export function runWorker(path: string, cb: WorkerCallback, workerData: object | null = null) { const worker = new Worker(path, { workerData });

worker.on('message', cb.bind(null, null)); worker.on('error', cb);

worker.on('exit', (exitCode) => { if (exitCode === 0) { return null; }

   return cb(new Error(`Worker has stopped with code ${exitCode}`));
 });

 return worker;