interface Options {
    maxAttempts?: number;
    protocols?: string[];
    onmessage?: (event: any) => void;
    onopen?: (event: any) => void;
    onclose?: (event: any) => void;
    onerror?: (event: any) => void;
    onreconnect?: (event: any) => void;
    onmaximum?: (event: any) => void;
    timeoutMillis?: number;
}
export interface WebSocketWrapper {
    open: () => void;
    reconnect: (e: any) => void;
    json: (x: any) => void;
    send: (x: string) => void;
    close: (x?: number, y?: string) => void;
    connected: boolean;
    /**
     * Websocket is explicitly closed by calling socket.close().
     * Used to ignore errors after socket.closed() is called.
     */
    closeCalled: boolean;
}
export declare function createWebSocketWrapper(url: string, opts?: Options): WebSocketWrapper;
export {};