app.component.ts

import { Component } from '@angular/core';
import { FormGroup, Validators, FormsModule, FormControl } from '@angular/forms';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  form = new FormGroup({
    myField: new FormControl('', Validators.required)
  });

  get myField() { return this.form.get('myField'); }
}