{"body":"","patch":"diff --git a\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js b\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js\nindex 2b93c8f06e..e245adcb13 100644\n--- a\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js\n+++ b\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js\n@@ -14,7 +14,6 @@ let React;\n let ReactTestRenderer;\n let ReactDebugTools;\n let act;\n-let assertConsoleErrorDev;\n let useMemoCache;\n \n function normalizeSourceLoc(tree) {\n@@ -34,7 +33,7 @@ describe('ReactHooksInspectionIntegration', () => {\n jest.resetModules();\n React = require('react');\n ReactTestRenderer = require('react-test-renderer');\n- ({act, assertConsoleErrorDev} = require('internal-test-utils'));\n+ ({act} = require('internal-test-utils'));\n ReactDebugTools = require('react-debug-tools');\n useMemoCache = require('react\/compiler-runtime').c;\n });\n@@ -2321,57 +2320,6 @@ describe('ReactHooksInspectionIntegration', () => {\n });\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('should support defaultProps and lazy', async () => {\n- const Suspense = React.Suspense;\n-\n- function Foo(props) {\n- const [value] = React.useState(props.defaultValue.slice(0, 3));\n- return

{value}<\/div>;\n- }\n- Foo.defaultProps = {\n- defaultValue: 'default',\n- };\n-\n- async function fakeImport(result) {\n- return {default: result};\n- }\n-\n- const LazyFoo = React.lazy(() => fakeImport(Foo));\n-\n- const renderer = ReactTestRenderer.create(\n- \n- \n- <\/Suspense>,\n- );\n-\n- await act(async () => await LazyFoo);\n- assertConsoleErrorDev([\n- 'Foo: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.',\n- ]);\n-\n- const childFiber = renderer.root._currentFiber();\n- const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n- expect(normalizeSourceLoc(tree)).toMatchInlineSnapshot(`\n- [\n- {\n- \"debugInfo\": null,\n- \"hookSource\": {\n- \"columnNumber\": 0,\n- \"fileName\": \"**\",\n- \"functionName\": \"Foo\",\n- \"lineNumber\": 0,\n- },\n- \"id\": 0,\n- \"isStateEditable\": true,\n- \"name\": \"State\",\n- \"subHooks\": [],\n- \"value\": \"def\",\n- },\n- ]\n- `);\n- });\n-\n \/\/ This test case is based on an open source bug report:\n \/\/ https:\/\/github.com\/facebookincubator\/redux-react-hook\/issues\/34#issuecomment-466693787\n it('should properly advance the current hook for useContext', async () => {\ndiff --git a\/packages\/react-dom\/src\/__tests__\/ReactDeprecationWarnings-test.js b\/packages\/react-dom\/src\/__tests__\/ReactDeprecationWarnings-test.js\ndeleted file mode 100644\nindex 523f1167ab..0000000000\n--- a\/packages\/react-dom\/src\/__tests__\/ReactDeprecationWarnings-test.js\n+++ \/dev\/null\n@@ -1,72 +0,0 @@\n-\/**\n- * Copyright (c) Meta Platforms, Inc. and affiliates.\n- *\n- * This source code is licensed under the MIT license found in the\n- * LICENSE file in the root directory of this source tree.\n- *\n- * @emails react-core\n- *\/\n-\n-'use strict';\n-\n-let React;\n-let ReactNoop;\n-let waitForAll;\n-let assertConsoleErrorDev;\n-\n-describe('ReactDeprecationWarnings', () => {\n- beforeEach(() => {\n- jest.resetModules();\n- React = require('react');\n- ReactNoop = require('react-noop-renderer');\n- const InternalTestUtils = require('internal-test-utils');\n- waitForAll = InternalTestUtils.waitForAll;\n- assertConsoleErrorDev = InternalTestUtils.assertConsoleErrorDev;\n- });\n-\n- \/\/ @gate !disableDefaultPropsExceptForClasses || !__DEV__\n- it('should warn when given defaultProps', async () => {\n- function FunctionalComponent(props) {\n- return null;\n- }\n-\n- FunctionalComponent.defaultProps = {\n- testProp: true,\n- };\n-\n- ReactNoop.render();\n- await waitForAll([]);\n- assertConsoleErrorDev([\n- 'FunctionalComponent: Support for defaultProps ' +\n- 'will be removed from function components in a future major ' +\n- 'release. Use JavaScript default parameters instead.\\n' +\n- ' in FunctionalComponent (at **)',\n- ]);\n- });\n-\n- \/\/ @gate !disableDefaultPropsExceptForClasses || !__DEV__\n- it('should warn when given defaultProps on a memoized function', async () => {\n- const MemoComponent = React.memo(function FunctionalComponent(props) {\n- return null;\n- });\n-\n- MemoComponent.defaultProps = {\n- testProp: true,\n- };\n-\n- ReactNoop.render(\n-

\n- \n- <\/div>,\n- );\n- await waitForAll([]);\n- assertConsoleErrorDev(\n- [\n- 'FunctionalComponent: Support for defaultProps ' +\n- 'will be removed from memo components in a future major ' +\n- 'release. Use JavaScript default parameters instead.',\n- ],\n- {withoutStack: true},\n- );\n- });\n-});\ndiff --git a\/packages\/react-dom\/src\/__tests__\/ReactFunctionComponent-test.js b\/packages\/react-dom\/src\/__tests__\/ReactFunctionComponent-test.js\nindex dc117f544c..80f9779fdd 100644\n--- a\/packages\/react-dom\/src\/__tests__\/ReactFunctionComponent-test.js\n+++ b\/packages\/react-dom\/src\/__tests__\/ReactFunctionComponent-test.js\n@@ -205,27 +205,6 @@ describe('ReactFunctionComponent', () => {\n ]);\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('should support default props', async () => {\n- function Child(props) {\n- return

{props.test}<\/div>;\n- }\n- Child.defaultProps = {test: 2};\n-\n- const container = document.createElement('div');\n- const root = ReactDOMClient.createRoot(container);\n-\n- await act(() => {\n- root.render();\n- });\n- expect(container.textContent).toBe('2');\n- assertConsoleErrorDev([\n- 'Child: Support for defaultProps will be removed from function components in a future major release. ' +\n- 'Use JavaScript default parameters instead.\\n' +\n- ' in Child (at **)',\n- ]);\n- });\n-\n \/\/ @gate !disableLegacyContext && !disableLegacyContextForFunctionComponents\n it('should receive context', async () => {\n class Parent extends React.Component {\ndiff --git a\/packages\/react-reconciler\/src\/ReactFiberBeginWork.js b\/packages\/react-reconciler\/src\/ReactFiberBeginWork.js\nindex c195e840e6..1b0b6b8d97 100644\n--- a\/packages\/react-reconciler\/src\/ReactFiberBeginWork.js\n+++ b\/packages\/react-reconciler\/src\/ReactFiberBeginWork.js\n@@ -117,7 +117,6 @@ import {\n enableCPUSuspense,\n enablePostpone,\n disableLegacyMode,\n- disableDefaultPropsExceptForClasses,\n enableHydrationLaneScheduling,\n enableViewTransition,\n enableFragmentRefs,\n@@ -258,7 +257,6 @@ import {\n updateClassInstance,\n resolveClassComponentProps,\n } from '.\/ReactFiberClassComponent';\n-import {resolveDefaultPropsOnNonClassComponent} from '.\/ReactFiberLazyComponent';\n import {\n createFiberFromTypeAndProps,\n createFiberFromFragment,\n@@ -327,7 +325,6 @@ let didWarnAboutGetDerivedStateOnFunctionComponent;\n export let didWarnAboutReassigningProps: boolean;\n let didWarnAboutRevealOrder;\n let didWarnAboutTailOptions;\n-let didWarnAboutDefaultPropsOnFunctionComponent;\n let didWarnAboutClassNameOnViewTransition;\n \n if (__DEV__) {\n@@ -338,7 +335,6 @@ if (__DEV__) {\n didWarnAboutReassigningProps = false;\n didWarnAboutRevealOrder = ({}: {[string]: boolean});\n didWarnAboutTailOptions = ({}: {[string]: boolean});\n- didWarnAboutDefaultPropsOnFunctionComponent = ({}: {[string]: boolean});\n didWarnAboutClassNameOnViewTransition = ({}: {[string]: boolean});\n }\n \n@@ -482,13 +478,7 @@ function updateMemoComponent(\n ): null | Fiber {\n if (current === null) {\n const type = Component.type;\n- if (\n- isSimpleFunctionComponent(type) &&\n- Component.compare === null &&\n- \/\/ SimpleMemoComponent codepath doesn't resolve outer props either.\n- (disableDefaultPropsExceptForClasses ||\n- Component.defaultProps === undefined)\n- ) {\n+ if (isSimpleFunctionComponent(type) && Component.compare === null) {\n let resolvedType = type;\n if (__DEV__) {\n resolvedType = resolveFunctionForHotReloading(type);\n@@ -509,21 +499,6 @@ function updateMemoComponent(\n renderLanes,\n );\n }\n- if (!disableDefaultPropsExceptForClasses) {\n- if (__DEV__) {\n- if (Component.defaultProps !== undefined) {\n- const componentName = getComponentNameFromType(type) || 'Unknown';\n- if (!didWarnAboutDefaultPropsOnFunctionComponent[componentName]) {\n- console.error(\n- '%s: Support for defaultProps will be removed from memo components ' +\n- 'in a future major release. Use JavaScript default parameters instead.',\n- componentName,\n- );\n- didWarnAboutDefaultPropsOnFunctionComponent[componentName] = true;\n- }\n- }\n- }\n- }\n const child = createFiberFromTypeAndProps(\n Component.type,\n null,\n@@ -2072,9 +2047,6 @@ function mountLazyComponent(\n renderLanes,\n );\n } else {\n- const resolvedProps = disableDefaultPropsExceptForClasses\n- ? props\n- : resolveDefaultPropsOnNonClassComponent(Component, props);\n workInProgress.tag = FunctionComponent;\n if (__DEV__) {\n validateFunctionComponentInDev(workInProgress, Component);\n@@ -2085,16 +2057,13 @@ function mountLazyComponent(\n null,\n workInProgress,\n Component,\n- resolvedProps,\n+ props,\n renderLanes,\n );\n }\n } else if (Component !== undefined && Component !== null) {\n const $$typeof = Component.$$typeof;\n if ($$typeof === REACT_FORWARD_REF_TYPE) {\n- const resolvedProps = disableDefaultPropsExceptForClasses\n- ? props\n- : resolveDefaultPropsOnNonClassComponent(Component, props);\n workInProgress.tag = ForwardRef;\n if (__DEV__) {\n workInProgress.type = Component =\n@@ -2104,24 +2073,16 @@ function mountLazyComponent(\n null,\n workInProgress,\n Component,\n- resolvedProps,\n+ props,\n renderLanes,\n );\n } else if ($$typeof === REACT_MEMO_TYPE) {\n- const resolvedProps = disableDefaultPropsExceptForClasses\n- ? props\n- : resolveDefaultPropsOnNonClassComponent(Component, props);\n workInProgress.tag = MemoComponent;\n return updateMemoComponent(\n null,\n workInProgress,\n Component,\n- disableDefaultPropsExceptForClasses\n- ? resolvedProps\n- : resolveDefaultPropsOnNonClassComponent(\n- Component.type,\n- resolvedProps,\n- ), \/\/ The inner type can have defaults too\n+ props,\n renderLanes,\n );\n }\n@@ -2198,22 +2159,6 @@ function validateFunctionComponentInDev(workInProgress: Fiber, Component: any) {\n );\n }\n \n- if (\n- !disableDefaultPropsExceptForClasses &&\n- Component.defaultProps !== undefined\n- ) {\n- const componentName = getComponentNameFromType(Component) || 'Unknown';\n-\n- if (!didWarnAboutDefaultPropsOnFunctionComponent[componentName]) {\n- console.error(\n- '%s: Support for defaultProps will be removed from function components ' +\n- 'in a future major release. Use JavaScript default parameters instead.',\n- componentName,\n- );\n- didWarnAboutDefaultPropsOnFunctionComponent[componentName] = true;\n- }\n- }\n-\n if (typeof Component.getDerivedStateFromProps === 'function') {\n const componentName = getComponentNameFromType(Component) || 'Unknown';\n \n@@ -4175,17 +4120,11 @@ function beginWork(\n }\n case FunctionComponent: {\n const Component = workInProgress.type;\n- const unresolvedProps = workInProgress.pendingProps;\n- const resolvedProps =\n- disableDefaultPropsExceptForClasses ||\n- workInProgress.elementType === Component\n- ? unresolvedProps\n- : resolveDefaultPropsOnNonClassComponent(Component, unresolvedProps);\n return updateFunctionComponent(\n current,\n workInProgress,\n Component,\n- resolvedProps,\n+ workInProgress.pendingProps,\n renderLanes,\n );\n }\n@@ -4226,18 +4165,11 @@ function beginWork(\n case HostPortal:\n return updatePortalComponent(current, workInProgress, renderLanes);\n case ForwardRef: {\n- const type = workInProgress.type;\n- const unresolvedProps = workInProgress.pendingProps;\n- const resolvedProps =\n- disableDefaultPropsExceptForClasses ||\n- workInProgress.elementType === type\n- ? unresolvedProps\n- : resolveDefaultPropsOnNonClassComponent(type, unresolvedProps);\n return updateForwardRef(\n current,\n workInProgress,\n- type,\n- resolvedProps,\n+ workInProgress.type,\n+ workInProgress.pendingProps,\n renderLanes,\n );\n }\n@@ -4252,20 +4184,11 @@ function beginWork(\n case ContextConsumer:\n return updateContextConsumer(current, workInProgress, renderLanes);\n case MemoComponent: {\n- const type = workInProgress.type;\n- const unresolvedProps = workInProgress.pendingProps;\n- \/\/ Resolve outer props first, then resolve inner props.\n- let resolvedProps = disableDefaultPropsExceptForClasses\n- ? unresolvedProps\n- : resolveDefaultPropsOnNonClassComponent(type, unresolvedProps);\n- resolvedProps = disableDefaultPropsExceptForClasses\n- ? resolvedProps\n- : resolveDefaultPropsOnNonClassComponent(type.type, resolvedProps);\n return updateMemoComponent(\n current,\n workInProgress,\n- type,\n- resolvedProps,\n+ workInProgress.type,\n+ workInProgress.pendingProps,\n renderLanes,\n );\n }\ndiff --git a\/packages\/react-reconciler\/src\/ReactFiberClassComponent.js b\/packages\/react-reconciler\/src\/ReactFiberClassComponent.js\nindex 7076c67883..7a9b443b3c 100644\n--- a\/packages\/react-reconciler\/src\/ReactFiberClassComponent.js\n+++ b\/packages\/react-reconciler\/src\/ReactFiberClassComponent.js\n@@ -20,7 +20,6 @@ import {\n import {\n disableLegacyContext,\n enableSchedulingProfiler,\n- disableDefaultPropsExceptForClasses,\n } from 'shared\/ReactFeatureFlags';\n import ReactStrictModeWarnings from '.\/ReactStrictModeWarnings';\n import {get as getInstance, set as setInstance} from 'shared\/ReactInstanceMap';\n@@ -1214,12 +1213,7 @@ export function resolveClassComponentProps(\n \n \/\/ Resolve default props.\n const defaultProps = Component.defaultProps;\n- if (\n- defaultProps &&\n- \/\/ If disableDefaultPropsExceptForClasses is true, we always resolve\n- \/\/ default props here in the reconciler, rather than in the JSX runtime.\n- (disableDefaultPropsExceptForClasses || !alreadyResolvedDefaultProps)\n- ) {\n+ if (defaultProps) {\n \/\/ We may have already copied the props object above to remove ref. If so,\n \/\/ we can modify that. Otherwise, copy the props object with Object.assign.\n if (newProps === baseProps) {\ndiff --git a\/packages\/react-reconciler\/src\/ReactFiberLazyComponent.js b\/packages\/react-reconciler\/src\/ReactFiberLazyComponent.js\ndeleted file mode 100644\nindex 36e16c2b40..0000000000\n--- a\/packages\/react-reconciler\/src\/ReactFiberLazyComponent.js\n+++ \/dev\/null\n@@ -1,34 +0,0 @@\n-\/**\n- * Copyright (c) Meta Platforms, Inc. and affiliates.\n- *\n- * This source code is licensed under the MIT license found in the\n- * LICENSE file in the root directory of this source tree.\n- *\n- * @flow\n- *\/\n-\n-import assign from 'shared\/assign';\n-import {disableDefaultPropsExceptForClasses} from 'shared\/ReactFeatureFlags';\n-\n-export function resolveDefaultPropsOnNonClassComponent(\n- Component: any,\n- baseProps: Object,\n-): Object {\n- if (disableDefaultPropsExceptForClasses) {\n- \/\/ Support for defaultProps is removed in React 19 for all types\n- \/\/ except classes.\n- return baseProps;\n- }\n- if (Component && Component.defaultProps) {\n- \/\/ Resolve default props. Taken from ReactElement\n- const props = assign({}, baseProps);\n- const defaultProps = Component.defaultProps;\n- for (const propName in defaultProps) {\n- if (props[propName] === undefined) {\n- props[propName] = defaultProps[propName];\n- }\n- }\n- return props;\n- }\n- return baseProps;\n-}\ndiff --git a\/packages\/react-reconciler\/src\/ReactFiberWorkLoop.js b\/packages\/react-reconciler\/src\/ReactFiberWorkLoop.js\nindex a8b5dfadeb..1107c5bd46 100644\n--- a\/packages\/react-reconciler\/src\/ReactFiberWorkLoop.js\n+++ b\/packages\/react-reconciler\/src\/ReactFiberWorkLoop.js\n@@ -46,7 +46,6 @@ import {\n alwaysThrottleRetries,\n enableInfiniteRenderLoopDetection,\n disableLegacyMode,\n- disableDefaultPropsExceptForClasses,\n enableComponentPerformanceTrack,\n enableYieldingBeforePassive,\n enableThrottledScheduling,\n@@ -349,7 +348,6 @@ import {\n getSuspenseHandler,\n getShellBoundary,\n } from '.\/ReactFiberSuspenseContext';\n-import {resolveDefaultPropsOnNonClassComponent} from '.\/ReactFiberLazyComponent';\n import {resetChildReconcilerOnUnwind} from '.\/ReactChildFiber';\n import {\n ensureRootIsScheduled,\n@@ -2858,12 +2856,6 @@ function replayBeginWork(unitOfWork: Fiber): null | Fiber {\n \/\/ could maybe use this as an opportunity to say `use` doesn't work with\n \/\/ `defaultProps` :)\n const Component = unitOfWork.type;\n- const unresolvedProps = unitOfWork.pendingProps;\n- const resolvedProps =\n- disableDefaultPropsExceptForClasses ||\n- unitOfWork.elementType === Component\n- ? unresolvedProps\n- : resolveDefaultPropsOnNonClassComponent(Component, unresolvedProps);\n let context: any;\n if (!disableLegacyContext) {\n const unmaskedContext = getUnmaskedContext(unitOfWork, Component, true);\n@@ -2872,7 +2864,7 @@ function replayBeginWork(unitOfWork: Fiber): null | Fiber {\n next = replayFunctionComponent(\n current,\n unitOfWork,\n- resolvedProps,\n+ unitOfWork.pendingProps,\n Component,\n context,\n workInProgressRootRenderLanes,\n@@ -2885,17 +2877,10 @@ function replayBeginWork(unitOfWork: Fiber): null | Fiber {\n \/\/ could maybe use this as an opportunity to say `use` doesn't work with\n \/\/ `defaultProps` :)\n const Component = unitOfWork.type.render;\n- const unresolvedProps = unitOfWork.pendingProps;\n- const resolvedProps =\n- disableDefaultPropsExceptForClasses ||\n- unitOfWork.elementType === Component\n- ? unresolvedProps\n- : resolveDefaultPropsOnNonClassComponent(Component, unresolvedProps);\n-\n next = replayFunctionComponent(\n current,\n unitOfWork,\n- resolvedProps,\n+ unitOfWork.pendingProps,\n Component,\n unitOfWork.ref,\n workInProgressRootRenderLanes,\ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js b\/packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js\nindex b6ae8e2ba1..27404eee5e 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js\n@@ -701,64 +701,6 @@ describe('ReactLazy', () => {\n expect(root).toMatchRenderedOutput('A3');\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('resolves defaultProps on the outer wrapper but warns', async () => {\n- function T(props) {\n- Scheduler.log(props.inner + ' ' + props.outer);\n- return props.inner + ' ' + props.outer;\n- }\n- T.defaultProps = {inner: 'Hi'};\n- const LazyText = lazy(() => fakeImport(T));\n- LazyText.defaultProps = {outer: 'Bye'};\n- assertConsoleErrorDev(\n- [\n- 'It is not supported to assign `defaultProps` to ' +\n- 'a lazy component import. Either specify them where the component ' +\n- 'is defined, or create a wrapping component around it.',\n- ],\n- {withoutStack: true},\n- );\n-\n- const root = ReactTestRenderer.create(\n- }>\n- \n- <\/Suspense>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n-\n- await waitForAll(['Loading...']);\n- expect(root).not.toMatchRenderedOutput('Hi Bye');\n-\n- await act(() => resolveFakeImport(T));\n- assertLog(['Hi Bye']);\n- assertConsoleErrorDev([\n- 'T: Support for defaultProps ' +\n- 'will be removed from function components in a future major ' +\n- 'release. Use JavaScript default parameters instead.\\n' +\n- ' in T (at **)',\n- ]);\n-\n- expect(root).toMatchRenderedOutput('Hi Bye');\n-\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll(['Hi World']);\n- expect(root).toMatchRenderedOutput('Hi World');\n-\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll(['Friends Bye']);\n- expect(root).toMatchRenderedOutput('Friends Bye');\n- });\n-\n it('throws with a useful error when wrapping invalid type with lazy()', async () => {\n const BadLazy = lazy(() => fakeImport(42));\n \n@@ -1112,48 +1054,6 @@ describe('ReactLazy', () => {\n );\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('resolves props for function component with defaultProps', async () => {\n- function Add(props) {\n- expect(props.innerWithDefault).toBe(42);\n- return props.inner + props.outer;\n- }\n- Add.defaultProps = {\n- innerWithDefault: 42,\n- };\n- const LazyAdd = lazy(() => fakeImport(Add));\n- const root = ReactTestRenderer.create(\n- }>\n- \n- <\/Suspense>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n-\n- await waitForAll(['Loading...']);\n- expect(root).not.toMatchRenderedOutput('22');\n-\n- \/\/ Mount\n- await act(() => resolveFakeImport(Add));\n-\n- assertConsoleErrorDev([\n- 'Add: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.\\n' +\n- ' in Add (at **)',\n- ]);\n-\n- expect(root).toMatchRenderedOutput('22');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('0');\n- });\n-\n it('resolves props for function component without defaultProps', async () => {\n function Add(props) {\n return props.inner + props.outer;\n@@ -1258,44 +1158,6 @@ describe('ReactLazy', () => {\n expect(root).toMatchRenderedOutput('0');\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('resolves props for forwardRef component with defaultProps', async () => {\n- const Add = React.forwardRef((props, ref) => {\n- expect(props.innerWithDefault).toBe(42);\n- return props.inner + props.outer;\n- });\n- Add.displayName = 'Add';\n- Add.defaultProps = {\n- innerWithDefault: 42,\n- };\n- const LazyAdd = lazy(() => fakeImport(Add));\n- const root = ReactTestRenderer.create(\n- }>\n- \n- <\/Suspense>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n-\n- await waitForAll(['Loading...']);\n- expect(root).not.toMatchRenderedOutput('22');\n-\n- \/\/ Mount\n- await act(() => resolveFakeImport(Add));\n-\n- expect(root).toMatchRenderedOutput('22');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('0');\n- });\n-\n it('resolves props for forwardRef component without defaultProps', async () => {\n const Add = React.forwardRef((props, ref) => {\n return props.inner + props.outer;\n@@ -1330,51 +1192,6 @@ describe('ReactLazy', () => {\n expect(root).toMatchRenderedOutput('0');\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('resolves props for outer memo component with defaultProps', async () => {\n- let Add = props => {\n- expect(props.innerWithDefault).toBe(42);\n- return props.inner + props.outer;\n- };\n- Add = React.memo(Add);\n- Add.defaultProps = {\n- innerWithDefault: 42,\n- };\n- const LazyAdd = lazy(() => fakeImport(Add));\n- const root = ReactTestRenderer.create(\n- }>\n- \n- <\/Suspense>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n-\n- await waitForAll(['Loading...']);\n- expect(root).not.toMatchRenderedOutput('22');\n-\n- \/\/ Mount\n- await act(() => resolveFakeImport(Add));\n-\n- assertConsoleErrorDev(\n- [\n- 'Add: Support for defaultProps will be removed from memo components in a future major release. Use JavaScript default parameters instead.',\n- ],\n- {withoutStack: true},\n- );\n-\n- expect(root).toMatchRenderedOutput('22');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('0');\n- });\n-\n it('resolves props for outer memo component without defaultProps', async () => {\n let Add = props => {\n return props.inner + props.outer;\n@@ -1408,52 +1225,6 @@ describe('ReactLazy', () => {\n expect(root).toMatchRenderedOutput('0');\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('resolves props for inner memo component with defaultProps', async () => {\n- const Add = props => {\n- expect(props.innerWithDefault).toBe(42);\n- return props.inner + props.outer;\n- };\n- Add.displayName = 'Add';\n- Add.defaultProps = {\n- innerWithDefault: 42,\n- };\n- const MemoAdd = React.memo(Add);\n- const LazyAdd = lazy(() => fakeImport(MemoAdd));\n- const root = ReactTestRenderer.create(\n- }>\n- \n- <\/Suspense>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n-\n- await waitForAll(['Loading...']);\n- expect(root).not.toMatchRenderedOutput('22');\n-\n- \/\/ Mount\n- await act(() => resolveFakeImport(MemoAdd));\n-\n- assertConsoleErrorDev(\n- [\n- 'Add: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.',\n- ],\n- {withoutStack: true},\n- );\n-\n- expect(root).toMatchRenderedOutput('22');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('0');\n- });\n-\n it('resolves props for inner memo component without defaultProps', async () => {\n const Add = props => {\n return props.inner + props.outer;\n@@ -1487,50 +1258,6 @@ describe('ReactLazy', () => {\n expect(root).toMatchRenderedOutput('0');\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('uses outer resolved props on memo', async () => {\n- let T = props => {\n- return ;\n- };\n- T.defaultProps = {\n- text: 'Inner default text',\n- };\n- T = React.memo(T);\n- const LazyText = lazy(() => fakeImport(T));\n- const root = ReactTestRenderer.create(\n- }>\n- \n- <\/Suspense>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n-\n- await waitForAll(['Loading...']);\n- expect(root).not.toMatchRenderedOutput('Inner default text');\n-\n- \/\/ Mount\n- await act(() => resolveFakeImport(T));\n- assertLog(['Inner default text']);\n- assertConsoleErrorDev(\n- [\n- 'T: Support for defaultProps will be removed from function components in a future major release. ' +\n- 'Use JavaScript default parameters instead.',\n- ],\n- {withoutStack: true},\n- );\n- expect(root).toMatchRenderedOutput('Inner default text');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([null]);\n- expect(root).toMatchRenderedOutput(null);\n- });\n-\n it('includes lazy-loaded component in warning stack', async () => {\n const Foo = props =>

{[, ]}<\/div>;\n const LazyFoo = lazy(() => {\n@@ -1614,150 +1341,6 @@ describe('ReactLazy', () => {\n expect(ref.current).not.toBe(null);\n });\n \n- \/\/ Regression test for #14310\n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('supports defaultProps defined on the memo() return value', async () => {\n- const Add = React.memo(props => {\n- return props.inner + props.outer;\n- });\n- Add.defaultProps = {\n- inner: 2,\n- };\n- const LazyAdd = lazy(() => fakeImport(Add));\n- const root = ReactTestRenderer.create(\n- }>\n- \n- <\/Suspense>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n- await waitForAll(['Loading...']);\n- expect(root).not.toMatchRenderedOutput('4');\n-\n- \/\/ Mount\n- await act(() => resolveFakeImport(Add));\n- assertConsoleErrorDev(\n- [\n- 'Unknown: Support for defaultProps will be removed from memo components in a future major release. ' +\n- 'Use JavaScript default parameters instead.',\n- ],\n- {withoutStack: true},\n- );\n- expect(root).toMatchRenderedOutput('4');\n-\n- \/\/ Update (shallowly equal)\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('4');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('5');\n-\n- \/\/ Update (shallowly equal)\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('5');\n-\n- \/\/ Update (explicit props)\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('2');\n-\n- \/\/ Update (explicit props, shallowly equal)\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('2');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('3');\n- });\n-\n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('merges defaultProps in the correct order', async () => {\n- let Add = React.memo(props => {\n- return props.inner + props.outer;\n- });\n- Add.defaultProps = {\n- inner: 100,\n- };\n- Add = React.memo(Add);\n- Add.defaultProps = {\n- inner: 2,\n- outer: 0,\n- };\n- const LazyAdd = lazy(() => fakeImport(Add));\n- const root = ReactTestRenderer.create(\n- }>\n- \n- <\/Suspense>,\n- {\n- unstable_isConcurrent: true,\n- },\n- );\n- await waitForAll(['Loading...']);\n- expect(root).not.toMatchRenderedOutput('4');\n-\n- \/\/ Mount\n- await act(() => resolveFakeImport(Add));\n- assertConsoleErrorDev(\n- [\n- 'Memo: Support for defaultProps will be removed from memo components in a future major release. ' +\n- 'Use JavaScript default parameters instead.',\n- 'Unknown: Support for defaultProps will be removed from memo components in a future major release. ' +\n- 'Use JavaScript default parameters instead.',\n- ],\n- {withoutStack: true},\n- );\n- expect(root).toMatchRenderedOutput('4');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('5');\n-\n- \/\/ Update\n- root.update(\n- }>\n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(root).toMatchRenderedOutput('2');\n- });\n-\n it('should error with a component stack naming the resolved component', async () => {\n let componentStackMessage;\n \ndiff --git a\/packages\/react-reconciler\/src\/__tests__\/ReactMemo-test.js b\/packages\/react-reconciler\/src\/__tests__\/ReactMemo-test.js\nindex 02f5e6ef18..e96dc72e6a 100644\n--- a\/packages\/react-reconciler\/src\/__tests__\/ReactMemo-test.js\n+++ b\/packages\/react-reconciler\/src\/__tests__\/ReactMemo-test.js\n@@ -373,77 +373,6 @@ describe('memo', () => {\n expect(ReactNoop).toMatchRenderedOutput();\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('supports defaultProps defined on the memo() return value', async () => {\n- function Counter({a, b, c, d, e}) {\n- return ;\n- }\n- Counter.defaultProps = {\n- a: 1,\n- };\n- \/\/ Note! We intentionally use React.memo() rather than the injected memo().\n- \/\/ This tests a synchronous chain of React.memo() without lazy() in the middle.\n- Counter = React.memo(Counter);\n- Counter.defaultProps = {\n- b: 2,\n- };\n- Counter = React.memo(Counter);\n- Counter = React.memo(Counter); \/\/ Layer without defaultProps\n- Counter.defaultProps = {\n- c: 3,\n- };\n- Counter = React.memo(Counter);\n- Counter.defaultProps = {\n- d: 4,\n- };\n- \/\/ The final layer uses memo() from test fixture (which might be lazy).\n- Counter = memo(Counter);\n-\n- await act(() => {\n- ReactNoop.render(\n- }>\n- \n- <\/Suspense>,\n- );\n- });\n- assertLog(['Loading...', 15]);\n- if (label === 'lazy') {\n- assertConsoleErrorDev(\n- [\n- 'Counter: Support for defaultProps will be removed from memo components in a future major release. ' +\n- 'Use JavaScript default parameters instead.',\n- ],\n- {withoutStack: true},\n- );\n- } else {\n- assertConsoleErrorDev([\n- 'Counter: Support for defaultProps will be removed from memo components in a future major release. ' +\n- 'Use JavaScript default parameters instead.\\n' +\n- ' in Indirection (at **)',\n- ]);\n- }\n-\n- expect(ReactNoop).toMatchRenderedOutput();\n-\n- \/\/ Should bail out because props have not changed\n- ReactNoop.render(\n- \n- \n- <\/Suspense>,\n- );\n- await waitForAll([]);\n- expect(ReactNoop).toMatchRenderedOutput();\n-\n- \/\/ Should update because count prop changed\n- ReactNoop.render(\n- \n- \n- <\/Suspense>,\n- );\n- await waitForAll([20]);\n- expect(ReactNoop).toMatchRenderedOutput();\n- });\n-\n it('warns if the first argument is undefined', () => {\n memo();\n assertConsoleErrorDev(\n@@ -466,46 +395,6 @@ describe('memo', () => {\n );\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('handles nested defaultProps declarations', async () => {\n- function Inner(props) {\n- return props.inner + props.middle + props.outer;\n- }\n- Inner.defaultProps = {inner: 1};\n- const Middle = React.memo(Inner);\n- Middle.defaultProps = {middle: 10};\n- const Outer = React.memo(Middle);\n- Outer.defaultProps = {outer: 100};\n-\n- const root = ReactNoop.createRoot();\n- await act(() => {\n- root.render(\n-

\n- \n- <\/div>,\n- );\n- });\n- assertConsoleErrorDev(\n- [\n- 'Inner: ' +\n- 'Support for defaultProps will be removed from memo components in a future major release. ' +\n- 'Use JavaScript default parameters instead.',\n- ],\n- {withoutStack: true},\n- );\n- expect(root).toMatchRenderedOutput(

111<\/div>);\n-\n- await act(async () => {\n- root.render(\n-

\n- \n- <\/div>,\n- );\n- await waitForAll([]);\n- });\n- expect(root).toMatchRenderedOutput(

234<\/div>);\n- });\n-\n it('does not drop lower priority state updates when bailing out at higher pri (simple)', async () => {\n const {useState} = React;\n \ndiff --git a\/packages\/react-server\/src\/ReactFizzServer.js b\/packages\/react-server\/src\/ReactFizzServer.js\nindex dd924d18db..7f01c5933c 100644\n--- a\/packages\/react-server\/src\/ReactFizzServer.js\n+++ b\/packages\/react-server\/src\/ReactFizzServer.js\n@@ -178,7 +178,6 @@ import {\n enableScopeAPI,\n enablePostpone,\n enableHalt,\n- disableDefaultPropsExceptForClasses,\n enableAsyncIterableChildren,\n enableViewTransition,\n enableFizzBlockingRender,\n@@ -2399,12 +2398,7 @@ export function resolveClassComponentProps(\n \n \/\/ Resolve default props.\n const defaultProps = Component.defaultProps;\n- if (\n- defaultProps &&\n- \/\/ If disableDefaultPropsExceptForClasses is true, we always resolve\n- \/\/ default props here, rather than in the JSX runtime.\n- disableDefaultPropsExceptForClasses\n- ) {\n+ if (defaultProps) {\n \/\/ We may have already copied the props object above to remove ref. If so,\n \/\/ we can modify that. Otherwise, copy the props object with Object.assign.\n if (newProps === baseProps) {\n@@ -2453,7 +2447,6 @@ const didWarnAboutContextTypes: {[string]: boolean} = {};\n const didWarnAboutContextTypeOnFunctionComponent: {[string]: boolean} = {};\n const didWarnAboutGetDerivedStateOnFunctionComponent: {[string]: boolean} = {};\n let didWarnAboutReassigningProps = false;\n-const didWarnAboutDefaultPropsOnFunctionComponent: {[string]: boolean} = {};\n let didWarnAboutGenerators = false;\n let didWarnAboutMaps = false;\n \n@@ -2610,22 +2603,6 @@ function validateFunctionComponentInDev(Component: any): void {\n );\n }\n \n- if (\n- !disableDefaultPropsExceptForClasses &&\n- Component.defaultProps !== undefined\n- ) {\n- const componentName = getComponentNameFromType(Component) || 'Unknown';\n-\n- if (!didWarnAboutDefaultPropsOnFunctionComponent[componentName]) {\n- console.error(\n- '%s: Support for defaultProps will be removed from function components ' +\n- 'in a future major release. Use JavaScript default parameters instead.',\n- componentName,\n- );\n- didWarnAboutDefaultPropsOnFunctionComponent[componentName] = true;\n- }\n- }\n-\n if (typeof Component.getDerivedStateFromProps === 'function') {\n const componentName = getComponentNameFromType(Component) || 'Unknown';\n \n@@ -2655,29 +2632,6 @@ function validateFunctionComponentInDev(Component: any): void {\n }\n }\n \n-function resolveDefaultPropsOnNonClassComponent(\n- Component: any,\n- baseProps: Object,\n-): Object {\n- if (disableDefaultPropsExceptForClasses) {\n- \/\/ Support for defaultProps is removed in React 19 for all types\n- \/\/ except classes.\n- return baseProps;\n- }\n- if (Component && Component.defaultProps) {\n- \/\/ Resolve default props. Taken from ReactElement\n- const props = assign({}, baseProps);\n- const defaultProps = Component.defaultProps;\n- for (const propName in defaultProps) {\n- if (props[propName] === undefined) {\n- props[propName] = defaultProps[propName];\n- }\n- }\n- return props;\n- }\n- return baseProps;\n-}\n-\n function renderForwardRef(\n request: Request,\n task: Task,\n@@ -2735,11 +2689,7 @@ function renderMemo(\n ref: any,\n ): void {\n const innerType = type.type;\n- const resolvedProps = resolveDefaultPropsOnNonClassComponent(\n- innerType,\n- props,\n- );\n- renderElement(request, task, keyPath, innerType, resolvedProps, ref);\n+ renderElement(request, task, keyPath, innerType, props, ref);\n }\n \n function renderContextConsumer(\n@@ -2819,11 +2769,7 @@ function renderLazyComponent(\n \/\/ eslint-disable-next-line no-throw-literal\n throw null;\n }\n- const resolvedProps = resolveDefaultPropsOnNonClassComponent(\n- Component,\n- props,\n- );\n- renderElement(request, task, keyPath, Component, resolvedProps, ref);\n+ renderElement(request, task, keyPath, Component, props, ref);\n }\n \n function renderActivity(\ndiff --git a\/packages\/react\/src\/ReactLazy.js b\/packages\/react\/src\/ReactLazy.js\nindex d1d1088aae..2ac29c8777 100644\n--- a\/packages\/react\/src\/ReactLazy.js\n+++ b\/packages\/react\/src\/ReactLazy.js\n@@ -10,7 +10,6 @@\n import type {Wakeable, Thenable, ReactDebugInfo} from 'shared\/ReactTypes';\n \n import {REACT_LAZY_TYPE} from 'shared\/ReactSymbols';\n-import {disableDefaultPropsExceptForClasses} from 'shared\/ReactFeatureFlags';\n \n const Uninitialized = -1;\n const Pending = 0;\n@@ -141,35 +140,5 @@ export function lazy(\n _init: lazyInitializer,\n };\n \n- if (!disableDefaultPropsExceptForClasses) {\n- if (__DEV__) {\n- \/\/ In production, this would just set it on the object.\n- let defaultProps;\n- \/\/ $FlowFixMe[prop-missing]\n- Object.defineProperties(lazyType, {\n- defaultProps: {\n- configurable: true,\n- get() {\n- return defaultProps;\n- },\n- \/\/ $FlowFixMe[missing-local-annot]\n- set(newDefaultProps) {\n- console.error(\n- 'It is not supported to assign `defaultProps` to ' +\n- 'a lazy component import. Either specify them where the component ' +\n- 'is defined, or create a wrapping component around it.',\n- );\n- defaultProps = newDefaultProps;\n- \/\/ Match production behavior more closely:\n- \/\/ $FlowFixMe[prop-missing]\n- Object.defineProperty(lazyType, 'defaultProps', {\n- enumerable: true,\n- });\n- },\n- },\n- });\n- }\n- }\n-\n return lazyType;\n }\ndiff --git a\/packages\/react\/src\/__tests__\/ReactElementClone-test.js b\/packages\/react\/src\/__tests__\/ReactElementClone-test.js\nindex b2e791f826..81da2a6f39 100644\n--- a\/packages\/react\/src\/__tests__\/ReactElementClone-test.js\n+++ b\/packages\/react\/src\/__tests__\/ReactElementClone-test.js\n@@ -291,28 +291,6 @@ describe('ReactElementClone', () => {\n );\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('should normalize props with default values', () => {\n- class Component extends React.Component {\n- render() {\n- return ;\n- }\n- }\n- Component.defaultProps = {prop: 'testKey'};\n-\n- const instance = React.createElement(Component);\n- const clonedInstance = React.cloneElement(instance, {prop: undefined});\n- expect(clonedInstance.props.prop).toBe('testKey');\n- const clonedInstance2 = React.cloneElement(instance, {prop: null});\n- expect(clonedInstance2.props.prop).toBe(null);\n-\n- const instance2 = React.createElement(Component, {prop: 'newTestKey'});\n- const cloneInstance3 = React.cloneElement(instance2, {prop: undefined});\n- expect(cloneInstance3.props.prop).toBe('testKey');\n- const cloneInstance4 = React.cloneElement(instance2, {});\n- expect(cloneInstance4.props.prop).toBe('newTestKey');\n- });\n-\n it('warns for keys for arrays of elements in rest args', async () => {\n const root = ReactDOMClient.createRoot(document.createElement('div'));\n await act(() => {\ndiff --git a\/packages\/react\/src\/__tests__\/forwardRef-test.js b\/packages\/react\/src\/__tests__\/forwardRef-test.js\nindex aa151fc6d1..b163ac0025 100644\n--- a\/packages\/react\/src\/__tests__\/forwardRef-test.js\n+++ b\/packages\/react\/src\/__tests__\/forwardRef-test.js\n@@ -76,45 +76,6 @@ describe('forwardRef', () => {\n expect(ref.current).toBe(null);\n });\n \n- \/\/ @gate !disableDefaultPropsExceptForClasses\n- it('should support defaultProps', async () => {\n- function FunctionComponent({forwardedRef, optional, required}) {\n- return (\n-

\n- {optional}\n- {required}\n- <\/div>\n- );\n- }\n-\n- const RefForwardingComponent = React.forwardRef(\n- function NamedFunction(props, ref) {\n- return ;\n- },\n- );\n- RefForwardingComponent.defaultProps = {\n- optional: 'default',\n- };\n-\n- const ref = React.createRef();\n-\n- ReactNoop.render(\n- ,\n- );\n- await waitForAll([]);\n- expect(ref.current.children).toEqual([\n- {text: 'foo', hidden: false},\n- {text: 'bar', hidden: false},\n- ]);\n-\n- ReactNoop.render();\n- await waitForAll([]);\n- expect(ref.current.children).toEqual([\n- {text: 'default', hidden: false},\n- {text: 'foo', hidden: false},\n- ]);\n- });\n-\n it('should warn if not provided a callback during creation', () => {\n React.forwardRef(undefined);\n assertConsoleErrorDev(\ndiff --git a\/packages\/react\/src\/jsx\/ReactJSXElement.js b\/packages\/react\/src\/jsx\/ReactJSXElement.js\nindex 68c553ab9f..6a562ba5e8 100644\n--- a\/packages\/react\/src\/jsx\/ReactJSXElement.js\n+++ b\/packages\/react\/src\/jsx\/ReactJSXElement.js\n@@ -16,10 +16,7 @@ import {\n } from 'shared\/ReactSymbols';\n import {checkKeyStringCoercion} from 'shared\/CheckStringCoercion';\n import isArray from 'shared\/isArray';\n-import {\n- disableDefaultPropsExceptForClasses,\n- ownerStackLimit,\n-} from 'shared\/ReactFeatureFlags';\n+import {ownerStackLimit} from 'shared\/ReactFeatureFlags';\n \n const createTask =\n \/\/ eslint-disable-next-line react-internal\/no-production-logging\n@@ -351,18 +348,6 @@ export function jsxProd(type, config, maybeKey) {\n }\n }\n \n- if (!disableDefaultPropsExceptForClasses) {\n- \/\/ Resolve default props\n- if (type && type.defaultProps) {\n- const defaultProps = type.defaultProps;\n- for (const propName in defaultProps) {\n- if (props[propName] === undefined) {\n- props[propName] = defaultProps[propName];\n- }\n- }\n- }\n- }\n-\n return ReactElement(\n type,\n key,\n@@ -598,18 +583,6 @@ function jsxDEVImpl(\n }\n }\n \n- if (!disableDefaultPropsExceptForClasses) {\n- \/\/ Resolve default props\n- if (type && type.defaultProps) {\n- const defaultProps = type.defaultProps;\n- for (const propName in defaultProps) {\n- if (props[propName] === undefined) {\n- props[propName] = defaultProps[propName];\n- }\n- }\n- }\n- }\n-\n if (key) {\n const displayName =\n typeof type === 'function'\n@@ -817,14 +790,6 @@ export function cloneElement(element, config, children) {\n }\n \n \/\/ Remaining properties override existing props\n- let defaultProps;\n- if (\n- !disableDefaultPropsExceptForClasses &&\n- element.type &&\n- element.type.defaultProps\n- ) {\n- defaultProps = element.type.defaultProps;\n- }\n for (propName in config) {\n if (\n hasOwnProperty.call(config, propName) &&\n@@ -843,16 +808,7 @@ export function cloneElement(element, config, children) {\n \/\/ backwards compatibility.\n !(propName === 'ref' && config.ref === undefined)\n ) {\n- if (\n- !disableDefaultPropsExceptForClasses &&\n- config[propName] === undefined &&\n- defaultProps !== undefined\n- ) {\n- \/\/ Resolve default props\n- props[propName] = defaultProps[propName];\n- } else {\n- props[propName] = config[propName];\n- }\n+ props[propName] = config[propName];\n }\n }\n }\ndiff --git a\/packages\/shared\/ReactFeatureFlags.js b\/packages\/shared\/ReactFeatureFlags.js\nindex a56cc2582e..e247562b69 100644\n--- a\/packages\/shared\/ReactFeatureFlags.js\n+++ b\/packages\/shared\/ReactFeatureFlags.js\n@@ -37,9 +37,6 @@ export const favorSafetyOverHydrationPerf = true;\n \/\/ Need to remove didTimeout argument from Scheduler before landing\n export const disableSchedulerTimeoutInWorkLoop = false;\n \n-\/\/ TODO: Land at Meta before removing.\n-export const disableDefaultPropsExceptForClasses = true;\n-\n \/\/ -----------------------------------------------------------------------------\n \/\/ Slated for removal in the future (significant effort)\n \/\/\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.native-fb.js b\/packages\/shared\/forks\/ReactFeatureFlags.native-fb.js\nindex 09f6b62983..0c66227183 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.native-fb.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.native-fb.js\n@@ -33,7 +33,6 @@ export const {\n \/\/ The rest of the flags are static for better dead code elimination.\n export const disableClientCache = true;\n export const disableCommentsAsDOMContainers = true;\n-export const disableDefaultPropsExceptForClasses = true;\n export const disableInputAttributeSyncing = false;\n export const disableLegacyContext = false;\n export const disableLegacyContextForFunctionComponents = false;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.native-oss.js b\/packages\/shared\/forks\/ReactFeatureFlags.native-oss.js\nindex 6893a3215b..ed372097cb 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.native-oss.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.native-oss.js\n@@ -18,7 +18,6 @@ import typeof * as ExportsType from '.\/ReactFeatureFlags.native-oss';\n export const alwaysThrottleRetries = false;\n export const disableClientCache = true;\n export const disableCommentsAsDOMContainers = true;\n-export const disableDefaultPropsExceptForClasses = true;\n export const disableInputAttributeSyncing = false;\n export const disableLegacyContext = true;\n export const disableLegacyContextForFunctionComponents = true;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js\nindex c0a909ba5c..66514e7697 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js\n@@ -89,7 +89,6 @@ export const disableLegacyMode = true;\n export const disableLegacyContext = true;\n export const disableLegacyContextForFunctionComponents = true;\n export const enableReactTestRendererWarning = true;\n-export const disableDefaultPropsExceptForClasses = true;\n \n export const enableObjectFiber = false;\n \ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js\nindex 209fbd4b8c..ef912457ef 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js\n@@ -63,8 +63,6 @@ export const enableInfiniteRenderLoopDetection = false;\n export const enableReactTestRendererWarning = false;\n export const disableLegacyMode = true;\n \n-export const disableDefaultPropsExceptForClasses = true;\n-\n export const renameElementSymbol = false;\n \n export const enableObjectFiber = false;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js b\/packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js\nindex eeccf763ca..2f4da5916e 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js\n@@ -14,7 +14,6 @@\n \/\/ with the __VARIANT__ set to `true`, and once set to `false`.\n \n export const alwaysThrottleRetries = __VARIANT__;\n-export const disableDefaultPropsExceptForClasses = __VARIANT__;\n export const disableLegacyContextForFunctionComponents = __VARIANT__;\n export const disableSchedulerTimeoutInWorkLoop = __VARIANT__;\n export const enableHiddenSubtreeInsertionEffectCleanup = __VARIANT__;\ndiff --git a\/packages\/shared\/forks\/ReactFeatureFlags.www.js b\/packages\/shared\/forks\/ReactFeatureFlags.www.js\nindex 29bb652fd7..4acdf65a92 100644\n--- a\/packages\/shared\/forks\/ReactFeatureFlags.www.js\n+++ b\/packages\/shared\/forks\/ReactFeatureFlags.www.js\n@@ -16,7 +16,6 @@ const dynamicFeatureFlags: DynamicFeatureFlags = require('ReactFeatureFlags');\n \n export const {\n alwaysThrottleRetries,\n- disableDefaultPropsExceptForClasses,\n disableLegacyContextForFunctionComponents,\n disableSchedulerTimeoutInWorkLoop,\n enableHiddenSubtreeInsertionEffectCleanup,\n","commit":{"revision":"602917c8cb521e6f9b8eae7070985e2a698fc0d0","shortRevision":"602917c8cb","authorName":"Jan Kassens","authorEmail":"jkassens@meta.com","authoredAt":"2025-07-01T15:52:56-04:00","subject":"Cleanup disableDefaultPropsExceptForClasses flag (#33648)"},"files":[{"path":"packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js","status":"M"},{"path":"packages\/react-dom\/src\/__tests__\/ReactDeprecationWarnings-test.js","status":"D"},{"path":"packages\/react-dom\/src\/__tests__\/ReactFunctionComponent-test.js","status":"M"},{"path":"packages\/react-reconciler\/src\/ReactFiberBeginWork.js","status":"M"},{"path":"packages\/react-reconciler\/src\/ReactFiberClassComponent.js","status":"M"},{"path":"packages\/react-reconciler\/src\/ReactFiberLazyComponent.js","status":"D"},{"path":"packages\/react-reconciler\/src\/ReactFiberWorkLoop.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactLazy-test.internal.js","status":"M"},{"path":"packages\/react-reconciler\/src\/__tests__\/ReactMemo-test.js","status":"M"},{"path":"packages\/react-server\/src\/ReactFizzServer.js","status":"M"},{"path":"packages\/react\/src\/ReactLazy.js","status":"M"},{"path":"packages\/react\/src\/__tests__\/ReactElementClone-test.js","status":"M"},{"path":"packages\/react\/src\/__tests__\/forwardRef-test.js","status":"M"},{"path":"packages\/react\/src\/jsx\/ReactJSXElement.js","status":"M"},{"path":"packages\/shared\/ReactFeatureFlags.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.native-fb.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.native-oss.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.test-renderer.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.test-renderer.www.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.www-dynamic.js","status":"M"},{"path":"packages\/shared\/forks\/ReactFeatureFlags.www.js","status":"M"}],"parents":["91d097b2c588a0977a7a10ed12512dc8a34e3a5b"]}

dillon1000/react

Files changed