wrap setup in a fn.

clj/clarity/cljs/clarity/client.cljs

(def query-field (js/document.querySelector "#query"))
(def query-result (js/document.querySelector "#query-type-check"))
(.addEventListener query-field "input"
  (fn [e]
    (let [content (.-value query-field)
          check   (t/friendly-check (read-string content) t/datomic-attr-type)]
      (set! (.-textContent query-result) check))))
(defn main []
  (.addEventListener query-field "input"
    (fn [e]
      (let [content (.-value query-field)
            check   (t/friendly-check (read-string content) t/datomic-attr-type)]
        (set! (.-textContent query-result) check)))))

clj/clarity/map-sample.html

		<span id="query-type-check"></span>
	</div>
	<script src="target/cljsbuild-main.js"></script>
    <script>
        clarity.client.main();
    </script>
</body>
</html>