Domain layer: models, contracts, use cases

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The app's own vocabulary: domain models, their immutability, repository contracts, and when a use case is actually needed. This layer is pure Dart — it knows nothing about Flutter, HTTP or databases.

1. Domain models and immutability (freezed)

domainfreezedimmutabilitydart

2. DTO vs domain model, and mappers

domaindatajsonmapping

3. The repository contract: abstract classes and dependency inversion

domainrepositorydartdependency-inversion

4. Use cases: when you need one and when it hurts

domainuse-casetrade-offs

5. Keeping the domain pure: no flutter/material imports

domaindarttestingci