typescript-pro

End-to-end type safety in TypeScript requires advanced type-system techniques across your full stack. Use discriminated unions, type guards, and conditional types to eliminate runtime errors, then wire them through your API layer with tRPC to maintain type safety from client to server without manual synchronization.

Discriminated unions pair a literal type field with variant types to create exhaustive pattern matching; type guards are functions that narrow types at runtime. Together they enable the compiler to verify all cases are handled, eliminating silent failures and making invalid states unrepresentable in your type system.

Generics with constraints let you write reusable functions and interfaces that preserve type information across transformations. Branded types add compile-time validation for domain concepts like user IDs, while the satisfies operator ensures implementations match their intended types without widening inference.

Yes. Enable strict mode in tsconfig to enforce null checks, implicit any bans, and strict property initialization. Combine project references to partition large codebases and improve build performance, then use tRPC to share types across your full-stack API automatically while maintaining strict type checking.

Configure tsconfig with strict: true, enable declaration generation to preserve type information in builds, use project references to isolate compilation units, and apply branded types for domain validation. This foundation prevents type errors at compile time and supports incremental builds for large applications.

TypeScript's type system erases at runtime, so validation still requires runtime checks. Type guards and discriminated unions catch errors during execution, and tRPC bridges the gap for APIs by sharing types between client and server, eliminating serialization mismatches without extra libraries.