Nest: APP_GUARD

Created on 4 Jul 2018 · 5Comments · Source: nestjs/nest

Hi All,
I'm using a global AuthGuard, I need to inject my auth-service to the AuthGuard constructor

`@Module({
imports: [AuthModule, UsersModule],
providers: [
{
provide: APP_GUARD,
useClass: AuthGuard,
},
],
})

@Injectable()
export class AuthGuard implements CanActivate {
constructor(private readonly authService: AuthService) { }

I get

Error: Nest can't resolve dependencies of the APP_GUARD (?). Please verify whether [0] argument is available in the current context.
at Injector.lookupComponentInExports (/Users/dekely/dev/NestJS-Starter/node_modules/@nestjs/core/injector/injector.js:129:19)
at process._tickCallback (internal/process/next_tick.js:68:7)
at Function.Module.runMain (internal/modules/cjs/loader.js:746:11)
at startup (internal/bootstrap/node.js:238:19)

question 🙌

Source

dyaacov

Most helpful comment

@dyaacov show your repo

can you explain why of course, because if you would like to use a service outside from a module, you just have to export it, just it. Treat module it like a black box, if you don't make any whole for in, you won't be able to take anything from inside. This is what exports are for.

cojack on 4 Jul 2018

👍2

All 5 comments

The AuthModule export the AuthService ?

adrien2p on 4 Jul 2018

No, should he? can you explain why

when I export it I get different error:
`
(node:32503) UnhandledPromiseRejectionWarning: Error: Nest cannot find given element (it does not exist in current context)
at NestApplicationContext.findInstanceByPrototypeOrToken (/Users/dekely/dev/NestJS-Starter/node_modules/@nestjs/core/nest-application-context.js:70:19)
at NestApplicationContext.find (/Users/dekely/dev/NestJS-Starter/node_modules/@nestjs/core/nest-application-context.js:38:21)
at NestApplicationContext.get (/Users/dekely/dev/NestJS-Starter/node_modules/@nestjs/core/nest-application-context.js:32:25)
at eval (webpack:///./src/server.ts?:19:70)
at Generator.next ()
at fulfilled (webpack:///./src/server.ts?:4:58)