/** Primary hub scrollport — set on `PrimaryPageTemplate` body wrapper in apps/web. */
declare const PAGE_SCROLL_ATTR = "data-page-scroll";
/** Breadcrumb / site chrome — bottom edge is the table sticky-header pin line. */
declare const SITE_HEADER_ATTR = "data-site-header";
/**
 * The element that vertically scrolls hub page content (not `window`).
 * Falls back to `#main-content` for legacy shells.
 */
declare function getPageScrollElement(): HTMLElement | null;
/**
 * Viewport Y where floating table column headers should pin — bottom of
 * `SiteHeader` when present, else `--header-height` (48px).
 */
declare function getStickyTableHeaderOffset(): number;
/** Subscribe to vertical scroll sources that move tables relative to the viewport. */
declare function bindVerticalScrollListeners(onScroll: () => void): () => void;

export { PAGE_SCROLL_ATTR, SITE_HEADER_ATTR, bindVerticalScrollListeners, getPageScrollElement, getStickyTableHeaderOffset };