vmextension.kt

@Suppress("UNCHECKED_CAST")
class ViewModelFactory<VM : ViewModel>(
    private val creator: () -> VM
) : ViewModelProvider.NewInstanceFactory() {
    override fun <T : ViewModel> create(modelClass: Class<T>): T = creator() as T
}

inline fun <reified VM : ViewModel> Fragment.viewModels(
    noinline ownerProducer: () -> ViewModelStoreOwner = { this },
    noinline customCreator: (() -> VM)? = null
): Lazy<VM> =
    viewModels(ownerProducer = ownerProducer, factoryProducer = customCreator?.let { { ViewModelFactory(it) } })


// Usage:
private val OtherViewModel: OtherViewModel by viewModels {
    OtherViewModel(fancyViewModel)
}

class OtherViewModel(
    private val fancyViewModel: FancyViewModel,
    private val dispatchers: DispatchersProvider = DefaultDispatchersProvider(),
) : ViewModel() {