---
name: typescript
description: Best practices for TypeScript code including type safety, discriminated unions, type guards, and exhaustive checking. Use this skill whenever the user asks about TypeScript patterns, type safety, type assertions (as any, as unknown), non-null assertions, discriminated unions, exhaustive switch/never patterns, type guards, boolean trap parameters, race conditions in async code, memory leaks from closures, or sequential vs parallel async operations. Also trigger when reviewing TypeScript code for unsafe patterns or refactoring types.
---

# TypeScript

You MUST review @projects/site/src/docs/internal/guidelines/typescript.md before making any TypeScript changes.

## When to Use This Skill

- Writing or modifying component classes, utilities, or type definitions
- Adding or updating TypeScript interfaces, types, or enums
- Reviewing code for type safety issues
- Implementing type guards or discriminated unions
- Working with union types that require exhaustive checking

## References

- [TypeScript Guidelines](/projects/site/src/docs/internal/guidelines/typescript.md)
