import { Logger } from '../../utils/logger';
export declare class RerankingService {
    private logger;
    private cohere;
    private enabled;
    constructor(logger: Logger);
    /**
     * Reranks a list of documents based on a query.
     * @param query The search query
     * @param documents Array of document strings to rerank
     * @param topN Number of top results to return
     * @returns Array of indices of the documents in the original list, ordered by relevance.
     */
    rerank(query: string, documents: string[], topN?: number): Promise<number[]>;
    /**
     * A simple local reranker based on keyword overlap.
     * It counts how many unique query terms appear in the document.
     */
    private localRerank;
}
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