Ios PromiseKit:使用不同类型的Promise数组在（实现：）时调用

我有一系列不同类型的承诺。在这种特殊情况下，

Promise

和

Promise

我希望在（履行时：）

例如：

let fileName = "somefilename"

 let videos: [URL] = selectedItems.compactMap { guard $0.isVideo else {return nil}; return URL(string: $0.url) }
 let images: [URL] = selectedItems.compactMap { guard !$0.isVideo else {return nil}; return URL(string: $0.url) }
 let videoRequests = videos.map { RemoteDownloadManager.shared.downloadVideo(from: $0, withName: fileName) }
 let imgRequests = images.map {RemoteDownloadManager.shared.downloadImage(from: $0)}

我有两个承诺数组，但类型不同：

[Promise]

和

[Promise]
when(fulfilled: [imgRequests, videoRequests])
        .done { items in
                  // [...]
}