/**
 * @license
 * Copyright 2017 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 { FirebaseInternalDependencies } from '../interfaces/internal-dependencies';
import { FirebaseMessaging } from '@firebase/messaging-types';
import { NextFn, Observer, Unsubscribe } from '@firebase/util';
import { FirebaseApp } from '@firebase/app-types';
import { FirebaseService } from '@firebase/app-types/private';
export declare class WindowController implements FirebaseMessaging, FirebaseService {
    private readonly firebaseDependencies;
    private vapidKey;
    private swRegistration?;
    private onMessageCallback;
    constructor(firebaseDependencies: FirebaseInternalDependencies);
    get app(): FirebaseApp;
    getToken(): Promise<string>;
    deleteToken(): Promise<boolean>;
    /**
     * Request permission if it is not currently granted.
     *
     * @return Resolves if the permission was granted, rejects otherwise.
     *
     * @deprecated Use Notification.requestPermission() instead.
     * https://developer.mozilla.org/en-US/docs/Web/API/Notification/requestPermission
     */
    requestPermission(): Promise<void>;
    usePublicVapidKey(vapidKey: string): void;
    useServiceWorker(swRegistration: ServiceWorkerRegistration): void;
    /**
     * @param nextOrObserver An observer object or a function triggered on
     * message.
     * @return The unsubscribe function for the observer.
     */
    onMessage(nextOrObserver: NextFn<object> | Observer<object>): Unsubscribe;
    setBackgroundMessageHandler(): void;
    onTokenRefresh(): Unsubscribe;
    /**
     * Creates or updates the default service worker registration.
     * @return The service worker registration to be used for the push service.
     */
    private getServiceWorkerRegistration;
    private messageEventListener;
    private logEvent;
}