type SectionBox = {
    index: number;
    elements: HTMLElement[];
};
/** How far each section shifts once `from` moves to `to`, keeping the original gaps between slots. */
export declare function getMovedSectionOffsets({ sections, from, to, }: {
    sections: readonly {
        index: number;
        top: number;
        bottom: number;
    }[];
    from: number;
    to: number;
}): Map<number, number>;
export type ViewportBox = {
    top: number;
    bottom: number;
    left: number;
    right: number;
};
/** A section's on-screen box: the union of its connected elements, or null when it renders nothing visible. */
export declare function getSectionViewportBox(elements: readonly HTMLElement[] | undefined): ViewportBox | null;
/**
 * Shows a dropped section in its new place before the source change reaches the preview, by
 * shifting sections with transforms instead of moving DOM nodes: React keeps positional children,
 * so nodes moved behind its back would get the wrong content when the refresh commits. The shift
 * clears itself the moment the preview's own DOM reflects the move (checked before paint), so the
 * page never shows the old order in between.
 */
export declare function startOptimisticSectionMove({ sections, from, to, onLanded, }: {
    sections: readonly SectionBox[];
    from: number;
    to: number;
    onLanded: () => void;
}): {
    revert: () => void;
    settle: () => void;
};
export {};