Fix incremental-dom typings

incremental-dom/incremental-dom.d.ts

@@ -1,6 +1,6 @@
 // Type definitions for Incremetal DOM
 // Project: https://github.com/google/incremental-dom
-// Definitions by: Basarat Ali Syed <https://github.com/basarat>
+// Definitions by: Markus Lanthaler <https://github.com/lanthaler>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 declare module "incremental-dom" {
@@ -8,10 +8,11 @@ declare module "incremental-dom" {
      * Patches the document starting at el with the provided function. This function
      * may be called during an existing patch operation.
      * @param {!Element} el the element to patch
-     * @param {!function} fn A function containing elementOpen/elementClose/etc.
+     * @param {!function(T)} fn A function containing elementOpen/elementClose/etc.
      *     calls that describe the DOM.
+     * @param {?T} data An argument passed to fn to represent DOM state.
      */
-    export var patch: (el: Node, fn: Function) => void;
+    export var patch: <T>(el: Node, fn: (data: T) => void, data?: T) => void;
 
     /**
      * Declares a virtual Element at the current location in the document. This