Add server add-on babel transform

Reviewed By: antonk52

Differential Revision: D34393126

fbshipit-source-id: d910392d9ac7e7a44e2e9ede690a6bed77f018c7

desktop/pkg-lib/src/runBuild.tsx

@@ -166,9 +166,7 @@ export default async function bundlePlugin(
       dev,
       sourceMapPath: options?.sourceMapPathServerAddOn,
       babelTransformerPath: require.resolve(
-        `flipper-babel-transformer/${
-          dev ? 'lib/transform-server-dev' : 'lib/transform-server-prod'
-        }`,
+        'flipper-babel-transformer/lib/transform-server-add-on',
       ),
     });
   }