export declare const isServerRendering: boolean;
export declare const on: <K extends keyof HTMLElementEventMap>(element: HTMLElement | Window, event: K, handler: (ev: HTMLElementEventMap[K]) => void, options?: boolean | AddEventListenerOptions) => void;
export declare const off: <K extends keyof HTMLElementEventMap>(element: HTMLElement | Window, type: K, handler: (ev: HTMLElementEventMap[K]) => void, options?: boolean | EventListenerOptions) => void;