Made create-react-class S(tate) template optional (#39154)

* create-react-class: default state to {}

It's irksome having to always provide a `{}`...

* Added props-without-state test

* Added props declaration to CCC

types/create-react-class/create-react-class-tests.ts

@@ -79,6 +79,12 @@ const ClassicComponentNoProps: React.ClassicComponentClass = createReactClass({
     }
 });
 
+const ClassicComponentNoState: React.ClassicComponentClass<{ text: string }> = createReactClass<{ text: string }>({
+    render() {
+        return DOM.div(this.props.text);
+    }
+});
+
 // React.createFactory
 const classicFactory: React.ClassicFactory<Props> =
     React.createFactory(ClassicComponent);

types/create-react-class/index.d.ts

@@ -7,7 +7,7 @@
 import { ComponentSpec, ClassicComponentClass } from "react";
 
 declare namespace createReactClass {}
-declare function createReactClass<P, S>(spec: ComponentSpec<P, S>): ClassicComponentClass<P>;
+declare function createReactClass<P, S = {}>(spec: ComponentSpec<P, S>): ClassicComponentClass<P>;
 
 export as namespace createReactClass;
 export = createReactClass;