code: function _buildTraceData(chain) {
    return function(ex, cb) {
      parser.parseException(ex, function (err, errData) {
        if (err) {
          return cb(err);
        }
  
        chain.push({
          frames: errData.frames,
          exception: {
            class: errData['class'],
            message: errData.message
          }
        });
  
        return cb(null);
      });
    };
  }
docs: Helpers *