gitignore-synthesizer/lib/backup.js

Generate smart .gitignore files based on your project's actual contents

import fs from 'fs/promises';
import path from 'path';

export async function backupGitignore(dir) {
  const gitignorePath = path.join(dir, '.gitignore');
  try {
    const stat = await fs.stat(gitignorePath);
    if (stat.isFile()) {
      const backupName = `.gitignore.bak-${new Date().toISOString().replace(/[:.]/g, '-')}`;
      await fs.copyFile(gitignorePath, path.join(dir, backupName));
      return backupName;
    }
  } catch {
    // no .gitignore file, skip
  }
  return null;
}