* check base type when checking externs

* add CLJS-3408 test, verifying reported issue is resolved

src/main/clojure/cljs/analyzer.cljc

@@ -1048,7 +1048,10 @@
                xmeta (meta x')]
            (if (and (= 'Function (:tag xmeta)) (:ctor xmeta))
              (or (has-extern?* (into '[prototype] (next pre)) externs' top)
-                 (has-extern?* (next pre) externs' top))
+                 (has-extern?* (next pre) externs' top)
+                 ;; check base type if it exists
+                 (when-let [super (:super xmeta)]
+                   (has-extern?* (into [super] (next pre)) externs top)))
              (recur (next pre) externs' top))))))))
 
 (defn has-extern?

src/test/clojure/cljs/externs_infer_tests.clj

@@ -475,6 +475,17 @@
                ["Object.renderInline;"])
             res)))))
 
+(deftest test-cljs-3408
+  (testing "inheritance of JS Types is inferred"
+    (let [ws  (atom [])
+          res (infer-test-helper
+                {:forms '[(ns foo.core)
+                          (.querySelectorAll js/document "div")]
+                 :warnings ws
+                 :warn true
+                 :with-core? true})]
+      (is (empty? @ws)))))
+
 (comment
   (binding [ana/*cljs-ns* ana/*cljs-ns*]
     (ana/no-warn