/**
 * @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.
 */
/**
 * An in-memory storage implementation that matches the API of DOMStorageWrapper
 * (TODO: create interface for both to implement).
 */
export declare class MemoryStorage {
    private cache_;
    set(key: string, value: unknown | null): void;
    get(key: string): unknown;
    remove(key: string): void;
    isInMemoryStorage: boolean;
}