CodeMirror's been fantastic for us: as folks building a programming language, we wanted a way to create a playground for people to try it out (much like what Go

CodeMirror's been fantastic for us: as folks building a programming language, we wanted a way to create a playground for people to try it out (much like what Goland and Rust did), and we found CodeMirror super helpful for putting together https://www.promptfiddle.com/ https://www.promptfiddle.com/ It did help that we wrote our compiler in Rust and were able to transpile it to WASM :)