motion
Version:
motion - moving development forward
28 lines (23 loc) • 814 B
JavaScript
/**
* Copyright 2013-2015, 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 performanceNow
* @typechecks
*/
var performance = require('performance');
var curPerformance = performance;
/**
* Detect if we can use `window.performance.now()` and gracefully fallback to
* `Date.now()` if it doesn't exist. We need to support Firefox < 15 for now
* because of Facebook's testing infrastructure.
*/
if (!curPerformance || !curPerformance.now) {
curPerformance = Date;
}
var performanceNow = curPerformance.now.bind(curPerformance);
module.exports = performanceNow;