我正在一个Flutter项目中实现push-notifications。我希望Firebase函数在数据库中的某个collection发生更改时触发通知。
使用JavaScript编写函数。Node version: 16

复制：

步骤1：firebase init functions
第二步：? Please select an option: Use an existing project
步骤3：? Select a default Firebase project for this directory: my-project-1 (my-project-1)
第四步：? What language would you like to use to write Cloud Functions? JavaScript
第五步：? Do you want to use ESLint to catch probable bugs and enforce style? Yes
第6步：index.js的JavaScript代码

const functions = require('firebase-functions');
const admin = require('firebase-admin');

admin.initializeApp();

// fcm notification
exports.sendNotification = functions.firestore
  .document("rooms/{roomId}/")
  .onWrite(async(change, context) => {

    const payload = {
      "notification":{
        "title": "Firebase messaging",
        "body": "A message",
      },
    };
    const options = {};
    return admin.messaging().sendToDevice('TOKEN-ID', payload, options);
  });

步骤7：npm run deploy
当部署到firebase时，这是返回的错误：

9:34  error  Parsing error: Unexpected token =>

✖ 1 problem (1 error, 0 warnings)

Error: functions predeploy error: Command terminated with non-zero exit code 1
noname@inoname functions % npm run deploy

这就是包。json：

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "lint": "eslint .",
    "serve": "firebase emulators:start --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "engines": {
    "node": "16"
  },
  "main": "index.js",
  "dependencies": {
    "firebase-admin": "^10.0.2",
    "firebase-functions": "^3.18.0"
  },
  "devDependencies": {
    "eslint": "^8.9.0",
    "eslint-config-google": "^0.14.0",
    "firebase-functions-test": "^0.2.0"
  },
  "private": true
}