import { WacapEventType, WacapEventData, EventHandler } from '../types';
/**
 * Global EventBus for broadcasting events across all sessions.
 * Allows consumers to subscribe once to e.g. QR codes from any session.
 */
export declare class EventBus {
    private emitter;
    on(event: WacapEventType, handler: EventHandler): void;
    once(event: WacapEventType, handler: EventHandler): void;
    off(event: WacapEventType, handler: EventHandler): void;
    emit(event: WacapEventType, data: WacapEventData): void;
    removeAll(event?: WacapEventType): void;
}
//# sourceMappingURL=event-bus.d.ts.map