Generate kotlinLib.js using closure compiler

build.xml

@@ -150,7 +150,40 @@
         <include name="html5/**"/>
       </fileset>
     </jar>
-    <copy file="${basedir}/js/js.translator/testFiles/kotlinFullLib_ecma3.js" tofile="${kotlin-home}/lib/kotlinLib.js"/>
+    <java classname="com.google.javascript.jscomp.CommandLineRunner" failonerror="true">
+      <classpath>
+        <pathelement location="${basedir}/js/js.translator/lib/closure-compiler.jar"/>
+      </classpath>
+      <arg value="--formatting"/>
+      <arg value="PRETTY_PRINT"/>
+      <arg value="--language_in"/>
+      <arg value="ECMASCRIPT5_STRICT"/>
+      <arg value="--compilation_level"/>
+      <arg value="SIMPLE_OPTIMIZATIONS"/>
+      <arg value="--js"/>
+      <arg value="${basedir}/js/js.translator/testFiles/kotlin_lib_ecma5.js"/>
+      <arg value="--js"/>
+      <arg value="${basedir}/js/js.translator/testFiles/kotlin_lib.js"/>
+      <arg value="--js_output_file"/>
+      <arg value="${kotlin-home}/lib/kotlinEcma5.js"/>
+    </java>
+    <java classname="com.google.javascript.jscomp.CommandLineRunner" failonerror="true">
+      <classpath>
+        <pathelement location="${basedir}/js/js.translator/lib/closure-compiler.jar"/>
+      </classpath>
+      <arg value="--formatting"/>
+      <arg value="PRETTY_PRINT"/>
+      <arg value="--language_in"/>
+      <arg value="ECMASCRIPT3"/>
+      <arg value="--compilation_level"/>
+      <arg value="SIMPLE_OPTIMIZATIONS"/>
+      <arg value="--js"/>
+      <arg value="${basedir}/js/js.translator/testFiles/kotlin_lib_ecma3.js"/>
+      <arg value="--js"/>
+      <arg value="${basedir}/js/js.translator/testFiles/kotlin_lib.js"/>
+      <arg value="--js_output_file"/>
+      <arg value="${kotlin-home}/lib/kotlinLib.js"/>
+    </java>
   </target>
 
     <target name="compiler">