import type { Plugin } from 'unified';
import type { GenericParent } from 'myst-common';
import type { VFile } from 'vfile';
/**
 * Update container children and add sub-figures
 *
 * - Valid container nodes are ensured to be first children.
 *   These include image/iframe/table/code/embed/block/container/anywidget nodes.
 * - If multiple of these are present, they are nested as sub-figures.
 *   (This does not include placeholder images, which are left unchanged)
 * - A warning is raised if these node types are found in caption or legend
 * - Remaining non-image content becomes caption (first node) and legend (subsequent nodes).
 */
export declare function containerChildrenTransform(tree: GenericParent, vfile: VFile): void;
export declare const containerChildrenPlugin: Plugin<[], GenericParent, GenericParent>;
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