Handle ngOnInit error in parent of lazy-loaded module

[urban sundial]

I have a non-router lazy loaded module and component that may throw an error in the ngOnInit lifecycle hook. How can I make the parent component that loads the module and component with a portal aware of the error so it can display a more meaningful error?

[hidden needle]

Why wouldn't that be the responsibility of the Component that has the error?
But you can make a Service that you tell when an Error happens, and a component that listens for Errors from the Service.

@Injectable({ providedIn: 'root' })
export class ErrorAlertService {
  public readonly error$: Observable<string>;

  private readonly _errorSub$: Subject<string>;

  constructor() {
    this._errorSub$ = new Subject<string>();

    this.error$ = this._errorSub$.asObservable();
  }

  public clearError(): void {
    this._errorSub$.next('');
  }

  public setError(msg: string): void {
    this._errorSub$.next(msg);
  }
}

@Component({
  template: `
<div *ngIf="error$ | async as errorMsg" class="alert alert-danger">
  <button (click)="close()" class="btn-close icon-font" type="button">
    close
  </button>
  {{ errorMsg }}
</div>
`,
})
export class ErrorAlertComponent {
  public readonly error$: Observable<string>;

  constructor(private readonly service: ErrorAlertService) {
    this.error$ = this.service.error$;
  }

  public close(): void {
    this.service.clearError();
  }
}

[urban sundial]

The reason I want to make a more general component handle the error is because it's lazy loading one of around 100 different components, and I want to handle failures for when the oninit lifecycle hook fails for whichever component ends up getting loaded. I have spent far too much time trying to code that into a fraction of the components, since they all need to communicate back to the parent that lazy-loads them.