code: function exportVis(url, dest, callback) {
      if (dest === undefined) dest = '.';
  
      (0, _mkdirp2['default'])(dest, function (err) {
          if (err && callback) return callback(err);
          if (!isVisUrl(url)) {
              url = getVisUrl(url);
          }
          getVisJson(url, _path2['default'].join(dest, 'viz.json'), function (err, visJson) {
              downloadVisualizationData(visJson, dest, callback);
          });
      });
  }
docs: Export a visualization at the given url.
  
  @param {String} url the visualization's url
  @param {String} dest the directory to export the visualization into
  
  @example
  exportVis('https://eric.cartodb.com/api/v2/viz/85c59718-082c-11e3-86d3-5404a6a69006/viz.json', 'my_vis');