Row selection

enableRowSelection adds a checkbox column and a select all checkbox. Selection survives sorting and filtering. enableMultiRowSelection={false} allows one row at a time.

<ShadcnHeadlessTable
  {columns}
  {data}
  enableRowSelection
  getRowId={(row) => row.id}
  onSelectionChange={(rows) => (selected = rows)}
/>

• Without getRowId a row’s id is its index in data, so ids change when the data does.
• table.selectedRows has the selected items, table.toggleRow(id) and table.toggleAllRows() change the selection.
• initialState={{ selectedRows: ['a', 'b'] }} starts with rows selected.
• onRowClick runs when a row is clicked.