import type Database from 'better-sqlite3';
import { type FtsResult, type LabelFilter } from './fts-store-search.js';
/** Content words of a query: lowercased, stopwords and 1–2 letter tokens dropped. */
export declare function contentWords(query: string): string[];
/**
 * Stemmed BM25 over `node_summaries_fts`. Terms are OR-ed — a natural-language
 * question rarely repeats every word a symbol is described with — and BM25
 * rewards the symbols that match the most of them. Returns `[]` for queries
 * with fewer than `minWords` (default two) content words (a bare identifier is the lexical path's
 * job) or when the table is missing/empty (index built before summaries).
 */
export declare function summarySearch(db: Database.Database, query: string, limit: number, label?: LabelFilter, minWords?: number): FtsResult[];
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