| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @flow |
| 8 | */ |
| 9 | |
| 10 | let didWarnAboutMessageChannel = false; |
| 11 | let enqueueTaskImpl = null; |
| 12 | |
| 13 | export default function enqueueTask(task: () => void): void { |
| 14 | if (enqueueTaskImpl === null) { |
| 15 | try { |
| 16 | // read require off the module object to get around the bundlers. |
| 17 | // we don't want them to detect a require and bundle a Node polyfill. |
| 18 | const requireString = ('require' + Math.random()).slice(0, 7); |
| 19 | // $FlowFixMe[invalid-computed-prop] |
| 20 | const nodeRequire = module && module[requireString]; |
| 21 | // assuming we're in node, let's try to get node's |
| 22 | // version of setImmediate, bypassing fake timers if any. |
| 23 | enqueueTaskImpl = nodeRequire.call(module, 'timers').setImmediate; |
| 24 | } catch (_err) { |
| 25 | // we're in a browser |
| 26 | // we can't use regular timers because they may still be faked |
| 27 | // so we try MessageChannel+postMessage instead |
| 28 | enqueueTaskImpl = function (callback: () => void) { |
| 29 | if (__DEV__) { |
| 30 | if (didWarnAboutMessageChannel === false) { |
| 31 | didWarnAboutMessageChannel = true; |
| 32 | if (typeof MessageChannel === 'undefined') { |
| 33 | console.error( |
| 34 | 'This browser does not have a MessageChannel implementation, ' + |
| 35 | 'so enqueuing tasks via await act(async () => ...) will fail. ' + |
| 36 | 'Please file an issue at https://github.com/facebook/react/issues ' + |
| 37 | 'if you encounter this warning.', |
| 38 | ); |
| 39 | } |
| 40 | } |
| 41 | } |
| 42 | const channel = new MessageChannel(); |
| 43 | channel.port1.onmessage = callback; |
| 44 | channel.port2.postMessage(undefined); |
| 45 | }; |
| 46 | } |
| 47 | } |
| 48 | return enqueueTaskImpl(task); |
| 49 | } |