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packages/react-native/Libraries/Core/Timers/queueMicrotask.js
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Marco Wang
Deploy 0.276.0 to xplat (#52720)
19 июл 2025, 21:08
19 июл 2025, 21:08
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/** * 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 * @format */ 'use strict'; let resolvedPromise; /** * Polyfill for the microtask queueing API defined by WHATWG HTML spec. * https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-queuemicrotask * * The method must queue a microtask to invoke @param {function} callback, and * if the callback throws an exception, report the exception. */ export default function queueMicrotask(callback: Function) { if (arguments.length < 1) { throw new TypeError( 'queueMicrotask must be called with at least one argument (a function to call)', ); } if (typeof callback !== 'function') { throw new TypeError('The argument to queueMicrotask must be a function.'); } // Try to reuse a lazily allocated resolved promise from closure. // $FlowFixMe[constant-condition] (resolvedPromise || (resolvedPromise = Promise.resolve())) .then(callback) .catch(error => // Report the exception until the next tick. setTimeout(() => { throw error; }, 0), ); }