33 lines
728 B
Plaintext
33 lines
728 B
Plaintext
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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* @flow
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* @format
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*/
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// flowlint ambiguous-object-type:error
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'use strict';
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const isPerformanceNowAvailable =
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typeof window !== 'undefined' &&
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typeof window?.performance?.now === 'function';
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function currentTimestamp(): number {
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if (isPerformanceNowAvailable) {
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return window.performance.now();
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}
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return Date.now();
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}
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function withDuration<T>(cb: () => T): [number, T] {
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const startTime = currentTimestamp();
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const result = cb();
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return [currentTimestamp() - startTime, result];
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}
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module.exports = withDuration;
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