export interface MessageKind<T, D> {
    type: T;
    data: D;
}
export interface CloseFrame {
    code: number;
    reason: string;
}
export declare type Message = MessageKind<'Text', string> | MessageKind<'Binary', number[]> | MessageKind<'Ping', number[]> | MessageKind<'Pong', number[]> | MessageKind<'Close', CloseFrame | null>;
export default class WebSocket {
    id: number;
    private listeners;
    constructor(id: number, listeners: Array<(arg: Message) => void>);
    static connect(url: string, options?: any): Promise<WebSocket>;
    addListener(cb: (arg: Message) => void): void;
    send(message: Message | string | number[]): Promise<void>;
    disconnect(): Promise<void>;
}