As someone quite in love with functional programming (background in Haskell and Scala), one thing that seems quite obviously missing here and in my Javascript experience so far is the use of typeclasses as a form of ad-hoc polymorphism.
Is there a nice (i.e. not too much boilerplate) way of using them in the land of Javascript/Typescript?
See https://github.com/gcanti/fp-ts. Heavily haskell-inspired and includes a TS implementation of higher-kinded types.