abstract fun whenElementKnown(action: Action<in T>): Unit
Registers an action to execute when an element becomes known. The action is only executed for those elements that are required. Fails if any element has already been finalized.
action - The action to execute for each element becomes known.
abstract fun <S : Any> whenElementKnown(type: Class<S>, action: Action<in S>): Unit
Registers an action to execute when an element of the given type becomes known. The action is only executed for those elements that are required. Fails if any matching element has already been finalized.
type - The type of element to select.
action - The action to execute for each element becomes known.