Function processTicksAndRejections

lib/internal/process/task_queues.js:72–109

()

}

function processTicksAndRejections() {
  let tock;
  do {
    while ((tock = queue.shift()) !== null) {
      const priorContextFrame =
        AsyncContextFrame.exchange(tock[async_context_frame]);

      const asyncId = tock[async_id_symbol];
      emitBefore(asyncId, tock[trigger_async_id_symbol], tock);

      try {
        const callback = tock.callback;
        if (tock.args === undefined) {
          callback();
        } else {
          const args = tock.args;
          switch (args.length) {
            case 1: callback(args[0]); break;
            case 2: callback(args[0], args[1]); break;
            case 3: callback(args[0], args[1], args[2]); break;
            case 4: callback(args[0], args[1], args[2], args[3]); break;
            default: callback(...args);
          }
        }
      } finally {
        emitDestroy(asyncId);
      }

      emitAfter(asyncId);

      AsyncContextFrame.set(priorContextFrame);
    }
    runMicrotasks();
  } while (!queue.isEmpty() ||
           (hasRejectionToWarn() && processPromiseRejections()));
  setHasTickScheduled(false);
  setHasRejectionToWarn(false);
}

// `nextTick()` will not enqueue any callback when the process is about to
// exit since the callback would not have a chance to be executed.