chore(examples): add undirectional

example/src/index.tsx

@@ -23,6 +23,7 @@ import Layout from './Layouting';
 import SwitchFlows from './Switch';
 import UseZoomPanHelper from './UseZoomPanHelper';
 import UseUpdateNodeInternals from './UseUpdateNodeInternals';
+import Undirectional from './Undirectional';
 
 import './index.css';
 
@@ -111,6 +112,10 @@ const routes = [
     path: '/useupdatenodeinternals',
     component: UseUpdateNodeInternals,
   },
+  {
+    path: '/undirectional',
+    component: Undirectional,
+  },
 ];
 
 const Header = withRouter(({ history, location }) => {