Function loadAndValidatePullRequest

ng-dev/pr/merge/pull-request.ts:76–169

(
  {
    git,
    config,
  }: {
    git: AuthenticatedGitClient;
    config: NgDevConfig<{
      pullRequest: PullRequestConfig;
      github: GithubConfig;
    }>;
  },
  prNumber: number,
  validationConfig: PullRequestValidationConfig,
)

 *   is selected.
 */
export async function loadAndValidatePullRequest(
  {
    git,
    config,
  }: {
    git: AuthenticatedGitClient;
    config: NgDevConfig<{
      pullRequest: PullRequestConfig;
      github: GithubConfig;
    }>;
  },
  prNumber: number,
  validationConfig: PullRequestValidationConfig,
): Promise<PullRequest> {
  const prData = await fetchPullRequestFromGithub(git, prNumber);

  if (prData === null) {
    throw new FatalMergeToolError('Pull request could not be found.');
  }

  const labels = prData.labels.nodes.map((l) => l.name);
  const githubTargetBranch = prData.baseRefName;

  const {mainBranchName, name, owner} = config.github;

  // Active release trains fetched. May be `null` if e.g. target labeling is disabled
  // and the active release train information is not available/computable.
  let activeReleaseTrains: ActiveReleaseTrains | null = null;
  let target: PullRequestTarget | null = null;

  if (config.pullRequest.__noTargetLabeling) {
    // If there is no target labeling, we always target the main branch and treat the PR as
    // if it has been labeled with the `target: major` label (allowing for all types of changes).
    target = {branches: [config.github.mainBranchName], label: targetLabels['TARGET_MAJOR']};
  } else {
    activeReleaseTrains = await ActiveReleaseTrains.fetch({
      name,
      nextBranchName: mainBranchName,
      owner,
      api: git.github,
    });

    target = await getTargetBranchesAndLabelForPullRequest(
      activeReleaseTrains,
      git.github,
      config,
      labels,
      githubTargetBranch,
    );
  }

  const validationFailures = await assertValidPullRequest(
    prData,
    validationConfig,
    config,
    activeReleaseTrains,
    target,
    git,