OperCom is the beginnings of an alternative Teams client, supporting reading chats and notifications.
It does not support any kind of live updates.
A dummy demo is available here
The application exists as 2 components: a web app and a Caddy proxy.
This is needed due to CORS.
Windows: $ yarn proxy-windows
Linux: $ yarn proxy-linux
$ yarn build
Windows: $ yarn proxy-windows ; yarn dev
Linux: $ yarn proxy-linux & yarn dev