message: Exported named App so fast refresh works
diff: @@ -28,10 +28,12 @@ west.getUnmountStyle = from => from ? 'west_in' : 'west_out';
  stateNavigator.navigate('north');
  -export default () => (
  +const App = () => (
  <NavigationHandler stateNavigator={stateNavigator}>
  <NavigationStack
  crumbStyle={(from, state) => state.getCrumbStyle(from)}
  unmountStyle={(from, state) => state.getUnmountStyle(from)} />
  </NavigationHandler>
  );
  +
  +export default App;
  