[sgorawski]

Hey, I'm not, the code is sent to the server for execution.

I'm afraid can't help with the libs then ;)

I'd like to have more functionality in-browser, though, like an LSP running as a worker in the background. Do you have any materials that I could read about it or something like that?

[bkyan]

It's been some time since I've played with this stuff, but the libs I used were https://github.com/oraoto/pib for in-browser PHP, Pyodide for in-browser Python, and https://webperl.zero-g.net for in-browser Perl.