ddd-type-duplication-across-layers

To keep TypeScript domain union types in sync with API models, update domain models and search the codebase to ensure infrastructure adapters and tests are updated consistently, preventing type mismatch build breaks.

Adding a value to a domain union type breaks API request mapping because the infrastructure layer hardcodes the same union value, causing a type mismatch in the adapter that maps domain models to API requests.

The best way to update domain models in a layered DDD architecture is to propagate changes safely by checking domains/models, infrastructure/api, and tests to ensure all references to updated union values remain consistent.

Yes, you can use this approach to map domain models to API models across the codebase by providing a disciplined method to synchronize domain union values and update references, reducing build failures and runtime errors.

You need to check domains, infrastructure, and tests for type divergence when updating domain models in a layered DDD architecture and when mapping to API models to ensure consistency across the codebase.