function code(h, node) {
  const value = node.value ? detab(node.value) : '';
  const raw = ['', `\`\`\`${node.lang}`, value, '```'].join('\n');
  return h.augment(node, u('raw', raw));
}
Keep the code blocks as md source code so storybook will use it's special code block

@param {*} h
@param {*} node