code-review-checklist

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• SKILL.md

SKILL.md (first lines)

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# Code Review Checklist

---

## Quick Checklist (paste into PR comments)

```
## Review — [area]

### Security
- [ ] No user input interpolated directly into SQL, shell commands, or HTML
- [ ] Auth/authorization check present on every new endpoint
- [ ] No secrets, tokens, or passwords in code or committed config
- [ ] Sensitive data not logged or exposed in error responses

### Correctness
- [ ] All code paths return a value or throw — no silent `undefined` returns
- [ ] Edge cases handled: empty array, null/undefined, zero, empty string
- [ ] Error paths tested, not just the happy path
- [ ] No off-by-one errors in loops or pagination

### Performance
- [ ] No N+1 queries inside loops
- [ ] Payloads not unbounded (pagination or limit enforced)
- [ ] Expensive computations not re-running on every render/request
- [ ] No synchronous blocking I/O on the main thread

### Maintainability
- [ ] Names describe what the thing IS or DOES, not how it's implemented
- [ ] Functions do one thing; complex ones have a comment explaining why
- [ ] No magic numbers — named constants used instead
- [ ] Dead code removed before merging

### Tests
- [ ] New behavior has at least one test
- [ ] Tests assert outcomes, not implementation details
- [ ] Mocks reset between tests
- [ ] No `console.log` or skipped tests left behind
```

---

## Security

### SQL / Command Injection

```typescript
// ❌ TRIGGERS REVIEW — string interpolation into query
const results = await db.query(`SELECT * FROM orders WHERE user_id = ${userId}`);

// ✅ PASS — parameterized query
const results = await db.query('SELECT id, total FROM orders WHERE user_id = $1', [userId]);
```

### Missing Authorization

```typescript
// ❌ TRIGGERS REVIEW — authenticated but no ownership check
export async function DELETE(req: Request, { params }: { params: { id: string } }) {
  await db.post.delete({ where: { id: params.id } });
  return new Response(null, { status: 204 });
}

// ✅ PASS — session verified, ownership enforced
export async function DELETE(req: Request, { params }: { params: { id: string } }) {
  const session = await getServerSession();
  if (!session) return new Response('Unauthorized', { status: 401 });

  const post = await db.post.findUnique({ where: { id: params.id } });
  if (!post) return new Response('Not found', { status: 404 });
  if (post.authorId !== session.user.id) return new Response('Forbidden', { status: 403 });

  await db.post.delete({ where: { id: params.id } });
  return new Response(null, { status: 204 });
}
```

---

## Correctness

### Unhandled Edge Cases

```typescript
// ❌ TRIGGERS REVIEW — crashes if array is empty, returns wrong index if not sorted
function findCheapest(products: Product[]): Product {
  return products.sort((a, b) => a.price - b.price)[0];
}

// ✅ PASS — explicit guard, original array not mutated
function findCheapest(products: Product[]): Product | null {
  if (products.length === 0) return null;
  return [...products].sort((a, b) => a.price - b.price)[0];
}
```

### Silent `undefined` Returns

```typescript
// ❌ TRIGGERS REVIEW — if no match, returns undefined; callers rarely handle this
function getConfig(key: string) {
  const configs = loadConfigs();
  return configs.find(c => c.key === key)?.value;
}

// ✅ PASS — explicit about the missing case
function getConfig(key: string): string {
  const config = loadConfigs().find(c => c.key === key);
  if (!config) throw new Error(`Config key "${key}" not found`);
  return config.value;
}
```

---

## Performance

### N+1 in a Loop

From Nadav011/apex-skills, MIT.

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