/**
 * XLSX converter for DocShell
 *
 * Uses xlsx library for extraction
 * Output format:
 * # Sheet: <name>
 * | col1 | col2 | col3 |
 * | --- | --- | --- |
 * | val1 | val2 | val3 |
 * (Truncated: rows=200, cols=50)
 */
import type { ConversionResult, DocShellConfig, OutlineItem } from '../types/index.js';
import { type Converter } from './base.js';
export declare class XlsxConverter implements Converter {
    convert(filepath: string, config: DocShellConfig): Promise<ConversionResult>;
    extractOutline(filepath: string, config: DocShellConfig): Promise<OutlineItem[]>;
}