Add messagingEnabled prop

windows/ReactNativeWebView/ReactWebView.cpp

             });
     }
 
+    void ReactWebView::SetMessagingEnabled(bool enabled) {
+      this->m_messagingEnabled = enabled;
+    }
+
 } // namespace winrt::ReactNativeWebView::implementation

windows/ReactNativeWebView/ReactWebView.h

     public:
         ReactWebView(Microsoft::ReactNative::IReactContext const& reactContext);
         void PostMessage(winrt::hstring const& message);
+        void SetMessagingEnabled(bool enabled);
 
     private:
+        bool m_messagingEnabled{ false };
         winrt::Windows::UI::Xaml::Controls::WebView m_webView{ nullptr };
         Microsoft::ReactNative::IReactContext m_reactContext{ nullptr };
         winrt::Windows::UI::Xaml::Controls::WebView::NavigationStarting_revoker m_navigationStartingRevoker{};

windows/ReactNativeWebView/ReactWebView.idl

     runtimeclass ReactWebView : Windows.UI.Xaml.Controls.UserControl{
         ReactWebView(Microsoft.ReactNative.IReactContext context);
         void PostMessage(String message);
+        void SetMessagingEnabled(Boolean enabled);
     };
 } // namespace ReactNativeWebView

windows/ReactNativeWebView/ReactWebViewManager.cpp

     IMapView<hstring, ViewManagerPropertyType> ReactWebViewManager::NativeProps() noexcept {
         auto nativeProps = winrt::single_threaded_map<hstring, ViewManagerPropertyType>();
         nativeProps.Insert(L"source", ViewManagerPropertyType::Map);
+        nativeProps.Insert(L"backgroundColor", ViewManagerPropertyType::Color); // Does this really work?
+        nativeProps.Insert(L"messagingEnabled", ViewManagerPropertyType::Boolean);
         return nativeProps.GetView();
     }
 
                     auto color = propertyValue.To<winrt::Color>();
                     webView.DefaultBackgroundColor(color.A==0 ? winrt::Colors::Transparent() : color);
                 }
+                else if (propertyName == "messagingEnabled") {
+                  auto messagingEnabled = propertyValue.To<bool>();
+                  if (auto reactWebView = content.try_as<ReactNativeWebView::ReactWebView>()) {
+                    reactWebView.SetMessagingEnabled(messagingEnabled);
+                  }
+                }
             }
         }
     }