code: function(bucket, callback) {
      var s3 = new AWS.S3({maxRetries: 100});
      var params = {
        Bucket: bucket
      };
  
      s3.listObjects(params, function (err, data) {
        if (err) return callback(err);
        if (data.Contents.length > 0) {
          params.Delete = { Objects: [] };
          data.Contents.forEach(function (item) {
            params.Delete.Objects.push({Key: item.Key});
          });
          s3.deleteObjects(params, callback);
        } else {
          callback();
        }
      });
    }
docs: Delete objects.