Typescript makes writing large codebases in js actually possible. But it's still missing a few things and there's not much they can do about it. Pattern matchin

Typescript makes writing large codebases in js actually possible. But it's still missing a few things and there's not much they can do about it. Pattern matching, and real support for sum types (not just having a 'type' field w/ a string) would be at the top of my list I think. Working with type parameters can also get a bit unweidly, and bounding them with the 'extends' keyword is a pain in the ass. IMO of course.