Oh my, this looks nice and comprehensive!

I’ve been wanting to write a Matrix client for a while now, but found myself too caught up in getting even an existing library to work: The Rust SDK, the most maintained and batteries-included SDK, doesn’t have JS bindings and the JS SDK is insufficiently documented and generally seems a bit crusty.

In general I find there to be a bit of a lack of guides on implementing Matrix, which is probability a factor in there not being that many implementations.