/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * Implements (a subset of) the interface of built-in Map but supports arrays as
 * keys. Two keys are equal if corresponding elements are equal according to the
 * equality semantics of built-in Map. Operations are at worst O(n*b) where n is
 * the array length and b is the complexity of the built-in operation.
 *
 * @emails oncall+recoil
 * @flow
 * @format
 */
'use strict'; // eslint-disable-next-line fb-www/no-symbol

const LEAF = Symbol('ArrayKeyedMap');
const emptyMap = new Map();
declare class ArrayKeyedMap<V> {
  constructor(existing?: ArrayKeyedMap<V> | Iterable<[mixed, V]>): ArrayKeyedMap<V>,
  get(key: mixed): V | void,
  set(key: mixed, value: V): any,
  delete(key: mixed): any,
  entries(): Iterator<[$ReadOnlyArray<mixed>, V]>,
  toBuiltInMap(): Map<$ReadOnlyArray<mixed>, V>,
}
module.exports = ArrayKeyedMap;