There is no definition of type in the WorkbookSheetRow definition (line 21897 in kendo.all.d.ts):
interface WorkbookSheetRow {
cells?: WorkbookSheetRowCell[];
index?: number;
height?: number;
}
The values of the sheets.rows.type: https://docs.telerik.com/kendo-ui/api/javascript/ooxml/workbook/configuration/sheets.rows.type