Export captureOwnerStacks only in DEV "react" builds

Only with the enableOwnerStacks flag (which is not on in www).

packages/react-reconciler/src/ReactCurrentFiber.js

@@ -44,7 +44,7 @@ export function getCurrentParentStackInDev(): string {
   return '';
 }
 
-function getCurrentFiberStackInDev(stack: Error): string {
+function getCurrentFiberStackInDev(stack: null | Error): string {
   if (__DEV__) {
     if (current === null) {
       return '';

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

@@ -0,0 +1,65 @@
+/**
+ * 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.
+ *
+ * @emails react-core
+ * @jest-environment node
+ */
+'use strict';
+
+let React;
+let ReactNoop;
+let act;
+
+describe('ReactOwnerStacks', () => {
+  beforeEach(function () {
+    jest.resetModules();
+
+    React = require('react');
+    ReactNoop = require('react-noop-renderer');
+    act = require('internal-test-utils').act;
+  });
+
+  function normalizeCodeLocInfo(str) {
+    return (
+      str &&
+      str.replace(/\n +(?:at|in) ([\S]+)[^\n]*/g, function (m, name) {
+        return '\n    in ' + name + ' (at **)';
+      })
+    );
+  }
+
+  // @gate __DEV__ && enableOwnerStacks
+  it('can get the component owner stacks during rendering in dev', async () => {
+    let stack;
+
+    function Foo() {
+      return <Bar />;
+    }
+    function Bar() {
+      return (
+        <div>
+          <Baz />
+        </div>
+      );
+    }
+    function Baz() {
+      stack = React.captureOwnerStack();
+      return <span>hi</span>;
+    }
+
+    await act(() => {
+      ReactNoop.render(
+        <div>
+          <Foo />
+        </div>,
+      );
+    });
+
+    expect(normalizeCodeLocInfo(stack)).toBe(
+      '\n    in Bar (at **)' + '\n    in Foo (at **)',
+    );
+  });
+});

packages/react-test-renderer/src/ReactTestRenderer.js

@@ -61,6 +61,7 @@ import {
   disableLegacyMode,
 } from 'shared/ReactFeatureFlags';
 
+// $FlowFixMe[prop-missing]: This is only in the development export.
 const act = React.act;
 
 // TODO: Remove from public bundle

packages/react/index.development.js

@@ -0,0 +1,80 @@
+/**
+ * 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
+ */
+
+// Keep in sync with https://github.com/facebook/flow/blob/main/lib/react.js
+export type ComponentType<-P> = React$ComponentType<P>;
+export type AbstractComponent<
+  -Config,
+  +Instance = mixed,
+> = React$AbstractComponent<Config, Instance>;
+export type ElementType = React$ElementType;
+export type Element<+C> = React$Element<C>;
+export type Key = React$Key;
+export type Ref<C> = React$Ref<C>;
+export type Node = React$Node;
+export type Context<T> = React$Context<T>;
+export type Portal = React$Portal;
+export type ElementProps<C> = React$ElementProps<C>;
+export type ElementConfig<C> = React$ElementConfig<C>;
+export type ElementRef<C> = React$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,
+  Children,
+  Component,
+  Fragment,
+  Profiler,
+  PureComponent,
+  StrictMode,
+  Suspense,
+  cloneElement,
+  createContext,
+  createElement,
+  createRef,
+  use,
+  forwardRef,
+  isValidElement,
+  lazy,
+  memo,
+  cache,
+  startTransition,
+  unstable_DebugTracingMode,
+  unstable_LegacyHidden,
+  unstable_Activity,
+  unstable_Scope,
+  unstable_SuspenseList,
+  unstable_TracingMarker,
+  unstable_getCacheForType,
+  unstable_useCacheRefresh,
+  useId,
+  useCallback,
+  useContext,
+  useDebugValue,
+  useDeferredValue,
+  useEffect,
+  experimental_useEffectEvent,
+  useImperativeHandle,
+  useInsertionEffect,
+  useLayoutEffect,
+  useMemo,
+  useOptimistic,
+  useSyncExternalStore,
+  useReducer,
+  useRef,
+  useState,
+  useTransition,
+  useActionState,
+  version,
+  act, // DEV-only
+  captureOwnerStack, // DEV-only
+} from './src/ReactClient';

packages/react/index.experimental.development.js

@@ -0,0 +1,72 @@
+/**
+ * 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,
+  Children,
+  Component,
+  Fragment,
+  Profiler,
+  PureComponent,
+  StrictMode,
+  Suspense,
+  cloneElement,
+  createContext,
+  createElement,
+  createRef,
+  use,
+  forwardRef,
+  isValidElement,
+  lazy,
+  memo,
+  cache,
+  startTransition,
+  unstable_DebugTracingMode,
+  unstable_Activity,
+  unstable_postpone,
+  unstable_getCacheForType,
+  unstable_SuspenseList,
+  unstable_useCacheRefresh,
+  useId,
+  useCallback,
+  useContext,
+  useDebugValue,
+  useDeferredValue,
+  useEffect,
+  experimental_useEffectEvent,
+  useImperativeHandle,
+  useInsertionEffect,
+  useLayoutEffect,
+  useMemo,
+  useOptimistic,
+  useReducer,
+  useRef,
+  useState,
+  useSyncExternalStore,
+  useTransition,
+  useActionState,
+  version,
+  act, // DEV-only
+  captureOwnerStack, // DEV-only
+} from './src/ReactClient';
+
+import {useOptimistic} from './src/ReactClient';
+
+export function experimental_useOptimistic<S, A>(
+  passthrough: S,
+  reducer: ?(S, A) => S,
+): [S, (A) => void] {
+  if (__DEV__) {
+    console.error(
+      'useOptimistic is now in canary. Remove the experimental_ prefix. ' +
+        'The prefixed alias will be removed in an upcoming release.',
+    );
+  }
+  return useOptimistic(passthrough, reducer);
+}

packages/react/index.experimental.js

@@ -9,7 +9,6 @@
 
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
-  act,
   Children,
   Component,
   Fragment,

packages/react/index.js

@@ -30,7 +30,6 @@ export type ChildrenArray<+T> = $ReadOnlyArray<ChildrenArray<T>> | T;
 // We can't use export * from in Flow for some reason.
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
-  act,
   Children,
   Component,
   Fragment,

packages/react/src/ReactClient.js

@@ -61,6 +61,7 @@ import {
 import ReactSharedInternals from './ReactSharedInternalsClient';
 import {startTransition} from './ReactStartTransition';
 import {act} from './ReactAct';
+import {captureOwnerStack} from './ReactOwnerStack';
 
 const Children = {
   map,
@@ -121,5 +122,6 @@ export {
   // enableTransitionTracing
   REACT_TRACING_MARKER_TYPE as unstable_TracingMarker,
   useId,
-  act,
+  act, // DEV-only
+  captureOwnerStack, // DEV-only
 };

packages/react/src/ReactOwnerStack.js

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) Meta Platforms, 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
+ */
+
+import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
+import ReactSharedInternals from 'shared/ReactSharedInternals';
+
+export function captureOwnerStack(): null | string {
+  if (!enableOwnerStacks || !__DEV__) {
+    return null;
+  }
+  const getCurrentStack = ReactSharedInternals.getCurrentStack;
+  if (getCurrentStack === null) {
+    return null;
+  }
+  // The current stack will be the owner stack if enableOwnerStacks is true
+  // which it is always here. Otherwise it's the parent stack.
+  return getCurrentStack(null);
+}

packages/react/src/ReactServer.experimental.development.js

@@ -0,0 +1,85 @@
+/**
+ * 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 {default as __SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './ReactSharedInternalsServer';
+
+import {forEach, map, count, toArray, only} from './ReactChildren';
+import {
+  REACT_FRAGMENT_TYPE,
+  REACT_PROFILER_TYPE,
+  REACT_STRICT_MODE_TYPE,
+  REACT_SUSPENSE_TYPE,
+  REACT_DEBUG_TRACING_MODE_TYPE,
+} from 'shared/ReactSymbols';
+import {
+  cloneElement,
+  createElement,
+  isValidElement,
+} from './jsx/ReactJSXElement';
+import {createRef} from './ReactCreateRef';
+import {
+  use,
+  useId,
+  useCallback,
+  useDebugValue,
+  useMemo,
+  useActionState,
+  getCacheForType,
+} from './ReactHooks';
+import {forwardRef} from './ReactForwardRef';
+import {lazy} from './ReactLazy';
+import {memo} from './ReactMemo';
+import {cache} from './ReactCacheServer';
+import {startTransition} from './ReactStartTransition';
+import {postpone} from './ReactPostpone';
+import {captureOwnerStack} from './ReactOwnerStack';
+import version from 'shared/ReactVersion';
+
+const Children = {
+  map,
+  forEach,
+  count,
+  toArray,
+  only,
+};
+
+// These are server-only
+export {
+  taintUniqueValue as experimental_taintUniqueValue,
+  taintObjectReference as experimental_taintObjectReference,
+} from './ReactTaint';
+
+export {
+  Children,
+  REACT_FRAGMENT_TYPE as Fragment,
+  REACT_PROFILER_TYPE as Profiler,
+  REACT_STRICT_MODE_TYPE as StrictMode,
+  REACT_SUSPENSE_TYPE as Suspense,
+  cloneElement,
+  createElement,
+  createRef,
+  use,
+  forwardRef,
+  isValidElement,
+  lazy,
+  memo,
+  cache,
+  startTransition,
+  REACT_DEBUG_TRACING_MODE_TYPE as unstable_DebugTracingMode,
+  REACT_SUSPENSE_TYPE as unstable_SuspenseList,
+  getCacheForType as unstable_getCacheForType,
+  postpone as unstable_postpone,
+  useId,
+  useCallback,
+  useDebugValue,
+  useMemo,
+  useActionState,
+  version,
+  captureOwnerStack, // DEV-only
+};

packages/react/src/ReactSharedInternalsClient.js

@@ -35,7 +35,7 @@ export type SharedStateClient = {
   thrownErrors: Array<mixed>,
 
   // ReactDebugCurrentFrame
-  getCurrentStack: null | ((stack: Error) => string),
+  getCurrentStack: null | ((stack: null | Error) => string),
 };
 
 export type RendererTask = boolean => RendererTask | null;
@@ -56,7 +56,7 @@ if (__DEV__) {
   // Stack implementation injected by the current renderer.
   ReactSharedInternals.getCurrentStack = (null:
     | null
-    | ((stack: Error) => string));
+    | ((stack: null | Error) => string));
 }
 
 export default ReactSharedInternals;