Angular 5 Http Interceptors error when injecting service

Question

I am receiving the following strange dependency injection behavior when using custom HttpInterceptors in angular 5+.

The following simplified code works fine:

Answer 1

For me @Benjineer answar helped to provide as a dependency in app.module.ts the required sercvice.

Although what is interensting, in the order you add as a dependency in app.module.ts you get it in the constructor of the service.

For Example: in the app module you provide in the order of AuthService, ErroMsgService

deps: [AuthService, ErrorMsgService]

in the HttpInterceptor constructor you have to create them in the same order

 constructor(
    private authService: AuthService,
    private errorService: ErrorMsgService
    ) {}