This Package was deprecated. Unified is the better option. And you can use rehype-prism to highlight code in markdown.
npm install md-core
md-core is just a core, need plugins to parse markdown
see more: md-plugins-vig, md-highlight.
// costom your md
// md.js
import md from 'md-core';
import { vigMdPlugins } from 'md-plugins-vig';
import highlightMdPlugins from 'md-plugins-highlight';
export default md()
.use(vigMdPlugins())
.use(highlightMdPlugins())
Then import your costom md
import md from './md.js'
md.parse('# header').toHTML();
// -> <h1>header</h1>