import { EventEmitter } from "events";
import type { ServerId } from "socket.io-adapter";
export interface DiscoveryClientOptions {
    url: string;
    uid: ServerId;
    address: string;
    token?: string;
    /** Initial reconnect delay in ms. Doubles on every failure up to `maxBackoffMs`. */
    initialBackoffMs?: number;
    /** Maximum reconnect delay in ms. */
    maxBackoffMs?: number;
}
/**
 * Connects to the discovery service and emits `peer-list` events whenever the
 * server pushes an updated roster. Reconnects with exponential backoff on
 * disconnect.
 */
export declare class DiscoveryClient extends EventEmitter {
    private readonly url;
    private readonly uid;
    private readonly address;
    private readonly token?;
    private readonly initialBackoffMs;
    private readonly maxBackoffMs;
    private ws;
    private reconnectTimer;
    private backoffMs;
    private closed;
    constructor(opts: DiscoveryClientOptions);
    connect(): void;
    private scheduleReconnect;
    close(): Promise<void>;
}
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