What a mergeWith Flow operator might look like

flow_merge.kt

@FlowPreview
fun <T> Flow<T>.mergeWith(other: Flow<T>): Flow<T> = flow {
    coroutineScope {
        launch {
            other.collect {
                emit(it)
            }
        }

        launch {
            collect {
                emit(it)
            }
        }
    }
}