stripIndent = function (str) {
            var match = str.match(/^[ \t]*(?=\S)/gm);

            if (!match) return str;

            var indent = Math.min.apply(Math, match.map(function (el) {
                return el.length;
            }));

            var re = new RegExp('^[ \\t]{' + indent + '}', 'gm');

            return indent > 0 ? str.replace(re, '') : str;
        }
override tag method to know which tags exist