NonConfigurationInstance.kt

import androidx.fragment.app.Fragment
import androidx.fragment.app.viewModels
import androidx.lifecycle.ViewModel

inline fun <reified T> Fragment.nonConfigurationInstance(
  noinline instanceProducer: () -> T
) = NonConfigurationInstanceLazy(
  instanceProducer = instanceProducer,
  instanceHolder = viewModels()
)

class NonConfigurationInstanceHolder<T> : ViewModel() {
  var nonConfigurationInstance: T? = null
}

class NonConfigurationInstanceLazy<T>(
  private val instanceProducer: () -> T,
  private val instanceHolder: Lazy<NonConfigurationInstanceHolder<T>>
) : Lazy<T> {
  override val value: T
    get() = with(instanceHolder.value) {
      nonConfigurationInstance ?: instanceProducer().also { nonConfigurationInstance = it }
    }

  override fun isInitialized() = instanceHolder.isInitialized()
}

class PaymentFragment : Fragment() {
  private val component by nonConfigurationInstance {
    DaggerPaymentComponent.factory().create(dependencies)
  }
}