
                    return extra ? '\n' + extra : '';
                  }
                }
              },
              onClick: (_mouseEvent, activeElems) => {
                if (activeElems.length === 0) {
                  return;
                }
                // XXX: Undocumented. How can we know the index?
                const index = activeElems[0]._index;
                const url = dataset[index].commit.url;
                window.open(url, '_blank');
              },
            };

     