declare class Notifier {
    private _handlers?;
    /**
     * Trigger event
     * @param  {string} name
     */
    trigger(name: string, ..._args: any[]): void;
    /**
     * Register event handler
     */
    on(name: string, action: Function, context?: any): this;
    /**
     * Register event, event will only be triggered once and then removed
     * @param  {string} name
     * @param  {Function} action
     * @param  {Object} [context]
     * @chainable
     */
    once(name: string, action: Function, context?: any): this;
    /**
     * Alias of once('before' + name)
     * @param  {string} name
     * @param  {Function} action
     * @param  {Object} [context]
     * @chainable
     */
    before(name: string, action: Function, context?: any): this;
    /**
     * Alias of once('after' + name)
     * @param  {string} name
     * @param  {Function} action
     * @param  {Object} [context]
     * @chainable
     */
    after(name: string, action: Function, context?: any): this;
    /**
     * Alias of once('success')
     * @param  {Function} action
     * @param  {Object} [context]
     * @chainable
     */
    onload(action: Function, context?: any): this;
    /**
     * Alias of once('error')
     * @param  {Function} action
     * @param  {Object} [context]
     * @chainable
     */
    onerror(action: Function, context?: any): this;
    /**
     * Remove event listener
     * @param  {Function} action
     * @param  {Object} [context]
     * @chainable
     */
    off(name: string, action?: Function): this | undefined;
    /**
     * If registered the event handler
     * @param  {string}  name
     * @param  {Function}  action
     * @return {boolean}
     */
    has(name: string, action: Function): boolean | undefined;
}
export default Notifier;