Nest can't resolve dependencies of the UserService (?, +). Please make sure that the argument at index [0] is available in the current context

Question

having some problems, di/circular-references I'm sure I'm doing wrong, I just can't see it.

Any help would be much appreciated

user.module.ts

@Module({
    imports: [
        TypeOrmModule.forFeature([User]),
        forwardRef(() => AuthModule)
    ],
    providers: [ UserService, TokenService ],
    exports: [ UserService ]
})
export class UserModule {}

auth.module.ts

@Module({
    imports: [ forwardRef(() => UserModule) ],
    controllers: [ AuthController ],
    providers: [
        AuthService,
        UserService,
        TokenService
    ],
    exports: [ AuthService, TokenService ]
})
export class AuthModule {}

app.module.ts

@Module({
  imports: [
    TypeOrmModule.forRoot(),
    forwardRef(() => UserModule),
    forwardRef(() => AuthModule),
  ],
})
export class AppModule {}

I get [ExceptionHandler] Cannot read property 'module' of undefined.

Was originally having "Nest can't resolve dependencies of the UserService. I then deleted the UserModule entirely and just used the AuthModule, everything worked, then decided to add the UserModule back in today and move the code from AuthModule back into the UserModule, then discovered the forwardRef(() => ) and now I'm getting the cannot read property 'model'.

Thanks in advance

I've tried different things, that's the state that I ended up with a different error. — Diego Antunes, Aug 05 '18 at 21:52

Kim Kern · Accepted Answer · 2018-08-05T12:43:43.567

You need to inject the (circular) dependencies of the UserService via forwardRef as well, see the CommonService example:

constructor(@Inject(forwardRef(() => TokenService)) private readonly tokenService: TokenService) {}

Also, providers should only be declared in one module. If you want to use them in another module, export those providers and then just import the module: UserModule imports AuthModule and does not provide the AuthService again. This way all exported providers can be used in the UserModule.

So, remove the UserService from the AuthModule's providers list and the TokenService from the UserModule.

In the docs they pointed to use one and not them combined – Mohammad ARZ Jun 10 '23 at 11:06 — Mohammad ARZ, Jun 10 '23 at 11:06

Sathishkumar Rakkiyasamy · Answer 2 · 2021-09-09T17:26:10.150

4

In case, you got above error when adding the repository to the service with TypeORM, then add below code in the module file

imports: [
  TypeOrmModule.forFeature([<your-entity>])
],

edited Sep 09 '21 at 17:26

answered May 16 '20 at 06:32

Sathishkumar Rakkiyasamy

3,509
2
30
34

score 0 · Answer 3 · answered Aug 09 '20 at 15:11

0

I got error when I have 2 consecutive commas in providers of my array

  providers: [
    AService,
    BService,, // <- NOT ALLOWED CIRCULAR PROBLEM 
  ],

answered Aug 09 '20 at 15:11

Chetan Jain

236
6
16

2

You can use tools like prettier, eslint/tslint to avoid this – Jeremiah Sep 08 '21 at 14:17

Nest can't resolve dependencies of the UserService (?, +). Please make sure that the argument at index [0] is available in the current context

3 Answers3