/**
 * Full-height page mode: a page declares "I fill the viewport" and the shell
 * gives its wrapper a viewport-height flex chain instead of the default
 * content-sized, scrolling `.tai-page`.
 *
 * The signal travels page → shell through context, NOT a route handle: plugin
 * pages all share ONE catch-all route, so a per-route handle cannot vary between
 * them. A rendered page (feature route or plugin page alike) opts in with
 * {@link useFillViewport}; the shell reads {@link usePageFillActive} to add the
 * `.tai-page--fill` / `.tai-shell-main--fill` modifiers. Opt-in is ref-counted so
 * the modifier survives a route transition (old page unmounts after the new one
 * mounts) and clears exactly when the last fill page leaves.
 */
import { type ReactNode } from 'react';
/**
 * Wraps the shell's routed region: holds the count of pages asking for fill mode
 * and publishes both the registrar (for {@link useFillViewport}) and the active
 * flag (for {@link usePageFillActive}). Renders no DOM of its own.
 */
export declare function PageFillProvider({ children }: {
    children: ReactNode;
}): ReactNode;
/**
 * Opt the current page into full-height fill mode for as long as it is mounted.
 * The shell fills `<main>` to the viewport and lets the page's own root flex or
 * `height: 100%` down the chain. Must be called under a {@link PageFillProvider}
 * (the shell mounts one); outside it there is no wrapper to modify, so it throws
 * rather than silently do nothing.
 */
export declare function useFillViewport(): void;
/** Whether any mounted page currently asks for fill mode — the shell's cue to add
 * the fill modifiers to `<main>` and the page wrapper. */
export declare function usePageFillActive(): boolean;
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