rehype-ddast

A rehype plugin that transforms hast (an HTML-equivalent syntax tree) into ddast (a syntax tree whose vocabulary is pdfmake's own layout elements).

import { unified } from "unified";
import remarkParse from "remark-parse";
import remarkRehype from "remark-rehype";
import { rehypeToDdast } from "rehype-ddast";

const ddastRoot = unified()
  .use(remarkParse)
  .use(remarkRehype)
  .use(rehypeToDdast)
  .runSync(unified().use(remarkParse).parse(markdown));

hastToDdast(root) is also available as a plain function.

Responsibilities

• Transforms markdown-derived hast elements — ul/ol/table, internal links (anchors), the <!-- pdf-page-break --> marker, and so on — into ddast's vocabulary.
• Also applies simple tagging: a straight 1:1 lookup from an HTML tag to a ddast role ("strong", "code", "heading", etc.) that needs no theme or computation belongs here.
• The ddast it produces is still "unresolved" wherever theme-dependent appearance or structure would be needed — that resolution is ddast-util-style's job.

For the full boundary of responsibilities (what does and doesn't belong here), see "rehypeDdast.ts (hast → ddast)" in ARCHITECTURE.md.