The workflow is you write in Hypatia, compile, make the compiled Lua require statements to the Roblox version, and Rojo, a Rust built development tool, will sync your Lua directly into Roblox. You can then call the exposed functions directly from other Lua (i.e. Buttons, events, etc). I’m thinking of automating that require change with Python… or maybe Lua.

Compiling Hypatia required a couple of smart Haskell devs at work to help me compile. Cabal didn’t work but Stack worked no problem on my Mac M1. Hypatia might compile JavaScript too, not sure.

Anyway, still need to figure out side effects (still learning what the heck a f -> Unit is), and how to deal with coroutines and various other side effects since Hypatia doesn’t handle them like Elm does, but super excited to continue exploring this.