CLJS-3209: With clojurescript 1.10.597 HelloWorld compiled with to 94K of JS with advanced optimizations turned on

Switch = to identical? in Node.js target check at bottom of core.cljs. Add test case to check for file size regressions.

Author: swannodette

project.clj

@@ -7,7 +7,7 @@
   :jvm-opts ^:replace ["-Dclojure.compiler.direct-linking=true" "-Xmx512m" "-server"]
   :source-paths ["src/main/clojure" "src/main/cljs"]
   :resource-paths ["src/main/cljs" "resources"]
-  :test-paths ["src/test/clojure" "src/test/cljs" "src/test/self" "src/test/cljs_cp"]
+  :test-paths ["src/test/clojure" "src/test/cljs" "src/test/self" "src/test/cljs_build" "src/test/cljs_cp"]
   :dependencies [[org.clojure/clojure "1.10.0-alpha4"]
                  [org.clojure/spec.alpha "0.1.143"]
                  [org.clojure/core.specs.alpha "0.1.24"]

src/test/cljs_build/trivial/core.cljs

@@ -0,0 +1,3 @@
+(ns trivial.core)
+
+(. js/console (log "Hello!"))

src/test/clojure/cljs/build_api_tests.clj

@@ -703,3 +703,16 @@
                 sha (string/lower-case (util/content-sha (slurp (io/file f)) 7))]
            (is (true? (.exists f)))
            (is (string/includes? (.getPath f) sha))))))))
+
+(deftest cljs-3209-trivial-output-size
+  (let [out (.getPath (io/file (test/tmp-dir) "3209-test-out"))
+        out-file (io/file out "main.js")
+        {:keys [inputs opts]} {:inputs (str (io/file "src" "test" "cljs_build"))
+                               :opts {:main 'trivial.core
+                                      :output-dir out
+                                      :output-to (.getPath out-file)
+                                      :optimizations :advanced}}
+        cenv (env/default-compiler-env)]
+    (test/delete-out-files out)
+    (build/build (build/inputs (io/file inputs "trivial/core.cljs")) opts cenv)
+    (is (< (.length out-file) 10000))))