How to use the less/tree.Combinator function in less

combinator: function () {
                var match;
                if (match = $(/[+>~]/g) || $('&') || $(/::/g)) {
                    return new(tree.Combinator)(match);
                } else {
                    return new(tree.Combinator)(input.charAt(i - 1) === " " ? " " : null);
                }
            },

tree.Element = function Element(combinator, value) {
    this.combinator = combinator instanceof tree.Combinator ?
                      combinator : new(tree.Combinator)(combinator);
    this.value = value.trim();
};
tree.Element.prototype.toCSS = function () {

tree.Element = function Element(combinator, value) {
    this.combinator = combinator instanceof tree.Combinator ?
                      combinator : new(tree.Combinator)(combinator);
    this.value = value.trim();
};
tree.Element.prototype.toCSS = function (env) {

combinator: function () {
                var match;
                if (match = $(/[+>~]/g) || $('&') || $(/::/g)) {
                    return new(tree.Combinator)(match);
                } else {
                    return new(tree.Combinator)(input.charAt(i - 1) === " " ? " " : null);
                }
            },

combinator: function () {
                var match;
                if (match = $(/[+>~]/g) || $('&') || $(/::/g)) {
                    return new(tree.Combinator)(match);
                } else {
                    return new(tree.Combinator)(input.charAt(i - 1) === " " ? " " : null);
                }
            },

combinator: function () {
                var match;
                if (match = $(/[+>~]/g) || $('&') || $(/::/g)) {
                    return new(tree.Combinator)(match);
                } else {
                    return new(tree.Combinator)(input.charAt(i - 1) === " " ? " " : null);
                }
            },

combinator: function () {
                var match;
                if (match = $(/[+>~]/g) || $('&') || $(/::/g)) {
                    return new(tree.Combinator)(match);
                } else {
                    return new(tree.Combinator)(input.charAt(i - 1) === " " ? " " : null);
                }
            },

tree.Element = function Element(combinator, value) {
    this.combinator = combinator instanceof tree.Combinator ?
                      combinator : new(tree.Combinator)(combinator);
    this.value = value.trim();
};
tree.Element.prototype.toCSS = function () {

combinator: function () {
                var match;
                if (match = $(/[+>~]/g) || $('&') || $(/::/g)) {
                    return new(tree.Combinator)(match);
                } else {
                    return new(tree.Combinator)(input.charAt(i - 1) === " " ? " " : null);
                }
            },