export type CloseEvent = {
    code: number;
    reason: string;
    wasClean: boolean;
} | ErrorEvent;
export type ErrorEvent = {
    message: string;
};
export type MessageEvent = {
    data: any;
};
export type WebSocketEventType = 'open' | 'close' | 'error' | 'message' | 'ping' | 'pong';
export type HeaderType = {
    headers: {
        [key: string]: unknown;
    };
};
export declare class WebSocketEvent {
    type: WebSocketEventType;
    constructor(type: 'open');
    constructor(type: 'message', eventInitDict: MessageEvent);
    constructor(type: 'close', eventInitDict: CloseEvent);
    constructor(type: 'error', eventInitDict: ErrorEvent);
}