backend/libs/common/src/firebase/firebase.config.ts

import { initializeApp } from 'firebase/app';
import { getDatabase } from 'firebase/database';
import { ConfigService } from '@nestjs/config';

export const initializeFirebaseApp = (configService: ConfigService) => {
  const firebaseConfig = {
    apiKey: configService.get<string>('FIREBASE_API_KEY'),
    authDomain: configService.get<string>('FIREBASE_AUTH_DOMAIN'),
    projectId: configService.get<string>('FIREBASE_PROJECT_ID'),
    storageBucket: configService.get<string>('FIREBASE_STORAGE_BUCKET'),
    messagingSenderId: configService.get<string>(
      'FIREBASE_MESSAGING_SENDER_ID',
    ),
    appId: configService.get<string>('FIREBASE_APP_ID'),
    measurementId: configService.get<string>('FIREBASE_MEASUREMENT_ID'),
    databaseURL: configService.get<string>('FIREBASE_DATABASE_URL'),
  };

  const app = initializeApp(firebaseConfig);
  return getDatabase(app);
};

export const firebaseDataBase = (configService: ConfigService) =>
  initializeFirebaseApp(configService);