convert Layout plugin

Summary: _typescript_

Reviewed By: passy

Differential Revision: D17153997

fbshipit-source-id: 308a070b86430a9256beb93b4d3e5f8d5b6c6e52

src/fb-stubs/LayoutInspectorSidebarExtensions.tsx

@@ -4,4 +4,15 @@
  * LICENSE file in the root directory of this source tree.
  * @format
  */
-export default [];
+
+import {PluginClient, Client, ElementID} from 'flipper';
+import {Logger} from 'src/fb-interfaces/Logger';
+
+export default [] as Array<
+  (
+    client: PluginClient,
+    realClient: Client,
+    selectedNode: ElementID,
+    logger: Logger,
+  ) => React.ReactNode
+>;