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- /**
- * Copyright (c) 2013-present, Facebook, Inc.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @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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