ESLint's
checkstyleformatter as a standalone package
<?xml version="1.0" encoding="utf-8"?><checkstyle version="4.3"><file name="foo.js"><error line="5" column="10" severity="error" message="Unexpected foo. (foo)" source="eslint.rules.foo" /></file><file name="bar.js"><error line="6" column="11" severity="warning" message="Unexpected bar. (bar)" source="eslint.rules.bar" /></file><file name="baz.js"><error line="1" column="1" severity="error" message="Fatal error parsing file." source="" /></file></checkstyle>