androidx.lifecycle.serialization

inline fun <T : Any?> SavedStateHandle.saved(
    key: String? = null,
    configuration: SavedStateConfiguration = SavedStateConfiguration.DEFAULT,
    noinline init: () -> T
): ReadWriteProperty<Any?, T>

import androidx.lifecycle.serialization.saved

@Serializable data class User(val id: Int, val name: String)
class ProfileViewModel(savedStateHandle: SavedStateHandle) : ViewModel() {
    val user by savedStateHandle.saved(key = "bar") { User(123, "foo") }
}

fun <T : Any?> SavedStateHandle.saved(
    serializer: <Error class: unknown class><T>,
    key: String? = null,
    configuration: SavedStateConfiguration = SavedStateConfiguration.DEFAULT,
    init: () -> T
): ReadWriteProperty<Any?, T>

import androidx.lifecycle.serialization.saved

@Serializable data class User(val id: Int, val name: String)
class ProfileViewModel(savedStateHandle: SavedStateHandle) : ViewModel() {
    val user by
        savedStateHandle.saved(key = "bar", serializer = User::class.serializer()) {
            User(123, "foo")
        }
}