build.xml

<project name="edep" default="xar">
    <property name="npm" value="npm"/>
    <target name="npm.install">
        <exec executable="${npm}" outputproperty="install.output">
            <arg line="install"/>
        </exec>
        <echo message="${install.output}"/>
    </target>
    <target name="clean">
        <exec executable="${npm}" outputproperty="clean.output">
            <arg line="run"/>
            <arg line="clean"/>
        </exec>
        <echo message="${clean.output}"/>
    </target>
    <target name="prepare" depends="npm.install,clean">
        <exec executable="${npm}" outputproperty="build.output">
            <arg line="run"/>
            <arg line="build"/>
        </exec>
        <echo message="${build.output}"/>
    </target>
    <target name="xar" depends="prepare">
        <exec executable="${npm}" outputproperty="xar.output">
            <arg line="run"/>
            <arg line="xar"/>
        </exec>
        <echo message="${xar.output}"/>
    </target>
</project>