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

packages/shared/ExecutionEnvironment.js

14 строк377 B

FUJI Goro

give `canUseDOM` with a possibility to be a constant (#14194)

25 апр 2019, 13:28

25 апр 2019, 13:281eb2b89

/**
 * 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
 */

export const canUseDOM: boolean = !!(
  typeof window !== 'undefined' &&
  typeof window.document !== 'undefined' &&
  typeof window.document.createElement !== 'undefined'
);