How to use the emmet.expandAbbreviation function in emmet

var getElement = function (domExpression, query) {
    var htmlCode = emmet.expandAbbreviation(domExpression, {html: 'xhtml'});
    var document = parse(htmlCode);
    return document.querySelector(query || getFirstTag(domExpression));
};

var getElement = function (domExpression) {
        var htmlCode = emmet.expandAbbreviation(domExpression, {html: 'xhtml'});
        var document = parse(htmlCode);
        var element = document.querySelector('#target') || document.getElementsByTagName(tag)[0];
        return element;
    };

var getElement = function (domExpression, query) {
    var htmlCode = emmet.expandAbbreviation(domExpression, {html: 'xhtml'});
    var document = parse(htmlCode);
    return document.querySelector(query || getFirstTag(domExpression));
};

template.addHelper('zen', function (value) {
  return emmet.expandAbbreviation(value);
});

function getHTMLElement(template) {
  const html = expand(template);
  const doc = new JSDOM().window.document;
  const dom = doc.createElement('div');
  dom.innerHTML = html;
  return dom.firstChild;
}