/**
 * Simple event system for device communication
 */
type EventCallback = (data: any) => void;
export declare class EventEmitter {
    private events;
    /**
     * Register an event listener
     * @param event Event name
     * @param callback Function to call when event is emitted
     * @returns Unsubscribe function
     */
    on(event: string, callback: EventCallback): () => void;
    /**
     * Remove an event listener
     * @param event Event name
     * @param callback Function to remove
     */
    off(event: string, callback: EventCallback): void;
    /**
     * Emit an event with data
     * @param event Event name
     * @param data Data to pass to listeners
     */
    emit(event: string, data?: any): void;
    /**
     * Remove all event listeners
     * @param event Optional event name. If not provided, all events are cleared.
     */
    removeAllListeners(event?: string): void;
}
export {};