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 === "note" ||
          node.name === "information")
      ) {
        const data = node.data || (node.data = {});

        data.hName = "div";
        data.hProperties = {
          className: "special-box " + node.name,
        };
      }
      if (node.type === "containerDirective" && node.name === "details") {
        if (node.children.length > 0 && node.children[0].type == "paragraph") {
          node.children[0] = {
            type: "containerDirective",
            data: {
              hName: "summary",
            },
            children: node.children[0].children,
          };

          const data = node.data || (node.data = {});
          data.hName = "details";
        }
      }
    });
  };
}