RenderRow

Discriminated union of row types in the flattened render model.

The grouping plugin transforms the grid’s row array into a flat list of RenderRow items that the virtualization engine iterates over. Each item is either a GroupRowModelItem (group header) or a DataRowModelItem (leaf data row). Use the kind property to discriminate:

for (const row of flattenedRows) {
  if (row.kind === 'group') {
    renderGroupHeader(row);   // row is GroupRowModelItem
  } else {
    renderDataRow(row);       // row is DataRowModelItem
  }
}

type RenderRow = GroupRowModelItem | DataRowModelItem