Whats with this plugin?

I came looking for something that would help me write a app that looks good in Material and Cupertino. I started with a NativeApp, but then saw you cant add any routes. Nevermind then, I will use MaterialApp. So then I set the default route to a NativeScaffold, and try to add a NativeSearchAppBar as the app bar. NativeSearchAppBar cant be used as a NativeAppBar. Nevermind then, I will use Scaffold. Then the NativeSearchAppBar then seems to do nothing, so I set isSearching to true, and the widget just gives an error. I'm just all around very confused about this plugin, and what its supposed to do.