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messageParent.ts
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messageParent.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import {PARENT_MESSAGE_CUSTOM} from '../types';
const isWorkerThread: boolean = (() => {
try {
// `Require` here to support Node v10
const {isMainThread, parentPort} =
require('worker_threads') as typeof import('worker_threads');
return !isMainThread && parentPort != null;
} catch {
return false;
}
})();
export default function messageParent(
message: unknown,
parentProcess = process,
): void {
if (isWorkerThread) {
// `Require` here to support Node v10
const {parentPort} =
require('worker_threads') as typeof import('worker_threads');
// ! is safe due to `null` check in `isWorkerThread`
parentPort!.postMessage([PARENT_MESSAGE_CUSTOM, message]);
} else if (typeof parentProcess.send === 'function') {
parentProcess.send([PARENT_MESSAGE_CUSTOM, message]);
} else {
throw new Error('"messageParent" can only be used inside a worker');
}
}