Add flight specific entry point for react package

fixtures/flight/package.json

@@ -67,7 +67,7 @@
     "prebuild": "cp -r ../../build/node_modules/* ./node_modules/",
     "start": "concurrently \"npm run start:server\" \"npm run start:client\"",
     "start:client": "node scripts/start.js",
-    "start:server": "NODE_ENV=development node --experimental-loader ./loader/index.js server",
+    "start:server": "NODE_ENV=development node --experimental-loader ./loader/index.js --conditions=react-server server",
     "start:prod": "node scripts/build.js && NODE_ENV=production node server",
     "build": "node scripts/build.js",
     "test": "node scripts/test.js --env=jsdom"

packages/react/npm/unstable-index.server.js

@@ -0,0 +1,7 @@
+'use strict';
+
+if (process.env.NODE_ENV === 'production') {
+  module.exports = require('./cjs/react-unstable-index.server.production.min.js');
+} else {
+  module.exports = require('./cjs/react-unstable-index.server.development.js');
+}

packages/react/package.json

@@ -17,9 +17,24 @@
     "umd/",
     "jsx-runtime.js",
     "jsx-dev-runtime.js",
+    "unstable-index.server.js",
     "unstable-cache.js"
   ],
   "main": "index.js",
+  "exports": {
+    ".": {
+      "react-server": "./unstable-index.server.js",
+      "default": "./index.js"
+    },
+    "./index": {
+      "react-server": "./unstable-index.server.js",
+      "default": "./index.js"
+    },
+    "./build-info.json": "./build-info.json",
+    "./jsx-runtime": "./jsx-runtime.js",
+    "./jsx-dev-runtime": "./jsx-dev-runtime.js",
+    "./": "./"
+  },
   "repository": {
     "type": "git",
     "url": "https://github.com/facebook/react.git",

packages/react/unstable-index.server.experimental.js

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+export {
+  Children,
+  createRef,
+  forwardRef,
+  lazy,
+  memo,
+  useCallback,
+  useContext,
+  useDebugValue,
+  useMemo,
+  useMutableSource as unstable_useMutableSource,
+  createMutableSource as unstable_createMutableSource,
+  Fragment,
+  Profiler,
+  StrictMode,
+  Suspense,
+  createElement,
+  cloneElement,
+  isValidElement,
+  version,
+  __SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED,
+  // exposeConcurrentModeAPIs
+  useDeferredValue as unstable_useDeferredValue,
+  SuspenseList as unstable_SuspenseList,
+  unstable_useOpaqueIdentifier,
+  // enableDebugTracing
+  unstable_DebugTracingMode,
+} from './src/React';

packages/react/unstable-index.server.js

@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+throw new Error(
+  'This entry point is not yet supported outside of experimental channels',
+);

scripts/rollup/bundles.js

@@ -90,6 +90,15 @@ const bundles = [
     externals: [],
   },
 
+  /******* Isomorphic Server Only *******/
+  {
+    bundleTypes: [NODE_DEV, NODE_PROD],
+    moduleType: ISOMORPHIC,
+    entry: 'react/unstable-index.server',
+    global: 'React',
+    externals: [],
+  },
+
   /******* React JSX Runtime *******/
   {
     bundleTypes: [

scripts/rollup/forks.js

@@ -43,7 +43,7 @@ const forks = Object.freeze({
       // happens. Other bundles just require('object-assign') anyway.
       return null;
     }
-    if (entry === 'react') {
+    if (entry === 'react' || entry === 'react/unstable-index.server') {
       // Use the forked version that uses ES modules instead of CommonJS.
       return 'shared/forks/object-assign.inline-umd.js';
     }
@@ -64,8 +64,8 @@ const forks = Object.freeze({
   // Without this fork, importing `shared/ReactSharedInternals` inside
   // the `react` package itself would not work due to a cyclical dependency.
   'shared/ReactSharedInternals': (bundleType, entry, dependencies) => {
-    if (entry === 'react') {
-      return 'react/src/ReactSharedInternals';
+    if (entry === 'react' || entry === 'react/unstable-index.server') {
+      return 'react/src/ReactSharedInternals.js';
     }
     if (!entry.startsWith('react/') && dependencies.indexOf('react') === -1) {
       // React internals are unavailable if we can't reference the package.