less.js/lib/less/tree/directive.js

if (typeof(require) !== 'undefined') { var tree = require('less/tree') }

tree.Directive = function Directive(name, value) {
    this.name = name;
    if (Array.isArray(value)) {
        this.rules = value;
    } else {
        this.value = value;
    }
};
tree.Directive.prototype.toCSS = function () {
    if (this.rules) {
        return this.name + " {\n  " +
               this.rules.map(function (r) {
                   return r.toCSS();
               }).join("\n  ") + "\n}\n";
    } else {
        return this.name + ' ' + this.value.toCSS() + ';\n';
    }
};