githubmr/facebook-react: The library for web and native user interfaces.

packages/shared/objectIs.js

20 строк603 B

Kuba Juszczyk

Optimize objectIs (#16212)

18 сен 2019, 00:55

18 сен 2019, 00:55d862f0e

/**
 * 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.
 *
 * @flow
 */

/**
 * inlined Object.is polyfill to avoid requiring consumers ship their own
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
 */
function is(x: any, y: any) {
  return (
    (x === y && (x !== 0 || 1 / x === 1 / y)) || (x !== x && y !== y) // eslint-disable-line no-self-compare
  );
}

export default (typeof Object.is === 'function' ? Object.is : is);