/**
 * Simple event bus for cross-component communication
 * From AIU implementation - enables decoupled component communication
 */
type EventCallback = (data: any) => void;
declare class EventBus {
    private listeners;
    /**
     * Subscribe to an event
     */
    on(event: string, callback: EventCallback): void;
    /**
     * Unsubscribe from an event
     */
    off(event: string, callback: EventCallback): void;
    /**
     * Emit an event to all subscribers
     */
    emit(event: string, data?: any): void;
    /**
     * Remove all listeners for an event, or all events if no event specified
     */
    clear(event?: string): void;
}
export declare const eventBus: EventBus;
export {};
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