import { BuiltinSource } from '../base.js';
import type { SourceOptions, SourceResult } from '../types.js';
/**
 * PDF source - extracts text from PDF documents
 *
 * Supports:
 * - Local PDF files
 * - Remote PDF URLs
 *
 * Requires: pdf-parse package
 */
export declare class PdfSource extends BuiltinSource {
    name: string;
    description: string;
    private pdfParse;
    isAvailable(): Promise<boolean>;
    fetch(identifier: string, options?: SourceOptions): Promise<SourceResult>;
    private fetchFromFile;
    private fetchFromUrl;
    private formatPdfContent;
    private addMarkdownStructure;
    getHelp(): string;
}
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