I understand that joker doesn't try to resolve symbols from external namespaces, and it does show an error if I use a symbol that was referred with a :refer :all in the require form.

I do not use :refer :all much, but there are a few cases (like com.rpl.specter) where I make an exception, and I would be fine with configuring joker to know about those few exceptions.

Would it be easy to add an option I could put in the .joker config file :known-unqualified-syms [ALL collect collect-one MAP-KEYS ... ] and then not get false positives from joker when using those symbols unqualified? (or, is there another way to silence these warnings that I missed?)

If someone can point me in the right direction, I might be able to do it myself. I just discovered joker today (and it's awesome! 🚀 ).