Check BrowserWindow's lifetime

atom/browser/api/atom_api_window.cc

@@ -177,6 +177,10 @@ mate::Wrappable* Window::New(v8::Isolate* isolate,
   return new Window(isolate, options);
 }
 
+bool Window::IsDestroyed() const {
+  return !window_ || window_->IsClosed();
+}
+
 void Window::Destroy() {
   window_->CloseContents(nullptr);
 }

atom/browser/api/atom_api_window.h

@@ -73,6 +73,9 @@ class Window : public mate::TrackableObject<Window>,
   void OnDevToolsClosed() override;
   void OnExecuteWindowsCommand(const std::string& command_name) override;
 
+  // mate::Wrappable:
+  bool IsDestroyed() const override;
+
  private:
   // APIs for NativeWindow.
   void Destroy();