Best books for learning HTML5/JavaScript Mobile Apps?

I find that these types of frameworks move so fast that any book about them goes out of date almost immediately. I've been following along with IonicFramework.com's progress and their github repo.

Try just reading through their code and examples and deconstruct what they're working towards.

Anybody who worked with Sencha/ExtJS could attest to it. A few years back they were the goto mobile framework and it seems to have lost steam. The best way would be to monitor current trends and learn the design principles and frameworks that they're based off of (right now, MV* frameworks like Angular, what Ionic is using.)

Thanks to all for the input!

what are some html5/javascript frameworks for building desktop GUI apps?