Problem with integrating Firebase in Cocos Creator

I am trying to integrate Firebase in Cocos Creator (v 2.4.3)

Does anyone know what the best approach to this is? I am targeting the web platform.

-NPM
I have tried using npm to integrate Firebase by following this blog,
but when I tried to import firebase in a script,

import * as firebase from 'firebase/app';
import "firebase/auth";

I get this error:

SyntaxError: ‘import’ and ‘export’ may only appear at the top level (2:0) while parsing C:/CocosProjects/firebaseTest3/node_modules/@firebase/auth/dist/auth.esm.js

If I comment out the 2nd line,

import * as firebase from 'firebase/app';
//import "firebase/auth";

I still get this error:

Error: Parsing file C:\CocosProjects\firebaseTest3\node_modules\firebase\app\dist\index.esm.js: ‘import’ and ‘export’ may only appear at the top level

-SDKBOX
I then tried to integrate Firebase using sdkbox from the Cocos Creator Extension Store, but when I launch sdkbox, Import and Update buttons are greyed out with this error:

Please build project before import plugins!

even though I already made a build for the empty scene

if anyone knows what I am doing wrong, please reply

I figured it out, it seems that the newer version of Firebase had some issues according to this

After reinstalling an older version of Firebase, it worked!

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