Getting error: StaticInjectorError(Platform: core)[InjectionToken ToastConfig] in angular 8

Hi Guyz,

Thank you for such a great package.

I have ngx-toastr package installed on my project but I am not using it right now. so I have no export that module in my app component. Once I run the application I am getting this error:

core.js:4002 ERROR Error: Uncaught (in promise): NullInjectorError: StaticInjectorError(AppModule)[InjectionToken ToastConfig]: StaticInjectorError(Platform: core)[InjectionToken ToastConfig]: NullInjectorError: No provider for InjectionToken ToastConfig! NullInjectorError: StaticInjectorError(AppModule)[InjectionToken ToastConfig]: StaticInjectorError(Platform: core)[InjectionToken ToastConfig]:

Once I import:

import { ToastrModule } from 'ngx-toastr';

ToastrModule.forRoot({
      timeOut: 5000,
      positionClass: 'toast-bottom-center',
      preventDuplicates: true,
      closeButton: true,
      progressBar: true,
      maxOpened: 1,
      autoDismiss: true,
      enableHtml: true
    }), 

then that is fine. As I am planning to use in the future. Do I need to import it?