/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * 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 { DbInterface } from './db-interface';
export declare class VapidDetailsModel extends DbInterface {
    protected readonly dbName: string;
    protected readonly dbVersion: number;
    protected readonly objectStoreName: string;
    protected onDbUpgrade(request: IDBOpenDBRequest): void;
    /**
     * Given a service worker scope, this method will look up the vapid key
     * in indexedDB.
     */
    getVapidFromSWScope(swScope: string): Promise<Uint8Array | undefined>;
    /**
     * Save a vapid key against a swScope for later date.
     */
    saveVapidDetails(swScope: string, vapidKey: Uint8Array): Promise<void>;
    /**
     * This method deletes details of the current FCM VAPID key for a SW scope.
     * Resolves once the scope/vapid details have been deleted and returns the
     * deleted vapid key.
     */
    deleteVapidDetails(swScope: string): Promise<Uint8Array>;
}