I suppose the fact it is being overhauled right now also makes it a bit of a moving targret

Look forward to seeing what you come up with 🙂 kondo is a fantastic tool, thank you for your work on it

on the ret-types branch using this config:

:type-mismatch
{:level :warning
 :vars {clj-kondo.core/print! {:arities {1 {:args [:map]
                                            :ret :nil}}}
        clj-kondo.core/run! {:arities {1 {:args [:map]
                                          :ret :map}}}}}

$ echo "(require '[clj-kondo.core :as clj-kondo]) (clj-kondo/run! nil)" | clj -A:clj-kondo --lint -
<stdin>:1:59: warning: Expected: map, received: nil.