Angular 4 IE11 Polyfills

ie11-angular4-polyfills.ts

let event;
if (document.createEvent) {
  // IE11 - dispatch event doesn't support Event
  event = document.createEvent('Event');
  event.initEvent('input', true, true);
} else {
  // Chrome
  event = new Event('input');
}
this.el.nativeElement.dispatchEvent(event);