build.xml

<?xml version="1.0"?>
<project basedir="." default="all">
	<taskdef name="closure" classname="com.google.javascript.jscomp.ant.CompileTask" classpath="lib/closure/compiler.jar" />

	<target name="init">
		<echo message="Building..." />
		<property name="lib.dir" value="${basedir}/lib" />
		<property name="src.dir" value="${basedir}" />
		<property name="test.dir" value="${basedir}/test" />
		<property name="build.dir" value="${basedir}" />
	</target>

	<target name="jslint" depends="init" description="Check JS with JSLint">
		<echo message="Running JSLint static analysis..." />
		<java jar="${lib.dir}/rhino/js.jar" fork="true">
			<arg value="${test.dir}/lint.js" />
		</java>
		<echo message="JSLint static analysis done." />
	</target>

	<target name="compile.js" depends="jslint" description="Compile JS">
		<echo message="Compiling script..." />
		<closure compilationLevel="simple" warning="verbose" debug="false" output="${build.dir}/countdown.min.js">
			<sources dir="${build.dir}">
				<file name="externs.js"/>
				<file name="countdown.js"/>
			</sources>
		</closure>
		<echo message="Script compilation done." />
	</target>

	<target name="all" depends="compile.js">
		<echo message="Build completed." />
		<concat destfile="${build.dir}/countdown.demo.js">
			<fileset file="${build.dir}/antixss.js" />
			<fileset file="${build.dir}/countdown.min.js" />
		</concat>
	</target>

</project>