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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';
import fclone from 'fclone';
const isWorkerThread = () => {
try {
// `Require` here to support Node v10
const {isMainThread, parentPort} = require('worker_threads');
return !isMainThread && parentPort;
} catch {
return false;
}
};
const messageParent = (
message: unknown,
parentProcess: NodeJS.Process = process,
): void => {
try {
const nonCircularMessage = fclone(message);
if (isWorkerThread()) {
// `Require` here to support Node v10
const {parentPort} = require('worker_threads');
parentPort.postMessage([PARENT_MESSAGE_CUSTOM, nonCircularMessage]);
} else if (typeof parentProcess.send === 'function') {
parentProcess.send([PARENT_MESSAGE_CUSTOM, nonCircularMessage]);
}
} catch {
throw new Error('"messageParent" can only be used inside a worker');
}
};
export default messageParent;