angular: ERROR in Error encountered resolving symbol values statically WITH functions exported.

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Current behavior Consider following module:

export function angularHttpFactory(backend: XHRBackend, defaultOptions: RequestOptions): Http {
  return new Http(backend, defaultOptions);
}

export function authHttpFactory(auth: Auth, backend: XHRBackend, defaultOptions: RequestOptions): AuthHttp {
  return new AuthHttp(auth, backend, defaultOptions);
}

@NgModule({
  declarations: [LoginLoaderComponent],
  imports: [CommonModule, HttpModule, Ng2Webstorage],
  exports: [LoginLoaderComponent]
})
export class AuthModule {
  static forRoot(authConfig: AuthConfig): ModuleWithProviders {
    return {
      ngModule: AuthModule,
      providers: [
        { provide: AUTH_CONFIG, useValue: authConfig },
        { provide: ANGULAR_HTTP, useFactory: angularHttpFactory, deps: [XHRBackend, RequestOptions] },
        Auth,
        { provide: Http, useFactory: authHttpFactory , deps: [Auth, XHRBackend, RequestOptions] },
        AuthUser
      ]
    };
  }

  static forChild(): ModuleWithProviders {
    return {
      ngModule: AuthModule
    };
  }
}

Following error occurs when importing npm package with above module definition: ERROR in Error encountered resolving symbol values statically. Calling function ‘AuthModule’, function calls are not supported. Consider replacing the function or lambda with a reference to an exported function, resolving symbol AppModule in C:/Users/jacek_dauth3h/Documents/dev/action-center-web-app/src/app/app.module.ts, resolving symbol AppModule in C:/Users/jacek_dauth3h/Documents/dev/action-center-web-app/src/app/app.module.ts

Expected behavior No error.

• Angular version: 2.4.3

• Angular CLI version: 1.0.0-beta.24

• Browser: all

• Language: TypeScript 2.1.4

• Node (for AoT issues): node --version = v6.9.4