWatchChange(newSnaps);\n    await this.localStore.notifyLocalViewChanges(docChangesInAllViews);\n  }\n\n  protected assertSubscribed(fnName: string): void {\n    debugAssert(\n      this.syncEngineListener !== null,\n      'Trying to call ' + fnName + ' before calling subscribe().'\n    );\n  }\n\n  async handleCredentialChange(user: User): Promise<void> {\n    const userChanged = !this.currentUser.isEqual(user);\n\n    if (userChanged) {\n      const result = await this.localStore.handleUserChange(user);\n      this.currentUser = user;\n\n      // Fails tasks waiting for pending writes requested by previous user.\n      this.rejectOutstandingPendingWritesCallbacks(\n        \"'waitForPendingWrites' promise is rejected due to a user change.\"\n      );\n      // TODO(b/114226417): Consider calling this only in the primary tab.\n      this.sharedClientState.handleUserChange(\n        user,\n        result.removedBatchIds,\n        result.addedBatchIds\n      );\n      await this.emitNewSnapsAndNotifyLocalStore(result.affectedDocuments);\n    }\n\n    await this.remoteStore.handleCredentialChange();\n  }\n\n  enableNetwork(): Promise<void> {\n    return this.remoteStore.enableNetwork();\n  }\n\n  disableNetwork(): Promise<void> {\n    return this.remoteStore.disableNetwork();\n  }\n\n  getRemoteKeysForTarget(targetId: TargetId): DocumentKeySet {\n    const limboResolution = this.activeLimboResolutionsByTarget.get(targetId);\n    if (limboResolution && limboResolution.receivedDocument) {\n      return documentKeySet().add(limboResolution.key);\n    } else {\n      let keySet = documentKeySet();\n      const queries = this.queriesByTarget.get(targetId);\n      if (!queries) {\n        return keySet;\n      }\n      for (const query of queries) {\n        const queryView = this.queryViewsByQuery.get(query);\n        debugAssert(!!queryView, `No query view found for ${query}`);\n        keySet = keySet.unionWith(queryView.view.syncedDocuments);\n      }\n      return keySet;\n    }\n  }\n}\n\n/**\n * An impplementation of SyncEngine that implement SharedClientStateSyncer for\n * Multi-Tab synchronization.\n */\n// PORTING NOTE: Web only\nexport class MultiTabSyncEngine extends SyncEngine\n  implements SharedClientStateSyncer {\n  // The primary state is set to `true` or `false` immediately after Firestore\n  // startup. In the interim, a client should only be considered primary if\n  // `isPrimary` is true.\n  private _isPrimaryClient: undefined | boolean = undefined;\n\n  constructor(\n    protected localStore: MultiTabLocalStore,\n    remoteStore: RemoteStore,\n    sharedClientState: SharedClientState,\n    currentUser: User,\n    maxConcurrentLimboResolutions: number\n  ) {\n    super(\n      localStore,\n      remoteStore,\n      sharedClientState,\n      currentUser,\n      maxConcurrentLimboResolutions\n    );\n  }\n\n  get isPrimaryClient(): boolean {\n    return this._isPrimaryClient === true;\n  }\n\n  enableNetwork(): Promise<void> {\n    this.localStore.setNetworkEnabled(true);\n    return super.enableNetwork();\n  }\n\n  disableNetwork(): Promise<void> {\n    this.localStore.setNetworkEnabled(false);\n    return super.disableNetwork();\n  }\n\n  /**\n   * Reconcile the list of synced documents in an existing view with those\n   * from persistence.\n   */\n  private async synchronizeViewAndComputeSnapshot(\n    queryView: QueryView\n  ): Promise<ViewChange> {\n    const queryResult = await this.localStore.executeQuery(\n      queryView.query,\n      /* usePreviousResults= */ true\n    );\n    const viewSnapshot = queryView.view.synchronizeWithPersistedState(\n      queryResult\n    );\n    if (this._isPrimaryClient) {\n      this.updateTrackedLimbos(queryView.targetId, viewSnapshot.limboChanges);\n    }\n    return viewSnapshot;\n  }\n\n  applyOnlineStateChange(\n    onlineState: OnlineState,\n    source: OnlineStateSource\n  ): void {\n    // If we are the primary client, the online state of all clients only\n    // depends on the online state of the local RemoteStore.\n    if (this.isPrimaryClient && source === OnlineStateSource.RemoteStore) {\n      super.applyOnlineStateChange(onlineState, source);\n      this.sharedClientState.setOnlineState(onlineState);\n    }\n\n    // If we are the secondary client, we explicitly ignore the remote store's\n    // online state (the local client may go offline, even though the primary\n    // tab remains online) and only apply the primary tab's online state from\n    // SharedClientState.\n    if (\n      !this.isPrimaryClient &&\n      source === OnlineStateSource.SharedClientState\n    ) {\n      super.applyOnlineStateChange(onlineState, source);\n    }\n  }\n\n  async applyBatchState(\n    batchId: BatchId,\n    batchState: MutationBatchState,\n    error?: FirestoreError\n  ): Promise<void> {\n    this.assertSubscribed('applyBatchState()');\n    const documents = await this.localStore.lookupMutationDocuments(batchId);\n\n    if (documents === null) {\n      // A throttled tab may not have seen the mutation before it was completed\n      // and removed from the mutation queue, in which case we won't have cached\n      // the affected documents. In this case we can safely ignore the update\n      // since that means we didn't apply the mutation locally at all (if we\n      // had, we would have cached the affected documents), and so we will just\n      // see any resulting document changes via normal remote document updates\n      // as applicable.\n      logDebug(LOG_TAG, 'Cannot apply mutation batch with id: ' + batchId);\n      return;\n    }\n\n    if (batchState === 'pending') {\n      // If we are the primary client, we need to send this write to the\n      // backend. Secondary clients will ignore these writes since their remote\n      // connection is disabled.\n      await this.remoteStore.fillWritePipeline();\n    } else if (batchState === 'acknowledged' || batchState === 'rejected') {\n      // NOTE: Both these methods are no-ops for batches that originated from\n      // other clients.\n      this.processUserCallback(batchId, error ? error : null);\n      this.localStore.removeCachedMutationBatchMetadata(batchId);\n    } else {\n      fail(`Unknown batchState: ${batchState}`);\n    }\n\n    await this.emitNewSnapsAndNotifyLocalStore(documents);\n  }\n\n  async applyPrimaryState(isPrimary: boolean): Promise<void> {\n    if (isPrimary === true && this._isPrimaryClient !== true) {\n      // Secondary tabs only maintain Views for their local listeners and the\n      // Views internal state may not be 100% populated (in particular\n      // secondary tabs don't track syncedDocuments, the set of documents the\n      // server considers to be in the target). So when a secondary becomes\n      // primary, we need to need to make sure that all views for all targets\n      // match the state on disk.\n      const activeTargets = this.sharedClientState.getAllActiveQueryTargets();\n      const activeQueries = await this.synchronizeQueryViewsAndRaiseSnapshots(\n        activeTargets.toArray(),\n        /*transitionToPrimary=*/ true\n      );\n      this._isPrimaryClient = true;\n      await this.remoteStore.applyPrimaryState(true);\n      for (const targetData of activeQueries) {\n        this.remoteStore.listen(targetData);\n      }\n    } else if (isPrimary === false && this._isPrimaryClient !== false) {\n      const activeTargets: TargetId[] = [];\n\n      let p = Promise.resolve();\n      this.queriesByTarget.forEach((_, targetId) => {\n        if (this.sharedClientState.isLocalQueryTarget(targetId)) {\n          activeTargets.push(targetId);\n        } else {\n          p = p.then(() => {\n            this.removeAndCleanupTarget(targetId);\n            return this.localStore.releaseTarget(\n              targetId,\n              /*keepPersistedTargetData=*/ true\n            );\n          });\n        }\n        this.remoteStore.unlisten(targetId);\n      });\n      await p;\n\n      await this.synchronizeQueryViewsAndRaiseSnapshots(\n        activeTargets,\n        /*transitionToPrimary=*/ false\n      );\n      this.resetLimboDocuments();\n      this._isPrimaryClient = false;\n      await this.remoteStore.applyPrimaryState(false);\n    }\n  }\n\n  private resetLimboDocuments(): void {\n    this.activeLimboResolutionsByTarget.forEach((_, targetId) => {\n      this.remoteStore.unlisten(targetId);\n    });\n    this.limboDocumentRefs.removeAllReferences();\n    this.activeLimboResolutionsByTarget = new Map<TargetId, LimboResolution>();\n    this.activeLimboTargetsByKey = new SortedMap<DocumentKey, TargetId>(\n      DocumentKey.comparator\n    );\n  }\n\n  /**\n   * Reconcile the query views of the provided query targets with the state from\n   * persistence. Raises snapshots for any changes that affect the local\n   * client and returns the updated state of all target's query data.\n   *\n   * @param targets the list of targets with views that need to be recomputed\n   * @param transitionToPrimary `true` iff the tab transitions from a secondary\n   * tab to a primary tab\n   */\n  private async synchronizeQueryViewsAndRaiseSnapshots(\n    targets: TargetId[],\n    transitionToPrimary: boolean\n  ): Promise<TargetData[]> {\n    const activeQueries: TargetData[] = [];\n    const newViewSnapshots: ViewSnapshot[] = [];\n    for (const targetId of targets) {\n      let targetData: TargetData;\n      const queries = this.queriesByTarget.get(targetId);\n\n      if (queries && queries.length !== 0) {\n        // For queries that have a local View, we need to update their state\n        // in LocalStore (as the resume token and the snapshot version\n        // might have changed) and reconcile their views with the persisted\n        // state (the list of syncedDocuments may have gotten out of sync).\n        await this.localStore.releaseTarget(\n          targetId,\n          /*keepPersistedTargetData=*/ true\n        );\n        targetData = await this.localStore.allocateTarget(\n          queries[0].toTarget()\n        );\n\n        for (const query of queries) {\n          const queryView = this.queryViewsByQuery.get(query);\n          debugAssert(!!queryView, `No query view found for ${query}`);\n\n          const viewChange = await this.synchronizeViewAndComputeSnapshot(\n            queryView\n          );\n          if (viewChange.snapshot) {\n            newViewSnapshots.push(viewChange.snapshot);\n          }\n        }\n      } else {\n        debugAssert(\n          transitionToPrimary,\n          'A secondary tab should never have an active target without an active query.'\n        );\n        // For queries that never executed on this client, we need to\n        // allocate the target in LocalStore and initialize a new View.\n        const target = await this.localStore.getTarget(targetId);\n        debugAssert(!!target, `Target for id ${targetId} not found`);\n        targetData = await this.localStore.allocateTarget(target);\n        await this.initializeViewAndComputeSnapshot(\n          this.synthesizeTargetToQuery(target!),\n          targetId,\n          /*current=*/ false\n        );\n      }\n\n      activeQueries.push(targetData!);\n    }\n\n    this.syncEngineListener!.onWatchChange(newViewSnapshots);\n    return activeQueries;\n  }\n\n  /**\n   * Creates a `Query` object from the specified `Target`. There is no way to\n   * obtain the original `Query`, so we synthesize a `Query` from the `Target`\n   * object.\n   *\n   * The synthesized result might be different from the original `Query`, but\n   * since the synthesized `Query` should return the same results as the\n   * original one (only the presentation of results might differ), the potential\n   * difference will not cause issues.\n   */\n  private synthesizeTargetToQuery(target: Target): Query {\n    return new Query(\n      target.path,\n      target.collectionGroup,\n      target.orderBy,\n      target.filters,\n      target.limit,\n      LimitType.First,\n      target.startAt,\n      target.endAt\n    );\n  }\n\n  getActiveClients(): Promise<ClientId[]> {\n    return this.localStore.getActiveClients();\n  }\n\n  async applyTargetState(\n    targetId: TargetId,\n    state: QueryTargetState,\n    error?: FirestoreError\n  ): Promise<void> {\n    if (this._isPrimaryClient) {\n      // If we receive a target state notification via WebStorage, we are\n      // either already secondary or another tab has taken the primary lease.\n      logDebug(LOG_TAG, 'Ignoring unexpected query state notification.');\n      return;\n    }\n\n    if (this.queriesByTarget.has(targetId)) {\n      switch (state) {\n        case 'current':\n        case 'not-current': {\n          const changes = await this.localStore.getNewDocumentChanges();\n          const synthesizedRemoteEvent = RemoteEvent.createSynthesizedRemoteEventForCurrentChange(\n            targetId,\n            state === 'current'\n          );\n          await this.emitNewSnapsAndNotifyLocalStore(\n            changes,\n            synthesizedRemoteEvent\n          );\n          break;\n        }\n        case 'rejected': {\n          await this.localStore.releaseTarget(\n            targetId,\n            /* keepPersistedTargetData */ true\n          );\n          this.removeAndCleanupTarget(targetId, error);\n          break;\n        }\n        default:\n          fail('Unexpected target state: ' + state);\n      }\n    }\n  }\n\n  async applyActiveTargetsChange(\n    added: TargetId[],\n    removed: TargetId[]\n  ): Promise<void> {\n    if (!this._isPrimaryClient) {\n      return;\n    }\n\n    for (const targetId of added) {\n      if (this.queriesByTarget.has(targetId)) {\n        // A target might have been added in a previous attempt\n        logDebug(LOG_TAG, 'Adding an already active target ' + targetId);\n        continue;\n      }\n\n      const target = await this.localStore.getTarget(targetId);\n      debugAssert(\n        !!target,\n        `Query data for active target ${targetId} not found`\n      );\n      const targetData = await this.localStore.allocateTarget(target);\n      await this.initializeViewAndComputeSnapshot(\n        this.synthesizeTargetToQuery(target),\n        targetData.targetId,\n        /*current=*/ false\n      );\n      this.remoteStore.listen(targetData);\n    }\n\n    for (const targetId of removed) {\n      // Check that the target is still active since the target might have been\n      // removed if it has been rejected by the backend.\n      if (!this.queriesByTarget.has(targetId)) {\n        continue;\n      }\n\n      // Release queries that are still active.\n      await this.localStore\n        .releaseTarget(targetId, /* keepPersistedTargetData */ false)\n        .then(() => {\n          this.remoteStore.unlisten(targetId);\n          this.removeAndCleanupTarget(targetId);\n        })\n        .catch(ignoreIfPrimaryLeaseLoss);\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert } from '../util/assert';\nimport { EventHandler } from '../util/misc';\nimport { ObjectMap } from '../util/obj_map';\nimport { Query } from './query';\nimport { SyncEngine, SyncEngineListener } from './sync_engine';\nimport { OnlineState } from './types';\nimport { ChangeType, DocumentViewChange, ViewSnapshot } from './view_snapshot';\nimport { wrapInUserErrorIfRecoverable } from '../util/async_queue';\n\n/**\n * Holds the listeners and the last received ViewSnapshot for a query being\n * tracked by EventManager.\n */\nclass QueryListenersInfo {\n  viewSnap: ViewSnapshot | undefined = undefined;\n  listeners: QueryListener[] = [];\n}\n\n/**\n * Interface for handling events from the EventManager.\n */\nexport interface Observer<T> {\n  next: EventHandler<T>;\n  error: EventHandler<Error>;\n}\n\n/**\n * EventManager is responsible for mapping queries to query event emitters.\n * It handles \"fan-out\". -- Identical queries will re-use the same watch on the\n * backend.\n */\nexport class EventManager implements SyncEngineListener {\n  private queries = new ObjectMap<Query, QueryListenersInfo>(q =>\n    q.canonicalId()\n  );\n\n  private onlineState = OnlineState.Unknown;\n\n  private snapshotsInSyncListeners: Set<Observer<void>> = new Set();\n\n  constructor(private syncEngine: SyncEngine) {\n    this.syncEngine.subscribe(this);\n  }\n\n  async listen(listener: QueryListener): Promise<void> {\n    const query = listener.query;\n    let firstListen = false;\n\n    let queryInfo = this.queries.get(query);\n    if (!queryInfo) {\n      firstListen = true;\n      queryInfo = new QueryListenersInfo();\n    }\n\n    if (firstListen) {\n      try {\n        queryInfo.viewSnap = await this.syncEngine.listen(query);\n      } catch (e) {\n        const firestoreError = wrapInUserErrorIfRecoverable(\n          e,\n          `Initialization of query '${listener.query}' failed`\n        );\n        listener.onError(firestoreError);\n        return;\n      }\n    }\n\n    this.queries.set(query, queryInfo);\n    queryInfo.listeners.push(listener);\n\n    // Run global snapshot listeners if a consistent snapshot has been emitted.\n    const raisedEvent = listener.applyOnlineStateChange(this.onlineState);\n    debugAssert(\n      !raisedEvent,\n      \"applyOnlineStateChange() shouldn't raise an event for brand-new listeners.\"\n    );\n\n    if (queryInfo.viewSnap) {\n      const raisedEvent = listener.onViewSnapshot(queryInfo.viewSnap);\n      if (raisedEvent) {\n        this.raiseSnapshotsInSyncEvent();\n      }\n    }\n  }\n\n  async unlisten(listener: QueryListener): Promise<void> {\n    const query = listener.query;\n    let lastListen = false;\n\n    const queryInfo = this.queries.get(query);\n    if (queryInfo) {\n      const i = queryInfo.listeners.indexOf(listener);\n      if (i >= 0) {\n        queryInfo.listeners.splice(i, 1);\n        lastListen = queryInfo.listeners.length === 0;\n      }\n    }\n\n    if (lastListen) {\n      this.queries.delete(query);\n      return this.syncEngine.unlisten(query);\n    }\n  }\n\n  onWatchChange(viewSnaps: ViewSnapshot[]): void {\n    let raisedEvent = false;\n    for (const viewSnap of viewSnaps) {\n      const query = viewSnap.query;\n      const queryInfo = this.queries.get(query);\n      if (queryInfo) {\n        for (const listener of queryInfo.listeners) {\n          if (listener.onViewSnapshot(viewSnap)) {\n            raisedEvent = true;\n          }\n        }\n        queryInfo.viewSnap = viewSnap;\n      }\n    }\n    if (raisedEvent) {\n      this.raiseSnapshotsInSyncEvent();\n    }\n  }\n\n  onWatchError(query: Query, error: Error): void {\n    const queryInfo = this.queries.get(query);\n    if (queryInfo) {\n      for (const listener of queryInfo.listeners) {\n        listener.onError(error);\n      }\n    }\n\n    // Remove all listeners. NOTE: We don't need to call syncEngine.unlisten()\n    // after an error.\n    this.queries.delete(query);\n  }\n\n  onOnlineStateChange(onlineState: OnlineState): void {\n    this.onlineState = onlineState;\n    let raisedEvent = false;\n    this.queries.forEach((_, queryInfo) => {\n      for (const listener of queryInfo.listeners) {\n        // Run global snapshot listeners if a consistent snapshot has been emitted.\n        if (listener.applyOnlineStateChange(onlineState)) {\n          raisedEvent = true;\n        }\n      }\n    });\n    if (raisedEvent) {\n      this.raiseSnapshotsInSyncEvent();\n    }\n  }\n\n  addSnapshotsInSyncListener(observer: Observer<void>): void {\n    this.snapshotsInSyncListeners.add(observer);\n    // Immediately fire an initial event, indicating all existing listeners\n    // are in-sync.\n    observer.next();\n  }\n\n  removeSnapshotsInSyncListener(observer: Observer<void>): void {\n    this.snapshotsInSyncListeners.delete(observer);\n  }\n\n  // Call all global snapshot listeners that have been set.\n  private raiseSnapshotsInSyncEvent(): void {\n    this.snapshotsInSyncListeners.forEach(observer => {\n      observer.next();\n    });\n  }\n}\n\nexport interface ListenOptions {\n  /** Raise events even when only the metadata changes */\n  readonly includeMetadataChanges?: boolean;\n\n  /**\n   * Wait for a sync with the server when online, but still raise events while\n   * offline.\n   */\n  readonly waitForSyncWhenOnline?: boolean;\n}\n\n/**\n * QueryListener takes a series of internal view snapshots and determines\n * when to raise the event.\n *\n * It uses an Observer to dispatch events.\n */\nexport class QueryListener {\n  /**\n   * Initial snapshots (e.g. from cache) may not be propagated to the wrapped\n   * observer. This flag is set to true once we've actually raised an event.\n   */\n  private raisedInitialEvent = false;\n\n  private options: ListenOptions;\n\n  private snap: ViewSnapshot | null = null;\n\n  private onlineState = OnlineState.Unknown;\n\n  constructor(\n    readonly query: Query,\n    private queryObserver: Observer<ViewSnapshot>,\n    options?: ListenOptions\n  ) {\n    this.options = options || {};\n  }\n\n  /**\n   * Applies the new ViewSnapshot to this listener, raising a user-facing event\n   * if applicable (depending on what changed, whether the user has opted into\n   * metadata-only changes, etc.). Returns true if a user-facing event was\n   * indeed raised.\n   */\n  onViewSnapshot(snap: ViewSnapshot): boolean {\n    debugAssert(\n      snap.docChanges.length > 0 || snap.syncStateChanged,\n      'We got a new snapshot with no changes?'\n    );\n\n    if (!this.options.includeMetadataChanges) {\n      // Remove the metadata only changes.\n      const docChanges: DocumentViewChange[] = [];\n      for (const docChange of snap.docChanges) {\n        if (docChange.type !== ChangeType.Metadata) {\n          docChanges.push(docChange);\n        }\n      }\n      snap = new ViewSnapshot(\n        snap.query,\n        snap.docs,\n        snap.oldDocs,\n        docChanges,\n        snap.mutatedKeys,\n        snap.fromCache,\n        snap.syncStateChanged,\n        /* excludesMetadataChanges= */ true\n      );\n    }\n    let raisedEvent = false;\n    if (!this.raisedInitialEvent) {\n      if (this.shouldRaiseInitialEvent(snap, this.onlineState)) {\n        this.raiseInitialEvent(snap);\n        raisedEvent = true;\n      }\n    } else if (this.shouldRaiseEvent(snap)) {\n      this.queryObserver.next(snap);\n      raisedEvent = true;\n    }\n\n    this.snap = snap;\n    return raisedEvent;\n  }\n\n  onError(error: Error): void {\n    this.queryObserver.error(error);\n  }\n\n  /** Returns whether a snapshot was raised. */\n  applyOnlineStateChange(onlineState: OnlineState): boolean {\n    this.onlineState = onlineState;\n    let raisedEvent = false;\n    if (\n      this.snap &&\n      !this.raisedInitialEvent &&\n      this.shouldRaiseInitialEvent(this.snap, onlineState)\n    ) {\n      this.raiseInitialEvent(this.snap);\n      raisedEvent = true;\n    }\n    return raisedEvent;\n  }\n\n  private shouldRaiseInitialEvent(\n    snap: ViewSnapshot,\n    onlineState: OnlineState\n  ): boolean {\n    debugAssert(\n      !this.raisedInitialEvent,\n      'Determining whether to raise first event but already had first event'\n    );\n\n    // Always raise the first event when we're synced\n    if (!snap.fromCache) {\n      return true;\n    }\n\n    // NOTE: We consider OnlineState.Unknown as online (it should become Offline\n    // or Online if we wait long enough).\n    const maybeOnline = onlineState !== OnlineState.Offline;\n    // Don't raise the event if we're online, aren't synced yet (checked\n    // above) and are waiting for a sync.\n    if (this.options.waitForSyncWhenOnline && maybeOnline) {\n      debugAssert(\n        snap.fromCache,\n        'Waiting for sync, but snapshot is not from cache'\n      );\n      return false;\n    }\n\n    // Raise data from cache if we have any documents or we are offline\n    return !snap.docs.isEmpty() || onlineState === OnlineState.Offline;\n  }\n\n  private shouldRaiseEvent(snap: ViewSnapshot): boolean {\n    // We don't need to handle includeDocumentMetadataChanges here because\n    // the Metadata only changes have already been stripped out if needed.\n    // At this point the only changes we will see are the ones we should\n    // propagate.\n    if (snap.docChanges.length > 0) {\n      return true;\n    }\n\n    const hasPendingWritesChanged =\n      this.snap && this.snap.hasPendingWrites !== snap.hasPendingWrites;\n    if (snap.syncStateChanged || hasPendingWritesChanged) {\n      return this.options.includeMetadataChanges === true;\n    }\n\n    // Generally we should have hit one of the cases above, but it's possible\n    // to get here if there were only metadata docChanges and they got\n    // stripped out.\n    return false;\n  }\n\n  private raiseInitialEvent(snap: ViewSnapshot): void {\n    debugAssert(\n      !this.raisedInitialEvent,\n      'Trying to raise initial events for second time'\n    );\n    snap = ViewSnapshot.fromInitialDocuments(\n      snap.query,\n      snap.docs,\n      snap.mutatedKeys,\n      snap.fromCache\n    );\n    this.raisedInitialEvent = true;\n    this.queryObserver.next(snap);\n  }\n}\n","/**\n * @license\n * Copyright 2018 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { User } from '../auth/user';\nimport { ListenSequence } from '../core/listen_sequence';\nimport {\n  BatchId,\n  ListenSequenceNumber,\n  MutationBatchState,\n  OnlineState,\n  TargetId\n} from '../core/types';\nimport { TargetIdSet, targetIdSet } from '../model/collections';\nimport { Platform } from '../platform/platform';\nimport { hardAssert, debugAssert } from '../util/assert';\nimport { AsyncQueue } from '../util/async_queue';\nimport { Code, FirestoreError } from '../util/error';\nimport { logError, logDebug } from '../util/log';\nimport { SortedSet } from '../util/sorted_set';\nimport { SortedMap } from '../util/sorted_map';\nimport { primitiveComparator } from '../util/misc';\nimport { isSafeInteger } from '../util/types';\nimport {\n  QueryTargetState,\n  SharedClientStateSyncer\n} from './shared_client_state_syncer';\nimport {\n  CLIENT_STATE_KEY_PREFIX,\n  ClientStateSchema,\n  createWebStorageClientStateKey,\n  createWebStorageMutationBatchKey,\n  createWebStorageOnlineStateKey,\n  createWebStorageQueryTargetMetadataKey,\n  createWebStorageSequenceNumberKey,\n  MUTATION_BATCH_KEY_PREFIX,\n  MutationMetadataSchema,\n  QUERY_TARGET_KEY_PREFIX,\n  QueryTargetStateSchema,\n  SharedOnlineStateSchema\n} from './shared_client_state_schema';\n\nconst LOG_TAG = 'SharedClientState';\n\n/**\n * A randomly-generated key assigned to each Firestore instance at startup.\n */\nexport type ClientId = string;\n\n/**\n * A `SharedClientState` keeps track of the global state of the mutations\n * and query targets for all active clients with the same persistence key (i.e.\n * project ID and FirebaseApp name). It relays local changes to other clients\n * and updates its local state as new state is observed.\n *\n * `SharedClientState` is primarily used for synchronization in Multi-Tab\n * environments. Each tab is responsible for registering its active query\n * targets and mutations. `SharedClientState` will then notify the listener\n * assigned to `.syncEngine` for updates to mutations and queries that\n * originated in other clients.\n *\n * To receive notifications, `.syncEngine` and `.onlineStateHandler` has to be\n * assigned before calling `start()`.\n */\nexport interface SharedClientState {\n  syncEngine: SharedClientStateSyncer | null;\n  onlineStateHandler: ((onlineState: OnlineState) => void) | null;\n  sequenceNumberHandler:\n    | ((sequenceNumber: ListenSequenceNumber) => void)\n    | null;\n\n  /** Registers the Mutation Batch ID of a newly pending mutation. */\n  addPendingMutation(batchId: BatchId): void;\n\n  /**\n   * Records that a pending mutation has been acknowledged or rejected.\n   * Called by the primary client to notify secondary clients of mutation\n   * results as they come back from the backend.\n   */\n  updateMutationState(\n    batchId: BatchId,\n    state: 'acknowledged' | 'rejected',\n    error?: FirestoreError\n  ): void;\n\n  /**\n   * Associates a new Query Target ID with the local Firestore client. Returns\n   * the new query state for the query (which can be 'current' if the query is\n   * already associated with another tab).\n   *\n   * If the target id is already associated with local client, the method simply\n   * returns its `QueryTargetState`.\n   */\n  addLocalQueryTarget(targetId: TargetId): QueryTargetState;\n\n  /** Removes the Query Target ID association from the local client. */\n  removeLocalQueryTarget(targetId: TargetId): void;\n\n  /** Checks whether the target is associated with the local client. */\n  isLocalQueryTarget(targetId: TargetId): boolean;\n\n  /**\n   * Processes an update to a query target.\n   *\n   * Called by the primary client to notify secondary clients of document\n   * changes or state transitions that affect the provided query target.\n   */\n  updateQueryState(\n    targetId: TargetId,\n    state: QueryTargetState,\n    error?: FirestoreError\n  ): void;\n\n  /**\n   * Removes the target's metadata entry.\n   *\n   * Called by the primary client when all clients stopped listening to a query\n   * target.\n   */\n  clearQueryState(targetId: TargetId): void;\n\n  /**\n   * Gets the active Query Targets IDs for all active clients.\n   *\n   * The implementation for this may require O(n) runtime, where 'n' is the size\n   * of the result set.\n   */\n  // Visible for testing\n  getAllActiveQueryTargets(): SortedSet<TargetId>;\n\n  /**\n   * Checks whether the provided target ID is currently being listened to by\n   * any of the active clients.\n   *\n   * The implementation may require O(n*log m) runtime, where 'n' is the number\n   * of clients and 'm' the number of targets.\n   */\n  isActiveQueryTarget(targetId: TargetId): boolean;\n\n  /**\n   * Starts the SharedClientState, reads existing client data and registers\n   * listeners for updates to new and existing clients.\n   */\n  start(): Promise<void>;\n\n  /** Shuts down the `SharedClientState` and its listeners. */\n  shutdown(): void;\n\n  /**\n   * Changes the active user and removes all existing user-specific data. The\n   * user change does not call back into SyncEngine (for example, no mutations\n   * will be marked as removed).\n   */\n  handleUserChange(\n    user: User,\n    removedBatchIds: BatchId[],\n    addedBatchIds: BatchId[]\n  ): void;\n\n  /** Changes the shared online state of all clients. */\n  setOnlineState(onlineState: OnlineState): void;\n\n  writeSequenceNumber(sequenceNumber: ListenSequenceNumber): void;\n}\n\n/**\n * Holds the state of a mutation batch, including its user ID, batch ID and\n * whether the batch is 'pending', 'acknowledged' or 'rejected'.\n */\n// Visible for testing\nexport class MutationMetadata {\n  constructor(\n    readonly user: User,\n    readonly batchId: BatchId,\n    readonly state: MutationBatchState,\n    readonly error?: FirestoreError\n  ) {\n    debugAssert(\n      (error !== undefined) === (state === 'rejected'),\n      `MutationMetadata must contain an error iff state is 'rejected'`\n    );\n  }\n\n  /**\n   * Parses a MutationMetadata from its JSON representation in WebStorage.\n   * Logs a warning and returns null if the format of the data is not valid.\n   */\n  static fromWebStorageEntry(\n    user: User,\n    batchId: BatchId,\n    value: string\n  ): MutationMetadata | null {\n    const mutationBatch = JSON.parse(value) as MutationMetadataSchema;\n\n    let validData =\n      typeof mutationBatch === 'object' &&\n      ['pending', 'acknowledged', 'rejected'].indexOf(mutationBatch.state) !==\n        -1 &&\n      (mutationBatch.error === undefined ||\n        typeof mutationBatch.error === 'object');\n\n    let firestoreError: FirestoreError | undefined = undefined;\n\n    if (validData && mutationBatch.error) {\n      validData =\n        typeof mutationBatch.error.message === 'string' &&\n        typeof mutationBatch.error.code === 'string';\n      if (validData) {\n        firestoreError = new FirestoreError(\n          mutationBatch.error.code as Code,\n          mutationBatch.error.message\n        );\n      }\n    }\n\n    if (validData) {\n      return new MutationMetadata(\n        user,\n        batchId,\n        mutationBatch.state,\n        firestoreError\n      );\n    } else {\n      logError(\n        LOG_TAG,\n        `Failed to parse mutation state for ID '${batchId}': ${value}`\n      );\n      return null;\n    }\n  }\n\n  toWebStorageJSON(): string {\n    const batchMetadata: MutationMetadataSchema = {\n      state: this.state,\n      updateTimeMs: Date.now() // Modify the existing value to trigger update.\n    };\n\n    if (this.error) {\n      batchMetadata.error = {\n        code: this.error.code,\n        message: this.error.message\n      };\n    }\n\n    return JSON.stringify(batchMetadata);\n  }\n}\n\n/**\n * Holds the state of a query target, including its target ID and whether the\n * target is 'not-current', 'current' or 'rejected'.\n */\n// Visible for testing\nexport class QueryTargetMetadata {\n  constructor(\n    readonly targetId: TargetId,\n    readonly state: QueryTargetState,\n    readonly error?: FirestoreError\n  ) {\n    debugAssert(\n      (error !== undefined) === (state === 'rejected'),\n      `QueryTargetMetadata must contain an error iff state is 'rejected'`\n    );\n  }\n\n  /**\n   * Parses a QueryTargetMetadata from its JSON representation in WebStorage.\n   * Logs a warning and returns null if the format of the data is not valid.\n   */\n  static fromWebStorageEntry(\n    targetId: TargetId,\n    value: string\n  ): QueryTargetMetadata | null {\n    const targetState = JSON.parse(value) as QueryTargetStateSchema;\n\n    let validData =\n      typeof targetState === 'object' &&\n      ['not-current', 'current', 'rejected'].indexOf(targetState.state) !==\n        -1 &&\n      (targetState.error === undefined ||\n        typeof targetState.error === 'object');\n\n    let firestoreError: FirestoreError | undefined = undefined;\n\n    if (validData && targetState.error) {\n      validData =\n        typeof targetState.error.message === 'string' &&\n        typeof targetState.error.code === 'string';\n      if (validData) {\n        firestoreError = new FirestoreError(\n          targetState.error.code as Code,\n          targetState.error.message\n        );\n      }\n    }\n\n    if (validData) {\n      return new QueryTargetMetadata(\n        targetId,\n        targetState.state,\n        firestoreError\n      );\n    } else {\n      logError(\n        LOG_TAG,\n        `Failed to parse target state for ID '${targetId}': ${value}`\n      );\n      return null;\n    }\n  }\n\n  toWebStorageJSON(): string {\n    const targetState: QueryTargetStateSchema = {\n      state: this.state,\n      updateTimeMs: Date.now() // Modify the existing value to trigger update.\n    };\n\n    if (this.error) {\n      targetState.error = {\n        code: this.error.code,\n        message: this.error.message\n      };\n    }\n\n    return JSON.stringify(targetState);\n  }\n}\n\n/**\n * Metadata state of a single client denoting the query targets it is actively\n * listening to.\n */\n// Visible for testing.\nexport interface ClientState {\n  readonly activeTargetIds: TargetIdSet;\n}\n\n/**\n * This class represents the immutable ClientState for a client read from\n * WebStorage, containing the list of active query targets.\n */\nclass RemoteClientState implements ClientState {\n  private constructor(\n    readonly clientId: ClientId,\n    readonly activeTargetIds: TargetIdSet\n  ) {}\n\n  /**\n   * Parses a RemoteClientState from the JSON representation in WebStorage.\n   * Logs a warning and returns null if the format of the data is not valid.\n   */\n  static fromWebStorageEntry(\n    clientId: ClientId,\n    value: string\n  ): RemoteClientState | null {\n    const clientState = JSON.parse(value) as ClientStateSchema;\n\n    let validData =\n      typeof clientState === 'object' &&\n      clientState.activeTargetIds instanceof Array;\n\n    let activeTargetIdsSet = targetIdSet();\n\n    for (let i = 0; validData && i < clientState.activeTargetIds.length; ++i) {\n      validData = isSafeInteger(clientState.activeTargetIds[i]);\n      activeTargetIdsSet = activeTargetIdsSet.add(\n        clientState.activeTargetIds[i]\n      );\n    }\n\n    if (validData) {\n      return new RemoteClientState(clientId, activeTargetIdsSet);\n    } else {\n      logError(\n        LOG_TAG,\n        `Failed to parse client data for instance '${clientId}': ${value}`\n      );\n      return null;\n    }\n  }\n}\n\n/**\n * This class represents the online state for all clients participating in\n * multi-tab. The online state is only written to by the primary client, and\n * used in secondary clients to update their query views.\n */\nexport class SharedOnlineState {\n  constructor(readonly clientId: string, readonly onlineState: OnlineState) {}\n\n  /**\n   * Parses a SharedOnlineState from its JSON representation in WebStorage.\n   * Logs a warning and returns null if the format of the data is not valid.\n   */\n  static fromWebStorageEntry(value: string): SharedOnlineState | null {\n    const onlineState = JSON.parse(value) as SharedOnlineStateSchema;\n\n    const validData =\n      typeof onlineState === 'object' &&\n      ['Unknown', 'Online', 'Offline'].indexOf(onlineState.onlineState) !==\n        -1 &&\n      typeof onlineState.clientId === 'string';\n\n    if (validData) {\n      return new SharedOnlineState(\n        onlineState.clientId,\n        onlineState.onlineState as OnlineState\n      );\n    } else {\n      logError(LOG_TAG, `Failed to parse online state: ${value}`);\n      return null;\n    }\n  }\n}\n\n/**\n * Metadata state of the local client. Unlike `RemoteClientState`, this class is\n * mutable and keeps track of all pending mutations, which allows us to\n * update the range of pending mutation batch IDs as new mutations are added or\n * removed.\n *\n * The data in `LocalClientState` is not read from WebStorage and instead\n * updated via its instance methods. The updated state can be serialized via\n * `toWebStorageJSON()`.\n */\n// Visible for testing.\nexport class LocalClientState implements ClientState {\n  activeTargetIds = targetIdSet();\n\n  addQueryTarget(targetId: TargetId): void {\n    this.activeTargetIds = this.activeTargetIds.add(targetId);\n  }\n\n  removeQueryTarget(targetId: TargetId): void {\n    this.activeTargetIds = this.activeTargetIds.delete(targetId);\n  }\n\n  /**\n   * Converts this entry into a JSON-encoded format we can use for WebStorage.\n   * Does not encode `clientId` as it is part of the key in WebStorage.\n   */\n  toWebStorageJSON(): string {\n    const data: ClientStateSchema = {\n      activeTargetIds: this.activeTargetIds.toArray(),\n      updateTimeMs: Date.now() // Modify the existing value to trigger update.\n    };\n    return JSON.stringify(data);\n  }\n}\n\n/**\n * `WebStorageSharedClientState` uses WebStorage (window.localStorage) as the\n * backing store for the SharedClientState. It keeps track of all active\n * clients and supports modifications of the local client's data.\n */\nexport class WebStorageSharedClientState implements SharedClientState {\n  syncEngine: SharedClientStateSyncer | null = null;\n  onlineStateHandler: ((onlineState: OnlineState) => void) | null = null;\n  sequenceNumberHandler:\n    | ((sequenceNumber: ListenSequenceNumber) => void)\n    | null = null;\n\n  private readonly storage: Storage;\n  private readonly localClientStorageKey: string;\n  private readonly sequenceNumberKey: string;\n  private readonly storageListener = this.handleWebStorageEvent.bind(this);\n  private readonly onlineStateKey: string;\n  private readonly clientStateKeyRe: RegExp;\n  private readonly mutationBatchKeyRe: RegExp;\n  private readonly queryTargetKeyRe: RegExp;\n  private activeClients = new SortedMap<string, ClientState>(\n    primitiveComparator\n  );\n  private started = false;\n  private currentUser: User;\n\n  /**\n   * Captures WebStorage events that occur before `start()` is called. These\n   * events are replayed once `WebStorageSharedClientState` is started.\n   */\n  private earlyEvents: StorageEvent[] = [];\n\n  constructor(\n    private readonly queue: AsyncQueue,\n    private readonly platform: Platform,\n    private readonly persistenceKey: string,\n    private readonly localClientId: ClientId,\n    initialUser: User\n  ) {\n    if (!WebStorageSharedClientState.isAvailable(this.platform)) {\n      throw new FirestoreError(\n        Code.UNIMPLEMENTED,\n        'LocalStorage is not available on this platform.'\n      );\n    }\n    // Escape the special characters mentioned here:\n    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions\n    const escapedPersistenceKey = persistenceKey.replace(\n      /[.*+?^${}()|[\\]\\\\]/g,\n      '\\\\$&'\n    );\n\n    this.storage = this.platform.window!.localStorage;\n    this.currentUser = initialUser;\n    this.localClientStorageKey = createWebStorageClientStateKey(\n      this.persistenceKey,\n      this.localClientId\n    );\n    this.sequenceNumberKey = createWebStorageSequenceNumberKey(\n      this.persistenceKey\n    );\n    this.activeClients = this.activeClients.insert(\n      this.localClientId,\n      new LocalClientState()\n    );\n\n    this.clientStateKeyRe = new RegExp(\n      `^${CLIENT_STATE_KEY_PREFIX}_${escapedPersistenceKey}_([^_]*)$`\n    );\n    this.mutationBatchKeyRe = new RegExp(\n      `^${MUTATION_BATCH_KEY_PREFIX}_${escapedPersistenceKey}_(\\\\d+)(?:_(.*))?$`\n    );\n    this.queryTargetKeyRe = new RegExp(\n      `^${QUERY_TARGET_KEY_PREFIX}_${escapedPersistenceKey}_(\\\\d+)$`\n    );\n\n    this.onlineStateKey = createWebStorageOnlineStateKey(this.persistenceKey);\n\n    // Rather than adding the storage observer during start(), we add the\n    // storage observer during initialization. This ensures that we collect\n    // events before other components populate their initial state (during their\n    // respective start() calls). Otherwise, we might for example miss a\n    // mutation that is added after LocalStore's start() processed the existing\n    // mutations but before we observe WebStorage events.\n    this.platform.window!.addEventListener('storage', this.storageListener);\n  }\n\n  /** Returns 'true' if WebStorage is available in the current environment. */\n  static isAvailable(platform: Platform): boolean {\n    return !!(platform.window && platform.window.localStorage != null);\n  }\n\n  async start(): Promise<void> {\n    debugAssert(!this.started, 'WebStorageSharedClientState already started');\n    debugAssert(\n      this.syncEngine !== null,\n      'syncEngine property must be set before calling start()'\n    );\n    debugAssert(\n      this.onlineStateHandler !== null,\n      'onlineStateHandler property must be set before calling start()'\n    );\n\n    // Retrieve the list of existing clients to backfill the data in\n    // SharedClientState.\n    const existingClients = await this.syncEngine!.getActiveClients();\n\n    for (const clientId of existingClients) {\n      if (clientId === this.localClientId) {\n        continue;\n      }\n\n      const storageItem = this.getItem(\n        createWebStorageClientStateKey(this.persistenceKey, clientId)\n      );\n      if (storageItem) {\n        const clientState = RemoteClientState.fromWebStorageEntry(\n          clientId,\n          storageItem\n        );\n        if (clientState) {\n          this.activeClients = this.activeClients.insert(\n            clientState.clientId,\n            clientState\n          );\n        }\n      }\n    }\n\n    this.persistClientState();\n\n    // Check if there is an existing online state and call the callback handler\n    // if applicable.\n    const onlineStateJSON = this.storage.getItem(this.onlineStateKey);\n    if (onlineStateJSON) {\n      const onlineState = this.fromWebStorageOnlineState(onlineStateJSON);\n      if (onlineState) {\n        this.handleOnlineStateEvent(onlineState);\n      }\n    }\n\n    for (const event of this.earlyEvents) {\n      this.handleWebStorageEvent(event);\n    }\n\n    this.earlyEvents = [];\n\n    // Register a window unload hook to remove the client metadata entry from\n    // WebStorage even if `shutdown()` was not called.\n    this.platform.window!.addEventListener('unload', () => this.shutdown());\n\n    this.started = true;\n  }\n\n  writeSequenceNumber(sequenceNumber: ListenSequenceNumber): void {\n    this.setItem(this.sequenceNumberKey, JSON.stringify(sequenceNumber));\n  }\n\n  getAllActiveQueryTargets(): TargetIdSet {\n    return this.extractActiveQueryTargets(this.activeClients);\n  }\n\n  isActiveQueryTarget(targetId: TargetId): boolean {\n    let found = false;\n    this.activeClients.forEach((key, value) => {\n      if (value.activeTargetIds.has(targetId)) {\n        found = true;\n      }\n    });\n    return found;\n  }\n\n  addPendingMutation(batchId: BatchId): void {\n    this.persistMutationState(batchId, 'pending');\n  }\n\n  updateMutationState(\n    batchId: BatchId,\n    state: 'acknowledged' | 'rejected',\n    error?: FirestoreError\n  ): void {\n    this.persistMutationState(batchId, state, error);\n\n    // Once a final mutation result is observed by other clients, they no longer\n    // access the mutation's metadata entry. Since WebStorage replays events\n    // in order, it is safe to delete the entry right after updating it.\n    this.removeMutationState(batchId);\n  }\n\n  addLocalQueryTarget(targetId: TargetId): QueryTargetState {\n    let queryState: QueryTargetState = 'not-current';\n\n    // Lookup an existing query state if the target ID was already registered\n    // by another tab\n    if (this.isActiveQueryTarget(targetId)) {\n      const storageItem = this.storage.getItem(\n        createWebStorageQueryTargetMetadataKey(this.persistenceKey, targetId)\n      );\n\n      if (storageItem) {\n        const metadata = QueryTargetMetadata.fromWebStorageEntry(\n          targetId,\n          storageItem\n        );\n        if (metadata) {\n          queryState = metadata.state;\n        }\n      }\n    }\n\n    this.localClientState.addQueryTarget(targetId);\n    this.persistClientState();\n\n    return queryState;\n  }\n\n  removeLocalQueryTarget(targetId: TargetId): void {\n    this.localClientState.removeQueryTarget(targetId);\n    this.persistClientState();\n  }\n\n  isLocalQueryTarget(targetId: TargetId): boolean {\n    return this.localClientState.activeTargetIds.has(targetId);\n  }\n\n  clearQueryState(targetId: TargetId): void {\n    this.removeItem(\n      createWebStorageQueryTargetMetadataKey(this.persistenceKey, targetId)\n    );\n  }\n\n  updateQueryState(\n    targetId: TargetId,\n    state: QueryTargetState,\n    error?: FirestoreError\n  ): void {\n    this.persistQueryTargetState(targetId, state, error);\n  }\n\n  handleUserChange(\n    user: User,\n    removedBatchIds: BatchId[],\n    addedBatchIds: BatchId[]\n  ): void {\n    removedBatchIds.forEach(batchId => {\n      this.removeMutationState(batchId);\n    });\n    this.currentUser = user;\n    addedBatchIds.forEach(batchId => {\n      this.addPendingMutation(batchId);\n    });\n  }\n\n  setOnlineState(onlineState: OnlineState): void {\n    this.persistOnlineState(onlineState);\n  }\n\n  shutdown(): void {\n    if (this.started) {\n      this.platform.window!.removeEventListener(\n        'storage',\n        this.storageListener\n      );\n      this.removeItem(this.localClientStorageKey);\n      this.started = false;\n    }\n  }\n\n  private getItem(key: string): string | null {\n    const value = this.storage.getItem(key);\n    logDebug(LOG_TAG, 'READ', key, value);\n    return value;\n  }\n\n  private setItem(key: string, value: string): void {\n    logDebug(LOG_TAG, 'SET', key, value);\n    this.storage.setItem(key, value);\n  }\n\n  private removeItem(key: string): void {\n    logDebug(LOG_TAG, 'REMOVE', key);\n    this.storage.removeItem(key);\n  }\n\n  private handleWebStorageEvent(event: StorageEvent): void {\n    if (event.storageArea === this.storage) {\n      logDebug(LOG_TAG, 'EVENT', event.key, event.newValue);\n\n      if (event.key === this.localClientStorageKey) {\n        logError(\n          'Received WebStorage notification for local change. Another client might have ' +\n            'garbage-collected our state'\n        );\n        return;\n      }\n\n      this.queue.enqueueRetryable(async () => {\n        if (!this.started) {\n          this.earlyEvents.push(event);\n          return;\n        }\n\n        if (event.key === null) {\n          return;\n        }\n\n        if (this.clientStateKeyRe.test(event.key)) {\n          if (event.newValue != null) {\n            const clientState = this.fromWebStorageClientState(\n              event.key,\n              event.newValue\n            );\n            if (clientState) {\n              return this.handleClientStateEvent(\n                clientState.clientId,\n                clientState\n              );\n            }\n          } else {\n            const clientId = this.fromWebStorageClientStateKey(event.key)!;\n            return this.handleClientStateEvent(clientId, null);\n          }\n        } else if (this.mutationBatchKeyRe.test(event.key)) {\n          if (event.newValue !== null) {\n            const mutationMetadata = this.fromWebStorageMutationMetadata(\n              event.key,\n              event.newValue\n            );\n            if (mutationMetadata) {\n              return this.handleMutationBatchEvent(mutationMetadata);\n            }\n          }\n        } else if (this.queryTargetKeyRe.test(event.key)) {\n          if (event.newValue !== null) {\n            const queryTargetMetadata = this.fromWebStorageQueryTargetMetadata(\n              event.key,\n              event.newValue\n            );\n            if (queryTargetMetadata) {\n              return this.handleQueryTargetEvent(queryTargetMetadata);\n            }\n          }\n        } else if (event.key === this.onlineStateKey) {\n          if (event.newValue !== null) {\n            const onlineState = this.fromWebStorageOnlineState(event.newValue);\n            if (onlineState) {\n              return this.handleOnlineStateEvent(onlineState);\n            }\n          }\n        } else if (event.key === this.sequenceNumberKey) {\n          debugAssert(\n            !!this.sequenceNumberHandler,\n            'Missing sequenceNumberHandler'\n          );\n          const sequenceNumber = fromWebStorageSequenceNumber(event.newValue);\n          if (sequenceNumber !== ListenSequence.INVALID) {\n            this.sequenceNumberHandler!(sequenceNumber);\n          }\n        }\n      });\n    }\n  }\n\n  private get localClientState(): LocalClientState {\n    return this.activeClients.get(this.localClientId) as LocalClientState;\n  }\n\n  private persistClientState(): void {\n    this.setItem(\n      this.localClientStorageKey,\n      this.localClientState.toWebStorageJSON()\n    );\n  }\n\n  private persistMutationState(\n    batchId: BatchId,\n    state: MutationBatchState,\n    error?: FirestoreError\n  ): void {\n    const mutationState = new MutationMetadata(\n      this.currentUser,\n      batchId,\n      state,\n      error\n    );\n    const mutationKey = createWebStorageMutationBatchKey(\n      this.persistenceKey,\n      this.currentUser,\n      batchId\n    );\n    this.setItem(mutationKey, mutationState.toWebStorageJSON());\n  }\n\n  private removeMutationState(batchId: BatchId): void {\n    const mutationKey = createWebStorageMutationBatchKey(\n      this.persistenceKey,\n      this.currentUser,\n      batchId\n    );\n    this.removeItem(mutationKey);\n  }\n\n  private persistOnlineState(onlineState: OnlineState): void {\n    const entry: SharedOnlineStateSchema = {\n      clientId: this.localClientId,\n      onlineState\n    };\n    this.storage.setItem(this.onlineStateKey, JSON.stringify(entry));\n  }\n\n  private persistQueryTargetState(\n    targetId: TargetId,\n    state: QueryTargetState,\n    error?: FirestoreError\n  ): void {\n    const targetKey = createWebStorageQueryTargetMetadataKey(\n      this.persistenceKey,\n      targetId\n    );\n    const targetMetadata = new QueryTargetMetadata(targetId, state, error);\n    this.setItem(targetKey, targetMetadata.toWebStorageJSON());\n  }\n\n  /**\n   * Parses a client state key in WebStorage. Returns null if the key does not\n   * match the expected key format.\n   */\n  private fromWebStorageClientStateKey(key: string): ClientId | null {\n    const match = this.clientStateKeyRe.exec(key);\n    return match ? match[1] : null;\n  }\n\n  /**\n   * Parses a client state in WebStorage. Returns 'null' if the value could not\n   * be parsed.\n   */\n  private fromWebStorageClientState(\n    key: string,\n    value: string\n  ): RemoteClientState | null {\n    const clientId = this.fromWebStorageClientStateKey(key);\n    debugAssert(clientId !== null, `Cannot parse client state key '${key}'`);\n    return RemoteClientState.fromWebStorageEntry(clientId, value);\n  }\n\n  /**\n   * Parses a mutation batch state in WebStorage. Returns 'null' if the value\n   * could not be parsed.\n   */\n  private fromWebStorageMutationMetadata(\n    key: string,\n    value: string\n  ): MutationMetadata | null {\n    const match = this.mutationBatchKeyRe.exec(key);\n    debugAssert(match !== null, `Cannot parse mutation batch key '${key}'`);\n\n    const batchId = Number(match[1]);\n    const userId = match[2] !== undefined ? match[2] : null;\n    return MutationMetadata.fromWebStorageEntry(\n      new User(userId),\n      batchId,\n      value\n    );\n  }\n\n  /**\n   * Parses a query target state from WebStorage. Returns 'null' if the value\n   * could not be parsed.\n   */\n  private fromWebStorageQueryTargetMetadata(\n    key: string,\n    value: string\n  ): QueryTargetMetadata | null {\n    const match = this.queryTargetKeyRe.exec(key);\n    debugAssert(match !== null, `Cannot parse query target key '${key}'`);\n\n    const targetId = Number(match[1]);\n    return QueryTargetMetadata.fromWebStorageEntry(targetId, value);\n  }\n\n  /**\n   * Parses an online state from WebStorage. Returns 'null' if the value\n   * could not be parsed.\n   */\n  private fromWebStorageOnlineState(value: string): SharedOnlineState | null {\n    return SharedOnlineState.fromWebStorageEntry(value);\n  }\n\n  private async handleMutationBatchEvent(\n    mutationBatch: MutationMetadata\n  ): Promise<void> {\n    if (mutationBatch.user.uid !== this.currentUser.uid) {\n      logDebug(\n        LOG_TAG,\n        `Ignoring mutation for non-active user ${mutationBatch.user.uid}`\n      );\n      return;\n    }\n\n    return this.syncEngine!.applyBatchState(\n      mutationBatch.batchId,\n      mutationBatch.state,\n      mutationBatch.error\n    );\n  }\n\n  private handleQueryTargetEvent(\n    targetMetadata: QueryTargetMetadata\n  ): Promise<void> {\n    return this.syncEngine!.applyTargetState(\n      targetMetadata.targetId,\n      targetMetadata.state,\n      targetMetadata.error\n    );\n  }\n\n  private handleClientStateEvent(\n    clientId: ClientId,\n    clientState: RemoteClientState | null\n  ): Promise<void> {\n    const updatedClients = clientState\n      ? this.activeClients.insert(clientId, clientState)\n      : this.activeClients.remove(clientId);\n\n    const existingTargets = this.extractActiveQueryTargets(this.activeClients);\n    const newTargets = this.extractActiveQueryTargets(updatedClients);\n\n    const addedTargets: TargetId[] = [];\n    const removedTargets: TargetId[] = [];\n\n    newTargets.forEach(targetId => {\n      if (!existingTargets.has(targetId)) {\n        addedTargets.push(targetId);\n      }\n    });\n\n    existingTargets.forEach(targetId => {\n      if (!newTargets.has(targetId)) {\n        removedTargets.push(targetId);\n      }\n    });\n\n    return this.syncEngine!.applyActiveTargetsChange(\n      addedTargets,\n      removedTargets\n    ).then(() => {\n      this.activeClients = updatedClients;\n    });\n  }\n\n  private handleOnlineStateEvent(onlineState: SharedOnlineState): void {\n    // We check whether the client that wrote this online state is still active\n    // by comparing its client ID to the list of clients kept active in\n    // IndexedDb. If a client does not update their IndexedDb client state\n    // within 5 seconds, it is considered inactive and we don't emit an online\n    // state event.\n    if (this.activeClients.get(onlineState.clientId)) {\n      this.onlineStateHandler!(onlineState.onlineState);\n    }\n  }\n\n  private extractActiveQueryTargets(\n    clients: SortedMap<string, ClientState>\n  ): SortedSet<TargetId> {\n    let activeTargets = targetIdSet();\n    clients.forEach((kev, value) => {\n      activeTargets = activeTargets.unionWith(value.activeTargetIds);\n    });\n    return activeTargets;\n  }\n}\n\nfunction fromWebStorageSequenceNumber(\n  seqString: string | null\n): ListenSequenceNumber {\n  let sequenceNumber = ListenSequence.INVALID;\n  if (seqString != null) {\n    try {\n      const parsed = JSON.parse(seqString);\n      hardAssert(\n        typeof parsed === 'number',\n        'Found non-numeric sequence number'\n      );\n      sequenceNumber = parsed;\n    } catch (e) {\n      logError(LOG_TAG, 'Failed to read sequence number from WebStorage', e);\n    }\n  }\n  return sequenceNumber;\n}\n\n/**\n * `MemorySharedClientState` is a simple implementation of SharedClientState for\n * clients using memory persistence. The state in this class remains fully\n * isolated and no synchronization is performed.\n */\nexport class MemorySharedClientState implements SharedClientState {\n  private localState = new LocalClientState();\n  private queryState: { [targetId: number]: QueryTargetState } = {};\n\n  syncEngine: SharedClientStateSyncer | null = null;\n  onlineStateHandler: ((onlineState: OnlineState) => void) | null = null;\n  sequenceNumberHandler:\n    | ((sequenceNumber: ListenSequenceNumber) => void)\n    | null = null;\n\n  addPendingMutation(batchId: BatchId): void {\n    // No op.\n  }\n\n  updateMutationState(\n    batchId: BatchId,\n    state: 'acknowledged' | 'rejected',\n    error?: FirestoreError\n  ): void {\n    // No op.\n  }\n\n  addLocalQueryTarget(targetId: TargetId): QueryTargetState {\n    this.localState.addQueryTarget(targetId);\n    return this.queryState[targetId] || 'not-current';\n  }\n\n  updateQueryState(\n    targetId: TargetId,\n    state: QueryTargetState,\n    error?: FirestoreError\n  ): void {\n    this.queryState[targetId] = state;\n  }\n\n  removeLocalQueryTarget(targetId: TargetId): void {\n    this.localState.removeQueryTarget(targetId);\n  }\n\n  isLocalQueryTarget(targetId: TargetId): boolean {\n    return this.localState.activeTargetIds.has(targetId);\n  }\n\n  clearQueryState(targetId: TargetId): void {\n    delete this.queryState[targetId];\n  }\n\n  getAllActiveQueryTargets(): TargetIdSet {\n    return this.localState.activeTargetIds;\n  }\n\n  isActiveQueryTarget(targetId: TargetId): boolean {\n    return this.localState.activeTargetIds.has(targetId);\n  }\n\n  start(): Promise<void> {\n    this.localState = new LocalClientState();\n    return Promise.resolve();\n  }\n\n  handleUserChange(\n    user: User,\n    removedBatchIds: BatchId[],\n    addedBatchIds: BatchId[]\n  ): void {\n    // No op.\n  }\n\n  setOnlineState(onlineState: OnlineState): void {\n    // No op.\n  }\n\n  shutdown(): void {}\n\n  writeSequenceNumber(sequenceNumber: ListenSequenceNumber): void {}\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Deferred } from '../util/promise';\nimport { TimerId, AsyncQueue } from '../util/async_queue';\nimport { ExponentialBackoff } from '../remote/backoff';\nimport { Transaction } from './transaction';\nimport { RemoteStore } from '../remote/remote_store';\nimport { isNullOrUndefined } from '../util/types';\nimport { isPermanentError } from '../remote/rpc_error';\nimport { FirestoreError } from '../util/error';\n\nconst RETRY_COUNT = 5;\n\n/**\n * TransactionRunner encapsulates the logic needed to run and retry transactions\n * with backoff.\n */\nexport class TransactionRunner<T> {\n  private retries = RETRY_COUNT;\n  private backoff: ExponentialBackoff;\n\n  constructor(\n    private readonly asyncQueue: AsyncQueue,\n    private readonly remoteStore: RemoteStore,\n    private readonly updateFunction: (transaction: Transaction) => Promise<T>,\n    private readonly deferred: Deferred<T>\n  ) {\n    this.backoff = new ExponentialBackoff(\n      this.asyncQueue,\n      TimerId.TransactionRetry\n    );\n  }\n\n  /** Runs the transaction and sets the result on deferred. */\n  run(): void {\n    this.runWithBackOff();\n  }\n\n  private runWithBackOff(): void {\n    this.backoff.backoffAndRun(async () => {\n      const transaction = this.remoteStore.createTransaction();\n      const userPromise = this.tryRunUpdateFunction(transaction);\n      if (userPromise) {\n        userPromise\n          .then(result => {\n            this.asyncQueue.enqueueAndForget(() => {\n              return transaction\n                .commit()\n                .then(() => {\n                  this.deferred.resolve(result);\n                })\n                .catch(commitError => {\n                  this.handleTransactionError(commitError);\n                });\n            });\n          })\n          .catch(userPromiseError => {\n            this.handleTransactionError(userPromiseError);\n          });\n      }\n    });\n  }\n\n  private tryRunUpdateFunction(transaction: Transaction): Promise<T> | null {\n    try {\n      const userPromise = this.updateFunction(transaction);\n      if (\n        isNullOrUndefined(userPromise) ||\n        !userPromise.catch ||\n        !userPromise.then\n      ) {\n        this.deferred.reject(\n          Error('Transaction callback must return a Promise')\n        );\n        return null;\n      }\n      return userPromise;\n    } catch (error) {\n      // Do not retry errors thrown by user provided updateFunction.\n      this.deferred.reject(error);\n      return null;\n    }\n  }\n\n  private handleTransactionError(error: Error): void {\n    if (this.retries > 0 && this.isRetryableTransactionError(error)) {\n      this.retries -= 1;\n      this.asyncQueue.enqueueAndForget(() => {\n        this.runWithBackOff();\n        return Promise.resolve();\n      });\n    } else {\n      this.deferred.reject(error);\n    }\n  }\n\n  private isRetryableTransactionError(error: Error): boolean {\n    if (error.name === 'FirebaseError') {\n      // In transactions, the backend will fail outdated reads with FAILED_PRECONDITION and\n      // non-matching document versions with ABORTED. These errors should be retried.\n      const code = (error as FirestoreError).code;\n      return (\n        code === 'aborted' ||\n        code === 'failed-precondition' ||\n        !isPermanentError(code)\n      );\n    }\n    return false;\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { QueryEngine } from './query_engine';\nimport { LocalDocumentsView } from './local_documents_view';\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { LimitType, Query } from '../core/query';\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport {\n  DocumentKeySet,\n  DocumentMap,\n  MaybeDocumentMap\n} from '../model/collections';\nimport { Document } from '../model/document';\nimport { debugAssert } from '../util/assert';\nimport { getLogLevel, LogLevel, logDebug } from '../util/log';\nimport { SortedSet } from '../util/sorted_set';\n\n// TOOD(b/140938512): Drop SimpleQueryEngine and rename IndexFreeQueryEngine.\n\n/**\n * A query engine that takes advantage of the target document mapping in the\n * QueryCache. The IndexFreeQueryEngine optimizes query execution by only\n * reading the documents that previously matched a query plus any documents that were\n * edited after the query was last listened to.\n *\n * There are some cases where Index-Free queries are not guaranteed to produce\n * the same results as full collection scans. In these cases, the\n * IndexFreeQueryEngine falls back to full query processing. These cases are:\n *\n * - Limit queries where a document that matched the query previously no longer\n *   matches the query.\n *\n * - Limit queries where a document edit may cause the document to sort below\n *   another document that is in the local cache.\n *\n * - Queries that have never been CURRENT or free of Limbo documents.\n */\nexport class IndexFreeQueryEngine implements QueryEngine {\n  private localDocumentsView: LocalDocumentsView | undefined;\n\n  setLocalDocumentsView(localDocuments: LocalDocumentsView): void {\n    this.localDocumentsView = localDocuments;\n  }\n\n  getDocumentsMatchingQuery(\n    transaction: PersistenceTransaction,\n    query: Query,\n    lastLimboFreeSnapshotVersion: SnapshotVersion,\n    remoteKeys: DocumentKeySet\n  ): PersistencePromise<DocumentMap> {\n    debugAssert(\n      this.localDocumentsView !== undefined,\n      'setLocalDocumentsView() not called'\n    );\n\n    // Queries that match all documents don't benefit from using\n    // IndexFreeQueries. It is more efficient to scan all documents in a\n    // collection, rather than to perform individual lookups.\n    if (query.matchesAllDocuments()) {\n      return this.executeFullCollectionScan(transaction, query);\n    }\n\n    // Queries that have never seen a snapshot without limbo free documents\n    // should also be run as a full collection scan.\n    if (lastLimboFreeSnapshotVersion.isEqual(SnapshotVersion.min())) {\n      return this.executeFullCollectionScan(transaction, query);\n    }\n\n    return this.localDocumentsView!.getDocuments(transaction, remoteKeys).next(\n      documents => {\n        const previousResults = this.applyQuery(query, documents);\n\n        if (\n          (query.hasLimitToFirst() || query.hasLimitToLast()) &&\n          this.needsRefill(\n            query.limitType,\n            previousResults,\n            remoteKeys,\n            lastLimboFreeSnapshotVersion\n          )\n        ) {\n          return this.executeFullCollectionScan(transaction, query);\n        }\n\n        if (getLogLevel() <= LogLevel.DEBUG) {\n          logDebug(\n            'IndexFreeQueryEngine',\n            'Re-using previous result from %s to execute query: %s',\n            lastLimboFreeSnapshotVersion.toString(),\n            query.toString()\n          );\n        }\n\n        // Retrieve all results for documents that were updated since the last\n        // limbo-document free remote snapshot.\n        return this.localDocumentsView!.getDocumentsMatchingQuery(\n          transaction,\n          query,\n          lastLimboFreeSnapshotVersion\n        ).next(updatedResults => {\n          // We merge `previousResults` into `updateResults`, since\n          // `updateResults` is already a DocumentMap. If a document is\n          // contained in both lists, then its contents are the same.\n          previousResults.forEach(doc => {\n            updatedResults = updatedResults.insert(doc.key, doc);\n          });\n          return updatedResults;\n        });\n      }\n    );\n  }\n\n  /** Applies the query filter and sorting to the provided documents.  */\n  private applyQuery(\n    query: Query,\n    documents: MaybeDocumentMap\n  ): SortedSet<Document> {\n    // Sort the documents and re-apply the query filter since previously\n    // matching documents do not necessarily still match the query.\n    let queryResults = new SortedSet<Document>((d1, d2) =>\n      query.docComparator(d1, d2)\n    );\n    documents.forEach((_, maybeDoc) => {\n      if (maybeDoc instanceof Document && query.matches(maybeDoc)) {\n        queryResults = queryResults.add(maybeDoc);\n      }\n    });\n    return queryResults;\n  }\n\n  /**\n   * Determines if a limit query needs to be refilled from cache, making it\n   * ineligible for index-free execution.\n   *\n   * @param sortedPreviousResults The documents that matched the query when it\n   * was last synchronized, sorted by the query's comparator.\n   * @param remoteKeys The document keys that matched the query at the last\n   * snapshot.\n   * @param limboFreeSnapshotVersion The version of the snapshot when the query\n   * was last synchronized.\n   */\n  private needsRefill(\n    limitType: LimitType,\n    sortedPreviousResults: SortedSet<Document>,\n    remoteKeys: DocumentKeySet,\n    limboFreeSnapshotVersion: SnapshotVersion\n  ): boolean {\n    // The query needs to be refilled if a previously matching document no\n    // longer matches.\n    if (remoteKeys.size !== sortedPreviousResults.size) {\n      return true;\n    }\n\n    // Limit queries are not eligible for index-free query execution if there is\n    // a potential that an older document from cache now sorts before a document\n    // that was previously part of the limit. This, however, can only happen if\n    // the document at the edge of the limit goes out of limit.\n    // If a document that is not the limit boundary sorts differently,\n    // the boundary of the limit itself did not change and documents from cache\n    // will continue to be \"rejected\" by this boundary. Therefore, we can ignore\n    // any modifications that don't affect the last document.\n    const docAtLimitEdge =\n      limitType === LimitType.First\n        ? sortedPreviousResults.last()\n        : sortedPreviousResults.first();\n    if (!docAtLimitEdge) {\n      // We don't need to refill the query if there were already no documents.\n      return false;\n    }\n    return (\n      docAtLimitEdge.hasPendingWrites ||\n      docAtLimitEdge.version.compareTo(limboFreeSnapshotVersion) > 0\n    );\n  }\n\n  private executeFullCollectionScan(\n    transaction: PersistenceTransaction,\n    query: Query\n  ): PersistencePromise<DocumentMap> {\n    if (getLogLevel() <= LogLevel.DEBUG) {\n      logDebug(\n        'IndexFreeQueryEngine',\n        'Using full collection scan to execute query:',\n        query.toString()\n      );\n    }\n\n    return this.localDocumentsView!.getDocumentsMatchingQuery(\n      transaction,\n      query,\n      SnapshotVersion.min()\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Timestamp } from '../api/timestamp';\nimport { Query } from '../core/query';\nimport { BatchId } from '../core/types';\nimport { DocumentKey } from '../model/document_key';\nimport { Mutation } from '../model/mutation';\nimport { MutationBatch, BATCHID_UNKNOWN } from '../model/mutation_batch';\nimport { debugAssert, hardAssert } from '../util/assert';\nimport { primitiveComparator } from '../util/misc';\nimport { ByteString } from '../util/byte_string';\nimport { SortedMap } from '../util/sorted_map';\nimport { SortedSet } from '../util/sorted_set';\n\nimport { IndexManager } from './index_manager';\nimport { MutationQueue } from './mutation_queue';\nimport { PersistenceTransaction, ReferenceDelegate } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { DocReference } from './reference_set';\n\nexport class MemoryMutationQueue implements MutationQueue {\n  /**\n   * The set of all mutations that have been sent but not yet been applied to\n   * the backend.\n   */\n  private mutationQueue: MutationBatch[] = [];\n\n  /** Next value to use when assigning sequential IDs to each mutation batch. */\n  private nextBatchId: BatchId = 1;\n\n  /** The last received stream token from the server, used to acknowledge which\n   * responses the client has processed. Stream tokens are opaque checkpoint\n   * markers whose only real value is their inclusion in the next request.\n   */\n  private lastStreamToken: ByteString = ByteString.EMPTY_BYTE_STRING;\n\n  /** An ordered mapping between documents and the mutations batch IDs. */\n  private batchesByDocumentKey = new SortedSet(DocReference.compareByKey);\n\n  constructor(\n    private readonly indexManager: IndexManager,\n    private readonly referenceDelegate: ReferenceDelegate\n  ) {}\n\n  checkEmpty(transaction: PersistenceTransaction): PersistencePromise<boolean> {\n    return PersistencePromise.resolve(this.mutationQueue.length === 0);\n  }\n\n  acknowledgeBatch(\n    transaction: PersistenceTransaction,\n    batch: MutationBatch,\n    streamToken: ByteString\n  ): PersistencePromise<void> {\n    const batchId = batch.batchId;\n    const batchIndex = this.indexOfExistingBatchId(batchId, 'acknowledged');\n    hardAssert(\n      batchIndex === 0,\n      'Can only acknowledge the first batch in the mutation queue'\n    );\n\n    // Verify that the batch in the queue is the one to be acknowledged.\n    const check = this.mutationQueue[batchIndex];\n    debugAssert(\n      batchId === check.batchId,\n      'Queue ordering failure: expected batch ' +\n        batchId +\n        ', got batch ' +\n        check.batchId\n    );\n\n    this.lastStreamToken = streamToken;\n    return PersistencePromise.resolve();\n  }\n\n  getLastStreamToken(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<ByteString> {\n    return PersistencePromise.resolve(this.lastStreamToken);\n  }\n\n  setLastStreamToken(\n    transaction: PersistenceTransaction,\n    streamToken: ByteString\n  ): PersistencePromise<void> {\n    this.lastStreamToken = streamToken;\n    return PersistencePromise.resolve();\n  }\n\n  addMutationBatch(\n    transaction: PersistenceTransaction,\n    localWriteTime: Timestamp,\n    baseMutations: Mutation[],\n    mutations: Mutation[]\n  ): PersistencePromise<MutationBatch> {\n    debugAssert(mutations.length !== 0, 'Mutation batches should not be empty');\n\n    const batchId = this.nextBatchId;\n    this.nextBatchId++;\n\n    if (this.mutationQueue.length > 0) {\n      const prior = this.mutationQueue[this.mutationQueue.length - 1];\n      debugAssert(\n        prior.batchId < batchId,\n        'Mutation batchIDs must be monotonically increasing order'\n      );\n    }\n\n    const batch = new MutationBatch(\n      batchId,\n      localWriteTime,\n      baseMutations,\n      mutations\n    );\n    this.mutationQueue.push(batch);\n\n    // Track references by document key and index collection parents.\n    for (const mutation of mutations) {\n      this.batchesByDocumentKey = this.batchesByDocumentKey.add(\n        new DocReference(mutation.key, batchId)\n      );\n\n      this.indexManager.addToCollectionParentIndex(\n        transaction,\n        mutation.key.path.popLast()\n      );\n    }\n\n    return PersistencePromise.resolve(batch);\n  }\n\n  lookupMutationBatch(\n    transaction: PersistenceTransaction,\n    batchId: BatchId\n  ): PersistencePromise<MutationBatch | null> {\n    return PersistencePromise.resolve(this.findMutationBatch(batchId));\n  }\n\n  getNextMutationBatchAfterBatchId(\n    transaction: PersistenceTransaction,\n    batchId: BatchId\n  ): PersistencePromise<MutationBatch | null> {\n    const nextBatchId = batchId + 1;\n\n    // The requested batchId may still be out of range so normalize it to the\n    // start of the queue.\n    const rawIndex = this.indexOfBatchId(nextBatchId);\n    const index = rawIndex < 0 ? 0 : rawIndex;\n    return PersistencePromise.resolve(\n      this.mutationQueue.length > index ? this.mutationQueue[index] : null\n    );\n  }\n\n  getHighestUnacknowledgedBatchId(): PersistencePromise<BatchId> {\n    return PersistencePromise.resolve(\n      this.mutationQueue.length === 0 ? BATCHID_UNKNOWN : this.nextBatchId - 1\n    );\n  }\n\n  getAllMutationBatches(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<MutationBatch[]> {\n    return PersistencePromise.resolve(this.mutationQueue.slice());\n  }\n\n  getAllMutationBatchesAffectingDocumentKey(\n    transaction: PersistenceTransaction,\n    documentKey: DocumentKey\n  ): PersistencePromise<MutationBatch[]> {\n    const start = new DocReference(documentKey, 0);\n    const end = new DocReference(documentKey, Number.POSITIVE_INFINITY);\n    const result: MutationBatch[] = [];\n    this.batchesByDocumentKey.forEachInRange([start, end], ref => {\n      debugAssert(\n        documentKey.isEqual(ref.key),\n        \"Should only iterate over a single key's batches\"\n      );\n      const batch = this.findMutationBatch(ref.targetOrBatchId);\n      debugAssert(\n        batch !== null,\n        'Batches in the index must exist in the main table'\n      );\n      result.push(batch!);\n    });\n\n    return PersistencePromise.resolve(result);\n  }\n\n  getAllMutationBatchesAffectingDocumentKeys(\n    transaction: PersistenceTransaction,\n    documentKeys: SortedMap<DocumentKey, unknown>\n  ): PersistencePromise<MutationBatch[]> {\n    let uniqueBatchIDs = new SortedSet<number>(primitiveComparator);\n\n    documentKeys.forEach(documentKey => {\n      const start = new DocReference(documentKey, 0);\n      const end = new DocReference(documentKey, Number.POSITIVE_INFINITY);\n      this.batchesByDocumentKey.forEachInRange([start, end], ref => {\n        debugAssert(\n          documentKey.isEqual(ref.key),\n          \"For each key, should only iterate over a single key's batches\"\n        );\n\n        uniqueBatchIDs = uniqueBatchIDs.add(ref.targetOrBatchId);\n      });\n    });\n\n    return PersistencePromise.resolve(this.findMutationBatches(uniqueBatchIDs));\n  }\n\n  getAllMutationBatchesAffectingQuery(\n    transaction: PersistenceTransaction,\n    query: Query\n  ): PersistencePromise<MutationBatch[]> {\n    debugAssert(\n      !query.isCollectionGroupQuery(),\n      'CollectionGroup queries should be handled in LocalDocumentsView'\n    );\n    // Use the query path as a prefix for testing if a document matches the\n    // query.\n    const prefix = query.path;\n    const immediateChildrenPathLength = prefix.length + 1;\n\n    // Construct a document reference for actually scanning the index. Unlike\n    // the prefix the document key in this reference must have an even number of\n    // segments. The empty segment can be used a suffix of the query path\n    // because it precedes all other segments in an ordered traversal.\n    let startPath = prefix;\n    if (!DocumentKey.isDocumentKey(startPath)) {\n      startPath = startPath.child('');\n    }\n\n    const start = new DocReference(new DocumentKey(startPath), 0);\n\n    // Find unique batchIDs referenced by all documents potentially matching the\n    // query.\n    let uniqueBatchIDs = new SortedSet<number>(primitiveComparator);\n\n    this.batchesByDocumentKey.forEachWhile(ref => {\n      const rowKeyPath = ref.key.path;\n      if (!prefix.isPrefixOf(rowKeyPath)) {\n        return false;\n      } else {\n        // Rows with document keys more than one segment longer than the query\n        // path can't be matches. For example, a query on 'rooms' can't match\n        // the document /rooms/abc/messages/xyx.\n        // TODO(mcg): we'll need a different scanner when we implement\n        // ancestor queries.\n        if (rowKeyPath.length === immediateChildrenPathLength) {\n          uniqueBatchIDs = uniqueBatchIDs.add(ref.targetOrBatchId);\n        }\n        return true;\n      }\n    }, start);\n\n    return PersistencePromise.resolve(this.findMutationBatches(uniqueBatchIDs));\n  }\n\n  private findMutationBatches(batchIDs: SortedSet<number>): MutationBatch[] {\n    // Construct an array of matching batches, sorted by batchID to ensure that\n    // multiple mutations affecting the same document key are applied in order.\n    const result: MutationBatch[] = [];\n    batchIDs.forEach(batchId => {\n      const batch = this.findMutationBatch(batchId);\n      if (batch !== null) {\n        result.push(batch);\n      }\n    });\n    return result;\n  }\n\n  removeMutationBatch(\n    transaction: PersistenceTransaction,\n    batch: MutationBatch\n  ): PersistencePromise<void> {\n    // Find the position of the first batch for removal.\n    const batchIndex = this.indexOfExistingBatchId(batch.batchId, 'removed');\n    hardAssert(\n      batchIndex === 0,\n      'Can only remove the first entry of the mutation queue'\n    );\n    this.mutationQueue.shift();\n\n    let references = this.batchesByDocumentKey;\n    return PersistencePromise.forEach(batch.mutations, (mutation: Mutation) => {\n      const ref = new DocReference(mutation.key, batch.batchId);\n      references = references.delete(ref);\n      return this.referenceDelegate.markPotentiallyOrphaned(\n        transaction,\n        mutation.key\n      );\n    }).next(() => {\n      this.batchesByDocumentKey = references;\n    });\n  }\n\n  removeCachedMutationKeys(batchId: BatchId): void {\n    // No-op since the memory mutation queue does not maintain a separate cache.\n  }\n\n  containsKey(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<boolean> {\n    const ref = new DocReference(key, 0);\n    const firstRef = this.batchesByDocumentKey.firstAfterOrEqual(ref);\n    return PersistencePromise.resolve(key.isEqual(firstRef && firstRef.key));\n  }\n\n  performConsistencyCheck(\n    txn: PersistenceTransaction\n  ): PersistencePromise<void> {\n    if (this.mutationQueue.length === 0) {\n      debugAssert(\n        this.batchesByDocumentKey.isEmpty(),\n        'Document leak -- detected dangling mutation references when queue is empty.'\n      );\n    }\n    return PersistencePromise.resolve();\n  }\n\n  /**\n   * Finds the index of the given batchId in the mutation queue and asserts that\n   * the resulting index is within the bounds of the queue.\n   *\n   * @param batchId The batchId to search for\n   * @param action A description of what the caller is doing, phrased in passive\n   * form (e.g. \"acknowledged\" in a routine that acknowledges batches).\n   */\n  private indexOfExistingBatchId(batchId: BatchId, action: string): number {\n    const index = this.indexOfBatchId(batchId);\n    debugAssert(\n      index >= 0 && index < this.mutationQueue.length,\n      'Batches must exist to be ' + action\n    );\n    return index;\n  }\n\n  /**\n   * Finds the index of the given batchId in the mutation queue. This operation\n   * is O(1).\n   *\n   * @return The computed index of the batch with the given batchId, based on\n   * the state of the queue. Note this index can be negative if the requested\n   * batchId has already been remvoed from the queue or past the end of the\n   * queue if the batchId is larger than the last added batch.\n   */\n  private indexOfBatchId(batchId: BatchId): number {\n    if (this.mutationQueue.length === 0) {\n      // As an index this is past the end of the queue\n      return 0;\n    }\n\n    // Examine the front of the queue to figure out the difference between the\n    // batchId and indexes in the array. Note that since the queue is ordered\n    // by batchId, if the first batch has a larger batchId then the requested\n    // batchId doesn't exist in the queue.\n    const firstBatchId = this.mutationQueue[0].batchId;\n    return batchId - firstBatchId;\n  }\n\n  /**\n   * A version of lookupMutationBatch that doesn't return a promise, this makes\n   * other functions that uses this code easier to read and more efficent.\n   */\n  private findMutationBatch(batchId: BatchId): MutationBatch | null {\n    const index = this.indexOfBatchId(batchId);\n    if (index < 0 || index >= this.mutationQueue.length) {\n      return null;\n    }\n\n    const batch = this.mutationQueue[index];\n    debugAssert(batch.batchId === batchId, 'If found batch must match');\n    return batch;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Query } from '../core/query';\nimport {\n  DocumentKeySet,\n  DocumentMap,\n  documentMap,\n  DocumentSizeEntry,\n  NullableMaybeDocumentMap,\n  nullableMaybeDocumentMap\n} from '../model/collections';\nimport { Document, MaybeDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { debugAssert } from '../util/assert';\nimport { SortedMap } from '../util/sorted_map';\nimport { IndexManager } from './index_manager';\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { RemoteDocumentCache } from './remote_document_cache';\nimport { RemoteDocumentChangeBuffer } from './remote_document_change_buffer';\n\nexport type DocumentSizer = (doc: MaybeDocument) => number;\n\n/** Miscellaneous collection types / constants. */\ninterface MemoryRemoteDocumentCacheEntry extends DocumentSizeEntry {\n  readTime: SnapshotVersion;\n}\n\ntype DocumentEntryMap = SortedMap<DocumentKey, MemoryRemoteDocumentCacheEntry>;\nfunction documentEntryMap(): DocumentEntryMap {\n  return new SortedMap<DocumentKey, MemoryRemoteDocumentCacheEntry>(\n    DocumentKey.comparator\n  );\n}\n\nexport class MemoryRemoteDocumentCache implements RemoteDocumentCache {\n  /** Underlying cache of documents and their read times. */\n  private docs = documentEntryMap();\n\n  /** Size of all cached documents. */\n  private size = 0;\n\n  /**\n   * @param sizer Used to assess the size of a document. For eager GC, this is expected to just\n   * return 0 to avoid unnecessarily doing the work of calculating the size.\n   */\n  constructor(\n    private readonly indexManager: IndexManager,\n    private readonly sizer: DocumentSizer\n  ) {}\n\n  /**\n   * Adds the supplied entry to the cache and updates the cache size as appropriate.\n   *\n   * All calls of `addEntry`  are required to go through the RemoteDocumentChangeBuffer\n   * returned by `newChangeBuffer()`.\n   */\n  private addEntry(\n    transaction: PersistenceTransaction,\n    doc: MaybeDocument,\n    readTime: SnapshotVersion\n  ): PersistencePromise<void> {\n    debugAssert(\n      !readTime.isEqual(SnapshotVersion.min()),\n      'Cannot add a document with a read time of zero'\n    );\n\n    const key = doc.key;\n    const entry = this.docs.get(key);\n    const previousSize = entry ? entry.size : 0;\n    const currentSize = this.sizer(doc);\n\n    this.docs = this.docs.insert(key, {\n      maybeDocument: doc,\n      size: currentSize,\n      readTime\n    });\n\n    this.size += currentSize - previousSize;\n\n    return this.indexManager.addToCollectionParentIndex(\n      transaction,\n      key.path.popLast()\n    );\n  }\n\n  /**\n   * Removes the specified entry from the cache and updates the cache size as appropriate.\n   *\n   * All calls of `removeEntry` are required to go through the RemoteDocumentChangeBuffer\n   * returned by `newChangeBuffer()`.\n   */\n  private removeEntry(documentKey: DocumentKey): void {\n    const entry = this.docs.get(documentKey);\n    if (entry) {\n      this.docs = this.docs.remove(documentKey);\n      this.size -= entry.size;\n    }\n  }\n\n  getEntry(\n    transaction: PersistenceTransaction,\n    documentKey: DocumentKey\n  ): PersistencePromise<MaybeDocument | null> {\n    const entry = this.docs.get(documentKey);\n    return PersistencePromise.resolve(entry ? entry.maybeDocument : null);\n  }\n\n  getEntries(\n    transaction: PersistenceTransaction,\n    documentKeys: DocumentKeySet\n  ): PersistencePromise<NullableMaybeDocumentMap> {\n    let results = nullableMaybeDocumentMap();\n    documentKeys.forEach(documentKey => {\n      const entry = this.docs.get(documentKey);\n      results = results.insert(documentKey, entry ? entry.maybeDocument : null);\n    });\n    return PersistencePromise.resolve(results);\n  }\n\n  getDocumentsMatchingQuery(\n    transaction: PersistenceTransaction,\n    query: Query,\n    sinceReadTime: SnapshotVersion\n  ): PersistencePromise<DocumentMap> {\n    debugAssert(\n      !query.isCollectionGroupQuery(),\n      'CollectionGroup queries should be handled in LocalDocumentsView'\n    );\n    let results = documentMap();\n\n    // Documents are ordered by key, so we can use a prefix scan to narrow down\n    // the documents we need to match the query against.\n    const prefix = new DocumentKey(query.path.child(''));\n    const iterator = this.docs.getIteratorFrom(prefix);\n    while (iterator.hasNext()) {\n      const {\n        key,\n        value: { maybeDocument, readTime }\n      } = iterator.getNext();\n      if (!query.path.isPrefixOf(key.path)) {\n        break;\n      }\n      if (readTime.compareTo(sinceReadTime) <= 0) {\n        continue;\n      }\n      if (maybeDocument instanceof Document && query.matches(maybeDocument)) {\n        results = results.insert(maybeDocument.key, maybeDocument);\n      }\n    }\n    return PersistencePromise.resolve(results);\n  }\n\n  forEachDocumentKey(\n    transaction: PersistenceTransaction,\n    f: (key: DocumentKey) => PersistencePromise<void>\n  ): PersistencePromise<void> {\n    return PersistencePromise.forEach(this.docs, (key: DocumentKey) => f(key));\n  }\n\n  newChangeBuffer(options?: {\n    trackRemovals: boolean;\n  }): RemoteDocumentChangeBuffer {\n    // `trackRemovals` is ignores since the MemoryRemoteDocumentCache keeps\n    // a separate changelog and does not need special handling for removals.\n    return new MemoryRemoteDocumentCache.RemoteDocumentChangeBuffer(this);\n  }\n\n  getSize(txn: PersistenceTransaction): PersistencePromise<number> {\n    return PersistencePromise.resolve(this.size);\n  }\n\n  /**\n   * Handles the details of adding and updating documents in the MemoryRemoteDocumentCache.\n   */\n  private static RemoteDocumentChangeBuffer = class extends RemoteDocumentChangeBuffer {\n    constructor(private readonly documentCache: MemoryRemoteDocumentCache) {\n      super();\n    }\n\n    protected applyChanges(\n      transaction: PersistenceTransaction\n    ): PersistencePromise<void> {\n      const promises: Array<PersistencePromise<void>> = [];\n      this.changes.forEach((key, doc) => {\n        if (doc) {\n          promises.push(\n            this.documentCache.addEntry(transaction, doc, this.readTime)\n          );\n        } else {\n          this.documentCache.removeEntry(key);\n        }\n      });\n      return PersistencePromise.waitFor(promises);\n    }\n\n    protected getFromCache(\n      transaction: PersistenceTransaction,\n      documentKey: DocumentKey\n    ): PersistencePromise<MaybeDocument | null> {\n      return this.documentCache.getEntry(transaction, documentKey);\n    }\n\n    protected getAllFromCache(\n      transaction: PersistenceTransaction,\n      documentKeys: DocumentKeySet\n    ): PersistencePromise<NullableMaybeDocumentMap> {\n      return this.documentCache.getEntries(transaction, documentKeys);\n    }\n  };\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SnapshotVersion } from '../core/snapshot_version';\nimport { TargetIdGenerator } from '../core/target_id_generator';\nimport { ListenSequenceNumber, TargetId } from '../core/types';\nimport { DocumentKeySet } from '../model/collections';\nimport { DocumentKey } from '../model/document_key';\nimport { debugAssert } from '../util/assert';\nimport { ObjectMap } from '../util/obj_map';\n\nimport { ActiveTargets } from './lru_garbage_collector';\nimport { MemoryPersistence } from './memory_persistence';\nimport { PersistenceTransaction } from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { ReferenceSet } from './reference_set';\nimport { TargetCache } from './target_cache';\nimport { TargetData } from './target_data';\nimport { Target } from '../core/target';\n\nexport class MemoryTargetCache implements TargetCache {\n  /**\n   * Maps a target to the data about that target\n   */\n  private targets = new ObjectMap<Target, TargetData>(t => t.canonicalId());\n\n  /** The last received snapshot version. */\n  private lastRemoteSnapshotVersion = SnapshotVersion.min();\n  /** The highest numbered target ID encountered. */\n  private highestTargetId: TargetId = 0;\n  /** The highest sequence number encountered. */\n  private highestSequenceNumber: ListenSequenceNumber = 0;\n  /**\n   * A ordered bidirectional mapping between documents and the remote target\n   * IDs.\n   */\n  private references = new ReferenceSet();\n\n  private targetCount = 0;\n\n  private targetIdGenerator = TargetIdGenerator.forTargetCache();\n\n  constructor(private readonly persistence: MemoryPersistence) {}\n\n  forEachTarget(\n    txn: PersistenceTransaction,\n    f: (q: TargetData) => void\n  ): PersistencePromise<void> {\n    this.targets.forEach((_, targetData) => f(targetData));\n    return PersistencePromise.resolve();\n  }\n\n  getLastRemoteSnapshotVersion(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<SnapshotVersion> {\n    return PersistencePromise.resolve(this.lastRemoteSnapshotVersion);\n  }\n\n  getHighestSequenceNumber(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<ListenSequenceNumber> {\n    return PersistencePromise.resolve(this.highestSequenceNumber);\n  }\n\n  allocateTargetId(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<TargetId> {\n    this.highestTargetId = this.targetIdGenerator.next();\n    return PersistencePromise.resolve(this.highestTargetId);\n  }\n\n  setTargetsMetadata(\n    transaction: PersistenceTransaction,\n    highestListenSequenceNumber: number,\n    lastRemoteSnapshotVersion?: SnapshotVersion\n  ): PersistencePromise<void> {\n    if (lastRemoteSnapshotVersion) {\n      this.lastRemoteSnapshotVersion = lastRemoteSnapshotVersion;\n    }\n    if (highestListenSequenceNumber > this.highestSequenceNumber) {\n      this.highestSequenceNumber = highestListenSequenceNumber;\n    }\n    return PersistencePromise.resolve();\n  }\n\n  private saveTargetData(targetData: TargetData): void {\n    this.targets.set(targetData.target, targetData);\n    const targetId = targetData.targetId;\n    if (targetId > this.highestTargetId) {\n      this.targetIdGenerator = new TargetIdGenerator(targetId);\n      this.highestTargetId = targetId;\n    }\n    if (targetData.sequenceNumber > this.highestSequenceNumber) {\n      this.highestSequenceNumber = targetData.sequenceNumber;\n    }\n  }\n\n  addTargetData(\n    transaction: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    debugAssert(\n      !this.targets.has(targetData.target),\n      'Adding a target that already exists'\n    );\n    this.saveTargetData(targetData);\n    this.targetCount += 1;\n    return PersistencePromise.resolve();\n  }\n\n  updateTargetData(\n    transaction: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    debugAssert(\n      this.targets.has(targetData.target),\n      'Updating a non-existent target'\n    );\n    this.saveTargetData(targetData);\n    return PersistencePromise.resolve();\n  }\n\n  removeTargetData(\n    transaction: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    debugAssert(this.targetCount > 0, 'Removing a target from an empty cache');\n    debugAssert(\n      this.targets.has(targetData.target),\n      'Removing a non-existent target from the cache'\n    );\n    this.targets.delete(targetData.target);\n    this.references.removeReferencesForId(targetData.targetId);\n    this.targetCount -= 1;\n    return PersistencePromise.resolve();\n  }\n\n  removeTargets(\n    transaction: PersistenceTransaction,\n    upperBound: ListenSequenceNumber,\n    activeTargetIds: ActiveTargets\n  ): PersistencePromise<number> {\n    let count = 0;\n    const removals: Array<PersistencePromise<void>> = [];\n    this.targets.forEach((key, targetData) => {\n      if (\n        targetData.sequenceNumber <= upperBound &&\n        activeTargetIds.get(targetData.targetId) === null\n      ) {\n        this.targets.delete(key);\n        removals.push(\n          this.removeMatchingKeysForTargetId(transaction, targetData.targetId)\n        );\n        count++;\n      }\n    });\n    return PersistencePromise.waitFor(removals).next(() => count);\n  }\n\n  getTargetCount(\n    transaction: PersistenceTransaction\n  ): PersistencePromise<number> {\n    return PersistencePromise.resolve(this.targetCount);\n  }\n\n  getTargetData(\n    transaction: PersistenceTransaction,\n    target: Target\n  ): PersistencePromise<TargetData | null> {\n    const targetData = this.targets.get(target) || null;\n    return PersistencePromise.resolve(targetData);\n  }\n\n  addMatchingKeys(\n    txn: PersistenceTransaction,\n    keys: DocumentKeySet,\n    targetId: TargetId\n  ): PersistencePromise<void> {\n    this.references.addReferences(keys, targetId);\n    return PersistencePromise.resolve();\n  }\n\n  removeMatchingKeys(\n    txn: PersistenceTransaction,\n    keys: DocumentKeySet,\n    targetId: TargetId\n  ): PersistencePromise<void> {\n    this.references.removeReferences(keys, targetId);\n    const referenceDelegate = this.persistence.referenceDelegate;\n    const promises: Array<PersistencePromise<void>> = [];\n    if (referenceDelegate) {\n      keys.forEach(key => {\n        promises.push(referenceDelegate.markPotentiallyOrphaned(txn, key));\n      });\n    }\n    return PersistencePromise.waitFor(promises);\n  }\n\n  removeMatchingKeysForTargetId(\n    txn: PersistenceTransaction,\n    targetId: TargetId\n  ): PersistencePromise<void> {\n    this.references.removeReferencesForId(targetId);\n    return PersistencePromise.resolve();\n  }\n\n  getMatchingKeysForTargetId(\n    txn: PersistenceTransaction,\n    targetId: TargetId\n  ): PersistencePromise<DocumentKeySet> {\n    const matchingKeys = this.references.referencesForId(targetId);\n    return PersistencePromise.resolve(matchingKeys);\n  }\n\n  containsKey(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<boolean> {\n    return PersistencePromise.resolve(this.references.containsKey(key));\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { User } from '../auth/user';\nimport { Document, MaybeDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { fail } from '../util/assert';\nimport { logDebug } from '../util/log';\nimport { ObjectMap } from '../util/obj_map';\nimport { encodeResourcePath } from './encoded_resource_path';\nimport {\n  ActiveTargets,\n  LruDelegate,\n  LruGarbageCollector,\n  LruParams\n} from './lru_garbage_collector';\nimport { ListenSequence } from '../core/listen_sequence';\nimport { ListenSequenceNumber, TargetId } from '../core/types';\nimport { estimateByteSize } from '../model/values';\nimport { MemoryIndexManager } from './memory_index_manager';\nimport { MemoryMutationQueue } from './memory_mutation_queue';\nimport { MemoryRemoteDocumentCache } from './memory_remote_document_cache';\nimport { MemoryTargetCache } from './memory_target_cache';\nimport { MutationQueue } from './mutation_queue';\nimport {\n  Persistence,\n  PersistenceTransaction,\n  PersistenceTransactionMode,\n  ReferenceDelegate\n} from './persistence';\nimport { PersistencePromise } from './persistence_promise';\nimport { ReferenceSet } from './reference_set';\nimport { TargetData } from './target_data';\n\nconst LOG_TAG = 'MemoryPersistence';\n/**\n * A memory-backed instance of Persistence. Data is stored only in RAM and\n * not persisted across sessions.\n */\nexport class MemoryPersistence implements Persistence {\n  /**\n   * Note that these are retained here to make it easier to write tests\n   * affecting both the in-memory and IndexedDB-backed persistence layers. Tests\n   * can create a new LocalStore wrapping this Persistence instance and this\n   * will make the in-memory persistence layer behave as if it were actually\n   * persisting values.\n   */\n  private readonly indexManager: MemoryIndexManager;\n  private mutationQueues: { [user: string]: MemoryMutationQueue } = {};\n  private readonly remoteDocumentCache: MemoryRemoteDocumentCache;\n  private readonly targetCache: MemoryTargetCache;\n  private readonly listenSequence = new ListenSequence(0);\n\n  private _started = false;\n\n  readonly referenceDelegate: MemoryReferenceDelegate;\n\n  /**\n   * The constructor accepts a factory for creating a reference delegate. This\n   * allows both the delegate and this instance to have strong references to\n   * each other without having nullable fields that would then need to be\n   * checked or asserted on every access.\n   */\n  constructor(\n    referenceDelegateFactory: (p: MemoryPersistence) => MemoryReferenceDelegate\n  ) {\n    this._started = true;\n    this.referenceDelegate = referenceDelegateFactory(this);\n    this.targetCache = new MemoryTargetCache(this);\n    const sizer = (doc: MaybeDocument): number =>\n      this.referenceDelegate.documentSize(doc);\n    this.indexManager = new MemoryIndexManager();\n    this.remoteDocumentCache = new MemoryRemoteDocumentCache(\n      this.indexManager,\n      sizer\n    );\n  }\n\n  start(): Promise<void> {\n    return Promise.resolve();\n  }\n\n  shutdown(): Promise<void> {\n    // No durable state to ensure is closed on shutdown.\n    this._started = false;\n    return Promise.resolve();\n  }\n\n  get started(): boolean {\n    return this._started;\n  }\n\n  setDatabaseDeletedListener(): void {\n    // No op.\n  }\n\n  getIndexManager(): MemoryIndexManager {\n    return this.indexManager;\n  }\n\n  getMutationQueue(user: User): MutationQueue {\n    let queue = this.mutationQueues[user.toKey()];\n    if (!queue) {\n      queue = new MemoryMutationQueue(\n        this.indexManager,\n        this.referenceDelegate\n      );\n      this.mutationQueues[user.toKey()] = queue;\n    }\n    return queue;\n  }\n\n  getTargetCache(): MemoryTargetCache {\n    return this.targetCache;\n  }\n\n  getRemoteDocumentCache(): MemoryRemoteDocumentCache {\n    return this.remoteDocumentCache;\n  }\n\n  runTransaction<T>(\n    action: string,\n    mode: PersistenceTransactionMode,\n    transactionOperation: (\n      transaction: PersistenceTransaction\n    ) => PersistencePromise<T>\n  ): Promise<T> {\n    logDebug(LOG_TAG, 'Starting transaction:', action);\n    const txn = new MemoryTransaction(this.listenSequence.next());\n    this.referenceDelegate.onTransactionStarted();\n    return transactionOperation(txn)\n      .next(result => {\n        return this.referenceDelegate\n          .onTransactionCommitted(txn)\n          .next(() => result);\n      })\n      .toPromise()\n      .then(result => {\n        txn.raiseOnCommittedEvent();\n        return result;\n      });\n  }\n\n  mutationQueuesContainKey(\n    transaction: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<boolean> {\n    return PersistencePromise.or(\n      Object.values(this.mutationQueues).map(queue => () =>\n        queue.containsKey(transaction, key)\n      )\n    );\n  }\n}\n\n/**\n * Memory persistence is not actually transactional, but future implementations\n * may have transaction-scoped state.\n */\nexport class MemoryTransaction extends PersistenceTransaction {\n  constructor(readonly currentSequenceNumber: ListenSequenceNumber) {\n    super();\n  }\n}\n\nexport interface MemoryReferenceDelegate extends ReferenceDelegate {\n  documentSize(doc: MaybeDocument): number;\n  onTransactionStarted(): void;\n  onTransactionCommitted(txn: PersistenceTransaction): PersistencePromise<void>;\n}\n\nexport class MemoryEagerDelegate implements MemoryReferenceDelegate {\n  /** Tracks all documents that are active in Query views. */\n  private localViewReferences: ReferenceSet = new ReferenceSet();\n  /** The list of documents that are potentially GCed after each transaction. */\n  private _orphanedDocuments: Set<DocumentKey> | null = null;\n\n  private constructor(private readonly persistence: MemoryPersistence) {}\n\n  static factory(persistence: MemoryPersistence): MemoryEagerDelegate {\n    return new MemoryEagerDelegate(persistence);\n  }\n\n  private get orphanedDocuments(): Set<DocumentKey> {\n    if (!this._orphanedDocuments) {\n      throw fail('orphanedDocuments is only valid during a transaction.');\n    } else {\n      return this._orphanedDocuments;\n    }\n  }\n\n  addReference(\n    txn: PersistenceTransaction,\n    targetId: TargetId,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    this.localViewReferences.addReference(key, targetId);\n    this.orphanedDocuments.delete(key);\n    return PersistencePromise.resolve();\n  }\n\n  removeReference(\n    txn: PersistenceTransaction,\n    targetId: TargetId,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    this.localViewReferences.removeReference(key, targetId);\n    this.orphanedDocuments.add(key);\n    return PersistencePromise.resolve();\n  }\n\n  markPotentiallyOrphaned(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    this.orphanedDocuments.add(key);\n    return PersistencePromise.resolve();\n  }\n\n  removeTarget(\n    txn: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    const orphaned = this.localViewReferences.removeReferencesForId(\n      targetData.targetId\n    );\n    orphaned.forEach(key => this.orphanedDocuments.add(key));\n    const cache = this.persistence.getTargetCache();\n    return cache\n      .getMatchingKeysForTargetId(txn, targetData.targetId)\n      .next(keys => {\n        keys.forEach(key => this.orphanedDocuments.add(key));\n      })\n      .next(() => cache.removeTargetData(txn, targetData));\n  }\n\n  onTransactionStarted(): void {\n    this._orphanedDocuments = new Set<DocumentKey>();\n  }\n\n  onTransactionCommitted(\n    txn: PersistenceTransaction\n  ): PersistencePromise<void> {\n    // Remove newly orphaned documents.\n    const cache = this.persistence.getRemoteDocumentCache();\n    const changeBuffer = cache.newChangeBuffer();\n    return PersistencePromise.forEach(\n      this.orphanedDocuments,\n      (key: DocumentKey) => {\n        return this.isReferenced(txn, key).next(isReferenced => {\n          if (!isReferenced) {\n            changeBuffer.removeEntry(key);\n          }\n        });\n      }\n    ).next(() => {\n      this._orphanedDocuments = null;\n      return changeBuffer.apply(txn);\n    });\n  }\n\n  updateLimboDocument(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    return this.isReferenced(txn, key).next(isReferenced => {\n      if (isReferenced) {\n        this.orphanedDocuments.delete(key);\n      } else {\n        this.orphanedDocuments.add(key);\n      }\n    });\n  }\n\n  documentSize(doc: MaybeDocument): number {\n    // For eager GC, we don't care about the document size, there are no size thresholds.\n    return 0;\n  }\n\n  private isReferenced(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<boolean> {\n    return PersistencePromise.or([\n      () =>\n        PersistencePromise.resolve(this.localViewReferences.containsKey(key)),\n      () => this.persistence.getTargetCache().containsKey(txn, key),\n      () => this.persistence.mutationQueuesContainKey(txn, key)\n    ]);\n  }\n}\n\nexport class MemoryLruDelegate implements ReferenceDelegate, LruDelegate {\n  private orphanedSequenceNumbers: ObjectMap<\n    DocumentKey,\n    ListenSequenceNumber\n  > = new ObjectMap(k => encodeResourcePath(k.path));\n\n  readonly garbageCollector: LruGarbageCollector;\n\n  constructor(\n    private readonly persistence: MemoryPersistence,\n    lruParams: LruParams\n  ) {\n    this.garbageCollector = new LruGarbageCollector(this, lruParams);\n  }\n\n  // No-ops, present so memory persistence doesn't have to care which delegate\n  // it has.\n  onTransactionStarted(): void {}\n\n  onTransactionCommitted(\n    txn: PersistenceTransaction\n  ): PersistencePromise<void> {\n    return PersistencePromise.resolve();\n  }\n\n  forEachTarget(\n    txn: PersistenceTransaction,\n    f: (q: TargetData) => void\n  ): PersistencePromise<void> {\n    return this.persistence.getTargetCache().forEachTarget(txn, f);\n  }\n\n  getSequenceNumberCount(\n    txn: PersistenceTransaction\n  ): PersistencePromise<number> {\n    const docCountPromise = this.orphanedDocumentCount(txn);\n    const targetCountPromise = this.persistence\n      .getTargetCache()\n      .getTargetCount(txn);\n    return targetCountPromise.next(targetCount =>\n      docCountPromise.next(docCount => targetCount + docCount)\n    );\n  }\n\n  private orphanedDocumentCount(\n    txn: PersistenceTransaction\n  ): PersistencePromise<number> {\n    let orphanedCount = 0;\n    return this.forEachOrphanedDocumentSequenceNumber(txn, _ => {\n      orphanedCount++;\n    }).next(() => orphanedCount);\n  }\n\n  forEachOrphanedDocumentSequenceNumber(\n    txn: PersistenceTransaction,\n    f: (sequenceNumber: ListenSequenceNumber) => void\n  ): PersistencePromise<void> {\n    return PersistencePromise.forEach(\n      this.orphanedSequenceNumbers,\n      (key, sequenceNumber) => {\n        // Pass in the exact sequence number as the upper bound so we know it won't be pinned by\n        // being too recent.\n        return this.isPinned(txn, key, sequenceNumber).next(isPinned => {\n          if (!isPinned) {\n            return f(sequenceNumber);\n          } else {\n            return PersistencePromise.resolve();\n          }\n        });\n      }\n    );\n  }\n\n  removeTargets(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber,\n    activeTargetIds: ActiveTargets\n  ): PersistencePromise<number> {\n    return this.persistence\n      .getTargetCache()\n      .removeTargets(txn, upperBound, activeTargetIds);\n  }\n\n  removeOrphanedDocuments(\n    txn: PersistenceTransaction,\n    upperBound: ListenSequenceNumber\n  ): PersistencePromise<number> {\n    let count = 0;\n    const cache = this.persistence.getRemoteDocumentCache();\n    const changeBuffer = cache.newChangeBuffer();\n    const p = cache.forEachDocumentKey(txn, key => {\n      return this.isPinned(txn, key, upperBound).next(isPinned => {\n        if (!isPinned) {\n          count++;\n          changeBuffer.removeEntry(key);\n        }\n      });\n    });\n    return p.next(() => changeBuffer.apply(txn)).next(() => count);\n  }\n\n  markPotentiallyOrphaned(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    this.orphanedSequenceNumbers.set(key, txn.currentSequenceNumber);\n    return PersistencePromise.resolve();\n  }\n\n  removeTarget(\n    txn: PersistenceTransaction,\n    targetData: TargetData\n  ): PersistencePromise<void> {\n    const updated = targetData.withSequenceNumber(txn.currentSequenceNumber);\n    return this.persistence.getTargetCache().updateTargetData(txn, updated);\n  }\n\n  addReference(\n    txn: PersistenceTransaction,\n    targetId: TargetId,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    this.orphanedSequenceNumbers.set(key, txn.currentSequenceNumber);\n    return PersistencePromise.resolve();\n  }\n\n  removeReference(\n    txn: PersistenceTransaction,\n    targetId: TargetId,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    this.orphanedSequenceNumbers.set(key, txn.currentSequenceNumber);\n    return PersistencePromise.resolve();\n  }\n\n  updateLimboDocument(\n    txn: PersistenceTransaction,\n    key: DocumentKey\n  ): PersistencePromise<void> {\n    this.orphanedSequenceNumbers.set(key, txn.currentSequenceNumber);\n    return PersistencePromise.resolve();\n  }\n\n  documentSize(maybeDoc: MaybeDocument): number {\n    let documentSize = maybeDoc.key.toString().length;\n    if (maybeDoc instanceof Document) {\n      documentSize += estimateByteSize(maybeDoc.toProto());\n    }\n    return documentSize;\n  }\n\n  private isPinned(\n    txn: PersistenceTransaction,\n    key: DocumentKey,\n    upperBound: ListenSequenceNumber\n  ): PersistencePromise<boolean> {\n    return PersistencePromise.or([\n      () => this.persistence.mutationQueuesContainKey(txn, key),\n      () => this.persistence.getTargetCache().containsKey(txn, key),\n      () => {\n        const orphanedAt = this.orphanedSequenceNumbers.get(key);\n        return PersistencePromise.resolve(\n          orphanedAt !== undefined && orphanedAt > upperBound\n        );\n      }\n    ]);\n  }\n\n  getCacheSize(txn: PersistenceTransaction): PersistencePromise<number> {\n    return this.persistence.getRemoteDocumentCache().getSize(txn);\n  }\n}\n","/**\n * @license\n * Copyright 2020 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  ClientId,\n  MemorySharedClientState,\n  SharedClientState,\n  WebStorageSharedClientState\n} from '../local/shared_client_state';\nimport { LocalStore, MultiTabLocalStore } from '../local/local_store';\nimport { MultiTabSyncEngine, SyncEngine } from './sync_engine';\nimport { RemoteStore } from '../remote/remote_store';\nimport { EventManager } from './event_manager';\nimport { AsyncQueue } from '../util/async_queue';\nimport { DatabaseInfo } from './database_info';\nimport { Platform } from '../platform/platform';\nimport { Datastore } from '../remote/datastore';\nimport { User } from '../auth/user';\nimport { PersistenceSettings } from './firestore_client';\nimport { debugAssert } from '../util/assert';\nimport { GarbageCollectionScheduler, Persistence } from '../local/persistence';\nimport { Code, FirestoreError } from '../util/error';\nimport { OnlineStateSource } from './types';\nimport { LruParams, LruScheduler } from '../local/lru_garbage_collector';\nimport { IndexFreeQueryEngine } from '../local/index_free_query_engine';\nimport { IndexedDbPersistence } from '../local/indexeddb_persistence';\nimport {\n  MemoryEagerDelegate,\n  MemoryPersistence\n} from '../local/memory_persistence';\n\nconst MEMORY_ONLY_PERSISTENCE_ERROR_MESSAGE =\n  'You are using the memory-only build of Firestore. Persistence support is ' +\n  'only available via the @firebase/firestore bundle or the ' +\n  'firebase-firestore.js build.';\n\nexport interface ComponentConfiguration {\n  asyncQueue: AsyncQueue;\n  databaseInfo: DatabaseInfo;\n  platform: Platform;\n  datastore: Datastore;\n  clientId: ClientId;\n  initialUser: User;\n  maxConcurrentLimboResolutions: number;\n  persistenceSettings: PersistenceSettings;\n}\n\n/**\n * Initializes and wires up all core components for Firestore. Implementations\n * override `initialize()` to provide all components.\n */\nexport interface ComponentProvider {\n  persistence: Persistence;\n  sharedClientState: SharedClientState;\n  localStore: LocalStore;\n  syncEngine: SyncEngine;\n  gcScheduler: GarbageCollectionScheduler | null;\n  remoteStore: RemoteStore;\n  eventManager: EventManager;\n\n  initialize(cfg: ComponentConfiguration): Promise<void>;\n\n  clearPersistence(databaseId: DatabaseInfo): Promise<void>;\n}\n\n/**\n * Provides all components needed for Firestore with in-memory persistence.\n * Uses EagerGC garbage collection.\n */\nexport class MemoryComponentProvider implements ComponentProvider {\n  persistence!: Persistence;\n  sharedClientState!: SharedClientState;\n  localStore!: LocalStore;\n  syncEngine!: SyncEngine;\n  gcScheduler!: GarbageCollectionScheduler | null;\n  remoteStore!: RemoteStore;\n  eventManager!: EventManager;\n\n  async initialize(cfg: ComponentConfiguration): Promise<void> {\n    this.sharedClientState = this.createSharedClientState(cfg);\n    this.persistence = this.createPersistence(cfg);\n    await this.persistence.start();\n    this.gcScheduler = this.createGarbageCollectionScheduler(cfg);\n    this.localStore = this.createLocalStore(cfg);\n    this.remoteStore = this.createRemoteStore(cfg);\n    this.syncEngine = this.createSyncEngine(cfg);\n    this.eventManager = this.createEventManager(cfg);\n\n    this.sharedClientState.onlineStateHandler = onlineState =>\n      this.syncEngine.applyOnlineStateChange(\n        onlineState,\n        OnlineStateSource.SharedClientState\n      );\n    this.remoteStore.syncEngine = this.syncEngine;\n\n    await this.localStore.start();\n    await this.sharedClientState.start();\n    await this.remoteStore.start();\n\n    await this.remoteStore.applyPrimaryState(this.syncEngine.isPrimaryClient);\n  }\n\n  createEventManager(cfg: ComponentConfiguration): EventManager {\n    return new EventManager(this.syncEngine);\n  }\n\n  createGarbageCollectionScheduler(\n    cfg: ComponentConfiguration\n  ): GarbageCollectionScheduler | null {\n    return null;\n  }\n\n  createLocalStore(cfg: ComponentConfiguration): LocalStore {\n    return new LocalStore(\n      this.persistence,\n      new IndexFreeQueryEngine(),\n      cfg.initialUser\n    );\n  }\n\n  createPersistence(cfg: ComponentConfiguration): Persistence {\n    debugAssert(\n      !cfg.persistenceSettings.durable,\n      'Can only start memory persistence'\n    );\n    return new MemoryPersistence(MemoryEagerDelegate.factory);\n  }\n\n  createRemoteStore(cfg: ComponentConfiguration): RemoteStore {\n    return new RemoteStore(\n      this.localStore,\n      cfg.datastore,\n      cfg.asyncQueue,\n      onlineState =>\n        this.syncEngine.applyOnlineStateChange(\n          onlineState,\n          OnlineStateSource.RemoteStore\n        ),\n      cfg.platform.newConnectivityMonitor()\n    );\n  }\n\n  createSharedClientState(cfg: ComponentConfiguration): SharedClientState {\n    return new MemorySharedClientState();\n  }\n\n  createSyncEngine(cfg: ComponentConfiguration): SyncEngine {\n    return new SyncEngine(\n      this.localStore,\n      this.remoteStore,\n      this.sharedClientState,\n      cfg.initialUser,\n      cfg.maxConcurrentLimboResolutions\n    );\n  }\n\n  clearPersistence(databaseInfo: DatabaseInfo): Promise<void> {\n    throw new FirestoreError(\n      Code.FAILED_PRECONDITION,\n      MEMORY_ONLY_PERSISTENCE_ERROR_MESSAGE\n    );\n  }\n}\n\n/**\n * Provides all components needed for Firestore with IndexedDB persistence.\n */\nexport class IndexedDbComponentProvider extends MemoryComponentProvider {\n  persistence!: IndexedDbPersistence;\n\n  // TODO(tree-shaking): Create an IndexedDbComponentProvider and a\n  // MultiTabComponentProvider. The IndexedDbComponentProvider should depend\n  // on LocalStore and SyncEngine.\n  localStore!: MultiTabLocalStore;\n  syncEngine!: MultiTabSyncEngine;\n\n  async initialize(cfg: ComponentConfiguration): Promise<void> {\n    await super.initialize(cfg);\n\n    // NOTE: This will immediately call the listener, so we make sure to\n    // set it after localStore / remoteStore are started.\n    await this.persistence.setPrimaryStateListener(async isPrimary => {\n      await (this.syncEngine as MultiTabSyncEngine).applyPrimaryState(\n        isPrimary\n      );\n      if (this.gcScheduler) {\n        if (isPrimary && !this.gcScheduler.started) {\n          this.gcScheduler.start(this.localStore);\n        } else if (!isPrimary) {\n          this.gcScheduler.stop();\n        }\n      }\n    });\n  }\n\n  createLocalStore(cfg: ComponentConfiguration): LocalStore {\n    return new MultiTabLocalStore(\n      this.persistence,\n      new IndexFreeQueryEngine(),\n      cfg.initialUser\n    );\n  }\n\n  createSyncEngine(cfg: ComponentConfiguration): SyncEngine {\n    const syncEngine = new MultiTabSyncEngine(\n      this.localStore,\n      this.remoteStore,\n      this.sharedClientState,\n      cfg.initialUser,\n      cfg.maxConcurrentLimboResolutions\n    );\n    if (this.sharedClientState instanceof WebStorageSharedClientState) {\n      this.sharedClientState.syncEngine = syncEngine;\n    }\n    return syncEngine;\n  }\n\n  createGarbageCollectionScheduler(\n    cfg: ComponentConfiguration\n  ): GarbageCollectionScheduler | null {\n    const garbageCollector = this.persistence.referenceDelegate\n      .garbageCollector;\n    return new LruScheduler(garbageCollector, cfg.asyncQueue);\n  }\n\n  createPersistence(cfg: ComponentConfiguration): Persistence {\n    debugAssert(\n      cfg.persistenceSettings.durable,\n      'Can only start durable persistence'\n    );\n\n    const persistenceKey = IndexedDbPersistence.buildStoragePrefix(\n      cfg.databaseInfo\n    );\n    const serializer = cfg.platform.newSerializer(cfg.databaseInfo.databaseId);\n    return new IndexedDbPersistence(\n      cfg.persistenceSettings.synchronizeTabs,\n      persistenceKey,\n      cfg.clientId,\n      cfg.platform,\n      LruParams.withCacheSize(cfg.persistenceSettings.cacheSizeBytes),\n      cfg.asyncQueue,\n      serializer,\n      this.sharedClientState\n    );\n  }\n\n  createSharedClientState(cfg: ComponentConfiguration): SharedClientState {\n    if (\n      cfg.persistenceSettings.durable &&\n      cfg.persistenceSettings.synchronizeTabs\n    ) {\n      if (!WebStorageSharedClientState.isAvailable(cfg.platform)) {\n        throw new FirestoreError(\n          Code.UNIMPLEMENTED,\n          'IndexedDB persistence is only available on platforms that support LocalStorage.'\n        );\n      }\n      const persistenceKey = IndexedDbPersistence.buildStoragePrefix(\n        cfg.databaseInfo\n      );\n      return new WebStorageSharedClientState(\n        cfg.asyncQueue,\n        cfg.platform,\n        persistenceKey,\n        cfg.clientId,\n        cfg.initialUser\n      );\n    }\n    return new MemorySharedClientState();\n  }\n\n  clearPersistence(databaseInfo: DatabaseInfo): Promise<void> {\n    const persistenceKey = IndexedDbPersistence.buildStoragePrefix(\n      databaseInfo\n    );\n    return IndexedDbPersistence.clearPersistence(persistenceKey);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { CredentialsProvider } from '../api/credentials';\nimport { User } from '../auth/user';\nimport { LocalStore } from '../local/local_store';\nimport { GarbageCollectionScheduler, Persistence } from '../local/persistence';\nimport { Document, NoDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { Mutation } from '../model/mutation';\nimport { Platform } from '../platform/platform';\nimport { newDatastore } from '../remote/datastore';\nimport { RemoteStore } from '../remote/remote_store';\nimport { AsyncQueue, wrapInUserErrorIfRecoverable } from '../util/async_queue';\nimport { Code, FirestoreError } from '../util/error';\nimport { logDebug } from '../util/log';\nimport { Deferred } from '../util/promise';\nimport {\n  EventManager,\n  ListenOptions,\n  Observer,\n  QueryListener\n} from './event_manager';\nimport { SyncEngine } from './sync_engine';\nimport { View } from './view';\n\nimport { SharedClientState } from '../local/shared_client_state';\nimport { AutoId } from '../util/misc';\nimport { DatabaseId, DatabaseInfo } from './database_info';\nimport { Query } from './query';\nimport { Transaction } from './transaction';\nimport { ViewSnapshot } from './view_snapshot';\nimport {\n  ComponentProvider,\n  MemoryComponentProvider\n} from './component_provider';\n\nconst LOG_TAG = 'FirestoreClient';\nconst MAX_CONCURRENT_LIMBO_RESOLUTIONS = 100;\n\n/** DOMException error code constants. */\nconst DOM_EXCEPTION_INVALID_STATE = 11;\nconst DOM_EXCEPTION_ABORTED = 20;\nconst DOM_EXCEPTION_QUOTA_EXCEEDED = 22;\n\nexport type PersistenceSettings =\n  | {\n      readonly durable: false;\n    }\n  | {\n      readonly durable: true;\n      readonly cacheSizeBytes: number;\n      readonly synchronizeTabs: boolean;\n    };\n\n/**\n * FirestoreClient is a top-level class that constructs and owns all of the\n * pieces of the client SDK architecture. It is responsible for creating the\n * async queue that is shared by all of the other components in the system.\n */\nexport class FirestoreClient {\n  // NOTE: These should technically have '|undefined' in the types, since\n  // they're initialized asynchronously rather than in the constructor, but\n  // given that all work is done on the async queue and we assert that\n  // initialization completes before any other work is queued, we're cheating\n  // with the types rather than littering the code with '!' or unnecessary\n  // undefined checks.\n  private eventMgr!: EventManager;\n  private persistence!: Persistence;\n  private localStore!: LocalStore;\n  private remoteStore!: RemoteStore;\n  private syncEngine!: SyncEngine;\n  private gcScheduler!: GarbageCollectionScheduler | null;\n\n  // PORTING NOTE: SharedClientState is only used for multi-tab web.\n  private sharedClientState!: SharedClientState;\n\n  private readonly clientId = AutoId.newId();\n\n  constructor(\n    private platform: Platform,\n    private databaseInfo: DatabaseInfo,\n    private credentials: CredentialsProvider,\n    /**\n     * Asynchronous queue responsible for all of our internal processing. When\n     * we get incoming work from the user (via public API) or the network\n     * (incoming GRPC messages), we should always schedule onto this queue.\n     * This ensures all of our work is properly serialized (e.g. we don't\n     * start processing a new operation while the previous one is waiting for\n     * an async I/O to complete).\n     */\n    private asyncQueue: AsyncQueue\n  ) {}\n\n  /**\n   * Starts up the FirestoreClient, returning only whether or not enabling\n   * persistence succeeded.\n   *\n   * The intent here is to \"do the right thing\" as far as users are concerned.\n   * Namely, in cases where offline persistence is requested and possible,\n   * enable it, but otherwise fall back to persistence disabled. For the most\n   * part we expect this to succeed one way or the other so we don't expect our\n   * users to actually wait on the firestore.enablePersistence Promise since\n   * they generally won't care.\n   *\n   * Of course some users actually do care about whether or not persistence\n   * was successfully enabled, so the Promise returned from this method\n   * indicates this outcome.\n   *\n   * This presents a problem though: even before enablePersistence resolves or\n   * rejects, users may have made calls to e.g. firestore.collection() which\n   * means that the FirestoreClient in there will be available and will be\n   * enqueuing actions on the async queue.\n   *\n   * Meanwhile any failure of an operation on the async queue causes it to\n   * panic and reject any further work, on the premise that unhandled errors\n   * are fatal.\n   *\n   * Consequently the fallback is handled internally here in start, and if the\n   * fallback succeeds we signal success to the async queue even though the\n   * start() itself signals failure.\n   *\n   * @param componentProvider Provider that returns all core components.\n   * @param persistenceSettings Settings object to configure offline\n   *     persistence.\n   * @returns A deferred result indicating the user-visible result of enabling\n   *     offline persistence. This method will reject this if IndexedDB fails to\n   *     start for any reason. If usePersistence is false this is\n   *     unconditionally resolved.\n   */\n  start(\n    componentProvider: ComponentProvider,\n    persistenceSettings: PersistenceSettings\n  ): Promise<void> {\n    this.verifyNotTerminated();\n    // We defer our initialization until we get the current user from\n    // setChangeListener(). We block the async queue until we got the initial\n    // user and the initialization is completed. This will prevent any scheduled\n    // work from happening before initialization is completed.\n    //\n    // If initializationDone resolved then the FirestoreClient is in a usable\n    // state.\n    const initializationDone = new Deferred<void>();\n\n    // If usePersistence is true, certain classes of errors while starting are\n    // recoverable but only by falling back to persistence disabled.\n    //\n    // If there's an error in the first case but not in recovery we cannot\n    // reject the promise blocking the async queue because this will cause the\n    // async queue to panic.\n    const persistenceResult = new Deferred<void>();\n\n    let initialized = false;\n    this.credentials.setChangeListener(user => {\n      if (!initialized) {\n        initialized = true;\n\n        logDebug(LOG_TAG, 'Initializing. user=', user.uid);\n\n        return this.initializeComponents(\n          componentProvider,\n          persistenceSettings,\n          user,\n          persistenceResult\n        ).then(initializationDone.resolve, initializationDone.reject);\n      } else {\n        this.asyncQueue.enqueueRetryable(() => {\n          return this.handleCredentialChange(user);\n        });\n      }\n    });\n\n    // Block the async queue until initialization is done\n    this.asyncQueue.enqueueAndForget(() => {\n      return initializationDone.promise;\n    });\n\n    // Return only the result of enabling persistence. Note that this does not\n    // need to await the completion of initializationDone because the result of\n    // this method should not reflect any other kind of failure to start.\n    return persistenceResult.promise;\n  }\n\n  /** Enables the network connection and requeues all pending operations. */\n  enableNetwork(): Promise<void> {\n    this.verifyNotTerminated();\n    return this.asyncQueue.enqueue(() => {\n      return this.syncEngine.enableNetwork();\n    });\n  }\n\n  /**\n   * Initializes persistent storage, attempting to use IndexedDB if\n   * usePersistence is true or memory-only if false.\n   *\n   * If IndexedDB fails because it's already open in another tab or because the\n   * platform can't possibly support our implementation then this method rejects\n   * the persistenceResult and falls back on memory-only persistence.\n   *\n   * @param componentProvider The provider that provides all core componennts\n   *     for IndexedDB or memory-backed persistence\n   * @param persistenceSettings Settings object to configure offline persistence\n   * @param user The initial user\n   * @param persistenceResult A deferred result indicating the user-visible\n   *     result of enabling offline persistence. This method will reject this if\n   *     IndexedDB fails to start for any reason. If usePersistence is false\n   *     this is unconditionally resolved.\n   * @returns a Promise indicating whether or not initialization should\n   *     continue, i.e. that one of the persistence implementations actually\n   *     succeeded.\n   */\n  private async initializeComponents(\n    componentProvider: ComponentProvider,\n    persistenceSettings: PersistenceSettings,\n    user: User,\n    persistenceResult: Deferred<void>\n  ): Promise<void> {\n    try {\n      // TODO(mrschmidt): Ideally, ComponentProvider would also initialize\n      // Datastore (without duplicating the initializing logic once per\n      // provider).\n\n      const connection = await this.platform.loadConnection(this.databaseInfo);\n      const serializer = this.platform.newSerializer(\n        this.databaseInfo.databaseId\n      );\n      const datastore = newDatastore(connection, this.credentials, serializer);\n\n      await componentProvider.initialize({\n        asyncQueue: this.asyncQueue,\n        databaseInfo: this.databaseInfo,\n        platform: this.platform,\n        datastore,\n        clientId: this.clientId,\n        initialUser: user,\n        maxConcurrentLimboResolutions: MAX_CONCURRENT_LIMBO_RESOLUTIONS,\n        persistenceSettings\n      });\n\n      this.persistence = componentProvider.persistence;\n      this.sharedClientState = componentProvider.sharedClientState;\n      this.localStore = componentProvider.localStore;\n      this.remoteStore = componentProvider.remoteStore;\n      this.syncEngine = componentProvider.syncEngine;\n      this.gcScheduler = componentProvider.gcScheduler;\n      this.eventMgr = componentProvider.eventManager;\n\n      // When a user calls clearPersistence() in one client, all other clients\n      // need to be terminated to allow the delete to succeed.\n      this.persistence.setDatabaseDeletedListener(async () => {\n        await this.terminate();\n      });\n\n      persistenceResult.resolve();\n    } catch (error) {\n      // Regardless of whether or not the retry succeeds, from an user\n      // perspective, offline persistence has failed.\n      persistenceResult.reject(error);\n\n      // An unknown failure on the first stage shuts everything down.\n      if (!this.canFallback(error)) {\n        throw error;\n      }\n      console.warn(\n        'Error enabling offline persistence. Falling back to' +\n          ' persistence disabled: ' +\n          error\n      );\n      return this.initializeComponents(\n        new MemoryComponentProvider(),\n        { durable: false },\n        user,\n        persistenceResult\n      );\n    }\n  }\n\n  /**\n   * Decides whether the provided error allows us to gracefully disable\n   * persistence (as opposed to crashing the client).\n   */\n  private canFallback(error: FirestoreError | DOMException): boolean {\n    if (error.name === 'FirebaseError') {\n      return (\n        error.code === Code.FAILED_PRECONDITION ||\n        error.code === Code.UNIMPLEMENTED\n      );\n    } else if (\n      typeof DOMException !== 'undefined' &&\n      error instanceof DOMException\n    ) {\n      // There are a few known circumstances where we can open IndexedDb but\n      // trying to read/write will fail (e.g. quota exceeded). For\n      // well-understood cases, we attempt to detect these and then gracefully\n      // fall back to memory persistence.\n      // NOTE: Rather than continue to add to this list, we could decide to\n      // always fall back, with the risk that we might accidentally hide errors\n      // representing actual SDK bugs.\n      return (\n        // When the browser is out of quota we could get either quota exceeded\n        // or an aborted error depending on whether the error happened during\n        // schema migration.\n        error.code === DOM_EXCEPTION_QUOTA_EXCEEDED ||\n        error.code === DOM_EXCEPTION_ABORTED ||\n        // Firefox Private Browsing mode disables IndexedDb and returns\n        // INVALID_STATE for any usage.\n        error.code === DOM_EXCEPTION_INVALID_STATE\n      );\n    }\n\n    return true;\n  }\n\n  /**\n   * Checks that the client has not been terminated. Ensures that other methods on\n   * this class cannot be called after the client is terminated.\n   */\n  private verifyNotTerminated(): void {\n    if (this.asyncQueue.isShuttingDown) {\n      throw new FirestoreError(\n        Code.FAILED_PRECONDITION,\n        'The client has already been terminated.'\n      );\n    }\n  }\n\n  private handleCredentialChange(user: User): Promise<void> {\n    this.asyncQueue.verifyOperationInProgress();\n\n    logDebug(LOG_TAG, 'Credential Changed. Current user: ' + user.uid);\n    return this.syncEngine.handleCredentialChange(user);\n  }\n\n  /** Disables the network connection. Pending operations will not complete. */\n  disableNetwork(): Promise<void> {\n    this.verifyNotTerminated();\n    return this.asyncQueue.enqueue(() => {\n      return this.syncEngine.disableNetwork();\n    });\n  }\n\n  terminate(): Promise<void> {\n    return this.asyncQueue.enqueueAndInitiateShutdown(async () => {\n      // PORTING NOTE: LocalStore does not need an explicit shutdown on web.\n      if (this.gcScheduler) {\n        this.gcScheduler.stop();\n      }\n\n      await this.remoteStore.shutdown();\n      await this.sharedClientState.shutdown();\n      await this.persistence.shutdown();\n\n      // `removeChangeListener` must be called after shutting down the\n      // RemoteStore as it will prevent the RemoteStore from retrieving\n      // auth tokens.\n      this.credentials.removeChangeListener();\n    });\n  }\n\n  /**\n   * Returns a Promise that resolves when all writes that were pending at the time this\n   * method was called received server acknowledgement. An acknowledgement can be either acceptance\n   * or rejection.\n   */\n  waitForPendingWrites(): Promise<void> {\n    this.verifyNotTerminated();\n\n    const deferred = new Deferred<void>();\n    this.asyncQueue.enqueueAndForget(() => {\n      return this.syncEngine.registerPendingWritesCallback(deferred);\n    });\n    return deferred.promise;\n  }\n\n  listen(\n    query: Query,\n    observer: Observer<ViewSnapshot>,\n    options: ListenOptions\n  ): QueryListener {\n    this.verifyNotTerminated();\n    const listener = new QueryListener(query, observer, options);\n    this.asyncQueue.enqueueAndForget(() => this.eventMgr.listen(listener));\n    return listener;\n  }\n\n  unlisten(listener: QueryListener): void {\n    // Checks for termination but does not raise error, allowing unlisten after\n    // termination to be a no-op.\n    if (this.clientTerminated) {\n      return;\n    }\n    this.asyncQueue.enqueueAndForget(() => {\n      return this.eventMgr.unlisten(listener);\n    });\n  }\n\n  async getDocumentFromLocalCache(\n    docKey: DocumentKey\n  ): Promise<Document | null> {\n    this.verifyNotTerminated();\n    const deferred = new Deferred<Document | null>();\n    await this.asyncQueue.enqueue(async () => {\n      try {\n        const maybeDoc = await this.localStore.readDocument(docKey);\n        if (maybeDoc instanceof Document) {\n          deferred.resolve(maybeDoc);\n        } else if (maybeDoc instanceof NoDocument) {\n          deferred.resolve(null);\n        } else {\n          deferred.reject(\n            new FirestoreError(\n              Code.UNAVAILABLE,\n              'Failed to get document from cache. (However, this document may ' +\n                \"exist on the server. Run again without setting 'source' in \" +\n                'the GetOptions to attempt to retrieve the document from the ' +\n                'server.)'\n            )\n          );\n        }\n      } catch (e) {\n        const firestoreError = wrapInUserErrorIfRecoverable(\n          e,\n          `Failed to get document '${docKey} from cache`\n        );\n        deferred.reject(firestoreError);\n      }\n    });\n\n    return deferred.promise;\n  }\n\n  async getDocumentsFromLocalCache(query: Query): Promise<ViewSnapshot> {\n    this.verifyNotTerminated();\n    const deferred = new Deferred<ViewSnapshot>();\n    await this.asyncQueue.enqueue(async () => {\n      try {\n        const queryResult = await this.localStore.executeQuery(\n          query,\n          /* usePreviousResults= */ true\n        );\n        const view = new View(query, queryResult.remoteKeys);\n        const viewDocChanges = view.computeDocChanges(queryResult.documents);\n        const viewChange = view.applyChanges(\n          viewDocChanges,\n          /* updateLimboDocuments= */ false\n        );\n        deferred.resolve(viewChange.snapshot!);\n      } catch (e) {\n        const firestoreError = wrapInUserErrorIfRecoverable(\n          e,\n          `Failed to execute query '${query} against cache`\n        );\n        deferred.reject(firestoreError);\n      }\n    });\n    return deferred.promise;\n  }\n\n  write(mutations: Mutation[]): Promise<void> {\n    this.verifyNotTerminated();\n    const deferred = new Deferred<void>();\n    this.asyncQueue.enqueueAndForget(() =>\n      this.syncEngine.write(mutations, deferred)\n    );\n    return deferred.promise;\n  }\n\n  databaseId(): DatabaseId {\n    return this.databaseInfo.databaseId;\n  }\n\n  addSnapshotsInSyncListener(observer: Observer<void>): void {\n    this.verifyNotTerminated();\n    this.asyncQueue.enqueueAndForget(() => {\n      this.eventMgr.addSnapshotsInSyncListener(observer);\n      return Promise.resolve();\n    });\n  }\n\n  removeSnapshotsInSyncListener(observer: Observer<void>): void {\n    // Checks for shutdown but does not raise error, allowing remove after\n    // shutdown to be a no-op.\n    if (this.clientTerminated) {\n      return;\n    }\n    this.asyncQueue.enqueueAndForget(() => {\n      this.eventMgr.removeSnapshotsInSyncListener(observer);\n      return Promise.resolve();\n    });\n  }\n\n  get clientTerminated(): boolean {\n    // Technically, the asyncQueue is still running, but only accepting operations\n    // related to termination or supposed to be run after termination. It is effectively\n    // terminated to the eyes of users.\n    return this.asyncQueue.isShuttingDown;\n  }\n\n  transaction<T>(\n    updateFunction: (transaction: Transaction) => Promise<T>\n  ): Promise<T> {\n    this.verifyNotTerminated();\n    const deferred = new Deferred<T>();\n    this.asyncQueue.enqueueAndForget(() => {\n      this.syncEngine.runTransaction(this.asyncQueue, updateFunction, deferred);\n      return Promise.resolve();\n    });\n    return deferred.promise;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Observer } from '../core/event_manager';\nimport { EventHandler } from './misc';\n\n/*\n * A wrapper implementation of Observer<T> that will dispatch events\n * asynchronously. To allow immediate silencing, a mute call is added which\n * causes events scheduled to no longer be raised.\n */\nexport class AsyncObserver<T> implements Observer<T> {\n  /**\n   * When set to true, will not raise future events. Necessary to deal with\n   * async detachment of listener.\n   */\n  private muted = false;\n\n  constructor(private observer: Observer<T>) {}\n\n  next(value: T): void {\n    this.scheduleEvent(this.observer.next, value);\n  }\n\n  error(error: Error): void {\n    this.scheduleEvent(this.observer.error, error);\n  }\n\n  mute(): void {\n    this.muted = true;\n  }\n\n  private scheduleEvent<E>(eventHandler: EventHandler<E>, event: E): void {\n    if (!this.muted) {\n      setTimeout(() => {\n        if (!this.muted) {\n          eventHandler(event);\n        }\n      }, 0);\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { JsonObject } from '../model/object_value';\n\n/**\n * Observer/Subscribe interfaces.\n */\nexport type NextFn<T> = (value: T) => void;\nexport type ErrorFn = (error: Error) => void;\nexport type CompleteFn = () => void;\n\n// Allow for any of the Observer methods to be undefined.\nexport interface PartialObserver<T> {\n  next?: NextFn<T>;\n  error?: ErrorFn;\n  complete?: CompleteFn;\n}\n\nexport interface Unsubscribe {\n  (): void;\n}\n\nexport function isPartialObserver(obj: unknown): boolean {\n  return implementsAnyMethods(obj, ['next', 'error', 'complete']);\n}\n\n/**\n * Returns true if obj is an object and contains at least one of the specified\n * methods.\n */\nfunction implementsAnyMethods(obj: unknown, methods: string[]): boolean {\n  if (typeof obj !== 'object' || obj === null) {\n    return false;\n  }\n\n  const object = obj as JsonObject<unknown>;\n  for (const method of methods) {\n    if (method in object && typeof object[method] === 'function') {\n      return true;\n    }\n  }\n  return false;\n}\n","/**\n * @license\n * Copyright 2020 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as firestore from '@firebase/firestore-types';\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { DocumentReference, Firestore } from './database';\nimport { Blob } from './blob';\nimport { GeoPoint } from './geo_point';\nimport { Timestamp } from './timestamp';\nimport { DatabaseId } from '../core/database_info';\nimport { DocumentKey } from '../model/document_key';\nimport {\n  normalizeByteString,\n  normalizeNumber,\n  normalizeTimestamp,\n  typeOrder\n} from '../model/values';\nimport {\n  getLocalWriteTime,\n  getPreviousValue\n} from '../model/server_timestamps';\nimport { fail, hardAssert } from '../util/assert';\nimport { forEach } from '../util/obj';\nimport { TypeOrder } from '../model/object_value';\nimport { ResourcePath } from '../model/path';\nimport { isValidResourceName } from '../remote/serializer';\nimport { logError } from '../util/log';\n\nexport type ServerTimestampBehavior = 'estimate' | 'previous' | 'none';\n\n/**\n * Converts Firestore's internal types to the JavaScript types that we expose\n * to the user.\n */\nexport class UserDataWriter<T = firestore.DocumentData> {\n  constructor(\n    private readonly firestore: Firestore,\n    private readonly timestampsInSnapshots: boolean,\n    private readonly serverTimestampBehavior?: ServerTimestampBehavior,\n    private readonly converter?: firestore.FirestoreDataConverter<T>\n  ) {}\n\n  convertValue(value: api.Value): unknown {\n    switch (typeOrder(value)) {\n      case TypeOrder.NullValue:\n        return null;\n      case TypeOrder.BooleanValue:\n        return value.booleanValue!;\n      case TypeOrder.NumberValue:\n        return normalizeNumber(value.integerValue || value.doubleValue);\n      case TypeOrder.TimestampValue:\n        return this.convertTimestamp(value.timestampValue!);\n      case TypeOrder.ServerTimestampValue:\n        return this.convertServerTimestamp(value);\n      case TypeOrder.StringValue:\n        return value.stringValue!;\n      case TypeOrder.BlobValue:\n        return new Blob(normalizeByteString(value.bytesValue!));\n      case TypeOrder.RefValue:\n        return this.convertReference(value.referenceValue!);\n      case TypeOrder.GeoPointValue:\n        return this.convertGeoPoint(value.geoPointValue!);\n      case TypeOrder.ArrayValue:\n        return this.convertArray(value.arrayValue!);\n      case TypeOrder.ObjectValue:\n        return this.convertObject(value.mapValue!);\n      default:\n        throw fail('Invalid value type: ' + JSON.stringify(value));\n    }\n  }\n\n  private convertObject(mapValue: api.MapValue): firestore.DocumentData {\n    const result: firestore.DocumentData = {};\n    forEach(mapValue.fields || {}, (key, value) => {\n      result[key] = this.convertValue(value);\n    });\n    return result;\n  }\n\n  private convertGeoPoint(value: api.LatLng): GeoPoint {\n    return new GeoPoint(\n      normalizeNumber(value.latitude),\n      normalizeNumber(value.longitude)\n    );\n  }\n\n  private convertArray(arrayValue: api.ArrayValue): unknown[] {\n    return (arrayValue.values || []).map(value => this.convertValue(value));\n  }\n\n  private convertServerTimestamp(value: api.Value): unknown {\n    switch (this.serverTimestampBehavior) {\n      case 'previous':\n        const previousValue = getPreviousValue(value);\n        if (previousValue == null) {\n          return null;\n        }\n        return this.convertValue(previousValue);\n      case 'estimate':\n        return this.convertTimestamp(getLocalWriteTime(value));\n      default:\n        return null;\n    }\n  }\n\n  private convertTimestamp(value: api.Timestamp): Timestamp | Date {\n    const normalizedValue = normalizeTimestamp(value);\n    const timestamp = new Timestamp(\n      normalizedValue.seconds,\n      normalizedValue.nanos\n    );\n    if (this.timestampsInSnapshots) {\n      return timestamp;\n    } else {\n      return timestamp.toDate();\n    }\n  }\n\n  private convertReference(name: string): DocumentReference<T> {\n    const resourcePath = ResourcePath.fromString(name);\n    hardAssert(\n      isValidResourceName(resourcePath),\n      'ReferenceValue is not valid ' + name\n    );\n    const databaseId = new DatabaseId(resourcePath.get(1), resourcePath.get(3));\n    const key = new DocumentKey(resourcePath.popFirst(5));\n\n    if (!databaseId.isEqual(this.firestore._databaseId)) {\n      // TODO(b/64130202): Somehow support foreign references.\n      logError(\n        `Document ${key} contains a document ` +\n          `reference within a different database (` +\n          `${databaseId.projectId}/${databaseId.database}) which is not ` +\n          `supported. It will be treated as a reference in the current ` +\n          `database (${this.firestore._databaseId.projectId}/${this.firestore._databaseId.database}) ` +\n          `instead.`\n      );\n    }\n\n    return new DocumentReference(key, this.firestore, this.converter);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport * as firestore from '@firebase/firestore-types';\n\nimport * as api from '../protos/firestore_proto_api';\n\nimport { FirebaseApp } from '@firebase/app-types';\nimport { _FirebaseApp, FirebaseService } from '@firebase/app-types/private';\nimport { DatabaseId, DatabaseInfo } from '../core/database_info';\nimport { ListenOptions } from '../core/event_manager';\nimport {\n  ComponentProvider,\n  MemoryComponentProvider\n} from '../core/component_provider';\nimport { FirestoreClient, PersistenceSettings } from '../core/firestore_client';\nimport {\n  Bound,\n  Direction,\n  FieldFilter,\n  Filter,\n  Operator,\n  OrderBy,\n  Query as InternalQuery\n} from '../core/query';\nimport { Transaction as InternalTransaction } from '../core/transaction';\nimport { ChangeType, ViewSnapshot } from '../core/view_snapshot';\nimport { LruParams } from '../local/lru_garbage_collector';\nimport { Document, MaybeDocument, NoDocument } from '../model/document';\nimport { DocumentKey } from '../model/document_key';\nimport { DeleteMutation, Mutation, Precondition } from '../model/mutation';\nimport { FieldPath, ResourcePath } from '../model/path';\nimport { isServerTimestamp } from '../model/server_timestamps';\nimport { refValue } from '../model/values';\nimport { PlatformSupport } from '../platform/platform';\nimport { debugAssert, fail } from '../util/assert';\nimport { AsyncObserver } from '../util/async_observer';\nimport { AsyncQueue } from '../util/async_queue';\nimport { Code, FirestoreError } from '../util/error';\nimport {\n  invalidClassError,\n  validateArgType,\n  validateAtLeastNumberOfArgs,\n  validateBetweenNumberOfArgs,\n  validateDefined,\n  validateExactNumberOfArgs,\n  validateNamedOptionalPropertyEquals,\n  validateNamedOptionalType,\n  validateNamedType,\n  validateOptionalArgType,\n  validateOptionalArrayElements,\n  validateOptionNames,\n  validatePositiveNumber,\n  validateStringEnum,\n  valueDescription\n} from '../util/input_validation';\nimport { getLogLevel, logError, LogLevel, setLogLevel } from '../util/log';\nimport { AutoId } from '../util/misc';\nimport { Deferred, Rejecter, Resolver } from '../util/promise';\nimport { FieldPath as ExternalFieldPath } from './field_path';\n\nimport {\n  CredentialsProvider,\n  CredentialsSettings,\n  EmptyCredentialsProvider,\n  FirebaseCredentialsProvider,\n  makeCredentialsProvider\n} from './credentials';\nimport {\n  CompleteFn,\n  ErrorFn,\n  isPartialObserver,\n  NextFn,\n  PartialObserver,\n  Unsubscribe\n} from './observer';\nimport { fieldPathFromArgument, UserDataReader } from './user_data_reader';\nimport { UserDataWriter } from './user_data_writer';\nimport { FirebaseAuthInternalName } from '@firebase/auth-interop-types';\nimport { Provider } from '@firebase/component';\n\n// settings() defaults:\nconst DEFAULT_HOST = 'firestore.googleapis.com';\nconst DEFAULT_SSL = true;\nconst DEFAULT_TIMESTAMPS_IN_SNAPSHOTS = true;\nconst DEFAULT_FORCE_LONG_POLLING = false;\nconst DEFAULT_IGNORE_UNDEFINED_PROPERTIES = false;\n\n/**\n * Constant used to indicate the LRU garbage collection should be disabled.\n * Set this value as the `cacheSizeBytes` on the settings passed to the\n * `Firestore` instance.\n */\nexport const CACHE_SIZE_UNLIMITED = LruParams.COLLECTION_DISABLED;\n\n// enablePersistence() defaults:\nconst DEFAULT_SYNCHRONIZE_TABS = false;\n\n/** Undocumented, private additional settings not exposed in our public API. */\ninterface PrivateSettings extends firestore.Settings {\n  // Can be a google-auth-library or gapi client.\n  credentials?: CredentialsSettings;\n}\n\n/**\n * Options that can be provided in the Firestore constructor when not using\n * Firebase (aka standalone mode).\n */\nexport interface FirestoreDatabase {\n  projectId: string;\n  database?: string;\n}\n\n/**\n * A concrete type describing all the values that can be applied via a\n * user-supplied firestore.Settings object. This is a separate type so that\n * defaults can be supplied and the value can be checked for equality.\n */\nclass FirestoreSettings {\n  /** The hostname to connect to. */\n  readonly host: string;\n\n  /** Whether to use SSL when connecting. */\n  readonly ssl: boolean;\n\n  readonly timestampsInSnapshots: boolean;\n\n  readonly cacheSizeBytes: number;\n\n  readonly forceLongPolling: boolean;\n\n  readonly ignoreUndefinedProperties: boolean;\n\n  // Can be a google-auth-library or gapi client.\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  credentials?: any;\n\n  constructor(settings: PrivateSettings) {\n    if (settings.host === undefined) {\n      if (settings.ssl !== undefined) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          \"Can't provide ssl option if host option is not set\"\n        );\n      }\n      this.host = DEFAULT_HOST;\n      this.ssl = DEFAULT_SSL;\n    } else {\n      validateNamedType('settings', 'non-empty string', 'host', settings.host);\n      this.host = settings.host;\n\n      validateNamedOptionalType('settings', 'boolean', 'ssl', settings.ssl);\n      this.ssl = settings.ssl ?? DEFAULT_SSL;\n    }\n    validateOptionNames('settings', settings, [\n      'host',\n      'ssl',\n      'credentials',\n      'timestampsInSnapshots',\n      'cacheSizeBytes',\n      'experimentalForceLongPolling',\n      'ignoreUndefinedProperties'\n    ]);\n\n    validateNamedOptionalType(\n      'settings',\n      'object',\n      'credentials',\n      settings.credentials\n    );\n    this.credentials = settings.credentials;\n\n    validateNamedOptionalType(\n      'settings',\n      'boolean',\n      'timestampsInSnapshots',\n      settings.timestampsInSnapshots\n    );\n\n    validateNamedOptionalType(\n      'settings',\n      'boolean',\n      'ignoreUndefinedProperties',\n      settings.ignoreUndefinedProperties\n    );\n\n    // Nobody should set timestampsInSnapshots anymore, but the error depends on\n    // whether they set it to true or false...\n    if (settings.timestampsInSnapshots === true) {\n      logError(\n        \"The setting 'timestampsInSnapshots: true' is no longer required \" +\n          'and should be removed.'\n      );\n    } else if (settings.timestampsInSnapshots === false) {\n      logError(\n        \"Support for 'timestampsInSnapshots: false' will be removed soon. \" +\n          'You must update your code to handle Timestamp objects.'\n      );\n    }\n    this.timestampsInSnapshots =\n      settings.timestampsInSnapshots ?? DEFAULT_TIMESTAMPS_IN_SNAPSHOTS;\n    this.ignoreUndefinedProperties =\n      settings.ignoreUndefinedProperties ?? DEFAULT_IGNORE_UNDEFINED_PROPERTIES;\n\n    validateNamedOptionalType(\n      'settings',\n      'number',\n      'cacheSizeBytes',\n      settings.cacheSizeBytes\n    );\n    if (settings.cacheSizeBytes === undefined) {\n      this.cacheSizeBytes = LruParams.DEFAULT_CACHE_SIZE_BYTES;\n    } else {\n      if (\n        settings.cacheSizeBytes !== CACHE_SIZE_UNLIMITED &&\n        settings.cacheSizeBytes < LruParams.MINIMUM_CACHE_SIZE_BYTES\n      ) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          `cacheSizeBytes must be at least ${LruParams.MINIMUM_CACHE_SIZE_BYTES}`\n        );\n      } else {\n        this.cacheSizeBytes = settings.cacheSizeBytes;\n      }\n    }\n\n    validateNamedOptionalType(\n      'settings',\n      'boolean',\n      'experimentalForceLongPolling',\n      settings.experimentalForceLongPolling\n    );\n    this.forceLongPolling =\n      settings.experimentalForceLongPolling ?? DEFAULT_FORCE_LONG_POLLING;\n  }\n\n  isEqual(other: FirestoreSettings): boolean {\n    return (\n      this.host === other.host &&\n      this.ssl === other.ssl &&\n      this.timestampsInSnapshots === other.timestampsInSnapshots &&\n      this.credentials === other.credentials &&\n      this.cacheSizeBytes === other.cacheSizeBytes &&\n      this.forceLongPolling === other.forceLongPolling &&\n      this.ignoreUndefinedProperties === other.ignoreUndefinedProperties\n    );\n  }\n}\n\n/**\n * The root reference to the database.\n */\nexport class Firestore implements firestore.FirebaseFirestore, FirebaseService {\n  // The objects that are a part of this API are exposed to third-parties as\n  // compiled javascript so we want to flag our private members with a leading\n  // underscore to discourage their use.\n  readonly _databaseId: DatabaseId;\n  private readonly _persistenceKey: string;\n  private readonly _componentProvider: ComponentProvider;\n  private _credentials: CredentialsProvider;\n  private readonly _firebaseApp: FirebaseApp | null = null;\n  private _settings: FirestoreSettings;\n\n  // The firestore client instance. This will be available as soon as\n  // configureClient is called, but any calls against it will block until\n  // setup has completed.\n  //\n  // Operations on the _firestoreClient don't block on _firestoreReady. Those\n  // are already set to synchronize on the async queue.\n  private _firestoreClient: FirestoreClient | undefined;\n\n  // Public for use in tests.\n  // TODO(mikelehen): Use modularized initialization instead.\n  readonly _queue = new AsyncQueue();\n\n  _userDataReader: UserDataReader | undefined;\n\n  // Note: We are using `MemoryComponentProvider` as a default\n  // ComponentProvider to ensure backwards compatibility with the format\n  // expected by the console build.\n  constructor(\n    databaseIdOrApp: FirestoreDatabase | FirebaseApp,\n    authProvider: Provider<FirebaseAuthInternalName>,\n    componentProvider: ComponentProvider = new MemoryComponentProvider()\n  ) {\n    if (typeof (databaseIdOrApp as FirebaseApp).options === 'object') {\n      // This is very likely a Firebase app object\n      // TODO(b/34177605): Can we somehow use instanceof?\n      const app = databaseIdOrApp as FirebaseApp;\n      this._firebaseApp = app;\n      this._databaseId = Firestore.databaseIdFromApp(app);\n      this._persistenceKey = app.name;\n      this._credentials = new FirebaseCredentialsProvider(authProvider);\n    } else {\n      const external = databaseIdOrApp as FirestoreDatabase;\n      if (!external.projectId) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          'Must provide projectId'\n        );\n      }\n\n      this._databaseId = new DatabaseId(external.projectId, external.database);\n      // Use a default persistenceKey that lines up with FirebaseApp.\n      this._persistenceKey = '[DEFAULT]';\n      this._credentials = new EmptyCredentialsProvider();\n    }\n\n    this._componentProvider = componentProvider;\n    this._settings = new FirestoreSettings({});\n  }\n\n  get _dataReader(): UserDataReader {\n    debugAssert(\n      !!this._firestoreClient,\n      'Cannot obtain UserDataReader before instance is intitialized'\n    );\n    if (!this._userDataReader) {\n      // Lazy initialize UserDataReader once the settings are frozen\n      this._userDataReader = new UserDataReader(\n        this._databaseId,\n        this._settings.ignoreUndefinedProperties\n      );\n    }\n    return this._userDataReader;\n  }\n\n  settings(settingsLiteral: firestore.Settings): void {\n    validateExactNumberOfArgs('Firestore.settings', arguments, 1);\n    validateArgType('Firestore.settings', 'object', 1, settingsLiteral);\n\n    const newSettings = new FirestoreSettings(settingsLiteral);\n    if (this._firestoreClient && !this._settings.isEqual(newSettings)) {\n      throw new FirestoreError(\n        Code.FAILED_PRECONDITION,\n        'Firestore has already been started and its settings can no longer ' +\n          'be changed. You can only call settings() before calling any other ' +\n          'methods on a Firestore object.'\n      );\n    }\n\n    this._settings = newSettings;\n    if (newSettings.credentials !== undefined) {\n      this._credentials = makeCredentialsProvider(newSettings.credentials);\n    }\n  }\n\n  enableNetwork(): Promise<void> {\n    this.ensureClientConfigured();\n    return this._firestoreClient!.enableNetwork();\n  }\n\n  disableNetwork(): Promise<void> {\n    this.ensureClientConfigured();\n    return this._firestoreClient!.disableNetwork();\n  }\n\n  enablePersistence(settings?: firestore.PersistenceSettings): Promise<void> {\n    if (this._firestoreClient) {\n      throw new FirestoreError(\n        Code.FAILED_PRECONDITION,\n        'Firestore has already been started and persistence can no longer ' +\n          'be enabled. You can only call enablePersistence() before calling ' +\n          'any other methods on a Firestore object.'\n      );\n    }\n\n    let synchronizeTabs = false;\n\n    if (settings) {\n      if (settings.experimentalTabSynchronization !== undefined) {\n        logError(\n          \"The 'experimentalTabSynchronization' setting will be removed. Use 'synchronizeTabs' instead.\"\n        );\n      }\n      synchronizeTabs =\n        settings.synchronizeTabs ??\n        settings.experimentalTabSynchronization ??\n        DEFAULT_SYNCHRONIZE_TABS;\n    }\n\n    return this.configureClient(this._componentProvider, {\n      durable: true,\n      cacheSizeBytes: this._settings.cacheSizeBytes,\n      synchronizeTabs\n    });\n  }\n\n  async clearPersistence(): Promise<void> {\n    if (\n      this._firestoreClient !== undefined &&\n      !this._firestoreClient.clientTerminated\n    ) {\n      throw new FirestoreError(\n        Code.FAILED_PRECONDITION,\n        'Persistence cannot be cleared after this Firestore instance is initialized.'\n      );\n    }\n\n    const deferred = new Deferred<void>();\n    this._queue.enqueueAndForgetEvenAfterShutdown(async () => {\n      try {\n        const databaseInfo = this.makeDatabaseInfo();\n        await this._componentProvider.clearPersistence(databaseInfo);\n        deferred.resolve();\n      } catch (e) {\n        deferred.reject(e);\n      }\n    });\n    return deferred.promise;\n  }\n\n  terminate(): Promise<void> {\n    (this.app as _FirebaseApp)._removeServiceInstance('firestore');\n    return this.INTERNAL.delete();\n  }\n\n  get _isTerminated(): boolean {\n    this.ensureClientConfigured();\n    return this._firestoreClient!.clientTerminated;\n  }\n\n  waitForPendingWrites(): Promise<void> {\n    this.ensureClientConfigured();\n    return this._firestoreClient!.waitForPendingWrites();\n  }\n\n  onSnapshotsInSync(observer: PartialObserver<void>): Unsubscribe;\n  onSnapshotsInSync(onSync: () => void): Unsubscribe;\n  onSnapshotsInSync(arg: unknown): Unsubscribe {\n    this.ensureClientConfigured();\n\n    if (isPartialObserver(arg)) {\n      return this.onSnapshotsInSyncInternal(arg as PartialObserver<void>);\n    } else {\n      validateArgType('Firestore.onSnapshotsInSync', 'function', 1, arg);\n      const observer: PartialObserver<void> = {\n        next: arg as () => void\n      };\n      return this.onSnapshotsInSyncInternal(observer);\n    }\n  }\n\n  private onSnapshotsInSyncInternal(\n    observer: PartialObserver<void>\n  ): Unsubscribe {\n    const errHandler = (err: Error): void => {\n      throw fail('Uncaught Error in onSnapshotsInSync');\n    };\n    const asyncObserver = new AsyncObserver<void>({\n      next: () => {\n        if (observer.next) {\n          observer.next();\n        }\n      },\n      error: errHandler\n    });\n    this._firestoreClient!.addSnapshotsInSyncListener(asyncObserver);\n    return () => {\n      asyncObserver.mute();\n      this._firestoreClient!.removeSnapshotsInSyncListener(asyncObserver);\n    };\n  }\n\n  ensureClientConfigured(): FirestoreClient {\n    if (!this._firestoreClient) {\n      // Kick off starting the client but don't actually wait for it.\n      // eslint-disable-next-line @typescript-eslint/no-floating-promises\n      this.configureClient(new MemoryComponentProvider(), {\n        durable: false\n      });\n    }\n    return this._firestoreClient as FirestoreClient;\n  }\n\n  private makeDatabaseInfo(): DatabaseInfo {\n    return new DatabaseInfo(\n      this._databaseId,\n      this._persistenceKey,\n      this._settings.host,\n      this._settings.ssl,\n      this._settings.forceLongPolling\n    );\n  }\n\n  private configureClient(\n    componentProvider: ComponentProvider,\n    persistenceSettings: PersistenceSettings\n  ): Promise<void> {\n    debugAssert(!!this._settings.host, 'FirestoreSettings.host is not set');\n\n    debugAssert(\n      !this._firestoreClient,\n      'configureClient() called multiple times'\n    );\n\n    const databaseInfo = this.makeDatabaseInfo();\n\n    this._firestoreClient = new FirestoreClient(\n      PlatformSupport.getPlatform(),\n      databaseInfo,\n      this._credentials,\n      this._queue\n    );\n\n    return this._firestoreClient.start(componentProvider, persistenceSettings);\n  }\n\n  private static databaseIdFromApp(app: FirebaseApp): DatabaseId {\n    if (!contains(app.options, 'projectId')) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        '\"projectId\" not provided in firebase.initializeApp.'\n      );\n    }\n\n    const projectId = app.options.projectId;\n    if (!projectId || typeof projectId !== 'string') {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'projectId must be a string in FirebaseApp.options'\n      );\n    }\n    return new DatabaseId(projectId);\n  }\n\n  get app(): FirebaseApp {\n    if (!this._firebaseApp) {\n      throw new FirestoreError(\n        Code.FAILED_PRECONDITION,\n        \"Firestore was not initialized using the Firebase SDK. 'app' is \" +\n          'not available'\n      );\n    }\n    return this._firebaseApp;\n  }\n\n  INTERNAL = {\n    delete: async (): Promise<void> => {\n      // The client must be initalized to ensure that all subsequent API usage\n      // throws an exception.\n      this.ensureClientConfigured();\n      await this._firestoreClient!.terminate();\n    }\n  };\n\n  collection(pathString: string): firestore.CollectionReference {\n    validateExactNumberOfArgs('Firestore.collection', arguments, 1);\n    validateArgType('Firestore.collection', 'non-empty string', 1, pathString);\n    this.ensureClientConfigured();\n    return new CollectionReference(ResourcePath.fromString(pathString), this);\n  }\n\n  doc(pathString: string): firestore.DocumentReference {\n    validateExactNumberOfArgs('Firestore.doc', arguments, 1);\n    validateArgType('Firestore.doc', 'non-empty string', 1, pathString);\n    this.ensureClientConfigured();\n    return DocumentReference.forPath(ResourcePath.fromString(pathString), this);\n  }\n\n  collectionGroup(collectionId: string): firestore.Query {\n    validateExactNumberOfArgs('Firestore.collectionGroup', arguments, 1);\n    validateArgType(\n      'Firestore.collectionGroup',\n      'non-empty string',\n      1,\n      collectionId\n    );\n    if (collectionId.indexOf('/') >= 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Invalid collection ID '${collectionId}' passed to function ` +\n          `Firestore.collectionGroup(). Collection IDs must not contain '/'.`\n      );\n    }\n    this.ensureClientConfigured();\n    return new Query(\n      new InternalQuery(ResourcePath.EMPTY_PATH, collectionId),\n      this\n    );\n  }\n\n  runTransaction<T>(\n    updateFunction: (transaction: firestore.Transaction) => Promise<T>\n  ): Promise<T> {\n    validateExactNumberOfArgs('Firestore.runTransaction', arguments, 1);\n    validateArgType('Firestore.runTransaction', 'function', 1, updateFunction);\n    return this.ensureClientConfigured().transaction(\n      (transaction: InternalTransaction) => {\n        return updateFunction(new Transaction(this, transaction));\n      }\n    );\n  }\n\n  batch(): firestore.WriteBatch {\n    this.ensureClientConfigured();\n\n    return new WriteBatch(this);\n  }\n\n  static get logLevel(): firestore.LogLevel {\n    switch (getLogLevel()) {\n      case LogLevel.DEBUG:\n        return 'debug';\n      case LogLevel.SILENT:\n        return 'silent';\n      default:\n        // The default log level is error\n        return 'error';\n    }\n  }\n\n  static setLogLevel(level: firestore.LogLevel): void {\n    validateExactNumberOfArgs('Firestore.setLogLevel', arguments, 1);\n    validateArgType('Firestore.setLogLevel', 'non-empty string', 1, level);\n    switch (level) {\n      case 'debug':\n        setLogLevel(LogLevel.DEBUG);\n        break;\n      case 'error':\n        setLogLevel(LogLevel.ERROR);\n        break;\n      case 'silent':\n        setLogLevel(LogLevel.SILENT);\n        break;\n      default:\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          'Invalid log level: ' + level\n        );\n    }\n  }\n\n  // Note: this is not a property because the minifier can't work correctly with\n  // the way TypeScript compiler outputs properties.\n  _areTimestampsInSnapshotsEnabled(): boolean {\n    return this._settings.timestampsInSnapshots;\n  }\n}\n\n/**\n * A reference to a transaction.\n */\nexport class Transaction implements firestore.Transaction {\n  constructor(\n    private _firestore: Firestore,\n    private _transaction: InternalTransaction\n  ) {}\n\n  get<T>(\n    documentRef: firestore.DocumentReference<T>\n  ): Promise<firestore.DocumentSnapshot<T>> {\n    validateExactNumberOfArgs('Transaction.get', arguments, 1);\n    const ref = validateReference(\n      'Transaction.get',\n      documentRef,\n      this._firestore\n    );\n    return this._transaction\n      .lookup([ref._key])\n      .then((docs: MaybeDocument[]) => {\n        if (!docs || docs.length !== 1) {\n          return fail('Mismatch in docs returned from document lookup.');\n        }\n        const doc = docs[0];\n        if (doc instanceof NoDocument) {\n          return new DocumentSnapshot<T>(\n            this._firestore,\n            ref._key,\n            null,\n            /* fromCache= */ false,\n            /* hasPendingWrites= */ false,\n            ref._converter\n          );\n        } else if (doc instanceof Document) {\n          return new DocumentSnapshot<T>(\n            this._firestore,\n            ref._key,\n            doc,\n            /* fromCache= */ false,\n            /* hasPendingWrites= */ false,\n            ref._converter\n          );\n        } else {\n          throw fail(\n            `BatchGetDocumentsRequest returned unexpected document type: ${doc.constructor.name}`\n          );\n        }\n      });\n  }\n\n  set<T>(\n    documentRef: firestore.DocumentReference<T>,\n    value: T,\n    options?: firestore.SetOptions\n  ): Transaction {\n    validateBetweenNumberOfArgs('Transaction.set', arguments, 2, 3);\n    const ref = validateReference(\n      'Transaction.set',\n      documentRef,\n      this._firestore\n    );\n    options = validateSetOptions('Transaction.set', options);\n    const [convertedValue, functionName] = applyFirestoreDataConverter(\n      ref._converter,\n      value,\n      'Transaction.set'\n    );\n    const parsed =\n      options.merge || options.mergeFields\n        ? this._firestore._dataReader.parseMergeData(\n            functionName,\n            convertedValue,\n            options.mergeFields\n          )\n        : this._firestore._dataReader.parseSetData(\n            functionName,\n            convertedValue\n          );\n    this._transaction.set(ref._key, parsed);\n    return this;\n  }\n\n  update(\n    documentRef: firestore.DocumentReference<unknown>,\n    value: firestore.UpdateData\n  ): Transaction;\n  update(\n    documentRef: firestore.DocumentReference<unknown>,\n    field: string | ExternalFieldPath,\n    value: unknown,\n    ...moreFieldsAndValues: unknown[]\n  ): Transaction;\n  update(\n    documentRef: firestore.DocumentReference<unknown>,\n    fieldOrUpdateData: string | ExternalFieldPath | firestore.UpdateData,\n    value?: unknown,\n    ...moreFieldsAndValues: unknown[]\n  ): Transaction {\n    let ref;\n    let parsed;\n\n    if (\n      typeof fieldOrUpdateData === 'string' ||\n      fieldOrUpdateData instanceof ExternalFieldPath\n    ) {\n      validateAtLeastNumberOfArgs('Transaction.update', arguments, 3);\n      ref = validateReference(\n        'Transaction.update',\n        documentRef,\n        this._firestore\n      );\n      parsed = this._firestore._dataReader.parseUpdateVarargs(\n        'Transaction.update',\n        fieldOrUpdateData,\n        value,\n        moreFieldsAndValues\n      );\n    } else {\n      validateExactNumberOfArgs('Transaction.update', arguments, 2);\n      ref = validateReference(\n        'Transaction.update',\n        documentRef,\n        this._firestore\n      );\n      parsed = this._firestore._dataReader.parseUpdateData(\n        'Transaction.update',\n        fieldOrUpdateData\n      );\n    }\n\n    this._transaction.update(ref._key, parsed);\n    return this;\n  }\n\n  delete(documentRef: firestore.DocumentReference<unknown>): Transaction {\n    validateExactNumberOfArgs('Transaction.delete', arguments, 1);\n    const ref = validateReference(\n      'Transaction.delete',\n      documentRef,\n      this._firestore\n    );\n    this._transaction.delete(ref._key);\n    return this;\n  }\n}\n\nexport class WriteBatch implements firestore.WriteBatch {\n  private _mutations = [] as Mutation[];\n  private _committed = false;\n\n  constructor(private _firestore: Firestore) {}\n\n  set<T>(\n    documentRef: firestore.DocumentReference<T>,\n    value: T,\n    options?: firestore.SetOptions\n  ): WriteBatch {\n    validateBetweenNumberOfArgs('WriteBatch.set', arguments, 2, 3);\n    this.verifyNotCommitted();\n    const ref = validateReference(\n      'WriteBatch.set',\n      documentRef,\n      this._firestore\n    );\n    options = validateSetOptions('WriteBatch.set', options);\n    const [convertedValue, functionName] = applyFirestoreDataConverter(\n      ref._converter,\n      value,\n      'WriteBatch.set'\n    );\n    const parsed =\n      options.merge || options.mergeFields\n        ? this._firestore._dataReader.parseMergeData(\n            functionName,\n            convertedValue,\n            options.mergeFields\n          )\n        : this._firestore._dataReader.parseSetData(\n            functionName,\n            convertedValue\n          );\n    this._mutations = this._mutations.concat(\n      parsed.toMutations(ref._key, Precondition.none())\n    );\n    return this;\n  }\n\n  update(\n    documentRef: firestore.DocumentReference<unknown>,\n    value: firestore.UpdateData\n  ): WriteBatch;\n  update(\n    documentRef: firestore.DocumentReference<unknown>,\n    field: string | ExternalFieldPath,\n    value: unknown,\n    ...moreFieldsAndValues: unknown[]\n  ): WriteBatch;\n  update(\n    documentRef: firestore.DocumentReference<unknown>,\n    fieldOrUpdateData: string | ExternalFieldPath | firestore.UpdateData,\n    value?: unknown,\n    ...moreFieldsAndValues: unknown[]\n  ): WriteBatch {\n    this.verifyNotCommitted();\n\n    let ref;\n    let parsed;\n\n    if (\n      typeof fieldOrUpdateData === 'string' ||\n      fieldOrUpdateData instanceof ExternalFieldPath\n    ) {\n      validateAtLeastNumberOfArgs('WriteBatch.update', arguments, 3);\n      ref = validateReference(\n        'WriteBatch.update',\n        documentRef,\n        this._firestore\n      );\n      parsed = this._firestore._dataReader.parseUpdateVarargs(\n        'WriteBatch.update',\n        fieldOrUpdateData,\n        value,\n        moreFieldsAndValues\n      );\n    } else {\n      validateExactNumberOfArgs('WriteBatch.update', arguments, 2);\n      ref = validateReference(\n        'WriteBatch.update',\n        documentRef,\n        this._firestore\n      );\n      parsed = this._firestore._dataReader.parseUpdateData(\n        'WriteBatch.update',\n        fieldOrUpdateData\n      );\n    }\n\n    this._mutations = this._mutations.concat(\n      parsed.toMutations(ref._key, Precondition.exists(true))\n    );\n    return this;\n  }\n\n  delete(documentRef: firestore.DocumentReference<unknown>): WriteBatch {\n    validateExactNumberOfArgs('WriteBatch.delete', arguments, 1);\n    this.verifyNotCommitted();\n    const ref = validateReference(\n      'WriteBatch.delete',\n      documentRef,\n      this._firestore\n    );\n    this._mutations = this._mutations.concat(\n      new DeleteMutation(ref._key, Precondition.none())\n    );\n    return this;\n  }\n\n  commit(): Promise<void> {\n    this.verifyNotCommitted();\n    this._committed = true;\n    if (this._mutations.length > 0) {\n      return this._firestore.ensureClientConfigured().write(this._mutations);\n    }\n\n    return Promise.resolve();\n  }\n\n  private verifyNotCommitted(): void {\n    if (this._committed) {\n      throw new FirestoreError(\n        Code.FAILED_PRECONDITION,\n        'A write batch can no longer be used after commit() ' +\n          'has been called.'\n      );\n    }\n  }\n}\n\n/**\n * A reference to a particular document in a collection in the database.\n */\nexport class DocumentReference<T = firestore.DocumentData>\n  implements firestore.DocumentReference<T> {\n  private _firestoreClient: FirestoreClient;\n\n  constructor(\n    public _key: DocumentKey,\n    readonly firestore: Firestore,\n    readonly _converter?: firestore.FirestoreDataConverter<T>\n  ) {\n    this._firestoreClient = this.firestore.ensureClientConfigured();\n  }\n\n  static forPath<U>(\n    path: ResourcePath,\n    firestore: Firestore,\n    converter?: firestore.FirestoreDataConverter<U>\n  ): DocumentReference<U> {\n    if (path.length % 2 !== 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Invalid document reference. Document ' +\n          'references must have an even number of segments, but ' +\n          `${path.canonicalString()} has ${path.length}`\n      );\n    }\n    return new DocumentReference(new DocumentKey(path), firestore, converter);\n  }\n\n  get id(): string {\n    return this._key.path.lastSegment();\n  }\n\n  get parent(): firestore.CollectionReference<T> {\n    return new CollectionReference(\n      this._key.path.popLast(),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  get path(): string {\n    return this._key.path.canonicalString();\n  }\n\n  collection(\n    pathString: string\n  ): firestore.CollectionReference<firestore.DocumentData> {\n    validateExactNumberOfArgs('DocumentReference.collection', arguments, 1);\n    validateArgType(\n      'DocumentReference.collection',\n      'non-empty string',\n      1,\n      pathString\n    );\n    if (!pathString) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Must provide a non-empty collection name to collection()'\n      );\n    }\n    const path = ResourcePath.fromString(pathString);\n    return new CollectionReference(this._key.path.child(path), this.firestore);\n  }\n\n  isEqual(other: firestore.DocumentReference<T>): boolean {\n    if (!(other instanceof DocumentReference)) {\n      throw invalidClassError('isEqual', 'DocumentReference', 1, other);\n    }\n    return (\n      this.firestore === other.firestore &&\n      this._key.isEqual(other._key) &&\n      this._converter === other._converter\n    );\n  }\n\n  set(\n    value: firestore.DocumentData,\n    options?: firestore.SetOptions\n  ): Promise<void>;\n  set(value: T, options?: firestore.SetOptions): Promise<void> {\n    validateBetweenNumberOfArgs('DocumentReference.set', arguments, 1, 2);\n    options = validateSetOptions('DocumentReference.set', options);\n    const [convertedValue, functionName] = applyFirestoreDataConverter(\n      this._converter,\n      value,\n      'DocumentReference.set'\n    );\n    const parsed =\n      options.merge || options.mergeFields\n        ? this.firestore._dataReader.parseMergeData(\n            functionName,\n            convertedValue,\n            options.mergeFields\n          )\n        : this.firestore._dataReader.parseSetData(functionName, convertedValue);\n    return this._firestoreClient.write(\n      parsed.toMutations(this._key, Precondition.none())\n    );\n  }\n\n  update(value: firestore.UpdateData): Promise<void>;\n  update(\n    field: string | ExternalFieldPath,\n    value: unknown,\n    ...moreFieldsAndValues: unknown[]\n  ): Promise<void>;\n  update(\n    fieldOrUpdateData: string | ExternalFieldPath | firestore.UpdateData,\n    value?: unknown,\n    ...moreFieldsAndValues: unknown[]\n  ): Promise<void> {\n    let parsed;\n\n    if (\n      typeof fieldOrUpdateData === 'string' ||\n      fieldOrUpdateData instanceof ExternalFieldPath\n    ) {\n      validateAtLeastNumberOfArgs('DocumentReference.update', arguments, 2);\n      parsed = this.firestore._dataReader.parseUpdateVarargs(\n        'DocumentReference.update',\n        fieldOrUpdateData,\n        value,\n        moreFieldsAndValues\n      );\n    } else {\n      validateExactNumberOfArgs('DocumentReference.update', arguments, 1);\n      parsed = this.firestore._dataReader.parseUpdateData(\n        'DocumentReference.update',\n        fieldOrUpdateData\n      );\n    }\n\n    return this._firestoreClient.write(\n      parsed.toMutations(this._key, Precondition.exists(true))\n    );\n  }\n\n  delete(): Promise<void> {\n    validateExactNumberOfArgs('DocumentReference.delete', arguments, 0);\n    return this._firestoreClient.write([\n      new DeleteMutation(this._key, Precondition.none())\n    ]);\n  }\n\n  onSnapshot(\n    observer: PartialObserver<firestore.DocumentSnapshot<T>>\n  ): Unsubscribe;\n  onSnapshot(\n    options: firestore.SnapshotListenOptions,\n    observer: PartialObserver<firestore.DocumentSnapshot<T>>\n  ): Unsubscribe;\n  onSnapshot(\n    onNext: NextFn<firestore.DocumentSnapshot<T>>,\n    onError?: ErrorFn,\n    onCompletion?: CompleteFn\n  ): Unsubscribe;\n  onSnapshot(\n    options: firestore.SnapshotListenOptions,\n    onNext: NextFn<firestore.DocumentSnapshot<T>>,\n    onError?: ErrorFn,\n    onCompletion?: CompleteFn\n  ): Unsubscribe;\n\n  onSnapshot(...args: unknown[]): Unsubscribe {\n    validateBetweenNumberOfArgs(\n      'DocumentReference.onSnapshot',\n      arguments,\n      1,\n      4\n    );\n    let options: firestore.SnapshotListenOptions = {\n      includeMetadataChanges: false\n    };\n    let observer: PartialObserver<firestore.DocumentSnapshot<T>>;\n    let currArg = 0;\n    if (\n      typeof args[currArg] === 'object' &&\n      !isPartialObserver(args[currArg])\n    ) {\n      options = args[currArg] as firestore.SnapshotListenOptions;\n      validateOptionNames('DocumentReference.onSnapshot', options, [\n        'includeMetadataChanges'\n      ]);\n      validateNamedOptionalType(\n        'DocumentReference.onSnapshot',\n        'boolean',\n        'includeMetadataChanges',\n        options.includeMetadataChanges\n      );\n      currArg++;\n    }\n\n    const internalOptions = {\n      includeMetadataChanges: options.includeMetadataChanges\n    };\n\n    if (isPartialObserver(args[currArg])) {\n      observer = args[currArg] as PartialObserver<\n        firestore.DocumentSnapshot<T>\n      >;\n    } else {\n      validateArgType(\n        'DocumentReference.onSnapshot',\n        'function',\n        currArg,\n        args[currArg]\n      );\n      validateOptionalArgType(\n        'DocumentReference.onSnapshot',\n        'function',\n        currArg + 1,\n        args[currArg + 1]\n      );\n      validateOptionalArgType(\n        'DocumentReference.onSnapshot',\n        'function',\n        currArg + 2,\n        args[currArg + 2]\n      );\n      observer = {\n        next: args[currArg] as NextFn<firestore.DocumentSnapshot<T>>,\n        error: args[currArg + 1] as ErrorFn,\n        complete: args[currArg + 2] as CompleteFn\n      };\n    }\n    return this.onSnapshotInternal(internalOptions, observer);\n  }\n\n  private onSnapshotInternal(\n    options: ListenOptions,\n    observer: PartialObserver<firestore.DocumentSnapshot<T>>\n  ): Unsubscribe {\n    let errHandler = (err: Error): void => {\n      console.error('Uncaught Error in onSnapshot:', err);\n    };\n    if (observer.error) {\n      errHandler = observer.error.bind(observer);\n    }\n\n    const asyncObserver = new AsyncObserver<ViewSnapshot>({\n      next: snapshot => {\n        if (observer.next) {\n          debugAssert(\n            snapshot.docs.size <= 1,\n            'Too many documents returned on a document query'\n          );\n          const doc = snapshot.docs.get(this._key);\n\n          observer.next(\n            new DocumentSnapshot(\n              this.firestore,\n              this._key,\n              doc,\n              snapshot.fromCache,\n              snapshot.hasPendingWrites,\n              this._converter\n            )\n          );\n        }\n      },\n      error: errHandler\n    });\n    const internalListener = this._firestoreClient.listen(\n      InternalQuery.atPath(this._key.path),\n      asyncObserver,\n      options\n    );\n\n    return () => {\n      asyncObserver.mute();\n      this._firestoreClient.unlisten(internalListener);\n    };\n  }\n\n  get(options?: firestore.GetOptions): Promise<firestore.DocumentSnapshot<T>> {\n    validateBetweenNumberOfArgs('DocumentReference.get', arguments, 0, 1);\n    validateGetOptions('DocumentReference.get', options);\n    return new Promise(\n      (resolve: Resolver<firestore.DocumentSnapshot<T>>, reject: Rejecter) => {\n        if (options && options.source === 'cache') {\n          this.firestore\n            .ensureClientConfigured()\n            .getDocumentFromLocalCache(this._key)\n            .then(doc => {\n              resolve(\n                new DocumentSnapshot(\n                  this.firestore,\n                  this._key,\n                  doc,\n                  /*fromCache=*/ true,\n                  doc instanceof Document ? doc.hasLocalMutations : false,\n                  this._converter\n                )\n              );\n            }, reject);\n        } else {\n          this.getViaSnapshotListener(resolve, reject, options);\n        }\n      }\n    );\n  }\n\n  private getViaSnapshotListener(\n    resolve: Resolver<firestore.DocumentSnapshot<T>>,\n    reject: Rejecter,\n    options?: firestore.GetOptions\n  ): void {\n    const unlisten = this.onSnapshotInternal(\n      {\n        includeMetadataChanges: true,\n        waitForSyncWhenOnline: true\n      },\n      {\n        next: (snap: firestore.DocumentSnapshot<T>) => {\n          // Remove query first before passing event to user to avoid\n          // user actions affecting the now stale query.\n          unlisten();\n\n          if (!snap.exists && snap.metadata.fromCache) {\n            // TODO(dimond): If we're online and the document doesn't\n            // exist then we resolve with a doc.exists set to false. If\n            // we're offline however, we reject the Promise in this\n            // case. Two options: 1) Cache the negative response from\n            // the server so we can deliver that even when you're\n            // offline 2) Actually reject the Promise in the online case\n            // if the document doesn't exist.\n            reject(\n              new FirestoreError(\n                Code.UNAVAILABLE,\n                'Failed to get document because the client is ' + 'offline.'\n              )\n            );\n          } else if (\n            snap.exists &&\n            snap.metadata.fromCache &&\n            options &&\n            options.source === 'server'\n          ) {\n            reject(\n              new FirestoreError(\n                Code.UNAVAILABLE,\n                'Failed to get document from server. (However, this ' +\n                  'document does exist in the local cache. Run again ' +\n                  'without setting source to \"server\" to ' +\n                  'retrieve the cached document.)'\n              )\n            );\n          } else {\n            resolve(snap);\n          }\n        },\n        error: reject\n      }\n    );\n  }\n\n  withConverter<U>(\n    converter: firestore.FirestoreDataConverter<U>\n  ): firestore.DocumentReference<U> {\n    return new DocumentReference<U>(this._key, this.firestore, converter);\n  }\n}\n\nclass SnapshotMetadata implements firestore.SnapshotMetadata {\n  constructor(\n    readonly hasPendingWrites: boolean,\n    readonly fromCache: boolean\n  ) {}\n\n  isEqual(other: firestore.SnapshotMetadata): boolean {\n    return (\n      this.hasPendingWrites === other.hasPendingWrites &&\n      this.fromCache === other.fromCache\n    );\n  }\n}\n\n/**\n * Options interface that can be provided to configure the deserialization of\n * DocumentSnapshots.\n */\nexport interface SnapshotOptions extends firestore.SnapshotOptions {}\n\nexport class DocumentSnapshot<T = firestore.DocumentData>\n  implements firestore.DocumentSnapshot<T> {\n  constructor(\n    private _firestore: Firestore,\n    private _key: DocumentKey,\n    public _document: Document | null,\n    private _fromCache: boolean,\n    private _hasPendingWrites: boolean,\n    private readonly _converter?: firestore.FirestoreDataConverter<T>\n  ) {}\n\n  data(options?: firestore.SnapshotOptions): T | undefined {\n    validateBetweenNumberOfArgs('DocumentSnapshot.data', arguments, 0, 1);\n    options = validateSnapshotOptions('DocumentSnapshot.data', options);\n    if (!this._document) {\n      return undefined;\n    } else {\n      // We only want to use the converter and create a new DocumentSnapshot\n      // if a converter has been provided.\n      if (this._converter) {\n        const snapshot = new QueryDocumentSnapshot(\n          this._firestore,\n          this._key,\n          this._document,\n          this._fromCache,\n          this._hasPendingWrites\n        );\n        return this._converter.fromFirestore(snapshot, options);\n      } else {\n        const userDataWriter = new UserDataWriter(\n          this._firestore,\n          this._firestore._areTimestampsInSnapshotsEnabled(),\n          options.serverTimestamps,\n          /* converter= */ undefined\n        );\n        return userDataWriter.convertValue(this._document.toProto()) as T;\n      }\n    }\n  }\n\n  get(\n    fieldPath: string | ExternalFieldPath,\n    options?: firestore.SnapshotOptions\n  ): unknown {\n    validateBetweenNumberOfArgs('DocumentSnapshot.get', arguments, 1, 2);\n    options = validateSnapshotOptions('DocumentSnapshot.get', options);\n    if (this._document) {\n      const value = this._document\n        .data()\n        .field(fieldPathFromArgument('DocumentSnapshot.get', fieldPath));\n      if (value !== null) {\n        const userDataWriter = new UserDataWriter(\n          this._firestore,\n          this._firestore._areTimestampsInSnapshotsEnabled(),\n          options.serverTimestamps,\n          this._converter\n        );\n        return userDataWriter.convertValue(value);\n      }\n    }\n    return undefined;\n  }\n\n  get id(): string {\n    return this._key.path.lastSegment();\n  }\n\n  get ref(): firestore.DocumentReference<T> {\n    return new DocumentReference<T>(\n      this._key,\n      this._firestore,\n      this._converter\n    );\n  }\n\n  get exists(): boolean {\n    return this._document !== null;\n  }\n\n  get metadata(): firestore.SnapshotMetadata {\n    return new SnapshotMetadata(this._hasPendingWrites, this._fromCache);\n  }\n\n  isEqual(other: firestore.DocumentSnapshot<T>): boolean {\n    if (!(other instanceof DocumentSnapshot)) {\n      throw invalidClassError('isEqual', 'DocumentSnapshot', 1, other);\n    }\n    return (\n      this._firestore === other._firestore &&\n      this._fromCache === other._fromCache &&\n      this._key.isEqual(other._key) &&\n      (this._document === null\n        ? other._document === null\n        : this._document.isEqual(other._document)) &&\n      this._converter === other._converter\n    );\n  }\n}\n\nexport class QueryDocumentSnapshot<T = firestore.DocumentData>\n  extends DocumentSnapshot<T>\n  implements firestore.QueryDocumentSnapshot<T> {\n  data(options?: SnapshotOptions): T {\n    const data = super.data(options);\n    debugAssert(\n      data !== undefined,\n      'Document in a QueryDocumentSnapshot should exist'\n    );\n    return data;\n  }\n}\n\nexport class Query<T = firestore.DocumentData> implements firestore.Query<T> {\n  constructor(\n    public _query: InternalQuery,\n    readonly firestore: Firestore,\n    protected readonly _converter?: firestore.FirestoreDataConverter<T>\n  ) {}\n\n  where(\n    field: string | ExternalFieldPath,\n    opStr: firestore.WhereFilterOp,\n    value: unknown\n  ): firestore.Query<T> {\n    validateExactNumberOfArgs('Query.where', arguments, 3);\n    validateDefined('Query.where', 3, value);\n\n    // Enumerated from the WhereFilterOp type in index.d.ts.\n    const whereFilterOpEnums = [\n      Operator.LESS_THAN,\n      Operator.LESS_THAN_OR_EQUAL,\n      Operator.EQUAL,\n      Operator.GREATER_THAN_OR_EQUAL,\n      Operator.GREATER_THAN,\n      Operator.ARRAY_CONTAINS,\n      Operator.IN,\n      Operator.ARRAY_CONTAINS_ANY\n    ];\n    const op = validateStringEnum('Query.where', whereFilterOpEnums, 2, opStr);\n\n    let fieldValue: api.Value;\n    const fieldPath = fieldPathFromArgument('Query.where', field);\n    if (fieldPath.isKeyField()) {\n      if (\n        op === Operator.ARRAY_CONTAINS ||\n        op === Operator.ARRAY_CONTAINS_ANY\n      ) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          `Invalid Query. You can't perform '${op}' ` +\n            'queries on FieldPath.documentId().'\n        );\n      } else if (op === Operator.IN) {\n        this.validateDisjunctiveFilterElements(value, op);\n        const referenceList: api.Value[] = [];\n        for (const arrayValue of value as api.Value[]) {\n          referenceList.push(this.parseDocumentIdValue(arrayValue));\n        }\n        fieldValue = { arrayValue: { values: referenceList } };\n      } else {\n        fieldValue = this.parseDocumentIdValue(value);\n      }\n    } else {\n      if (op === Operator.IN || op === Operator.ARRAY_CONTAINS_ANY) {\n        this.validateDisjunctiveFilterElements(value, op);\n      }\n      fieldValue = this.firestore._dataReader.parseQueryValue(\n        'Query.where',\n        value,\n        // We only allow nested arrays for IN queries.\n        /** allowArrays = */ op === Operator.IN\n      );\n    }\n    const filter = FieldFilter.create(fieldPath, op, fieldValue);\n    this.validateNewFilter(filter);\n    return new Query(\n      this._query.addFilter(filter),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  orderBy(\n    field: string | ExternalFieldPath,\n    directionStr?: firestore.OrderByDirection\n  ): firestore.Query<T> {\n    validateBetweenNumberOfArgs('Query.orderBy', arguments, 1, 2);\n    validateOptionalArgType(\n      'Query.orderBy',\n      'non-empty string',\n      2,\n      directionStr\n    );\n    let direction: Direction;\n    if (directionStr === undefined || directionStr === 'asc') {\n      direction = Direction.ASCENDING;\n    } else if (directionStr === 'desc') {\n      direction = Direction.DESCENDING;\n    } else {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Function Query.orderBy() has unknown direction '${directionStr}', ` +\n          `expected 'asc' or 'desc'.`\n      );\n    }\n    if (this._query.startAt !== null) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Invalid query. You must not call Query.startAt() or ' +\n          'Query.startAfter() before calling Query.orderBy().'\n      );\n    }\n    if (this._query.endAt !== null) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Invalid query. You must not call Query.endAt() or ' +\n          'Query.endBefore() before calling Query.orderBy().'\n      );\n    }\n    const fieldPath = fieldPathFromArgument('Query.orderBy', field);\n    const orderBy = new OrderBy(fieldPath, direction);\n    this.validateNewOrderBy(orderBy);\n    return new Query(\n      this._query.addOrderBy(orderBy),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  limit(n: number): firestore.Query<T> {\n    validateExactNumberOfArgs('Query.limit', arguments, 1);\n    validateArgType('Query.limit', 'number', 1, n);\n    validatePositiveNumber('Query.limit', 1, n);\n    return new Query(\n      this._query.withLimitToFirst(n),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  limitToLast(n: number): firestore.Query<T> {\n    validateExactNumberOfArgs('Query.limitToLast', arguments, 1);\n    validateArgType('Query.limitToLast', 'number', 1, n);\n    validatePositiveNumber('Query.limitToLast', 1, n);\n    return new Query(\n      this._query.withLimitToLast(n),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  startAt(\n    docOrField: unknown | firestore.DocumentSnapshot<unknown>,\n    ...fields: unknown[]\n  ): firestore.Query<T> {\n    validateAtLeastNumberOfArgs('Query.startAt', arguments, 1);\n    const bound = this.boundFromDocOrFields(\n      'Query.startAt',\n      docOrField,\n      fields,\n      /*before=*/ true\n    );\n    return new Query(\n      this._query.withStartAt(bound),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  startAfter(\n    docOrField: unknown | firestore.DocumentSnapshot<unknown>,\n    ...fields: unknown[]\n  ): firestore.Query<T> {\n    validateAtLeastNumberOfArgs('Query.startAfter', arguments, 1);\n    const bound = this.boundFromDocOrFields(\n      'Query.startAfter',\n      docOrField,\n      fields,\n      /*before=*/ false\n    );\n    return new Query(\n      this._query.withStartAt(bound),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  endBefore(\n    docOrField: unknown | firestore.DocumentSnapshot<unknown>,\n    ...fields: unknown[]\n  ): firestore.Query<T> {\n    validateAtLeastNumberOfArgs('Query.endBefore', arguments, 1);\n    const bound = this.boundFromDocOrFields(\n      'Query.endBefore',\n      docOrField,\n      fields,\n      /*before=*/ true\n    );\n    return new Query(\n      this._query.withEndAt(bound),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  endAt(\n    docOrField: unknown | firestore.DocumentSnapshot<unknown>,\n    ...fields: unknown[]\n  ): firestore.Query<T> {\n    validateAtLeastNumberOfArgs('Query.endAt', arguments, 1);\n    const bound = this.boundFromDocOrFields(\n      'Query.endAt',\n      docOrField,\n      fields,\n      /*before=*/ false\n    );\n    return new Query(\n      this._query.withEndAt(bound),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  isEqual(other: firestore.Query<T>): boolean {\n    if (!(other instanceof Query)) {\n      throw invalidClassError('isEqual', 'Query', 1, other);\n    }\n    return (\n      this.firestore === other.firestore && this._query.isEqual(other._query)\n    );\n  }\n\n  withConverter<U>(\n    converter: firestore.FirestoreDataConverter<U>\n  ): firestore.Query<U> {\n    return new Query<U>(this._query, this.firestore, converter);\n  }\n\n  /** Helper function to create a bound from a document or fields */\n  private boundFromDocOrFields(\n    methodName: string,\n    docOrField: unknown | firestore.DocumentSnapshot<T>,\n    fields: unknown[],\n    before: boolean\n  ): Bound {\n    validateDefined(methodName, 1, docOrField);\n    if (docOrField instanceof DocumentSnapshot) {\n      if (fields.length > 0) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          `Too many arguments provided to ${methodName}().`\n        );\n      }\n      const snap = docOrField;\n      if (!snap.exists) {\n        throw new FirestoreError(\n          Code.NOT_FOUND,\n          `Can't use a DocumentSnapshot that doesn't exist for ` +\n            `${methodName}().`\n        );\n      }\n      return this.boundFromDocument(snap._document!, before);\n    } else {\n      const allFields = [docOrField].concat(fields);\n      return this.boundFromFields(methodName, allFields, before);\n    }\n  }\n\n  /**\n   * Create a Bound from a query and a document.\n   *\n   * Note that the Bound will always include the key of the document\n   * and so only the provided document will compare equal to the returned\n   * position.\n   *\n   * Will throw if the document does not contain all fields of the order by\n   * of the query or if any of the fields in the order by are an uncommitted\n   * server timestamp.\n   */\n  private boundFromDocument(doc: Document, before: boolean): Bound {\n    const components: api.Value[] = [];\n\n    // Because people expect to continue/end a query at the exact document\n    // provided, we need to use the implicit sort order rather than the explicit\n    // sort order, because it's guaranteed to contain the document key. That way\n    // the position becomes unambiguous and the query continues/ends exactly at\n    // the provided document. Without the key (by using the explicit sort\n    // orders), multiple documents could match the position, yielding duplicate\n    // results.\n    for (const orderBy of this._query.orderBy) {\n      if (orderBy.field.isKeyField()) {\n        components.push(refValue(this.firestore._databaseId, doc.key));\n      } else {\n        const value = doc.field(orderBy.field);\n        if (isServerTimestamp(value)) {\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            'Invalid query. You are trying to start or end a query using a ' +\n              'document for which the field \"' +\n              orderBy.field +\n              '\" is an uncommitted server timestamp. (Since the value of ' +\n              'this field is unknown, you cannot start/end a query with it.)'\n          );\n        } else if (value !== null) {\n          components.push(value);\n        } else {\n          const field = orderBy.field.canonicalString();\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            `Invalid query. You are trying to start or end a query using a ` +\n              `document for which the field '${field}' (used as the ` +\n              `orderBy) does not exist.`\n          );\n        }\n      }\n    }\n    return new Bound(components, before);\n  }\n\n  /**\n   * Converts a list of field values to a Bound for the given query.\n   */\n  private boundFromFields(\n    methodName: string,\n    values: unknown[],\n    before: boolean\n  ): Bound {\n    // Use explicit order by's because it has to match the query the user made\n    const orderBy = this._query.explicitOrderBy;\n    if (values.length > orderBy.length) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Too many arguments provided to ${methodName}(). ` +\n          `The number of arguments must be less than or equal to the ` +\n          `number of Query.orderBy() clauses`\n      );\n    }\n\n    const components: api.Value[] = [];\n    for (let i = 0; i < values.length; i++) {\n      const rawValue = values[i];\n      const orderByComponent = orderBy[i];\n      if (orderByComponent.field.isKeyField()) {\n        if (typeof rawValue !== 'string') {\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            `Invalid query. Expected a string for document ID in ` +\n              `${methodName}(), but got a ${typeof rawValue}`\n          );\n        }\n        if (\n          !this._query.isCollectionGroupQuery() &&\n          rawValue.indexOf('/') !== -1\n        ) {\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            `Invalid query. When querying a collection and ordering by FieldPath.documentId(), ` +\n              `the value passed to ${methodName}() must be a plain document ID, but ` +\n              `'${rawValue}' contains a slash.`\n          );\n        }\n        const path = this._query.path.child(ResourcePath.fromString(rawValue));\n        if (!DocumentKey.isDocumentKey(path)) {\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            `Invalid query. When querying a collection group and ordering by ` +\n              `FieldPath.documentId(), the value passed to ${methodName}() must result in a ` +\n              `valid document path, but '${path}' is not because it contains an odd number ` +\n              `of segments.`\n          );\n        }\n        const key = new DocumentKey(path);\n        components.push(refValue(this.firestore._databaseId, key));\n      } else {\n        const wrapped = this.firestore._dataReader.parseQueryValue(\n          methodName,\n          rawValue\n        );\n        components.push(wrapped);\n      }\n    }\n\n    return new Bound(components, before);\n  }\n\n  onSnapshot(\n    observer: PartialObserver<firestore.QuerySnapshot<T>>\n  ): Unsubscribe;\n  onSnapshot(\n    options: firestore.SnapshotListenOptions,\n    observer: PartialObserver<firestore.QuerySnapshot<T>>\n  ): Unsubscribe;\n  onSnapshot(\n    onNext: NextFn<firestore.QuerySnapshot<T>>,\n    onError?: ErrorFn,\n    onCompletion?: CompleteFn\n  ): Unsubscribe;\n  onSnapshot(\n    options: firestore.SnapshotListenOptions,\n    onNext: NextFn<firestore.QuerySnapshot<T>>,\n    onError?: ErrorFn,\n    onCompletion?: CompleteFn\n  ): Unsubscribe;\n\n  onSnapshot(...args: unknown[]): Unsubscribe {\n    validateBetweenNumberOfArgs('Query.onSnapshot', arguments, 1, 4);\n    let options: firestore.SnapshotListenOptions = {};\n    let observer: PartialObserver<firestore.QuerySnapshot<T>>;\n    let currArg = 0;\n    if (\n      typeof args[currArg] === 'object' &&\n      !isPartialObserver(args[currArg])\n    ) {\n      options = args[currArg] as firestore.SnapshotListenOptions;\n      validateOptionNames('Query.onSnapshot', options, [\n        'includeMetadataChanges'\n      ]);\n      validateNamedOptionalType(\n        'Query.onSnapshot',\n        'boolean',\n        'includeMetadataChanges',\n        options.includeMetadataChanges\n      );\n      currArg++;\n    }\n\n    if (isPartialObserver(args[currArg])) {\n      observer = args[currArg] as PartialObserver<firestore.QuerySnapshot<T>>;\n    } else {\n      validateArgType('Query.onSnapshot', 'function', currArg, args[currArg]);\n      validateOptionalArgType(\n        'Query.onSnapshot',\n        'function',\n        currArg + 1,\n        args[currArg + 1]\n      );\n      validateOptionalArgType(\n        'Query.onSnapshot',\n        'function',\n        currArg + 2,\n        args[currArg + 2]\n      );\n      observer = {\n        next: args[currArg] as NextFn<firestore.QuerySnapshot<T>>,\n        error: args[currArg + 1] as ErrorFn,\n        complete: args[currArg + 2] as CompleteFn\n      };\n    }\n    this.validateHasExplicitOrderByForLimitToLast(this._query);\n    return this.onSnapshotInternal(options, observer);\n  }\n\n  private onSnapshotInternal(\n    options: ListenOptions,\n    observer: PartialObserver<firestore.QuerySnapshot<T>>\n  ): Unsubscribe {\n    let errHandler = (err: Error): void => {\n      console.error('Uncaught Error in onSnapshot:', err);\n    };\n    if (observer.error) {\n      errHandler = observer.error.bind(observer);\n    }\n\n    const asyncObserver = new AsyncObserver<ViewSnapshot>({\n      next: (result: ViewSnapshot): void => {\n        if (observer.next) {\n          observer.next(\n            new QuerySnapshot(\n              this.firestore,\n              this._query,\n              result,\n              this._converter\n            )\n          );\n        }\n      },\n      error: errHandler\n    });\n\n    const firestoreClient = this.firestore.ensureClientConfigured();\n    const internalListener = firestoreClient.listen(\n      this._query,\n      asyncObserver,\n      options\n    );\n    return (): void => {\n      asyncObserver.mute();\n      firestoreClient.unlisten(internalListener);\n    };\n  }\n\n  private validateHasExplicitOrderByForLimitToLast(query: InternalQuery): void {\n    if (query.hasLimitToLast() && query.explicitOrderBy.length === 0) {\n      throw new FirestoreError(\n        Code.UNIMPLEMENTED,\n        'limitToLast() queries require specifying at least one orderBy() clause'\n      );\n    }\n  }\n\n  get(options?: firestore.GetOptions): Promise<firestore.QuerySnapshot<T>> {\n    validateBetweenNumberOfArgs('Query.get', arguments, 0, 1);\n    validateGetOptions('Query.get', options);\n    this.validateHasExplicitOrderByForLimitToLast(this._query);\n    return new Promise(\n      (resolve: Resolver<firestore.QuerySnapshot<T>>, reject: Rejecter) => {\n        if (options && options.source === 'cache') {\n          this.firestore\n            .ensureClientConfigured()\n            .getDocumentsFromLocalCache(this._query)\n            .then((viewSnap: ViewSnapshot) => {\n              resolve(\n                new QuerySnapshot(\n                  this.firestore,\n                  this._query,\n                  viewSnap,\n                  this._converter\n                )\n              );\n            }, reject);\n        } else {\n          this.getViaSnapshotListener(resolve, reject, options);\n        }\n      }\n    );\n  }\n\n  private getViaSnapshotListener(\n    resolve: Resolver<firestore.QuerySnapshot<T>>,\n    reject: Rejecter,\n    options?: firestore.GetOptions\n  ): void {\n    const unlisten = this.onSnapshotInternal(\n      {\n        includeMetadataChanges: true,\n        waitForSyncWhenOnline: true\n      },\n      {\n        next: (result: firestore.QuerySnapshot<T>) => {\n          // Remove query first before passing event to user to avoid\n          // user actions affecting the now stale query.\n          unlisten();\n\n          if (\n            result.metadata.fromCache &&\n            options &&\n            options.source === 'server'\n          ) {\n            reject(\n              new FirestoreError(\n                Code.UNAVAILABLE,\n                'Failed to get documents from server. (However, these ' +\n                  'documents may exist in the local cache. Run again ' +\n                  'without setting source to \"server\" to ' +\n                  'retrieve the cached documents.)'\n              )\n            );\n          } else {\n            resolve(result);\n          }\n        },\n        error: reject\n      }\n    );\n  }\n\n  /**\n   * Parses the given documentIdValue into a ReferenceValue, throwing\n   * appropriate errors if the value is anything other than a DocumentReference\n   * or String, or if the string is malformed.\n   */\n  private parseDocumentIdValue(documentIdValue: unknown): api.Value {\n    if (typeof documentIdValue === 'string') {\n      if (documentIdValue === '') {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          'Invalid query. When querying with FieldPath.documentId(), you ' +\n            'must provide a valid document ID, but it was an empty string.'\n        );\n      }\n      if (\n        !this._query.isCollectionGroupQuery() &&\n        documentIdValue.indexOf('/') !== -1\n      ) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          `Invalid query. When querying a collection by ` +\n            `FieldPath.documentId(), you must provide a plain document ID, but ` +\n            `'${documentIdValue}' contains a '/' character.`\n        );\n      }\n      const path = this._query.path.child(\n        ResourcePath.fromString(documentIdValue)\n      );\n      if (!DocumentKey.isDocumentKey(path)) {\n        throw new FirestoreError(\n          Code.INVALID_ARGUMENT,\n          `Invalid query. When querying a collection group by ` +\n            `FieldPath.documentId(), the value provided must result in a valid document path, ` +\n            `but '${path}' is not because it has an odd number of segments (${path.length}).`\n        );\n      }\n      return refValue(this.firestore._databaseId, new DocumentKey(path));\n    } else if (documentIdValue instanceof DocumentReference) {\n      const ref = documentIdValue as DocumentReference<T>;\n      return refValue(this.firestore._databaseId, ref._key);\n    } else {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Invalid query. When querying with FieldPath.documentId(), you must provide a valid ` +\n          `string or a DocumentReference, but it was: ` +\n          `${valueDescription(documentIdValue)}.`\n      );\n    }\n  }\n\n  /**\n   * Validates that the value passed into a disjunctrive filter satisfies all\n   * array requirements.\n   */\n  private validateDisjunctiveFilterElements(\n    value: unknown,\n    operator: Operator\n  ): void {\n    if (!Array.isArray(value) || value.length === 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Invalid Query. A non-empty array is required for ' +\n          `'${operator.toString()}' filters.`\n      );\n    }\n    if (value.length > 10) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Invalid Query. '${operator.toString()}' filters support a ` +\n          'maximum of 10 elements in the value array.'\n      );\n    }\n    if (value.indexOf(null) >= 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Invalid Query. '${operator.toString()}' filters cannot contain 'null' ` +\n          'in the value array.'\n      );\n    }\n    if (value.filter(element => Number.isNaN(element)).length > 0) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Invalid Query. '${operator.toString()}' filters cannot contain 'NaN' ` +\n          'in the value array.'\n      );\n    }\n  }\n\n  private validateNewFilter(filter: Filter): void {\n    if (filter instanceof FieldFilter) {\n      const arrayOps = [Operator.ARRAY_CONTAINS, Operator.ARRAY_CONTAINS_ANY];\n      const disjunctiveOps = [Operator.IN, Operator.ARRAY_CONTAINS_ANY];\n      const isArrayOp = arrayOps.indexOf(filter.op) >= 0;\n      const isDisjunctiveOp = disjunctiveOps.indexOf(filter.op) >= 0;\n\n      if (filter.isInequality()) {\n        const existingField = this._query.getInequalityFilterField();\n        if (existingField !== null && !existingField.isEqual(filter.field)) {\n          throw new FirestoreError(\n            Code.INVALID_ARGUMENT,\n            'Invalid query. All where filters with an inequality' +\n              ' (<, <=, >, or >=) must be on the same field. But you have' +\n              ` inequality filters on '${existingField.toString()}'` +\n              ` and '${filter.field.toString()}'`\n          );\n        }\n\n        const firstOrderByField = this._query.getFirstOrderByField();\n        if (firstOrderByField !== null) {\n          this.validateOrderByAndInequalityMatch(\n            filter.field,\n            firstOrderByField\n          );\n        }\n      } else if (isDisjunctiveOp || isArrayOp) {\n        // You can have at most 1 disjunctive filter and 1 array filter. Check if\n        // the new filter conflicts with an existing one.\n        let conflictingOp: Operator | null = null;\n        if (isDisjunctiveOp) {\n          conflictingOp = this._query.findFilterOperator(disjunctiveOps);\n        }\n        if (conflictingOp === null && isArrayOp) {\n          conflictingOp = this._query.findFilterOperator(arrayOps);\n        }\n        if (conflictingOp != null) {\n          // We special case when it's a duplicate op to give a slightly clearer error message.\n          if (conflictingOp === filter.op) {\n            throw new FirestoreError(\n              Code.INVALID_ARGUMENT,\n              'Invalid query. You cannot use more than one ' +\n                `'${filter.op.toString()}' filter.`\n            );\n          } else {\n            throw new FirestoreError(\n              Code.INVALID_ARGUMENT,\n              `Invalid query. You cannot use '${filter.op.toString()}' filters ` +\n                `with '${conflictingOp.toString()}' filters.`\n            );\n          }\n        }\n      }\n    }\n  }\n\n  private validateNewOrderBy(orderBy: OrderBy): void {\n    if (this._query.getFirstOrderByField() === null) {\n      // This is the first order by. It must match any inequality.\n      const inequalityField = this._query.getInequalityFilterField();\n      if (inequalityField !== null) {\n        this.validateOrderByAndInequalityMatch(inequalityField, orderBy.field);\n      }\n    }\n  }\n\n  private validateOrderByAndInequalityMatch(\n    inequality: FieldPath,\n    orderBy: FieldPath\n  ): void {\n    if (!orderBy.isEqual(inequality)) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        `Invalid query. You have a where filter with an inequality ` +\n          `(<, <=, >, or >=) on field '${inequality.toString()}' ` +\n          `and so you must also use '${inequality.toString()}' ` +\n          `as your first Query.orderBy(), but your first Query.orderBy() ` +\n          `is on field '${orderBy.toString()}' instead.`\n      );\n    }\n  }\n}\n\nexport class QuerySnapshot<T = firestore.DocumentData>\n  implements firestore.QuerySnapshot<T> {\n  private _cachedChanges: Array<firestore.DocumentChange<T>> | null = null;\n  private _cachedChangesIncludeMetadataChanges: boolean | null = null;\n\n  readonly metadata: firestore.SnapshotMetadata;\n\n  constructor(\n    private readonly _firestore: Firestore,\n    private readonly _originalQuery: InternalQuery,\n    private readonly _snapshot: ViewSnapshot,\n    private readonly _converter?: firestore.FirestoreDataConverter<T>\n  ) {\n    this.metadata = new SnapshotMetadata(\n      _snapshot.hasPendingWrites,\n      _snapshot.fromCache\n    );\n  }\n\n  get docs(): Array<firestore.QueryDocumentSnapshot<T>> {\n    const result: Array<firestore.QueryDocumentSnapshot<T>> = [];\n    this.forEach(doc => result.push(doc));\n    return result;\n  }\n\n  get empty(): boolean {\n    return this._snapshot.docs.isEmpty();\n  }\n\n  get size(): number {\n    return this._snapshot.docs.size;\n  }\n\n  forEach(\n    callback: (result: firestore.QueryDocumentSnapshot<T>) => void,\n    thisArg?: unknown\n  ): void {\n    validateBetweenNumberOfArgs('QuerySnapshot.forEach', arguments, 1, 2);\n    validateArgType('QuerySnapshot.forEach', 'function', 1, callback);\n    this._snapshot.docs.forEach(doc => {\n      callback.call(thisArg, this.convertToDocumentImpl(doc));\n    });\n  }\n\n  get query(): firestore.Query<T> {\n    return new Query(this._originalQuery, this._firestore, this._converter);\n  }\n\n  docChanges(\n    options?: firestore.SnapshotListenOptions\n  ): Array<firestore.DocumentChange<T>> {\n    if (options) {\n      validateOptionNames('QuerySnapshot.docChanges', options, [\n        'includeMetadataChanges'\n      ]);\n      validateNamedOptionalType(\n        'QuerySnapshot.docChanges',\n        'boolean',\n        'includeMetadataChanges',\n        options.includeMetadataChanges\n      );\n    }\n\n    const includeMetadataChanges = !!(\n      options && options.includeMetadataChanges\n    );\n\n    if (includeMetadataChanges && this._snapshot.excludesMetadataChanges) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'To include metadata changes with your document changes, you must ' +\n          'also pass { includeMetadataChanges:true } to onSnapshot().'\n      );\n    }\n\n    if (\n      !this._cachedChanges ||\n      this._cachedChangesIncludeMetadataChanges !== includeMetadataChanges\n    ) {\n      this._cachedChanges = changesFromSnapshot<T>(\n        this._firestore,\n        includeMetadataChanges,\n        this._snapshot,\n        this._converter\n      );\n      this._cachedChangesIncludeMetadataChanges = includeMetadataChanges;\n    }\n\n    return this._cachedChanges;\n  }\n\n  /** Check the equality. The call can be very expensive. */\n  isEqual(other: firestore.QuerySnapshot<T>): boolean {\n    if (!(other instanceof QuerySnapshot)) {\n      throw invalidClassError('isEqual', 'QuerySnapshot', 1, other);\n    }\n\n    return (\n      this._firestore === other._firestore &&\n      this._originalQuery.isEqual(other._originalQuery) &&\n      this._snapshot.isEqual(other._snapshot) &&\n      this._converter === other._converter\n    );\n  }\n\n  private convertToDocumentImpl(doc: Document): QueryDocumentSnapshot<T> {\n    return new QueryDocumentSnapshot(\n      this._firestore,\n      doc.key,\n      doc,\n      this.metadata.fromCache,\n      this._snapshot.mutatedKeys.has(doc.key),\n      this._converter\n    );\n  }\n}\n\nexport class CollectionReference<T = firestore.DocumentData> extends Query<T>\n  implements firestore.CollectionReference<T> {\n  constructor(\n    readonly _path: ResourcePath,\n    firestore: Firestore,\n    _converter?: firestore.FirestoreDataConverter<T>\n  ) {\n    super(InternalQuery.atPath(_path), firestore, _converter);\n    if (_path.length % 2 !== 1) {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Invalid collection reference. Collection ' +\n          'references must have an odd number of segments, but ' +\n          `${_path.canonicalString()} has ${_path.length}`\n      );\n    }\n  }\n\n  get id(): string {\n    return this._query.path.lastSegment();\n  }\n\n  get parent(): firestore.DocumentReference<firestore.DocumentData> | null {\n    const parentPath = this._query.path.popLast();\n    if (parentPath.isEmpty()) {\n      return null;\n    } else {\n      return new DocumentReference<firestore.DocumentData>(\n        new DocumentKey(parentPath),\n        this.firestore\n      );\n    }\n  }\n\n  get path(): string {\n    return this._query.path.canonicalString();\n  }\n\n  doc(pathString?: string): firestore.DocumentReference<T> {\n    validateBetweenNumberOfArgs('CollectionReference.doc', arguments, 0, 1);\n    // We allow omission of 'pathString' but explicitly prohibit passing in both\n    // 'undefined' and 'null'.\n    if (arguments.length === 0) {\n      pathString = AutoId.newId();\n    }\n    validateArgType(\n      'CollectionReference.doc',\n      'non-empty string',\n      1,\n      pathString\n    );\n    if (pathString === '') {\n      throw new FirestoreError(\n        Code.INVALID_ARGUMENT,\n        'Document path must be a non-empty string'\n      );\n    }\n    const path = ResourcePath.fromString(pathString!);\n    return DocumentReference.forPath<T>(\n      this._query.path.child(path),\n      this.firestore,\n      this._converter\n    );\n  }\n\n  add(value: T): Promise<firestore.DocumentReference<T>> {\n    validateExactNumberOfArgs('CollectionReference.add', arguments, 1);\n    const convertedValue = this._converter\n      ? this._converter.toFirestore(value)\n      : value;\n    validateArgType('CollectionReference.add', 'object', 1, convertedValue);\n    const docRef = this.doc();\n    return docRef.set(value).then(() => docRef);\n  }\n\n  withConverter<U>(\n    converter: firestore.FirestoreDataConverter<U>\n  ): firestore.CollectionReference<U> {\n    return new CollectionReference<U>(this._path, this.firestore, converter);\n  }\n}\n\nfunction validateSetOptions(\n  methodName: string,\n  options: firestore.SetOptions | undefined\n): firestore.SetOptions {\n  if (options === undefined) {\n    return {\n      merge: false\n    };\n  }\n\n  validateOptionNames(methodName, options, ['merge', 'mergeFields']);\n  validateNamedOptionalType(methodName, 'boolean', 'merge', options.merge);\n  validateOptionalArrayElements(\n    methodName,\n    'mergeFields',\n    'a string or a FieldPath',\n    options.mergeFields,\n    element =>\n      typeof element === 'string' || element instanceof ExternalFieldPath\n  );\n\n  if (options.mergeFields !== undefined && options.merge !== undefined) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      `Invalid options passed to function ${methodName}(): You cannot specify both \"merge\" ` +\n        `and \"mergeFields\".`\n    );\n  }\n\n  return options;\n}\n\nfunction validateSnapshotOptions(\n  methodName: string,\n  options: firestore.SnapshotOptions | undefined\n): firestore.SnapshotOptions {\n  if (options === undefined) {\n    return {};\n  }\n\n  validateOptionNames(methodName, options, ['serverTimestamps']);\n  validateNamedOptionalPropertyEquals(\n    methodName,\n    'options',\n    'serverTimestamps',\n    options.serverTimestamps,\n    ['estimate', 'previous', 'none']\n  );\n  return options;\n}\n\nfunction validateGetOptions(\n  methodName: string,\n  options: firestore.GetOptions | undefined\n): void {\n  validateOptionalArgType(methodName, 'object', 1, options);\n  if (options) {\n    validateOptionNames(methodName, options, ['source']);\n    validateNamedOptionalPropertyEquals(\n      methodName,\n      'options',\n      'source',\n      options.source,\n      ['default', 'server', 'cache']\n    );\n  }\n}\n\nfunction validateReference<T>(\n  methodName: string,\n  documentRef: firestore.DocumentReference<T>,\n  firestore: Firestore\n): DocumentReference<T> {\n  if (!(documentRef instanceof DocumentReference)) {\n    throw invalidClassError(methodName, 'DocumentReference', 1, documentRef);\n  } else if (documentRef.firestore !== firestore) {\n    throw new FirestoreError(\n      Code.INVALID_ARGUMENT,\n      'Provided document reference is from a different Firestore instance.'\n    );\n  } else {\n    return documentRef;\n  }\n}\n\n/**\n * Calculates the array of firestore.DocumentChange's for a given ViewSnapshot.\n *\n * Exported for testing.\n */\nexport function changesFromSnapshot<T>(\n  firestore: Firestore,\n  includeMetadataChanges: boolean,\n  snapshot: ViewSnapshot,\n  converter?: firestore.FirestoreDataConverter<T>\n): Array<firestore.DocumentChange<T>> {\n  if (snapshot.oldDocs.isEmpty()) {\n    // Special case the first snapshot because index calculation is easy and\n    // fast\n    let lastDoc: Document;\n    let index = 0;\n    return snapshot.docChanges.map(change => {\n      const doc = new QueryDocumentSnapshot<T>(\n        firestore,\n        change.doc.key,\n        change.doc,\n        snapshot.fromCache,\n        snapshot.mutatedKeys.has(change.doc.key),\n        converter\n      );\n      debugAssert(\n        change.type === ChangeType.Added,\n        'Invalid event type for first snapshot'\n      );\n      debugAssert(\n        !lastDoc || snapshot.query.docComparator(lastDoc, change.doc) < 0,\n        'Got added events in wrong order'\n      );\n      lastDoc = change.doc;\n      return {\n        type: 'added' as firestore.DocumentChangeType,\n        doc,\n        oldIndex: -1,\n        newIndex: index++\n      };\n    });\n  } else {\n    // A DocumentSet that is updated incrementally as changes are applied to use\n    // to lookup the index of a document.\n    let indexTracker = snapshot.oldDocs;\n    return snapshot.docChanges\n      .filter(\n        change => includeMetadataChanges || change.type !== ChangeType.Metadata\n      )\n      .map(change => {\n        const doc = new QueryDocumentSnapshot<T>(\n          firestore,\n          change.doc.key,\n          change.doc,\n          snapshot.fromCache,\n          snapshot.mutatedKeys.has(change.doc.key),\n          converter\n        );\n        let oldIndex = -1;\n        let newIndex = -1;\n        if (change.type !== ChangeType.Added) {\n          oldIndex = indexTracker.indexOf(change.doc.key);\n          debugAssert(oldIndex >= 0, 'Index for document not found');\n          indexTracker = indexTracker.delete(change.doc.key);\n        }\n        if (change.type !== ChangeType.Removed) {\n          indexTracker = indexTracker.add(change.doc);\n          newIndex = indexTracker.indexOf(change.doc.key);\n        }\n        return { type: resultChangeType(change.type), doc, oldIndex, newIndex };\n      });\n  }\n}\n\nfunction resultChangeType(type: ChangeType): firestore.DocumentChangeType {\n  switch (type) {\n    case ChangeType.Added:\n      return 'added';\n    case ChangeType.Modified:\n    case ChangeType.Metadata:\n      return 'modified';\n    case ChangeType.Removed:\n      return 'removed';\n    default:\n      return fail('Unknown change type: ' + type);\n  }\n}\n\n/**\n * Converts custom model object of type T into DocumentData by applying the\n * converter if it exists.\n *\n * This function is used when converting user objects to DocumentData\n * because we want to provide the user with a more specific error message if\n * their set() or fails due to invalid data originating from a toFirestore()\n * call.\n */\nfunction applyFirestoreDataConverter<T>(\n  converter: firestore.FirestoreDataConverter<T> | undefined,\n  value: T,\n  functionName: string\n): [firestore.DocumentData, string] {\n  let convertedValue;\n  if (converter) {\n    convertedValue = converter.toFirestore(value);\n    functionName = 'toFirestore() in ' + functionName;\n  } else {\n    convertedValue = value as firestore.DocumentData;\n  }\n  return [convertedValue, functionName];\n}\n\nfunction contains(obj: object, key: string): obj is { key: unknown } {\n  return Object.prototype.hasOwnProperty.call(obj, key);\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Code, FirestoreError } from './error';\n\n/**\n * Helper function to prevent instantiation through the constructor.\n *\n * This method creates a new constructor that throws when it's invoked.\n * The prototype of that constructor is then set to the prototype of the hidden\n * \"class\" to expose all the prototype methods and allow for instanceof\n * checks.\n *\n * To also make all the static methods available, all properties of the\n * original constructor are copied to the new constructor.\n */\nexport function makeConstructorPrivate<T extends Function>(\n  cls: T,\n  optionalMessage?: string\n): T {\n  function PublicConstructor(): never {\n    let error = 'This constructor is private.';\n    if (optionalMessage) {\n      error += ' ';\n      error += optionalMessage;\n    }\n    throw new FirestoreError(Code.INVALID_ARGUMENT, error);\n  }\n\n  // Make sure instanceof checks work and all methods are exposed on the public\n  // constructor\n  PublicConstructor.prototype = cls.prototype;\n\n  // Copy any static methods/members\n  Object.assign(PublicConstructor, cls);\n\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  return PublicConstructor as any;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport firebase from '@firebase/app';\nimport { FirebaseNamespace } from '@firebase/app-types';\n\nimport { Firestore } from './src/api/database';\nimport { IndexedDbComponentProvider } from './src/core/component_provider';\nimport { configureForFirebase } from './src/platform/config';\nimport { name, version } from './package.json';\n\nimport './register-module';\nimport './src/platform_browser/browser_init';\n\n/**\n * Registers the main Firestore build with the components framework.\n * Persistence can be enabled via `firebase.firestore().enablePersistence()`.\n */\nexport function registerFirestore(instance: FirebaseNamespace): void {\n  configureForFirebase(\n    instance,\n    (app, auth) => new Firestore(app, auth, new IndexedDbComponentProvider())\n  );\n  instance.registerVersion(name, version);\n}\n\nregisterFirestore(firebase);\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseApp, FirebaseNamespace } from '@firebase/app-types';\nimport { FirebaseAuthInternalName } from '@firebase/auth-interop-types';\nimport { _FirebaseNamespace } from '@firebase/app-types/private';\nimport { Component, ComponentType, Provider } from '@firebase/component';\nimport {\n  CACHE_SIZE_UNLIMITED,\n  Firestore,\n  DocumentReference,\n  DocumentSnapshot,\n  QueryDocumentSnapshot,\n  Query,\n  QuerySnapshot,\n  CollectionReference,\n  Transaction,\n  WriteBatch\n} from '../api/database';\nimport { Blob } from '../api/blob';\nimport { FieldPath } from '../api/field_path';\nimport { GeoPoint } from '../api/geo_point';\nimport { Timestamp } from '../api/timestamp';\nimport { makeConstructorPrivate } from '../util/api';\nimport { FieldValue } from '../api/field_value';\n\n// Public instance that disallows construction at runtime. Note that this still\n// allows instanceof checks.\nexport const PublicFirestore = makeConstructorPrivate(\n  Firestore,\n  'Use firebase.firestore() instead.'\n);\nexport const PublicTransaction = makeConstructorPrivate(\n  Transaction,\n  'Use firebase.firestore().runTransaction() instead.'\n);\nexport const PublicWriteBatch = makeConstructorPrivate(\n  WriteBatch,\n  'Use firebase.firestore().batch() instead.'\n);\nexport const PublicDocumentReference = makeConstructorPrivate(\n  DocumentReference,\n  'Use firebase.firestore().doc() instead.'\n);\nexport const PublicDocumentSnapshot = makeConstructorPrivate(DocumentSnapshot);\nexport const PublicQueryDocumentSnapshot = makeConstructorPrivate(\n  QueryDocumentSnapshot\n);\nexport const PublicQuery = makeConstructorPrivate(Query);\nexport const PublicQuerySnapshot = makeConstructorPrivate(QuerySnapshot);\nexport const PublicCollectionReference = makeConstructorPrivate(\n  CollectionReference,\n  'Use firebase.firestore().collection() instead.'\n);\nexport const PublicFieldValue = makeConstructorPrivate(\n  FieldValue,\n  'Use FieldValue.<field>() instead.'\n);\nexport const PublicBlob = makeConstructorPrivate(\n  Blob,\n  'Use Blob.fromUint8Array() or Blob.fromBase64String() instead.'\n);\n\nconst firestoreNamespace = {\n  Firestore: PublicFirestore,\n  GeoPoint,\n  Timestamp,\n  Blob: PublicBlob,\n  Transaction: PublicTransaction,\n  WriteBatch: PublicWriteBatch,\n  DocumentReference: PublicDocumentReference,\n  DocumentSnapshot: PublicDocumentSnapshot,\n  Query: PublicQuery,\n  QueryDocumentSnapshot: PublicQueryDocumentSnapshot,\n  QuerySnapshot: PublicQuerySnapshot,\n  CollectionReference: PublicCollectionReference,\n  FieldPath,\n  FieldValue: PublicFieldValue,\n  setLogLevel: Firestore.setLogLevel,\n  CACHE_SIZE_UNLIMITED\n};\n\n/**\n * Configures Firestore as part of the Firebase SDK by calling registerService.\n *\n * @param firebase The FirebaseNamespace to register Firestore with\n * @param firestoreFactory A factory function that returns a new Firestore\n *    instance.\n */\nexport function configureForFirebase(\n  firebase: FirebaseNamespace,\n  firestoreFactory: (\n    app: FirebaseApp,\n    auth: Provider<FirebaseAuthInternalName>\n  ) => Firestore\n): void {\n  (firebase as _FirebaseNamespace).INTERNAL.registerComponent(\n    new Component(\n      'firestore',\n      container => {\n        const app = container.getProvider('app').getImmediate()!;\n        return firestoreFactory(app, container.getProvider('auth-internal'));\n      },\n      ComponentType.PUBLIC\n    ).setServiceProps({ ...firestoreNamespace })\n  );\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { ConnectivityMonitor, NetworkStatus } from './connectivity_monitor';\n\nexport class NoopConnectivityMonitor implements ConnectivityMonitor {\n  addCallback(callback: (status: NetworkStatus) => void): void {\n    // No-op.\n  }\n\n  shutdown(): void {\n    // No-op.\n  }\n}\n","/**\n * @license\n * Copyright 2019 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { logDebug } from '../util/log';\nimport {\n  ConnectivityMonitor,\n  ConnectivityMonitorCallback,\n  NetworkStatus\n} from './../remote/connectivity_monitor';\n\n// References to `window` are guarded by BrowserConnectivityMonitor.isAvailable()\n/* eslint-disable no-restricted-globals */\n\nconst LOG_TAG = 'ConnectivityMonitor';\n\n/**\n * Browser implementation of ConnectivityMonitor.\n */\nexport class BrowserConnectivityMonitor implements ConnectivityMonitor {\n  private readonly networkAvailableListener = (): void =>\n    this.onNetworkAvailable();\n  private readonly networkUnavailableListener = (): void =>\n    this.onNetworkUnavailable();\n  private callbacks: ConnectivityMonitorCallback[] = [];\n\n  constructor() {\n    this.configureNetworkMonitoring();\n  }\n\n  addCallback(callback: (status: NetworkStatus) => void): void {\n    this.callbacks.push(callback);\n  }\n\n  shutdown(): void {\n    window.removeEventListener('online', this.networkAvailableListener);\n    window.removeEventListener('offline', this.networkUnavailableListener);\n  }\n\n  private configureNetworkMonitoring(): void {\n    window.addEventListener('online', this.networkAvailableListener);\n    window.addEventListener('offline', this.networkUnavailableListener);\n  }\n\n  private onNetworkAvailable(): void {\n    logDebug(LOG_TAG, 'Network connectivity changed: AVAILABLE');\n    for (const callback of this.callbacks) {\n      callback(NetworkStatus.AVAILABLE);\n    }\n  }\n\n  private onNetworkUnavailable(): void {\n    logDebug(LOG_TAG, 'Network connectivity changed: UNAVAILABLE');\n    for (const callback of this.callbacks) {\n      callback(NetworkStatus.UNAVAILABLE);\n    }\n  }\n\n  // TODO(chenbrian): Consider passing in window either into this component or\n  // here for testing via FakeWindow.\n  /** Checks that all used attributes of window are available. */\n  static isAvailable(): boolean {\n    return (\n      typeof window !== 'undefined' &&\n      window.addEventListener !== undefined &&\n      window.removeEventListener !== undefined\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert } from '../util/assert';\nimport { FirestoreError } from '../util/error';\n\nimport { Stream } from './connection';\n\n/**\n * Provides a simple helper class that implements the Stream interface to\n * bridge to other implementations that are streams but do not implement the\n * interface. The stream callbacks are invoked with the callOn... methods.\n */\nexport class StreamBridge<I, O> implements Stream<I, O> {\n  private wrappedOnOpen: (() => void) | undefined;\n  private wrappedOnClose: ((err?: FirestoreError) => void) | undefined;\n  private wrappedOnMessage: ((msg: O) => void) | undefined;\n\n  private sendFn: (msg: I) => void;\n  private closeFn: () => void;\n\n  constructor(args: { sendFn: (msg: I) => void; closeFn: () => void }) {\n    this.sendFn = args.sendFn;\n    this.closeFn = args.closeFn;\n  }\n\n  onOpen(callback: () => void): void {\n    debugAssert(!this.wrappedOnOpen, 'Called onOpen on stream twice!');\n    this.wrappedOnOpen = callback;\n  }\n\n  onClose(callback: (err?: FirestoreError) => void): void {\n    debugAssert(!this.wrappedOnClose, 'Called onClose on stream twice!');\n    this.wrappedOnClose = callback;\n  }\n\n  onMessage(callback: (msg: O) => void): void {\n    debugAssert(!this.wrappedOnMessage, 'Called onMessage on stream twice!');\n    this.wrappedOnMessage = callback;\n  }\n\n  close(): void {\n    this.closeFn();\n  }\n\n  send(msg: I): void {\n    this.sendFn(msg);\n  }\n\n  callOnOpen(): void {\n    debugAssert(\n      this.wrappedOnOpen !== undefined,\n      'Cannot call onOpen because no callback was set'\n    );\n    this.wrappedOnOpen();\n  }\n\n  callOnClose(err?: FirestoreError): void {\n    debugAssert(\n      this.wrappedOnClose !== undefined,\n      'Cannot call onClose because no callback was set'\n    );\n    this.wrappedOnClose(err);\n  }\n\n  callOnMessage(msg: O): void {\n    debugAssert(\n      this.wrappedOnMessage !== undefined,\n      'Cannot call onMessage because no callback was set'\n    );\n    this.wrappedOnMessage(msg);\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport {\n  createWebChannelTransport,\n  ErrorCode,\n  EventType,\n  WebChannel,\n  WebChannelError,\n  WebChannelOptions,\n  XhrIo\n} from '@firebase/webchannel-wrapper';\n\nimport {\n  isBrowserExtension,\n  isElectron,\n  isIE,\n  isMobileCordova,\n  isReactNative,\n  isUWP\n} from '@firebase/util';\n\nimport { Token } from '../api/credentials';\nimport { DatabaseId, DatabaseInfo } from '../core/database_info';\nimport { SDK_VERSION } from '../core/version';\nimport { Connection, Stream } from '../remote/connection';\nimport {\n  mapCodeFromRpcStatus,\n  mapCodeFromHttpResponseErrorStatus\n} from '../remote/rpc_error';\nimport { StreamBridge } from '../remote/stream_bridge';\nimport { debugAssert, fail, hardAssert } from '../util/assert';\nimport { Code, FirestoreError } from '../util/error';\nimport { logDebug } from '../util/log';\nimport { Indexable } from '../util/misc';\nimport { Rejecter, Resolver } from '../util/promise';\nimport { StringMap } from '../util/types';\n\nconst LOG_TAG = 'Connection';\n\nconst RPC_STREAM_SERVICE = 'google.firestore.v1.Firestore';\nconst RPC_URL_VERSION = 'v1';\n\n/**\n * Maps RPC names to the corresponding REST endpoint name.\n * Uses Object Literal notation to avoid renaming.\n */\nconst RPC_NAME_REST_MAPPING: { [key: string]: string } = {};\nRPC_NAME_REST_MAPPING['BatchGetDocuments'] = 'batchGet';\nRPC_NAME_REST_MAPPING['Commit'] = 'commit';\n\n// TODO(b/38203344): The SDK_VERSION is set independently from Firebase because\n// we are doing out-of-band releases. Once we release as part of Firebase, we\n// should use the Firebase version instead.\nconst X_GOOG_API_CLIENT_VALUE = 'gl-js/ fire/' + SDK_VERSION;\n\nconst XHR_TIMEOUT_SECS = 15;\n\nexport class WebChannelConnection implements Connection {\n  private readonly databaseId: DatabaseId;\n  private readonly baseUrl: string;\n  private readonly forceLongPolling: boolean;\n\n  constructor(info: DatabaseInfo) {\n    this.databaseId = info.databaseId;\n    const proto = info.ssl ? 'https' : 'http';\n    this.baseUrl = proto + '://' + info.host;\n    this.forceLongPolling = info.forceLongPolling;\n  }\n\n  /**\n   * Modifies the headers for a request, adding any authorization token if\n   * present and any additional headers for the request.\n   */\n  private modifyHeadersForRequest(\n    headers: StringMap,\n    token: Token | null\n  ): void {\n    if (token) {\n      for (const header in token.authHeaders) {\n        if (token.authHeaders.hasOwnProperty(header)) {\n          headers[header] = token.authHeaders[header];\n        }\n      }\n    }\n    headers['X-Goog-Api-Client'] = X_GOOG_API_CLIENT_VALUE;\n  }\n\n  invokeRPC<Req, Resp>(\n    rpcName: string,\n    request: Req,\n    token: Token | null\n  ): Promise<Resp> {\n    const url = this.makeUrl(rpcName);\n\n    return new Promise((resolve: Resolver<Resp>, reject: Rejecter) => {\n      const xhr = new XhrIo();\n      xhr.listenOnce(EventType.COMPLETE, () => {\n        try {\n          switch (xhr.getLastErrorCode()) {\n            case ErrorCode.NO_ERROR:\n              const json = xhr.getResponseJson() as Resp;\n              logDebug(LOG_TAG, 'XHR received:', JSON.stringify(json));\n              resolve(json);\n              break;\n            case ErrorCode.TIMEOUT:\n              logDebug(LOG_TAG, 'RPC \"' + rpcName + '\" timed out');\n              reject(\n                new FirestoreError(Code.DEADLINE_EXCEEDED, 'Request time out')\n              );\n              break;\n            case ErrorCode.HTTP_ERROR:\n              const status = xhr.getStatus();\n              logDebug(\n                LOG_TAG,\n                'RPC \"' + rpcName + '\" failed with status:',\n                status,\n                'response text:',\n                xhr.getResponseText()\n              );\n              if (status > 0) {\n                const responseError = (xhr.getResponseJson() as WebChannelError)\n                  .error;\n                if (\n                  !!responseError &&\n                  !!responseError.status &&\n                  !!responseError.message\n                ) {\n                  const firestoreErrorCode = mapCodeFromHttpResponseErrorStatus(\n                    responseError.status\n                  );\n                  reject(\n                    new FirestoreError(\n                      firestoreErrorCode,\n                      responseError.message\n                    )\n                  );\n                } else {\n                  reject(\n                    new FirestoreError(\n                      Code.UNKNOWN,\n                      'Server responded with status ' + xhr.getStatus()\n                    )\n                  );\n                }\n              } else {\n                // If we received an HTTP_ERROR but there's no status code,\n                // it's most probably a connection issue\n                logDebug(LOG_TAG, 'RPC \"' + rpcName + '\" failed');\n                reject(\n                  new FirestoreError(Code.UNAVAILABLE, 'Connection failed.')\n                );\n              }\n              break;\n            default:\n              fail(\n                'RPC \"' +\n                  rpcName +\n                  '\" failed with unanticipated ' +\n                  'webchannel error ' +\n                  xhr.getLastErrorCode() +\n                  ': ' +\n                  xhr.getLastError() +\n                  ', giving up.'\n              );\n          }\n        } finally {\n          logDebug(LOG_TAG, 'RPC \"' + rpcName + '\" completed.');\n        }\n      });\n\n      // The database field is already encoded in URL. Specifying it again in\n      // the body is not necessary in production, and will cause duplicate field\n      // errors in the Firestore Emulator. Let's remove it.\n      const jsonObj = ({ ...request } as unknown) as Indexable;\n      delete jsonObj.database;\n\n      const requestString = JSON.stringify(jsonObj);\n      logDebug(LOG_TAG, 'XHR sending: ', url + ' ' + requestString);\n      // Content-Type: text/plain will avoid preflight requests which might\n      // mess with CORS and redirects by proxies. If we add custom headers\n      // we will need to change this code to potentially use the\n      // $httpOverwrite parameter supported by ESF to avoid\n      // triggering preflight requests.\n      const headers: StringMap = { 'Content-Type': 'text/plain' };\n\n      this.modifyHeadersForRequest(headers, token);\n\n      xhr.send(url, 'POST', requestString, headers, XHR_TIMEOUT_SECS);\n    });\n  }\n\n  invokeStreamingRPC<Req, Resp>(\n    rpcName: string,\n    request: Req,\n    token: Token | null\n  ): Promise<Resp[]> {\n    // The REST API automatically aggregates all of the streamed results, so we\n    // can just use the normal invoke() method.\n    return this.invokeRPC<Req, Resp[]>(rpcName, request, token);\n  }\n\n  openStream<Req, Resp>(\n    rpcName: string,\n    token: Token | null\n  ): Stream<Req, Resp> {\n    const urlParts = [\n      this.baseUrl,\n      '/',\n      RPC_STREAM_SERVICE,\n      '/',\n      rpcName,\n      '/channel'\n    ];\n    const webchannelTransport = createWebChannelTransport();\n    const request: WebChannelOptions = {\n      // Required for backend stickiness, routing behavior is based on this\n      // parameter.\n      httpSessionIdParam: 'gsessionid',\n      initMessageHeaders: {},\n      messageUrlParams: {\n        // This param is used to improve routing and project isolation by the\n        // backend and must be included in every request.\n        database: `projects/${this.databaseId.projectId}/databases/${this.databaseId.database}`\n      },\n      sendRawJson: true,\n      supportsCrossDomainXhr: true,\n      internalChannelParams: {\n        // Override the default timeout (randomized between 10-20 seconds) since\n        // a large write batch on a slow internet connection may take a long\n        // time to send to the backend. Rather than have WebChannel impose a\n        // tight timeout which could lead to infinite timeouts and retries, we\n        // set it very large (5-10 minutes) and rely on the browser's builtin\n        // timeouts to kick in if the request isn't working.\n        forwardChannelRequestTimeoutMs: 10 * 60 * 1000\n      },\n      forceLongPolling: this.forceLongPolling\n    };\n\n    this.modifyHeadersForRequest(request.initMessageHeaders!, token);\n\n    // Sending the custom headers we just added to request.initMessageHeaders\n    // (Authorization, etc.) will trigger the browser to make a CORS preflight\n    // request because the XHR will no longer meet the criteria for a \"simple\"\n    // CORS request:\n    // https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#Simple_requests\n    //\n    // Therefore to avoid the CORS preflight request (an extra network\n    // roundtrip), we use the httpHeadersOverwriteParam option to specify that\n    // the headers should instead be encoded into a special \"$httpHeaders\" query\n    // parameter, which is recognized by the webchannel backend. This is\n    // formally defined here:\n    // https://github.com/google/closure-library/blob/b0e1815b13fb92a46d7c9b3c30de5d6a396a3245/closure/goog/net/rpc/httpcors.js#L32\n    //\n    // TODO(b/145624756): There is a backend bug where $httpHeaders isn't respected if the request\n    // doesn't have an Origin header. So we have to exclude a few browser environments that are\n    // known to (sometimes) not include an Origin. See\n    // https://github.com/firebase/firebase-js-sdk/issues/1491.\n    if (\n      !isMobileCordova() &&\n      !isReactNative() &&\n      !isElectron() &&\n      !isIE() &&\n      !isUWP() &&\n      !isBrowserExtension()\n    ) {\n      request.httpHeadersOverwriteParam = '$httpHeaders';\n    }\n\n    const url = urlParts.join('');\n    logDebug(LOG_TAG, 'Creating WebChannel: ' + url + ' ' + request);\n    const channel = webchannelTransport.createWebChannel(url, request);\n\n    // WebChannel supports sending the first message with the handshake - saving\n    // a network round trip. However, it will have to call send in the same\n    // JS event loop as open. In order to enforce this, we delay actually\n    // opening the WebChannel until send is called. Whether we have called\n    // open is tracked with this variable.\n    let opened = false;\n\n    // A flag to determine whether the stream was closed (by us or through an\n    // error/close event) to avoid delivering multiple close events or sending\n    // on a closed stream\n    let closed = false;\n\n    const streamBridge = new StreamBridge<Req, Resp>({\n      sendFn: (msg: Req) => {\n        if (!closed) {\n          if (!opened) {\n            logDebug(LOG_TAG, 'Opening WebChannel transport.');\n            channel.open();\n            opened = true;\n          }\n          logDebug(LOG_TAG, 'WebChannel sending:', msg);\n          channel.send(msg);\n        } else {\n          logDebug(LOG_TAG, 'Not sending because WebChannel is closed:', msg);\n        }\n      },\n      closeFn: () => channel.close()\n    });\n\n    // Closure events are guarded and exceptions are swallowed, so catch any\n    // exception and rethrow using a setTimeout so they become visible again.\n    // Note that eventually this function could go away if we are confident\n    // enough the code is exception free.\n    const unguardedEventListen = <T>(\n      type: string,\n      fn: (param?: T) => void\n    ): void => {\n      // TODO(dimond): closure typing seems broken because WebChannel does\n      // not implement goog.events.Listenable\n      channel.listen(type, (param: unknown) => {\n        try {\n          fn(param as T);\n        } catch (e) {\n          setTimeout(() => {\n            throw e;\n          }, 0);\n        }\n      });\n    };\n\n    unguardedEventListen(WebChannel.EventType.OPEN, () => {\n      if (!closed) {\n        logDebug(LOG_TAG, 'WebChannel transport opened.');\n      }\n    });\n\n    unguardedEventListen(WebChannel.EventType.CLOSE, () => {\n      if (!closed) {\n        closed = true;\n        logDebug(LOG_TAG, 'WebChannel transport closed');\n        streamBridge.callOnClose();\n      }\n    });\n\n    unguardedEventListen<Error>(WebChannel.EventType.ERROR, err => {\n      if (!closed) {\n        closed = true;\n        logDebug(LOG_TAG, 'WebChannel transport errored:', err);\n        streamBridge.callOnClose(\n          new FirestoreError(\n            Code.UNAVAILABLE,\n            'The operation could not be completed'\n          )\n        );\n      }\n    });\n\n    // WebChannel delivers message events as array. If batching is not enabled\n    // (it's off by default) each message will be delivered alone, resulting in\n    // a single element array.\n    interface WebChannelResponse {\n      data: Resp[];\n    }\n\n    unguardedEventListen<WebChannelResponse>(\n      WebChannel.EventType.MESSAGE,\n      msg => {\n        if (!closed) {\n          const msgData = msg!.data[0];\n          hardAssert(!!msgData, 'Got a webchannel message without data.');\n          // TODO(b/35143891): There is a bug in One Platform that caused errors\n          // (and only errors) to be wrapped in an extra array. To be forward\n          // compatible with the bug we need to check either condition. The latter\n          // can be removed once the fix has been rolled out.\n          // Use any because msgData.error is not typed.\n          const msgDataOrError: WebChannelError | object = msgData;\n          const error =\n            msgDataOrError.error ||\n            (msgDataOrError as WebChannelError[])[0]?.error;\n          if (error) {\n            logDebug(LOG_TAG, 'WebChannel received error:', error);\n            // error.status will be a string like 'OK' or 'NOT_FOUND'.\n            const status: string = error.status;\n            let code = mapCodeFromRpcStatus(status);\n            let message = error.message;\n            if (code === undefined) {\n              code = Code.INTERNAL;\n              message =\n                'Unknown error status: ' +\n                status +\n                ' with message ' +\n                error.message;\n            }\n            // Mark closed so no further events are propagated\n            closed = true;\n            streamBridge.callOnClose(new FirestoreError(code, message));\n            channel.close();\n          } else {\n            logDebug(LOG_TAG, 'WebChannel received:', msgData);\n            streamBridge.callOnMessage(msgData);\n          }\n        }\n      }\n    );\n\n    setTimeout(() => {\n      // Technically we could/should wait for the WebChannel opened event,\n      // but because we want to send the first message with the WebChannel\n      // handshake we pretend the channel opened here (asynchronously), and\n      // then delay the actual open until the first message is sent.\n      streamBridge.callOnOpen();\n    }, 0);\n    return streamBridge;\n  }\n\n  // visible for testing\n  makeUrl(rpcName: string): string {\n    const urlRpcName = RPC_NAME_REST_MAPPING[rpcName];\n    debugAssert(\n      urlRpcName !== undefined,\n      'Unknown REST mapping for: ' + rpcName\n    );\n    return (\n      this.baseUrl +\n      '/' +\n      RPC_URL_VERSION +\n      '/projects/' +\n      this.databaseId.projectId +\n      '/databases/' +\n      this.databaseId.database +\n      '/documents:' +\n      urlRpcName\n    );\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { DatabaseId, DatabaseInfo } from '../core/database_info';\nimport { Platform } from '../platform/platform';\nimport { Connection } from '../remote/connection';\nimport { JsonProtoSerializer } from '../remote/serializer';\nimport { ConnectivityMonitor } from './../remote/connectivity_monitor';\n\nimport { NoopConnectivityMonitor } from '../remote/connectivity_monitor_noop';\nimport { BrowserConnectivityMonitor } from './browser_connectivity_monitor';\nimport { WebChannelConnection } from './webchannel_connection';\nimport { debugAssert } from '../util/assert';\n\n// Implements the Platform API for browsers and some browser-like environments\n// (including ReactNative).\nexport class BrowserPlatform implements Platform {\n  readonly base64Available: boolean;\n\n  constructor() {\n    this.base64Available = typeof atob !== 'undefined';\n  }\n\n  get document(): Document | null {\n    // `document` is not always available, e.g. in ReactNative and WebWorkers.\n    // eslint-disable-next-line no-restricted-globals\n    return typeof document !== 'undefined' ? document : null;\n  }\n\n  get window(): Window | null {\n    // `window` is not always available, e.g. in ReactNative and WebWorkers.\n    // eslint-disable-next-line no-restricted-globals\n    return typeof window !== 'undefined' ? window : null;\n  }\n\n  loadConnection(databaseInfo: DatabaseInfo): Promise<Connection> {\n    return Promise.resolve(new WebChannelConnection(databaseInfo));\n  }\n\n  newConnectivityMonitor(): ConnectivityMonitor {\n    if (BrowserConnectivityMonitor.isAvailable()) {\n      return new BrowserConnectivityMonitor();\n    } else {\n      return new NoopConnectivityMonitor();\n    }\n  }\n\n  newSerializer(databaseId: DatabaseId): JsonProtoSerializer {\n    return new JsonProtoSerializer(databaseId, { useProto3Json: true });\n  }\n\n  formatJSON(value: unknown): string {\n    return JSON.stringify(value);\n  }\n\n  atob(encoded: string): string {\n    return atob(encoded);\n  }\n\n  btoa(raw: string): string {\n    return btoa(raw);\n  }\n\n  randomBytes(nBytes: number): Uint8Array {\n    debugAssert(nBytes >= 0, `Expecting non-negative nBytes, got: ${nBytes}`);\n\n    // Polyfills for IE and WebWorker by using `self` and `msCrypto` when `crypto` is not available.\n    const crypto =\n      // eslint-disable-next-line @typescript-eslint/no-explicit-any\n      typeof self !== 'undefined' && (self.crypto || (self as any)['msCrypto']);\n    const bytes = new Uint8Array(nBytes);\n    if (crypto) {\n      crypto.getRandomValues(bytes);\n    } else {\n      // Falls back to Math.random\n      for (let i = 0; i < nBytes; i++) {\n        bytes[i] = Math.floor(Math.random() * 256);\n      }\n    }\n    return bytes;\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { PlatformSupport } from '../platform/platform';\nimport { BrowserPlatform } from './browser_platform';\n\n/**\n * This code needs to run before Firestore is used. This can be achieved in\n * several ways:\n *   1) Through the JSCompiler compiling this code and then (automatically)\n *      executing it before exporting the Firestore symbols.\n *   2) Through importing this module first in a Firestore main module\n */\nPlatformSupport.setPlatform(new 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