type-safety

Branded types prevent mixing incompatible values by creating distinct type identities at compile time. Define a branded type with a unique symbol, then use boundary parsers to validate and transform inputs into branded domain objects, ensuring type safety across modules.

Parse at boundary by decoding unknown inputs into fully typed domain objects using schema validation. This ensures all data crossing module edges matches your type contract, eliminating runtime type mismatches and mixing of incompatible identifiers.

Yes. Branded IDs use TypeScript's type system to distinguish between logically different identifiers—like UserID vs OrderID—even if both are strings. The compiler prevents accidental mixing while parsers at boundaries validate raw inputs into branded identifiers.

Schema-driven workflows complement branded types by formalizing data contracts and validation rules. Combined with boundary parsing, schemas ensure inputs decode into properly typed domain objects, eliminating gaps between compile-time types and runtime guarantees.

Branded types create nominal identity, preventing accidental mixing of structurally identical but semantically distinct values. Use them when domain correctness depends on distinguishing between logically different types that share the same underlying representation.