export declare const isServerRendering: boolean;
export declare const on: (element: any, event: string, handler: EventListener | EventListenerObject | Function, options?: boolean | AddEventListenerOptions) => void;
export declare const off: (element: any, event: string, handler: EventListener | EventListenerObject | Function, options?: boolean | AddEventListenerOptions) => void;
export declare const contains: (root: any, ele: any) => boolean;