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42 lines
1.1 KiB
42 lines
1.1 KiB
/** |
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* Copyright 2013-2015, Facebook, Inc. |
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* All rights reserved. |
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* |
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* This source code is licensed under the BSD-style license found in the |
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* LICENSE file in the root directory of this source tree. An additional grant |
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* of patent rights can be found in the PATENTS file in the same directory. |
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* |
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* @providesModule ExecutionEnvironment |
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*/ |
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/*jslint evil: true */ |
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"use strict"; |
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var canUseDOM = !!( |
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(typeof window !== 'undefined' && |
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window.document && window.document.createElement) |
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); |
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/** |
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* Simple, lightweight module assisting with the detection and context of |
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* Worker. Helps avoid circular dependencies and allows code to reason about |
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* whether or not they are in a Worker, even if they never include the main |
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* `ReactWorker` dependency. |
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*/ |
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var ExecutionEnvironment = { |
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canUseDOM: canUseDOM, |
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canUseWorkers: typeof Worker !== 'undefined', |
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canUseEventListeners: |
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canUseDOM && !!(window.addEventListener || window.attachEvent), |
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canUseViewport: canUseDOM && !!window.screen, |
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isInWorker: !canUseDOM // For now, this is true - might change in the future. |
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}; |
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module.exports = ExecutionEnvironment;
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