help with macros in cljs

client_code.cljs

(ns buster-cljs.test.macros-test
  (:require [buster-cljs.core :as core])
  (:require-macros [buster-cljs.macros
                    :refer [initialize-buster deftest describe it is]]))

(deftest is-macro-with-exception-features
  (it "assertions with `thrown?'"
    (is (thrown? js/Error
                 (throw (js/Error. "an error"))))))

macros.clj

(ns buster-cljs.macros
  (:refer-clojure :exclude [try])
  (:require [cljs.core :refer [try]]
            [clojure.string :as str]))

(defmethod assert-expr 'thrown-with-msg? [msg form]
  ;; we ignore on purpuse the exception argument
  ;; (it always going to be js/Error)
  (let [re (nth form 2)
        body (nthnext form 3)]
    `(try
       ~@body
       (.assert js/buster false "expected error to be thrown.")
       (catch js/Error e
         (.assert js/buster (re-find ~re (.-message e)))))))

result.js

buster.spec.describe("is macro with exception features", function() {
  buster.spec.it("assertions with `thrown?'", function() {
    throw Error("an error");
  });
  return null
});