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'use strict'; const common = require('../common'); const assert = require('assert'); const { Worker, parentPort } = require('worker_threads'); // Do not use isMainThread so that this test itself can be run inside a Worker. if (!process.env.HAS_STARTED_WORKER) { process.env.HAS_STARTED_WORKER = 1; const w = new Worker(__filename); const expectation = [ 4, undefined, null ]; const actual = []; w.on('message', common.mustCall((message) => { actual.push(message); if (actual.length === expectation.length) { assert.deepStrictEqual(expectation, actual); w.terminate(); } }, expectation.length)); w.postMessage(2); } else { parentPort.onmessage = common.mustCall((message) => { parentPort.postMessage(message.data * 2); parentPort.postMessage(undefined); parentPort.postMessage(null); }); }