/**
 * True while this page is visible and its window has focus. A page left open
 * in a background tab, behind another window, or (in an iframe) while focus is
 * elsewhere is not in the foreground.
 */
export declare function useDocumentForeground(): boolean;
/**
 * True while the resolved element is rendered and intersects the viewport. An
 * element that a host hides (`display: none`, a collapsed panel, a closed
 * drawer moved off screen) or that is not rendered at all is not on screen.
 * `resolve` runs again whenever `refreshKey` changes (for example when the
 * element may have been replaced).
 */
export declare function useElementOnScreen(resolve: () => Element | null, refreshKey: unknown): boolean;