import { Client, ClientEvents } from 'discord.js';
type EventKey = keyof ClientEvents;
type EventListener<K extends EventKey> = (...args: ClientEvents[K]) => Promise<void> | void;
/**
 * Clean event handler — register all your client events in one place,
 * then call `.attach(client)` to bind them all at once.
 *
 * @example
 * const events = new EventHandler()
 *   .on('ready',        (client) => console.log(`Logged in as ${client.user.tag}`))
 *   .on('guildMemberAdd', (member) => console.log(`${member.user.tag} joined`))
 *   .once('ready',      (client) => console.log('Bot is ready!'));
 *
 * events.attach(client);
 */
export declare class EventHandler {
    private entries;
    /**
     * Register a persistent event listener.
     * @returns `this` for chaining
     */
    on<K extends EventKey>(event: K, listener: EventListener<K>): this;
    /**
     * Register a one-time event listener.
     * @returns `this` for chaining
     */
    once<K extends EventKey>(event: K, listener: EventListener<K>): this;
    /**
     * Bind all registered listeners to a discord.js Client.
     * @returns `this` for chaining
     */
    attach(client: Client): this;
    /** Return the number of registered listeners */
    get size(): number;
}
export {};
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