/**
 * Interface for events that can be emitted
 * This interface can be extended to create specific event types
 * with additional properties as needed.
 * @see /docs/event-emitter.md
 */
export interface Event {
    type: string;
}
/**
 * Interface for observer objects that want to be notified of specific events
 */
export interface EventObserver<T extends Event> {
    update(event: T): void;
}
/**
 * EventEmitter that maintains a list of observers and notifies them of events
 */
export declare class EventEmitter<T extends Event> {
    private observers;
    /**
     * Subscribe to events of a specific type
     */
    subscribe(eventType: string, observer: EventObserver<T>): void;
    /**
     * Unsubscribe from events of a specific type
     */
    unsubscribe(eventType: string, observer: EventObserver<T>): void;
    /**
     * Emit an event to all subscribed observers
     */
    emit(event: T): void;
    /**
     * Check if there are any subscribers for a specific event type
     */
    hasObservers(eventType: string): boolean;
}