text: var path = require('path');
  var fs = require('fs');
  var ytdl = require('..');
  
  function playlist(url) {
  
      'use strict';
      var video = ytdl(url);
  
      video.on('error', function error(err) {
          console.log(err.stack);
      });
  
      var size = 0;
      video.on('info', function(info) {
          size = info.size;
          var output = path.join(__dirname + '/', size + '.mp4');
          video.pipe(fs.createWriteStream(output));
      });
  
      var pos = 0;
      video.on('data', function data(chunk) {
          pos += chunk.length;
          // `size` should not be 0 here.
          if (size) {
              var percent = (pos / size * 100).toFixed(2);
              process.stdout.cursorTo(0);
              process.stdout.clearLine(1);
              process.stdout.write(percent + '%');
          }
      });
  
      video.on('next', playlist);
  
  }
  
  playlist('https://www.youtube.com/playlist?list=PLEFA9E9D96CB7F807');