/**
 * Minimal Buttplug v4 WebSocket transport
 */
type MessageHandler = (type: string, payload: any) => void;
export declare class ButtplugWs {
    private ws;
    private msgId;
    private pending;
    private pingTimer;
    private onMessage;
    constructor(onMessage: MessageHandler);
    get connected(): boolean;
    open(url: string, clientName: string): Promise<void>;
    send(type: string, payload: Record<string, unknown>): Promise<Record<string, unknown>>;
    close(): void;
    private handleRaw;
    private cleanup;
}
export {};