docs: function (mergeTo, mergeFrom, classpathTo) {
          var hasEvents = false;
          for (var k in mergeFrom) {
              if (mergeFrom.hasOwnProperty(k)) {
                  if (!hasEvents) {
                      hasEvents = true;
                  }
                  // The comparison with null below is important, as an empty string is a valid event description.
                  if (mergeTo[k] != null) {
                      Aria.$logError(Aria.REDECLARED_EVENT, [k, classpathTo]);
                  } else {
                      mergeTo[k] = mergeFrom[k];
                  }
              }
          }
          return hasEvents;
      }