fix(metadata): fix getRefetchMetadata to handle both commonjs and es … (

#2875)

Summary:
…modules, fix #2874

this is the same approach of relay-compiler

we could move this to a helper function
Pull Request resolved: #2875

Reviewed By: josephsavona

Differential Revision: D18017687

Pulled By: jstejada

fbshipit-source-id: b7627181a36f5c5a7e6806698cf6efffe860d00c

packages/relay-experimental/getRefetchMetadata.js

@@ -47,7 +47,12 @@ function getRefetchMetadata(
     fragmentNode.name,
   );
 
-  const refetchableRequest = refetchMetadata.operation;
+  // handle both commonjs and es modules
+  const refetchableRequest:
+    | ConcreteRequest
+    | string = (refetchMetadata: $FlowFixMe).operation.default
+    ? (refetchMetadata: $FlowFixMe).operation.default
+    : refetchMetadata.operation;
   const fragmentRefPathInResponse = refetchMetadata.fragmentPathInResult;
   invariant(
     typeof refetchableRequest !== 'string',