test/fixtures/worker-preload.js - external/github.com/v8/node - Git at Google

 const {
   Worker,
   workerData,
   threadId
 } = require('worker_threads');

 if (threadId < 2) {
   new Worker('1 + 1', { eval: true });
 }
	const {
	Worker,
	workerData,
	threadId
	} = require('worker_threads');

	if (threadId < 2) {
	new Worker('1 + 1', { eval: true });
	}