I recently created a new Angular 18 project, and I decided to use the standalone component approach. However, in my IntelliJ IDEA editor, I keep encountering the following error underlined in AppComponent.ts AppComponent is not declared in any Angular module. import { Component } from '@angular/core'; @Component({ selector: 'app-root', standalone: true, templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { title = 'test'; } The application works fine when I run it using ng serve. However, the IntelliJ IDEA editor keeps showing the error: AppComponent is not declared in any Angular module. What I’ve Tried: Restarting IntelliJ and the TypeScript service. Invalidating caches in IntelliJ. My Question: Is this error expected when using standalone components in Angular 17/18? If so, how can I resolve it, or is this simply a bug or misconfiguration in IntelliJ IDEA? Do I need to configure anything extra for Angular’s standalone components in IntelliJ? Continue reading...