jQuery: added overload

jquery/jquery.d.ts

@@ -3329,6 +3329,12 @@ interface JQuery {
      */
     children(selector?: string): JQuery;
 
+    /**
+     * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
+     * 
+     * @param selector A string containing a selector expression to match elements against.
+     */
+    closest(selector: string): JQuery;
     /**
      * For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
      *