Some Image

SomeImage.swift

#if os(macOS)
import AppKit
#else
import UIKit
#endif
import SwiftUI

#if os(macOS)
typealias SomeImage = NSImage
#else
typealias SomeImage = UIImage
#endif

#if os(macOS)
extension Data {
    var bitmap: NSBitmapImageRep? { NSBitmapImageRep(data: self) }
}
extension NSBitmapImageRep {
    var png: Data? { representation(using: .png, properties: [:]) }
}
extension SomeImage {
    func pngData() -> Data? {
        tiffRepresentation?.bitmap?.png
    }
}
#endif

extension Image {
    init(image: SomeImage) {
        #if os(macOS)
        self.init(nsImage: image)
        #else
        self.init(uiImage: image)
        #endif
    }
}