text: const visit = require('unist-util-visit');
  const hljs = require('highlight.js');
  
  /**
   * Adapted from remark-highlight.js
   * https://github.com/ben-eb/remark-highlight.js
   * @param {Object} node AST node
   * @returns {undefined} modifies the node by reference
   * @private
   */
  function visitor(node) {
    if (node.lang) {
      node.type = 'html';
      node.value =
        "<pre class='hljs'>" +
        hljs.highlightAuto(node.value, [node.lang]).value +
        '</pre>';
    }
  }
  
  module.exports = function(ast) {
    visit(ast, 'code', visitor);
    return ast;
  };
  