skolplattformen-backup/lib/parseHtml.ts

import * as h2m from 'h2m'
import { htmlDecode } from 'js-htmlencode'

export const trim = (html: string = ''): string => html
  .replace(/ /g, ' ')
  .split('>')
  .map((token) => token.trim())
  .join('>')
  .split('</')
  .map((token) => token.trim())
  .join('</')

interface Node {
  name: string
  attrs: { [key: string]: string }
  isInPreNode: boolean
  md: string
}
const converter = 'MarkdownExtra'
const overides = {
  a: (node: Node) => `[${node.md}](${node.attrs.href})`,
}

export const toMarkdown = (html: string): string => {
  const trimmed = trim(html)
  const markdown = h2m(trimmed, { overides, converter })
  const decoded = htmlDecode(markdown)
  return decoded
}