/**
 *  Add `code` and `highlightedCode` props to <Preview> from slot contents
 */
export function codePreview(): {
    /**
     * @param {Object} options
     * @param {string} options.content
     * @param {string} options.filename
     */
    markup({ content, filename }: {
        content: string;
        filename: string;
    }): Promise<{
        code: string;
    }>;
};