cljs.repl.server/start

functionpreviously cljs.repl.browser/start-serverEdit
(start opts)

Source docstring:
Start the server on the specified port.
Source code @ clojurescript:src/main/clojure/cljs/repl/server.clj
(defn start
  [opts]
  (let [ss (ServerSocket. (:port opts))]
    (.start
      (Thread.
        ((ns-resolve 'clojure.core 'binding-conveyor-fn)
          (fn [] (server-loop opts ss)))))
    (swap! state (fn [old] (assoc old :socket ss :port (:port opts))))))