Function circleciPrMergeCommit

build-system/common/ci.js:182–184

* Returns the merge commit for a CircleCI PR build. CIRCLECI_MERGE_COMMIT is * populated by .circleci/fetch_merge_commit.sh. * @return {string}

()

 * @return {string}
 */
function circleciPrMergeCommit() {
  return isCircleci ? env('CIRCLECI_MERGE_COMMIT') : '';
}

/**
 * Returns an identifier that is unique to each CircleCI build, discerning for