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clj-kondo Michiel Borkent @borkdude Dutch Clojure Meetup 2019-05-08

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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)

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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

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Features

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inline def

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redundant let

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redundant do

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arity error

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arity error calling other ns

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arity error when calling a lib

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arity error when calling Java

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arity error when calling let- bound fn

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letfn arity error

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schema defn arity error

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recur arity error

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private call

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cond

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duplicate keys

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missing map value

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binding syntax

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missing test assertion

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CLJC

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coming soon:
 unused namespace

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Project setup

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Config

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Config

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Thanks! • joker • rewrite-clj • CircleCI (best CI ever!) • eastwood • clj.native-image • people reporting bugs, false positives and suggesting new features

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Thank for listening! Questions, suggestions? @borkdude