<vdr-dropdown>
  <button class="btn btn-outline" vdrDropdownTrigger>
      <clr-icon shape="plus"></clr-icon>
      Select type
  </button>
  <vdr-dropdown-menu vdrPosition="bottom-left">
    <button
      *ngFor="let typeName of allTypes"
      type="button"
      vdrDropdownItem
      (click)="selectType(typeName)"
    >
      typeName
    </button>
  </vdr-dropdown-menu>
</vdr-dropdown>

class DropdownComponent {
  isOpen = false;
  public public trigger: ElementRef;
  @Input() @Input() manualToggle = false;
  onClick() => ;
  toggleOpen() => ;
  onOpenChange(callback: (isOpen: boolean) => void) => ;
  setTriggerElement(elementRef: ElementRef) => ;
}