For example: i have a root module and 2 children AuthModule and UsersModule.

RootModule:

@Module({
  imports: [
    AuthModule,
    PrismaModule,
    ConfigModule.forRoot({ isGlobal: true }),
    UsersModule,
  ],
  controllers: [],
  providers: [
    {
      provide: APP_PIPE,
      useClass: ValidationPipe,
    },
  ],
})

AuthModule:

@Global()
@Module({
  imports: [
    JwtModule.register({
      global: true,
      secret: process.env.JWT_SECRET_KEY || "secret key",
      signOptions: { expiresIn: "2d" },
    }),
  ],
  controllers: [AuthController],
  providers: [AuthService, JwtStrategy],
  exports: [AuthService],
})

UsersModule:

@Global()
@Module({
  controllers: [UsersController],
  providers: [UsersService],
  exports: [UsersService],
})

I am using the AuthService provider from AuthModule to UsersModule:

@Injectable()
export class UsersService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly authService: AuthService,
  ) {}
}

And i get en error:

Error: Nest can’t resolve dependencies of the UsersService (PrismaService, ?). Please make sure that the argument dependency at index [1] is available in the UsersModule context.

I created mockservice and export it from AuthModule and it works! I don’t understand what the problem with this service…

If the problem is cyclical dependency, then how do I solve it from an architectural point of view?

Dependencies in AuthService:

@Injectable()
export class AuthService {
  constructor(
    private readonly usersService: UsersService,
    private readonly jwtService: JwtService,
  ) {}
}