text: // Flags: --experimental-modules
  'use strict';
  const common = require('../common');
  const fixtures = require('../common/fixtures');
  const assert = require('assert');
  const { Worker } = require('worker_threads');
  
  const w = new Worker(fixtures.path('worker-script.mjs'));
  w.on('message', common.mustCall((message) => {
    assert.strictEqual(message, 'Hello, world!');
  }));
  