TypeScript Patterns

Production-grade TypeScript patterns for type-safe, maintainable applications.

When to Activate

• Writing TypeScript code in any framework (Node.js, React, Next.js)
• Designing type-safe APIs and domain models
• Handling errors without exceptions
• Structuring TypeScript modules and configurations
• Replacing runtime any types or unsafe as casts with properly narrowed types
• Modeling complex state machines or API response shapes using discriminated unions
• Setting up a strict tsconfig.json for a new project to prevent common runtime errors

TypeScript Configuration

Strict tsconfig.json

Enable strict plus these additional checks: