/** Minimal WS surface used by the endpoint (real `ws` or test mock). */
export interface NapCatWsSocket {
    readonly readyState: number;
    send(data: string): void;
    close(code?: number, reason?: string): void;
    ping?(): void;
    on(event: 'open' | 'message' | 'close' | 'error', listener: (...args: unknown[]) => void): void;
}
export interface NapCatWsCreateOptions {
    readonly headers?: Record<string, string>;
}
export declare const WS_OPEN = 1;
export interface NapCatPendingAction {
    resolve: (value: unknown) => void;
    reject: (err: Error) => void;
    timeout: NodeJS.Timeout;
}