[zellyn]

It's fun and valuable to have a place to land proposals and try them out early (seems like TS itself should have flags for this though). The problem is that as the proposal is refined, or if it is rejected, it implies constant changes to your language, which will basically drive away anyone who's not experimenting around for fun in the same mindset as you. Could be good or bad, although managing the flux might be tricky even so.

The addition of quick things you whipped up in a couple of hours seems like it'll make the rate of changes impossible to handle. It's unlikely almost by definition that the change you whipped up quickly will stand the test of repeated use and further experience unmodified.

All that said, it's a super fun thing to do, and hats off for such an ambitious project. If nothing else, writing a parser, transpiler, etc. is impressive and fun work, and will undoubtedly enable/force you to learn all the javascript/TS quirks and details extremely well! :-)