/**
 * Crepe mounts `.milkdown-slash-menu` as a sibling of `.ProseMirror`. Scroll
 * ancestors clip `position: absolute`. Move the node to a `.milkdown` shell on
 * `document.body` so nested Crepe CSS still applies, and pin the shell to the
 * editor milkdown box so SlashProvider top/left stay valid.
 *
 * Do not copy `--crepe-*` as inline styles. That freezes the first resolved
 * theme and beats nord.css / nord-dark.css on `.milkdown`.
 */
export declare function useSlashMenuPortal(container: HTMLElement | null): void;