Angular: Unterschied zwischen den Versionen

import { AbstractControl, FormBuilder, FormGroup, ValidatorFn, Validators } from '@angular/forms';
class
{
  angForm: FormGroup;

  constructor(private formBuilder: FormBuilder)
  {
    this.angForm = formBuilder.group({
      email: ['', Validators.required]
    })
  }
}

<input type="text" formControlName="email" [(ngModel)]="useremail"/>

<div *ngIf="angForm.controls['email'].invalid && (angForm.controls['email'].dirty || angForm.controls['email'].touched)">
  <div *ngIf="angForm.controls['email'].errors.required">
  </div>
</div>