interface ScrollToOpts {
    offset?: number;
    behavior?: ScrollBehavior;
    scrollElement?: HTMLElement;
}
declare function scrollToImpl(elOrX: Element | number, optsOrY?: ScrollToOpts | number, opts?: ScrollToOpts): void;
export declare const viewport: {
    width(): number;
    height(): number;
    scrollX(): number;
    scrollY(): number;
    scrollProgress(el?: Element): number;
    pixelRatio(): number;
    isAtTop(threshold?: number): boolean;
    isAtBottom(threshold?: number): boolean;
    scrollTo: typeof scrollToImpl;
};
export {};