build fix. added Utils.swap()

Author: adumesny

src/dd-draggable.ts

@@ -301,8 +301,7 @@ export class DDDraggable extends DDBaseImplement implements HTMLElementExtendOpt
       this.dragOffset = this._getDragOffset(this.lastDrag, n.el, this.helperContainment);
       this.helper.style.width = this.dragOffset.width + 'px';
       this.helper.style.height = this.dragOffset.height + 'px';
-      function swap(o: unknown, a: string, b: string): void { const tmp = o[a]; o[a] = o[b]; o[b] = tmp; }
-      swap(n._orig, 'w', 'h');
+      Utils.swap(n._orig, 'w', 'h');
       delete n._rect;
       this._mouseMove(this.lastDrag);
     }

src/utils.ts

@@ -589,6 +589,9 @@ export class Utils {
     }
   }
 
+  /** swap the given object 2 field values */
+  public static swap(o: unknown, a: string, b: string): void { const tmp = o[a]; o[a] = o[b]; o[b] = tmp; }
+
   /** returns true if event is inside the given element rectangle */
   // Note: Safari Mac has null event.relatedTarget which causes #1684 so check if DragEvent is inside the coordinates instead
   //    this.el.contains(event.relatedTarget as HTMLElement)