Assume these files live in a dir `testing`.

bar.clj

(ns testing.bar (:require [baz :refer :all]))

;; should expose the same function as foo, i.e. qux

baz.clj

(ns testing.baz)


(defn qux [s] s)

foo.clj

(ns testing.foo (:require [baz :refer :all]))

;; qux is available as a var only from the scope of this file,
;; however we would like to expose it to programs that invoke
;; foo as a library like this:
;; 
;; => (require '[testing.foo :as foo])
;; => (foo/qux "test")
;; "test"