Fork ReactDOMSharedInternals for www (#25791)

This isn't the right way to do this, but internally we have some
restrictions so we need to add an indirection. Let's land this now so we
can catch up our sync and then fix forward from there.

Co-authored-by: Jan Kassens <jkassens@meta.com>

packages/shared/forks/ReactDOMSharedInternals.www.js

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+// $FlowIgnore[cannot-resolve-module] provided by www
+const ReactDOM = require('ReactDOMComet');
+
+const ReactDOMSharedInternals =
+  ReactDOM.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
+
+export default ReactDOMSharedInternals;

scripts/rollup/forks.js

@@ -70,6 +70,14 @@ const forks = Object.freeze({
     if (entry === 'react-dom' || entry === 'react-dom/server-rendering-stub') {
       return './packages/react-dom/src/ReactDOMSharedInternals.js';
     }
+    switch (bundleType) {
+      case FB_WWW_DEV:
+      case FB_WWW_PROD:
+      case FB_WWW_PROFILING:
+        return './packages/shared/forks/ReactDOMSharedInternals.www.js';
+      default:
+        break;
+    }
     if (
       !entry.startsWith('react-dom/') &&
       dependencies.indexOf('react-dom') === -1