Thanks for node-fibers, that is something I missed and it looks promising, should try it server-side at least. But I'm not sure what you mean by "reflect on module exports", since there seems to be no way to enumerate all functions (in node), except those exported by hand. I workarounded it via "autoexport(module, x => eval(x))" and "// @export" tags, but it feels dirty.

I also bet that I couldn't make 'in' work for proxy with empty abstract target, but maybe it's just me. Btw, 'in' and 'of' are two separate iterators, one iterates array elems and the other iterates object's keys -- something essential to metaprogramming. My whole point on in/enumerate is that it considered legacy by someone special.

And on Vue: I didn't know that, but if Vue can't take advantage of Proxy, can I?