import { EventEmitter } from "eventemitter3";
import { Channel } from "./Channel";
import { ParallelChannel } from "./ParallelChannel";
/**
 * ChannelQueue class, for managing channels
 * @augments EventEmitter
 */
export declare class ChannelQueue extends EventEmitter {
    private _channels;
    constructor();
    /**
     * The channels
     * @type {Object}
     */
    get channels(): Record<string, Channel | ParallelChannel>;
    /**
     * Create a new channel
     * @param {String} name The channel name
     * @returns {Channel} The new channel
     * @throws {Error} Throws if the channel already exists
     */
    createChannel(name: string): Channel;
    /**
     * Create a new parallel channel
     * Creates a special channel that supports running several tasks in parallel.
     * @param {String} name The name of the channel
     * @param {Number=} parallelism Optional number of maximum parallel tasks
     * @returns {ParallelChannel} The new channel
     * @throws {Error} Throws if the channel already exists
     */
    createParallelChannel(name: string, parallelism?: number): ParallelChannel;
    /**
     * Get channel by name
     * Creates a new channel automatically if it doesn't yet exist
     * @param {String} name The channel name
     * @returns {Channel} The channel which was requested
     */
    channel(name: string): Channel;
    /**
     * Check if a channel exists
     * @param {String} name The name of the channel
     * @returns {Boolean} True if it exists
     */
    channelExists(name: string): boolean;
}