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26 lines
767 B
26 lines
767 B
/** |
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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 performanceNow |
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* @typechecks |
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*/ |
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var performance = require("./performance"); |
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/** |
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* Detect if we can use `window.performance.now()` and gracefully fallback to |
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* `Date.now()` if it doesn't exist. We need to support Firefox < 15 for now |
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* because of Facebook's testing infrastructure. |
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*/ |
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if (!performance || !performance.now) { |
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performance = Date; |
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} |
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var performanceNow = performance.now.bind(performance); |
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module.exports = performanceNow;
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