That's cool, and will keep it in mind for the next time I work on a node project.

Looks like it works by having the typescript compiler generate experimental annotations in the output javascript, and reading it using a polyfill for the proposed ES7 reflection api. On one hand, yeay looks like proper runtime reflection is coming! On the other hand, it doesn't sound fully baked yet... <insert here a general grumble about how everything in the JS ecosystem is in this state>