message: Fix small issue in DragDrop
diff: @@ -31,13 +31,13 @@ declare class DragDrop {
  * The HTML selector which identifies draggable elements
  * @defaultValue `undefined`
  */
  - dragSelector: string | undefined;
  + dragSelector: string | null | undefined;
  /**
  * The HTML selector which identifies drop targets
  * @defaultValue `undefined`
  */
  - dropSelector: string | undefined;
  + dropSelector: string | null | undefined;
  /**
  * A set of permission checking functions for each action of the Drag and Drop workflow
  