import type { PdfIndex, RetrievedExcerpts } from "./types.js";
/** Default per-LLM-call PDF excerpt budget (characters). */
export declare const PDF_EXCERPT_BUDGET = 1500;
/**
 * BM25-score every chunk in the index against `query`, then pack the highest
 * scorers into a character budget. Returns formatted excerpts with a
 * `[source: <file> § <section>]` header so the LLM can attribute claims.
 *
 * Safe to call when the index is empty or undefined — returns no excerpts.
 */
export declare function retrieveExcerpts(index: PdfIndex | undefined, query: string, budgetChars?: number): RetrievedExcerpts;
/**
 * Format excerpts as a single labelled block for prompt injection. Returns
 * empty string when no excerpts — callers can concatenate unconditionally.
 */
export declare function formatExcerptBlock(retrieved: RetrievedExcerpts, label?: string): string;
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