/**
 * WHICH SURFACE a heading stands on, answered by the container. `page`: the flat canvas under a `#`
 * identity band, so section titles are `##`. `panel`: a self-contained pane whose chrome title caps
 * at `lg` (a Dialog, Drawer, Popover body, a docked side panel).
 */
export type HeadingSurface = "page" | "panel";
/**
 * Published by the content regions, not `Drawer` or `Dialog`, since an overlay can frame a whole
 * page with its own `#` band. A host building its own pane provides `"panel"` directly. Flat, never
 * a depth: a popover in a drawer is still one rung down.
 */
export declare const HeadingSurfaceContext: import("react").Context<HeadingSurface>;
/** `page` unless a pane says otherwise. */
export declare function useHeadingSurface(): HeadingSurface;