Function isSubRowSelected

packages/table-core/src/features/RowSelection.ts:629–668

(
  row: Row<TData>,
  selection: Record<string, boolean>,
  table: Table<TData>
)

}

export function isSubRowSelected<TData extends RowData>(
  row: Row<TData>,
  selection: Record<string, boolean>,
  table: Table<TData>
): boolean | 'some' | 'all' {
  if (!row.subRows?.length) return false

  let allChildrenSelected = true
  let someSelected = false

  row.subRows.forEach(subRow => {
    // Bail out early if we know both of these
    if (someSelected && !allChildrenSelected) {
      return
    }

    if (subRow.getCanSelect()) {
      if (isRowSelected(subRow, selection)) {
        someSelected = true
      } else {
        allChildrenSelected = false
      }
    }

    // Check row selection of nested subrows
    if (subRow.subRows && subRow.subRows.length) {
      const subRowChildrenSelected = isSubRowSelected(subRow, selection, table)
      if (subRowChildrenSelected === 'all') {
        someSelected = true
      } else if (subRowChildrenSelected === 'some') {
        someSelected = true
        allChildrenSelected = false
      } else {
        allChildrenSelected = false
      }
    }
  })

  return allChildrenSelected ? 'all' : someSelected ? 'some' : false
}