/**
 * LLM-powered Metadata Extractor
 *
 * Extracts structured metadata from document chunks using language models.
 * Supports title, summary, keywords, Q&A pairs, and custom schema extraction.
 */
import type { Chunk, ExtractParams, ExtractionResult } from "../../types/index.js";
/**
 * LLM-powered metadata extractor
 * Extracts title, summary, keywords, Q&A pairs, and custom schema data
 */
export declare class LLMMetadataExtractor {
    private provider;
    private modelName;
    constructor(options?: {
        provider?: string;
        modelName?: string;
    });
    /**
     * Extract metadata from chunks based on configuration
     * @param chunks - Array of chunks to extract metadata from
     * @param params - Extraction parameters
     * @returns Array of extraction results, one per chunk
     */
    extract(chunks: Chunk[], params: ExtractParams): Promise<ExtractionResult[]>;
    /**
     * Group chunks by document ID
     */
    private groupByDocument;
    /**
     * Extract title from document chunks
     */
    private extractTitle;
    /**
     * Extract summary from a chunk
     */
    private extractSummary;
    /**
     * Extract keywords from a chunk
     */
    private extractKeywords;
    /**
     * Extract Q&A pairs from a chunk
     */
    private extractQuestions;
    /**
     * Extract custom schema data from a chunk
     */
    private extractCustom;
    /**
     * Parse Q&A pairs from LLM response
     */
    private parseQAPairs;
    /**
     * Call the LLM with a prompt
     */
    private callLLM;
}
/**
 * Convenience function to extract metadata from chunks
 * @param chunks - Chunks to process
 * @param params - Extraction parameters
 * @param options - Extractor options
 * @returns Extraction results
 */
export declare function extractMetadata(chunks: Chunk[], params: ExtractParams, options?: {
    provider?: string;
    modelName?: string;
}): Promise<ExtractionResult[]>;