code: function downloadNode(next) {
          if (fs.existsSync(nodeFilePath)) return next();
  
          var uri = framework;
  
          if (framework === 'node') {
            uri = 'nodejs'; // if node, use nodejs uri
          } else if (framework === 'nodejs') {
            framework = 'node'; // support nodejs, and node, as framework.
          }
  
          var type = global.type;
          var url,
            prefix = 'https://' + uri + '.org/dist';
  
          if (version === 'latest') {
            url = prefix + '/' + framework + '-' + version + '.tar.gz';
          } else {
            url =
              prefix +
              '/v' +
              version +
              '/' +
              framework +
              '-v' +
              version +
              '.tar.gz';
          }
  
          _log('downloading %s', url);
  
          var output = fs.createWriteStream(nodeFilePath, {
            flags: 'w+',
          });
  
          // need to set user-agent to bypass some corporate firewalls
          var requestOptions = {
            url: url,
            headers: {
              'User-Agent': 'Node.js',
            },
          };
  
          _logProgress(request(requestOptions)).pipe(output);
  
          output.on('close', function() {
            next();
          });
        }
docs: download node into the target directory