V3 Core Implementation

To build clean architecture TypeScript modules, separate domain entities, application use cases, and repository interfaces into distinct layers. This approach enforces strict typing boundaries and ensures deterministic behavior through isolated domain-driven design patterns.

Implement dependency injection by defining repository interfaces in the domain layer and wiring concrete implementations in the application layer. This allows use cases to remain decoupled from persistence concerns, ensuring core modules remain testable and strictly typed.

Unit test domain entities and use cases by leveraging dependency injection to inject mock repositories. This isolates domain logic and command handlers, allowing comprehensive integration testing for deterministic persistence and event handling without external dependencies.

You need bounded contexts when scaffolding new TypeScript core modules to isolate task, session, and health monitoring domains. This modular design prevents logic from bleeding across boundaries and maintains clean separation between domain events and application orchestration.

Refactor existing TypeScript services into clean architecture layers when ad hoc code begins compromising testability or strict typing. Transitioning to domain-driven aggregates, value objects, and dependency injection restores deterministic behavior and modular design.

Your TypeScript domain logic has tightly coupled dependencies because repositories are likely implemented directly within domain entities. Introduce dependency injection and the repository pattern to invert dependencies, keeping domain events and aggregates strictly separated from persistence.