import { AbstractSocket, SocketClientOptions, SocketMessage } from "./types";
export declare class SocketClient<MessageType = unknown, HeadersType = Record<string, unknown>> {
    private readonly socket;
    private readonly options;
    private isConnected;
    private messageQueue;
    private subscriptions;
    private rateLimiter?;
    private heartbeatIntervalId?;
    constructor(socket: AbstractSocket, options: SocketClientOptions<MessageType, HeadersType>);
    connect(): Promise<void>;
    send(message: SocketMessage<MessageType, HeadersType>): Promise<void>;
    subscribe(messageType: string, handler: (message: SocketMessage<MessageType, HeadersType>) => void): void;
    unsubscribe(messageType: string): void;
    disconnect(): Promise<void>;
    private handleMessage;
    private startHeartbeat;
    private stopHeartbeat;
    private enqueueMessage;
    private processRateLimitedQueue;
    private flushQueue;
}