Full styleguide now available via yarn styleguide

Due to a number of hacks, the style guide can be used to show Backbone
views. This will allow a smooth path from the old way of doing things to
the new.

js/react/util/index.ts

@@ -0,0 +1,24 @@
+// Helper components used in the styleguide, exposed at 'util' in the global scope via the
+//   context option in reaat-styleguidist.
+
+export { MessageParents } from './MessageParents';
+export { BackboneWrapper } from './BackboneWrapper';
+
+// Here we can make things inside Webpack available to Backbone views like preload.js.
+
+import React from 'react';
+import ReactDOM from 'react-dom';
+
+import { Message } from '../conversation/Message';
+import { Reply } from '../conversation/Reply';
+
+// Required, or TypeScript complains about adding keys to window
+const parent = window as any;
+
+parent.React = React;
+parent.ReactDOM = ReactDOM;
+
+const SignalReact = parent.Signal.React = parent.Signal.React || {};
+
+SignalReact.Message = Message;
+SignalReact.Reply = Reply;