Directive require 'formControlName' / 'formGroupName' / 'formGroup' etc. (but not use any) | Angular Community | Page 1

I am making a directive that sets 'attr.error' through @HostBinding if the injected ngControl status is valid while listening to injected ngForm submit event.
'attr.error' is essentially passing the error state to a webcomponent (have to use), empty string = no error displayed etc. on webcomponent.
I don't really have a use for formControlName / formGroupName / formGroup as @Input({required: true}) but it would be nice to have typescript throw a fit if this directive was used on an element where these don't exist. Any idea how I can force those as required but not use them? Or any suggestions if I should do something different here. Thanks!

Here is my component which is working right now:

import { Directive, HostBinding, inject, Input, OnDestroy, OnInit } from '@angular/core';
import { ControlContainer, NgControl, NgForm } from '@angular/forms';
import { EMPTY, iif, Subscription, tap } from 'rxjs';

@Directive({
  selector: '[appDynamicControlError]',
  standalone: true
})
export class DynamicControlErrorDirective implements OnInit, OnDestroy{
  @Input({required: true}) suppliedErrorText!: string;
  @HostBinding('attr.error')
  get errorText() {
    return this.errorString;
  }
  set errorMessageSet(message: string) {
    this.errorString = message;
  }
  private errorString = '';
  private ngControl = inject(NgControl, {self: true, optional: true}) || inject(ControlContainer, {self: true});
  private ngForm = inject(ControlContainer, {skipSelf: true}).formDirective as NgForm;

  private submitSubscriber!: Subscription;

  ngOnInit(): void {
    this.submitSubscriber = iif(() => !!this.ngForm, this.ngForm.ngSubmit, EMPTY)
      .pipe(
        tap(() => {
          if (this.ngControl.status !== 'VALID') {
            this.errorMessageSet = this.suppliedErrorText;
          } else {
            this.errorMessageSet = '';
        }})
      ).subscribe();
  }

  ngOnDestroy(): void {
      this.submitSubscriber.unsubscribe();
  }
}

#Directive require 'formControlName' / 'formGroupName' / 'formGroup' etc. (but not use any)