> you may also want to look into Squirrel

Is it still active? Last release was in 2022...

Most recent commit on the github[0] was only 11 months ago.

Also, it's not a javascript framework, a stable software doesn't have to update often. Look at Lua, most people still use Lua 5.1 and that was released in 2006.

[0] https://github.com/albertodemichelis/squirrel

It's not being actively developed but gets some occasional patches on Github. It's mature (e.g. was used for a number of Valve's games). If you want an actively improving language, look at Quirrel.