ng_for_in-1.ts

@Directive({
  selector: '[ngFor][ngForIn]'
})
export class NgForIn extends NgFor implements OnChanges {

  @Input() ngForIn: any;

  constructor(viewContainer: ViewContainerRef,
              template: TemplateRef<NgForRow>,
              differs: IterableDiffers,
              cdr: ChangeDetectorRef) {

    super(viewContainer, template, differs, cdr);
  }

  ngOnChanges(changes: SimpleChanges): void {
    // Do something here
  }

}