/** Creates an event emitter. */
declare function _default(): EventEmitter;
export default _default;
export type EventEmitter = {
    /**
     * Emits an event.
     * @param {string} event_name The event name.
     * @param {...any} args The event arguments.
     */
    emit: (event_name: string, ...args: any[]) => void;
    /**
     * Registers an event listener.
     * @param {string} event_name The event name.
     * @param {Function} listener The event listener.
     * @returns {Function} A function that unregisters the event listener.
     */
    on: (event_name: string, listener: (...args: any[]) => void) => () => void;
    /**
     * Registers an event listener that will be called only once.
     * @param {string} event_name The event name.
     * @param {Function} listener The event listener.
     * @returns {Function} A function that unregisters the event listener.
     */
    once: (event_name: string, listener: (...args: any[]) => void) => () => void;
};