CLJS-2229: Ensure that new modules work works correctly with REPLs

1. when processing ns forms we need to check if we need to
   process js modules. This potentially requires two passes
   in the second pass suppresss dupe alias check which would
   otherwise get fired due to rewriting the alias to the
   generated Closure module name.

2. We need to apply a simpler strategy to transitive dependencies.
   When we've determined all the sources, call handle-js-modules
   deps on these.

Author: dnolen

src/main/clojure/cljs/repl.cljc

@@ -196,7 +196,7 @@
                 (remove (comp #{["goog"]} :provides))
                 (remove (comp #{:seed} :type))
                 (map #(select-keys % [:provides :url])))]
-     (cljsc/handle-js-modules opts sources env/*compiler* false)
+     (cljsc/handle-js-modules opts sources env/*compiler*)
      (if (:output-dir opts)
        ;; REPLs that read from :output-dir just need to add deps,
        ;; environment will handle actual loading - David
@@ -454,9 +454,17 @@
                                      :source-form form}
                   :repl-env repl-env})
            def-emits-var (:def-emits-var opts)
-           ast (binding [ana/*analyze-deps* false]
-                 (ana/analyze (assoc env :def-emits-var def-emits-var)
-                   (wrap form) nil opts))
+           ->ast (fn [form]
+                   (binding [ana/*analyze-deps* false]
+                     (ana/analyze (assoc env :def-emits-var def-emits-var)
+                       (wrap form) nil opts)))
+           ast (->ast form)
+           ast (if-not (#{:ns :ns*} (:op ast))
+                 ast
+                 (let [ijs (ana/parse-ns [form])] ;; if ns form need to check for js modules - David
+                   (cljsc/handle-js-modules opts [ijs] env/*compiler*)
+                   (binding [ana/*check-alias-dupes* false]
+                     (ana/no-warn (->ast form)))))
            wrap-js
            ;; TODO: check opts as well - David
            (if (:source-map repl-env)
@@ -857,7 +865,6 @@
                      (let [value (eval repl-env env input opts)]
                        (print value))))))]
          (cljsc/maybe-install-node-deps! opts)
-         (cljsc/handle-js-modules opts '() env/*compiler* false)
          (comp/with-core-cljs opts
            (fn []
              (binding [*repl-opts* opts]