Function parsePrNumber

scripts/utils/git.ts:167–175

(subject: string)

 * merge commit format "Merge pull request #123 from ...".
 */
export function parsePrNumber(subject: string): number | null {
  let squashMatch = subject.match(/\(#(\d+)\)\s*$/);
  if (squashMatch) return parseInt(squashMatch[1], 10);

  let mergeMatch = subject.match(/^Merge pull request #(\d+)/i);
  if (mergeMatch) return parseInt(mergeMatch[1], 10);

  return null;
}