Function htmlToMarkdownBasic

packages/shared/src/lib/markdownConversion.ts:279–337

(html: string)

 * // Returns: '**bold** and _italic_'
 */
export const htmlToMarkdownBasic = (html: string): string => {
  if (!html) {
    return '';
  }

  const parser = new DOMParser();
  const doc = parser.parseFromString(html, 'text/html');

  const blocks = Array.from(doc.body.childNodes)
    .map((node) => {
      if (node.nodeType === Node.TEXT_NODE) {
        const normalized = normalizeText(node.textContent || '').trim();
        return normalized || null;
      }

      if (!(node instanceof Element)) {
        return null;
      }

      const tagName = node.tagName.toLowerCase();

      switch (tagName) {
        case 'p': {
          const content = serializeChildren(node).trim();
          return content;
        }
        case 'pre': {
          const code = node.textContent ?? '';
          return `\`\`\`\n${normalizeText(code).trim()}\n\`\`\``;
        }
        case 'h1':
          return `# ${serializeChildren(node).trim()}`;
        case 'h2':
          return `## ${serializeChildren(node).trim()}`;
        case 'h3':
          return `### ${serializeChildren(node).trim()}`;
        case 'h4':
          return `#### ${serializeChildren(node).trim()}`;
        case 'h5':
          return `##### ${serializeChildren(node).trim()}`;
        case 'h6':
          return `###### ${serializeChildren(node).trim()}`;
        case 'ul':
          return serializeList(node, false);
        case 'ol':
          return serializeList(node, true);
        case 'img':
          return serializeInline(node).trim();
        default:
          return serializeChildren(node).trim();
      }
    })
    .filter((block): block is string => block !== null);

  return blocks
    .join('\n\n')
    .replace(/\n{4,}/g, '\n\n\n')
    .trim();