import type { SearchResult } from "./hybrid.js";
/**
 * Maximal Marginal Relevance re-ranking. Given a set of scored search results,
 * greedily selects items that maximize:
 *
 *   lambda * relevance - (1 - lambda) * max_similarity_to_already_selected
 *
 * This preserves relevance while penalizing redundancy -- especially useful
 * when multiple hub cards or similar flow cards appear in the results.
 */
export declare function mmrRerank(results: SearchResult[], topK: number): SearchResult[];
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