type EventListener = (data: any) => void;
type Deletable = {
    delete(): void;
};
export declare class EventSystem {
    events: Record<string, EventListener[]>;
    constructor();
    dispatchEvent(event_name: string, data: any): any;
    on(event_name: string, cb: EventListener): Deletable;
    once(event_name: string, cb: EventListener): Deletable;
    addListener(event_name: string, cb: EventListener): Deletable;
    removeListener(event_name: string, cb: EventListener): void;
    /**
     * Check if event has listeners
     */
    hasListeners(event_name: string): boolean;
    /**
     * Get listener count for an event
     */
    getListenerCount(event_name: string): number;
    /**
     * Remove all listeners for an event
     */
    removeAllListeners(event_name?: string): void;
    /**
     * Get all event names that have listeners
     */
    getEventNames(): string[];
}
export {};
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