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denoland-deno/tests/specs/node/worker_threads/auto_exits.mjs

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JavaScript

import { isMainThread, parentPort, Worker } from "node:worker_threads";
function onMessageOneshot() {
console.log("Got message from main thread!");
parentPort.off("message", onMessageOneshot);
}
if (isMainThread) {
// This re-loads the current file inside a Worker instance.
const w = new Worker(import.meta.filename);
setTimeout(() => {
w.postMessage("Hello! I am from the main thread.");
}, 500);
} else {
console.log("Inside Worker!");
console.log(isMainThread); // Prints 'false'.
parentPort.on("message", onMessageOneshot);
}