Export version from react-dom entry with react-server condition (facebook#29596)

Author: unstubbable

packages/react-dom/src/ReactDOMReactServer.js

@@ -8,6 +8,10 @@
  */
 
 // This is the subset of APIs that can be accessed from Server Component modules
+
+import ReactVersion from 'shared/ReactVersion';
+export {ReactVersion as version};
+
 export {default as __DOM_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './ReactDOMSharedInternals';
 export {
   prefetchDNS,