// app.module.ts
import { Module } from '@nestjs/common';
import { FirebaseModule } from 'nest-firebase';

@Module({
  imports: [FirebaseModule.forRoot({
    /// firebase configuration see https://firebase.google.com/docs/admin/setup#initialize-sdk
  })]
})

// <your-module>.module.ts
import { Module } from '@nestjs/common';
import { FirebaseModule } from 'nest-firebase';
@Module({
  imports: [
    FirebaseModule.forFeature({
      auth: true,
      // has other options like firestore, database etc.
    }),

  ],
  ...
})
export class UserModule {}

// <your-module>.service.ts
import { Injectable } from '@nestjs/common'
import { Auth } from 'firebase-admin/auth'

import { InjectFirebaseService } from 'nest-firebase'

@Injectable()
export class UserService {
  constructor(
    @InjectFirebaseService('auth') private readonly firebaseAuthService: Auth,
  ) {}

  // your services
}

import { Auth } from 'firebase-admin/auth'
import { Database } from 'firebase-admin/database'
import { Firestore } from 'firebase-admin/firestore'
import { InjectFirebaseService } from 'nest-firebase'
import { Injectable } from '@nestjs/common'

@Injectable()
export class ExampleService {
  constructor(
    // Firebase Authentication
    @InjectFirebaseService('auth')
    private readonly firebaseAuthService: Auth,
    // Firebase Realtime Database
    @InjectFirebaseService('database')
    private readonly firebaseDatabaseService: Database,
    // Firebase Cloud Firestore
    @InjectFirebaseService('firestore')
    private readonly firebaseFirestoreService: Firestore,
  ) {}

  // your services
}