need preserve original :provides

Author: swannodette

src/main/clojure/cljs/js_deps.cljc

@@ -135,6 +135,11 @@ case."
       (some (fn [provide] (get-in index [provide :file]))
         (:provides lib-spec))))
 
+(defn lib-spec-merge [a b]
+  (merge a
+    (cond-> b
+      (contains? a :provides) (dissoc :provides))))
+
 (defn build-index
   "Index a list of dependencies by namespace and file name. There can
   be zero or more namespaces provided per file. Upstream foreign libraies
@@ -148,7 +153,7 @@ case."
                        (reduce
                          (fn [index' provide]
                            (if (:foreign dep)
-                             (update-in index' [provide] merge dep)
+                             (update-in index' [provide] lib-spec-merge dep)
                              ;; when building the dependency index, we need to
                              ;; avoid overwriting a CLJS dep with a CLJC dep of
                              ;; the same namespace - António Monteiro
@@ -165,7 +170,7 @@ case."
                        index)]
         (if (:foreign dep)
           (if-let [file (get-file dep index')]
-            (update-in index' [file] merge dep)
+            (update-in index' [file] lib-spec-merge dep)
             (throw
               (Exception.
                 (str "No :file provided for :foreign-libs spec " (pr-str dep)))))