kmp-di

KMP Dependency Injection

Cross-platform dependency injection with Koin.

Koin Multiplatform Setup

Dependencies

// build.gradle.kts (shared module) — Koin 4.x, BOM-managed versions
kotlin {
    sourceSets {
        commonMain.dependencies {
            implementation(platform("io.insert-koin:koin-bom:4.2.2"))
            implementation("io.insert-koin:koin-core")
            // Compose Multiplatform UI only:
            implementation("io.insert-koin:koin-compose")
            implementation("io.insert-koin:koin-compose-viewmodel")
            // No Compose? The viewModel DSL alone is "io.insert-koin:koin-core-viewmodel"
            // (koin-compose-viewmodel already includes it transitively).
        }
        commonTest.dependencies {
            implementation("io.insert-koin:koin-test")  // test-only, never commonMain
        }
        androidMain.dependencies {
            implementation("io.insert-koin:koin-android")
        }
    }
}

Module Definition

// commonMain/kotlin/di/AppModule.kt
val sharedModule = module {
    // ViewModels — multiplatform since Koin 4.x (viewModel DSL in commonMain)
    viewModelOf(::HomeViewModel)
    viewModelOf(::DetailViewModel)

    // Use Cases
    factory { GetUsersUseCase(get()) }
    factory { GetUserDetailUseCase(get()) }

    // Repositories
    single<UserRepository> { UserRepositoryImpl(get(), get()) }

    // Data Sources
    single { UserApi(get()) }
    single { createDatabase(get()) }
}

Platform Modules

// androidMain/kotlin/di/PlatformModule.kt
val androidPlatformModule = module {
    includes(sharedModule)

    // Android-specific dependencies — Context comes from androidContext()
    // (configured in startKoin below), never `Context()` (it's abstract).
    single { PlatformConnectivityMonitor(androidContext()) }
    single { PlatformFileService(androidContext()) }
}

// iosMain/kotlin/di/PlatformModule.kt
val iosPlatformModule = module {
    includes(sharedModule)

    // iOS-specific dependencies
    single { PlatformConnectivityMonitor() }
    single { PlatformFileService() }
}