export type EventCallback<TSender, TArgs> = (sender: TSender, args: TArgs) => void;
export type EventFilter<TSender, TArgs> = (sender: TSender, args: TArgs) => boolean;
export declare class KisEventTicket<TSender, TArgs> {
    private readonly handler;
    private readonly callback;
    private active;
    constructor(handler: KisEventHandler<TSender, TArgs>, callback: EventCallback<TSender, TArgs>);
    get registered(): boolean;
    unsubscribe(): void;
}
export declare class KisEventHandler<TSender, TArgs> {
    private readonly handlers;
    add(handler: EventCallback<TSender, TArgs>): KisEventTicket<TSender, TArgs>;
    on(handler: EventCallback<TSender, TArgs>, options?: {
        where?: EventFilter<TSender, TArgs>;
        once?: boolean;
    }): KisEventTicket<TSender, TArgs>;
    once(handler: EventCallback<TSender, TArgs>, where?: EventFilter<TSender, TArgs>): KisEventTicket<TSender, TArgs>;
    remove(handler: EventCallback<TSender, TArgs>): void;
    clear(): void;
    has(handler: EventCallback<TSender, TArgs>): boolean;
    invoke(sender: TSender, args: TArgs): void;
}