Angular insist I add standalone = true, despite using Angular 19

My angular config:

@Component({
  selector: 'app-root',
  imports: [RouterOutlet, JsonPipe, HeadComponent],
  templateUrl: './app.component.html',
  styleUrl: './app.component.scss'
})
export class AppComponent {

bootstrapApplication(AppComponent, appConfig)
  .catch((err) => console.error(err));

export const appConfig: ApplicationConfig = {
  providers: [
    provideZoneChangeDetection({ eventCoalescing: true }),
    provideRouter(routes)]
};

But my ide, intellij insists that all components be marked with standalone = true?

Why is that?