import type { StorageEventType, StorageEventData, EventListener } from '../types';
/**
 * Simple event emitter for storage events
 */
export declare class EventEmitter {
    private listeners;
    private onceListeners;
    /**
     * Register an event listener
     */
    on(event: StorageEventType, listener: EventListener): void;
    /**
     * Register a one-time event listener
     */
    once(event: StorageEventType, listener: EventListener): void;
    /**
     * Remove an event listener
     */
    off(event: StorageEventType, listener: EventListener): void;
    /**
     * Remove all listeners for an event
     */
    removeAllListeners(event?: StorageEventType): void;
    /**
     * Emit an event
     */
    emit(event: StorageEventType, data: Omit<StorageEventData, 'type' | 'timestamp'>): void;
    /**
     * Get listener count for an event
     */
    listenerCount(event: StorageEventType): number;
    /**
     * Get all event types with listeners
     */
    eventNames(): StorageEventType[];
}