data object ProductList
data class ProductDetail(val id: String)

@Composable
fun MyApp() {

    // Create a back stack, specifying the key the app should start with
    val backStack = remember { mutableStateListOf<Any>(ProductList) }

    // Supply your back stack to a NavDisplay so it can reflect changes in the UI
    // ...more on this below...

    // Push a key onto the back stack (navigate forward), the navigation library will reflect the change in state
    backStack.add(ProductDetail(id = "ABC"))

    // Pop a key off the back stack (navigate back), the navigation library will reflect the change in state
    backStack.removeLastOrNull()
}
// [END android_compose_navigation3_basic_1]

@Composable
fun EntryProvider() {
    val backStack = remember { mutableStateListOf<Any>(ProductList) }
    NavDisplay(
        backStack = backStack,
        // [START android_compose_navigation3_basic_2]
        entryProvider = { key ->
            when (key) {
                is ProductList -> NavEntry(key) { Text("Product List") }
                is ProductDetail -> NavEntry(
                    key,
                    metadata = mapOf("extraDataKey" to "extraDataValue")
                ) { Text("Product ${key.id} ") }

                else -> {
                    NavEntry(Unit) { Text(text = "Invalid Key: $it") }
                }
            }
        }
        // [END android_compose_navigation3_basic_2]
    )
}