recoil/cjs/recoil_values/Recoil_constSelector.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.
 *
 * @emails oncall+recoil
 * @flow strict-local
 * @format
 */
'use strict';

import type { RecoilValueReadOnly } from '../core/Recoil_RecoilValue';
import type { Parameter } from './Recoil_selectorFamily';

const cacheWithReferenceEquality = require('../caches/Recoil_cacheWithReferenceEquality');

const selectorFamily = require('./Recoil_selectorFamily'); // flowlint-next-line unclear-type:off


const constantSelector = selectorFamily<any, any>({
  key: '__constant',
  get: constant => () => constant,
  cacheImplementationForParams_UNSTABLE: cacheWithReferenceEquality
}); // Function that returns a selector which always produces the
// same constant value.  It may be called multiple times with the
// same value, based on reference equality, and will provide the
// same selector.

declare function constSelector<T: Parameter>(constant: T): RecoilValueReadOnly<T>;
module.exports = constSelector;