Firebase函数onWrite返回undefined event.data

Question

我的firebase函数正在触发onWrite但它的事件没有数据。

我的功能索引文件

var functions = require('firebase-functions');
var admin = require('firebase-admin');
admin.initializeApp();
var firestore = admin.firestore();
var logInLogOutListner = require('./logInLogOutListner');



exports.listenForLogInLogOut = database.ref('/message')
    .onWrite((event,context) => {

     console.log("data:"+event.data+"event:"+event);

      if (!event.data.exists()) {
        return;
      }

        logInLogOutListner.listenForLogInLogOut(firestore, event.data);

return null;

 });

Firebase功能日志

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