Re:Six years of professional Clojure development
by jeofken on Thursday May 06, 2021 @08:02AM
(#27061964)
Hopeful new lispers beware that core.typed is not so easy to use as TypeScript, and slows things down quite a bit, and you will need to write a lot of type definitions for 3rd party code. Most (all I’ve seen) clojure shops instead rely on runtime type checking with Spec or Schema, both still popular
(note that Lisp is flexible enough that a type system can be written as a library)
There's also this for run-time checking (i.e., you won't get any help at compile-time, but functions called with bad values will fail in very clear ways): https://github.com/plumatic/schema