import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { CounterService } from '../services/counter.service';
import { CounterComponent } from '../counter/counter.component';
@NgModule({
  imports: [ CommonModule],
  providers: [CounterService],
  declarations: [  CounterComponent ],
  exports: [CounterComponent]
})
export class SomeOtherModule { }

import { SomeOtherModule } from './some-other/some-other.module';
        @NgModule({
          declarations: [
            AppComponent,
            HomeComponent,
            CounterComponent,
    ],
      imports: [SomeOtherModule,
        RouterModule.forRoot([
          { path: '', component: HomeComponent, pathMatch: 'full' },
          { path: 'counter', component: CounterComponent },
     ])]