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27 lines
767 B
27 lines
767 B
10 years ago
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/**
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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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