# All files / functions on-id-change.ts

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     /**
     * @license
     * Copyright 2019 Google LLC
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    import { addCallback, removeCallback } from '../helpers/fid-changed';
    import { FirebaseDependencies } from '../interfaces/firebase-dependencies';

    export type IdChangeCallbackFn = (installationId: string) => void;
    export type IdChangeUnsubscribeFn = () => void;

    /**
     * Sets a new callback that will get called when Installation ID changes.
     * Returns an unsubscribe function that will remove the callback when called.
     */
    export function onIdChange(
      { appConfig }: FirebaseDependencies,
      callback: IdChangeCallbackFn
    ): IdChangeUnsubscribeFn {
      addCallback(appConfig, callback);

      return () => {
        removeCallback(appConfig, callback);
      };
    }