typescript-patterns

Discriminated unions in TypeScript let you create type-safe API responses by tagging each state (loading, success, error) with a unique literal type. The compiler enforces exhaustive handling of all cases at compile time, preventing runtime errors and improving type safety across your entire request flow.

Utility types are built-in TypeScript constructs like Partial, Readonly, and Record that transform existing types for specific use cases. Use them to enforce compile-time safety when designing generic components, API responses, and reusable type patterns without repeating type definitions.

Design generic components by combining conditional types, type parameters, and type guards to ensure strict typing at every layer. This approach catches API contract mismatches, incorrect prop usage, and payload inconsistencies before runtime, reducing bugs in React and server-side TypeScript projects.

Type guards and assertion helpers use runtime checks combined with TypeScript's type narrowing to validate data shape and refine types safely. They prevent unsafe type casts and ensure discriminated unions and API responses conform to expected schemas at compile and runtime.

Yes. Mapped types iterate over object keys to generate precise derived types, while template literal types construct string-literal types dynamically. Together they enforce compile-time safety for event emitters, API routes, and data validation patterns, reducing type-related bugs significantly.