/**
|
* Copyright (c) 2015, Facebook, Inc.
|
* All rights reserved.
|
*
|
* This source code is licensed under the BSD-style license found in the
|
* LICENSE file in the root directory of this source tree. An additional grant
|
* of patent rights can be found in the PATENTS file in the same directory.
|
*
|
* @providesModule ExecutionEnvironment
|
*/
|
|
/*jslint evil: true */
|
|
'use strict';
|
|
var 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.
|
*/
|
var 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;
|
