[6.3.3] can't do initializeApp, crash with Firebase service named 'database' already registered (app/duplicate-service)

[flelirzin]

A maintenance script used for long time worked well with former versions incl. [email protected]

When upgrading to 6.3.3, it crashes with

(node:19464) UnhandledPromiseRejectionWarning: FirebaseError: Firebase: Firebase service named 'database' already registered (app/duplicate-service).
    at Object.registerService (C:\dev\ng\backend\node_modules\@firebase\app\dist\index.node.cjs.js:359:33)
    at registerDatabase (C:\dev\ng\backend\node_modules\firebase-admin\node_modules\@firebase\database\dist\index.node.cjs.js:15245:39)
    at Object.<anonymous> (C:\dev\ng\backend\node_modules\firebase-admin\node_modules\@firebase\database\dist\index.node.cjs.js:15268:5)
    at Module._compile (module.js:653:30)

Downgrading to 6.3.2, good again.

It crashes very early at the admin.initializeApp(...). Put some console.log to ensure is is called only once.

Imported packages in the script are:

import firebase from "firebase/app";
import "firebase/auth";
import "firebase/database";
import "firebase/firestore";
import "firebase/storage";
import "firebase/functions";
import admin from "firebase-admin";

Win10, node 8

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[Feiyang1]

Thanks for reporting this! We recently removed @firebase/app from firebase-admin to solve a version conflict when firebase-admin and firebase are used together.

You are getting this error because you have import "firebase/database" and firebase-admin also import "firebase/database".
You can remove your import "firebase/database" statement and it should solve the problem.

[flelirzin]

Thanks a lot, it is the solution. Works again great !