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24 lines
630 B
24 lines
630 B
"use strict";
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/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @typechecks
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*/
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var performance = require("./performance");
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var loadTime = Date.now();
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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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module.exports = performance.now ? function () {
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return performance.now();
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} : function () {
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return Date.now() - loadTime;
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}; |