Porffor compiles the JS to WASM, so it would be kind of a waste. Though there might be no reason the two projects cannot share some logic, like parsing the JS and such. I kind of doubt this is why its being funded. It sounds like a useful project.
No. Completely green field. Well, it _was_. I believe they’ve recently accepted that third party libraries will be allowed in the non-Serenity OS version.
Given that defunkt's current project is a game engine/IDE, makes sense he's interested in an ultra-fast compiler for a popular language that builds compact sub-MB native executables...