You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
19 lines
613 B
19 lines
613 B
/**
|
|
* 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
|
|
*/
|
|
const performance = require("./performance");
|
|
|
|
const loadTime = Date.now();
|
|
/**
|
|
* 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.
|
|
*/
|
|
|
|
module.exports = performance.now ? () => performance.now() : () => Date.now() - loadTime; |