javascript - 函数返回未定义、预期的 Promise 或值(value)动机

Question

您好，这个 firebase 函数曾经可以工作，但知道它现在工作时间更长了，我收到此错误消息

Function returned undefined, expected Promise or value

exports = module.exports = functions.analytics.event('first_open').onLog((event) => {
  const payload = {
    notification: {
      title: 'you have a new user \uD83D\uDE43',
      body: event.data.user.deviceInfo.mobileModelName + ' from ' + event.data.user.geoInfo.city + ', ' + event.data.user.geoInfo.country,
      sound:"default",
      vibrate:"true"
    },
  };
   admin.messaging().sendToDevice(deviceToken, payload);
});

Answer 1

更改此:

   admin.messaging().sendToDevice(deviceToken, payload);

对此:

  return admin.messaging().sendToDevice(deviceToken, payload);