sequencedFlatMapEach(on:_:)

An overload of sequencedFlatMapEach(on:_:) which returns a Void future instead of [Void] when the result type of the transform closure is Void.

Collection+Flatten.swift:51
func sequencedFlatMapEach(on eventLoop: EventLoop, _ transform: @escaping (_ element: Element) -> EventLoopFuture<Void>) -> EventLoopFuture<Void>