src/build/special_box.mjs


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import {visit} from 'unist-util-visit';

// This plugin is an example to let users write HTML with directives.
// It’s informative but rather useless.
// See below for others examples.
/** @type {import('unified').Plugin<[], import('mdast').Root>} */
export default function specialBox() {
  return tree => {
    visit(tree, node => {
      if (node.type === 'containerDirective' && (
        node.name === 'attention'
        || node.name === 'question'
        || node.name === 'information')) {
        const data = node.data || (node.data = {});

        data.hName = 'div';
        data.hProperties = {
          className: 'special-box ' + node.name,
        };
      }
    });
  };
}