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?



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