Review TypeScript code for quality, security, and correctness. Use this skill when the user asks for a code review, wants feedback on a PR or diff, or says "review this". Covers architecture, security, error handling, database patterns, type safety, and code quality. Produces categorized findings: critical issues, improvements, suggestions, and positive notes. Also triggers on phrases like "check this code", "what do you think of this", or "any issues with".
Installation
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Review TypeScript code for quality, security, and correctness. Use this skill when the user asks for a code review, wants feedback on a PR or diff, or says "review this". Covers architecture, security, error handling, database patterns, type safety, and code quality. Produces categorized findings: critical issues, improvements, suggestions, and positive notes. Also triggers on phrases like "check this code", "what do you think of this", or "any issues with".
Code Review
Review: $ARGUMENTS
Review Checklist
1. Architecture & Patterns
Clear separation of concerns (routing, business logic, data access)
Dependency injection or explicit dependencies (no hidden globals)
Service/module layer handles business logic, not handlers/controllers
Input validation at the boundary (DTOs, schemas, zod, class-validator)
2. Security
Auth checks on sensitive endpoints
Role-based or scope-based access control where needed
No hardcoded secrets, credentials, or API keys
Input validation and sanitization on all public inputs
Parameterized queries (no string interpolation in SQL)
Webhook signature verification
No sensitive data in logs or error responses
3. Error Handling
Errors are properly typed and propagated
Error messages don't leak internals to clients
External service calls wrapped in try-catch
Graceful degradation where appropriate
No swallowed errors (empty catch blocks)
4. Database
Transactions for multi-step operations
Proper indexing for query patterns
No N+1 queries
Connection handling (pools, timeouts, cleanup)
5. TypeScript-Specific
No any without justification
Proper type annotations on public APIs
Discriminated unions over optional sprawl
Null/undefined handled explicitly (no implicit ! abuse)
Generics used where they add value, not everywhere
6. Code Quality
Single responsibility per function/class
No duplicated logic that should be shared
Descriptive names (no data, info, result as sole identifiers)
