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 I am very productive with Dart, and find Typescript annoying. So I guess it depends.  
 And you are writing in Flutter? That's sort of half way between classic Kotlin and RN 
 Yes, it's something I have previous experience with. I love Dart, and it's getting awesomer now with metaprogramming. The part I dislike the most is that it's a Google project. 

Kotlin is great too.