Flutter Dependency Injection (Injectable)

Dependency Injection

Priority: P1 (HIGH)

Automated class dependency management using get_it and injectable.

Structure

core/injection/
├── injection.dart # Initialization & setup
└── modules/ # Third-party dependency modules (Dio, Storage)

Implementation Guidelines

• Automated Registration: Use @injectable annotations; avoid manual registry calls.
• @LazySingleton: Default for repositories, services, and data sources (init on demand).
• @injectable (Factory): Default for BLoCs to ensure state resets on every request.
• Abstract Injection: Always register implementations as abstract interfaces (as: IService).
• Modules: Use @module for registering third-party instances (e.g., Dio, SharedPreferences).
• Constructor Injection: Use mandatory constructor parameters; injectable resolves them.
• Test Mocks: Swap implementations in setUp using getIt.registerLazySingleton for testing.

Reference & Examples

For module configuration and initialization templates: See references/REFERENCE.md.

Related Topics

layer-based-clean-architecture | testing