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

opacity: function(color, amount) {
        var alpha = number(amount) * (color.alpha || 1.0);
        return new(tree.Color)(color.rgb, number(amount));
    },
    saturate: function (color, amount) {

color: function () {
                    var rgb;

                    if (input.charAt(i) === '#' && (rgb = $(/#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})/g))) {
                        return new(tree.Color)(rgb[1]);
                    }
                },

color: function () {
                    var rgb;

                    if (input.charAt(i) === '#' && (rgb = $(/#([a-fA-F0-9]{6}|[a-fA-F0-9]{3})/g))) {
                        return new(tree.Color)(rgb[1]);
                    }
                },

rgba: function (r, g, b, a) {
        var rgb = [r, g, b].map(function (c) { return number(c) }),
            a = number(a);
        return new(tree.Color)(rgb, a);
    },
    hsl: function (h, s, l) {

operate: function (op, other) {
        var result = [];

        if (! (other instanceof tree.Color)) {
            other = other.toColor();
        }

        for (var c = 0; c < 3; c++) {
            result[c] = tree.operate(op, this.rgb[c], other.rgb[c]);
        }
        return new(tree.Color)(result);
    },

opacity: function(color, amount) {
        var alpha = number(amount) * (color.alpha || 1.0);
        return new(tree.Color)(color.rgb, number(amount));
    },
    saturate: function (color, amount) {

rgba: function (r, g, b, a) {
        var rgb = [r, g, b].map(function (c) { return number(c) }),
            a = number(a);
        return new(tree.Color)(rgb, a);
    },
    hsl: function (h, s, l) {

operate: function (op, other) {
        var result = [];

        if (! (other instanceof tree.Color)) {
            other = other.toColor();
        }

        for (var c = 0; c < 3; c++) {
            result[c] = tree.operate(op, this.rgb[c], other.rgb[c]);
        }
        return new(tree.Color)(result);
    },

operate: function (op, other) {
        var result = [];

        if (! (other instanceof tree.Color)) {
            other = other.toColor();
        }

        for (var c = 0; c < 3; c++) {
            result[c] = tree.operate(op, this.rgb[c], other.rgb[c]);
        }
        return new(tree.Color)(result);
    },

rgba: function (r, g, b, a) {
        var rgb = [r, g, b].map(function (c) { return number(c) }),
            a = number(a);
        return new(tree.Color)(rgb, a);
    },
    hsl: function (h, s, l) {