Migrate LayoutInspectorSidebarExtensions

Summary: _typescript_

Reviewed By: danielbuechele

Differential Revision: D16666703

fbshipit-source-id: cf16f9cdc97a739f0de52f31319e8061eea03c6f

src/fb-stubs/LayoutInspectorSidebarExtensions.tsx

@@ -0,0 +1,7 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+export default [];