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/**
* Copyright (c) 2013-present, 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 performanceNow;
/**
* 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 (performance.now) {
performanceNow = () => performance.now();
} else {
performanceNow = () => Date.now();
}
module.exports = performanceNow;
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