Function decodePart

apps/sim/tools/gmail/utils.test.ts:23–30

* Extract and base64-decode the body of a specific MIME part identified by its * Content-Type prefix (e.g. `text/plain`, `text/html`). Returns the decoded * UTF-8 string.

(mime: string, contentTypePrefix: string)

 * UTF-8 string.
 */
function decodePart(mime: string, contentTypePrefix: string): string {
  const partRegex = new RegExp(
    `Content-Type: ${contentTypePrefix}[^\\n]*\\nContent-Transfer-Encoding: base64\\n\\n([\\s\\S]*?)\\n\\n--`
  )
  const match = mime.match(partRegex)
  if (!match) throw new Error(`No ${contentTypePrefix} part found`)
  return Buffer.from(match[1].replace(/\n/g, ''), 'base64').toString('utf-8')
}

describe('encodeRfc2047', () => {
  it('returns ASCII text unchanged', () => {