From Angular 6.1, you can now avoid the hassle and pass extraOptions to your RouterModule.forRoot() as a second parameter and can specify

 scrollPositionRestoration: enabled

  to tell Angular to scroll to top whenever the route changes.

@NgModule({
  imports: [
    RouterModule.forRoot(routes, {
      scrollPositionRestoration: 'enabled',
    })
  ],
  ...

Angular Official Docs

From Angular 6.1, you can now avoid the hassle and pass extraOptions to your RouterModule.forRoot() as a second parameter and can specify  scrollPositionRestoration: enabled to tell Angular to scroll to top whenever the route changes.

By default you will find this in app-routing.module.ts:

const routes: Routes = [
  {
    path: '...'
    component: ...
  },
  ...
];

@NgModule({
  imports: [
    RouterModule.forRoot(routes, {
      scrollPositionRestoration: 'enabled', // Add options right here
    })
  ],
  exports: [RouterModule]
})
export class AppRoutingModule { }

Angular Official Docs

In Angular 6.1, you can now avoid the hassle and pass extraOptions to your RouterModule.forRoot() as a second parameter and can specify

scrollPositionRestoration: enabled

to tell Angular to scroll to top whenever the route changes.

@NgModule({
  imports: [
    RouterModule.forRoot(routes, {
      scrollPositionRestoration: 'enabled',
    })
  ],
  ...

Angular Official Docs

From Angular 6.1, you can now avoid the hassle and pass extraOptions to your RouterModule.forRoot() as a second parameter and can specify

scrollPositionRestoration: enabled

to tell Angular to scroll to top whenever the route changes.

@NgModule({
  imports: [
    RouterModule.forRoot(routes, {
      scrollPositionRestoration: 'enabled',
    })
  ],
  ...

Angular Official Docs