import{Directive,ElementRef,Input}from'@angular/core';import{fromEvent}from'rxjs';@Directive({selector:'[appToggleBtn]'})exportclassToggleBtnDirective{// used in form Element componentconstructor(privateelement:ElementRef){}ngOnInit(){fromEvent(this.element.nativeElement,'click').subscribe(()=>{//toogle on/offthis.element.nativeElement.classList.toggle('on');});}}