     public typealias DecisionHandler = (WKNavigationResponsePolicy) -> Void
     /// WKNavigationResponsePolicyEvent emits a tuple event of  WKWebView + WKNavigationResponse + DecisionHandler
     public typealias WKNavigationResponsePolicyEvent = ( webView: WKWebView, reponse: WKNavigationResponse, handler: DecisionHandler)
-    
+
     private func navigationEventWith(_ arg: [Any]) throws -> WKNavigationEvent {
         let view = try castOrThrow(WKWebView.self, arg[0])
         let nav = try castOrThrow(WKNavigation.self, arg[1])

        }
        return ControlEvent(events: source)
    }
}

fileprivate extension Selector {

    static let didReceiveChallenge = #selector(WKNavigationDelegate.webView(_:didReceive:completionHandler:))
    @available(iOS 9.0, *)
    static let didTerminate = #selector(WKNavigationDelegate.webViewWebContentProcessDidTerminate(_:))
    static let decidePolicyNavigationResponse = #selector(WKNavigationDelegate.webView(_:decidePolicyFor:decisionHandler:) as ((WKNavigationDelegate) -> (WKWebView, WKNavigationResponse, @escaping(WKNavigationResponsePolicy) -> Void) -> Void)?)
}


