structural directive with elementRef

import {
  Directive,
  Renderer2,
  TemplateRef,
  ViewContainerRef,
  Input
} from '@angular/core';

@Directive({
  selector: '[appMy]'
})
export class MyDirective {
  constructor(
  private templateRef: TemplateRef<any>,
  private viewContainer: ViewContainerRef,
  private renderer: Renderer2) { }
  @Input() set appMy(condition: boolean) {
   if (condition) {
     const view = this.viewContainer.createEmbeddedView(this.templateRef);
     this.renderer.addClass(view.rootNodes[0], 'myclass');
   } else  {
     this.viewContainer.clear();
   }
  }
}