Comment by jaen

By Haskell's type system do you mean with all the GHC extensions?

Because TypeScript has structural sub-typing, while standard Haskell (eg. `A | B | C`) has neither subtyping nor structural typing, which both are very useful features for safe "integration/glue" type of programs.

(String) literals form a fundamental part of the TS "row polymorphism" (record types) and eg. tuple union type implementation.

You can type a non-empty array that starts with zero...

    type Arr = [0, ...number[]];
    const a: Arr = [0, 1, 2, 3, 4]

Now try in Haskell.