spinner.directive.ts

@Directive({ selector: '[isReady]' })
export class ReadyDirective implements OnInit {
  @Input('isReady') isReady: boolean;

  constructor(
    private templateRef: TemplateRef<void>,
    private vcr: ViewContainerRef
  ) {}

  ngOnInit() {
    if (this.isReady) {
      this.vcr.createEmbeddedView(this.templateRef);
    }
    if (!this.isReady) {
      this.vcr.createComponent(SpinnerComponent);
    }
  }
}