Function splitFrontmatter

src/workspaces/issues/declaration.ts:237–253

(raw: string)

 *  body (e.g. a markdown horizontal rule) never confuses the close fence. Returns
 *  null when there is no leading frontmatter block. */
export function splitFrontmatter(raw: string): { frontmatter: string; body: string } | null {
  const text = raw.replace(/^\uFEFF/, '')
  const lines = text.split(/\r?\n/)
  if (lines[0]?.trim() !== '---') return null
  let end = -1
  for (let i = 1; i < lines.length; i++) {
    if (lines[i].trim() === '---') {
      end = i
      break
    }
  }
  if (end === -1) return null
  return {
    frontmatter: lines.slice(1, end).join('\n'),
    body: lines.slice(end + 1).join('\n').trim(),
  }
}