import type { PdfChunk, PdfIndex } from "./types.js";
export type LoadResult = {
    index: PdfIndex;
    stats: {
        cached: number;
        extracted: number;
        chunks: number;
    };
};
/**
 * Extract → chunk → BM25-index a set of PDF paths. Cached on disk by content
 * hash so re-runs skip re-extraction. Returns an empty-but-valid index when
 * `paths` is empty.
 */
export declare function loadPdfs(paths: string[], cacheDir: string): Promise<LoadResult>;
/**
 * Section-aware sliding-window chunker. Splits text on blank-line paragraphs,
 * tags each paragraph with the most recent heading line, then packs into
 * ~CHUNK_SIZE-char chunks with CHUNK_OVERLAP. Headings stay attached so
 * retrieved excerpts carry their context.
 */
export declare function chunkText(text: string, source: string, hash: string): PdfChunk[];
export declare function emptyIndex(): PdfIndex;
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