requestHTML-Promise.js

function requestHTML(url) {
  return new Promise(function(resolve, reject){
    request(url, function (err, res, body) {
      if (err) reject(err);
      if (!body) reject(new Error('not an html'));
      
      resolve(body);
    });
  });
});

requestHTML('http://google.com')
  .then(function(html){
    //hacer algo con el html?
    console.log(html);
  })
  .catch(function(err){
    //hacer algo con el err?
    console.log(err);
  });