better-result-adopt

To migrate from try/catch to typed Result-based error handling, start at I/O boundaries and replace thrown errors with TaggedError types. Wrap operations using Result.try and Result.tryPromise, then progressively propagate Result types across module function signatures for type-safe failure handling.

TaggedError is a typed error definition pattern that ensures type-safe error propagation by replacing unknown caught errors with explicitly typed failures. It enables generator-based patterns and Result types to guarantee clear, structured failure handling across domain and infrastructure layers.

Yes, you can gradually adopt railway-oriented error handling by starting at I/O boundaries and incrementally converting to Result types. This approach allows you to progressively propagate typed errors across modules without requiring a full codebase rewrite, improving maintainability step by step.

The best way to handle promise rejections with Result types is using Result.tryPromise to wrap async boundaries. This converts rejected promises into typed Result failures, allowing you to define infrastructure errors with TaggedError and propagate them safely through your application.

Yes, defining separate TaggedError classes for domain, infrastructure, and runtime errors is recommended. This categorization ensures clear failure handling boundaries, allowing Result types to accurately represent distinct error sources during type-safe propagation across different application layers.