} from './components/hello-world/hello-world.component'; import { PanelComponent } from './components/panel/panel.component'; import { ModuleWithProviders } from '@angular/core'; import { Routes, RouterModule } from '@angular/router'; const appRoutes: Routes = [ path: 'parent', component: ParentComponent, children: [ { path: 'hello', component: HelloWorldComponent, }, { path: 'panel', component: PanelComponent, } ] } ]; export const routing: ModuleWithProviders = RouterModule.forRoot(appRoutes);