/**
 * Redis Utilities for NeuroLink
 * Helper functions for Redis storage operations
 */
import type { RedisClient, RedisConversationObject, RedisStorageConfig } from "../types/index.js";
/**
 * Get a pooled Redis connection. Multiple callers with the same host:port:db
 * share a single connection, reducing connection count.
 */
export declare function getPooledRedisClient(config: Required<RedisStorageConfig>): Promise<RedisClient>;
/**
 * Release a pooled Redis connection. Only closes when refCount reaches 0.
 */
export declare function releasePooledRedisClient(config: Required<RedisStorageConfig>): Promise<void>;
/**
 * Get stats about the connection pool
 */
export declare function getPoolStats(): Array<{
    key: string;
    refCount: number;
    isOpen: boolean;
}>;
/**
 * Creates a Redis client with the provided configuration
 */
export declare function createRedisClient(config: Required<RedisStorageConfig>): Promise<RedisClient>;
/**
 * Generates a Redis key for session messages
 */
export declare function getSessionKey(config: Required<RedisStorageConfig>, sessionId: string, userId?: string): string;
/**
 * Generates a Redis key for user sessions mapping
 */
export declare function getUserSessionsKey(config: Required<RedisStorageConfig>, userId: string): string;
/**
 * Serializes conversation object for Redis storage
 */
export declare function serializeConversation(conversation: RedisConversationObject): string;
/**
 * Deserializes conversation object from Redis storage
 */
export declare function deserializeConversation(data: string | Buffer | null): RedisConversationObject | null;
/**
 * Checks if Redis client is healthy
 */
export declare function isRedisHealthy(client: RedisClient): Promise<boolean>;
/**
 * Scan Redis keys matching a pattern without blocking the server
 * This is a non-blocking alternative to the KEYS command
 *
 * @param client Redis client
 * @param pattern Pattern to match keys (e.g. "prefix:*")
 * @param batchSize Number of keys to scan in each iteration (default: 100)
 * @returns Array of keys matching the pattern
 */
export declare function scanKeys(client: RedisClient, pattern: string, batchSize?: number): Promise<string[]>;
/**
 * Get normalized Redis configuration with defaults
 */
export declare function getNormalizedConfig(config: RedisStorageConfig): Required<RedisStorageConfig>;