class ContributorsResults(BaseModel):
    contributors: Counter
    commenters: Counter
    reviewers: Counter
    translation_reviewers: Counter
    authors: Dict[str, Author]


def get_contributors(pr_nodes: List[PullRequestNode]) -> ContributorsResults:
    contributors = Counter()
    commenters = Counter()
    reviewers = Counter()
    translation_reviewers = Counter()
    authors: Dict[str, Author] = {}

    protected void mergeModel_Contributors(
            Model.Builder builder, Model target, Model source, boolean sourceDominant, Map<Object, Object> context) {
        builder.contributors(target.getContributors().isEmpty() ? source.getContributors() : target.getContributors());
    }

    @Override
    protected void mergeModel_MailingLists(