Remove explicit use of js/Error. Starting the process of making re-frame cljc-ready

examples/todomvc/src/todomvc/handlers.cljs

@@ -14,7 +14,7 @@
   "throw an exception if db doesn't match the schema."
   [a-schema db]
   (if-let [problems  (s/check a-schema db)]
-    (throw (js/Error. (str "schema check failed: " problems)))))
+    (throw (ex-info "schema check failed: " {:problems problems}))))
 
 ;; Event handlers change state, that's their job. But what happens if there's
 ;; a bug and it corrupts this state in some subtle way? This middleware is run after

src/re_frame/router.cljs

@@ -144,7 +144,7 @@
             [:paused :add-event] [:paused  #(-add-event this arg)]
             [:paused :resume   ] [:running #(-resume this)]
 
-            (throw (js/Error. (str "re-frame: router state transition not found. " fsm-state " " trigger))))]
+            (throw (ex-info "re-frame: router state transition not found" {:fsm-state fsm-state :trigger trigger})))]
 
       ;; The "case" above computed both the new FSM state, and the action. Now, make it happen.
       (set! fsm-state new-fsm-state)