inline fun <reified A : Any, reified R : Any> WinterAware.factoryOrNull(qualifier: Any? = null, generics: Boolean = false): Factory<A, R>?
Retrieve an optional factory function that takes an argument of type A and returns R.
qualifier - An optional qualifier of the dependency.
generics - Preserves generic type parameters if set to true (default = false).
io.jentz.winter.EntryNotFoundException -
Return
The factory that takes A and returns R or null if factory provider doesn't exist.