Firebase函数：未定义函数

Question

在index.js，我有：

exports.makeUppercase = functions.database.ref('/messages/{pushId}/original').onCreate((snapshot, context) => {
  // Grab the current value of what was written to the Realtime Database.
  const original = snapshot.val();
  console.log('Uppercasing', context.params.pushId, original);
  const uppercase = original.toUpperCase();
  // You must return a Promise when performing asynchronous tasks inside a Functions such as
  // writing to the Firebase Realtime Database.
  // Setting an "uppercase" sibling in the Realtime Database returns a Promise.
  return snapshot.ref.parent.child('uppercase').set(uppercase);
});

我从以下地方复制粘贴了代码：https://firebase.google.com/docs/functions/get-started

不知何故，当我使用

firebase deploy --only functions

我得到：

错误：html" target="_blank">分析函数触发器时出错。ReferenceError:未在对象上定义函数。（/home/[USERNAME HERE]/functions/index.js:1:87）在模块中_在对象处编译（module.js:643:30）。模块_扩展。。js（module.js:654:10）在模块中。在函数tryModuleLoad（module.js:499:12）处加载（module.js:556:32）。模块_在模块处加载（module.js:491:3）。require（module.js:587:17）at require（internal/module.js:11:18）at/usr/local/nvm/versions/node/v8。9.4/lib/node_modules/firebase-tools/lib/triggerParser。js:21:11目标。（/usr/local/nvm/versions/node/v8.9.4/lib/node_modules/firebase tools/lib/triggerParser.js:75:3）

发生了什么，我该怎么解决？

Answer 1

正如安装文档所解释的，您需要导入所需的模块并初始化应用程序：

// The Cloud Functions for Firebase SDK to create Cloud Functions and setup triggers.
const functions = require('firebase-functions');

// The Firebase Admin SDK to access the Firebase Realtime Database.
const admin = require('firebase-admin');
admin.initializeApp();