export default class EventEmitter {
    private observers;
    constructor();
    /**
     * Pushes an event to the passed in listener.
     * @param {Object} event The event that was fired.
     * @param {Object} listener The listener that the fired event will be pushed to.
     * @function
     * @public
     * @returns {void} Method does not return a value.
     */
    on(event: string, listener: any): void;
    /**
     * Removes an event from a passed in listener.
     * @param {Object} event Event to be removed from the listener.
     * @param {Object} listener The listener the event will be removed from.
     * @function
     * @public
     * @returns {void} Method does not return a value.
     */
    off(event: string, listener: any): void;
    /**
     * Emits the passed in event to all observers.
     * @param {Object} event The event to be broadcasted to all available observers.
     * @param {Object} args A variable number of objects passed in to attatch.
     * @function
     * @public
     * @returns {void} Returns if there is no current observers for the passed in event.
     */
    protected emit(event: any, ...args: Array<any>): void;
    /**
     * Returns the true number of current observers.
     * @returns {int} The current number of observers.
     * @function
     * @public
     */
    protected numberOfObservers(): number;
}
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