I've re-directed my focus from manually porting ChucK to JavaScript (i.e., ChucKJS) to an automatic port with the help of the Emscripten tool (http://emscripten.org/): https://github.com/aknuds1/chuck/tree/emscripten. I don't know yet how this'll pan out, but I'm thinking it should be more future proof than having to maintain an independent JavaScript version of ChucK. Also, it ought to be much more performant, since Emscripten generates asm.js rather than vanilla JavaScript.

The status of the port is that I am currently able to generate a JavaScript library, chuck.js, which can be invoked, but I need to write shims for dependencies such as the audio driver to actually do anything useful.

Arve