kmp-repositories

A repository pattern in Kotlin Multiplatform centralizes data access by defining shared interfaces in commonMain and platform-specific implementations for Android and iOS. This decouples domain logic from data sources, enabling consistent data flows across platforms while maintaining testability through dependency injection.

Yes. Define repository contracts in commonMain as expect interfaces, then provide actual implementations in androidMain and iosMain. This allows both platforms to share domain layer logic while using platform-specific data sources for remote and local data.

Implement a base repository class in commonMain that coordinates data fetching, caching, and error handling logic. Platform-specific repositories inherit this base and inject their own data sources, ensuring consistent behavior across Android and iOS with platform-appropriate error strategies.

Separate remote and local data sources as platform-specific implementations coordinated by the repository layer. The repository orchestrates these sources—fetching, caching, and mapping data between layers—while exposing a clean interface to the domain and presentation layers.

Dependency injection enables testable, maintainable repositories by decoupling data source implementations from repositories. While not strictly required, DI wiring in commonMain with platform-specific factories ensures clean separation and simplifies unit and integration testing across Android and iOS.

Use the repository pattern when you need consistent data access abstractions across multiple platforms, testable domain logic isolated from implementation details, or coordinated caching and error handling. It's essential for Kotlin Multiplatform projects targeting both Android and iOS with shared business logic.