fix reflection warning without breaking ability to load meander.util.epsilon without clojurescript on classpath

.gitignore

@@ -18,3 +18,5 @@ nashorn_code_cache/
 /bin/release/
 .cache
 .calva
+.idea/
+*.iml

src/meander/util/epsilon.cljc

@@ -5,9 +5,7 @@
      (:require-macros [meander.util.epsilon
                        :refer [__disj
                                __dissoc
-                               __nth]]))
-  (:import #?(:bb  ()
-              :clj (cljs.tagged_literals JSValue))))
+                               __nth]])))
 
 #?(:clj (set! *warn-on-reflection* true))
 
@@ -721,26 +719,40 @@
                    (symbol (name (:name cljs-ns)) (name sym)))))
              sym)))
 
-#?(:bb
-   (defn js-value? [_x] false)
-   :clj
-   (defn js-value? [x] (instance? JSValue x))
+#?(:clj
+   (try
+     (let [c (Class/forName "cljs.tagged_literals.JSValue")]
+       (defn js-value? [x]
+         (instance? c x)))
+     (catch ClassNotFoundException _
+       (defn js-value? [x]
+         false)))
    :cljs
-   (defn js-value? [_x] false))
+   (defn js-value? [x]
+     false))
 
-#?(:bb
-   (defn make-js-value [x] x)
-   :clj
-   (defn make-js-value [x] (new JSValue x))
+#?(:clj
+   (try
+     (let [c (Class/forName "cljs.tagged_literals.JSValue")
+           s 'cljs.tagged_literals.JSValue]
+       (defn make-js-value [x]
+         (eval `(new ~s ~x))))
+     (catch ClassNotFoundException _
+       (defn make-js-value [x]
+         x)))
    :cljs
    (defn make-js-value [x] x))
 
-#?(:bb
-   (defn val-of-js-value [x] x)
-   :clj
+#?(:clj
+   (defmacro val-op
+     {:private true}
+     [x]
+     (try
+       (Class/forName "cljs.tagged_literals.JSValue")
+       `(.val ^"cljs.tagged_literals.JSValue" ~x)
+       (catch ClassNotFoundException _
+         nil))))
+
+#?(:clj
    (defn val-of-js-value [x]
-     (if (js-value? x)
-       (.-val ^JSValue x)
-       x))
-   :cljs
-   (defn val-of-js-value [x] x))
+     (if (js-value? x) (val-op x) x)))