Property 'mdRef' is missing in type '{ doc: { html: string; headings: { headingLevel: string; html: string | null; slug: string | undefined; }[]; children: ({ attrs: { [x: string]: any; title: string; order?: number | undefined; new?: boolean | undefined; }; ... 4 more ...; slugs?: undefined; } | { ...; })[]; filename: string; attrs: { ...; }; slug?: s...' but required in type '{ doc: Doc; mdRef: RefObject<HTMLDivElement>; }'.