/**
 * @license
 * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at
 * http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at
 * http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at
 * http://polymer.github.io/PATENTS.txt
 */
/**
 * This is a special map which automatically creates
 * a default value if the key is not found.
 */
export declare class MapWithDefault<K, V> extends Map<K, V> {
    private readonly makeDefault;
    constructor(makeDefault: (key: K) => V);
    get(key: K): V;
}