How to use the jsdom/lib/jsdom/browser/domtohtml.domToHtml function in jsdom

XMLSerializer.prototype.serializeToString = function(node) {
	var text = domToHtml(node);
	// Fix a jsdom issue where all SVG tagNames are lowercased:
	// https://github.com/tmpvar/jsdom/issues/620
	var tagNames = ['linearGradient', 'radialGradient', 'clipPath'];
	for (var i = 0, l = tagNames.length; i < l; i++) {
		var tagName = tagNames[i];
		text = text.replace(
			new RegExp('(<|

function getText(element) {
    return domToHtml(element._childNodes, true, true);
}

function getText(el) {
    return domToHtml(el._childNodes, true, true);
}

get internalText() {
        if (!('_text' in this)) {
            if (this._parseTree) {
                this._text = domtohtml.domToHtml(this._parseTree, !this.isPretty);
            } else {
                this._text = this._replaceTemplates(this._getTextFromRawSrc());
            }
        }

        return this._text;
    },