react-native
Version:
A framework for building native apps using React
30 lines (27 loc) • 909 B
JavaScript
/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow strict
* @format
*/
import NativePerformance from '../WebPerformance/NativePerformance';
import Performance from '../WebPerformance/Performance';
// In case if the native implementation of the Performance API is available, use it,
// otherwise fall back to the legacy/default one, which only defines 'Performance.now()'
if (NativePerformance) {
// $FlowExpectedError[cannot-write]
global.performance = new Performance();
} else {
if (!global.performance) {
// $FlowExpectedError[cannot-write]
global.performance = ({
now: function () {
const performanceNow = global.nativePerformanceNow || Date.now;
return performanceNow();
},
}: {now?: () => number});
}
}