At first I thought this was using a compiler to figure out data dependencies on regular javascript objects, including built in's on the window and coming from third party dependencies, so you could do this:
<div>window width: {window.innerWidth}</div>
But it's not, it's just on objects that subclass a Store.
This is an interesting idea, though, thanks for bringing it up! I will think about it and try to add it to the compiler. Especially native objects like `window` would be great to create handlers for in the compiler. It would make life really easy for the developer.