如何避免Angular 2表单中的代码重复？

我的所有反应形式通常包括属性和方法:

  @Input()
  public form: FormGroup;

  public messages = VALIDATION_MESSAGES;

  @Output()
  public onFormSubmit: EventEmitter = new EventEmitter();

  @Input()
  public formData;

  @Input()
  public controlsConfig: any;

  protected abstract fb: FormBuilder;

  isValidControl(controlName: string): boolean {
    const control = this.form.controls[controlName];
    return control.valid || control.pristine;
  }
  onSubmit(): void {
    const form = this.form;

    if(form.valid) {
      this.onFormSubmit.emit(form.value);
    }
  }

export abstract class BaseReactiveForm {..}

@Component({
  selector: 'app-login-form',
  templateUrl: './login-form.component.html',
  styleUrls: ['./login-form.component.css']
})
export class LoginFormComponent extends BaseReactiveForm implements OnInit {

  constructor(protected fb: FormBuilder) {
    super();
  }
...}