import { BaseListener, BaseObserver, BaseObserverInterface } from './BaseObserver.js';
/**
 * Represents the counts of listeners for each event type in a BaseListener.
 */
export type ListenerCounts<Listener extends BaseListener> = Partial<Record<keyof Listener, number>> & {
    total: number;
};
/**
 * Meta listener which reports the counts of listeners for each event type.
 */
export interface MetaListener<ParentListener extends BaseListener> extends BaseListener {
    listenersChanged?: (counts: ListenerCounts<ParentListener>) => void;
}
export interface ListenerMetaManager<Listener extends BaseListener> extends BaseObserverInterface<MetaListener<Listener>> {
    counts: ListenerCounts<Listener>;
}
export interface MetaBaseObserverInterface<Listener extends BaseListener> extends BaseObserverInterface<Listener> {
    listenerMeta: ListenerMetaManager<Listener>;
}
/**
 * A BaseObserver that tracks the counts of listeners for each event type.
 */
export declare class MetaBaseObserver<Listener extends BaseListener> extends BaseObserver<Listener> implements MetaBaseObserverInterface<Listener> {
    protected get listenerCounts(): ListenerCounts<Listener>;
    get listenerMeta(): ListenerMetaManager<Listener>;
    protected metaListener: BaseObserver<MetaListener<Listener>>;
    constructor();
    registerListener(listener: Partial<Listener>): () => void;
}