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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',
    })
  ],
  ...

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