export declare class BaseEventTarget extends EventTarget {
    #private;
    constructor({ onListenerCountChange, }: {
        onListenerCountChange: OnListenerCountChange;
    });
    addEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: AddEventListenerOptions | boolean): void;
    removeEventListener(type: string, listener: EventListenerOrEventListenerObject | null, options?: EventListenerOptions | boolean): void;
}
type OnListenerCountChange = (type: string, count: number) => void;
export {};