Wrap less.render() in a Promise for using with `co` or directly

gistfile1.js

/**
 * Module dependencies
 */

var less = require('less');


// wrap less.render() in a native Promise

module.exports = function(code, options) {

  return new Promise(function(resolve, reject) {

    less.render(code, options, function(err, output) {
      if (err) return reject(err);
      resolve(output.css);
    });

  });

};