recoil/cjs/util/Recoil_CopyOnWrite.js.flow

Recoil - A state management library for React

/**
 * 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.
 *
 * Utilities for working with built-in Maps and Sets without mutating them.
 *
 * @emails oncall+recoil
 * @flow strict
 * @format
 */
'use strict';

declare function setByAddingToSet<V>(set: $ReadOnlySet<V>, v: V): Set<V>;
declare function setByDeletingFromSet<V>(set: $ReadOnlySet<V>, v: V): Set<V>;
declare function mapBySettingInMap<K, V>(map: $ReadOnlyMap<K, V>, k: K, v: V): Map<K, V>;
declare function mapByUpdatingInMap<K, V>(map: $ReadOnlyMap<K, V>, k: K, updater: (V | void) => V): Map<K, V>;
declare function mapByDeletingFromMap<K, V>(map: $ReadOnlyMap<K, V>, k: K): Map<K, V>;
declare function mapByDeletingMultipleFromMap<K, V>(map: $ReadOnlyMap<K, V>, ks: Set<K>): Map<K, V>;
module.exports = {
  setByAddingToSet,
  setByDeletingFromSet,
  mapBySettingInMap,
  mapByUpdatingInMap,
  mapByDeletingFromMap,
  mapByDeletingMultipleFromMap
};