Where can I find detailed extension API changes of gnome-shell 3.12 ?

[邓尧 <torshie gmail com>]

Hi,

I feel it's very inconvenience to use gnome-shell without the YAWL
extension. The extension is only partially functional under 3.12, and
the author has already abandoned it.
After some extensive Googling with no luck, I decided to fix it
myself. I'm planning to start with API changes

I'm new to gnome-shell extension development, any suggestion would be
appreciated.

Thanks
Deng Yao