import { Peer } from '../core';
export declare class PubSub {
    private parent;
    constructor(parent: Peer);
    private checkOnlineAndEnabled;
    publish(topics: string | string[], messages: any | any[]): Promise<void>;
    /**
     * Subscribe the given handler to a pubsub topic
     *
     * @param topic - The topic to listen on.
     * @param handler - The handler to subscribe.
     *
     * @example <caption>Subscribe a handler to a topic</caption>
     *
     * const handler = (message) => { }
     * await peer.pubsub.subscribe(topic, handler)
     */
    subscribe(topics: string | string[], handler: Function): Promise<void>;
    /**
     * Unsubscribes from a pubsub topic
     *
     * @param topic - The topic to listen on.
     * @param handler - The handler to unsubscribe from.
     *
     * @example <caption>Unsubscribe a topic for all handlers</caption>
     *
     * await peer.pubsub.unsubscribe(topic, undefined)
     *
     * @example <caption>Unsubscribe a topic for 1 handler</caption>
     *
     * await peer.pubsub.unsubscribe(topic, handler)
     */
    unsubscribe(topic: string, handler?: Function): Promise<void>;
    ls(): Promise<void>;
    peers(topic: string): Promise<string[] | undefined>;
    setMaxListeners(n: number): Promise<any> | undefined;
}