Function getStatusesForPullRequest

ng-dev/pr/common/fetch-pull-request.ts:221–267

(
  pullRequest: PullRequestFromGithub,
)

 * for both status and checks results.
 */
export function getStatusesForPullRequest(
  pullRequest: PullRequestFromGithub,
): PullRequestStatusInfo {
  const nodes = pullRequest.commits.nodes;
  /** The combined github status and github checks object. */
  const {statusCheckRollup} = nodes[nodes.length - 1].commit;

  // If there is no status check rollup (i.e. no status nor checks), we
  // consider the pull request status as failing.
  if (!statusCheckRollup) {
    return {
      combinedStatus: PullRequestStatus.FAILING,
      statuses: [],
    };
  }

  /** A map of all of the statuses indexed by their names. */
  const statusMap = new Map<string, PullRequestStatusInfo['statuses'][number]>();

  statusCheckRollup.contexts.nodes
    .sort((a, b) => {
      const aTimestamp = Date.parse(a.completedAt || a.createdAt || '0');
      const bTimestamp = Date.parse(b.completedAt || b.createdAt || '0');
      return aTimestamp - bTimestamp;
    })
    .forEach((context) => {
      switch (context.__typename) {
        case 'CheckRun':
          statusMap.set(context.name, {
            type: 'check' as const,
            name: context.name,
            status: normalizeGithubCheckState(context.conclusion, context.status),
          });
        case 'StatusContext':
          statusMap.set(context.context!, {
            type: 'status' as const,
            name: context.context!,
            status: normalizeGithubStatusState(context.state!),
          });
      }
    });

  return {
    combinedStatus: normalizeGithubStatusState(statusCheckRollup.state),
    statuses: Array.from(statusMap.values()),
  };
}

/** Retrieve the normalized PullRequestStatus for the provided github status state. */
function normalizeGithubStatusState(state: StatusState): PullRequestStatus {