Function createWorker

Gulpfile.ts:255–274

(useWorker: boolean)

}

function createWorker(useWorker: boolean): any {
  const numWorkers = Math.ceil(Math.max(cpus().length, 1) / 2) - 1;
  if (
    numWorkers === 0 ||
    !useWorker ||
    // For some reason, on CircleCI the workers hang indefinitely.
    process.env.CIRCLECI
  ) {
    return import("./babel-worker.ts");
  }
  const worker = new JestWorker(new URL("./babel-worker.ts", import.meta.url), {
    enableWorkerThreads: true,
    numWorkers,
    exposedMethods: ["transform"],
  });

  worker.getStdout().pipe(process.stdout);
  worker.getStderr().pipe(process.stderr);
  return worker;
}

async function buildBabel(useWorker: boolean, ignore: PackageInfo[] = []) {
  const worker = await createWorker(useWorker);