Firebase functions V2: ; SyntaxError: Cannot use import statement outside a module at wrapSafe

I am trying to send notification to device when I receive message in chat in my app. At the moment I just want to read snapshot contents, but when trying to deploy, I am hit with an error: Firebase functions V2: ; SyntaxError: Cannot use import statement outside a module at wrapSafe

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "serve": "firebase serve --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "engines": {
    "node": "20"
  },
  "dependencies": {
    "firebase-admin": "^10.0.2",
    "firebase-functions": "^3.18.0",
    "react-native-notifications": "^5.1.0"
  },
  "private": true
}

I am using Node.js v20 in functions 1st gen. Do you know how to fix this problem?

Thanks!

import { initializeApp } from "firebase-admin/app";
import { getAuth } from "firebase-admin/auth";
import { getDatabase } from "firebase-admin/database";
import { getMessaging } from "firebase-admin/messaging";
import { log, warn } from "firebase-functions/logger";
import { onValueWritten } from "firebase-functions/v2/database";

initializeApp();
const auth = getAuth();
const db = getDatabase();
const messaging = getMessaging();

export const sendPushNotification = onValueWritten("/Chat/{id}", async (event) => {
    const snapshot = event.data.after.val();

    log("SNAP IS");
    log(snapshot);
});

I now get this error with the same code
Function failed on loading user code. This is likely due to a bug in the user code. Error message: Provided module can't be loaded. Is there a syntax error in your code? Detailed stack trace: /workspace/index.js:1 import { initializeApp } from "firebase-admin/app"; ^^^^^^ SyntaxError: Cannot use import statement outside a module at wrapSafe (node:internal/modules/cjs/loader:1378:20) at Module._compile (node:internal/modules/cjs/loader:1428:41) at Module._extensions..js

I have been able to solve the problem by updating the function to V2:

npm install firebase-admin@latest firebase-functions@latest

I then deployed the following using

firebase deploy --only functions

package.json

{
  "name": "functions",
  "description": "Cloud Functions for Firebase",
  "scripts": {
    "serve": "firebase serve --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "engines": {
    "node": "20"
  },
  "dependencies": {
    "firebase-admin": "^13.3.0",
    "firebase-functions": "^6.3.2",
    "react-native-notifications": "^5.1.0"
  },
  "private": true
}

index.js

const { initializeApp } = require("firebase-admin/app");
const { getDatabase } = require("firebase-admin/database");
const { getMessaging } = require("firebase-admin/messaging");
const { onRequest } = require("firebase-functions/v2/https");
const { onValueWritten } = require("firebase-functions/v2/database");

initializeApp();




exports.newChildAddedWritten = onValueWritten("/Chat/{id}", async (event) => {
    const snapshot = event.data.after.val();

    let sender = snapshot.sname; // ...
    let body = snapshot.body;
    let from = snapshot.from;

    const payload = {
        notification: {
            title: sender,
            body: body
        },
        

        data: {
            custom_from: from // cannot use from here as it is reserved
         }
}


 const tokenSnapshot = await getDatabase().ref(`/Users/${snapshot.to}`).once("value");
    const usersData = tokenSnapshot.val();



    let tokens = usersData.tokens;
    
    let filteredTokens = Object.keys(tokens).filter(key => key.length > 10);


    const message = {
        tokens: filteredTokens,
        notification: payload["notification"],
        data: payload["data"]
      };


      
  
      const response = await getMessaging().sendEachForMulticast(message);
      console.log(`Successfully sent messages: ${response.successCount}`);
      if (response.failureCount > 0) {

        response.responses.forEach((resp, idx) => {
            if (!resp.success) {
              console.log("CURR-TOKEN: " + tokens[idx]);
              console.error(`Error code: ${resp.error.code}`);
              console.error(`Error message: ${resp.error.message}`);
            }
          });


        console.log(`Failed to send messages: ${response.failureCount}`);
      }

});