Fix react-dnd HTML5 Backend

The type signatures previously did not match the JavaScript definition
for this module.

react-dnd/react-dnd-tests.ts

@@ -13,7 +13,7 @@ import DragSource = ReactDnd.DragSource;
 import DropTarget = ReactDnd.DropTarget;
 import DragLayer = ReactDnd.DragLayer;
 import DragDropContext = ReactDnd.DragDropContext;
-import HTML5Backend = require('react-dnd/modules/backends/HTML5');
+import HTML5Backend, { getEmptyImage } from 'react-dnd/modules/backends/HTML5';
 import TestBackend = require('react-dnd/modules/backends/Test');
 
 // Game Component
@@ -82,11 +82,11 @@ module Knight {
 
     export class Knight extends React.Component<KnightP, {}> {
         static defaultProps: KnightP;
-        
+
         static create = React.createFactory(Knight);
 
         componentDidMount() {
-            var img = HTML5Backend.getEmptyImage();
+            var img = getEmptyImage();
             img.onload = () => this.props.connectDragPreview(img);
         }
 
@@ -157,7 +157,7 @@ module BoardSquare {
 
     export class BoardSquare extends React.Component<BoardSquareP, {}> {
         static defaultProps: BoardSquareP;
-        
+
         private _renderOverlay = (color: string) => {
             return r.div({
                 style: {

react-dnd/react-dnd.d.ts

@@ -176,13 +176,9 @@ declare module "react-dnd" {
 }
 
 declare module "react-dnd/modules/backends/HTML5" {
-    enum _NativeTypes { FILE, URL, TEXT }
-    class HTML5Backend implements __ReactDnd.Backend {
-        static getEmptyImage(): any; // Image
-        static NativeTypes: _NativeTypes;
-    }
-
-    export = HTML5Backend;
+    export enum NativeTypes { FILE, URL, TEXT }
+    export function getEmptyImage(): any; // Image
+    export default class HTML5Backend implements __ReactDnd.Backend {}
 }
 
 declare module "react-dnd/modules/backends/Test" {