Ensure shared-prefix doesn't crash the editor

Author: davesnx

packages/server-reason-react-ppx/cram/ensure-attributes-are-present.t/run.t

@@ -16,4 +16,4 @@
     [@@platform js]
 
     let make ?(key : string option) (_Props : < > Js.t) = make ?key ()
-  end
+  end [@@platform js]