/**
 * BM25 metric — full-text search scoring via FTS5.
 */
import type { SearchDatabase } from "../db.js";
/**
 * Compute BM25 scores for a query using FTS5.
 * Returns a Map of chunkId → normalized score (0-1, higher = more relevant).
 */
export declare function computeBm25Scores(db: SearchDatabase, query: string, limit: number): Map<number, number>;
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