/** Channels that stay global: they change rarely and invalidate every frame. */
export declare function useGlobalPreviewChannels(): {
    appOrigin: string;
    previewRevision: string;
    environmentControlRevision: number;
};
/**
 * Channels scoped to one frame. Artifact events arrive under two key spaces —
 * the recipe cache key and the frame identity — so both are subscribed; a
 * whole-store event bumps an epoch inside every version getter. cacheHydrated
 * composes the canvas-wide prehydration flag with this frame's own keys and is
 * kept fresh by the per-key snapshot subscription.
 */
export declare function useFrameKeyChannels(keys: {
    pageId: string;
    routePreviewKey: string;
    authoredRoutePreviewKey: string;
    canonicalId: string;
    fingerprint: string | null;
    /** The batched prehydration flag; defaults to false until the caller threads it. */
    batchHydrated?: boolean;
}): {
    artifactRevision: number;
    previewIntended: boolean;
    cacheHydrated: boolean;
};