ExecutionEnvironment.js.flow

/**
 * Copyright (c) 2013-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @providesModule ExecutionEnvironment
 */
'use strict';

const canUseDOM = !!(typeof window !== 'undefined' && window.document && window.document.createElement);
/**
 * Simple, lightweight module assisting with the detection and context of
 * Worker. Helps avoid circular dependencies and allows code to reason about
 * whether or not they are in a Worker, even if they never include the main
 * `ReactWorker` dependency.
 */

const ExecutionEnvironment = {
  canUseDOM: canUseDOM,
  canUseWorkers: typeof Worker !== 'undefined',
  canUseEventListeners: canUseDOM && !!(window.addEventListener || window.attachEvent),
  canUseViewport: canUseDOM && !!window.screen,
  isInWorker: !canUseDOM // For now, this is true - might change in the future.

};
module.exports = ExecutionEnvironment;