import { Entry } from '@yuihub/core';
import { IVectorStore, SearchResult } from './vector-store-types.js';
/**
 * CompositeVectorStore
 * Manages multiple VectorStore instances (Dual Embedding).
 * - Writes to ALL stores (Fan-out).
 * - Searches from ALL stores and merges using RRF.
 */
export declare class CompositeVectorStore implements IVectorStore {
    private stores;
    constructor(stores: IVectorStore[]);
    init(): Promise<void>;
    add(entries: Entry[]): Promise<void>;
    isEmpty(): Promise<boolean>;
    deleteBySource(source: string): Promise<number>;
    search(query: string, limit?: number, filter?: {
        tag?: string;
        session?: string;
    }): Promise<SearchResult[]>;
}
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