type EventHandler<T = any> = (data: T) => void;
/**
 * A simple event emitter implementation that provides type-safe event handling.
 * Supports subscribing to events, unsubscribing, and emitting events with payloads.
 * Events are handled synchronously and any errors in handlers are caught and logged.
 */
export declare class EventEmitter {
    /** Map of event names to their set of handlers */
    private handlers;
    /**
     * Subscribes to an event.
     * @param event - The name of the event to listen for
     * @param handler - The callback function to execute when the event occurs
     * @returns A function that can be called to unsubscribe from the event
     *
     * @example
     * ```typescript
     * const unsubscribe = emitter.on('userUpdate', (data: UserData) => {
     *   console.log('User updated:', data);
     * });
     *
     * // Later, to stop listening:
     * unsubscribe();
     * ```
     */
    on<T>(event: string, handler: EventHandler<T>): () => void;
    /**
     * Unsubscribes a handler from an event.
     * If this was the last handler for the event, the event is removed from the handlers map.
     * @param event - The name of the event to unsubscribe from
     * @param handler - The handler function to remove
     */
    off<T>(event: string, handler: EventHandler<T>): void;
    /**
     * Emits an event with the provided data. In addition to calling handlers for the specific event,
     * it also calls any wildcard ('*') handlers. Wildcard handlers receive an object with { event, payload }.
     */
    emit<T>(event: string, data: T): void;
    /**
     * Removes all event handlers.
     * After calling this method, no events will be handled until new handlers are registered.
     */
    clear(): void;
    /**
     * Checks if an event has any active listeners.
     * @param event - The name of the event to check
     * @returns True if the event has at least one handler, false otherwise
     */
    hasListeners(event: string): boolean;
}
export {};
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