Function checkForMessages

lib/internal/modules/esm/worker.js:186–195

* Checks for messages on the syncCommPort and handles them asynchronously.

()

   * Checks for messages on the syncCommPort and handles them asynchronously.
   */
  function checkForMessages() {
    immediate = setImmediate(checkForMessages).unref();
    // We need to let the event loop tick a few times to give the main thread a chance to send
    // follow-up messages.
    const response = receiveMessageOnPort(syncCommPort);

    if (response !== undefined) {
      PromisePrototypeThen(handleMessage(response.message), undefined, errorHandler);
    }
  }

  const unsettledResponsePorts = new SafeSet();