typescript

Strict type safety in TypeScript enforces compiler flags that catch potential errors at compile time. Enable `strict` mode in tsconfig.json to activate checks like `noImplicitAny`, `strictNullChecks`, and `strictFunctionTypes`. This prevents common runtime errors and forces explicit type annotations across your codebase.

Discriminated unions are TypeScript types that use a shared literal field to narrow type safety across variants. Use them to model operations with multiple outcomes—like success or failure states—enabling exhaustive type checking and clearer error handling patterns without runtime type guards.

Implement error handling using Result patterns that return either success or error values explicitly typed. This approach avoids throwing exceptions, provides type-safe error propagation, and forces callers to handle failures before accessing successful data, reducing unhandled runtime errors.

Yes. TypeScript integrates with pnpm for dependency management and Vitest for unit testing. This Skill configures both tools within a cohesive workflow, ensuring type-safe tests and fast test execution while maintaining strict type checking across your test suite.

Branded types use TypeScript's type system to create nominal types that prevent accidental misuse of primitive values. Tag strings or numbers with a unique brand property so the compiler rejects mixing incompatible branded types—for example, distinguishing UserId from OrderId at compile time.

Biome provides linting and formatting for TypeScript code as part of this Skill's tooling configuration. It enforces consistent code style, catches potential bugs, and works alongside strict type checking to maintain code quality and readability across your project.