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https://github.com/zebrajr/react.git
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3e9251d605
This PR introduces adds `react/testing` and `react-dom/testing`. - changes infra to generate these builds - exports act on ReactDOM in these testing builds - uses the new test builds in fixtures/dom In the next PR - - I'll use the new builds for all our own tests - I'll replace usages of TestUtils.act with ReactDOM.act.
49 lines
1.8 KiB
JavaScript
49 lines
1.8 KiB
JavaScript
/**
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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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*/
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let didWarnAboutMessageChannel = false;
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let enqueueTaskImpl = null;
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export default function enqueueTask(task: () => void) {
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if (enqueueTaskImpl === null) {
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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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let requireString = ('require' + Math.random()).slice(0, 7);
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let nodeRequire = module && module[requireString];
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// 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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enqueueTaskImpl = 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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enqueueTaskImpl = function(callback: () => void) {
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if (__DEV__) {
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if (didWarnAboutMessageChannel === false) {
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didWarnAboutMessageChannel = true;
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if (typeof MessageChannel === 'undefined') {
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console.error(
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'This browser does not have a MessageChannel implementation, ' +
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'so enqueuing tasks via await act(async () => ...) will fail. ' +
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'Please file an issue at https://github.com/facebook/react/issues ' +
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'if you encounter this warning.',
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);
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}
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}
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}
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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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};
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}
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}
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return enqueueTaskImpl(task);
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}
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