/**
 * Interface for optimized vector index operations
 */
export interface VectorIndex {
    /**
     * Add a vector to the index
     * @param id Unique identifier for the vector
     * @param vector The vector to add
     */
    addVector(id: string, vector: number[]): Promise<void>;
    /**
     * Search for nearest neighbors
     * @param vector The query vector
     * @param limit Maximum number of results to return
     * @returns Promise resolving to array of results with id and similarity score
     */
    search(vector: number[], limit: number): Promise<{
        id: string;
        score: number;
    }[]>;
    /**
     * Remove a vector from the index
     * @param id ID of the vector to remove
     */
    removeVector(id: string): Promise<void>;
    /**
     * Get index statistics
     * @returns Object with index statistics
     */
    getStats(): {
        totalVectors: number;
        dimensionality: number;
        indexType: string;
        memoryUsage: number;
        approximateSearch?: boolean;
        quantized?: boolean;
    };
    /**
     * Enable or disable approximate nearest neighbor search
     * @param enable Whether to enable approximate search
     */
    setApproximateSearch(enable: boolean): void;
    /**
     * Enable or disable vector quantization for memory optimization
     * @param enable Whether to enable quantization
     */
    setQuantization(enable: boolean): void;
}