clj-kondo: a linter for clojure code that sparks joy (DCM May '19)

Transcript

1. clj-kondo Michiel Borkent @borkdude Dutch Clojure Meetup 2019-05-08
2. clj-kondo • a linter for Clojure and ClojureScript • static analysis: only looking at code, not executing • compiled to binary with GraalVM, runs on Linux and MacOS • runnable on Windows via JVM (but slower startup, so editor integration is not as nice)
3. Why another linter? • I've been a happy joker user since 2017 • Missing some features but not that experienced in Go... • joker only knows about 1 file at a time • clj-kondo knows about multiple files at a time, so it can lint calls that cross namespaces
4. Features
5. inline def
6. redundant let
7. redundant do
8. arity error
9. arity error calling other ns
10. arity error when calling a lib
11. arity error when calling Java
12. arity error when calling let- bound fn
13. letfn arity error
14. schema defn arity error
15. recur arity error
16. private call
17. cond
18. duplicate keys
19. missing map value
20. binding syntax
21. missing test assertion
22. CLJC
23. coming soon:
 unused namespace
24. Project setup
25. Config
26. Config
27. Thanks! • joker • rewrite-clj • CircleCI (best CI ever!) • eastwood • clj.native-image • people reporting bugs, false positives and suggesting new features
28. Thank for listening! Questions, suggestions? @borkdude