form.component.ts

@Component({
  selector: 'app-form',
  templateUrl: './form.component.html',
})
export class FormComponent {
  form: FormGroup;
  constructor(private formBuilder: FormBuilder, userService: UserService) {
    this.form = this.formBuilder.group({
      username: ['', Validators.required, [uniqueUserValidator(userService)]],
      email: ['', [Validators.required, Validators.email]],
      password: ['', [Validators.required, Validators.minLength(6)]],
    });
  }
}