> if I have been writing code with Java / C# for nearly a decade , nothing has come close to Typescript in terms of productivity,flexibility and confidence

I can completely relate. To me the greatest thing is the tooling around it. Using tide[0] on even plain js codebase is just amazing.

I really wish ruby had a TypeRuby compiler (to regular ruby). I know about crystal, but I still want regular Ruby, just with a type checker at compile time, not runtime.

[0]: https://github.com/ananthakumaran/tide