I'm into web development so TypeScript / JavaScript are parts of my stack. I also prefer TypeScript due to its typing system. Here are the problems.

1. Compatibility issues:

   • Every now and then, an error will pop up because the library does not fully support TypeScript.
   • ES version is also an issue, some libraries only support ES5, some ES6, and so on. This sometimes makes such a trivial task like import become a pain.

2. Transpiling issues:

   • Although most of the tasks are handled by bundled cli like create-react-app, many times I spent hours just to figure out why my jest tests fails as it could not run on this 1% TypeScript code. Certainly, this problem not limited to jest though.

Be it a framework, a library, a programming language, etc. What are the pain points of your beloved technology?