Jetpack Compose Navigation3 - Destiination sealed interface

1-sealed-interface.kt

@Serializable
sealed interface AppDestination {
    val label: String
    @get:DrawableRes val iconRes: Int
}

@Serializable
data object HomeDestination : AppDestination {
    override val label = "Home"; override val iconRes = R.drawable.ic_home
}

@Serializable
data class DetailDestination(val id: String) : AppDestination {
    override val label = "Detail"; override val iconRes = R.drawable.ic_detail
}

2-navhost.kt

NavHost(navController = navController, startDestination = HomeDestination) {
    composable<HomeDestination> { HomeScreen() }
    composable<DetailDestination> { entry ->
        val dest = entry.toRoute<DetailDestination>()
        DetailScreen(dest.id)
    }
}

Navigation3 時代の Destination 設計：sealed interface による型安全な実装パターンと使い分け
https://android.benigumo.com/20260304/navigation3-sealed-interface/