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53 lines
1.8 KiB
53 lines
1.8 KiB
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = flushMicroTasks;
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/* istanbul ignore file */
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// the part of this file that we need tested is definitely being run
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// and the part that is not cannot easily have useful tests written
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// anyway. So we're just going to ignore coverage for this file
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/**
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* copied from React's enqueueTask.js
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*/
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let didWarnAboutMessageChannel = false;
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let enqueueTask;
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try {
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// read require off the module object to get around the bundlers.
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// we don't want them to detect a require and bundle a Node polyfill.
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const requireString = `require${Math.random()}`.slice(0, 7);
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const nodeRequire = module && module[requireString]; // assuming we're in node, let's try to get node's
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// version of setImmediate, bypassing fake timers if any.
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enqueueTask = nodeRequire('timers').setImmediate;
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} catch (_err) {
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// we're in a browser
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// we can't use regular timers because they may still be faked
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// so we try MessageChannel+postMessage instead
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enqueueTask = callback => {
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const supportsMessageChannel = typeof MessageChannel === 'function';
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if (supportsMessageChannel) {
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const channel = new MessageChannel();
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channel.port1.onmessage = callback;
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channel.port2.postMessage(undefined);
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} else if (didWarnAboutMessageChannel === false) {
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didWarnAboutMessageChannel = true; // eslint-disable-next-line no-console
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console.error('This browser does not have a MessageChannel implementation, ' + 'so enqueuing tasks via await act(async () => ...) will fail. ' + 'Please file an issue at https://github.com/facebook/react/issues ' + 'if you encounter this warning.');
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}
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};
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}
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function flushMicroTasks() {
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return {
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then(resolve) {
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enqueueTask(resolve);
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}
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};
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}
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