Looking for the Signal protocol in JavaScript

I'm looking for the signal protocol for frontend JavaScript that can run purely on a browser. I came across this:

https://github.com/signalapp/libsignal-protocol-javascript

This seems to be deprecated and suggests to use this other repo for it here:

https://github.com/signalapp/libsignal

I could take a look there and adapt it into clientside javascript, but wondering if there is already something out there for this?