Have a basic interpreter worked out, currently implementing tracing, no WASM currently being output. I have some previous experience generating wasm tho:

https://github.com/serprex/Befunge https://github.com/serprex/brainwebfuckassembly

I don't really care about interacting with DOM. I feel that something like vDOM & working out a method to play nice with emscripten's ABI will have more use for projects which want to run a wasm jit with the code being mostly in WASM

lua.js seems promising on the not-wasm front. Possibility to allow coroutines by implementing those on top of generators like I've done in my own implementation