How to detect whether targetEnvironment is iPadOS in SwiftUI?

I use this in my code:

    private var idiom : UIUserInterfaceIdiom { UIDevice.current.userInterfaceIdiom }
    private var isPortrait : Bool { UIDevice.current.orientation.isPortrait }

Then you can do this:

    var body: some View {
        NavigationView {
            masterView()

            if isPortrait {
                portraitDetailView()
            } else {
                landscapeDetailView()
            }
        }
    }

    private func portraitDetailView() -> some View {
        if idiom == .pad {
            return Text("iPadOS")
        } else {
            return Text("iOS")
        }
    }