domain-modeling

Choosing TypeScript constructs for domain modeling in DDD involves mapping building blocks like entities, value objects, and ports to specific tools such as `class`, `type`, or Zod. This ensures architectural alignment and maintainability.

For a DDD value object, TypeScript types like `type` or Zod schemas are typically selected to ensure immutability and structural validation. This choice supports clear domain modeling without the overhead of class inheritance.

Hexagonal architecture maps TypeScript tools to domain layers by assigning `class` to entities and `interface` to ports. This separation ensures domain logic remains isolated from infrastructure concerns.

Knowing Zod is not strictly required but is highly beneficial for TypeScript domain modeling. Zod provides runtime validation capabilities that complement static types, ensuring data integrity for commands and DTOs.

Use `interface` for DDD ports when you need declaration merging or contract extension, and `type` for strict structural definitions. Selecting the right construct ensures proper hexagonal architecture boundary enforcement.

The best way to model a new entity in TypeScript is by defining its identity and lifecycle using a `class`. This approach encapsulates domain behavior and enforces invariants within your DDD architecture.