Have you though of some more modern language agnostic solution like wasm plugins users could write in anything, with the help of typed languages if they like? Or is that not feasible for a scripting project like this?
I expect that is possible, but the specific choice of JavaScript is because Apple ships a framework that bridges types very nicely between native and JS. It's used by WebKit, so it works really well and is very unlikely to disappear.
That means the core of Hammerspoon goes from being incredibly complicated, to really just a protocol conformance.
That means the core of Hammerspoon goes from being incredibly complicated, to really just a protocol conformance.