interface EventMap {
    connect: () => void;
    disconnect: () => void;
    message: (data: unknown) => void;
    loadHistory: (data: unknown) => void;
    sessionConfirm: () => void;
}
type EventCallback<T extends keyof EventMap> = EventMap[T];
export declare class EventEmitter {
    private events;
    on<K extends keyof EventMap>(eventName: K, callback: EventCallback<K>): void;
    protected trigger<K extends keyof EventMap>(eventName: K, ...args: Parameters<EventCallback<K>>): void;
}
export {};