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- /**
- * 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;
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