docs: function getImageSize(fields) {
  
                  if(fields.type!='image'){
                    return;
                  }
  
                  if(!fields.size){
                    return;
                  }
  
                  return probe(helpers.get_media(fields.location))
                    .then(function(size){
                      fields.image = {
                        width: size.width,
                        height: size.height
                      };
                    });
                }