Function parsePrNumber

ng-dev/pr/merge/merge-pull-request.ts:153–162

(prUrlOrNumber: string)

 * Parses the pull request number from either the number or url string
 */
export function parsePrNumber(prUrlOrNumber: string): number {
  // There is no url validation here other than presence of `/`.
  // So whatever is the last segment of that string, url or not, will be
  // parsed as a PR number.
  const prNumber = parseInt(prUrlOrNumber.split('/').pop()!);
  if (isNaN(prNumber)) {
    throw new Error('Pull Request was unable to be parsed from the parameters');
  }
  return prNumber;
}