interface IEvent {
    cb: (...args: any[]) => any;
    ctx: any;
}
interface IEventMap {
    [event: string]: IEvent;
}
/**
 * Event Handler
 * @desc
 * - only enabled event can be emitted
 * - If the callback of an event is not set, alert will be called by default on the browser, and Error will be triggered in nodejs
 * @author kinghand@foxmail.com
 */
export default class EventHandler {
    protected _defaultCb: (...args: any[]) => any;
    protected _eventMap: IEventMap;
    protected _supportedEvents: string[];
    constructor(supportedEvents?: string[] | IEventMap);
    /**
     * enable event names
     * @param {Array | Object} supportedEvents - keys will be used when it's an object
     */
    enableEvents(supportedEvents: any): void;
    /**
     * set callback of an event name
     * @param {string} event - event name
     * @param {Function} fnCallback - if there is already a callback, then the new one will cover the previous one.
     * @param {*} instance - the instance of the callback.
     * @return {EventHandler} - for pipeline
     */
    setEvent(event: string, fnCallback: (...args: any[]) => any, instance: any): this;
    /**
     * trigger an event by name
     * @param {string} event - event name
     * @param {Array} args - arguments
     */
    emitEvent(event: string, ...args: any[]): any;
}
export {};