/**
 * errorCheck — scan workbook for Excel error values.
 *
 * Ported from client/shared/src/lib/spreadsheet/error-check/error-checker.ts
 * and client/shared/src/lib/spreadsheet/spreadjs/workbook/WorkbookProxy.ts.
 *
 * Runs entirely on top of the SDK's Workbook/Worksheet API — no SpreadJS dependency.
 */
import type { Workbook } from '../sdk-types.js';
/**
 * Check workbook for error values (#REF!, #DIV/0!, #NAME?, etc.).
 *
 * @param wb - The workbook to check.
 * @param ranges - Optional list of targets. Each is either a sheet name ("Sheet1")
 *   to scan the entire sheet, or a range with sheet name ("Sheet1!A1:D50").
 *   If omitted, checks all sheets.
 * @returns Formatted error summary, or "No issues found."
 */
export declare function errorCheck(wb: Workbook, ranges?: string[]): Promise<string>;
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