Would you ship this settings merger?

Situation

An AI agent generated a deepMerge helper to merge user preferences with defaults.

Environment

Express API handling PATCH requests for user settings.

Select suspicious lines in the terminal to flag them before submitting your verdict.

pending review

function deepMerge(target, source) {
  for (const key in source) {
    if (source[key] && typeof source[key] === 'object') {
      if (!target[key]) target[key] = {};
      deepMerge(target[key], source[key]);
    } else {
      target[key] = source[key];
    }
  }
  return target;
}

app.patch('/api/user/preferences', (req, res) => {
  const defaults = { theme: 'light', notifications: true };
  const merged = deepMerge(defaults, req.body);
  savePreferences(req.user.id, merged);
  res.json({ preferences: merged });
});