Nest.js can't resolve dependencies

Question

I am trying to use ConfigService in my users.module.ts but I am getting an

Error: Nest can't resolve dependencies of the UsersService (UserRepository, HttpService, ?). Please make sure that the argument ConfigService at index [2] is available in the UsersModule context.

Potential solutions:

• If ConfigService is a provider, is it part of the current UsersModule?
• If ConfigService is exported from a separate @Module, is that module imported within UsersModule?

I have imported the ConfigModule in my UsersModule but still its not working :(

app.module.ts

@Module({
  imports: [
    ConfigModule.forRoot({
      expandVariables: true,
    }),
    TypeOrmModule.forRoot(),
    UsersModule,
    AuthModule,
  ],
  controllers: [AppController],
  providers: [AppService],
})

export class AppModule {}

users.module.ts

import { ConfigModule } from '@nestjs/config';

@Module({
  imports: [ConfigModule, HttpModule, TypeOrmModule.forFeature([User])],
  controllers: [UsersController],
  providers: [UsersService],
  exports: [UsersService],
})

export class UsersModule {}

users.service.ts

export class UsersService {

 constructor(
    @InjectRepository(User)
    private readonly userRepository: Repository<User>,
    private readonly httpService: HttpService,
    private readonly configService: ConfigService,
  ) {}

}

Answer 1

You would still have to declare ConfigService in the providers of users.module.ts. Refer example below.

app.module.ts

@Module({
  imports: [
    ConfigModule.forRoot({
      expandVariables: true,
    }),
    TypeOrmModule.forRoot(),
    UsersModule,
    AuthModule,
  ],
  controllers: [AppController],
  providers: [AppService],
})

export class AppModule {}

users.module.ts

import { ConfigModule } from '@nestjs/config';

@Module({
  imports: [ConfigModule, HttpModule, TypeOrmModule.forFeature([UserRepository])],
  controllers: [UsersController],
  providers: [UsersService, ConfigService],
  exports: [UsersService],
})

export class UsersModule {}

Hope this helps.

Thanks.