Refactor #1451 - For Dropdown

src/components/dropdown/Dropdown.d.ts

@@ -1,4 +1,5 @@
 import { VNode } from 'vue';
+import { VirtualScrollerProps } from '../virtualscroller';
 
 interface DropdownProps {
     modelValue?: any;
@@ -28,6 +29,7 @@ interface DropdownProps {
     panelClass?: string;
     loading?: boolean;
     loadingIcon?: string;
+    virtualScrollerOptions?: VirtualScrollerProps;
 }
 
 declare class Dropdown {