Add index signature to 'ComponentSpec' in 'react'.

react/react-global.d.ts

@@ -215,6 +215,8 @@ declare module React {
 
     interface ComponentSpec<P, S> extends Mixin<P, S> {
         render(): ReactElement<any>;
+
+        [propertyName: string]: any;
     }
 
     //

react/react-tests.ts

@@ -41,24 +41,24 @@ var container: Element;
 
 var ClassicComponent: React.ClassicComponentClass<Props> =
     React.createClass<Props, State>({
-        getDefaultProps: () => {
+        getDefaultProps() {
             return <Props>{
                 hello: undefined,
                 world: "peace",
                 foo: undefined,
-                bar: undefined
+                bar: undefined,
             };
         },
-        getInitialState: () => {
+        getInitialState() {
             return {
                 inputValue: this.context.someValue,
                 seconds: this.props.foo
             };
         },
-        reset: () => {
+        reset() {
             this.replaceState(this.getInitialState());
         },
-        render: () => {
+        render() {
             return React.DOM.div(null,
                 React.DOM.input({
                     ref: input => this._input = input,

react/react.d.ts

@@ -215,6 +215,8 @@ declare module __React {
 
     interface ComponentSpec<P, S> extends Mixin<P, S> {
         render(): ReactElement<any>;
+
+        [propertyName: string]: any;
     }
 
     //