I completely agree that TypeScript is ideal for LLMs. The type system and the extensive training data make it the best choice. But as someone who's been working with TypeScript for a while, I still see LLMs struggling with complex generics or even simple types. It’s better than before, but still far from perfect.

Also, TypeScript error messages can be a pain. When LLMs encounter something like "SomeType is not assignable," instead of handling it properly, they often just cast it to any. This happens way too often.