Making those error messages
pic.twitter.com/9y5IbdOW9K
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And this cool diff view for pretty printing and lint autofixes (yes this is a linter too and not just a type checker)pic.twitter.com/upCoj8AfIi
What kind of type do you have right now ? Just the primitive types ? Do you want to add also the class types / interfaces / union types just like flow ?
Primitive types and the full object model. Still need to add generics which will be tricky, as well as type refinement and just fleshing out the rest of the type system.
I know it's stupid question but I tried to find answer on Babel and Jest repos and I failed... Can you please tell me if it's your code or custom library to show code with this nice`^^^` error pointer?
Look at the libraries @babel/code-frame or babel-code-frame
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