export interface PanelRegistry {
    readonly panels: ReadonlySet<string>;
    register(value: string): () => void;
}
export declare function createPanelRegistry(): PanelRegistry;
export declare const PanelRegistryContext: import("react").Context<PanelRegistry | null>;
/** REQ-SURF-51: true inside a Tabs.Root. A TabBar(semantics='tabs') outside
    one supplies its own Base UI Tabs root so its tabs still rove/select. */
export declare const TabsRootPresenceContext: import("react").Context<boolean>;
/** The enclosing registry, or a stable one owned by the caller. */
export declare function useOwnOrOuterPanelRegistry(): PanelRegistry;
/** Register a Tabs.Panel value so TabBar semantics='tabs' can validate it
    (layout effect: registered before the bar's post-commit check). */
export declare function useTabBarPanel(value: string): void;
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