message: docs: make toggleImage arguments optional in AngularJS quick reference
  PR Close
diff: @@ -20,7 +20,7 @@ export class AppComponent {
  movies: IMovie[] = [];
  showImage = true;
  title = 'AngularJS to Angular Quick Ref Cookbook';
  - toggleImage(event: UIEvent) {
  + toggleImage(event?: UIEvent) {
  this.showImage = !this.showImage;
  this.eventType = (event && event.type) || 'not provided';
  }
  