---
description: "Injectable dependency injection conventions for {{PROJECT_NAME}} — Pillar 4"
alwaysApply: true
---

# Injectable (get_it) Standards — {{PROJECT_NAME}}

## Setup
```dart
// lib/core/di/injection.dart
@InjectableInit()
void configureDependencies() => getIt.init();
```

## Annotations
```dart
@singleton      // One instance for app lifetime
@lazySingleton  // Created on first access (preferred for most services)
@injectable     // New instance each time (use sparingly)
@factoryMethod  // Custom factory logic
```

## Example
```dart
@lazySingleton
class ProductRepository {
  final DioClient _client;
  const ProductRepository(this._client);  // Constructor injection
}

@injectable
class GetProductsUseCase {
  final ProductRepository _repo;
  const GetProductsUseCase(this._repo);
}
```

## Rules
- Run `dart run build_runner build` after adding/modifying `@injectable` annotations
- **NEVER** use `getIt<T>()` in widget `build()` methods — inject via constructor or provider
- Use `@module` for third-party registrations (Dio, SharedPreferences, etc.)
- Register environment-specific implementations with `@Environment('dev')` / `@Environment('prod')`