export type WebSocketLike = {
    readyState: number;
    send(data: string, callback?: (error?: Error) => void): void;
    close(code?: number, reason?: string): void;
    terminate?: () => void;
    ping?: () => void;
    on?(event: string, listener: (...args: any[]) => void): unknown;
    off?(event: string, listener: (...args: any[]) => void): unknown;
    addEventListener?(event: string, listener: (...args: any[]) => void): unknown;
    removeEventListener?(event: string, listener: (...args: any[]) => void): unknown;
};
export type WebSocketConstructor = new (url: string, options: {
    headers: Record<string, string>;
    perMessageDeflate?: boolean;
    finishRequest?: (request: {
        on?: (event: string, listener: (...args: unknown[]) => void) => unknown;
        end?: () => void;
    }) => void;
}) => WebSocketLike;
export declare function loadDefaultWebSocketConstructor(): WebSocketConstructor;
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