Clojurians Log v2

consider I have 3 namespaces debug, if-def-demo and main as below 1.) debug namespace

(ns debug)

(def enabled? true)

(ns if-def-demo)

(def mseq [ "a" "b" "c"])

(if (debug/enabled?)
  (def my-var mseq))

(ns main)

(println if-def-demo/my-var)

if-def-demo/my-var is not visible in main namespace

The fact that a static analysis tool like Cursive cannot find it is usually a sign that things are getting a bit too complex. I personally like to use a combination of (defonce ...) and atoms for such cases instead of conditional (def ) or conditional-anything…

(ns debug)

(defonce enabled? (atom true))

(ns if-def-demo)

(def mseq ["a" "b" "c"])

(defonce my-atom (atom nil))

;; also ideally hide this inside a fn, (defn init [ ] ...) or similar
;; top-level side effects can create complex hard-to-debug behavior during loading or compilation phases
(if @debug/enabled?
  (reset! my-atom mseq))

If you need something more… “proper” for managing stateful stuff like that, this is a good choice https://github.com/stuartsierra/component

But I still end up using the defonce + atom simple solution more often than not

Thanks @raspasov