How to check count of changed files to avoid empty commits about nodegit HOT 1 OPEN

const repo = await Repository.open(repoPath);
const index = await repo.refreshIndex();

const flags: Diff.OPTION = Diff.OPTION.IGNORE_WHITESPACE; // not needed, can be 0

const head = await repo.getHeadCommit();

// In an "empty" repository the `oldTree` parameter (here `await head.getTree()`) must be `undefined`.
const stagedDiff = await Diff.treeToIndex(repo, await head.getTree(), index, { flags });
const numberOfStagedChanges = stagedDiff.numDeltas();

const unstagedDiff = await Diff.indexToWorkdir(repo, index, {
    flags: Diff.OPTION.INCLUDE_UNTRACKED | Diff.OPTION.SHOW_UNTRACKED_CONTENT | Diff.OPTION.RECURSE_UNTRACKED_DIRS | flags
});