Scalable Jetpack Compose Navigation

_ComposeNavigationFactory.kt

// An interface is created to allow a feature module to add their Composable to the NavGraph.
// Defined within a library module
interface ComposeNavigationFactory {
  fun create(builder: NavGraphBuilder, navController: NavHostController)
}

_Feature1ComposeNavigationFactory.kt

// An implementation of the interface, as well as a Dagger 2 module installed via hilt.
// Defined within a feature module
internal class Feature1ComposeNavigationFactory @Inject constructor() : ComposeNavigationFactory {
  override fun create(builder: NavGraphBuilder, navController: NavHostController) {
    builder.composable(
      route = "feature1",
      content = {
        Feature1(
          navController = navController
        )
      }
    )
  }
}

// Defined within the 'feature 1' module
@Module
@InstallIn(SingletonComponent::class)
internal interface ComposeNavigationFactoryModule {
  @Singleton
  @Binds
  @IntoSet
  fun bindComposeNavigationFactory(factory: Feature1ComposeNavigationFactory): ComposeNavigationFactory
}

ExampleActivity.kt

// An example of a set of factories being used to construct a NavHost.
// Potentially defined within the app module
@AndroidEntryPoint
class ExampleActivity: AppCompatActivity {
  @Inject
  lateinit var composeNavigationFactories: @JvmSuppressWildcards Set<ComposeNavigationFactory>

  @Composable
  fun JetpackNavigationHiltApp() {
    val navController = rememberNavController()

    NavHost(navController, startDestination = "feature1") {
      composeNavigationFactories.forEach { factory ->
        factory.create(this, navController)
      }
    }
  }
}