import { RedisClient } from 'redis';
export declare function open(): RedisClient;
export declare function close(client: RedisClient): void;
export declare function set(client: RedisClient, key: string, value: any): Promise<string>;
/**
 * Get the value of a key.
 */
export declare function get<T = string>(client: RedisClient, key: string): Promise<T | null>;
/**
 * Delete a key.
 */
export declare function remove(client: RedisClient, key: string | string[]): Promise<number>;
/**
 * Set a key's time to live in seconds.
 */
export declare function expire(client: RedisClient, key: string, seconds: number): Promise<number>;