The older ones, no. The current project will be. I am developing in private and occasionally rewriting the jj tree to make each commit self-contained. So it won't contain all the false-starts and bad code, only the cleaned up version.
"ut" (https://github.com/s-i-e-v-e/ut) exists, but it is more of a POC for the syntax more than anything. So lexer+parser+typechecker. Did this during COVID in TypeScript but did not finish.
