I like plain Javascript more. I guess those who are from Java/C# background would like TS.
Been using dynamic languages almost entirely for the last 20 years. I love TypeScript. Starting to wish the other languages I worked with had optional types.
Having to import basic types, use awkward syntax, etc... Blergh. I really hope we can be more pragmatic and learn from typescript.
Considering that everyone seems to use six to target both Python 2 and 3, I am seriously wondering if the language will ever advance at all.
[1]: https://opensource.com/life/14/9/why-python-4-wont-be-python...
Mypy started out life as a separate language with pythonic but not Python-compatible syntax and multiple backends that was plannining to take advantage of static typing information and avoiding a GIL to be more performant than Python when compiled to native code rather than using the Python backend.
It later developed a Python-compatible syntax, before becoming a static typing front-end for Python.
Outside of JS land (and that only because of the browser being an environment where the only universally available thing is JS, though WebAssembly maturing may radically change this), there's not really a lot of demand for a separate language that fixes perceived warts in a target language but otherwise hews very close to the target and compiles to that target. Languages that aim to improve another languages ecosystem usually target the same VM instead of being transpiled, and usually offer different style syntax (e.g., Elixir for Erlang.)
There are whole categories of bugs that you can completely eliminate by simply annotating your code with some types. IMHO with the current state of technology, opting out of a static type system is getting pretty hard to defend. Why would you open yourself up to all the nasty bugs that can trivially be detected by a type system? How is that acceptable or better? Transpilers, type inference, linters decent editor integration, etc. have removed most of the traditional argumentation against this (e.g. verbosity, expressiveness, etc.).
ATM I'm doing a pure JS project, it's just some React components / views and some functions that provide glue between 3rd party services. I might do a POC to see how easy it is to use in this project / setting.