/**
 * @license
 * Copyright 2023 Nuraly, Laabidi Aymen
 * SPDX-License-Identifier: MIT
 */
/**
 * Simple event bus for internal event management
 * Used by the core controller to emit events for plugins and internal communication
 */
export declare class EventBus {
    private listeners;
    /**
     * Subscribe to an event
     * @param event - Event name to subscribe to
     * @param handler - Function to call when event is emitted
     * @returns Unsubscribe function
     */
    on(event: string, handler: Function): () => void;
    /**
     * Subscribe to an event only once
     * @param event - Event name to subscribe to
     * @param handler - Function to call when event is emitted
     */
    once(event: string, handler: Function): void;
    /**
     * Unsubscribe from an event
     * @param event - Event name to unsubscribe from
     * @param handler - Handler to remove
     */
    off(event: string, handler: Function): void;
    /**
     * Emit an event
     * @param event - Event name to emit
     * @param data - Data to pass to handlers
     */
    emit(event: string, data?: any): void;
    /**
     * Remove all listeners for an event or all events
     * @param event - Optional event name. If not provided, removes all listeners
     */
    removeAllListeners(event?: string): void;
    /**
     * Get the number of listeners for an event
     * @param event - Event name
     * @returns Number of listeners
     */
    listenerCount(event: string): number;
    /**
     * Get all event names that have listeners
     * @returns Array of event names
     */
    eventNames(): string[];
}
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