// filesToCommit is the array of file paths, relative to the repo root
  if (filesToCommit.length) {
    const index = await repo.refreshIndex();
    const indexPromises = filesToCommit.map(async (relativeFilePath) => {
      await index.addByPath(relativeFilePath);
    });
    await Promise.all(indexPromises);
    index.write();
    const oid = await index.writeTree();
    const signature = Signature.default(repo);
    const head = await Reference.nameToId(repo, "HEAD");
    const parent = await repo.getCommit(head);
    await repo.createCommit(
      "HEAD",
      signature,
      signature,
      "Format and lint files.",
      oid,
      [parent]
    );
    // This never runs:
    console.log(`Committed fixes to ${filesToCommit.length} file(s).`);
  }