type-patterns

Type-safe error handling in TypeScript replaces throw-based exceptions with a typed Result<T, E> pattern and discriminated unions, enabling safer and more predictable control flow for application logic.

The best way to ensure exhaustive error handling in TypeScript is by combining discriminated unions for AppError variants with ts-pattern for exhaustive pattern matching, guaranteeing all error cases are handled.

You can use a Result type for data fetching and validation by returning Result<T, AppError> instead of throwing, then applying exhaustive matching with ts-pattern in the caller to handle success and error states explicitly.

Yes, ts-pattern works with discriminated unions for domain modeling by enabling exhaustive pattern matching, which guarantees all cases are handled safely across APIs, validation, and data transformations.

You should replace throw-based error handling with a Result type when building application logic requiring robust error handling, domain modeling, and exhaustive case analysis for data fetching, validation, and transformation.