javascript - 在 firebase 云函数中拆分 index.js 文件时出错

Question

我尝试将 index.js 文件拆分为多个文件。我想计算数据库引用中的 child 数量。以前我的 index.js 文件是

exports.updateUserBookCount = functions.database.ref('/Users/{userID}/Books/{bookID}')
      .onWrite(async (change,context)=>{

        const collectionRef = change.after.ref.parent;
        const userID = context.params.userID;
        const countRef = admin.database().ref(`/UserInfo/${userID}/usersBooks`);
        console.log("book counter : "+collectionRef);

        const bookList = await collectionRef.once('value');
        return await countRef.set(bookList.numChildren());

      });

我创建了新文件counter.js它是

//counter.js
exports.userBookCount = function(change,context,admin){
    const collectionRef = change.after.ref.parent;
    const userID = context.params.userID;
    const countRef = admin.database().ref(`/UserInfo/${userID}/usersBooks`);
    console.log("book counter : "+collectionRef);

    const bookList = await collectionRef.once('value');
    return await countRef.set(bookList.numChildren());
}

然后我改变了 index.js 像

//index.js
const admin = require('firebase-admin');
admin.initializeApp();
const counter = require('./counter');
exports.updateUserBookCount = functions.database.ref('/Users/{userID}/Books/{bookID}')
      .onWrite(async (change,context)=>{
         counter.userBookCount(change,context,admin);
      });

但是我在部署时遇到in counter.js 9:28 error Parsing error: Unexpected token collectionRef 错误。

Answer 1

我不清楚你的结构，但我猜你只是想能够拆分文件以进行代码组织？如果是这样，我的结构如下:

//index.js
const admin = require('firebase-admin')
const functions = require('firebase-functions')
admin.initializeApp()

const counter = require('./counter.js')

exports.updateUserBookCount = functions.database.ref('/Users/{userID}/Books/{bookID}').onWrite(counter);

//counter.js
const admin = require('firebase-admin')

//This function becomes counter in your index.js - you don't get counter.userBookCount because you have a single export from this file
module.exports = (change, context) => {
  // rest of your logic
}

//If you really want counter.userBookCount because you'll have other functions here, export multiple functions like this:
module.exports = {
  userBookCount: (change, context) => {
    // rest of your logic
  },
  someOtherBookFunction: (change, context) => { ... }
}