Function next

lib/utils.js:669–680

(err)

    fn(arr[i], next);
  }
  function next(err) {
    if (err) {
      const cb = callback;
      callback = noop;
      cb(err);
      return;
    }
    if (++completed !== length) {
      return;
    }
    callback();
  }
}

/**