import { RedisClientOptions } from 'redis';
import { Server } from '../server';
export type RedisMessage = {
    event: string;
    channel: string;
    message: string;
};
export declare const RedisKey: {
    CLIENTS: string;
};
/**
 * This is mainly used to propagate events to other instances when running node in a cluster.
 */
export declare class RedisTransport {
    opts: RedisClientOptions;
    pub: any;
    sub: any;
    server: Server;
    static defaultRedisOpts: RedisClientOptions;
    constructor(server: Server, opts: RedisClientOptions | boolean);
    private connect;
    publish(event: string, channel: string, message: string): Promise<any>;
    close(): Promise<void>;
    getStats(): Promise<{
        clientCount: number;
        userCount: number;
        users: unknown[];
    }>;
}