Same. I sometimes write TypeScript for 2 hours straight without actually running the code or any unit test, and it would just work -- the return value is exact

Same. I sometimes write TypeScript for 2 hours straight without actually running the code or any unit test, and it would just work -- the return value is exactly what you want. I don't think I can do that for JavaScript for more than 15 minutes even though they are the "same language".