Stop exporting dev-only methods production builds

Author: eps1lon

packages/react-dom/src/__tests__/ReactTestUtilsAct-test.js

@@ -779,13 +779,10 @@ function runActTests(render, unmount, rerender) {
         });
       }
     });
-    describe('throw in prod mode', () => {
-      // @gate !__DEV__
-      it('warns if you try to use act() in prod mode', () => {
-        expect(() => act(() => {})).toThrow(
-          'act(...) is not supported in production builds of React',
-        );
-      });
+
+    // @gate !__DEV__
+    it('is not available in prod mode', () => {
+      expect(() => act(() => {})).toThrow('act is not a function');
     });
   });
 }

packages/react-reconciler/src/__tests__/ReactIsomorphicAct-test.js

@@ -50,6 +50,11 @@ describe('isomorphic act()', () => {
     return text;
   }
 
+  // @gate !__DEV__
+  it('is not exported in production builds', () => {
+    expect(React).not.toHaveProperty('act');
+  });
+
   // @gate __DEV__
   it('bypasses queueMicrotask', async () => {
     const root = ReactNoop.createRoot();

packages/react-reconciler/src/__tests__/ReactOwnerStacks-test.js

@@ -31,6 +31,11 @@ describe('ReactOwnerStacks', () => {
     );
   }
 
+  // @gate !__DEV__
+  it('is not exported in production buids', () => {
+    expect(React).not.toHaveProperty('captureOwnerStack');
+  });
+
   // @gate __DEV__ && enableOwnerStacks
   it('can get the component owner stacks during rendering in dev', async () => {
     let stack;

packages/react/index.js

@@ -23,8 +23,6 @@ export type ElementRef<C> = React$ElementRef<C>;
 export type Config<Props, DefaultProps> = React$Config<Props, DefaultProps>;
 export type ChildrenArray<+T> = $ReadOnlyArray<ChildrenArray<T>> | T;
 
-// Export all exports so that they're available in tests.
-// We can't use export * from in Flow for some reason.
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   __COMPILER_RUNTIME,

packages/react/index.stable.development.js

@@ -0,0 +1,51 @@
+/**
+ * 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
+ */
+
+export {
+  __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
+  __COMPILER_RUNTIME,
+  Children,
+  Component,
+  Fragment,
+  Profiler,
+  PureComponent,
+  StrictMode,
+  Suspense,
+  cloneElement,
+  createContext,
+  createElement,
+  createRef,
+  use,
+  forwardRef,
+  isValidElement,
+  lazy,
+  memo,
+  cache,
+  unstable_useCacheRefresh,
+  startTransition,
+  useId,
+  useCallback,
+  useContext,
+  useDebugValue,
+  useDeferredValue,
+  useEffect,
+  useImperativeHandle,
+  useInsertionEffect,
+  useLayoutEffect,
+  useMemo,
+  useReducer,
+  useOptimistic,
+  useRef,
+  useState,
+  useSyncExternalStore,
+  useTransition,
+  useActionState,
+  version,
+  act, // DEV-only
+} from './src/ReactClient';

packages/react/index.stable.js

@@ -10,7 +10,6 @@
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   __COMPILER_RUNTIME,
-  act,
   Children,
   Component,
   Fragment,

scripts/jest/setupHostConfigs.js

@@ -43,9 +43,9 @@ function resolveEntryFork(resolvedEntry, isFBBundle) {
       }
 
       resolvedEntry = nodePath.join(resolvedEntry, '..', entrypoint);
-      const developmentEntry = resolvedEntry.replace('.js', '.development.js');
-      if (fs.existsSync(developmentEntry)) {
-        return developmentEntry;
+      const devEntry = resolvedEntry.replace('.js', '.development.js');
+      if (__DEV__ && fs.existsSync(devEntry)) {
+        return devEntry;
       }
       if (fs.existsSync(resolvedEntry)) {
         return resolvedEntry;
@@ -60,7 +60,7 @@ function resolveEntryFork(resolvedEntry, isFBBundle) {
       __EXPERIMENTAL__ ? '.modern.fb.js' : '.classic.fb.js'
     );
     const devFBEntry = resolvedFBEntry.replace('.js', '.development.js');
-    if (fs.existsSync(devFBEntry)) {
+    if (__DEV__ && fs.existsSync(devFBEntry)) {
       return devFBEntry;
     }
     if (fs.existsSync(resolvedFBEntry)) {
@@ -77,14 +77,14 @@ function resolveEntryFork(resolvedEntry, isFBBundle) {
     __EXPERIMENTAL__ ? '.experimental.js' : '.stable.js'
   );
   const devForkedEntry = resolvedForkedEntry.replace('.js', '.development.js');
-  if (fs.existsSync(devForkedEntry)) {
+  if (__DEV__ && fs.existsSync(devForkedEntry)) {
     return devForkedEntry;
   }
   if (fs.existsSync(resolvedForkedEntry)) {
     return resolvedForkedEntry;
   }
   const plainDevEntry = resolvedEntry.replace('.js', '.development.js');
-  if (fs.existsSync(plainDevEntry)) {
+  if (__DEV__ && fs.existsSync(plainDevEntry)) {
     return plainDevEntry;
   }
   // Just use the plain .js one.

scripts/rollup/build.js

@@ -571,7 +571,7 @@ function shouldSkipBundle(bundle, bundleType) {
   return false;
 }
 
-function resolveEntryFork(resolvedEntry, isFBBundle) {
+function resolveEntryFork(resolvedEntry, isFBBundle, isDev) {
   // Pick which entry point fork to use:
   // .modern.fb.js
   // .classic.fb.js
@@ -586,23 +586,20 @@ function resolveEntryFork(resolvedEntry, isFBBundle) {
       '.js',
       __EXPERIMENTAL__ ? '.modern.fb.js' : '.classic.fb.js'
     );
-    const developmentFBEntry = resolvedFBEntry.replace(
-      '.js',
-      '.development.js'
-    );
-    if (fs.existsSync(developmentFBEntry)) {
-      return developmentFBEntry;
+    const devFBEntry = resolvedFBEntry.replace('.js', '.development.js');
+    if (isDev && fs.existsSync(devFBEntry)) {
+      return devFBEntry;
     }
     if (fs.existsSync(resolvedFBEntry)) {
       return resolvedFBEntry;
     }
     const resolvedGenericFBEntry = resolvedEntry.replace('.js', '.fb.js');
-    const developmentGenericFBEntry = resolvedGenericFBEntry.replace(
+    const devGenericFBEntry = resolvedGenericFBEntry.replace(
       '.js',
       '.development.js'
     );
-    if (fs.existsSync(developmentGenericFBEntry)) {
-      return developmentGenericFBEntry;
+    if (isDev && fs.existsSync(devGenericFBEntry)) {
+      return devGenericFBEntry;
     }
     if (fs.existsSync(resolvedGenericFBEntry)) {
       return resolvedGenericFBEntry;
@@ -614,7 +611,7 @@ function resolveEntryFork(resolvedEntry, isFBBundle) {
     __EXPERIMENTAL__ ? '.experimental.js' : '.stable.js'
   );
   const devForkedEntry = resolvedForkedEntry.replace('.js', '.development.js');
-  if (fs.existsSync(devForkedEntry)) {
+  if (isDev && fs.existsSync(devForkedEntry)) {
     return devForkedEntry;
   }
   if (fs.existsSync(resolvedForkedEntry)) {
@@ -633,7 +630,7 @@ async function createBundle(bundle, bundleType) {
 
   const {isFBWWWBundle, isFBRNBundle} = getBundleTypeFlags(bundleType);
 
-  let resolvedEntry = resolveEntryFork(
+  const resolvedEntry = resolveEntryFork(
     require.resolve(bundle.entry),
     isFBWWWBundle || isFBRNBundle,
     !isProductionBundleType(bundleType)