[ClojureScript] Wrapping all def into a load event handler

foo.cljs

(defn init []

  (def main (goog.dom/getElement "main"))

  (def mydiv (goog.dom/createDom "div"))

  (goog.dom/appendChild main mydiv)

  (defn change-color-mydiv []
    (... mydiv)))

(goog.events/listen js/window goog.events.EventType/LOAD init)