const { Worker } = require('worker_threads');

const w = new Worker(`
  const { parentPort } = require('worker_threads');
  parentPort.on('message', () => {
    const sharedArrayBuffer = new SharedArrayBuffer(12);
    parentPort.postMessage(sharedArrayBuffer);
  });
`, { eval: true });

w.unref();

w.once('message', () => {
  console.log('done');
});

w.postMessage('go');