/**
 * MarkItDown converter — file-to-Markdown using the standalone MarkItDown binary.
 *
 * Microsoft MarkItDown (MIT license) converts PDF, DOCX, PPTX, XLSX, CSV, HTML,
 * images, EPUB, XML, and JSON to Markdown. The binary is a PyInstaller-compiled
 * standalone executable shipped with the DKG node.
 *
 * Spec: 05_PROTOCOL_EXTENSIONS.md §6.5.1
 */
import type { ExtractionPipeline, ExtractionInput, ConverterOutput } from '@origintrail-official/dkg-core';
export declare const _markitdownConverterIo: {
    existsSync: (path: any) => boolean;
    execFileSync: (...args: any[]) => any;
    consoleWarn: (...args: any[]) => void;
    resetBinCache: () => void;
};
export declare function isMarkItDownAvailable(): boolean;
export declare const MARKITDOWN_CONTENT_TYPES: readonly ["application/pdf", "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "application/vnd.openxmlformats-officedocument.presentationml.presentation", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "text/csv", "text/html", "application/epub+zip", "application/xml", "text/xml"];
export declare class MarkItDownConverter implements ExtractionPipeline {
    readonly contentTypes: ("application/pdf" | "text/html" | "text/csv" | "application/vnd.openxmlformats-officedocument.wordprocessingml.document" | "application/vnd.openxmlformats-officedocument.presentationml.presentation" | "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" | "application/xml" | "application/epub+zip" | "text/xml")[];
    extract(input: ExtractionInput): Promise<ConverterOutput>;
}
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