grago

extension UIApplication {
    class func openAppSettings() {
        guard let url = URL(string: self.openSettingsURLString) else { return }
        self.shared.open(url, options: [:], completionHandler: nil)
    }
    
    class func openSubscriptionManagement() {
        guard let url = URL(string: "itms://apps.apple.com/account/subscriptions") else { return }
        self.shared.open(url, options: [:], completionHandler: nil)
    }

grago

extension Bundle {
    func decode<T: Decodable>(_ type: T.Type, from filename: String) -> T {
        guard let json = url(forResource: filename, withExtension: nil) else {
            fatalError("Failed to locate \(filename) in app bundle.")
        }

        guard let jsonData = try? Data(contentsOf: json) else {
            fatalError("Failed to load \(filename) from app bundle.")
        }