import { SheetDoc } from '../../core/ir/sheet.js';
/**
 * Read a legacy `.xls` (BIFF8) workbook into a {@link SheetDoc} — the same IR
 * tree the OOXML xlsx reader produces. Reads the workbook globals (sheet
 * directory, shared strings, date system, styles, defined names, Escher BLIP
 * store) and each worksheet substream's cells, styling and overlays.
 *
 * @param xls The `.xls` bytes (an OLE2/CFB container holding a `Workbook` stream).
 * @returns The parsed spreadsheet IR tree.
 * @throws Error on a non-OLE / non-BIFF8 input or a workbook with no worksheets
 *   (the reader's sniff keeps malformed inputs away); a structurally odd record
 *   is skipped, never fatal.
 */
export declare function readXlsToSheetDoc(xls: Uint8Array): SheetDoc;
/**
 * §2.5.198.5 RkNumber — decode a packed 30-bit number: bit 0 means ÷100, bit 1
 * selects integer vs. the 30 high bits of an IEEE double. Exported for unit tests
 * (the int / ×100 / IEEE paths).
 */
export declare function decodeRk(rk: number): number;
/**
 * §2.4.265 SST — read the shared-string table: `cstTotal`/`cstUnique` then
 * `cstUnique` rich strings, via a continuation-aware reader (a string can split
 * across a CONTINUE boundary, and the byte after the boundary is a fresh
 * `fHighByte` flag for the rest). Exported for unit tests of the continuation
 * handling.
 *
 * @param blocks The SST record's data followed by each CONTINUE record's data.
 * @returns The unique shared strings, in index order.
 */
export declare function readSst(blocks: ReadonlyArray<Uint8Array>): Array<string>;