/**
 * @license
 * Copyright 2020 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 { PersistenceInternal, PersistenceType, PersistenceValue } from '../../src/core/persistence';
/**
 * Helper class for mocking completely broken persistence that errors when
 * accessed.
 *
 * When disabling cookies in Chrome entirely, for example, simply reading the
 * "localStorage" field in "window" will throw an error, but this can't be
 * checked for by calling `'localStorage' in window`. This class simulates a
 * situation where _isAvailable works correctly but all other methods fail.
 */
export declare class ErroringUnavailablePersistence implements PersistenceInternal {
    type: PersistenceType;
    _isAvailable(): Promise<boolean>;
    _set(): Promise<void>;
    _get<T extends PersistenceValue>(): Promise<T | null>;
    _remove(): Promise<void>;
    _addListener(): void;
    _removeListener(): void;
    _shouldAllowMigration: boolean;
}