better-result-adopt

To migrate error handling to typed Result objects in TypeScript, define domain-level errors as TaggedError classes, wrap boundaries with Result.try/tryPromise, and update callers to return Result types with typed error unions.

Railway-oriented programming for TypeScript error handling structures synchronous and asynchronous code paths into Result chains, replacing thrown exceptions and Promise rejections with typed, propagating Result objects.

You can convert Promise rejections to typed errors by gradually wrapping API and IO boundaries with Result.tryPromise, then migrating callers to handle the returned Result types and typed error unions safely.

Yes, this approach supports gradually migrating legacy TypeScript error paths by wrapping specific boundaries with Result.try or tryPromise first, then progressively updating callers to ensure type-safe error propagation.

The best way to define domain-level errors for TypeScript refactoring is creating minimal TaggedError classes, which allow you to categorize and type-safely propagate business logic errors as typed Result objects.