onEmpty

fun <T> Flow<T>.onEmpty(action: suspend FlowCollector<T>.() -> Unit): Flow<T>

Invokes the given action when this flow completes without emitting any elements. The receiver of the action is FlowCollector, so onEmpty can emit additional elements. For example:

emptyFlow<Int>().onEmpty {
emit(1)
emit(2)
}.collect { println(it) } // prints 1, 2

Sources

common source
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