Where can I read more about the Twitch object

That is, window.Twitch
I can’t seem to be able to find any documentation on it over at https://dev.twitch.tv/docs/ .
Can someone point me in the right direction?

A saw somewhere that there was also window.Twitch.Player and I can’t find that.

You posted in the extensions category,

Your original post was unclear. I guessted you meant extensions

Embedding is documented

Player more specifically here

Sorry, I thought it was part of the extension. My bad. Thanks.