import * as React from 'react';
import type { PortalLayerRoot } from '../contracts/preferences.js';
export interface PortalRootState {
    /** The element that owns the layer roots (the portal root itself). */
    root: HTMLElement | null;
}
export declare const PortalRootContext: React.Context<PortalRootState | null>;
export declare const queryLayerRoot: (host: HTMLElement | Document | null, name: PortalLayerRoot) => HTMLElement | null;
export declare const findPortalRoot: (doc: Document | null) => HTMLElement | null;
/** S-23 (REQ-FIN-07): the single usePortalContainer implementation
   (`src/foundation/portal.ts` re-exports it). Returns the provider's
   `[data-ag-layer-root=<root>]`, resolved during render once the provider has
   published its portal root, or `null` when no provider is mounted (and on
   the server). Consumers decide what `null` means for their portal. */
export declare function usePortalContainer(root?: PortalLayerRoot): HTMLElement | null;
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