import { type ReactNode } from "react";
/** True when the current block renders inside a constrained tab/column cell. */
export declare function useInNarrowContainer(): boolean;
/**
 * Marks its subtree as living inside a width-constrained container. Wrap the
 * children a vertical `tabs` or `columns` block renders so nested
 * width-sensitive blocks can pick a container-appropriate default. Idempotent:
 * nesting the provider keeps the flag `true`.
 */
export declare function NarrowContainerProvider({ children }: {
    children: ReactNode;
}): import("react").JSX.Element;
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