[flags] remove enableOwnerStacks (#32426)

Bassed off: https://github.com/facebook/react/pull/32425

Wait to land internally.

[Commit to
review.](66aa6a4dbb)

This has landed everywhere

packages/internal-test-utils/__tests__/ReactInternalTestUtils-test.js

@@ -857,17 +857,6 @@ describe('ReactInternalTestUtils console assertions', () => {
 
           You must call one of the assertConsoleDev helpers between each act call."
         `);
-      } else if (gate(flags => flags.enableOwnerStacks)) {
-        expect(message).toMatchInlineSnapshot(`
-          "asserConsoleLogsCleared(expected)
-
-          console.log was called without assertConsoleLogDev:
-          + Not asserted
-          + Not asserted
-          + Not asserted
-
-          You must call one of the assertConsoleDev helpers between each act call."
-        `);
       } else {
         expect(message).toMatchInlineSnapshot(`
           "asserConsoleLogsCleared(expected)
@@ -937,20 +926,6 @@ describe('ReactInternalTestUtils console assertions', () => {
           + B
           + C
 
-          You must call one of the assertConsoleDev helpers between each act call."
-        `);
-      } else if (gate(flags => flags.enableOwnerStacks)) {
-        expect(message).toMatchInlineSnapshot(`
-          "asserConsoleLogsCleared(expected)
-
-          console.warn was called without assertConsoleWarnDev:
-          + A%s,
-          +     in App (at **)
-          + B%s,
-          +     in App (at **)
-          + C%s,
-          +     in App (at **)
-
           You must call one of the assertConsoleDev helpers between each act call."
         `);
       } else {
@@ -959,16 +934,10 @@ describe('ReactInternalTestUtils console assertions', () => {
 
           console.warn was called without assertConsoleWarnDev:
           + A%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
           + B%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
           + C%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
 
           You must call one of the assertConsoleDev helpers between each act call."
@@ -1023,33 +992,6 @@ describe('ReactInternalTestUtils console assertions', () => {
           + B
           + C
 
-          You must call one of the assertConsoleDev helpers between each act call."
-        `);
-      } else if (gate(flags => flags.enableOwnerStacks)) {
-        expect(message).toMatchInlineSnapshot(`
-          "asserConsoleLogsCleared(expected)
-
-          console.log was called without assertConsoleLogDev:
-          + A
-          + B
-          + C
-
-          console.warn was called without assertConsoleWarnDev:
-          + A%s,
-          +     in App (at **)
-          + B%s,
-          +     in App (at **)
-          + C%s,
-          +     in App (at **)
-
-          console.error was called without assertConsoleErrorDev:
-          + A%s,
-          +     in App (at **)
-          + B%s,
-          +     in App (at **)
-          + C%s,
-          +     in App (at **)
-
           You must call one of the assertConsoleDev helpers between each act call."
         `);
       } else {
@@ -1063,30 +1005,18 @@ describe('ReactInternalTestUtils console assertions', () => {
 
           console.warn was called without assertConsoleWarnDev:
           + A%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
           + B%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
           + C%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
 
           console.error was called without assertConsoleErrorDev:
           + A%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
           + B%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
           + C%s,
-          +     in Yield (at **)
-          +     in div (at **)
           +     in App (at **)
 
           You must call one of the assertConsoleDev helpers between each act call."
@@ -1927,20 +1857,6 @@ describe('ReactInternalTestUtils console assertions', () => {
           + Not asserted
           + Not asserted
 
-          You must call one of the assertConsoleDev helpers between each act call."
-        `);
-      } else if (gate(flags => flags.enableOwnerStacks)) {
-        expect(message).toMatchInlineSnapshot(`
-          "asserConsoleLogsCleared(expected)
-
-          console.warn was called without assertConsoleWarnDev:
-          + Not asserted%s,
-          +     in Yield (at **)
-          + Not asserted%s,
-          +     in Yield (at **)
-          + Not asserted%s,
-          +     in Yield (at **)
-
           You must call one of the assertConsoleDev helpers between each act call."
         `);
       } else {
@@ -1950,13 +1866,10 @@ describe('ReactInternalTestUtils console assertions', () => {
           console.warn was called without assertConsoleWarnDev:
           + Not asserted%s,
           +     in Yield (at **)
-          +     in div (at **)
           + Not asserted%s,
           +     in Yield (at **)
-          +     in div (at **)
           + Not asserted%s,
           +     in Yield (at **)
-          +     in div (at **)
 
           You must call one of the assertConsoleDev helpers between each act call."
         `);
@@ -2020,7 +1933,7 @@ describe('ReactInternalTestUtils console assertions', () => {
 
           You must call one of the assertConsoleDev helpers between each act call."
         `);
-      } else if (gate(flags => flags.enableOwnerStacks)) {
+      } else {
         expect(message).toMatchInlineSnapshot(`
                   "asserConsoleLogsCleared(expected)
 
@@ -2034,26 +1947,6 @@ describe('ReactInternalTestUtils console assertions', () => {
 
                   You must call one of the assertConsoleDev helpers between each act call."
               `);
-      } else {
-        expect(message).toMatchInlineSnapshot(`
-          "asserConsoleLogsCleared(expected)
-
-          console.error was called without assertConsoleErrorDev:
-          + A%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-          + B%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-          + C%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-
-          You must call one of the assertConsoleDev helpers between each act call."
-        `);
       }
     });
 
@@ -2106,7 +1999,7 @@ describe('ReactInternalTestUtils console assertions', () => {
 
           You must call one of the assertConsoleDev helpers between each act call."
         `);
-      } else if (gate(flags => flags.enableOwnerStacks)) {
+      } else {
         expect(message).toMatchInlineSnapshot(`
                   "asserConsoleLogsCleared(expected)
 
@@ -2133,45 +2026,6 @@ describe('ReactInternalTestUtils console assertions', () => {
 
                   You must call one of the assertConsoleDev helpers between each act call."
               `);
-      } else {
-        expect(message).toMatchInlineSnapshot(`
-          "asserConsoleLogsCleared(expected)
-
-          console.log was called without assertConsoleLogDev:
-          + A
-          + B
-          + C
-
-          console.warn was called without assertConsoleWarnDev:
-          + A%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-          + B%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-          + C%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-
-          console.error was called without assertConsoleErrorDev:
-          + A%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-          + B%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-          + C%s,
-          +     in Yield (at **)
-          +     in div (at **)
-          +     in App (at **)
-
-          You must call one of the assertConsoleDev helpers between each act call."
-        `);
       }
     });
 
@@ -3052,20 +2906,6 @@ describe('ReactInternalTestUtils console assertions', () => {
           + Not asserted
           + Not asserted
 
-          You must call one of the assertConsoleDev helpers between each act call."
-        `);
-      } else if (gate(flags => flags.enableOwnerStacks)) {
-        expect(message).toMatchInlineSnapshot(`
-          "asserConsoleLogsCleared(expected)
-
-          console.error was called without assertConsoleErrorDev:
-          + Not asserted%s,
-          +     in Yield (at **)
-          + Not asserted%s,
-          +     in Yield (at **)
-          + Not asserted%s,
-          +     in Yield (at **)
-
           You must call one of the assertConsoleDev helpers between each act call."
         `);
       } else {
@@ -3075,13 +2915,10 @@ describe('ReactInternalTestUtils console assertions', () => {
           console.error was called without assertConsoleErrorDev:
           + Not asserted%s,
           +     in Yield (at **)
-          +     in div (at **)
           + Not asserted%s,
           +     in Yield (at **)
-          +     in div (at **)
           + Not asserted%s,
           +     in Yield (at **)
-          +     in div (at **)
 
           You must call one of the assertConsoleDev helpers between each act call."
         `);

packages/internal-test-utils/consoleMock.js

@@ -6,6 +6,7 @@
  */
 
 /* eslint-disable react-internal/no-production-logging */
+
 const chalk = require('chalk');
 const util = require('util');
 const shouldIgnoreConsoleError = require('./shouldIgnoreConsoleError');
@@ -38,25 +39,16 @@ const patchConsoleMethod = (methodName, logged) => {
       (methodName === 'error' || methodName === 'warn')
     ) {
       const React = require('react');
+
+      // Ideally we could remove this check, but we have some tests like
+      // useSyncExternalStoreShared-test that tests against React 17,
+      // which doesn't have the captureOwnerStack method.
       if (React.captureOwnerStack) {
-        // enableOwnerStacks enabled. When it's always on, we can assume this case.
         const stack = React.captureOwnerStack();
         if (stack) {
           format += '%s';
           args.push(stack);
         }
-      } else {
-        // Otherwise we have to use internals to emulate parent stacks.
-        const ReactSharedInternals =
-          React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE ||
-          React.__SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE;
-        if (ReactSharedInternals && ReactSharedInternals.getCurrentStack) {
-          const stack = ReactSharedInternals.getCurrentStack();
-          if (stack !== '') {
-            format += '%s';
-            args.push(stack);
-          }
-        }
       }
     }
 

packages/react-cache/src/__tests__/ReactCacheOld-test.internal.js

@@ -203,11 +203,7 @@ describe('ReactCache', () => {
           "boolean, but instead received: [ 'Hi', 100 ]\n\n" +
           'To use non-primitive values as keys, you must pass a hash ' +
           'function as the second argument to createResource().\n' +
-          '    in App (at **)' +
+          '    in App (at **)',
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '\n    in Suspense (at **)'),
-
         ...(gate('enableSiblingPrerendering')
           ? [
               'Invalid key type. Expected a string, number, symbol, or ' +

packages/react-client/src/ReactFlightClient.js

@@ -45,7 +45,6 @@ import type {TemporaryReferenceSet} from './ReactFlightTemporaryReferences';
 
 import {
   enablePostpone,
-  enableOwnerStacks,
   enableProfilerTimer,
   enableComponentPerformanceTrack,
 } from 'shared/ReactFeatureFlags';
@@ -755,7 +754,7 @@ function createElement(
       configurable: false,
       enumerable: false,
       writable: true,
-      value: enableOwnerStacks ? validated : 1, // Whether the element has already been validated on the server.
+      value: validated, // Whether the element has already been validated on the server.
     });
     // debugInfo contains Server Component debug information.
     Object.defineProperty(element, '_debugInfo', {
@@ -765,79 +764,68 @@ function createElement(
       value: null,
     });
     let env = response._rootEnvironmentName;
-    if (enableOwnerStacks) {
+    if (owner !== null && owner.env != null) {
-      if (owner !== null && owner.env != null) {
+      // Interestingly we don't actually have the environment name of where
-        // Interestingly we don't actually have the environment name of where
+      // this JSX was created if it doesn't have an owner but if it does
-        // this JSX was created if it doesn't have an owner but if it does
+      // it must be the same environment as the owner. We could send it separately
-        // it must be the same environment as the owner. We could send it separately
+      // but it seems a bit unnecessary for this edge case.
-        // but it seems a bit unnecessary for this edge case.
+      env = owner.env;
-        env = owner.env;
+    }
-      }
+    let normalizedStackTrace: null | Error = null;
-      let normalizedStackTrace: null | Error = null;
+    if (owner === null && response._debugRootStack != null) {
-      if (owner === null && response._debugRootStack != null) {
+      // We override the stack if we override the owner since the stack where the root JSX
-        // We override the stack if we override the owner since the stack where the root JSX
+      // was created on the server isn't very useful but where the request was made is.
-        // was created on the server isn't very useful but where the request was made is.
+      normalizedStackTrace = response._debugRootStack;
-        normalizedStackTrace = response._debugRootStack;
+    } else if (stack !== null) {
-      } else if (stack !== null) {
+      // We create a fake stack and then create an Error object inside of it.
-        // We create a fake stack and then create an Error object inside of it.
+      // This means that the stack trace is now normalized into the native format
-        // This means that the stack trace is now normalized into the native format
+      // of the browser and the stack frames will have been registered with
-        // of the browser and the stack frames will have been registered with
+      // source mapping information.
-        // source mapping information.
+      // This can unfortunately happen within a user space callstack which will
-        // This can unfortunately happen within a user space callstack which will
+      // remain on the stack.
-        // remain on the stack.
+      normalizedStackTrace = createFakeJSXCallStackInDEV(response, stack, env);
-        normalizedStackTrace = createFakeJSXCallStackInDEV(
+    }
-          response,
+    Object.defineProperty(element, '_debugStack', {
-          stack,
+      configurable: false,
-          env,
+      enumerable: false,
-        );
+      writable: true,
-      }
+      value: normalizedStackTrace,
-      Object.defineProperty(element, '_debugStack', {
+    });
-        configurable: false,
-        enumerable: false,
-        writable: true,
-        value: normalizedStackTrace,
-      });
-
-      let task: null | ConsoleTask = null;
-      if (supportsCreateTask && stack !== null) {
-        const createTaskFn = (console: any).createTask.bind(
-          console,
-          getTaskName(type),
-        );
-        const callStack = buildFakeCallStack(
-          response,
-          stack,
-          env,
-          createTaskFn,
-        );
-        // This owner should ideally have already been initialized to avoid getting
-        // user stack frames on the stack.
-        const ownerTask =
-          owner === null ? null : initializeFakeTask(response, owner, env);
-        if (ownerTask === null) {
-          const rootTask = response._debugRootTask;
-          if (rootTask != null) {
-            task = rootTask.run(callStack);
-          } else {
-            task = callStack();
-          }
-        } else {
-          task = ownerTask.run(callStack);
-        }
-      }
-      Object.defineProperty(element, '_debugTask', {
-        configurable: false,
-        enumerable: false,
-        writable: true,
-        value: task,
-      });
 
+    let task: null | ConsoleTask = null;
+    if (supportsCreateTask && stack !== null) {
+      const createTaskFn = (console: any).createTask.bind(
+        console,
+        getTaskName(type),
+      );
+      const callStack = buildFakeCallStack(response, stack, env, createTaskFn);
       // This owner should ideally have already been initialized to avoid getting
       // user stack frames on the stack.
-      if (owner !== null) {
+      const ownerTask =
-        initializeFakeStack(response, owner);
+        owner === null ? null : initializeFakeTask(response, owner, env);
+      if (ownerTask === null) {
+        const rootTask = response._debugRootTask;
+        if (rootTask != null) {
+          task = rootTask.run(callStack);
+        } else {
+          task = callStack();
+        }
+      } else {
+        task = ownerTask.run(callStack);
       }
     }
+    Object.defineProperty(element, '_debugTask', {
+      configurable: false,
+      enumerable: false,
+      writable: true,
+      value: task,
+    });
+
+    // This owner should ideally have already been initialized to avoid getting
+    // user stack frames on the stack.
+    if (owner !== null) {
+      initializeFakeStack(response, owner);
+    }
   }
 
   if (initializingHandler !== null) {
@@ -863,13 +851,11 @@ function createElement(
           name: getComponentNameFromType(element.type) || '',
           owner: element._owner,
         };
-        if (enableOwnerStacks) {
+        // $FlowFixMe[cannot-write]
+        erroredComponent.debugStack = element._debugStack;
+        if (supportsCreateTask) {
           // $FlowFixMe[cannot-write]
-          erroredComponent.debugStack = element._debugStack;
+          erroredComponent.debugTask = element._debugTask;
-          if (supportsCreateTask) {
-            // $FlowFixMe[cannot-write]
-            erroredComponent.debugTask = element._debugTask;
-          }
         }
         erroredChunk._debugInfo = [erroredComponent];
       }
@@ -1057,13 +1043,11 @@ function waitForReference<T>(
           name: getComponentNameFromType(element.type) || '',
           owner: element._owner,
         };
-        if (enableOwnerStacks) {
+        // $FlowFixMe[cannot-write]
+        erroredComponent.debugStack = element._debugStack;
+        if (supportsCreateTask) {
           // $FlowFixMe[cannot-write]
-          erroredComponent.debugStack = element._debugStack;
+          erroredComponent.debugTask = element._debugTask;
-          if (supportsCreateTask) {
-            // $FlowFixMe[cannot-write]
-            erroredComponent.debugTask = element._debugTask;
-          }
         }
         const chunkDebugInfo: ReactDebugInfo =
           chunk._debugInfo || (chunk._debugInfo = []);
@@ -1223,13 +1207,11 @@ function loadServerReference<A: Iterable<any>, T>(
           name: getComponentNameFromType(element.type) || '',
           owner: element._owner,
         };
-        if (enableOwnerStacks) {
+        // $FlowFixMe[cannot-write]
+        erroredComponent.debugStack = element._debugStack;
+        if (supportsCreateTask) {
           // $FlowFixMe[cannot-write]
-          erroredComponent.debugStack = element._debugStack;
+          erroredComponent.debugTask = element._debugTask;
-          if (supportsCreateTask) {
-            // $FlowFixMe[cannot-write]
-            erroredComponent.debugTask = element._debugTask;
-          }
         }
         const chunkDebugInfo: ReactDebugInfo =
           chunk._debugInfo || (chunk._debugInfo = []);
@@ -1609,8 +1591,8 @@ function parseModelTuple(
       tuple[2],
       tuple[3],
       __DEV__ ? (tuple: any)[4] : null,
-      __DEV__ && enableOwnerStacks ? (tuple: any)[5] : null,
+      __DEV__ ? (tuple: any)[5] : null,
-      __DEV__ && enableOwnerStacks ? (tuple: any)[6] : 0,
+      __DEV__ ? (tuple: any)[6] : 0,
     );
   }
   return value;
@@ -2083,27 +2065,6 @@ function stopStream(
   controller.close(row === '' ? '"$undefined"' : row);
 }
 
-function formatV8Stack(
-  errorName: string,
-  errorMessage: string,
-  stack: null | ReactStackTrace,
-): string {
-  let v8StyleStack = errorName + ': ' + errorMessage;
-  if (stack) {
-    for (let i = 0; i < stack.length; i++) {
-      const frame = stack[i];
-      const [name, filename, line, col] = frame;
-      if (!name) {
-        v8StyleStack += '\n    at ' + filename + ':' + line + ':' + col;
-      } else {
-        v8StyleStack +=
-          '\n    at ' + name + ' (' + filename + ':' + line + ':' + col + ')';
-      }
-    }
-  }
-  return v8StyleStack;
-}
-
 type ErrorWithDigest = Error & {digest?: string};
 function resolveErrorProd(response: Response): Error {
   if (__DEV__) {
@@ -2202,34 +2163,20 @@ function resolvePostponeDev(
     );
   }
   let postponeInstance: Postpone;
-  if (!enableOwnerStacks) {
+  const callStack = buildFakeCallStack(
-    // Executing Error within a native stack isn't really limited to owner stacks
+    response,
-    // but we gate it behind the same flag for now while iterating.
+    stack,
-    // eslint-disable-next-line react-internal/prod-error-codes
+    env,
-    postponeInstance = (Error(reason || ''): any);
+    // $FlowFixMe[incompatible-use]
-    postponeInstance.$$typeof = REACT_POSTPONE_TYPE;
+    Error.bind(null, reason || ''),
-    // For backwards compat we use the V8 formatting when the flag is off.
+  );
-    postponeInstance.stack = formatV8Stack(
+  const rootTask = response._debugRootTask;
-      postponeInstance.name,
+  if (rootTask != null) {
-      postponeInstance.message,
+    postponeInstance = rootTask.run(callStack);
-      stack,
-    );
   } else {
-    const callStack = buildFakeCallStack(
+    postponeInstance = callStack();
-      response,
-      stack,
-      env,
-      // $FlowFixMe[incompatible-use]
-      Error.bind(null, reason || ''),
-    );
-    const rootTask = response._debugRootTask;
-    if (rootTask != null) {
-      postponeInstance = rootTask.run(callStack);
-    } else {
-      postponeInstance = callStack();
-    }
-    postponeInstance.$$typeof = REACT_POSTPONE_TYPE;
   }
+  postponeInstance.$$typeof = REACT_POSTPONE_TYPE;
   const chunks = response._chunks;
   const chunk = chunks.get(id);
   if (!chunk) {
@@ -2248,8 +2195,7 @@ function resolveHint<Code: HintCode>(
   dispatchHint(code, hintModel);
 }
 
-const supportsCreateTask =
+const supportsCreateTask = __DEV__ && !!(console: any).createTask;
-  __DEV__ && enableOwnerStacks && !!(console: any).createTask;
 
 type FakeFunction<T> = (() => T) => T;
 const fakeFunctionCache: Map<string, FakeFunction<any>> = __DEV__
@@ -2590,15 +2536,11 @@ function resolveDebugInfo(
 let currentOwnerInDEV: null | ReactComponentInfo = null;
 function getCurrentStackInDEV(): string {
   if (__DEV__) {
-    if (enableOwnerStacks) {
+    const owner: null | ReactComponentInfo = currentOwnerInDEV;
-      const owner: null | ReactComponentInfo = currentOwnerInDEV;
+    if (owner === null) {
-      if (owner === null) {
+      return '';
-        return '';
-      }
-      return getOwnerStackByComponentInfoInDev(owner);
     }
-    // We don't have Parent Stacks in Flight.
+    return getOwnerStackByComponentInfoInDev(owner);
-    return '';
   }
   return '';
 }

packages/react-client/src/__tests__/ReactFlight-test.js

@@ -321,9 +321,7 @@ describe('ReactFlight', () => {
                 env: 'Server',
                 key: null,
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in Object.<anonymous> (at **)',
-                  ? '    in Object.<anonymous> (at **)'
-                  : undefined,
                 props: {
                   firstName: 'Seb',
                   lastName: 'Smith',
@@ -367,9 +365,7 @@ describe('ReactFlight', () => {
                 env: 'Server',
                 key: null,
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in Object.<anonymous> (at **)',
-                  ? '    in Object.<anonymous> (at **)'
-                  : undefined,
                 props: {
                   firstName: 'Seb',
                   lastName: 'Smith',
@@ -1400,30 +1396,19 @@ describe('ReactFlight', () => {
             environmentName: 'Server',
           },
         ],
-        findSourceMapURLCalls: gate(flags => flags.enableOwnerStacks)
+        findSourceMapURLCalls: [
-          ? [
+          [__filename, 'Server'],
-              [__filename, 'Server'],
+          [__filename, 'Server'],
-              [__filename, 'Server'],
+          // TODO: What should we request here? The outer (<anonymous>) or the inner (inspected-page.html)?
-              // TODO: What should we request here? The outer (<anonymous>) or the inner (inspected-page.html)?
+          ['inspected-page.html:29:11), <anonymous>', 'Server'],
-              ['inspected-page.html:29:11), <anonymous>', 'Server'],
+          [
-              [
+            'file://~/(some)(really)(exotic-directory)/ReactFlight-test.js',
-                'file://~/(some)(really)(exotic-directory)/ReactFlight-test.js',
+            'Server',
-                'Server',
+          ],
-              ],
+          ['file:///testing.js', 'Server'],
-              ['file:///testing.js', 'Server'],
+          ['', 'Server'],
-              ['', 'Server'],
+          [__filename, 'Server'],
-              [__filename, 'Server'],
+        ],
-            ]
-          : [
-              // TODO: What should we request here? The outer (<anonymous>) or the inner (inspected-page.html)?
-              ['inspected-page.html:29:11), <anonymous>', 'Server'],
-              [
-                'file://~/(some)(really)(exotic-directory)/ReactFlight-test.js',
-                'Server',
-              ],
-              ['file:///testing.js', 'Server'],
-              ['', 'Server'],
-            ],
       });
     } else {
       expect(errors.map(getErrorForJestMatcher)).toEqual([
@@ -1475,9 +1460,6 @@ describe('ReactFlight', () => {
         'Check the render method of `Component`. See https://react.dev/link/warning-keys for more information.\n' +
         '    in span (at **)\n' +
         '    in Component (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '    in Indirection (at **)\n') +
         '    in App (at **)',
     ]);
   });
@@ -1538,46 +1520,26 @@ describe('ReactFlight', () => {
       },
     };
     const transport = ReactNoopFlightServer.render(<input value={obj} />);
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev(
-      assertConsoleErrorDev(
+      [
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Objects with toJSON methods are not supported. ' +
-            'Convert it manually to a simple value before passing it to props.\n' +
-            '  <input value={{toJSON: ...}}>\n' +
-            '               ^^^^^^^^^^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
-
-    ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Objects with toJSON methods are not supported. ' +
           'Convert it manually to a simple value before passing it to props.\n' +
           '  <input value={{toJSON: ...}}>\n' +
-          '               ^^^^^^^^^^^^^^^\n' +
+          '               ^^^^^^^^^^^^^^^',
-          '    at  (<anonymous>)',
+      ],
-      ]);
+      {withoutStack: true},
-    } else {
+    );
-      assertConsoleErrorDev(
+
-        [
+    ReactNoopFlightClient.read(transport);
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+    assertConsoleErrorDev([
-            'Objects with toJSON methods are not supported. ' +
+      'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Convert it manually to a simple value before passing it to props.\n' +
+        'Objects with toJSON methods are not supported. ' +
-            '  <input value={{toJSON: ...}}>\n' +
+        'Convert it manually to a simple value before passing it to props.\n' +
-            '               ^^^^^^^^^^^^^^^',
+        '  <input value={{toJSON: ...}}>\n' +
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+        '               ^^^^^^^^^^^^^^^\n' +
-            'Objects with toJSON methods are not supported. ' +
+        '    at  (<anonymous>)',
-            'Convert it manually to a simple value before passing it to props.\n' +
+    ]);
-            '  <input value={{toJSON: ...}}>\n' +
-            '               ^^^^^^^^^^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('should warn in DEV if a toJSON instance is passed to a host component child', () => {
@@ -1589,120 +1551,68 @@ describe('ReactFlight', () => {
     const transport = ReactNoopFlightServer.render(
       <div>Womp womp: {new MyError('spaghetti')}</div>,
     );
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev(
-      assertConsoleErrorDev(
+      [
-        [
-          'Error objects cannot be rendered as text children. Try formatting it using toString().\n' +
-            '  <div>Womp womp: {Error}</div>\n' +
-            '                  ^^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
-
-    ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
         'Error objects cannot be rendered as text children. Try formatting it using toString().\n' +
           '  <div>Womp womp: {Error}</div>\n' +
-          '                  ^^^^^^^\n' +
+          '                  ^^^^^^^',
-          '    at  (<anonymous>)',
+      ],
-      ]);
+      {withoutStack: true},
-    } else {
+    );
-      assertConsoleErrorDev(
+
-        [
+    ReactNoopFlightClient.read(transport);
-          'Error objects cannot be rendered as text children. Try formatting it using toString().\n' +
+    assertConsoleErrorDev([
-            '  <div>Womp womp: {Error}</div>\n' +
+      'Error objects cannot be rendered as text children. Try formatting it using toString().\n' +
-            '                  ^^^^^^^',
+        '  <div>Womp womp: {Error}</div>\n' +
-          'Error objects cannot be rendered as text children. Try formatting it using toString().\n' +
+        '                  ^^^^^^^\n' +
-            '  <div>Womp womp: {Error}</div>\n' +
+        '    at  (<anonymous>)',
-            '                  ^^^^^^^',
+    ]);
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('should warn in DEV if a special object is passed to a host component', () => {
     const transport = ReactNoopFlightServer.render(<input value={Math} />);
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev(
-      assertConsoleErrorDev(
+      [
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Math objects are not supported.\n' +
-            '  <input value={Math}>\n' +
-            '               ^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
-
-    ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Math objects are not supported.\n' +
           '  <input value={Math}>\n' +
-          '               ^^^^^^\n' +
+          '               ^^^^^^',
-          '    at  (<anonymous>)',
+      ],
-      ]);
+      {withoutStack: true},
-    } else {
+    );
-      assertConsoleErrorDev(
+
-        [
+    ReactNoopFlightClient.read(transport);
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+    assertConsoleErrorDev([
-            'Math objects are not supported.\n' +
+      'Only plain objects can be passed to Client Components from Server Components. ' +
-            '  <input value={Math}>\n' +
+        'Math objects are not supported.\n' +
-            '               ^^^^^^',
+        '  <input value={Math}>\n' +
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+        '               ^^^^^^\n' +
-            'Math objects are not supported.\n' +
+        '    at  (<anonymous>)',
-            '  <input value={Math}>\n' +
+    ]);
-            '               ^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('should warn in DEV if an object with symbols is passed to a host component', () => {
     const transport = ReactNoopFlightServer.render(
       <input value={{[Symbol.iterator]: {}}} />,
     );
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev(
-      assertConsoleErrorDev(
+      [
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
-            '  <input value={{}}>\n' +
-            '               ^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
-
-    ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Objects with symbol properties like Symbol.iterator are not supported.\n' +
           '  <input value={{}}>\n' +
-          '               ^^^^\n' +
+          '               ^^^^',
-          '    at  (<anonymous>)',
+      ],
-      ]);
+      {withoutStack: true},
-    } else {
+    );
-      assertConsoleErrorDev(
+
-        [
+    ReactNoopFlightClient.read(transport);
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+    assertConsoleErrorDev([
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
+      'Only plain objects can be passed to Client Components from Server Components. ' +
-            '  <input value={{}}>\n' +
+        'Objects with symbol properties like Symbol.iterator are not supported.\n' +
-            '               ^^^^',
+        '  <input value={{}}>\n' +
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+        '               ^^^^\n' +
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
+        '    at  (<anonymous>)',
-            '  <input value={{}}>\n' +
+    ]);
-            '               ^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('should warn in DEV if a toJSON instance is passed to a Client Component', () => {
@@ -1716,46 +1626,26 @@ describe('ReactFlight', () => {
     }
     const Client = clientReference(ClientImpl);
     const transport = ReactNoopFlightServer.render(<Client value={obj} />);
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev(
-      assertConsoleErrorDev(
+      [
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Objects with toJSON methods are not supported. ' +
-            'Convert it manually to a simple value before passing it to props.\n' +
-            '  <... value={{toJSON: ...}}>\n' +
-            '             ^^^^^^^^^^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
-
-    ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Objects with toJSON methods are not supported. ' +
           'Convert it manually to a simple value before passing it to props.\n' +
           '  <... value={{toJSON: ...}}>\n' +
-          '             ^^^^^^^^^^^^^^^\n' +
+          '             ^^^^^^^^^^^^^^^',
-          '    at  (<anonymous>)',
+      ],
-      ]);
+      {withoutStack: true},
-    } else {
+    );
-      assertConsoleErrorDev(
+
-        [
+    ReactNoopFlightClient.read(transport);
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+    assertConsoleErrorDev([
-            'Objects with toJSON methods are not supported. ' +
+      'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Convert it manually to a simple value before passing it to props.\n' +
+        'Objects with toJSON methods are not supported. ' +
-            '  <... value={{toJSON: ...}}>\n' +
+        'Convert it manually to a simple value before passing it to props.\n' +
-            '             ^^^^^^^^^^^^^^^',
+        '  <... value={{toJSON: ...}}>\n' +
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+        '             ^^^^^^^^^^^^^^^\n' +
-            'Objects with toJSON methods are not supported. ' +
+        '    at  (<anonymous>)',
-            'Convert it manually to a simple value before passing it to props.\n' +
+    ]);
-            '  <... value={{toJSON: ...}}>\n' +
-            '             ^^^^^^^^^^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('should warn in DEV if a toJSON instance is passed to a Client Component child', () => {
@@ -1771,46 +1661,26 @@ describe('ReactFlight', () => {
     const transport = ReactNoopFlightServer.render(
       <Client>Current date: {obj}</Client>,
     );
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev(
-      assertConsoleErrorDev(
+      [
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Objects with toJSON methods are not supported. ' +
-            'Convert it manually to a simple value before passing it to props.\n' +
-            '  <>Current date: {{toJSON: ...}}</>\n' +
-            '                  ^^^^^^^^^^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
-
-    ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Objects with toJSON methods are not supported. ' +
           'Convert it manually to a simple value before passing it to props.\n' +
           '  <>Current date: {{toJSON: ...}}</>\n' +
-          '                  ^^^^^^^^^^^^^^^\n' +
+          '                  ^^^^^^^^^^^^^^^',
-          '    at  (<anonymous>)',
+      ],
-      ]);
+      {withoutStack: true},
-    } else {
+    );
-      assertConsoleErrorDev(
+
-        [
+    ReactNoopFlightClient.read(transport);
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+    assertConsoleErrorDev([
-            'Objects with toJSON methods are not supported. ' +
+      'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Convert it manually to a simple value before passing it to props.\n' +
+        'Objects with toJSON methods are not supported. ' +
-            '  <>Current date: {{toJSON: ...}}</>\n' +
+        'Convert it manually to a simple value before passing it to props.\n' +
-            '                  ^^^^^^^^^^^^^^^',
+        '  <>Current date: {{toJSON: ...}}</>\n' +
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+        '                  ^^^^^^^^^^^^^^^\n' +
-            'Objects with toJSON methods are not supported. ' +
+        '    at  (<anonymous>)',
-            'Convert it manually to a simple value before passing it to props.\n' +
+    ]);
-            '  <>Current date: {{toJSON: ...}}</>\n' +
-            '                  ^^^^^^^^^^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('should warn in DEV if a special object is passed to a Client Component', () => {
@@ -1819,43 +1689,24 @@ describe('ReactFlight', () => {
     }
     const Client = clientReference(ClientImpl);
     const transport = ReactNoopFlightServer.render(<Client value={Math} />);
-
+    assertConsoleErrorDev(
-    if (gate(flags => flags.enableOwnerStacks)) {
+      [
-      assertConsoleErrorDev(
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Math objects are not supported.\n' +
-            '  <... value={Math}>\n' +
-            '             ^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
-
-    ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Math objects are not supported.\n' +
           '  <... value={Math}>\n' +
-          '             ^^^^^^\n' +
+          '             ^^^^^^',
-          '    at  (<anonymous>)',
+      ],
-      ]);
+      {withoutStack: true},
-    } else {
+    );
-      assertConsoleErrorDev(
+
-        [
+    ReactNoopFlightClient.read(transport);
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+    assertConsoleErrorDev([
-            'Math objects are not supported.\n' +
+      'Only plain objects can be passed to Client Components from Server Components. ' +
-            '  <... value={Math}>\n' +
+        'Math objects are not supported.\n' +
-            '             ^^^^^^',
+        '  <... value={Math}>\n' +
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+        '             ^^^^^^\n' +
-            'Math objects are not supported.\n' +
+        '    at  (<anonymous>)',
-            '  <... value={Math}>\n' +
+    ]);
-            '             ^^^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('should warn in DEV if an object with symbols is passed to a Client Component', () => {
@@ -1867,42 +1718,24 @@ describe('ReactFlight', () => {
     const transport = ReactNoopFlightServer.render(
       <Client value={{[Symbol.iterator]: {}}} />,
     );
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev(
-      assertConsoleErrorDev(
+      [
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
-            '  <... value={{}}>\n' +
-            '             ^^^^',
-        ],
-        {withoutStack: true},
-      );
-    }
-
-    ReactNoopFlightClient.read(transport);
-
-    if (gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Objects with symbol properties like Symbol.iterator are not supported.\n' +
           '  <... value={{}}>\n' +
-          '             ^^^^\n',
+          '             ^^^^',
-      ]);
+      ],
-    } else {
+      {withoutStack: true},
-      assertConsoleErrorDev(
+    );
-        [
+
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+    ReactNoopFlightClient.read(transport);
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
+
-            '  <... value={{}}>\n' +
+    assertConsoleErrorDev([
-            '             ^^^^',
+      'Only plain objects can be passed to Client Components from Server Components. ' +
-          'Only plain objects can be passed to Client Components from Server Components. ' +
+        'Objects with symbol properties like Symbol.iterator are not supported.\n' +
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
+        '  <... value={{}}>\n' +
-            '  <... value={{}}>\n' +
+        '             ^^^^\n',
-            '             ^^^^',
+    ]);
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('should warn in DEV if a special object is passed to a nested object in Client Component', () => {
@@ -1915,36 +1748,20 @@ describe('ReactFlight', () => {
     );
     ReactNoopFlightClient.read(transport);
 
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      [
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
-            '  <... value={{}}>\n' +
-            '             ^^^^',
-          {withoutStack: true},
-        ],
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Objects with symbol properties like Symbol.iterator are not supported.\n' +
           '  <... value={{}}>\n' +
-          '             ^^^^\n' +
+          '             ^^^^',
-          '    at  (<anonymous>)',
-      ]);
-    } else {
-      assertConsoleErrorDev(
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
-            '  <... value={{}}>\n' +
-            '             ^^^^',
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Objects with symbol properties like Symbol.iterator are not supported.\n' +
-            '  <... value={{}}>\n' +
-            '             ^^^^',
-        ],
         {withoutStack: true},
-      );
+      ],
-    }
+      'Only plain objects can be passed to Client Components from Server Components. ' +
+        'Objects with symbol properties like Symbol.iterator are not supported.\n' +
+        '  <... value={{}}>\n' +
+        '             ^^^^\n' +
+        '    at  (<anonymous>)',
+    ]);
   });
 
   it('should warn in DEV if a special object is passed to a nested array in Client Component', () => {
@@ -1956,36 +1773,20 @@ describe('ReactFlight', () => {
       <Client value={['looooong string takes up noise', Math, <h1>hi</h1>]} />,
     );
     ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      [
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Math objects are not supported.\n' +
-            '  [..., Math, <h1/>]\n' +
-            '        ^^^^',
-          {withoutStack: true},
-        ],
         'Only plain objects can be passed to Client Components from Server Components. ' +
           'Math objects are not supported.\n' +
           '  [..., Math, <h1/>]\n' +
-          '        ^^^^\n' +
+          '        ^^^^',
-          '    at  (<anonymous>)',
-      ]);
-    } else {
-      assertConsoleErrorDev(
-        [
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Math objects are not supported.\n' +
-            '  [..., Math, <h1/>]\n' +
-            '        ^^^^',
-          'Only plain objects can be passed to Client Components from Server Components. ' +
-            'Math objects are not supported.\n' +
-            '  [..., Math, <h1/>]\n' +
-            '        ^^^^',
-        ],
         {withoutStack: true},
-      );
+      ],
-    }
+      'Only plain objects can be passed to Client Components from Server Components. ' +
+        'Math objects are not supported.\n' +
+        '  [..., Math, <h1/>]\n' +
+        '        ^^^^\n' +
+        '    at  (<anonymous>)',
+    ]);
   });
 
   it('should NOT warn in DEV for key getters', () => {
@@ -2012,26 +1813,16 @@ describe('ReactFlight', () => {
     jest.resetModules();
     jest.mock('react', () => React);
     ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      'Each child in a list should have a unique "key" prop. ' +
-        'Each child in a list should have a unique "key" prop. ' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
+        '    in NoKey (at **)',
-          '    in NoKey (at **)',
+      'Each child in a list should have a unique "key" prop. ' +
-        'Each child in a list should have a unique "key" prop. ' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
+        '    in NoKey (at **)',
-          '    in NoKey (at **)',
+    ]);
-      ]);
-    } else {
-      assertConsoleErrorDev([
-        'Each child in a list should have a unique "key" prop.\n\n' +
-          'Check the top-level render call using <div>. ' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
-          '    in NoKey (at **)',
-      ]);
-    }
   });
 
-  // @gate !__DEV__ || enableOwnerStacks
   it('should warn in DEV a child is missing keys on a fragment', () => {
     // While we're on the server we need to have the Server version active to track component stacks.
     jest.resetModules();
@@ -2046,23 +1837,14 @@ describe('ReactFlight', () => {
     jest.resetModules();
     jest.mock('react', () => React);
     ReactNoopFlightClient.read(transport);
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      'Each child in a list should have a unique "key" prop. ' +
-        'Each child in a list should have a unique "key" prop. ' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
+        '    in Fragment (at **)',
-          '    in Fragment (at **)',
+      'Each child in a list should have a unique "key" prop. ' +
-        'Each child in a list should have a unique "key" prop. ' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
+        '    in Fragment (at **)',
-          '    in Fragment (at **)',
+    ]);
-      ]);
-    } else {
-      assertConsoleErrorDev([
-        'Each child in a list should have a unique "key" prop.\n\n' +
-          'Check the top-level render call using <div>. ' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
-          '    in Fragment (at **)',
-      ]);
-    }
   });
 
   it('should warn in DEV a child is missing keys in client component', async () => {
@@ -2079,20 +1861,12 @@ describe('ReactFlight', () => {
 
       ReactNoop.render(await ReactNoopFlightClient.read(transport));
     });
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        'Each child in a list should have a unique "key" prop.\n\n' +
+        'Check the top-level render call using <ParentClient>. ' +
-          'Check the top-level render call using <ParentClient>. ' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
+        '    in div (at **)',
-          '    in div (at **)',
+    ]);
-      ]);
-    } else {
-      assertConsoleErrorDev([
-        'Each child in a list should have a unique "key" prop. ' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
-          '    in div (at **)',
-      ]);
-    }
   });
 
   it('should error if a class instance is passed to a host component', () => {
@@ -3039,9 +2813,7 @@ describe('ReactFlight', () => {
                 env: 'Server',
                 key: null,
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in Object.<anonymous> (at **)',
-                  ? '    in Object.<anonymous> (at **)'
-                  : undefined,
                 props: {
                   transport: expect.arrayContaining([]),
                 },
@@ -3063,9 +2835,7 @@ describe('ReactFlight', () => {
                 env: 'third-party',
                 key: null,
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in Object.<anonymous> (at **)',
-                  ? '    in Object.<anonymous> (at **)'
-                  : undefined,
                 props: {},
               },
               {time: 14},
@@ -3082,9 +2852,7 @@ describe('ReactFlight', () => {
                 env: 'third-party',
                 key: null,
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in myLazy (at **)\n    in lazyInitializer (at **)',
-                  ? '    in myLazy (at **)\n    in lazyInitializer (at **)'
-                  : undefined,
                 props: {},
               },
               {time: 16},
@@ -3100,9 +2868,7 @@ describe('ReactFlight', () => {
                 env: 'third-party',
                 key: '3',
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in Object.<anonymous> (at **)',
-                  ? '    in Object.<anonymous> (at **)'
-                  : undefined,
                 props: {},
               },
               {time: 12},
@@ -3176,9 +2942,7 @@ describe('ReactFlight', () => {
                 env: 'Server',
                 key: null,
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in Object.<anonymous> (at **)',
-                  ? '    in Object.<anonymous> (at **)'
-                  : undefined,
                 props: {
                   transport: expect.arrayContaining([]),
                 },
@@ -3198,9 +2962,7 @@ describe('ReactFlight', () => {
                 env: 'Server',
                 key: 'keyed',
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in ServerComponent (at **)',
-                  ? '    in ServerComponent (at **)'
-                  : undefined,
                 props: {
                   children: {},
                 },
@@ -3219,9 +2981,7 @@ describe('ReactFlight', () => {
                 env: 'third-party',
                 key: null,
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in Object.<anonymous> (at **)',
-                  ? '    in Object.<anonymous> (at **)'
-                  : undefined,
                 props: {},
               },
               {time: 12},
@@ -3335,19 +3095,13 @@ describe('ReactFlight', () => {
     });
 
     expect(sawReactPrefix).toBe(false);
-    if (__DEV__ && gate(flags => flags.enableOwnerStacks)) {
+    if (__DEV__) {
       expect(environments.slice(0, 4)).toEqual([
         'Server',
         'third-party',
         'third-party',
         'third-party',
       ]);
-    } else if (__DEV__) {
-      expect(environments.slice(0, 3)).toEqual([
-        'third-party',
-        'third-party',
-        'third-party',
-      ]);
     } else {
       expect(environments).toEqual([]);
     }
@@ -3384,9 +3138,7 @@ describe('ReactFlight', () => {
                 env: 'A',
                 key: null,
                 owner: null,
-                stack: gate(flag => flag.enableOwnerStacks)
+                stack: '    in Object.<anonymous> (at **)',
-                  ? '    in Object.<anonymous> (at **)'
-                  : undefined,
                 props: {},
               },
               {
@@ -3402,7 +3154,7 @@ describe('ReactFlight', () => {
     expect(ReactNoop).toMatchRenderedOutput(<div>hi</div>);
   });
 
-  // @gate __DEV__ && enableOwnerStacks
+  // @gate __DEV__
   it('replays logs, but not onError logs', async () => {
     function foo() {
       return 'hello';
@@ -3574,9 +3326,7 @@ describe('ReactFlight', () => {
           env: 'Server',
           key: null,
           owner: null,
-          stack: gate(flag => flag.enableOwnerStacks)
+          stack: '    in Object.<anonymous> (at **)',
-            ? '    in Object.<anonymous> (at **)'
-            : undefined,
           props: {
             firstName: 'Seb',
           },
@@ -3590,9 +3340,7 @@ describe('ReactFlight', () => {
             env: 'Server',
             key: null,
             owner: greetInfo,
-            stack: gate(flag => flag.enableOwnerStacks)
+            stack: '    in Greeting (at **)',
-              ? '    in Greeting (at **)'
-              : undefined,
             props: {
               children: expect.objectContaining({
                 type: 'span',
@@ -3617,7 +3365,7 @@ describe('ReactFlight', () => {
     expect(ReactNoop).toMatchRenderedOutput(<span>Hello, Seb</span>);
   });
 
-  // @gate __DEV__ && enableOwnerStacks
+  // @gate __DEV__
   it('can get the component owner stacks during rendering in dev', () => {
     let stack;
 
@@ -3649,7 +3397,7 @@ describe('ReactFlight', () => {
     );
   });
 
-  // @gate __DEV__ && enableOwnerStacks
+  // @gate __DEV__
   it('can track owner for a flight response created in another render', async () => {
     jest.resetModules();
     jest.mock('react', () => ReactServer);
@@ -3712,7 +3460,7 @@ describe('ReactFlight', () => {
     );
   });
 
-  // @gate __DEV__ && enableOwnerStacks
+  // @gate __DEV__
   it('can get the component owner stacks for onError in dev', async () => {
     const thrownError = new Error('hi');
     let caughtError;
@@ -3754,7 +3502,6 @@ describe('ReactFlight', () => {
     );
   });
 
-  // @gate (enableOwnerStacks) || !__DEV__
   it('should include only one component stack in replayed logs (if DevTools or polyfill adds them)', () => {
     class MyError extends Error {
       toJSON() {

packages/react-debug-tools/src/__tests__/ReactHooksInspectionIntegration-test.js

@@ -2347,10 +2347,7 @@ describe('ReactHooksInspectionIntegration', () => {
 
     await act(async () => await LazyFoo);
     assertConsoleErrorDev([
-      'Foo: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.' +
+      'Foo: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.',
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '\n    in Foo (at **)\n' + '   in Suspense (at **)'),
     ]);
 
     const childFiber = renderer.root._currentFiber();

packages/react-devtools-shared/src/backend/profilingHooks.js

@@ -917,7 +917,7 @@ export function createProfilingHooks({
         // Creating a cache of component stacks won't help, generating a single stack is already expensive enough.
         // We should find a way to lazily generate component stacks on demand, when user inspects a specific event.
         // If we succeed with moving React DevTools Timeline Profiler to Performance panel, then Timeline Profiler would probably be removed.
-        // If not, then once enableOwnerStacks is adopted, revisit this again and cache component stacks per Fiber,
+        // Now that owner stacks are adopted, revisit this again and cache component stacks per Fiber,
         // but only return them when needed, sending hundreds of component stacks is beyond the Bridge's bandwidth.
 
         // Postprocess Profile data

packages/react-dom-bindings/src/client/validateDOMNesting.js

@@ -10,8 +10,6 @@
 import type {Fiber} from 'react-reconciler/src/ReactInternalTypes';
 import type {HydrationDiffNode} from 'react-reconciler/src/ReactFiberHydrationDiffs';
 
-import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
-
 import {
   current,
   runWithFiberInDEV,
@@ -615,7 +613,7 @@ function validateDOMNesting(
         ancestorDescription,
       );
     }
-    if (enableOwnerStacks && child) {
+    if (child) {
       // For debugging purposes find the nearest ancestor that caused the issue.
       // The stack trace of this ancestor can be useful to find the cause.
       // If the parent is a direct parent in the same owner, we don't bother.

packages/react-dom-bindings/src/events/DOMPluginEventSystem.js

@@ -52,7 +52,6 @@ import {
   enableLegacyFBSupport,
   enableCreateEventHandleAPI,
   enableScopeAPI,
-  enableOwnerStacks,
   disableCommentsAsDOMContainers,
   enableScrollEndPolyfill,
 } from 'shared/ReactFeatureFlags';
@@ -275,7 +274,7 @@ function processDispatchQueueItemsInOrder(
       if (instance !== previousInstance && event.isPropagationStopped()) {
         return;
       }
-      if (__DEV__ && enableOwnerStacks && instance !== null) {
+      if (__DEV__ && instance !== null) {
         runWithFiberInDEV(
           instance,
           executeDispatch,
@@ -294,7 +293,7 @@ function processDispatchQueueItemsInOrder(
       if (instance !== previousInstance && event.isPropagationStopped()) {
         return;
       }
-      if (__DEV__ && enableOwnerStacks && instance !== null) {
+      if (__DEV__ && instance !== null) {
         runWithFiberInDEV(
           instance,
           executeDispatch,

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

@@ -75,8 +75,7 @@ describe('ReactChildReconciler', () => {
         'This may happen if you return fn instead of <fn /> from render. ' +
         'Or maybe you meant to call this function rather than return it.\n' +
         '  <h1>{fn}</h1>\n' +
-        '    in h1 (at **)' +
+        '    in h1 (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n   in div (at **)'),
     ]);
     const node = container.firstChild;
 
@@ -100,7 +99,6 @@ describe('ReactChildReconciler', () => {
         'Keys should be unique so that components maintain their identity across updates. ' +
         'Non-unique keys may cause children to be duplicated and/or omitted — ' +
         'the behavior is unsupported and could change in a future version.\n' +
-        (gate('enableOwnerStacks') ? '' : '    in div (at **)\n') +
         '    in div (at **)\n' +
         '    in Component (at **)',
     ]);
@@ -137,11 +135,7 @@ describe('ReactChildReconciler', () => {
         'duplicated and/or omitted — the behavior is unsupported and ' +
         'could change in a future version.\n' +
         '    in div (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks) ? '' : '    in div (at **)\n') +
         '    in Component (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '    in Parent (at **)\n') +
         '    in GrandParent (at **)',
     ]);
   });
@@ -165,7 +159,6 @@ describe('ReactChildReconciler', () => {
         'duplicated and/or omitted — the behavior is unsupported and ' +
         'could change in a future version.\n' +
         '    in div (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks) ? '' : '    in div (at **)\n') +
         '    in Component (at **)',
     ]);
   });
@@ -201,11 +194,7 @@ describe('ReactChildReconciler', () => {
         'duplicated and/or omitted — the behavior is unsupported and ' +
         'could change in a future version.\n' +
         '    in div (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks) ? '' : '    in div (at **)\n') +
         '    in Component (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '    in Parent (at **)\n') +
         '    in GrandParent (at **)',
     ]);
   });

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

@@ -407,17 +407,6 @@ describe('ReactComponent', () => {
 
     const X = undefined;
     const XElement = <X />;
-    if (gate(flags => !flags.enableOwnerStacks)) {
-      assertConsoleErrorDev(
-        [
-          'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-            'or a class/function (for composite components) but got: undefined. ' +
-            "You likely forgot to export your component from the file it's defined in, " +
-            'or you might have mixed up default and named imports.',
-        ],
-        {withoutStack: true},
-      );
-    }
     await expect(async () => {
       await act(() => {
         root.render(XElement);
@@ -433,15 +422,6 @@ describe('ReactComponent', () => {
 
     const Y = null;
     const YElement = <Y />;
-    if (gate(flags => !flags.enableOwnerStacks)) {
-      assertConsoleErrorDev(
-        [
-          'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-            'or a class/function (for composite components) but got: null.',
-        ],
-        {withoutStack: true},
-      );
-    }
     await expect(async () => {
       await act(() => {
         root.render(YElement);
@@ -453,15 +433,6 @@ describe('ReactComponent', () => {
 
     const Z = true;
     const ZElement = <Z />;
-    if (gate(flags => !flags.enableOwnerStacks)) {
-      assertConsoleErrorDev(
-        [
-          'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-            'or a class/function (for composite components) but got: boolean.',
-        ],
-        {withoutStack: true},
-      );
-    }
     await expect(async () => {
       await act(() => {
         root.render(ZElement);
@@ -506,26 +477,6 @@ describe('ReactComponent', () => {
             '\n\nCheck the render method of `Bar`.'
           : ''),
     );
-    if (!gate('enableOwnerStacks')) {
-      assertConsoleErrorDev([
-        'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-          'or a class/function (for composite components) but got: undefined.' +
-          (__DEV__
-            ? " You likely forgot to export your component from the file it's defined in, " +
-              'or you might have mixed up default and named imports.\n' +
-              '    in Bar (at **)\n' +
-              '    in Foo (at **)'
-            : ''),
-        'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-          'or a class/function (for composite components) but got: undefined.' +
-          (__DEV__
-            ? " You likely forgot to export your component from the file it's defined in, " +
-              'or you might have mixed up default and named imports.\n' +
-              '    in Bar (at **)\n' +
-              '    in Foo (at **)'
-            : ''),
-      ]);
-    }
   });
 
   it('throws if a plain object is used as a child', async () => {
@@ -693,9 +644,6 @@ describe('ReactComponent', () => {
           'Or maybe you meant to call this function rather than return it.\n' +
           '  <span>{Foo}</span>\n' +
           '    in span (at **)\n' +
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '    in div (at **)\n') +
           '    in Foo (at **)',
       ]);
     });
@@ -753,9 +701,6 @@ describe('ReactComponent', () => {
           'Or maybe you meant to call this function rather than return it.\n' +
           '  <span>{Foo}</span>\n' +
           '    in span (at **)\n' +
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '    in div (at **)\n') +
           '    in Foo (at **)',
       ]);
       await act(() => {

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

@@ -1396,9 +1396,6 @@ describe('ReactCompositeComponent', () => {
       'Cannot update a component (`A`) while rendering a different component (`B`). ' +
         'To locate the bad setState() call inside `B`, ' +
         'follow the stack trace as described in https://react.dev/link/setstate-in-render\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in B (at **)\n' + '    in div (at **)\n') +
         '    in Parent (at **)',
     ]);
 

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

@@ -545,7 +545,6 @@ describe('ReactDOM', () => {
       // ReactDOM(App > div > span)
       'Invalid ARIA attribute `ariaTypo`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
         '    in span (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks) ? '' : '    in div (at **)\n') +
         '    in App (at **)',
       // ReactDOM(App > div > ServerEntry) >>> ReactDOMServer(Child) >>> ReactDOMServer(App2) >>> ReactDOMServer(blink)
       'Invalid ARIA attribute `ariaTypo2`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
@@ -562,7 +561,6 @@ describe('ReactDOM', () => {
       // ReactDOM(App > div > font)
       'Invalid ARIA attribute `ariaTypo5`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
         '    in font (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks) ? '' : '    in div (at **)\n') +
         '    in App (at **)',
     ]);
   });

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

@@ -1845,8 +1845,7 @@ describe('ReactDOMComponent', () => {
       assertConsoleErrorDev([
         'The tag <menuitem> is unrecognized in this browser. ' +
           'If you meant to render a React component, start its name with an uppercase letter.\n' +
-          '    in menuitem (at **)' +
+          '    in menuitem (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in menu (at **)'),
       ]);
     });
 
@@ -2242,10 +2241,7 @@ describe('ReactDOMComponent', () => {
           '> <div>\n' +
           '>   <tr>\n' +
           '    ...\n' +
-          '\n    in tr (at **)' +
+          '\n    in tr (at **)',
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '\n    in div (at **)'),
       ]);
     });
 
@@ -2264,10 +2260,7 @@ describe('ReactDOMComponent', () => {
         'In HTML, <p> cannot be a descendant of <p>.\n' +
           'This will cause a hydration error.' +
           // There is no outer `p` here because root container is not part of the stack.
-          '\n    in p (at **)' +
+          '\n    in p (at **)',
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '\n    in span (at **)'),
       ]);
     });
 
@@ -2294,92 +2287,48 @@ describe('ReactDOMComponent', () => {
       await act(() => {
         root.render(<Foo />);
       });
-      assertConsoleErrorDev(
+      assertConsoleErrorDev([
-        gate(flags => flags.enableOwnerStacks)
+        'In HTML, <tr> cannot be a child of ' +
-          ? [
+          '<table>. Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated ' +
-              'In HTML, <tr> cannot be a child of ' +
+          'by the browser.\n' +
-                '<table>. Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated ' +
+          'This will cause a hydration error.\n' +
-                'by the browser.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '  <Foo>\n' +
-                '\n' +
+          '>   <table>\n' +
-                '  <Foo>\n' +
+          '      <Row>\n' +
-                '>   <table>\n' +
+          '>       <tr>\n' +
-                '      <Row>\n' +
+          '      ...\n' +
-                '>       <tr>\n' +
+          '\n    in tr (at **)' +
-                '      ...\n' +
+          '\n    in Row (at **)' +
-                '\n    in tr (at **)' +
+          '\n    in Foo (at **)',
-                '\n    in Row (at **)' +
+        '<table> cannot contain a nested <tr>.\nSee this log for the ancestor stack trace.' +
-                '\n    in Foo (at **)',
+          '\n    in table (at **)' +
-              '<table> cannot contain a nested <tr>.\nSee this log for the ancestor stack trace.' +
+          '\n    in Foo (at **)',
-                '\n    in table (at **)' +
+        'In HTML, text nodes cannot be a ' +
-                '\n    in Foo (at **)',
+          'child of <tr>.\n' +
-              'In HTML, text nodes cannot be a ' +
+          'This will cause a hydration error.\n' +
-                'child of <tr>.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '  <Foo>\n' +
-                '\n' +
+          '    <table>\n' +
-                '  <Foo>\n' +
+          '      <Row>\n' +
-                '    <table>\n' +
+          '        <tr>\n' +
-                '      <Row>\n' +
+          '>         x\n' +
-                '        <tr>\n' +
+          '      ...\n' +
-                '>         x\n' +
+          '\n    in tr (at **)' +
-                '      ...\n' +
+          '\n    in Row (at **)' +
-                '\n    in tr (at **)' +
+          '\n    in Foo (at **)',
-                '\n    in Row (at **)' +
+        'In HTML, whitespace text nodes cannot ' +
-                '\n    in Foo (at **)',
+          "be a child of <table>. Make sure you don't have any extra " +
-              'In HTML, whitespace text nodes cannot ' +
+          'whitespace between tags on each line of your source code.\n' +
-                "be a child of <table>. Make sure you don't have any extra " +
+          'This will cause a hydration error.\n' +
-                'whitespace between tags on each line of your source code.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '  <Foo>\n' +
-                '\n' +
+          '>   <table>\n' +
-                '  <Foo>\n' +
+          '      <Row>\n' +
-                '>   <table>\n' +
+          '>     {" "}\n' +
-                '      <Row>\n' +
+          '\n    in table (at **)' +
-                '>     {" "}\n' +
+          '\n    in Foo (at **)',
-                '\n    in table (at **)' +
+      ]);
-                '\n    in Foo (at **)',
-            ]
-          : [
-              'In HTML, <tr> cannot be a child of ' +
-                '<table>. Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated ' +
-                'by the browser.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '  <Foo>\n' +
-                '>   <table>\n' +
-                '      <Row>\n' +
-                '>       <tr>\n' +
-                '      ...\n' +
-                '\n    in tr (at **)' +
-                '\n    in Row (at **)' +
-                '\n    in table (at **)' +
-                '\n    in Foo (at **)',
-              'In HTML, text nodes cannot be a ' +
-                'child of <tr>.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '  <Foo>\n' +
-                '    <table>\n' +
-                '      <Row>\n' +
-                '        <tr>\n' +
-                '>         x\n' +
-                '      ...\n' +
-                '\n    in tr (at **)' +
-                '\n    in Row (at **)' +
-                '\n    in table (at **)' +
-                '\n    in Foo (at **)',
-              'In HTML, whitespace text nodes cannot ' +
-                "be a child of <table>. Make sure you don't have any extra " +
-                'whitespace between tags on each line of your source code.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '  <Foo>\n' +
-                '>   <table>\n' +
-                '      <Row>\n' +
-                '>     {" "}\n' +
-                '\n    in table (at **)' +
-                '\n    in Foo (at **)',
-            ],
-      );
     });
 
     it('warns nicely for updating table rows to use text', async () => {
@@ -2445,12 +2394,7 @@ describe('ReactDOMComponent', () => {
           '          <tr>\n' +
           '>           text\n' +
           '\n    in tr (at **)' +
-          '\n    in Row (at **)' +
+          '\n    in Row (at **)',
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '\n    in tbody (at **)' +
-              '\n    in table (at **)' +
-              '\n    in Foo (at **)'),
       ]);
     });
 
@@ -2477,49 +2421,28 @@ describe('ReactDOMComponent', () => {
       await act(() => {
         root.render(<App1 />);
       });
-      assertConsoleErrorDev(
+      assertConsoleErrorDev([
-        gate(flags => flags.enableOwnerStacks)
+        'In HTML, <tr> cannot be a child of <table>. ' +
-          ? [
+          'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-              'In HTML, <tr> cannot be a child of <table>. ' +
+          'This will cause a hydration error.\n' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '  <App1>\n' +
-                '\n' +
+          '    <Viz1>\n' +
-                '  <App1>\n' +
+          '>     <table>\n' +
-                '    <Viz1>\n' +
+          '        <FancyRow>\n' +
-                '>     <table>\n' +
+          '          <Row>\n' +
-                '        <FancyRow>\n' +
+          '>           <tr>\n' +
-                '          <Row>\n' +
+          '\n    in tr (at **)' +
-                '>           <tr>\n' +
+          '\n    in Row (at **)' +
-                '\n    in tr (at **)' +
+          '\n    in FancyRow (at **)' +
-                '\n    in Row (at **)' +
+          '\n    in Viz1 (at **)' +
-                '\n    in FancyRow (at **)' +
+          '\n    in App1 (at **)',
-                '\n    in Viz1 (at **)' +
+        '<table> cannot contain a nested <tr>.\n' +
-                '\n    in App1 (at **)',
+          'See this log for the ancestor stack trace.\n' +
-              '<table> cannot contain a nested <tr>.\n' +
+          '    in table (at **)\n' +
-                'See this log for the ancestor stack trace.\n' +
+          '    in Viz1 (at **)\n' +
-                '    in table (at **)\n' +
+          '    in App1 (at **)',
-                '    in Viz1 (at **)\n' +
+      ]);
-                '    in App1 (at **)',
-            ]
-          : [
-              'In HTML, <tr> cannot be a child of <table>. ' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '  <App1>\n' +
-                '    <Viz1>\n' +
-                '>     <table>\n' +
-                '        <FancyRow>\n' +
-                '          <Row>\n' +
-                '>           <tr>\n' +
-                '\n    in tr (at **)' +
-                '\n    in Row (at **)' +
-                '\n    in FancyRow (at **)' +
-                '\n    in table (at **)' +
-                '\n    in Viz1 (at **)' +
-                '\n    in App1 (at **)',
-            ],
-      );
     });
 
     it('gives useful context in warnings 2', async () => {
@@ -2558,57 +2481,32 @@ describe('ReactDOMComponent', () => {
       await act(() => {
         root.render(<App2 />);
       });
-      assertConsoleErrorDev(
+      assertConsoleErrorDev([
-        gate(flags => flags.enableOwnerStacks)
+        'In HTML, <tr> cannot be a child of <table>. ' +
-          ? [
+          'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-              'In HTML, <tr> cannot be a child of <table>. ' +
+          'This will cause a hydration error.\n' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '  <App2>\n' +
-                '\n' +
+          '    <Viz2>\n' +
-                '  <App2>\n' +
+          '      <FancyTable>\n' +
-                '    <Viz2>\n' +
+          '        <Table>\n' +
-                '      <FancyTable>\n' +
+          '>         <table>\n' +
-                '        <Table>\n' +
+          '            <FancyRow>\n' +
-                '>         <table>\n' +
+          '              <Row>\n' +
-                '            <FancyRow>\n' +
+          '>               <tr>\n' +
-                '              <Row>\n' +
+          '\n    in tr (at **)' +
-                '>               <tr>\n' +
+          '\n    in Row (at **)' +
-                '\n    in tr (at **)' +
+          '\n    in FancyRow (at **)' +
-                '\n    in Row (at **)' +
+          '\n    in Viz2 (at **)' +
-                '\n    in FancyRow (at **)' +
+          '\n    in App2 (at **)',
-                '\n    in Viz2 (at **)' +
+        '<table> cannot contain a nested <tr>.\n' +
-                '\n    in App2 (at **)',
+          'See this log for the ancestor stack trace.\n' +
-              '<table> cannot contain a nested <tr>.\n' +
+          '    in table (at **)\n' +
-                'See this log for the ancestor stack trace.\n' +
+          '    in Table (at **)\n' +
-                '    in table (at **)\n' +
+          '    in FancyTable (at **)\n' +
-                '    in Table (at **)\n' +
+          '    in Viz2 (at **)\n' +
-                '    in FancyTable (at **)\n' +
+          '    in App2 (at **)',
-                '    in Viz2 (at **)\n' +
+      ]);
-                '    in App2 (at **)',
-            ]
-          : [
-              'In HTML, <tr> cannot be a child of <table>. ' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '  <App2>\n' +
-                '    <Viz2>\n' +
-                '      <FancyTable>\n' +
-                '        <Table>\n' +
-                '>         <table>\n' +
-                '            <FancyRow>\n' +
-                '              <Row>\n' +
-                '>               <tr>\n' +
-                '\n    in tr (at **)' +
-                '\n    in Row (at **)' +
-                '\n    in FancyRow (at **)' +
-                '\n    in table (at **)' +
-                '\n    in Table (at **)' +
-                '\n    in FancyTable (at **)' +
-                '\n    in Viz2 (at **)' +
-                '\n    in App2 (at **)',
-            ],
-      );
     });
 
     it('gives useful context in warnings 3', async () => {
@@ -2640,47 +2538,26 @@ describe('ReactDOMComponent', () => {
           </FancyTable>,
         );
       });
-      assertConsoleErrorDev(
+      assertConsoleErrorDev([
-        gate(flags => flags.enableOwnerStacks)
+        'In HTML, <tr> cannot be a child of <table>. ' +
-          ? [
+          'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-              'In HTML, <tr> cannot be a child of <table>. ' +
+          'This will cause a hydration error.\n' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '  <FancyTable>\n' +
-                '\n' +
+          '    <Table>\n' +
-                '  <FancyTable>\n' +
+          '>     <table>\n' +
-                '    <Table>\n' +
+          '        <FancyRow>\n' +
-                '>     <table>\n' +
+          '          <Row>\n' +
-                '        <FancyRow>\n' +
+          '>           <tr>\n' +
-                '          <Row>\n' +
+          '\n    in tr (at **)' +
-                '>           <tr>\n' +
+          '\n    in Row (at **)' +
-                '\n    in tr (at **)' +
+          '\n    in FancyRow (at **)',
-                '\n    in Row (at **)' +
+        '<table> cannot contain a nested <tr>.\n' +
-                '\n    in FancyRow (at **)',
+          'See this log for the ancestor stack trace.' +
-              '<table> cannot contain a nested <tr>.\n' +
+          '\n    in table (at **)' +
-                'See this log for the ancestor stack trace.' +
+          '\n    in Table (at **)' +
-                '\n    in table (at **)' +
+          '\n    in FancyTable (at **)',
-                '\n    in Table (at **)' +
+      ]);
-                '\n    in FancyTable (at **)',
-            ]
-          : [
-              'In HTML, <tr> cannot be a child of <table>. ' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '  <FancyTable>\n' +
-                '    <Table>\n' +
-                '>     <table>\n' +
-                '        <FancyRow>\n' +
-                '          <Row>\n' +
-                '>           <tr>\n' +
-                '\n    in tr (at **)' +
-                '\n    in Row (at **)' +
-                '\n    in FancyRow (at **)' +
-                '\n    in table (at **)' +
-                '\n    in Table (at **)' +
-                '\n    in FancyTable (at **)',
-            ],
-      );
     });
 
     it('gives useful context in warnings 4', async () => {
@@ -2701,39 +2578,22 @@ describe('ReactDOMComponent', () => {
           </table>,
         );
       });
-      assertConsoleErrorDev(
+      assertConsoleErrorDev([
-        gate(flags => flags.enableOwnerStacks)
+        'In HTML, <tr> cannot be a child of <table>. ' +
-          ? [
+          'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-              'In HTML, <tr> cannot be a child of <table>. ' +
+          'This will cause a hydration error.\n' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '> <table>\n' +
-                '\n' +
+          '    <FancyRow>\n' +
-                '> <table>\n' +
+          '      <Row>\n' +
-                '    <FancyRow>\n' +
+          '>       <tr>\n' +
-                '      <Row>\n' +
+          '\n    in tr (at **)' +
-                '>       <tr>\n' +
+          '\n    in Row (at **)' +
-                '\n    in tr (at **)' +
+          '\n    in FancyRow (at **)',
-                '\n    in Row (at **)' +
+        '<table> cannot contain a nested <tr>.\n' +
-                '\n    in FancyRow (at **)',
+          'See this log for the ancestor stack trace.' +
-              '<table> cannot contain a nested <tr>.\n' +
+          '\n    in table (at **)',
-                'See this log for the ancestor stack trace.' +
+      ]);
-                '\n    in table (at **)',
-            ]
-          : [
-              'In HTML, <tr> cannot be a child of <table>. ' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '> <table>\n' +
-                '    <FancyRow>\n' +
-                '      <Row>\n' +
-                '>       <tr>\n' +
-                '\n    in tr (at **)' +
-                '\n    in Row (at **)' +
-                '\n    in FancyRow (at **)' +
-                '\n    in table (at **)',
-            ],
-      );
     });
 
     it('gives useful context in warnings 5', async () => {
@@ -2758,39 +2618,22 @@ describe('ReactDOMComponent', () => {
           </FancyTable>,
         );
       });
-      assertConsoleErrorDev(
+      assertConsoleErrorDev([
-        gate(flags => flags.enableOwnerStacks)
+        'In HTML, <tr> cannot be a child of <table>. ' +
-          ? [
+          'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-              'In HTML, <tr> cannot be a child of <table>. ' +
+          'This will cause a hydration error.\n' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '  <FancyTable>\n' +
-                '\n' +
+          '    <Table>\n' +
-                '  <FancyTable>\n' +
+          '>     <table>\n' +
-                '    <Table>\n' +
+          '>       <tr>\n' +
-                '>     <table>\n' +
+          '\n    in tr (at **)',
-                '>       <tr>\n' +
+        '<table> cannot contain a nested <tr>.\n' +
-                '\n    in tr (at **)',
+          'See this log for the ancestor stack trace.' +
-              '<table> cannot contain a nested <tr>.\n' +
+          '\n    in table (at **)' +
-                'See this log for the ancestor stack trace.' +
+          '\n    in Table (at **)' +
-                '\n    in table (at **)' +
+          '\n    in FancyTable (at **)',
-                '\n    in Table (at **)' +
+      ]);
-                '\n    in FancyTable (at **)',
-            ]
-          : [
-              'In HTML, <tr> cannot be a child of <table>. ' +
-                'Add a <tbody>, <thead> or <tfoot> to your code to match the DOM tree generated by the browser.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '  <FancyTable>\n' +
-                '    <Table>\n' +
-                '>     <table>\n' +
-                '>       <tr>\n' +
-                '\n    in tr (at **)' +
-                '\n    in table (at **)' +
-                '\n    in Table (at **)' +
-                '\n    in FancyTable (at **)',
-            ],
-      );
 
       class Link extends React.Component {
         render() {
@@ -2807,40 +2650,22 @@ describe('ReactDOMComponent', () => {
           </Link>,
         );
       });
-      assertConsoleErrorDev(
+      assertConsoleErrorDev([
-        gate(flags => flags.enableOwnerStacks)
+        'In HTML, <a> cannot be a descendant of <a>.\n' +
-          ? [
+          'This will cause a hydration error.\n' +
-              'In HTML, <a> cannot be a descendant of <a>.\n' +
+          '\n' +
-                'This will cause a hydration error.\n' +
+          '  <Link>\n' +
-                '\n' +
+          '>   <a>\n' +
-                '  <Link>\n' +
+          '      <div>\n' +
-                '>   <a>\n' +
+          '        <Link>\n' +
-                '      <div>\n' +
+          '>         <a>\n' +
-                '        <Link>\n' +
+          '\n    in a (at **)' +
-                '>         <a>\n' +
+          '\n    in Link (at **)',
-                '\n    in a (at **)' +
+        '<a> cannot contain a nested <a>.\n' +
-                '\n    in Link (at **)',
+          'See this log for the ancestor stack trace.' +
-              '<a> cannot contain a nested <a>.\n' +
+          '\n    in a (at **)' +
-                'See this log for the ancestor stack trace.' +
+          '\n    in Link (at **)',
-                '\n    in a (at **)' +
+      ]);
-                '\n    in Link (at **)',
-            ]
-          : [
-              'In HTML, <a> cannot be a descendant of <a>.\n' +
-                'This will cause a hydration error.\n' +
-                '\n' +
-                '  <Link>\n' +
-                '>   <a>\n' +
-                '      <div>\n' +
-                '        <Link>\n' +
-                '>         <a>\n' +
-                '\n    in a (at **)' +
-                '\n    in Link (at **)' +
-                '\n    in div (at **)' +
-                '\n    in a (at **)' +
-                '\n    in Link (at **)',
-            ],
-      );
     });
 
     it('should warn about incorrect casing on properties (ssr)', () => {
@@ -3099,11 +2924,9 @@ describe('ReactDOMComponent', () => {
       });
       assertConsoleErrorDev([
         'Invalid DOM property `class`. Did you mean `className`?\n' +
-          '    in span (at **)' +
+          '    in span (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in div (at **)'),
         'Invalid event handler property `onclick`. Did you mean `onClick`?\n' +
-          '    in strong (at **)' +
+          '    in strong (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in div (at **)'),
       ]);
     });
 
@@ -3119,12 +2942,10 @@ describe('ReactDOMComponent', () => {
       );
       assertConsoleErrorDev([
         'Invalid DOM property `class`. Did you mean `className`?\n' +
-          '    in span (at **)' +
+          '    in span (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in div (at **)'),
         'Invalid event handler property `onclick`. ' +
           'React events use the camelCase naming convention, for example `onClick`.\n' +
-          '    in strong (at **)' +
+          '    in strong (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in div (at **)'),
       ]);
     });
 
@@ -3175,12 +2996,10 @@ describe('ReactDOMComponent', () => {
         'Invalid DOM property `class`. Did you mean `className`?\n' +
           '    in span (at **)\n' +
           '    in Child1 (at **)\n' +
-          (gate('enableOwnerStacks') ? '' : '    in div (at **)\n') +
           '    in Parent (at **)',
         'Invalid event handler property `onclick`. Did you mean `onClick`?\n' +
           '    in strong (at **)\n' +
           '    in Child3 (at **)\n' +
-          (gate('enableOwnerStacks') ? '' : '    in div (at **)\n') +
           '    in Parent (at **)',
       ]);
     });
@@ -3230,13 +3049,11 @@ describe('ReactDOMComponent', () => {
         'Invalid DOM property `class`. Did you mean `className`?\n' +
           '    in span (at **)\n' +
           '    in Child1 (at **)\n' +
-          (gate('enableOwnerStacks') ? '' : '    in div (at **)\n') +
           '    in Parent (at **)',
         'Invalid event handler property `onclick`. ' +
           'React events use the camelCase naming convention, for example `onClick`.\n' +
           '    in strong (at **)\n' +
           '    in Child3 (at **)\n' +
-          (gate('enableOwnerStacks') ? '' : '    in div (at **)\n') +
           '    in Parent (at **)',
       ]);
     });
@@ -3362,8 +3179,7 @@ describe('ReactDOMComponent', () => {
       });
       assertConsoleErrorDev([
         'Invalid DOM property `arabic-form`. Did you mean `arabicForm`?\n' +
-          '    in text (at **)' +
+          '    in text (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in svg (at **)'),
       ]);
       const text = el.querySelector('text');
 
@@ -3844,8 +3660,7 @@ describe('ReactDOMComponent', () => {
       });
       assertConsoleErrorDev([
         'Invalid DOM property `x-height`. Did you mean `xHeight`?\n' +
-          '    in font-face (at **)' +
+          '    in font-face (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in svg (at **)'),
       ]);
 
       expect(el.querySelector('font-face').hasAttribute('x-height')).toBe(
@@ -3871,8 +3686,7 @@ describe('ReactDOMComponent', () => {
           'whatever="false" or whatever={value.toString()}.\n\n' +
           'If you used to conditionally omit it with whatever={condition && value}, ' +
           'pass whatever={condition ? value : undefined} instead.\n' +
-          '    in font-face (at **)' +
+          '    in font-face (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in svg (at **)'),
       ]);
 
       expect(el.querySelector('font-face').hasAttribute('whatever')).toBe(

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

@@ -751,7 +751,6 @@ describe('ReactDOMFiber', () => {
         '    in Parent (at **)',
       'Component uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Component (at **)\n') +
         '    in Parent (at **)',
     ]);
     expect(container.innerHTML).toBe('');

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

@@ -386,7 +386,6 @@ describe('ReactDOMFizzForm', () => {
       'Cannot specify a formTarget for a button that specifies a function as a formAction. ' +
         'The function will always be executed in the same window.\n' +
         '    in input (at **)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in form (at **)\n') +
         '    in App (at **)',
     ]);
     let root;

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

@@ -1843,15 +1843,9 @@ describe('ReactDOMFizzServer', () => {
     assertConsoleErrorDev([
       '<inCorrectTag /> is using incorrect casing. Use PascalCase for React components, or lowercase for HTML elements.' +
         '\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in inCorrectTag (at **)\n' +
-          ? '    in inCorrectTag (at **)\n' +
+        '    in C (at **)\n' +
-            '    in C (at **)\n' +
+        '    in A (at **)',
-            '    in A (at **)'
-          : '    in inCorrectTag (at **)\n' +
-            '    in C (at **)\n' +
-            '    in Suspense (at **)\n' +
-            '    in div (at **)\n' +
-            '    in A (at **)'),
     ]);
 
     await act(() => {
@@ -1862,17 +1856,11 @@ describe('ReactDOMFizzServer', () => {
     assertConsoleErrorDev([
       'Each child in a list should have a unique "key" prop.\n\nCheck the render method of `B`.' +
         ' See https://react.dev/link/warning-keys for more information.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in span (at **)\n' +
-          ? '    in span (at **)\n' +
+        '    in mapper (at **)\n' +
-            '    in mapper (at **)\n' +
+        '    in Array.map (at **)\n' +
-            '    in Array.map (at **)\n' +
+        '    in B (at **)\n' +
-            '    in B (at **)\n' +
+        '    in A (at **)',
-            '    in A (at **)'
-          : '    in span (at **)\n' +
-            '    in B (at **)\n' +
-            '    in Suspense (at **)\n' +
-            '    in div (at **)\n' +
-            '    in A (at **)'),
     ]);
 
     expect(getVisibleChildren(container)).toEqual(
@@ -1954,13 +1942,7 @@ describe('ReactDOMFizzServer', () => {
         '    in TestProvider (at **)',
       'TestConsumer uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in TestConsumer (at **)' +
+        '    in TestConsumer (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in TestProvider (at **)' +
-            '\n    in Suspense (at **)' +
-            '\n    in div (at **)' +
-            '\n    in TestProvider (at **)'),
     ]);
     expect(getVisibleChildren(container)).toEqual(
       <div>
@@ -5871,7 +5853,6 @@ describe('ReactDOMFizzServer', () => {
           'If your `children` prop is using this form try rewriting it using a template string: ' +
           '<title>{`hello ${nameOfUser}`}</title>.\n' +
           '    in title (at **)\n' +
-          (gate('enableOwnerStacks') ? '' : '    in head (at **)\n') +
           '    in App (at **)',
       ]);
 
@@ -5917,7 +5898,6 @@ describe('ReactDOMFizzServer', () => {
           'React Component try moving the <title> tag into that component. ' +
           'If the `children` of <title> is some HTML markup change it to be Text only to be valid HTML.\n' +
           '    in title (at **)\n' +
-          (gate('enableOwnerStacks') ? '' : '    in head (at **)\n') +
           '    in App (at **)',
       ]);
       // object titles are toStringed when float is on
@@ -5961,7 +5941,6 @@ describe('ReactDOMFizzServer', () => {
           'string or number value if so. Otherwise implement a `toString` method that React can ' +
           'use to produce a valid <title>.\n' +
           '    in title (at **)\n' +
-          (gate('enableOwnerStacks') ? '' : '    in head (at **)\n') +
           '    in App (at **)',
       ]);
       // object titles are toStringed when float is on
@@ -6545,23 +6524,11 @@ describe('ReactDOMFizzServer', () => {
 
     assertConsoleErrorDev([
       'A script element was rendered with a number for children. If script element has children it must be a single string. Consider using dangerouslySetInnerHTML or passing a plain string as children.' +
-        componentStack(
+        componentStack(['script', 'App']),
-          gate(flags => flags.enableOwnerStacks)
-            ? ['script', 'App']
-            : ['script', 'body', 'html', 'App'],
-        ),
       'A script element was rendered with an array for children. If script element has children it must be a single string. Consider using dangerouslySetInnerHTML or passing a plain string as children.' +
-        componentStack(
+        componentStack(['script', 'App']),
-          gate(flags => flags.enableOwnerStacks)
-            ? ['script', 'App']
-            : ['script', 'body', 'html', 'App'],
-        ),
       'A script element was rendered with something unexpected for children. If script element has children it must be a single string. Consider using dangerouslySetInnerHTML or passing a plain string as children.' +
-        componentStack(
+        componentStack(['script', 'App']),
-          gate(flags => flags.enableOwnerStacks)
-            ? ['script', 'App']
-            : ['script', 'body', 'html', 'App'],
-        ),
     ]);
   });
 
@@ -8544,7 +8511,7 @@ describe('ReactDOMFizzServer', () => {
     expect(document.body.textContent).toBe('HelloWorld');
   });
 
-  // @gate __DEV__ && enableOwnerStacks
+  // @gate __DEV__
   it('can get the component owner stacks during rendering in dev', async () => {
     let stack;
 
@@ -8577,7 +8544,7 @@ describe('ReactDOMFizzServer', () => {
     );
   });
 
-  // @gate __DEV__ && enableOwnerStacks
+  // @gate __DEV__
   it('can get the component owner stacks for onError in dev', async () => {
     const thrownError = new Error('hi');
     let caughtError;
@@ -9111,56 +9078,30 @@ describe('ReactDOMFizzServer', () => {
         </body>
       </html>,
     );
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      [
-        [
+        'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.',
-          'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.',
+        {withoutStack: true},
-          {withoutStack: true},
+      ],
-        ],
+      'In HTML, <meta> cannot be a child of <html>.\nThis will cause a hydration error.' +
-        'In HTML, <meta> cannot be a child of <html>.\nThis will cause a hydration error.' +
+        '\n' +
-          '\n' +
+        '\n  <App>' +
-          '\n  <App>' +
+        '\n>   <html>' +
-          '\n>   <html>' +
+        '\n      <Suspense fallback="this fallb...">' +
-          '\n      <Suspense fallback="this fallb...">' +
+        '\n        <meta>' +
-          '\n        <meta>' +
+        '\n>       <meta itemProp="" content="before">' +
-          '\n>       <meta itemProp="" content="before">' +
+        '\n      ...' +
-          '\n      ...' +
+        '\n' +
-          '\n' +
+        '\n    in meta (at **)' +
-          '\n    in meta (at **)' +
+        '\n    in App (at **)',
-          '\n    in App (at **)',
+      '<html> cannot contain a nested <meta>.\nSee this log for the ancestor stack trace.' +
-        '<html> cannot contain a nested <meta>.\nSee this log for the ancestor stack trace.' +
+        '\n    in html (at **)' +
-          '\n    in html (at **)' +
+        '\n    in App (at **)',
-          '\n    in App (at **)',
+      [
-        [
+        'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.',
-          'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.',
+        {withoutStack: true},
-          {withoutStack: true},
+      ],
-        ],
+    ]);
-      ]);
-    } else {
-      assertConsoleErrorDev([
-        'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.' +
-          '\n    in Suspense (at **)' +
-          '\n    in html (at **)' +
-          '\n    in App (at **)',
-        'In HTML, <meta> cannot be a child of <html>.\nThis will cause a hydration error.' +
-          '\n' +
-          '\n  <App>' +
-          '\n>   <html>' +
-          '\n      <Suspense fallback="this fallb...">' +
-          '\n        <meta>' +
-          '\n>       <meta itemProp="" content="before">' +
-          '\n      ...' +
-          '\n' +
-          '\n    in meta (at **)' +
-          '\n    in Suspense (at **)' +
-          '\n    in html (at **)' +
-          '\n    in App (at **)',
-        'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.' +
-          '\n    in Suspense (at **)' +
-          '\n    in html (at **)' +
-          '\n    in App (at **)',
-      ]);
-    }
 
     await root.unmount();
     expect(getVisibleChildren(document)).toEqual(
@@ -9253,56 +9194,30 @@ describe('ReactDOMFizzServer', () => {
         </body>
       </html>,
     );
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      [
-        [
+        'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.',
-          'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.',
+        {withoutStack: true},
-          {withoutStack: true},
+      ],
-        ],
+      'In HTML, <meta> cannot be a child of <html>.\nThis will cause a hydration error.' +
-        'In HTML, <meta> cannot be a child of <html>.\nThis will cause a hydration error.' +
+        '\n' +
-          '\n' +
+        '\n  <App>' +
-          '\n  <App>' +
+        '\n>   <html>' +
-          '\n>   <html>' +
+        '\n      <Suspense fallback="this fallb...">' +
-          '\n      <Suspense fallback="this fallb...">' +
+        '\n        <meta>' +
-          '\n        <meta>' +
+        '\n>       <meta itemProp="" content="before">' +
-          '\n>       <meta itemProp="" content="before">' +
+        '\n      ...' +
-          '\n      ...' +
+        '\n' +
-          '\n' +
+        '\n    in meta (at **)' +
-          '\n    in meta (at **)' +
+        '\n    in App (at **)',
-          '\n    in App (at **)',
+      '<html> cannot contain a nested <meta>.\nSee this log for the ancestor stack trace.' +
-        '<html> cannot contain a nested <meta>.\nSee this log for the ancestor stack trace.' +
+        '\n    in html (at **)' +
-          '\n    in html (at **)' +
+        '\n    in App (at **)',
-          '\n    in App (at **)',
+      [
-        [
+        'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.',
-          'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.',
+        {withoutStack: true},
-          {withoutStack: true},
+      ],
-        ],
+    ]);
-      ]);
-    } else {
-      assertConsoleErrorDev([
-        'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.' +
-          '\n    in Suspense (at **)' +
-          '\n    in html (at **)' +
-          '\n    in App (at **)',
-        'In HTML, <meta> cannot be a child of <html>.\nThis will cause a hydration error.' +
-          '\n' +
-          '\n  <App>' +
-          '\n>   <html>' +
-          '\n      <Suspense fallback="this fallb...">' +
-          '\n        <meta>' +
-          '\n>       <meta itemProp="" content="before">' +
-          '\n      ...' +
-          '\n' +
-          '\n    in meta (at **)' +
-          '\n    in Suspense (at **)' +
-          '\n    in html (at **)' +
-          '\n    in App (at **)',
-        'Cannot render a <meta> outside the main document if it has an `itemProp` prop. `itemProp` suggests the tag belongs to an `itemScope` which can appear anywhere in the DOM. If you were intending for React to hoist this <meta> remove the `itemProp` prop. Otherwise, try moving this tag into the <head> or <body> of the Document.' +
-          '\n    in Suspense (at **)' +
-          '\n    in html (at **)' +
-          '\n    in App (at **)',
-      ]);
-    }
 
     await root.unmount();
     expect(getVisibleChildren(document)).toEqual(

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

@@ -529,8 +529,7 @@ describe('ReactDOMFloat', () => {
         '>   <template>\n' +
         '    ...\n' +
         '\n' +
-        '    in template (at **)' +
+        '    in template (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
 
     root.render(
@@ -555,8 +554,7 @@ describe('ReactDOMFloat', () => {
         '    <body>\n' +
         '>   <style>\n' +
         '\n' +
-        '    in style (at **)' +
+        '    in style (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
 
     root.render(
@@ -596,8 +594,7 @@ describe('ReactDOMFloat', () => {
         '    <body>\n' +
         '>   <script href="foo">\n' +
         '\n' +
-        '    in script (at **)' +
+        '    in script (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
 
     root.render(
@@ -2269,21 +2266,11 @@ body {
         'spell it as lowercase `nonstandardattr` instead. If you accidentally passed it from a ' +
         'parent component, remove it from the DOM element.\n' +
         '    in link (at **)\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in div (at **)\n' +
-            '    in body (at **)\n' +
-            '    in html (at **)\n') +
         '    in App (at **)',
       'Invalid values for props `shouldnotincludefunctions`, `norsymbols` on <link> tag. ' +
         'Either remove them from the element, or pass a string or number value to keep them in the DOM. ' +
         'For details, see https://react.dev/link/attribute-behavior \n' +
         '    in link (at **)\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in div (at **)\n' +
-            '    in body (at **)\n' +
-            '    in html (at **)\n') +
         '    in App (at **)',
     ]);
 
@@ -2642,8 +2629,7 @@ body {
         '> <html>\n' +
         '>   <meta itemProp="foo">' +
         '\n' +
-        '\n    in meta (at **)' +
+        '\n    in meta (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
   });
 
@@ -2668,8 +2654,7 @@ body {
         '> <html>\n' +
         '>   <title itemProp="foo">' +
         '\n' +
-        '\n    in title (at **)' +
+        '\n    in title (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
   });
 
@@ -2694,8 +2679,7 @@ body {
         '> <html>\n' +
         '>   <style itemProp="foo">' +
         '\n' +
-        '\n    in style (at **)' +
+        '\n    in style (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
   });
 
@@ -2720,8 +2704,7 @@ body {
         '> <html>\n' +
         '>   <link itemProp="foo">\n' +
         '\n' +
-        '    in link (at **)' +
+        '    in link (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
   });
 
@@ -2746,8 +2729,7 @@ body {
         '> <html>\n' +
         '>   <script itemProp="foo">\n' +
         '\n' +
-        '    in script (at **)' +
+        '    in script (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
   });
 
@@ -4844,9 +4826,6 @@ body {
       'React encountered a hoistable style tag for the same href as a preload: "foo". ' +
         'When using a style tag to inline styles you should not also preload it as a stylsheet.\n' +
         '    in style (at **)\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in body (at **)\n' + '    in html (at **)\n') +
         '    in App (at **)',
     ]);
 
@@ -7753,64 +7732,43 @@ body {
             'If your intent was to have React hoist and deduplciate this stylesheet using the ' +
             '`precedence` prop ensure there is a non-empty string `href` prop as well, ' +
             'otherwise remove the `precedence` prop.\n' +
-            '    in link (at **)' +
+            '    in link (at **)',
-            (gate('enableOwnerStacks')
-              ? ''
-              : '\n    in body (at **)' + '\n    in html (at **)'),
           'React encountered a `<link rel="stylesheet" .../>` with a `precedence` prop and ' +
             'expected the `href` prop to be a non-empty string but ecountered an empty string instead. ' +
             'If your intent was to have React hoist and deduplciate this stylesheet using the ' +
             '`precedence` prop ensure there is a non-empty string `href` prop as well, ' +
             'otherwise remove the `precedence` prop.\n' +
-            '    in link (at **)' +
+            '    in link (at **)',
-            (gate('enableOwnerStacks')
-              ? ''
-              : '\n    in body (at **)' + '\n    in html (at **)'),
           'An empty string ("") was passed to the href attribute. ' +
             'To fix this, either do not render the element at all or ' +
             'pass null to href instead of an empty string.\n' +
-            '    in link (at **)' +
+            '    in link (at **)',
-            (gate('enableOwnerStacks')
-              ? ''
-              : '\n    in body (at **)' + '\n    in html (at **)'),
           'React encountered a `<link rel="stylesheet" .../>` with a `precedence` prop and ' +
             '`onLoad` and `onError` props. The presence of loading and error handlers indicates ' +
             'an intent to manage the stylesheet loading state from your from your Component code ' +
             'and React will not hoist or deduplicate this stylesheet. ' +
             'If your intent was to have React hoist and deduplciate this stylesheet using the ' +
             '`precedence` prop remove the `onLoad` and `onError` props, otherwise remove the `precedence` prop.\n' +
-            '    in link (at **)' +
+            '    in link (at **)',
-            (gate('enableOwnerStacks')
-              ? ''
-              : '\n    in body (at **)' + '\n    in html (at **)'),
           'React encountered a `<link rel="stylesheet" .../>` with a `precedence` prop and ' +
             '`onLoad` prop. The presence of loading and error handlers indicates an intent to ' +
             'manage the stylesheet loading state from your from your Component code and ' +
             'React will not hoist or deduplicate this stylesheet. ' +
             'If your intent was to have React hoist and deduplciate this stylesheet using the ' +
             '`precedence` prop remove the `onLoad` prop, otherwise remove the `precedence` prop.\n' +
-            '    in link (at **)' +
+            '    in link (at **)',
-            (gate('enableOwnerStacks')
-              ? ''
-              : '\n    in body (at **)' + '\n    in html (at **)'),
           'React encountered a `<link rel="stylesheet" .../>` with a `precedence` prop and `onError` prop. ' +
             'The presence of loading and error handlers indicates an intent to manage the stylesheet loading state ' +
             'from your from your Component code and React will not hoist or deduplicate this stylesheet. ' +
             'If your intent was to have React hoist and deduplciate this stylesheet using the `precedence` ' +
             'prop remove the `onError` prop, otherwise remove the `precedence` prop.\n' +
-            '    in link (at **)' +
+            '    in link (at **)',
-            (gate('enableOwnerStacks')
-              ? ''
-              : '\n    in body (at **)' + '\n    in html (at **)'),
           'React encountered a `<link rel="stylesheet" .../>` with a `precedence` prop and a `disabled` prop. ' +
             'The presence of the `disabled` prop indicates an intent to manage the stylesheet active state from ' +
             'your from your Component code and React will not hoist or deduplicate this stylesheet. ' +
             'If your intent was to have React hoist and deduplciate this stylesheet using the `precedence` ' +
             'prop remove the `disabled` prop, otherwise remove the `precedence` prop.\n' +
-            '    in link (at **)' +
+            '    in link (at **)',
-            (gate('enableOwnerStacks')
-              ? ''
-              : '\n    in body (at **)' + '\n    in html (at **)'),
         ].filter(Boolean),
       );
 
@@ -7836,8 +7794,7 @@ body {
           'loading state from your from your Component code and React will not hoist or deduplicate this stylesheet. ' +
           'If your intent was to have React hoist and deduplciate this stylesheet using the `precedence` ' +
           'prop remove the `onLoad` and `onError` props, otherwise remove the `precedence` prop.\n' +
-          '    in body (at **)' +
+          '    in body (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
       ]);
     });
 
@@ -8429,10 +8386,7 @@ background-color: green;
           'using the `precedence` prop to not have any spaces but ecountered spaces instead. ' +
           'using spaces in this prop will cause hydration of this style to fail on the client. ' +
           'The href for the <style> where this ocurred is "foo bar".\n' +
-          '    in style (at **)' +
+          '    in style (at **)',
-          (gate('enableOwnerStacks')
-            ? ''
-            : '\n    in body (at **)' + '\n    in html (at **)'),
       ]);
     });
   });

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

@@ -391,8 +391,7 @@ describe('ReactDOMForm', () => {
         '> <form action={function outerAction}>\n' +
         '    <input>\n' +
         '>   <form action={function innerAction} ref={{current:null}}>\n' +
-        '\n    in form (at **)' +
+        '\n    in form (at **)',
-        (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in form (at **)'),
     ]);
 
     await submit(ref.current);
@@ -588,8 +587,7 @@ describe('ReactDOMForm', () => {
       'Cannot specify a "name" prop for a button that specifies a function as a formAction. ' +
         'React needs it to encode which action should be invoked. ' +
         'It will get overridden.\n' +
-        '    in input (at **)' +
+        '    in input (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in form (at **)'),
     ]);
 
     await submit(inputRef.current);
@@ -1971,7 +1969,6 @@ describe('ReactDOMForm', () => {
         'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
         'For details, see https://react.dev/link/attribute-behavior \n' +
         '    in button (at **)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in form (at **)\n') +
         '    in App (at **)',
     ]);
     await submit(buttonRef.current);

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

@@ -59,10 +59,7 @@ describe('ReactDOMOption', () => {
         '>   <div>\n' +
         '    ...\n' +
         '\n' +
-        '    in div (at **)' +
+        '    in div (at **)',
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '\n    in option (at **)'),
     ]);
     expect(container.firstChild.innerHTML).toBe('1 <div></div> 2');
     await renderIntoDocument(el);
@@ -279,10 +276,7 @@ describe('ReactDOMOption', () => {
         '>     <div ref={{current:null}}>\n' +
         '      ...\n' +
         '\n' +
-        '    in div (at **)' +
+        '    in div (at **)',
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '\n    in option (at **)' + '\n    in select (at **)'),
     ]);
     option = container.firstChild.firstChild;
 

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

@@ -794,7 +794,6 @@ describe('ReactDOMSelect', () => {
       'Use the `defaultValue` or `value` props on <select> instead of ' +
         'setting `selected` on <option>.\n' +
         '    in option (at **)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in select (at **)\n') +
         '    in App (at **)',
     ]);
 
@@ -1072,8 +1071,7 @@ describe('ReactDOMSelect', () => {
         'Invalid value for prop `value` on <option> tag. ' +
           'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
           'For details, see https://react.dev/link/attribute-behavior \n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
 
       const node = container.firstChild;
@@ -1096,8 +1094,7 @@ describe('ReactDOMSelect', () => {
         'Invalid value for prop `value` on <option> tag. ' +
           'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
           'For details, see https://react.dev/link/attribute-behavior \n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
 
       let node = container.firstChild;
@@ -1134,8 +1131,7 @@ describe('ReactDOMSelect', () => {
         'Invalid value for prop `value` on <option> tag. ' +
           'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
           'For details, see https://react.dev/link/attribute-behavior \n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
 
       const node = container.firstChild;
@@ -1158,8 +1154,7 @@ describe('ReactDOMSelect', () => {
         'Invalid value for prop `value` on <option> tag. ' +
           'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
           'For details, see https://react.dev/link/attribute-behavior \n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
 
       let node = container.firstChild;
@@ -1199,8 +1194,7 @@ describe('ReactDOMSelect', () => {
         'Invalid value for prop `value` on <option> tag. ' +
           'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
           'For details, see https://react.dev/link/attribute-behavior \n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
 
       const node = container.firstChild;
@@ -1223,8 +1217,7 @@ describe('ReactDOMSelect', () => {
         'Invalid value for prop `value` on <option> tag. ' +
           'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
           'For details, see https://react.dev/link/attribute-behavior \n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
 
       const node = container.firstChild;
@@ -1247,8 +1240,7 @@ describe('ReactDOMSelect', () => {
         'Invalid value for prop `value` on <option> tag. ' +
           'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
           'For details, see https://react.dev/link/attribute-behavior \n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
 
       let node = container.firstChild;
@@ -1284,8 +1276,7 @@ describe('ReactDOMSelect', () => {
         'Invalid value for prop `value` on <option> tag. ' +
           'Either remove it from the element, or pass a string or number value to keep it in the DOM. ' +
           'For details, see https://react.dev/link/attribute-behavior \n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
 
       let node = container.firstChild;
@@ -1366,12 +1357,10 @@ describe('ReactDOMSelect', () => {
       assertConsoleErrorDev([
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
     });
 
@@ -1395,12 +1384,10 @@ describe('ReactDOMSelect', () => {
       assertConsoleErrorDev([
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
     });
 
@@ -1467,8 +1454,7 @@ describe('ReactDOMSelect', () => {
       assertConsoleErrorDev([
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
     });
 
@@ -1508,8 +1494,7 @@ describe('ReactDOMSelect', () => {
       assertConsoleErrorDev([
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
         'Form field values (value, checked, defaultValue, or defaultChecked props)' +
           ' must be strings, not TemporalLike. ' +
           'This value must be coerced to a string before using it here.\n' +
@@ -1563,12 +1548,10 @@ describe('ReactDOMSelect', () => {
       assertConsoleErrorDev([
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
     });
 
@@ -1591,12 +1574,10 @@ describe('ReactDOMSelect', () => {
       assertConsoleErrorDev([
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
     });
 
@@ -1670,12 +1651,10 @@ describe('ReactDOMSelect', () => {
       assertConsoleErrorDev([
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
         'The provided `value` attribute is an unsupported type TemporalLike.' +
           ' This value must be coerced to a string before using it here.\n' +
-          '    in option (at **)' +
+          '    in option (at **)',
-          (gate('enableOwnerStacks') ? '' : '\n    in select (at **)'),
       ]);
     });
 

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

@@ -995,18 +995,6 @@ describe('ReactDOMServerIntegration', () => {
         async render => {
           let EmptyComponent = {};
           EmptyComponent = <EmptyComponent />;
-          assertConsoleErrorDev(
-            gate(flags => flags.enableOwnerStacks)
-              ? []
-              : [
-                  'React.jsx: type is invalid -- expected a string ' +
-                    '(for built-in components) or a class/function (for composite ' +
-                    'components) but got: object. You likely forgot to export your ' +
-                    "component from the file it's defined in, or you might have mixed up " +
-                    'default and named imports.',
-                ],
-            {withoutStack: true},
-          );
           await render(EmptyComponent);
         },
         'Element type is invalid: expected a string (for built-in components) or a class/function ' +
@@ -1022,16 +1010,6 @@ describe('ReactDOMServerIntegration', () => {
         async render => {
           let NullComponent = null;
           NullComponent = <NullComponent />;
-          assertConsoleErrorDev(
-            gate(flags => flags.enableOwnerStacks)
-              ? []
-              : [
-                  'React.jsx: type is invalid -- expected a string ' +
-                    '(for built-in components) or a class/function (for composite ' +
-                    'components) but got: null.',
-                ],
-            {withoutStack: true},
-          );
           await render(NullComponent);
         },
         'Element type is invalid: expected a string (for built-in components) or a class/function ' +
@@ -1043,19 +1021,6 @@ describe('ReactDOMServerIntegration', () => {
         async render => {
           let UndefinedComponent = undefined;
           UndefinedComponent = <UndefinedComponent />;
-          assertConsoleErrorDev(
-            gate(flags => flags.enableOwnerStacks)
-              ? []
-              : [
-                  'React.jsx: type is invalid -- expected a string ' +
-                    '(for built-in components) or a class/function (for composite ' +
-                    'components) but got: undefined. You likely forgot to export your ' +
-                    "component from the file it's defined in, or you might have mixed up " +
-                    'default and named imports.',
-                ],
-            {withoutStack: true},
-          );
-
           await render(UndefinedComponent);
         },
         'Element type is invalid: expected a string (for built-in components) or a class/function ' +

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

@@ -286,7 +286,6 @@ describe('ReactDOMServerLifecycles', () => {
         'usually means you called setState() outside componentWillMount() on ' +
         'the server. This is a no-op.\n\n' +
         'Please check the code for the Outer component.\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Inner (at **)\n') +
         '    in Outer (at **)',
     ]);
   });

packages/react-dom/src/__tests__/ReactDOMServerPartialHydration-test.internal.js

@@ -1923,11 +1923,6 @@ describe('ReactDOMServerPartialHydration', () => {
         "Can't perform a React state update on a component that hasn't mounted yet. " +
           'This indicates that you have a side-effect in your render function that ' +
           'asynchronously later calls tries to update the component. Move this work to useEffect instead.\n' +
-          (gate('enableOwnerStacks')
-            ? ''
-            : '    in Child (at **)\n' +
-              '    in Suspense (at **)\n' +
-              '    in div (at **)\n') +
           '    in App (at **)',
       ]);
 

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

@@ -171,8 +171,7 @@ describe('ReactDOM HostSingleton', () => {
         'children of these components will likely fail in unpredictable ways. ' +
         'Please only render a single instance of <head> and if you need to mount a new one, ' +
         'ensure any previous ones have unmounted first.\n' +
-        '    in head (at **)' +
+        '    in head (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in html (at **)'),
     ]);
     expect(getVisibleChildren(document)).toEqual(
       <html>

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

@@ -60,11 +60,13 @@ describe('ReactDeprecationWarnings', () => {
       </div>,
     );
     await waitForAll([]);
-    assertConsoleErrorDev([
+    assertConsoleErrorDev(
-      'FunctionalComponent: Support for defaultProps ' +
+      [
-        'will be removed from memo components in a future major ' +
+        'FunctionalComponent: Support for defaultProps ' +
-        'release. Use JavaScript default parameters instead.\n' +
+          'will be removed from memo components in a future major ' +
-        '    in div (at **)',
+          'release. Use JavaScript default parameters instead.',
-    ]);
+      ],
+      {withoutStack: true},
+    );
   });
 });

packages/react-dom/src/__tests__/ReactErrorBoundaries-test.internal.js

@@ -2381,17 +2381,6 @@ describe('ReactErrorBoundaries', () => {
         'class/function (for composite components) but got: null.',
     );
 
-    if (!gate('enableOwnerStacks')) {
-      assertConsoleErrorDev(
-        [
-          'React.jsx: type is invalid -- expected a string ' +
-            '(for built-in components) or a class/function ' +
-            '(for composite components) but got: null.',
-        ],
-        {withoutStack: true},
-      );
-    }
-
     await expect(async () => {
       const container = document.createElement('div');
       const root = ReactDOMClient.createRoot(container);
@@ -2403,18 +2392,6 @@ describe('ReactErrorBoundaries', () => {
         'expected a string (for built-in components) or a ' +
         'class/function (for composite components) but got: undefined.',
     );
-    if (!gate('enableOwnerStacks')) {
-      assertConsoleErrorDev(
-        [
-          'React.jsx: type is invalid -- expected a string ' +
-            '(for built-in components) or a class/function ' +
-            '(for composite components) but got: undefined. ' +
-            "You likely forgot to export your component from the file it's defined in, " +
-            'or you might have mixed up default and named imports.',
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   it('renders empty output if error boundary does not handle the error', async () => {

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

@@ -116,7 +116,6 @@ describe('ReactFunctionComponent', () => {
         '    in GrandParent (at **)',
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Child (at **)\n') +
         '    in Parent (at **)\n' +
         '    in GrandParent (at **)',
     ]);
@@ -260,7 +259,6 @@ describe('ReactFunctionComponent', () => {
         '    in Parent (at **)',
       'Child uses the legacy contextTypes API which will be removed soon. ' +
         'Use React.createContext() with React.useContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in Child (at **)\n' +
         '    in Parent (at **)',
     ]);
     expect(el.textContent).toBe('en');

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

@@ -121,13 +121,9 @@ describe('ReactLegacyCompositeComponent', () => {
     assertConsoleErrorDev([
       'Child uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Child (at **)\n') +
         '    in Parent (at **)',
       'Grandchild uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Grandchild (at **)\n' + '    in Child (at **)\n') +
         '    in Parent (at **)',
     ]);
     expect(findDOMNode(component).innerHTML).toBe('bar');
@@ -200,10 +196,7 @@ describe('ReactLegacyCompositeComponent', () => {
         '    in Parent (at **)',
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in Child (at **)' +
+        '    in Child (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in Middle (at **)' + '\n    in Parent (at **)'),
     ]);
 
     await act(() => {
@@ -268,15 +261,9 @@ describe('ReactLegacyCompositeComponent', () => {
     assertConsoleErrorDev([
       'Parent uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Parent (at **)\n') +
         '    in Wrapper (at **)',
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Child (at **)\n' +
-            '    in div (at **)\n' +
-            '    in Parent (at **)\n') +
         '    in Wrapper (at **)',
     ]);
 
@@ -361,15 +348,12 @@ describe('ReactLegacyCompositeComponent', () => {
         '    in Parent (at **)',
       'Child uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Child (at **)\n') +
         '    in Parent (at **)',
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Child (at **)\n') +
         '    in Parent (at **)',
       'Grandchild uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Grandchild (at **)\n') +
         '    in Child (at **)\n' +
         '    in Parent (at **)',
     ]);
@@ -441,7 +425,6 @@ describe('ReactLegacyCompositeComponent', () => {
     assertConsoleErrorDev([
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Child (at **)\n') +
         '    in Parent (at **)',
     ]);
 

packages/react-dom/src/__tests__/ReactLegacyContextDisabled-test.internal.js

@@ -104,16 +104,10 @@ describe('ReactLegacyContextDisabled', () => {
         '    in LegacyProvider (at **)',
       'LegacyClsConsumer uses the legacy contextTypes API which was removed in React 19. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in LegacyClsConsumer (at **)' +
+        '    in LegacyClsConsumer (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n' + '    in span (at **)\n' + '    in LegacyProvider (at **)'),
       'LegacyFnConsumer uses the legacy contextTypes API which was removed in React 19. ' +
         'Use React.createContext() with React.useContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in LegacyFnConsumer (at **)' +
+        '    in LegacyFnConsumer (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n' + '    in span (at **)\n' + '    in LegacyProvider (at **)'),
     ]);
     expect(container.textContent).toBe('{}undefinedundefined');
     expect(lifecycleContextLog).toEqual([]);
@@ -151,16 +145,10 @@ describe('ReactLegacyContextDisabled', () => {
         '    in LegacyProvider (at **)',
       'LegacyClsConsumer uses the legacy contextTypes API which was removed in React 19. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in LegacyClsConsumer (at **)' +
+        '    in LegacyClsConsumer (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n' + '    in span (at **)\n' + '    in LegacyProvider (at **)'),
       'LegacyFnConsumer uses the legacy contextTypes API which was removed in React 19. ' +
         'Use React.createContext() with React.useContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in LegacyFnConsumer (at **)' +
+        '    in LegacyFnConsumer (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n' + '    in span (at **)\n' + '    in LegacyProvider (at **)'),
     ]);
     expect(text).toBe('<span>{}<!-- -->undefined<!-- -->undefined</span>');
     expect(lifecycleContextLog).toEqual([{}, {}, {}]);

packages/react-dom/src/__tests__/ReactLegacyErrorBoundaries-test.internal.js

@@ -2112,16 +2112,6 @@ describe('ReactLegacyErrorBoundaries', () => {
         ReactDOM.render(<X />, container);
       });
     }).rejects.toThrow('got: null');
-    if (gate(flags => !flags.enableOwnerStacks)) {
-      assertConsoleErrorDev(
-        [
-          'React.jsx: type is invalid -- expected a string ' +
-            '(for built-in components) or a class/function ' +
-            '(for composite components) but got: null.',
-        ],
-        {withoutStack: true},
-      );
-    }
 
     await expect(async () => {
       const container = document.createElement('div');
@@ -2129,16 +2119,6 @@ describe('ReactLegacyErrorBoundaries', () => {
         ReactDOM.render(<Y />, container);
       });
     }).rejects.toThrow('got: undefined');
-    if (gate(flags => !flags.enableOwnerStacks)) {
-      assertConsoleErrorDev(
-        [
-          'React.jsx: type is invalid -- expected a string ' +
-            '(for built-in components) or a class/function ' +
-            '(for composite components) but got: undefined.',
-        ],
-        {withoutStack: true},
-      );
-    }
   });
 
   // @gate !disableLegacyMode

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

@@ -228,13 +228,7 @@ describe('ReactMultiChild', () => {
           'across updates. Non-unique keys may cause children to be ' +
           'duplicated and/or omitted — the behavior is unsupported and ' +
           'could change in a future version.\n' +
-          '    in div (at **)' +
+          '    in div (at **)',
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '\n    in div (at **)' +
-              '\n    in WrapperComponent (at **)' +
-              '\n    in div (at **)' +
-              '\n    in Parent (at **)'),
       ]);
     });
 
@@ -290,13 +284,7 @@ describe('ReactMultiChild', () => {
           'across updates. Non-unique keys may cause children to be ' +
           'duplicated and/or omitted — the behavior is unsupported and ' +
           'could change in a future version.\n' +
-          '    in div (at **)' +
+          '    in div (at **)',
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '\n    in div (at **)' +
-              '\n    in WrapperComponent (at **)' +
-              '\n    in div (at **)' +
-              '\n    in Parent (at **)'),
       ]);
     });
   });

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

@@ -758,20 +758,12 @@ describe('ReactDOMServer', () => {
       '<inPUT /> is using incorrect casing. ' +
         'Use PascalCase for React components, ' +
         'or lowercase for HTML elements.\n' +
-        '    in inPUT (at **)' +
+        '    in inPUT (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in div (at **)'),
       // linearGradient doesn't warn
       '<iFrame /> is using incorrect casing. ' +
         'Use PascalCase for React components, ' +
         'or lowercase for HTML elements.\n' +
-        '    in iFrame (at **)' +
+        '    in iFrame (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in foreignObject (at **)' +
-            '\n    in g (at **)' +
-            '\n    in CompositeG (at **)' +
-            '\n    in svg (at **)' +
-            '\n    in div (at **)'),
     ]);
   });
 
@@ -869,30 +861,14 @@ describe('ReactDOMServer', () => {
     ReactDOMServer.renderToString(<App />);
     assertConsoleErrorDev([
       'Invalid ARIA attribute `ariaTypo`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in span (at **)\n' +
-          ? '    in span (at **)\n' +
+        '    in B (at **)\n' +
-            '    in B (at **)\n' +
+        '    in Child (at **)\n' +
-            '    in Child (at **)\n' +
+        '    in App (at **)',
-            '    in App (at **)'
-          : '    in span (at **)\n' +
-            '    in b (at **)\n' +
-            '    in C (at **)\n' +
-            '    in font (at **)\n' +
-            '    in B (at **)\n' +
-            '    in Child (at **)\n' +
-            '    in span (at **)\n' +
-            '    in div (at **)\n' +
-            '    in App (at **)'),
       'Invalid ARIA attribute `ariaTypo2`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in span (at **)\n' +
-          ? '    in span (at **)\n' +
+        '    in Child (at **)\n' +
-            '    in Child (at **)\n' +
+        '    in App (at **)',
-            '    in App (at **)'
-          : '    in span (at **)\n' +
-            '    in Child (at **)\n' +
-            '    in span (at **)\n' +
-            '    in div (at **)\n' +
-            '    in App (at **)'),
     ]);
   });
 
@@ -929,47 +905,30 @@ describe('ReactDOMServer', () => {
     assertConsoleErrorDev([
       // ReactDOMServer(App > div > span)
       'Invalid ARIA attribute `ariaTypo`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in span (at **)\n' +
-          ? '    in span (at **)\n' + '    in App (at **)'
+        '    in App (at **)',
-          : '    in span (at **)\n' +
-            '    in div (at **)\n' +
-            '    in App (at **)'),
       // ReactDOMServer(App > div > Child) >>> ReactDOMServer(App2) >>> ReactDOMServer(blink)
       'Invalid ARIA attribute `ariaTypo2`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in blink (at **)\n' +
-          ? '    in blink (at **)\n' +
+        '    in App2 (at **)\n' +
-            '    in App2 (at **)\n' +
+        '    in Child (at **)\n' +
-            '    in Child (at **)\n' +
+        '    in App (at **)',
-            '    in App (at **)'
-          : '    in blink (at **)'),
       // ReactDOMServer(App > div > Child) >>> ReactDOMServer(App2 > Child2 > span)
       'Invalid ARIA attribute `ariaTypo3`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in span (at **)\n' +
-          ? '    in span (at **)\n' +
+        '    in Child2 (at **)\n' +
-            '    in Child2 (at **)\n' +
+        '    in App2 (at **)\n' +
-            '    in App2 (at **)\n' +
+        '    in Child (at **)\n' +
-            '    in Child (at **)\n' +
+        '    in App (at **)',
-            '    in App (at **)'
-          : '    in span (at **)\n' +
-            '    in Child2 (at **)\n' +
-            '    in App2 (at **)'),
       // ReactDOMServer(App > div > Child > span)
       'Invalid ARIA attribute `ariaTypo4`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in span (at **)\n' +
-          ? '    in span (at **)\n' +
+        '    in Child (at **)\n' +
-            '    in Child (at **)\n' +
+        '    in App (at **)',
-            '    in App (at **)'
-          : '    in span (at **)\n' +
-            '    in Child (at **)\n' +
-            '    in div (at **)\n' +
-            '    in App (at **)'),
       // ReactDOMServer(App > div > font)
       'Invalid ARIA attribute `ariaTypo5`. ARIA attributes follow the pattern aria-* and must be lowercase.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in font (at **)\n' +
-          ? '    in font (at **)\n' + '    in App (at **)'
+        '    in App (at **)',
-          : '    in font (at **)\n' +
-            '    in div (at **)\n' +
-            '    in App (at **)'),
     ]);
   });
 

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

@@ -1877,9 +1877,7 @@ describe('ReactUpdates', () => {
       const originalConsoleError = console.error;
       console.error = e => {
         error = e;
-        ownerStack = gate(flags => flags.enableOwnerStacks)
+        ownerStack = React.captureOwnerStack();
-          ? React.captureOwnerStack()
-          : null;
         debugStack = new Error().stack;
         Scheduler.log('stop');
       };
@@ -1895,11 +1893,7 @@ describe('ReactUpdates', () => {
       expect(error).toContain('Maximum update depth exceeded');
       // The currently executing effect should be on the native stack
       expect(debugStack).toContain('at myEffect');
-      if (gate(flags => flags.enableOwnerStacks)) {
+      expect(ownerStack).toContain('at App');
-        expect(ownerStack).toContain('at App');
-      } else {
-        expect(ownerStack).toBe(null);
-      }
     });
 
     it('can have nested updates if they do not cross the limit', async () => {

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

@@ -121,34 +121,20 @@ describe('validateDOMNesting', () => {
     );
     expectWarnings(
       ['div', 'ul', 'li', 'div', 'li'],
-      gate(flags => flags.enableOwnerStacks)
+
-        ? [
+      [
-            'In HTML, <li> cannot be a descendant of <li>.\n' +
+        'In HTML, <li> cannot be a descendant of <li>.\n' +
-              'This will cause a hydration error.\n' +
+          'This will cause a hydration error.\n' +
-              '\n' +
+          '\n' +
-              '  <ul>\n' +
+          '  <ul>\n' +
-              '>   <li>\n' +
+          '>   <li>\n' +
-              '      <div>\n' +
+          '      <div>\n' +
-              '>       <li>\n' +
+          '>       <li>\n' +
-              '\n' +
+          '\n' +
-              '    in li (at **)',
+          '    in li (at **)',
-            '<li> cannot contain a nested <li>.\nSee this log for the ancestor stack trace.\n' +
+        '<li> cannot contain a nested <li>.\nSee this log for the ancestor stack trace.\n' +
-              '    in li (at **)',
+          '    in li (at **)',
-          ]
+      ],
-        : [
-            'In HTML, <li> cannot be a descendant of <li>.\n' +
-              'This will cause a hydration error.\n' +
-              '\n' +
-              '  <ul>\n' +
-              '>   <li>\n' +
-              '      <div>\n' +
-              '>       <li>\n' +
-              '\n' +
-              '    in li (at **)\n' +
-              '    in div (at **)\n' +
-              '    in li (at **)\n' +
-              '    in ul (at **)',
-          ],
     );
     expectWarnings(
       ['div', 'html'],
@@ -208,28 +194,16 @@ describe('validateDOMNesting', () => {
     );
     expectWarnings(
       ['svg', 'foreignObject', 'body', 'p'],
-      gate(flags => flags.enableOwnerStacks)
+      [
-        ? [
+        // TODO, this should say "In SVG",
-            // TODO, this should say "In SVG",
+        'In HTML, <body> cannot be a child of <foreignObject>.\n' +
-            'In HTML, <body> cannot be a child of <foreignObject>.\n' +
+          'This will cause a hydration error.\n' +
-              'This will cause a hydration error.\n' +
+          '\n' +
-              '\n' +
+          '> <foreignObject>\n' +
-              '> <foreignObject>\n' +
+          '>   <body>\n' +
-              '>   <body>\n' +
+          '\n' +
-              '\n' +
+          '    in body (at **)',
-              '    in body (at **)',
+      ],
-          ]
-        : [
-            // TODO, this should say "In SVG",
-            'In HTML, <body> cannot be a child of <foreignObject>.\n' +
-              'This will cause a hydration error.\n' +
-              '\n' +
-              '> <foreignObject>\n' +
-              '>   <body>\n' +
-              '\n' +
-              '    in body (at **)\n' +
-              '    in foreignObject (at **)',
-          ],
     );
   });
 

packages/react-markup/src/__tests__/ReactMarkupClient-test.js

@@ -233,9 +233,7 @@ if (!__EXPERIMENTAL__) {
           '\n    in div (at **)',
       );
       expect(normalizeCodeLocInfo(caughtErrors[0].ownerStack)).toBe(
-        __DEV__ && gate(flags => flags.enableOwnerStacks)
+        __DEV__ ? '\n    in Bar (at **)' + '\n    in Foo (at **)' : null,
-          ? '\n    in Bar (at **)' + '\n    in Foo (at **)'
-          : null,
       );
     });
   });

packages/react-markup/src/__tests__/ReactMarkupServer-test.js

@@ -269,9 +269,7 @@ if (!__EXPERIMENTAL__) {
           : '\n    in div (at **)' + '\n    in div (at **)',
       );
       expect(normalizeCodeLocInfo(caughtErrors[0].ownerStack)).toBe(
-        __DEV__ && gate(flags => flags.enableOwnerStacks)
+        __DEV__ ? '\n    in Bar (at **)' + '\n    in Foo (at **)' : null,
-          ? '\n    in Bar (at **)' + '\n    in Foo (at **)'
-          : null,
       );
     });
   });

packages/react-native-renderer/src/__tests__/ReactFabric-test.internal.js

@@ -875,10 +875,7 @@ describe('ReactFabric', () => {
     });
     assertConsoleErrorDev([
       'Text strings must be rendered within a <Text> component.\n' +
-        '    in RCTScrollView (at **)' +
+        '    in RCTScrollView (at **)',
-        (gate(flags => !flags.enableOwnerStacks)
-          ? '\n    in RCTText (at **)'
-          : ''),
     ]);
   });
 

packages/react-native-renderer/src/legacy-events/EventPluginUtils.js

@@ -7,8 +7,6 @@
 
 import isArray from 'shared/isArray';
 
-import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
-
 import {runWithFiberInDEV} from 'react-reconciler/src/ReactCurrentFiber';
 
 let hasError = false;
@@ -99,7 +97,7 @@ export function executeDispatchesInOrder(event) {
       // Listeners and Instances are two parallel arrays that are always in sync.
       const listener = dispatchListeners[i];
       const instance = dispatchInstances[i];
-      if (__DEV__ && enableOwnerStacks && instance !== null) {
+      if (__DEV__ && instance !== null) {
         runWithFiberInDEV(instance, executeDispatch, event, listener, instance);
       } else {
         executeDispatch(event, listener, instance);
@@ -108,7 +106,7 @@ export function executeDispatchesInOrder(event) {
   } else if (dispatchListeners) {
     const listener = dispatchListeners;
     const instance = dispatchInstances;
-    if (__DEV__ && enableOwnerStacks && instance !== null) {
+    if (__DEV__ && instance !== null) {
       runWithFiberInDEV(instance, executeDispatch, event, listener, instance);
     } else {
       executeDispatch(event, listener, instance);

packages/react-reconciler/src/ReactChildFiber.js

@@ -47,7 +47,6 @@ import isArray from 'shared/isArray';
 import {
   enableAsyncIterableChildren,
   disableLegacyMode,
-  enableOwnerStacks,
 } from 'shared/ReactFeatureFlags';
 
 import {
@@ -488,9 +487,7 @@ function createChildReconciler(
       if (__DEV__) {
         // We treat the parent as the owner for stack purposes.
         created._debugOwner = returnFiber;
-        if (enableOwnerStacks) {
+        created._debugTask = returnFiber._debugTask;
-          created._debugTask = returnFiber._debugTask;
-        }
         created._debugInfo = currentDebugInfo;
       }
       return created;
@@ -609,9 +606,7 @@ function createChildReconciler(
       if (__DEV__) {
         // We treat the parent as the owner for stack purposes.
         created._debugOwner = returnFiber;
-        if (enableOwnerStacks) {
+        created._debugTask = returnFiber._debugTask;
-          created._debugTask = returnFiber._debugTask;
-        }
         created._debugInfo = currentDebugInfo;
       }
       return created;
@@ -649,9 +644,7 @@ function createChildReconciler(
       if (__DEV__) {
         // We treat the parent as the owner for stack purposes.
         created._debugOwner = returnFiber;
-        if (enableOwnerStacks) {
+        created._debugTask = returnFiber._debugTask;
-          created._debugTask = returnFiber._debugTask;
-        }
         created._debugInfo = currentDebugInfo;
       }
       return created;
@@ -718,9 +711,7 @@ function createChildReconciler(
         if (__DEV__) {
           // We treat the parent as the owner for stack purposes.
           created._debugOwner = returnFiber;
-          if (enableOwnerStacks) {
+          created._debugTask = returnFiber._debugTask;
-            created._debugTask = returnFiber._debugTask;
-          }
           const prevDebugInfo = pushDebugInfo(newChild._debugInfo);
           created._debugInfo = currentDebugInfo;
           currentDebugInfo = prevDebugInfo;
@@ -1605,9 +1596,7 @@ function createChildReconciler(
     if (__DEV__) {
       // We treat the parent as the owner for stack purposes.
       created._debugOwner = returnFiber;
-      if (enableOwnerStacks) {
+      created._debugTask = returnFiber._debugTask;
-        created._debugTask = returnFiber._debugTask;
-      }
       created._debugInfo = currentDebugInfo;
     }
     return created;
@@ -1685,9 +1674,7 @@ function createChildReconciler(
       if (__DEV__) {
         // We treat the parent as the owner for stack purposes.
         created._debugOwner = returnFiber;
-        if (enableOwnerStacks) {
+        created._debugTask = returnFiber._debugTask;
-          created._debugTask = returnFiber._debugTask;
-        }
         created._debugInfo = currentDebugInfo;
       }
       validateFragmentProps(element, created, returnFiber);
@@ -1980,16 +1967,12 @@ function createChildReconciler(
         // thing when it's thrown from the same async component but not if you await
         // a promise started from a different component/task.
         throwFiber._debugOwner = returnFiber._debugOwner;
-        if (enableOwnerStacks) {
+        throwFiber._debugTask = returnFiber._debugTask;
-          throwFiber._debugTask = returnFiber._debugTask;
-        }
         if (debugInfo != null) {
           for (let i = debugInfo.length - 1; i >= 0; i--) {
             if (typeof debugInfo[i].stack === 'string') {
               throwFiber._debugOwner = (debugInfo[i]: any);
-              if (enableOwnerStacks) {
+              throwFiber._debugTask = debugInfo[i].debugTask;
-                throwFiber._debugTask = debugInfo[i].debugTask;
-              }
               break;
             }
           }

packages/react-reconciler/src/ReactCurrentFiber.js

@@ -10,12 +10,8 @@
 import type {Fiber} from './ReactInternalTypes';
 
 import ReactSharedInternals from 'shared/ReactSharedInternals';
-import {
+import {getOwnerStackByFiberInDev} from './ReactFiberComponentStack';
-  getStackByFiberInDevAndProd,
-  getOwnerStackByFiberInDev,
-} from './ReactFiberComponentStack';
 import {getComponentNameFromOwner} from 'react-reconciler/src/getComponentNameFromFiber';
-import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
 
 export let current: Fiber | null = null;
 export let isRendering: boolean = false;
@@ -42,10 +38,7 @@ function getCurrentFiberStackInDev(): string {
     // and it is guaranteed to be the work-in-progress version.
     // TODO: The above comment is not actually true. We might be
     // in a commit phase or preemptive set state callback.
-    if (enableOwnerStacks) {
+    return getOwnerStackByFiberInDev(current);
-      return getOwnerStackByFiberInDev(current);
-    }
-    return getStackByFiberInDevAndProd(current);
   }
   return '';
 }
@@ -63,12 +56,10 @@ export function runWithFiberInDEV<A0, A1, A2, A3, A4, T>(
     const previousFiber = current;
     setCurrentFiber(fiber);
     try {
-      if (enableOwnerStacks) {
+      if (fiber !== null && fiber._debugTask) {
-        if (fiber !== null && fiber._debugTask) {
+        return fiber._debugTask.run(
-          return fiber._debugTask.run(
+          callback.bind(null, arg0, arg1, arg2, arg3, arg4),
-            callback.bind(null, arg0, arg1, arg2, arg3, arg4),
+        );
-          );
-        }
       }
       return callback(arg0, arg1, arg2, arg3, arg4);
     } finally {

packages/react-reconciler/src/ReactFiber.js

@@ -40,7 +40,6 @@ import {
   enableRenderableContext,
   disableLegacyMode,
   enableObjectFiber,
-  enableOwnerStacks,
   enableViewTransition,
 } from 'shared/ReactFeatureFlags';
 import {NoFlags, Placement, StaticMask} from './ReactFiberFlags';
@@ -202,10 +201,8 @@ function FiberNode(
     // This isn't directly used but is handy for debugging internals:
     this._debugInfo = null;
     this._debugOwner = null;
-    if (enableOwnerStacks) {
+    this._debugStack = null;
-      this._debugStack = null;
+    this._debugTask = null;
-      this._debugTask = null;
-    }
     this._debugNeedsRemount = false;
     this._debugHookTypes = null;
     if (!hasBadMapPolyfill && typeof Object.preventExtensions === 'function') {
@@ -293,10 +290,8 @@ function createFiberImplObject(
     // This isn't directly used but is handy for debugging internals:
     fiber._debugInfo = null;
     fiber._debugOwner = null;
-    if (enableOwnerStacks) {
+    fiber._debugStack = null;
-      fiber._debugStack = null;
+    fiber._debugTask = null;
-      fiber._debugTask = null;
-    }
     fiber._debugNeedsRemount = false;
     fiber._debugHookTypes = null;
     if (!hasBadMapPolyfill && typeof Object.preventExtensions === 'function') {
@@ -352,10 +347,8 @@ export function createWorkInProgress(current: Fiber, pendingProps: any): Fiber {
       // DEV-only fields
 
       workInProgress._debugOwner = current._debugOwner;
-      if (enableOwnerStacks) {
+      workInProgress._debugStack = current._debugStack;
-        workInProgress._debugStack = current._debugStack;
+      workInProgress._debugTask = current._debugTask;
-        workInProgress._debugTask = current._debugTask;
-      }
       workInProgress._debugHookTypes = current._debugHookTypes;
     }
 
@@ -766,10 +759,8 @@ export function createFiberFromElement(
   );
   if (__DEV__) {
     fiber._debugOwner = element._owner;
-    if (enableOwnerStacks) {
+    fiber._debugStack = element._debugStack;
-      fiber._debugStack = element._debugStack;
+    fiber._debugTask = element._debugTask;
-      fiber._debugTask = element._debugTask;
-    }
   }
   return fiber;
 }

packages/react-reconciler/src/ReactFiberBeginWork.js

@@ -114,7 +114,6 @@ import {
   enableRenderableContext,
   disableLegacyMode,
   disableDefaultPropsExceptForClasses,
-  enableOwnerStacks,
   enableHydrationLaneScheduling,
   enableViewTransition,
 } from 'shared/ReactFeatureFlags';
@@ -3782,10 +3781,8 @@ function beginWork(
         workInProgress.mode,
         workInProgress.lanes,
       );
-      if (enableOwnerStacks) {
+      copiedFiber._debugStack = workInProgress._debugStack;
-        copiedFiber._debugStack = workInProgress._debugStack;
+      copiedFiber._debugTask = workInProgress._debugTask;
-        copiedFiber._debugTask = workInProgress._debugTask;
-      }
       return remountFiber(current, workInProgress, copiedFiber);
     }
   }

packages/react-reconciler/src/ReactFiberComponentStack.js

@@ -7,10 +7,7 @@
  * @flow
  */
 
-import {
+import {enableViewTransition} from 'shared/ReactFeatureFlags';
-  enableOwnerStacks,
-  enableViewTransition,
-} from 'shared/ReactFeatureFlags';
 import type {Fiber} from './ReactInternalTypes';
 import type {ReactComponentInfo} from 'shared/ReactTypes';
 
@@ -101,7 +98,7 @@ function describeFunctionComponentFrameWithoutLineNumber(fn: Function): string {
 }
 
 export function getOwnerStackByFiberInDev(workInProgress: Fiber): string {
-  if (!enableOwnerStacks || !__DEV__) {
+  if (!__DEV__) {
     return '';
   }
   try {

packages/react-reconciler/src/ReactFiberErrorLogger.js

@@ -18,8 +18,6 @@ import reportGlobalError from 'shared/reportGlobalError';
 
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 
-import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
-
 import {bindToConsole} from './ReactFiberConfig';
 
 // Side-channel since I'm not sure we want to make this part of the public API
@@ -46,18 +44,6 @@ export function defaultOnUncaughtError(
       'Consider adding an error boundary to your tree to customize error handling behavior.\n' +
       'Visit https://react.dev/link/error-boundaries to learn more about error boundaries.';
 
-    const prevGetCurrentStack = ReactSharedInternals.getCurrentStack;
-    if (!enableOwnerStacks) {
-      // The current Fiber is disconnected at this point which means that console printing
-      // cannot add a component stack since it terminates at the deletion node. This is not
-      // a problem for owner stacks which are not disconnected but for the parent component
-      // stacks we need to use the snapshot we've previously extracted.
-      const componentStack =
-        errorInfo.componentStack != null ? errorInfo.componentStack : '';
-      ReactSharedInternals.getCurrentStack = function () {
-        return componentStack;
-      };
-    }
     try {
       console.warn(
         '%s\n\n%s\n',
@@ -66,9 +52,7 @@ export function defaultOnUncaughtError(
         // We let our console.error wrapper add the component stack to the end.
       );
     } finally {
-      if (!enableOwnerStacks) {
+      // ignore
-        ReactSharedInternals.getCurrentStack = prevGetCurrentStack;
-      }
     }
   }
 }
@@ -97,18 +81,6 @@ export function defaultOnCaughtError(
         errorBoundaryName || 'Anonymous'
       }.`;
 
-    const prevGetCurrentStack = ReactSharedInternals.getCurrentStack;
-    if (!enableOwnerStacks) {
-      // The current Fiber is disconnected at this point which means that console printing
-      // cannot add a component stack since it terminates at the deletion node. This is not
-      // a problem for owner stacks which are not disconnected but for the parent component
-      // stacks we need to use the snapshot we've previously extracted.
-      const componentStack =
-        errorInfo.componentStack != null ? errorInfo.componentStack : '';
-      ReactSharedInternals.getCurrentStack = function () {
-        return componentStack;
-      };
-    }
     try {
       if (
         typeof error === 'object' &&
@@ -138,9 +110,7 @@ export function defaultOnCaughtError(
         );
       }
     } finally {
-      if (!enableOwnerStacks) {
+      // ignore
-        ReactSharedInternals.getCurrentStack = prevGetCurrentStack;
-      }
     }
   } else {
     // In production, we print the error directly.

packages/react-reconciler/src/__tests__/ErrorBoundaryReconciliation-test.internal.js

@@ -6,7 +6,6 @@ describe('ErrorBoundaryReconciliation', () => {
   let ReactTestRenderer;
   let span;
   let act;
-  let assertConsoleErrorDev;
 
   beforeEach(() => {
     jest.resetModules();
@@ -14,8 +13,6 @@ describe('ErrorBoundaryReconciliation', () => {
     ReactTestRenderer = require('react-test-renderer');
     React = require('react');
     act = require('internal-test-utils').act;
-    assertConsoleErrorDev =
-      require('internal-test-utils').assertConsoleErrorDev;
     DidCatchErrorBoundary = class extends React.Component {
       state = {error: null};
       componentDidCatch(error) {
@@ -68,9 +65,6 @@ describe('ErrorBoundaryReconciliation', () => {
         </ErrorBoundary>,
       );
     });
-    if (gate(flags => !flags.enableOwnerStacks)) {
-      assertConsoleErrorDev(['invalid', 'invalid']);
-    }
 
     const Fallback = fallbackTagName;
     expect(renderer).toMatchRenderedOutput(<Fallback prop="ErrorBoundary" />);

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

@@ -168,9 +168,7 @@ describe('ReactFragment', () => {
         'Foo',
         'CatchingBoundary',
       ]),
-      gate(flags => flags.enableOwnerStacks) && __DEV__
+      __DEV__ ? componentStack(['Bar', 'Foo']) : null,
-        ? componentStack(['Bar', 'Foo'])
-        : null,
     ]);
   });
 });

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

@@ -744,19 +744,12 @@ describe('ReactFragment', () => {
     ReactNoop.render(<Foo condition={false} />);
     await waitForAll([]);
     assertConsoleErrorDev([
-      gate('enableOwnerStacks')
+      'Each child in a list should have a unique "key" prop.\n' +
-        ? 'Each child in a list should have a unique "key" prop.\n' +
+        '\n' +
-          '\n' +
+        'Check the render method of `div`. ' +
-          'Check the render method of `div`. ' +
+        'It was passed a child from Foo. ' +
-          'It was passed a child from Foo. ' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
+        '    in Foo (at **)',
-          '    in Foo (at **)'
-        : 'Each child in a list should have a unique "key" prop.\n' +
-          '\n' +
-          'Check the render method of `Foo`. ' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
-          '    in Stateful (at **)\n' +
-          '    in Foo (at **)',
     ]);
 
     expect(ops).toEqual([]);

packages/react-reconciler/src/__tests__/ReactHooks-test.internal.js

@@ -1236,24 +1236,20 @@ describe('ReactHooks', () => {
         'In classes, you can read it in the render method or getDerivedStateFromProps. ' +
         'In function components, you can read it directly in the function body, ' +
         'but not inside Hooks like useReducer() or useMemo().\n' +
-        '    in App (at **)' +
+        '    in App (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Boundary (at **)'),
       'Do not call Hooks inside useEffect(...), useMemo(...), or other built-in Hooks. ' +
         'You can only call Hooks at the top level of your React function. ' +
         'For more information, see https://react.dev/link/rules-of-hooks\n' +
-        '    in App (at **)' +
+        '    in App (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Boundary (at **)'),
       'Context can only be read while React is rendering. ' +
         'In classes, you can read it in the render method or getDerivedStateFromProps. ' +
         'In function components, you can read it directly in the function body, ' +
         'but not inside Hooks like useReducer() or useMemo().\n' +
-        '    in App (at **)' +
+        '    in App (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Boundary (at **)'),
       'Do not call Hooks inside useEffect(...), useMemo(...), or other built-in Hooks. ' +
         'You can only call Hooks at the top level of your React function. ' +
         'For more information, see https://react.dev/link/rules-of-hooks\n' +
-        '    in App (at **)' +
+        '    in App (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Boundary (at **)'),
     ]);
 
     function Valid() {
@@ -1293,24 +1289,20 @@ describe('ReactHooks', () => {
         'In classes, you can read it in the render method or getDerivedStateFromProps. ' +
         'In function components, you can read it directly in the function body, ' +
         'but not inside Hooks like useReducer() or useMemo().\n' +
-        '    in App (at **)' +
+        '    in App (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Boundary (at **)'),
       'Do not call Hooks inside useEffect(...), useMemo(...), or other built-in Hooks. ' +
         'You can only call Hooks at the top level of your React function. ' +
         'For more information, see https://react.dev/link/rules-of-hooks\n' +
-        '    in App (at **)' +
+        '    in App (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Boundary (at **)'),
       'Context can only be read while React is rendering. ' +
         'In classes, you can read it in the render method or getDerivedStateFromProps. ' +
         'In function components, you can read it directly in the function body, ' +
         'but not inside Hooks like useReducer() or useMemo().\n' +
-        '    in App (at **)' +
+        '    in App (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Boundary (at **)'),
       'Do not call Hooks inside useEffect(...), useMemo(...), or other built-in Hooks. ' +
         'You can only call Hooks at the top level of your React function. ' +
         'For more information, see https://react.dev/link/rules-of-hooks\n' +
-        '    in App (at **)' +
+        '    in App (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Boundary (at **)'),
     ]);
   });
 

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

@@ -1803,14 +1803,10 @@ describe('ReactIncremental', () => {
         '    in Intl (at **)',
       'ShowLocale uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in ShowLocale (at **)' +
+        '    in ShowLocale (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Intl (at **)'),
       'ShowBoth uses the legacy contextTypes API which will be removed soon. ' +
         'Use React.createContext() with React.useContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in ShowBoth (at **)' +
+        '    in ShowBoth (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in div (at **)' + '\n    in Intl (at **)'),
     ]);
 
     ReactNoop.render(
@@ -1865,16 +1861,10 @@ describe('ReactIncremental', () => {
     assertConsoleErrorDev([
       'Router uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in Router (at **)' +
+        '    in Router (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Intl (at **)'),
       'ShowRoute uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks')
+        '    in Indirection (at **)',
-          ? '    in Indirection (at **)'
-          : '    in ShowRoute (at **)\n' +
-            '    in Indirection (at **)\n' +
-            '    in Router (at **)\n' +
-            '    in Intl (at **)'),
     ]);
   });
 
@@ -1972,8 +1962,7 @@ describe('ReactIncremental', () => {
         '    in Intl (at **)',
       'ShowLocale uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in ShowLocale (at **)' +
+        '    in ShowLocale (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Intl (at **)'),
     ]);
 
     await waitForAll([
@@ -2068,22 +2057,10 @@ describe('ReactIncremental', () => {
         '    in Intl (at **)',
       'ShowLocaleClass uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in ShowLocaleClass (at **)' +
+        '    in ShowLocaleClass (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in Stateful (at **)' +
-            '\n    in IndirectionClass (at **)' +
-            '\n    in IndirectionFn (at **)' +
-            '    in Intl (at **)'),
       'ShowLocaleFn uses the legacy contextTypes API which will be removed soon. ' +
         'Use React.createContext() with React.useContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in ShowLocaleFn (at **)' +
+        '    in ShowLocaleFn (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in Stateful (at **)' +
-            '\n    in IndirectionClass (at **)' +
-            '\n    in IndirectionFn (at **)' +
-            '    in Intl (at **)'),
     ]);
 
     statefulInst.setState({x: 1});
@@ -2174,26 +2151,14 @@ describe('ReactIncremental', () => {
     assertConsoleErrorDev([
       'Intl uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Intl (at **)\n') +
         '    in Stateful (at **)',
       'ShowLocaleClass uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in ShowLocaleClass (at **)' +
+        '    in ShowLocaleClass (at **)',
-        (gate('enableOwnerStacks')
+
-          ? ''
-          : '\n    in IndirectionClass (at **)' +
-            '\n    in IndirectionFn (at **)' +
-            '\n    in Intl (at **)' +
-            '\n    in Stateful (at **)'),
       'ShowLocaleFn uses the legacy contextTypes API which will be removed soon. ' +
         'Use React.createContext() with React.useContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in ShowLocaleFn (at **)' +
+        '    in ShowLocaleFn (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in IndirectionClass (at **)' +
-            '\n    in IndirectionFn (at **)' +
-            '\n    in Intl (at **)' +
-            '\n    in Stateful (at **)'),
     ]);
 
     statefulInst.setState({locale: 'gr'});
@@ -2255,7 +2220,6 @@ describe('ReactIncremental', () => {
     assertConsoleErrorDev([
       'Child uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in Child (at **)\n') +
         '    in Middle (at **)\n' +
         '    in Root (at **)',
     ]);
@@ -2309,7 +2273,6 @@ describe('ReactIncremental', () => {
     assertConsoleErrorDev([
       'ContextProvider uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in ContextProvider (at **)\n') +
         '    in Root (at **)',
     ]);
 
@@ -2511,10 +2474,7 @@ describe('ReactIncremental', () => {
         '    in TopContextProvider (at **)',
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in Child (at **)' +
+        '    in Child (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in Middle (at **)' + '\n    in TopContextProvider (at **)'),
     ]);
     instance.updateCount();
     await waitForAll(['count:1']);
@@ -2578,17 +2538,10 @@ describe('ReactIncremental', () => {
         '    in TopContextProvider (at **)',
       'MiddleContextProvider uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in MiddleContextProvider (at **)' +
+        '    in MiddleContextProvider (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in TopContextProvider (at **)'),
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in Child (at **)' +
+        '    in Child (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in MiddleContextProvider (at **)' +
-            '\n    in TopContextProvider (at **)'),
     ]);
     instance.updateCount();
     await waitForAll(['count:1']);
@@ -2661,19 +2614,10 @@ describe('ReactIncremental', () => {
         '    in TopContextProvider (at **)',
       'MiddleContextProvider uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in MiddleContextProvider (at **)' +
+        '    in MiddleContextProvider (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in MiddleScu (at **)' +
-            '\n    in TopContextProvider (at **)'),
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in Child (at **)' +
+        '    in Child (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in MiddleContextProvider (at **)' +
-            '\n    in MiddleScu (at **)' +
-            '\n    in TopContextProvider (at **)'),
     ]);
     instance.updateCount();
     await waitForAll([]);
@@ -2756,19 +2700,10 @@ describe('ReactIncremental', () => {
         '    in TopContextProvider (at **)',
       'MiddleContextProvider uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in MiddleContextProvider (at **)' +
+        '    in MiddleContextProvider (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in MiddleScu (at **)' +
-            '\n    in TopContextProvider (at **)'),
       'Child uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        '    in Child (at **)' +
+        '    in Child (at **)',
-        (gate('enableOwnerStacks')
-          ? ''
-          : '\n    in MiddleContextProvider (at **)' +
-            '\n    in MiddleScu (at **)' +
-            '\n    in TopContextProvider (at **)'),
     ]);
     topInstance.updateCount();
     await waitForAll([]);

packages/react-reconciler/src/__tests__/ReactIncrementalErrorHandling-test.internal.js

@@ -1222,8 +1222,7 @@ describe('ReactIncrementalErrorHandling', () => {
         '    in Provider (at **)',
       'Connector uses the legacy contextTypes API which will be removed soon. ' +
         'Use React.createContext() with React.useContext() instead. (https://react.dev/link/legacy-context)\n' +
-        '    in Connector (at **)' +
+        '    in Connector (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in Provider (at **)'),
     ]);
 
     // If the context stack does not unwind, span will get 'abcde'
@@ -1254,23 +1253,6 @@ describe('ReactIncrementalErrorHandling', () => {
       </ErrorBoundary>,
     );
     await waitForAll([]);
-    if (gate(flags => !flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
-        'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-          'or a class/function (for composite components) but got: undefined. ' +
-          "You likely forgot to export your component from the file it's defined in, " +
-          'or you might have mixed up default and named imports.\n' +
-          '    in BrokenRender (at **)\n' +
-          '    in ErrorBoundary (at **)',
-        // React retries once on error
-        'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-          'or a class/function (for composite components) but got: undefined. ' +
-          "You likely forgot to export your component from the file it's defined in, " +
-          'or you might have mixed up default and named imports.\n' +
-          '    in BrokenRender (at **)\n' +
-          '    in ErrorBoundary (at **)',
-      ]);
-    }
 
     expect(ReactNoop).toMatchRenderedOutput(
       <span
@@ -1319,23 +1301,7 @@ describe('ReactIncrementalErrorHandling', () => {
       </ErrorBoundary>,
     );
     await waitForAll([]);
-    if (gate(flags => !flags.enableOwnerStacks)) {
+
-      assertConsoleErrorDev([
-        'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-          'or a class/function (for composite components) but got: undefined. ' +
-          "You likely forgot to export your component from the file it's defined in, " +
-          'or you might have mixed up default and named imports.\n' +
-          '    in BrokenRender (at **)\n' +
-          '    in ErrorBoundary (at **)',
-        // React retries once on error
-        'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-          'or a class/function (for composite components) but got: undefined. ' +
-          "You likely forgot to export your component from the file it's defined in, " +
-          'or you might have mixed up default and named imports.\n' +
-          '    in BrokenRender (at **)\n' +
-          '    in ErrorBoundary (at **)',
-      ]);
-    }
     expect(ReactNoop).toMatchRenderedOutput(
       <span
         prop={
@@ -1354,17 +1320,6 @@ describe('ReactIncrementalErrorHandling', () => {
   it('recovers from uncaught reconciler errors', async () => {
     const InvalidType = undefined;
     ReactNoop.render(<InvalidType />);
-    if (gate(flags => !flags.enableOwnerStacks)) {
-      assertConsoleErrorDev(
-        [
-          'React.jsx: type is invalid -- expected a string (for built-in components) ' +
-            'or a class/function (for composite components) but got: undefined. ' +
-            "You likely forgot to export your component from the file it's defined in, " +
-            'or you might have mixed up default and named imports.',
-        ],
-        {withoutStack: true},
-      );
-    }
 
     await waitForThrow(
       'Element type is invalid: expected a string (for built-in components) or ' +

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

@@ -94,11 +94,7 @@ describe('ReactIncrementalErrorLogging', () => {
         // The component stack is not added without the polyfill/devtools.
         // expect.stringMatching(
         //  new RegExp(
-        //    gate(flags => flags.enableOwnerStacks)
+        //    '\\s+(in|at) ErrorThrowingComponent'
-        //      ? '\\s+(in|at) ErrorThrowingComponent'
-        //      : '\\s+(in|at) ErrorThrowingComponent (.*)\n' +
-        //        '\\s+(in|at) span(.*)\n' +
-        //        '\\s+(in|at) div(.*)',
         //  ),
         // ),
       );
@@ -143,11 +139,7 @@ describe('ReactIncrementalErrorLogging', () => {
         // The component stack is not added without the polyfill/devtools.
         // expect.stringMatching(
         //   new RegExp(
-        //     gate(flags => flags.enableOwnerStacks)
+        //     '\\s+(in|at) ErrorThrowingComponent'
-        //       ? '\\s+(in|at) ErrorThrowingComponent'
-        //       : '\\s+(in|at) ErrorThrowingComponent (.*)\n' +
-        //         '\\s+(in|at) span(.*)\n' +
-        //         '\\s+(in|at) div(.*)',
         //   ),
         // ),
       );
@@ -204,12 +196,7 @@ describe('ReactIncrementalErrorLogging', () => {
         // The component stack is not added without the polyfill/devtools.
         // expect.stringMatching(
         //   new RegExp(
-        //     gate(flags => flags.enableOwnerStacks)
+        //     '\\s+(in|at) ErrorThrowingComponent'
-        //       ? '\\s+(in|at) ErrorThrowingComponent'
-        //       : '\\s+(in|at) ErrorThrowingComponent (.*)\n' +
-        //         '\\s+(in|at) span(.*)\n' +
-        //         '\\s+(in|at) ErrorBoundary(.*)\n' +
-        //         '\\s+(in|at) div(.*)',
         //   ),
         // ),
       );
@@ -287,11 +274,7 @@ describe('ReactIncrementalErrorLogging', () => {
         ),
         // The component stack is not added without the polyfill/devtools.
         // expect.stringMatching(
-        //   gate(flag => flag.enableOwnerStacks)
+        //   new RegExp('\\s+(in|at) Foo')
-        //     ? new RegExp('\\s+(in|at) Foo')
-        //     : new RegExp(
-        //         '\\s+(in|at) Foo (.*)\n' + '\\s+(in|at) ErrorBoundary(.*)',
-        //       ),
         // ),
       );
     } else {

packages/react-reconciler/src/__tests__/ReactLazy-test.internal.js

@@ -240,9 +240,6 @@ describe('ReactLazy', () => {
         '  }\n\n' +
         'Your code should look like: \n  ' +
         "const MyComponent = lazy(() => import('./MyComponent'))\n" +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Lazy (at **)\n' + '    in Suspense (at **)\n') +
         '    in App (at **)',
       'lazy: Expected the result of a dynamic import() call. ' +
         'Instead received: function Text(props) {\n' +
@@ -251,9 +248,6 @@ describe('ReactLazy', () => {
         '  }\n\n' +
         'Your code should look like: \n  ' +
         "const MyComponent = lazy(() => import('./MyComponent'))\n" +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Lazy (at **)\n' + '    in Suspense (at **)\n') +
         '    in App (at **)',
     ]);
     expect(root).not.toMatchRenderedOutput('Hi');
@@ -749,8 +743,7 @@ describe('ReactLazy', () => {
       'T: Support for defaultProps ' +
         'will be removed from function components in a future major ' +
         'release. Use JavaScript default parameters instead.\n' +
-        '    in T (at **)\n' +
+        '    in T (at **)',
-        '    in Suspense (at **)',
     ]);
 
     expect(root).toMatchRenderedOutput('Hi Bye');
@@ -855,11 +848,15 @@ describe('ReactLazy', () => {
     );
   });
 
-  async function verifyResolvesProps(
+  // @gate !disableDefaultPropsExceptForClasses
-    Add,
+  it('resolves props for function component with defaultProps', async () => {
-    shouldWarnAboutFunctionDefaultProps,
+    function Add(props) {
-    shouldWarnAboutMemoDefaultProps,
+      expect(props.innerWithDefault).toBe(42);
-  ) {
+      return props.inner + props.outer;
+    }
+    Add.defaultProps = {
+      innerWithDefault: 42,
+    };
     const LazyAdd = lazy(() => fakeImport(Add));
     const root = ReactTestRenderer.create(
       <Suspense fallback={<Text text="Loading..." />}>
@@ -876,18 +873,10 @@ describe('ReactLazy', () => {
     // Mount
     await act(() => resolveFakeImport(Add));
 
-    if (shouldWarnAboutFunctionDefaultProps) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      'Add: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.\n' +
-        'Add: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.\n' +
+        '    in Add (at **)',
-          '    in Add (at **)\n' +
+    ]);
-          '    in Suspense (at **)',
-      ]);
-    } else if (shouldWarnAboutMemoDefaultProps) {
-      assertConsoleErrorDev([
-        'Add: Support for defaultProps will be removed from memo components in a future major release. Use JavaScript default parameters instead.\n' +
-          '    in Suspense (at **)',
-      ]);
-    }
 
     expect(root).toMatchRenderedOutput('22');
 
@@ -899,25 +888,38 @@ describe('ReactLazy', () => {
     );
     await waitForAll([]);
     expect(root).toMatchRenderedOutput('0');
-  }
-
-  // @gate !disableDefaultPropsExceptForClasses
-  it('resolves props for function component with defaultProps', async () => {
-    function Add(props) {
-      expect(props.innerWithDefault).toBe(42);
-      return props.inner + props.outer;
-    }
-    Add.defaultProps = {
-      innerWithDefault: 42,
-    };
-    await verifyResolvesProps(Add, true);
   });
 
   it('resolves props for function component without defaultProps', async () => {
     function Add(props) {
       return props.inner + props.outer;
     }
-    await verifyResolvesProps(Add);
+    const LazyAdd = lazy(() => fakeImport(Add));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(Add));
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   it('resolves props for class component with defaultProps', async () => {
@@ -930,7 +932,32 @@ describe('ReactLazy', () => {
     Add.defaultProps = {
       innerWithDefault: 42,
     };
-    await verifyResolvesProps(Add);
+    const LazyAdd = lazy(() => fakeImport(Add));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(Add));
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   it('resolves props for class component without defaultProps', async () => {
@@ -939,7 +966,32 @@ describe('ReactLazy', () => {
         return this.props.inner + this.props.outer;
       }
     }
-    await verifyResolvesProps(Add);
+    const LazyAdd = lazy(() => fakeImport(Add));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(Add));
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   // @gate !disableDefaultPropsExceptForClasses
@@ -952,7 +1004,32 @@ describe('ReactLazy', () => {
     Add.defaultProps = {
       innerWithDefault: 42,
     };
-    await verifyResolvesProps(Add);
+    const LazyAdd = lazy(() => fakeImport(Add));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(Add));
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   it('resolves props for forwardRef component without defaultProps', async () => {
@@ -960,7 +1037,33 @@ describe('ReactLazy', () => {
       return props.inner + props.outer;
     });
     Add.displayName = 'Add';
-    await verifyResolvesProps(Add);
+
+    const LazyAdd = lazy(() => fakeImport(Add));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(Add));
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   // @gate !disableDefaultPropsExceptForClasses
@@ -973,7 +1076,39 @@ describe('ReactLazy', () => {
     Add.defaultProps = {
       innerWithDefault: 42,
     };
-    await verifyResolvesProps(Add, false, true);
+    const LazyAdd = lazy(() => fakeImport(Add));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(Add));
+
+    assertConsoleErrorDev(
+      [
+        'Add: Support for defaultProps will be removed from memo components in a future major release. Use JavaScript default parameters instead.',
+      ],
+      {withoutStack: true},
+    );
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   it('resolves props for outer memo component without defaultProps', async () => {
@@ -981,7 +1116,32 @@ describe('ReactLazy', () => {
       return props.inner + props.outer;
     };
     Add = React.memo(Add);
-    await verifyResolvesProps(Add);
+    const LazyAdd = lazy(() => fakeImport(Add));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(Add));
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   // @gate !disableDefaultPropsExceptForClasses
@@ -994,7 +1154,40 @@ describe('ReactLazy', () => {
     Add.defaultProps = {
       innerWithDefault: 42,
     };
-    await verifyResolvesProps(React.memo(Add), true);
+    const MemoAdd = React.memo(Add);
+    const LazyAdd = lazy(() => fakeImport(MemoAdd));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(MemoAdd));
+
+    assertConsoleErrorDev(
+      [
+        'Add: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.',
+      ],
+      {withoutStack: true},
+    );
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   it('resolves props for inner memo component without defaultProps', async () => {
@@ -1002,7 +1195,32 @@ describe('ReactLazy', () => {
       return props.inner + props.outer;
     };
     Add.displayName = 'Add';
-    await verifyResolvesProps(React.memo(Add));
+    const LazyAdd = lazy(() => fakeImport(Add));
+    const root = ReactTestRenderer.create(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner="2" outer="2" />
+      </Suspense>,
+      {
+        unstable_isConcurrent: true,
+      },
+    );
+
+    await waitForAll(['Loading...']);
+    expect(root).not.toMatchRenderedOutput('22');
+
+    // Mount
+    await act(() => resolveFakeImport(Add));
+
+    expect(root).toMatchRenderedOutput('22');
+
+    // Update
+    root.update(
+      <Suspense fallback={<Text text="Loading..." />}>
+        <LazyAdd inner={false} outer={false} />
+      </Suspense>,
+    );
+    await waitForAll([]);
+    expect(root).toMatchRenderedOutput('0');
   });
 
   // @gate !disableDefaultPropsExceptForClasses
@@ -1030,12 +1248,13 @@ describe('ReactLazy', () => {
     // Mount
     await act(() => resolveFakeImport(T));
     assertLog(['Inner default text']);
-    assertConsoleErrorDev([
+    assertConsoleErrorDev(
-      'T: Support for defaultProps will be removed from function components in a future major release. ' +
+      [
-        'Use JavaScript default parameters instead.\n' +
+        'T: Support for defaultProps will be removed from function components in a future major release. ' +
-        '    in T (at **)\n' +
+          'Use JavaScript default parameters instead.',
-        '    in Suspense (at **)',
+      ],
-    ]);
+      {withoutStack: true},
+    );
     expect(root).toMatchRenderedOutput('Inner default text');
 
     // Update
@@ -1074,11 +1293,7 @@ describe('ReactLazy', () => {
         '\n' +
         'Check the render method of `Foo`. ' +
         'See https://react.dev/link/warning-keys for more information.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in Foo (at **)',
-          ? '    in Foo (at **)'
-          : '    in Text (at **)\n' +
-            '    in Foo (at **)\n' +
-            '    in Suspense (at **)'),
     ]);
     expect(root).toMatchRenderedOutput(<div>AB</div>);
   });
@@ -1154,11 +1369,13 @@ describe('ReactLazy', () => {
 
     // Mount
     await act(() => resolveFakeImport(Add));
-    assertConsoleErrorDev([
+    assertConsoleErrorDev(
-      'Unknown: Support for defaultProps will be removed from memo components in a future major release. ' +
+      [
-        'Use JavaScript default parameters instead.\n' +
+        'Unknown: Support for defaultProps will be removed from memo components in a future major release. ' +
-        '    in Suspense (at **)',
+          'Use JavaScript default parameters instead.',
-    ]);
+      ],
+      {withoutStack: true},
+    );
     expect(root).toMatchRenderedOutput('4');
 
     // Update (shallowly equal)
@@ -1243,14 +1460,15 @@ describe('ReactLazy', () => {
 
     // Mount
     await act(() => resolveFakeImport(Add));
-    assertConsoleErrorDev([
+    assertConsoleErrorDev(
-      'Memo: Support for defaultProps will be removed from memo components in a future major release. ' +
+      [
-        'Use JavaScript default parameters instead.\n' +
+        'Memo: Support for defaultProps will be removed from memo components in a future major release. ' +
-        '    in Suspense (at **)',
+          'Use JavaScript default parameters instead.',
-      'Unknown: Support for defaultProps will be removed from memo components in a future major release. ' +
+        'Unknown: Support for defaultProps will be removed from memo components in a future major release. ' +
-        'Use JavaScript default parameters instead.\n' +
+          'Use JavaScript default parameters instead.',
-        '    in Suspense (at **)',
+      ],
-    ]);
+      {withoutStack: true},
+    );
     expect(root).toMatchRenderedOutput('4');
 
     // Update

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

@@ -407,12 +407,22 @@ describe('memo', () => {
           );
         });
         assertLog(['Loading...', 15]);
-        assertConsoleErrorDev([
+        if (label === 'lazy') {
-          'Counter: Support for defaultProps will be removed from memo components in a future major release. ' +
+          assertConsoleErrorDev(
-            'Use JavaScript default parameters instead.\n' +
+            [
-            (label === 'lazy' ? '' : '    in Indirection (at **)\n') +
+              'Counter: Support for defaultProps will be removed from memo components in a future major release. ' +
-            '    in Suspense (at **)',
+                'Use JavaScript default parameters instead.',
-        ]);
+            ],
+            {withoutStack: true},
+          );
+        } else {
+          assertConsoleErrorDev([
+            'Counter: Support for defaultProps will be removed from memo components in a future major release. ' +
+              'Use JavaScript default parameters instead.\n' +
+              '    in Indirection (at **)',
+          ]);
+        }
+
         expect(ReactNoop).toMatchRenderedOutput(<span prop={15} />);
 
         // Should bail out because props have not changed
@@ -475,12 +485,14 @@ describe('memo', () => {
             </div>,
           );
         });
-        assertConsoleErrorDev([
+        assertConsoleErrorDev(
-          'Inner: ' +
+          [
-            'Support for defaultProps will be removed from memo components in a future major release. ' +
+            'Inner: ' +
-            'Use JavaScript default parameters instead.\n' +
+              'Support for defaultProps will be removed from memo components in a future major release. ' +
-            '    in div (at **)',
+              'Use JavaScript default parameters instead.',
-        ]);
+          ],
+          {withoutStack: true},
+        );
         expect(root).toMatchRenderedOutput(<div>111</div>);
 
         await act(async () => {
@@ -576,9 +588,7 @@ describe('memo', () => {
         'Each child in a list should have a unique "key" prop. ' +
           'See https://react.dev/link/warning-keys for more information.\n' +
           '    in span (at **)\n' +
-          (gate('enableOwnerStacks')
+          '    in **/ReactMemo-test.js:**:** (at **)',
-            ? '    in **/ReactMemo-test.js:**:** (at **)'
-            : '    in p (at **)'),
       ]);
     });
 
@@ -597,8 +607,7 @@ describe('memo', () => {
           '\n\nCheck the top-level render call using <Inner>. It was passed a child from Inner. ' +
           'See https://react.dev/link/warning-keys for more information.\n' +
           '    in span (at **)\n' +
-          '    in Inner (at **)' +
+          '    in Inner (at **)',
-          (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in p (at **)'),
       ]);
     });
 
@@ -619,8 +628,7 @@ describe('memo', () => {
           '\n\nCheck the top-level render call using <Inner>. It was passed a child from Inner. ' +
           'See https://react.dev/link/warning-keys for more information.\n' +
           '    in span (at **)\n' +
-          '    in Inner (at **)' +
+          '    in Inner (at **)',
-          (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in p (at **)'),
       ]);
     });
 
@@ -640,8 +648,7 @@ describe('memo', () => {
           '\n\nCheck the top-level render call using <Outer>. It was passed a child from Outer. ' +
           'See https://react.dev/link/warning-keys for more information.\n' +
           '    in span (at **)\n' +
-          '    in Outer (at **)' +
+          '    in Outer (at **)',
-          (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in p (at **)'),
       ]);
     });
 
@@ -663,8 +670,7 @@ describe('memo', () => {
           '\n\nCheck the top-level render call using <Inner>. It was passed a child from Inner. ' +
           'See https://react.dev/link/warning-keys for more information.\n' +
           '    in span (at **)\n' +
-          '    in Inner (at **)' +
+          '    in Inner (at **)',
-          (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in p (at **)'),
       ]);
     });
   }

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

@@ -41,7 +41,7 @@ describe('ReactOwnerStacks', () => {
     }
   });
 
-  // @gate __DEV__ && enableOwnerStacks
+  // @gate __DEV__
   it('can get the component owner stacks during rendering in dev', async () => {
     let stack;
 
@@ -75,7 +75,7 @@ describe('ReactOwnerStacks', () => {
 
   it('returns null outside of render', async () => {
     // Awkward to gate since some builds will have `captureOwnerStack` return null in prod
-    if (__DEV__ && gate('enableOwnerStacks')) {
+    if (__DEV__) {
       expect(React.captureOwnerStack()).toBe(null);
 
       await act(() => {

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

@@ -257,9 +257,6 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. Creating ' +
         'promises inside a Client Component or hook is not yet ' +
         'supported, except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Async (at **)\n' + '    in Suspense (at **)\n') +
         '    in App (at **)',
     ]);
     assertLog(['ABC']);
@@ -430,20 +427,10 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. Creating ' +
         'promises inside a Client Component or hook is not yet ' +
         'supported, except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Async (at **)\n' +
-            '    in ErrorBoundary (at **)\n' +
-            '    in Suspense (at **)\n') +
         '    in App (at **)',
       'A component was suspended by an uncached promise. Creating ' +
         'promises inside a Client Component or hook is not yet ' +
         'supported, except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Async (at **)\n' +
-            '    in ErrorBoundary (at **)\n' +
-            '    in Suspense (at **)\n') +
         '    in App (at **)',
     ]);
     assertLog([
@@ -617,8 +604,7 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        '     in App (at **)\n' +
+        '     in App (at **)',
-        '     in Suspense (at **)',
     ]);
     expect(root).toMatchRenderedOutput('Async');
   });
@@ -667,8 +653,7 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        '     in App (at **)\n' +
+        '     in App (at **)',
-        '     in Suspense (at **)',
     ]);
     expect(root).toMatchRenderedOutput('Async');
   });
@@ -1216,8 +1201,7 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        '    in AsyncText (at **)\n' +
+        '    in AsyncText (at **)',
-        '    in Suspense (at **)',
     ]);
     expect(root).toMatchRenderedOutput('A(Loading B...)');
 
@@ -1243,9 +1227,7 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        '    in AsyncText (at **)\n' +
+        '    in AsyncText (at **)',
-        '    in Suspense (at **)\n' +
-        '    in Suspense (at **)',
     ]);
     expect(root).toMatchRenderedOutput('AB(Loading C...)');
 
@@ -1263,10 +1245,7 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        '    in AsyncText (at **)\n' +
+        '    in AsyncText (at **)',
-        '    in Suspense (at **)\n' +
-        '    in Suspense (at **)\n' +
-        '    in Suspense (at **)',
     ]);
     expect(root).toMatchRenderedOutput('ABC');
   });
@@ -1301,16 +1280,10 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Async (at **)\n' + '    in Suspense (at **)\n') +
         '    in App (at **)',
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Async (at **)\n' + '    in Suspense (at **)\n') +
         '    in App (at **)',
     ]);
     expect(root).toMatchRenderedOutput('A1');
@@ -1685,10 +1658,6 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in **/ReactUse-test.js:**:** (at **)\n' +
-            '    in Suspense (at **)\n') +
         '    in App (at **)',
     ]);
     expect(root).toMatchRenderedOutput('Async');
@@ -1723,10 +1692,6 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in **/ReactUse-test.js:**:** (at **)\n' +
-            '    in Suspense (at **)\n') +
         '    in App (at **)',
     ]);
     expect(root).toMatchRenderedOutput('Async');
@@ -1752,10 +1717,6 @@ describe('ReactUse', () => {
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in **/ReactUse-test.js:**:** (at **)\n' +
-            '    in Suspense (at **)\n') +
         '    in App (at **)',
     ]);
     expect(root).toMatchRenderedOutput('Async!');
@@ -1810,36 +1771,17 @@ describe('ReactUse', () => {
     assertConsoleErrorDev([
       'ContextProvider uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks') ? '' : '    in ContextProvider (at **)\n') +
         '    in App (at **)',
       'Async uses the legacy contextTypes API which will be removed soon. ' +
         'Use React.createContext() with React.useContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Async (at **)\n' +
-            '    in div (at **)\n' +
-            '    in Suspense (at **)\n' +
-            '    in ContextProvider (at **)\n') +
         '    in App (at **)',
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Async (at **)\n' +
-            '    in div (at **)\n' +
-            '    in Suspense (at **)\n' +
-            '    in ContextProvider (at **)\n') +
         '    in App (at **)',
       'A component was suspended by an uncached promise. ' +
         'Creating promises inside a Client Component or hook is not yet supported, ' +
         'except via a Suspense-compatible library or framework.\n' +
-        (gate('enableOwnerStacks')
-          ? ''
-          : '    in Async (at **)\n' +
-            '    in div (at **)\n' +
-            '    in Suspense (at **)\n' +
-            '    in ContextProvider (at **)\n') +
         '    in App (at **)',
     ]);
     expect(root).toMatchRenderedOutput(
@@ -1921,8 +1863,7 @@ describe('ReactUse', () => {
         'Only Server Components can be async at the moment. ' +
         "This error is often caused by accidentally adding `'use client'` " +
         'to a module that was originally written for the server.\n' +
-        '    in AsyncClientComponent (at **)' +
+        '    in AsyncClientComponent (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in ErrorBoundary (at **)'),
     ]);
     assertLog([
       'An unknown Component is an async Client Component. ' +
@@ -1977,8 +1918,7 @@ describe('ReactUse', () => {
         'Only Server Components can be async at the moment. ' +
         "This error is often caused by accidentally adding `'use client'` " +
         'to a module that was originally written for the server.\n' +
-        '    in AsyncClientComponent (at **)' +
+        '    in AsyncClientComponent (at **)',
-        (gate('enableOwnerStacks') ? '' : '\n    in ErrorBoundary (at **)'),
     ]);
     assertLog([
       'An unknown Component is an async Client Component. ' +

packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMBrowser-test.js

@@ -1170,25 +1170,15 @@ describe('ReactFlightDOMBrowser', () => {
     );
     const result = await ReactServerDOMClient.createFromReadableStream(stream);
 
-    if (!gate(flags => flags.enableOwnerStacks)) {
-      assertConsoleErrorDev([
-        'Each child in a list should have a unique "key" prop. ' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
-          '    in div (at **)',
-      ]);
-    }
-
     await act(() => {
       root.render(result);
     });
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        'Each child in a list should have a unique "key" prop.\n\n' +
+        'Check the top-level render call using <ParentClient>. ' +
-          'Check the top-level render call using <ParentClient>. ' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
+        '    in div (at **)',
-          '    in div (at **)',
+    ]);
-      ]);
-    }
   });
 
   it('basic use(promise)', async () => {

packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMEdge-test.js

@@ -1020,7 +1020,7 @@ describe('ReactFlightDOMEdge', () => {
     }
   });
 
-  // @gate __DEV__ && enableOwnerStacks
+  // @gate __DEV__
   it('can get the component owner stacks asynchronously', async () => {
     let stack;
 

packages/react-server/src/ReactFizzComponentStack.js

@@ -26,10 +26,7 @@ import {
   REACT_VIEW_TRANSITION_TYPE,
 } from 'shared/ReactSymbols';
 
-import {
+import {enableViewTransition} from 'shared/ReactFeatureFlags';
-  enableOwnerStacks,
-  enableViewTransition,
-} from 'shared/ReactFeatureFlags';
 
 import {formatOwnerStack} from 'shared/ReactOwnerStackFrames';
 
@@ -134,7 +131,7 @@ function describeFunctionComponentFrameWithoutLineNumber(fn: Function): string {
 export function getOwnerStackByComponentStackNodeInDev(
   componentStack: ComponentStackNode,
 ): string {
-  if (!enableOwnerStacks || !__DEV__) {
+  if (!__DEV__) {
     return '';
   }
   try {

packages/react-server/src/ReactFizzServer.js

@@ -165,7 +165,6 @@ import {
   enableRenderableContext,
   disableDefaultPropsExceptForClasses,
   enableAsyncIterableChildren,
-  enableOwnerStacks,
   enableViewTransition,
 } from 'shared/ReactFeatureFlags';
 
@@ -787,7 +786,7 @@ function createRenderTask(
   if (!disableLegacyContext) {
     task.legacyContext = legacyContext;
   }
-  if (__DEV__ && enableOwnerStacks) {
+  if (__DEV__) {
     task.debugTask = debugTask;
   }
   abortSet.add(task);
@@ -840,7 +839,7 @@ function createReplayTask(
   if (!disableLegacyContext) {
     task.legacyContext = legacyContext;
   }
-  if (__DEV__ && enableOwnerStacks) {
+  if (__DEV__) {
     task.debugTask = debugTask;
   }
   abortSet.add(task);
@@ -875,12 +874,9 @@ function getCurrentStackInDEV(): string {
     if (currentTaskInDEV === null || currentTaskInDEV.componentStack === null) {
       return '';
     }
-    if (enableOwnerStacks) {
+    return getOwnerStackByComponentStackNodeInDev(
-      return getOwnerStackByComponentStackNodeInDev(
+      currentTaskInDEV.componentStack,
-        currentTaskInDEV.componentStack,
+    );
-      );
-    }
-    return getStackByComponentStackNode(currentTaskInDEV.componentStack);
   }
   return '';
 }
@@ -907,18 +903,16 @@ function pushServerComponentStack(
       if (typeof componentInfo.name !== 'string') {
         continue;
       }
-      if (enableOwnerStacks && componentInfo.debugStack === undefined) {
+      if (componentInfo.debugStack === undefined) {
         continue;
       }
       task.componentStack = {
         parent: task.componentStack,
         type: componentInfo,
         owner: componentInfo.owner,
-        stack: enableOwnerStacks ? componentInfo.debugStack : null,
+        stack: componentInfo.debugStack,
       };
-      if (enableOwnerStacks) {
+      task.debugTask = (componentInfo.debugTask: any);
-        task.debugTask = (componentInfo.debugTask: any);
-      }
     }
   }
 }
@@ -934,12 +928,10 @@ function pushComponentStack(task: Task): void {
         const element: any = node;
         const type = element.type;
         const owner = __DEV__ ? element._owner : null;
-        const stack = __DEV__ && enableOwnerStacks ? element._debugStack : null;
+        const stack = __DEV__ ? element._debugStack : null;
         if (__DEV__) {
           pushServerComponentStack(task, element._debugInfo);
-          if (enableOwnerStacks) {
+          task.debugTask = element._debugTask;
-            task.debugTask = element._debugTask;
-          }
         }
         task.componentStack = createComponentStackFromType(
           task.componentStack,
@@ -1056,7 +1048,7 @@ function logPostpone(
   // If this callback errors, we intentionally let that error bubble up to become a fatal error
   // so that someone fixes the error reporting instead of hiding it.
   const onPostpone = request.onPostpone;
-  if (__DEV__ && enableOwnerStacks && debugTask) {
+  if (__DEV__ && debugTask) {
     debugTask.run(onPostpone.bind(null, reason, postponeInfo));
   } else {
     onPostpone(reason, postponeInfo);
@@ -1073,7 +1065,7 @@ function logRecoverableError(
   // so that someone fixes the error reporting instead of hiding it.
   const onError = request.onError;
   const errorDigest =
-    __DEV__ && enableOwnerStacks && debugTask
+    __DEV__ && debugTask
       ? debugTask.run(onError.bind(null, error, errorInfo))
       : onError(error, errorInfo);
   if (errorDigest != null && typeof errorDigest !== 'string') {
@@ -1101,7 +1093,7 @@ function fatalError(
   // It's also called if React itself or its host configs errors.
   const onShellError = request.onShellError;
   const onFatalError = request.onFatalError;
-  if (__DEV__ && enableOwnerStacks && debugTask) {
+  if (__DEV__ && debugTask) {
     debugTask.run(onShellError.bind(null, error));
     debugTask.run(onFatalError.bind(null, error));
   } else {
@@ -1261,7 +1253,7 @@ function renderSuspenseBoundary(
       task.componentStack,
       task.isFallback,
       !disableLegacyContext ? task.legacyContext : emptyContextObject,
-      __DEV__ && enableOwnerStacks ? task.debugTask : null,
+      __DEV__ ? task.debugTask : null,
     );
     pushComponentStack(suspendedPrimaryTask);
     request.pingedTasks.push(suspendedPrimaryTask);
@@ -1334,7 +1326,7 @@ function renderSuspenseBoundary(
           request,
           postponeInstance.message,
           thrownInfo,
-          __DEV__ && enableOwnerStacks ? task.debugTask : null,
+          __DEV__ ? task.debugTask : null,
         );
         // TODO: Figure out a better signal than a magic digest value.
         errorDigest = 'POSTPONE';
@@ -1343,7 +1335,7 @@ function renderSuspenseBoundary(
           request,
           error,
           thrownInfo,
-          __DEV__ && enableOwnerStacks ? task.debugTask : null,
+          __DEV__ ? task.debugTask : null,
         );
       }
       encodeErrorForBoundary(
@@ -1387,7 +1379,7 @@ function renderSuspenseBoundary(
       task.componentStack,
       true,
       !disableLegacyContext ? task.legacyContext : emptyContextObject,
-      __DEV__ && enableOwnerStacks ? task.debugTask : null,
+      __DEV__ ? task.debugTask : null,
     );
     pushComponentStack(suspendedFallbackTask);
     // TODO: This should be queued at a separate lower priority queue so that we only work
@@ -1485,7 +1477,7 @@ function replaySuspenseBoundary(
         request,
         postponeInstance.message,
         thrownInfo,
-        __DEV__ && enableOwnerStacks ? task.debugTask : null,
+        __DEV__ ? task.debugTask : null,
       );
       // TODO: Figure out a better signal than a magic digest value.
       errorDigest = 'POSTPONE';
@@ -1494,7 +1486,7 @@ function replaySuspenseBoundary(
         request,
         error,
         thrownInfo,
-        __DEV__ && enableOwnerStacks ? task.debugTask : null,
+        __DEV__ ? task.debugTask : null,
       );
     }
     encodeErrorForBoundary(
@@ -1545,7 +1537,7 @@ function replaySuspenseBoundary(
     task.componentStack,
     true,
     !disableLegacyContext ? task.legacyContext : emptyContextObject,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
+    __DEV__ ? task.debugTask : null,
   );
 
   pushComponentStack(suspendedFallbackTask);
@@ -1587,7 +1579,7 @@ function renderPreamble(
     task.componentStack,
     task.isFallback,
     !disableLegacyContext ? task.legacyContext : emptyContextObject,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
+    __DEV__ ? task.debugTask : null,
   );
   pushComponentStack(preambleTask);
   request.pingedTasks.push(preambleTask);
@@ -2489,7 +2481,7 @@ function replayElement(
           thrownInfo,
           childNodes,
           childSlots,
-          __DEV__ && enableOwnerStacks ? task.debugTask : null,
+          __DEV__ ? task.debugTask : null,
         );
       }
       task.replay = replay;
@@ -2654,15 +2646,14 @@ function renderNodeDestructive(
   task.childIndex = childIndex;
 
   const previousComponentStack = task.componentStack;
-  const previousDebugTask =
+  const previousDebugTask = __DEV__ ? task.debugTask : null;
-    __DEV__ && enableOwnerStacks ? task.debugTask : null;
 
   pushComponentStack(task);
 
   retryNode(request, task);
 
   task.componentStack = previousComponentStack;
-  if (__DEV__ && enableOwnerStacks) {
+  if (__DEV__) {
     task.debugTask = previousDebugTask;
   }
 }
@@ -2689,8 +2680,7 @@ function retryNode(request: Request, task: Task): void {
         const refProp = props.ref;
         const ref = refProp !== undefined ? refProp : null;
 
-        const debugTask: null | ConsoleTask =
+        const debugTask: null | ConsoleTask = __DEV__ ? task.debugTask : null;
-          __DEV__ && enableOwnerStacks ? task.debugTask : null;
 
         const name = getComponentNameFromType(type);
         const keyOrIndex =
@@ -3002,7 +2992,7 @@ function replayFragment(
         thrownInfo,
         childNodes,
         childSlots,
-        __DEV__ && enableOwnerStacks ? task.debugTask : null,
+        __DEV__ ? task.debugTask : null,
       );
     }
     task.replay = replay;
@@ -3094,7 +3084,7 @@ function warnForMissingKey(request: Request, task: Task, child: mixed): void {
       task.componentStack,
       (child: any).type,
       (child: any)._owner,
-      enableOwnerStacks ? (child: any)._debugStack : null,
+      (child: any)._debugStack,
     );
     task.componentStack = stackFrame;
     console.error(
@@ -3117,9 +3107,7 @@ function renderChildrenArray(
   const previousComponentStack = task.componentStack;
   let previousDebugTask = null;
   if (__DEV__) {
-    if (enableOwnerStacks) {
+    previousDebugTask = task.debugTask;
-      previousDebugTask = task.debugTask;
-    }
     // We read debugInfo from task.node instead of children because it might have been an
     // unwrapped iterable so we read from the original node.
     pushServerComponentStack(task, (task.node: any)._debugInfo);
@@ -3137,9 +3125,7 @@ function renderChildrenArray(
       task.keyPath = prevKeyPath;
       if (__DEV__) {
         task.componentStack = previousComponentStack;
-        if (enableOwnerStacks) {
+        task.debugTask = previousDebugTask;
-          task.debugTask = previousDebugTask;
-        }
       }
       return;
     }
@@ -3173,9 +3159,7 @@ function renderChildrenArray(
       task.keyPath = prevKeyPath;
       if (__DEV__) {
         task.componentStack = previousComponentStack;
-        if (enableOwnerStacks) {
+        task.debugTask = previousDebugTask;
-          task.debugTask = previousDebugTask;
-        }
       }
       return;
     }
@@ -3198,9 +3182,7 @@ function renderChildrenArray(
   task.keyPath = prevKeyPath;
   if (__DEV__) {
     task.componentStack = previousComponentStack;
-    if (enableOwnerStacks) {
+    task.debugTask = previousDebugTask;
-      task.debugTask = previousDebugTask;
-    }
   }
 }
 
@@ -3394,12 +3376,7 @@ function injectPostponedHole(
   reason: string,
   thrownInfo: ThrownInfo,
 ): Segment {
-  logPostpone(
+  logPostpone(request, reason, thrownInfo, __DEV__ ? task.debugTask : null);
-    request,
-    reason,
-    thrownInfo,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
-  );
   // Something suspended, we'll need to create a new segment and resolve it later.
   const segment = task.blockedSegment;
   const insertionIndex = segment.chunks.length;
@@ -3440,7 +3417,7 @@ function spawnNewSuspendedReplayTask(
     task.componentStack,
     task.isFallback,
     !disableLegacyContext ? task.legacyContext : emptyContextObject,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
+    __DEV__ ? task.debugTask : null,
   );
 }
 
@@ -3482,7 +3459,7 @@ function spawnNewSuspendedRenderTask(
     task.componentStack,
     task.isFallback,
     !disableLegacyContext ? task.legacyContext : emptyContextObject,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
+    __DEV__ ? task.debugTask : null,
   );
 }
 
@@ -3504,8 +3481,7 @@ function renderNode(
   const previousKeyPath = task.keyPath;
   const previousTreeContext = task.treeContext;
   const previousComponentStack = task.componentStack;
-  const previousDebugTask =
+  const previousDebugTask = __DEV__ ? task.debugTask : null;
-    __DEV__ && enableOwnerStacks ? task.debugTask : null;
   let x;
   // Store how much we've pushed at this point so we can reset it in case something
   // suspended partially through writing something.
@@ -3551,7 +3527,7 @@ function renderNode(
           task.keyPath = previousKeyPath;
           task.treeContext = previousTreeContext;
           task.componentStack = previousComponentStack;
-          if (__DEV__ && enableOwnerStacks) {
+          if (__DEV__) {
             task.debugTask = previousDebugTask;
           }
           // Restore all active ReactContexts to what they were before.
@@ -3584,7 +3560,7 @@ function renderNode(
           task.keyPath = previousKeyPath;
           task.treeContext = previousTreeContext;
           task.componentStack = previousComponentStack;
-          if (__DEV__ && enableOwnerStacks) {
+          if (__DEV__) {
             task.debugTask = previousDebugTask;
           }
           // Restore all active ReactContexts to what they were before.
@@ -3642,7 +3618,7 @@ function renderNode(
           task.keyPath = previousKeyPath;
           task.treeContext = previousTreeContext;
           task.componentStack = previousComponentStack;
-          if (__DEV__ && enableOwnerStacks) {
+          if (__DEV__) {
             task.debugTask = previousDebugTask;
           }
           // Restore all active ReactContexts to what they were before.
@@ -3681,7 +3657,7 @@ function renderNode(
           task.keyPath = previousKeyPath;
           task.treeContext = previousTreeContext;
           task.componentStack = previousComponentStack;
-          if (__DEV__ && enableOwnerStacks) {
+          if (__DEV__) {
             task.debugTask = previousDebugTask;
           }
           // Restore all active ReactContexts to what they were before.
@@ -3714,7 +3690,7 @@ function renderNode(
           task.keyPath = previousKeyPath;
           task.treeContext = previousTreeContext;
           task.componentStack = previousComponentStack;
-          if (__DEV__ && enableOwnerStacks) {
+          if (__DEV__) {
             task.debugTask = previousDebugTask;
           }
           // Restore all active ReactContexts to what they were before.
@@ -4421,14 +4397,14 @@ function retryRenderTask(
           request,
           postponeInstance.message,
           thrownInfo,
-          __DEV__ && enableOwnerStacks ? task.debugTask : null,
+          __DEV__ ? task.debugTask : null,
         );
       } else {
         logRecoverableError(
           request,
           x,
           thrownInfo,
-          __DEV__ && enableOwnerStacks ? task.debugTask : null,
+          __DEV__ ? task.debugTask : null,
         );
       }
 
@@ -4464,7 +4440,7 @@ function retryRenderTask(
           request,
           postponeInstance.message,
           postponeInfo,
-          __DEV__ && enableOwnerStacks ? task.debugTask : null,
+          __DEV__ ? task.debugTask : null,
         );
         trackPostpone(request, trackedPostpones, task, segment);
         finishedTask(request, task.blockedBoundary, segment);
@@ -4481,7 +4457,7 @@ function retryRenderTask(
       task.blockedBoundary,
       x,
       errorInfo,
-      __DEV__ && enableOwnerStacks ? task.debugTask : null,
+      __DEV__ ? task.debugTask : null,
     );
     return;
   } finally {
@@ -4560,7 +4536,7 @@ function retryReplayTask(request: Request, task: ReplayTask): void {
       errorInfo,
       task.replay.nodes,
       task.replay.slots,
-      __DEV__ && enableOwnerStacks ? task.debugTask : null,
+      __DEV__ ? task.debugTask : null,
     );
     request.pendingRootTasks--;
     if (request.pendingRootTasks === 0) {

packages/react-server/src/ReactFlightServer.js

@@ -17,7 +17,6 @@ import {
   enablePostpone,
   enableHalt,
   enableTaint,
-  enableOwnerStacks,
   enableProfilerTimer,
   enableComponentPerformanceTrack,
 } from 'shared/ReactFeatureFlags';
@@ -254,15 +253,11 @@ if (__DEV__ && typeof console === 'object' && console !== null) {
 
 function getCurrentStackInDEV(): string {
   if (__DEV__) {
-    if (enableOwnerStacks) {
+    const owner: null | ReactComponentInfo = resolveOwner();
-      const owner: null | ReactComponentInfo = resolveOwner();
+    if (owner === null) {
-      if (owner === null) {
+      return '';
-        return '';
-      }
-      return getOwnerStackByComponentInfoInDev(owner);
     }
-    // We don't have Parent Stacks in Flight.
+    return getOwnerStackByComponentInfoInDev(owner);
-    return '';
   }
   return '';
 }
@@ -624,8 +619,8 @@ function serializeThenable(
     task.implicitSlot,
     request.abortableTasks,
     __DEV__ ? task.debugOwner : null,
-    __DEV__ && enableOwnerStacks ? task.debugStack : null,
+    __DEV__ ? task.debugStack : null,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
+    __DEV__ ? task.debugTask : null,
   );
   if (__DEV__) {
     // If this came from Flight, forward any debug info into this new row.
@@ -744,8 +739,8 @@ function serializeReadableStream(
     task.implicitSlot,
     request.abortableTasks,
     __DEV__ ? task.debugOwner : null,
-    __DEV__ && enableOwnerStacks ? task.debugStack : null,
+    __DEV__ ? task.debugStack : null,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
+    __DEV__ ? task.debugTask : null,
   );
   request.abortableTasks.delete(streamTask);
 
@@ -834,8 +829,8 @@ function serializeAsyncIterable(
     task.implicitSlot,
     request.abortableTasks,
     __DEV__ ? task.debugOwner : null,
-    __DEV__ && enableOwnerStacks ? task.debugStack : null,
+    __DEV__ ? task.debugStack : null,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
+    __DEV__ ? task.debugTask : null,
   );
   request.abortableTasks.delete(streamTask);
 
@@ -1035,23 +1030,21 @@ function callWithDebugContextInDEV<A, T>(
     key: null,
     owner: task.debugOwner,
   };
-  if (enableOwnerStacks) {
+  // $FlowFixMe[cannot-write]
-    // $FlowFixMe[cannot-write]
+  componentDebugInfo.stack =
-    componentDebugInfo.stack =
+    task.debugStack === null
-      task.debugStack === null
+      ? null
-        ? null
+      : filterStackTrace(request, task.debugStack, 1);
-        : filterStackTrace(request, task.debugStack, 1);
+  // $FlowFixMe[cannot-write]
-    // $FlowFixMe[cannot-write]
+  componentDebugInfo.debugStack = task.debugStack;
-    componentDebugInfo.debugStack = task.debugStack;
+  // $FlowFixMe[cannot-write]
-    // $FlowFixMe[cannot-write]
+  componentDebugInfo.debugTask = task.debugTask;
-    componentDebugInfo.debugTask = task.debugTask;
-  }
   const debugTask = task.debugTask;
   // We don't need the async component storage context here so we only set the
   // synchronous tracking of owner.
   setCurrentOwner(componentDebugInfo);
   try {
-    if (enableOwnerStacks && debugTask) {
+    if (debugTask) {
       return debugTask.run(callback.bind(null, arg));
     }
     return callback(arg);
@@ -1238,22 +1231,18 @@ function renderFunctionComponent<Props>(
         key: key,
         owner: task.debugOwner,
       }: ReactComponentInfo);
-      if (enableOwnerStacks) {
+      // $FlowFixMe[cannot-write]
-        // $FlowFixMe[cannot-write]
+      componentDebugInfo.stack =
-        componentDebugInfo.stack =
+        task.debugStack === null
-          task.debugStack === null
+          ? null
-            ? null
+          : filterStackTrace(request, task.debugStack, 1);
-            : filterStackTrace(request, task.debugStack, 1);
+      // $FlowFixMe[cannot-write]
-        // $FlowFixMe[cannot-write]
+      componentDebugInfo.props = props;
-        componentDebugInfo.props = props;
+      // $FlowFixMe[cannot-write]
-        // $FlowFixMe[cannot-write]
+      componentDebugInfo.debugStack = task.debugStack;
-        componentDebugInfo.debugStack = task.debugStack;
+      // $FlowFixMe[cannot-write]
-        // $FlowFixMe[cannot-write]
+      componentDebugInfo.debugTask = task.debugTask;
-        componentDebugInfo.debugTask = task.debugTask;
+
-      } else {
-        // $FlowFixMe[cannot-write]
-        componentDebugInfo.props = props;
-      }
       // We outline this model eagerly so that we can refer to by reference as an owner.
       // If we had a smarter way to dedupe we might not have to do this if there ends up
       // being no references to this as an owner.
@@ -1271,14 +1260,14 @@ function renderFunctionComponent<Props>(
       // We've emitted the latest environment for this task so we track that.
       task.environmentName = componentEnv;
 
-      if (enableOwnerStacks && validated === 2) {
+      if (validated === 2) {
         warnForMissingKey(request, key, componentDebugInfo, task.debugTask);
       }
     }
     prepareToUseHooksForComponent(prevThenableState, componentDebugInfo);
     if (supportsComponentStorage) {
       // Run the component in an Async Context that tracks the current owner.
-      if (enableOwnerStacks && task.debugTask) {
+      if (task.debugTask) {
         result = task.debugTask.run(
           // $FlowFixMe[method-unbinding]
           componentStorage.run.bind(
@@ -1300,7 +1289,7 @@ function renderFunctionComponent<Props>(
         );
       }
     } else {
-      if (enableOwnerStacks && task.debugTask) {
+      if (task.debugTask) {
         result = task.debugTask.run(
           callComponentInDEV.bind(null, Component, props, componentDebugInfo),
         );
@@ -1387,7 +1376,7 @@ function warnForMissingKey(
 
     if (supportsComponentStorage) {
       // Run the component in an Async Context that tracks the current owner.
-      if (enableOwnerStacks && debugTask) {
+      if (debugTask) {
         debugTask.run(
           // $FlowFixMe[method-unbinding]
           componentStorage.run.bind(
@@ -1409,7 +1398,7 @@ function warnForMissingKey(
         );
       }
     } else {
-      if (enableOwnerStacks && debugTask) {
+      if (debugTask) {
         debugTask.run(
           callComponentInDEV.bind(null, logKeyError, null, componentDebugInfo),
         );
@@ -1445,23 +1434,15 @@ function renderFragment(
     // We have a Server Component that specifies a key but we're now splitting
     // the tree using a fragment.
     const fragment = __DEV__
-      ? enableOwnerStacks
+      ? [
-        ? [
+          REACT_ELEMENT_TYPE,
-            REACT_ELEMENT_TYPE,
+          REACT_FRAGMENT_TYPE,
-            REACT_FRAGMENT_TYPE,
+          task.keyPath,
-            task.keyPath,
+          {children},
-            {children},
+          null,
-            null,
+          null,
-            null,
+          0,
-            0,
+        ]
-          ]
-        : [
-            REACT_ELEMENT_TYPE,
-            REACT_FRAGMENT_TYPE,
-            task.keyPath,
-            {children},
-            null,
-          ]
       : [REACT_ELEMENT_TYPE, REACT_FRAGMENT_TYPE, task.keyPath, {children}];
     if (!task.implicitSlot) {
       // If this was keyed inside a set. I.e. the outer Server Component was keyed
@@ -1517,23 +1498,15 @@ function renderAsyncFragment(
     // We have a Server Component that specifies a key but we're now splitting
     // the tree using a fragment.
     const fragment = __DEV__
-      ? enableOwnerStacks
+      ? [
-        ? [
+          REACT_ELEMENT_TYPE,
-            REACT_ELEMENT_TYPE,
+          REACT_FRAGMENT_TYPE,
-            REACT_FRAGMENT_TYPE,
+          task.keyPath,
-            task.keyPath,
+          {children},
-            {children},
+          null,
-            null,
+          null,
-            null,
+          0,
-            0,
+        ]
-          ]
-        : [
-            REACT_ELEMENT_TYPE,
-            REACT_FRAGMENT_TYPE,
-            task.keyPath,
-            {children},
-            null,
-          ]
       : [REACT_ELEMENT_TYPE, REACT_FRAGMENT_TYPE, task.keyPath, {children}];
     if (!task.implicitSlot) {
       // If this was keyed inside a set. I.e. the outer Server Component was keyed
@@ -1586,19 +1559,17 @@ function renderClientElement(
     }
   }
   const element = __DEV__
-    ? enableOwnerStacks
+    ? [
-      ? [
+        REACT_ELEMENT_TYPE,
-          REACT_ELEMENT_TYPE,
+        type,
-          type,
+        key,
-          key,
+        props,
-          props,
+        task.debugOwner,
-          task.debugOwner,
+        task.debugStack === null
-          task.debugStack === null
+          ? null
-            ? null
+          : filterStackTrace(request, task.debugStack, 1),
-            : filterStackTrace(request, task.debugStack, 1),
+        validated,
-          validated,
+      ]
-        ]
-      : [REACT_ELEMENT_TYPE, type, key, props, task.debugOwner]
     : [REACT_ELEMENT_TYPE, type, key, props];
   if (task.implicitSlot && key !== null) {
     // The root Server Component had no key so it was in an implicit slot.
@@ -1626,8 +1597,8 @@ function outlineTask(request: Request, task: Task): ReactJSONValue {
     task.implicitSlot,
     request.abortableTasks,
     __DEV__ ? task.debugOwner : null,
-    __DEV__ && enableOwnerStacks ? task.debugStack : null,
+    __DEV__ ? task.debugStack : null,
-    __DEV__ && enableOwnerStacks ? task.debugTask : null,
+    __DEV__ ? task.debugTask : null,
   );
 
   retryTask(request, newTask);
@@ -1694,7 +1665,7 @@ function renderElement(
   } else if (type === REACT_FRAGMENT_TYPE && key === null) {
     // For key-less fragments, we add a small optimization to avoid serializing
     // it as a wrapper.
-    if (__DEV__ && enableOwnerStacks && validated === 2) {
+    if (__DEV__ && validated === 2) {
       // Create a fake owner node for the error stack.
       const componentDebugInfo: ReactComponentInfo = {
         name: 'Fragment',
@@ -1900,10 +1871,8 @@ function createTask(
   if (__DEV__) {
     task.environmentName = request.environmentName();
     task.debugOwner = debugOwner;
-    if (enableOwnerStacks) {
+    task.debugStack = debugStack;
-      task.debugStack = debugStack;
+    task.debugTask = debugTask;
-      task.debugTask = debugTask;
-    }
   }
   abortSet.add(task);
   return task;
@@ -2348,8 +2317,8 @@ function renderModel(
           task.implicitSlot,
           request.abortableTasks,
           __DEV__ ? task.debugOwner : null,
-          __DEV__ && enableOwnerStacks ? task.debugStack : null,
+          __DEV__ ? task.debugStack : null,
-          __DEV__ && enableOwnerStacks ? task.debugTask : null,
+          __DEV__ ? task.debugTask : null,
         );
         const ping = newTask.ping;
         (x: any).then(ping, ping);
@@ -2487,10 +2456,8 @@ function renderModelDestructive(
 
         if (__DEV__) {
           task.debugOwner = element._owner;
-          if (enableOwnerStacks) {
+          task.debugStack = element._debugStack;
-            task.debugStack = element._debugStack;
+          task.debugTask = element._debugTask;
-            task.debugTask = element._debugTask;
-          }
           // TODO: Pop this. Since we currently don't have a point where we can pop the stack
           // this debug information will be used for errors inside sibling properties that
           // are not elements. Leading to the wrong attribution on the server. We could fix
@@ -2506,7 +2473,7 @@ function renderModelDestructive(
           element.key,
           ref,
           props,
-          __DEV__ && enableOwnerStacks ? element._store.validated : 0,
+          __DEV__ ? element._store.validated : 0,
         );
         if (
           typeof newChild === 'object' &&
@@ -3291,10 +3258,8 @@ function outlineComponentInfo(
     key: componentInfo.key,
     owner: componentInfo.owner,
   };
-  if (enableOwnerStacks) {
+  // $FlowFixMe[cannot-write]
-    // $FlowFixMe[cannot-write]
+  componentDebugInfo.stack = componentInfo.stack;
-    componentDebugInfo.stack = componentInfo.stack;
-  }
   // Ensure we serialize props after the stack to favor the stack being complete.
   // $FlowFixMe[cannot-write]
   componentDebugInfo.props = componentInfo.props;
@@ -3435,33 +3400,23 @@ function renderConsoleValue(
           doNotLimit.add(element._owner);
         }
 
-        if (enableOwnerStacks) {
+        let debugStack: null | ReactStackTrace = null;
-          let debugStack: null | ReactStackTrace = null;
+        if (element._debugStack != null) {
-          if (element._debugStack != null) {
+          // Outline the debug stack so that it doesn't get cut off.
-            // Outline the debug stack so that it doesn't get cut off.
+          debugStack = filterStackTrace(request, element._debugStack, 1);
-            debugStack = filterStackTrace(request, element._debugStack, 1);
+          doNotLimit.add(debugStack);
-            doNotLimit.add(debugStack);
+          for (let i = 0; i < debugStack.length; i++) {
-            for (let i = 0; i < debugStack.length; i++) {
+            doNotLimit.add(debugStack[i]);
-              doNotLimit.add(debugStack[i]);
-            }
           }
-          return [
-            REACT_ELEMENT_TYPE,
-            element.type,
-            element.key,
-            element.props,
-            element._owner,
-            debugStack,
-            element._store.validated,
-          ];
         }
-
         return [
           REACT_ELEMENT_TYPE,
           element.type,
           element.key,
           element.props,
           element._owner,
+          debugStack,
+          element._store.validated,
         ];
       }
     }

packages/react/index.fb.js

@@ -7,8 +7,8 @@
  * @flow
  */
 
-import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
 import {captureOwnerStack as captureOwnerStackImpl} from './src/ReactClient';
+
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   __COMPILER_RUNTIME,
@@ -72,7 +72,7 @@ export {useMemoCache as c} from './src/ReactHooks';
 
 // Only export captureOwnerStack in development.
 let captureOwnerStack: ?() => null | string;
-if (__DEV__ && enableOwnerStacks) {
+if (__DEV__) {
   captureOwnerStack = captureOwnerStackImpl;
 }
 

packages/react/src/ReactOwnerStack.js

@@ -7,18 +7,17 @@
  * @flow
  */
 
-import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 
 export function captureOwnerStack(): null | string {
-  if (!enableOwnerStacks || !__DEV__) {
+  if (__DEV__) {
-    return null;
+    const getCurrentStack = ReactSharedInternals.getCurrentStack;
+    if (getCurrentStack === null) {
+      return null;
+    }
+    // The current stack will be the owner stack which it is always here.
+    return getCurrentStack();
   }
-  const getCurrentStack = ReactSharedInternals.getCurrentStack;
+
-  if (getCurrentStack === null) {
+  return 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();
 }

packages/react/src/ReactServer.fb.js

@@ -10,7 +10,6 @@
 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 {enableOwnerStacks} from 'shared/ReactFeatureFlags';
 import {captureOwnerStack as captureOwnerStackImpl} from './ReactOwnerStack';
 import {
   REACT_FRAGMENT_TYPE,
@@ -39,9 +38,8 @@ const Children = {
   only,
 };
 
-// Only export captureOwnerStack if the flag is on, to support feature detection.
 let captureOwnerStack: ?() => null | string;
-if (__DEV__ && enableOwnerStacks) {
+if (__DEV__) {
   captureOwnerStack = captureOwnerStackImpl;
 }
 

packages/react/src/__tests__/ReactChildren-test.js

@@ -333,16 +333,6 @@ describe('ReactChildren', () => {
     }
 
     const instance = <div>{threeDivIterable}</div>;
-    assertConsoleErrorDev(
-      // With the flag on this doesn't warn eagerly but only when rendered
-      gate(flag => flag.enableOwnerStacks)
-        ? []
-        : [
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the top-level render call using <div>. See https://react.dev/link/warning-keys for more information.\n' +
-              '    in div (at **)',
-          ],
-    );
 
     React.Children.forEach(instance.props.children, callback, context);
 
@@ -369,8 +359,7 @@ describe('ReactChildren', () => {
       'Each child in a list should have a unique "key" prop.\n\n' +
         'Check the top-level render call using <div>. It was passed a child from div.' +
         ' See https://react.dev/link/warning-keys for more information.\n' +
-        '    in div (at **)' +
+        '    in div (at **)',
-        (gate(flag => flag.enableOwnerStacks) ? '' : '\n    in div (at **)'),
     ]);
   });
 
@@ -894,22 +883,13 @@ describe('ReactChildren', () => {
         </ComponentRenderingMappedChildren>,
       );
     });
-    assertConsoleErrorDev(
+    assertConsoleErrorDev([
-      gate(flags => flags.enableOwnerStacks)
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        ? [
+        'Check the render method of `ComponentRenderingMappedChildren`.' +
-            'Each child in a list should have a unique "key" prop.\n\n' +
+        ' See https://react.dev/link/warning-keys for more information.\n' +
-              'Check the render method of `ComponentRenderingMappedChildren`.' +
+        '    in div (at **)\n' +
-              ' See https://react.dev/link/warning-keys for more information.\n' +
+        '    in **/ReactChildren-test.js:**:** (at **)',
-              '    in div (at **)\n' +
+    ]);
-              '    in **/ReactChildren-test.js:**:** (at **)',
-          ]
-        : [
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the top-level render call using <ComponentRenderingMappedChildren>.' +
-              ' See https://react.dev/link/warning-keys for more information.\n' +
-              '    in div (at **)',
-          ],
-    );
   });
 
   it('does not warn for mapped static children without keys', async () => {
@@ -953,21 +933,12 @@ describe('ReactChildren', () => {
         </ComponentRenderingClonedChildren>,
       );
     });
-    assertConsoleErrorDev(
+    assertConsoleErrorDev([
-      gate(flags => flags.enableOwnerStacks)
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        ? [
+        'Check the render method of `ComponentRenderingClonedChildren`.' +
-            'Each child in a list should have a unique "key" prop.\n\n' +
+        ' See https://react.dev/link/warning-keys for more information.\n' +
-              'Check the render method of `ComponentRenderingClonedChildren`.' +
+        '    in div (at **)',
-              ' See https://react.dev/link/warning-keys for more information.\n' +
+    ]);
-              '    in div (at **)',
-          ]
-        : [
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the top-level render call using <ComponentRenderingClonedChildren>.' +
-              ' See https://react.dev/link/warning-keys for more information.\n' +
-              '    in div (at **)',
-          ],
-    );
   });
 
   it('does not warn for cloned static children without keys', async () => {
@@ -1005,21 +976,12 @@ describe('ReactChildren', () => {
         </ComponentRenderingFlattenedChildren>,
       );
     });
-    assertConsoleErrorDev(
+    assertConsoleErrorDev([
-      gate(flags => flags.enableOwnerStacks)
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        ? [
+        'Check the render method of `ComponentRenderingFlattenedChildren`.' +
-            'Each child in a list should have a unique "key" prop.\n\n' +
+        ' See https://react.dev/link/warning-keys for more information.\n' +
-              'Check the render method of `ComponentRenderingFlattenedChildren`.' +
+        '    in div (at **)',
-              ' See https://react.dev/link/warning-keys for more information.\n' +
+    ]);
-              '    in div (at **)',
-          ]
-        : [
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the top-level render call using <ComponentRenderingFlattenedChildren>.' +
-              ' See https://react.dev/link/warning-keys for more information.\n' +
-              '    in div (at **)',
-          ],
-    );
   });
 
   it('does not warn for flattened static children without keys', async () => {

packages/react/src/__tests__/ReactCoffeeScriptClass-test.coffee

@@ -266,26 +266,14 @@ describe 'ReactCoffeeScriptClass', ->
 
       test React.createElement(Outer), 'SPAN', 'foo'
       
-      if featureFlags.enableOwnerStacks
+      assertConsoleErrorDev([
-        assertConsoleErrorDev([
+        'Outer uses the legacy childContextTypes API which will soon be removed.
-          'Outer uses the legacy childContextTypes API which will soon be removed.
+         Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-           Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
+          '    in Outer (at **)',
-            '    in Outer (at **)',
+        'Foo uses the legacy contextTypes API which will soon be removed.
-          'Foo uses the legacy contextTypes API which will soon be removed.
+         Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-           Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
+          '    in Outer (at **)',
-            '    in Outer (at **)',
+      ]);
-        ]);
-      else
-        assertConsoleErrorDev([
-          'Outer uses the legacy childContextTypes API which will soon be removed.
-           Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-            '    in Outer (at **)',
-          'Foo uses the legacy contextTypes API which will soon be removed.
-           Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-            '    in Foo (at **)\n' +
-            '    in Outer (at **)',
-        ]);
-      
 
   it 'renders only once when setting state in componentWillMount', ->
     renderCount = 0
@@ -578,24 +566,13 @@ describe 'ReactCoffeeScriptClass', ->
           React.createElement Bar
 
       test React.createElement(Foo), 'DIV', 'bar-through-context'
-      if featureFlags.enableOwnerStacks
+      assertConsoleErrorDev [
-        assertConsoleErrorDev [
+        'Foo uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.
-          'Foo uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.
+         (https://react.dev/link/legacy-context)\n' +
-           (https://react.dev/link/legacy-context)\n' +
+          '    in Foo (at **)',
-            '    in Foo (at **)',
+        'Bar uses the legacy contextTypes API which will soon be removed. Use React.createContext() with static contextType instead.
-          'Bar uses the legacy contextTypes API which will soon be removed. Use React.createContext() with static contextType instead.
+         (https://react.dev/link/legacy-context)\n' +
-           (https://react.dev/link/legacy-context)\n' +
+          '    in Foo (at **)'
-            '    in Foo (at **)'
+      ]
-        ]
-      else
-        assertConsoleErrorDev [
-          'Foo uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.
-           (https://react.dev/link/legacy-context)\n' +
-            '    in Foo (at **)',
-          'Bar uses the legacy contextTypes API which will soon be removed. Use React.createContext() with static contextType instead.
-           (https://react.dev/link/legacy-context)\n' +
-            '    in Bar (at **)\n' +
-            '    in Foo (at **)'
-        ]
 
   undefined

packages/react/src/__tests__/ReactContextValidator-test.js

@@ -78,9 +78,7 @@ describe('ReactContextValidator', () => {
         '    in ComponentInFooBarContext (at **)',
       'Component uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in ComponentInFooBarContext (at **)',
-          ? '    in ComponentInFooBarContext (at **)'
-          : '    in Component (at **)'),
     ]);
     expect(instance.childRef.current.context).toEqual({foo: 'abc'});
   });
@@ -159,9 +157,7 @@ describe('ReactContextValidator', () => {
         '    in Parent (at **)',
       'Component uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in Parent (at **)',
-          ? '    in Parent (at **)'
-          : '    in Component (at **)'),
     ]);
 
     expect(constructorContext).toEqual({foo: 'abc'});
@@ -282,21 +278,12 @@ describe('ReactContextValidator', () => {
         '    in ParentContextProvider (at **)',
       'MiddleMissingContext uses the legacy childContextTypes API which will soon be removed. ' +
         'Use React.createContext() instead. (https://react.dev/link/legacy-context)\n' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '    in MiddleMissingContext (at **)\n') +
         '    in ParentContextProvider (at **)',
       'MiddleMissingContext.childContextTypes is specified but there is no getChildContext() method on the instance. ' +
         'You can either define getChildContext() on MiddleMissingContext or remove childContextTypes from it.\n' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '    in MiddleMissingContext (at **)\n') +
         '    in ParentContextProvider (at **)',
       'ChildContextConsumer uses the legacy contextTypes API which will soon be removed. ' +
         'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '    in ChildContextConsumer (at **)\n') +
         '    in MiddleMissingContext (at **)\n' +
         '    in ParentContextProvider (at **)',
     ]);

packages/react/src/__tests__/ReactCreateElement-test.js

@@ -77,13 +77,7 @@ describe('ReactCreateElement', () => {
         'in `undefined` being returned. If you need to access the same ' +
         'value within the child component, you should pass it as a different ' +
         'prop. (https://react.dev/link/special-props)\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in Parent (at **)',
-          ? ['    in Parent (at **)']
-          : [
-              '    in Child (at **)\n' +
-                '    in div (at **)\n' +
-                '    in Parent (at **)',
-            ]),
     ]);
   });
 

packages/react/src/__tests__/ReactCreateRef-test.js

@@ -46,10 +46,7 @@ describe('ReactCreateRef', () => {
     assertConsoleErrorDev([
       'Unexpected ref object provided for div. ' +
         'Use either a ref-setter function or React.createRef().\n' +
-        '    in div (at **)' +
+        '    in div (at **)',
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '\n    in Wrapper (at **)'),
     ]);
 
     ReactDOM.flushSync(() => {
@@ -62,10 +59,7 @@ describe('ReactCreateRef', () => {
     assertConsoleErrorDev([
       'Unexpected ref object provided for ExampleComponent. ' +
         'Use either a ref-setter function or React.createRef().\n' +
-        '    in ExampleComponent (at **)' +
+        '    in ExampleComponent (at **)',
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '\n    in Wrapper (at **)'),
     ]);
   });
 });

packages/react/src/__tests__/ReactES6Class-test.js

@@ -305,9 +305,6 @@ describe('ReactES6Class', () => {
           '    in Outer (at **)',
         'Foo uses the legacy contextTypes API which will soon be removed. ' +
           'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '    in Foo (at **)\n') +
           '    in Outer (at **)',
       ]);
     });
@@ -638,9 +635,6 @@ describe('ReactES6Class', () => {
           '    in Foo (at **)',
         'Bar uses the legacy contextTypes API which will soon be removed. ' +
           'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-          (gate(flags => flags.enableOwnerStacks)
-            ? ''
-            : '    in Bar (at **)\n') +
           '    in Foo (at **)',
       ]);
     });

packages/react/src/__tests__/ReactElementValidator-test.internal.js

@@ -46,19 +46,11 @@ describe('ReactElementValidator', () => {
         ]),
       ),
     );
-    assertConsoleErrorDev(
+    assertConsoleErrorDev([
-      gate(flags => flags.enableOwnerStacks)
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        ? [
+        'Check the render method of `ComponentClass`. See https://react.dev/link/warning-keys for more information.\n' +
-            'Each child in a list should have a unique "key" prop.\n\n' +
+        '    in ComponentClass (at **)',
-              'Check the render method of `ComponentClass`. See https://react.dev/link/warning-keys for more information.\n' +
+    ]);
-              '    in ComponentClass (at **)',
-          ]
-        : [
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the top-level render call using <ComponentClass>. See https://react.dev/link/warning-keys for more information.\n' +
-              '    in ComponentClass (at **)',
-          ],
-    );
   });
 
   it('warns for keys for arrays of elements with owner info', async () => {
@@ -83,18 +75,10 @@ describe('ReactElementValidator', () => {
     await act(() => root.render(React.createElement(ComponentWrapper)));
     assertConsoleErrorDev([
       'Each child in a list should have a unique "key" prop.' +
-        '\n\nCheck the render method of `' +
+        '\n\nCheck the render method of `ComponentClass`. ' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? 'ComponentClass'
-          : 'InnerClass') +
-        '`. ' +
         'It was passed a child from ComponentWrapper. ' +
         'See https://react.dev/link/warning-keys for more information.\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in ComponentWrapper (at **)',
-          ? '    in ComponentWrapper (at **)'
-          : '    in ComponentClass (at **)\n' +
-            '    in InnerClass (at **)\n' +
-            '    in ComponentWrapper (at **)'),
     ]);
   });
 
@@ -109,16 +93,12 @@ describe('ReactElementValidator', () => {
     const root = ReactDOMClient.createRoot(document.createElement('div'));
     await act(() => root.render(<Anonymous>{divs}</Anonymous>));
     assertConsoleErrorDev([
-      gate(flags => flags.enableOwnerStacks)
+      // For owner stacks the parent being validated is the div.
-        ? // For owner stacks the parent being validated is the div.
+      'Each child in a list should have a unique ' +
-          'Each child in a list should have a unique ' +
+        '"key" prop.' +
-          '"key" prop.' +
+        '\n\nCheck the top-level render call using <div>. ' +
-          '\n\nCheck the top-level render call using <div>. ' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-          'See https://react.dev/link/warning-keys for more information.\n' +
+        '    in div (at **)',
-          '    in div (at **)'
-        : 'Each child in a list should have a unique ' +
-          '"key" prop. See https://react.dev/link/warning-keys for more information.\n' +
-          '    in div (at **)',
     ]);
   });
 
@@ -158,9 +138,6 @@ describe('ReactElementValidator', () => {
         'https://react.dev/link/warning-keys for more information.\n' +
         '    in div (at **)\n' +
         '    in Component (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '    in Parent (at **)\n') +
         '    in GrandParent (at **)',
     ]);
   });
@@ -206,35 +183,12 @@ describe('ReactElementValidator', () => {
     await act(() =>
       root.render(React.createElement(ComponentClass, null, iterable)),
     );
-    assertConsoleErrorDev(
+    assertConsoleErrorDev([
-      gate(flag => flag.enableOwnerStacks)
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        ? [
+        'Check the render method of `ComponentClass`. It was passed a child from div. ' +
-            'Each child in a list should have a unique "key" prop.\n\n' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-              'Check the render method of `ComponentClass`. It was passed a child from div. ' +
+        '    in ComponentClass (at **)',
-              'See https://react.dev/link/warning-keys for more information.\n' +
+    ]);
-              '    in ComponentClass (at **)',
-          ]
-        : // Since each pass generates a new element, it doesn't get marked as
-          // validated and it gets rechecked each time.
-          [
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the top-level render call using <ComponentClass>. ' +
-              'See https://react.dev/link/warning-keys for more information.\n' +
-              '    in ComponentClass (at **)',
-
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the render method of `ComponentClass`. ' +
-              'See https://react.dev/link/warning-keys for more information.\n' +
-              '    in ComponentClass (at **)\n' +
-              '    in ComponentClass (at **)',
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the render method of `ComponentClass`. It was passed a child from div. ' +
-              'See https://react.dev/link/warning-keys for more information.\n' +
-              '    in ComponentClass (at **)\n' +
-              '    in div (at **)\n' +
-              '    in ComponentClass (at **)',
-          ],
-    );
   });
 
   it('does not warns for arrays of elements with keys', () => {
@@ -373,13 +327,6 @@ describe('ReactElementValidator', () => {
     ];
     for (let i = 0; i < cases.length; i++) {
       await act(async () => root.render(cases[i][0]()));
-      assertConsoleErrorDev(
-        gate(flag => flag.enableOwnerStacks)
-          ? // We don't need these extra warnings because we already have the errors.
-            []
-          : [cases[i][1]],
-        {withoutStack: true},
-      );
     }
 
     expect(errors).toEqual(
@@ -468,21 +415,6 @@ describe('ReactElementValidator', () => {
         'or a class/function (for composite components) but got: null.' +
         (__DEV__ ? '\n\nCheck the render method of `ParentComp`.' : ''),
     );
-    assertConsoleErrorDev(
-      gate(flag => flag.enableOwnerStacks)
-        ? // We don't need these extra warnings because we already have the errors.
-          []
-        : [
-            'React.createElement: type is invalid -- expected a string ' +
-              '(for built-in components) or a class/function (for composite ' +
-              'components) but got: null.\n' +
-              '    in ParentComp (at **)',
-            'React.createElement: type is invalid -- expected a string ' +
-              '(for built-in components) or a class/function (for composite ' +
-              'components) but got: null.\n' +
-              '    in ParentComp (at **)',
-          ],
-    );
   });
 
   it('warns for fragments with illegal attributes', async () => {
@@ -559,18 +491,6 @@ describe('ReactElementValidator', () => {
   it('does not blow up on key warning with undefined type', () => {
     const Foo = undefined;
     void (<Foo>{[<div />]}</Foo>);
-    assertConsoleErrorDev(
-      gate(flags => flags.enableOwnerStacks)
-        ? []
-        : [
-            'React.jsx: type is invalid -- expected a string ' +
-              '(for built-in components) or a class/function (for composite ' +
-              'components) but got: undefined. You likely forgot to export your ' +
-              "component from the file it's defined in, or you might have mixed up " +
-              'default and named imports.',
-          ],
-      {withoutStack: true},
-    );
   });
 
   it('does not call lazy initializers eagerly', () => {

packages/react/src/__tests__/ReactJSXElementValidator-test.js

@@ -49,13 +49,9 @@ describe('ReactJSXElementValidator', () => {
       root.render(<Component>{[<Component />, <Component />]}</Component>);
     });
     assertConsoleErrorDev([
-      gate(flags => flags.enableOwnerStacks)
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        ? 'Each child in a list should have a unique "key" prop.\n\n' +
+        'Check the render method of `Component`. See https://react.dev/link/warning-keys for more information.\n' +
-          'Check the render method of `Component`. See https://react.dev/link/warning-keys for more information.\n' +
+        '    in Component (at **)',
-          '    in Component (at **)'
-        : 'Each child in a list should have a unique "key" prop.\n\n' +
-          'Check the top-level render call using <Component>. See https://react.dev/link/warning-keys for more information.\n' +
-          '    in Component (at **)',
     ]);
   });
 
@@ -79,17 +75,9 @@ describe('ReactJSXElementValidator', () => {
     });
     assertConsoleErrorDev([
       'Each child in a list should have a unique "key" prop.' +
-        '\n\nCheck the render method of `' +
+        '\n\nCheck the render method of `Component`. ' +
-        (gate(flag => flag.enableOwnerStacks)
-          ? 'Component'
-          : 'InnerComponent') +
-        '`. ' +
         'It was passed a child from ComponentWrapper. See https://react.dev/link/warning-keys for more information.\n' +
-        (gate(flag => flag.enableOwnerStacks)
+        '    in ComponentWrapper (at **)',
-          ? '    in ComponentWrapper (at **)'
-          : '    in Component (at **)\n' +
-            '    in InnerComponent (at **)\n' +
-            '    in ComponentWrapper (at **)'),
     ]);
   });
 
@@ -112,34 +100,12 @@ describe('ReactJSXElementValidator', () => {
     await act(() => {
       root.render(<Component>{iterable}</Component>);
     });
-    assertConsoleErrorDev(
+    assertConsoleErrorDev([
-      gate(flag => flag.enableOwnerStacks)
+      'Each child in a list should have a unique "key" prop.\n\n' +
-        ? [
+        'Check the render method of `Component`. It was passed a child from div. ' +
-            'Each child in a list should have a unique "key" prop.\n\n' +
+        'See https://react.dev/link/warning-keys for more information.\n' +
-              'Check the render method of `Component`. It was passed a child from div. ' +
+        '    in Component (at **)',
-              'See https://react.dev/link/warning-keys for more information.\n' +
+    ]);
-              '    in Component (at **)',
-          ]
-        : // Since each pass generates a new element, it doesn't get marked as
-          // validated and it gets rechecked each time.
-          [
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the top-level render call using <Component>. ' +
-              'See https://react.dev/link/warning-keys for more information.\n' +
-              '    in Component (at **)',
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the render method of `Component`. ' +
-              'See https://react.dev/link/warning-keys for more information.\n' +
-              '    in Component (at **)\n' +
-              '    in Component (at **)',
-            'Each child in a list should have a unique "key" prop.\n\n' +
-              'Check the render method of `Component`. It was passed a child from div. ' +
-              'See https://react.dev/link/warning-keys for more information.\n' +
-              '    in Component (at **)\n' +
-              '    in div (at **)\n' +
-              '    in Component (at **)',
-          ],
-    );
   });
 
   it('does not warn for arrays of elements with keys', async () => {

packages/react/src/__tests__/ReactJSXRuntime-test.js

@@ -215,11 +215,7 @@ describe('ReactJSXRuntime', () => {
         'in `undefined` being returned. If you need to access the same ' +
         'value within the child component, you should pass it as a different ' +
         'prop. (https://react.dev/link/special-props)\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in Parent (at **)',
-          ? '    in Parent (at **)'
-          : '    in Child (at **)\n' +
-            '    in div (at **)\n' +
-            '    in Parent (at **)'),
     ]);
   });
 
@@ -279,9 +275,6 @@ describe('ReactJSXRuntime', () => {
     assertConsoleErrorDev([
       'Each child in a list should have a unique "key" prop.\n\n' +
         'Check the render method of `Parent`. See https://react.dev/link/warning-keys for more information.\n' +
-        (gate(flags => flags.enableOwnerStacks)
-          ? ''
-          : '    in Child (at **)\n') +
         '    in Parent (at **)',
     ]);
   });

packages/react/src/__tests__/ReactStrictMode-test.js

@@ -1042,67 +1042,30 @@ describe('context legacy', () => {
       root.render(<Root />);
     });
 
-    if (gate(flags => flags.enableOwnerStacks)) {
+    assertConsoleErrorDev([
-      assertConsoleErrorDev([
+      'LegacyContextProvider uses the legacy childContextTypes API ' +
-        'LegacyContextProvider uses the legacy childContextTypes API ' +
+        'which will soon be removed. Use React.createContext() instead. ' +
-          'which will soon be removed. Use React.createContext() instead. ' +
+        '(https://react.dev/link/legacy-context)' +
-          '(https://react.dev/link/legacy-context)' +
+        '\n    in Root (at **)',
-          '\n    in Root (at **)',
+      'LegacyContextConsumer uses the legacy contextTypes API which ' +
-        'LegacyContextConsumer uses the legacy contextTypes API which ' +
+        'will soon be removed. Use React.createContext() with static ' +
-          'will soon be removed. Use React.createContext() with static ' +
+        'contextType instead. (https://react.dev/link/legacy-context)' +
-          'contextType instead. (https://react.dev/link/legacy-context)' +
+        '\n    in LegacyContextProvider (at **)' +
-          '\n    in LegacyContextProvider (at **)' +
+        '\n    in Root (at **)',
-          '\n    in Root (at **)',
+      'FunctionalLegacyContextConsumer uses the legacy contextTypes ' +
-        'FunctionalLegacyContextConsumer uses the legacy contextTypes ' +
+        'API which will be removed soon. Use React.createContext() ' +
-          'API which will be removed soon. Use React.createContext() ' +
+        'with React.useContext() instead. (https://react.dev/link/legacy-context)' +
-          'with React.useContext() instead. (https://react.dev/link/legacy-context)' +
+        '\n    in LegacyContextProvider (at **)' +
-          '\n    in LegacyContextProvider (at **)' +
+        '\n    in Root (at **)',
-          '\n    in Root (at **)',
+      'Legacy context API has been detected within a strict-mode tree.' +
-        'Legacy context API has been detected within a strict-mode tree.' +
+        '\n\nThe old API will be supported in all 16.x releases, but applications ' +
-          '\n\nThe old API will be supported in all 16.x releases, but applications ' +
+        'using it should migrate to the new version.' +
-          'using it should migrate to the new version.' +
+        '\n\nPlease update the following components: ' +
-          '\n\nPlease update the following components: ' +
+        'FunctionalLegacyContextConsumer, LegacyContextConsumer, LegacyContextProvider' +
-          'FunctionalLegacyContextConsumer, LegacyContextConsumer, LegacyContextProvider' +
+        '\n\nLearn more about this warning here: ' +
-          '\n\nLearn more about this warning here: ' +
+        'https://react.dev/link/legacy-context' +
-          'https://react.dev/link/legacy-context' +
+        '\n    in Root (at **)',
-          '\n    in Root (at **)',
+    ]);
-      ]);
-    } else {
-      assertConsoleErrorDev([
-        'LegacyContextProvider uses the legacy childContextTypes API ' +
-          'which will soon be removed. Use React.createContext() instead. ' +
-          '(https://react.dev/link/legacy-context)' +
-          '\n    in LegacyContextProvider (at **)' +
-          '\n    in div (at **)' +
-          '\n    in Root (at **)',
-        'LegacyContextConsumer uses the legacy contextTypes API which ' +
-          'will soon be removed. Use React.createContext() with static ' +
-          'contextType instead. (https://react.dev/link/legacy-context)' +
-          '\n    in LegacyContextConsumer (at **)' +
-          '\n    in div (at **)' +
-          '\n    in LegacyContextProvider (at **)' +
-          '\n    in div (at **)' +
-          '\n    in Root (at **)',
-        'FunctionalLegacyContextConsumer uses the legacy contextTypes ' +
-          'API which will be removed soon. Use React.createContext() ' +
-          'with React.useContext() instead. (https://react.dev/link/legacy-context)' +
-          '\n    in FunctionalLegacyContextConsumer (at **)' +
-          '\n    in div (at **)' +
-          '\n    in LegacyContextProvider (at **)' +
-          '\n    in div (at **)' +
-          '\n    in Root (at **)',
-        'Legacy context API has been detected within a strict-mode tree.' +
-          '\n\nThe old API will be supported in all 16.x releases, but applications ' +
-          'using it should migrate to the new version.' +
-          '\n\nPlease update the following components: ' +
-          'FunctionalLegacyContextConsumer, LegacyContextConsumer, LegacyContextProvider' +
-          '\n\nLearn more about this warning here: ' +
-          'https://react.dev/link/legacy-context' +
-          '\n    in LegacyContextProvider (at **)' +
-          '\n    in div (at **)' +
-          '\n    in Root (at **)',
-      ]);
-    }
 
     // Dedupe
     await act(() => {

packages/react/src/__tests__/ReactTypeScriptClass-test.ts

@@ -528,10 +528,7 @@ describe('ReactTypeScriptClass', function () {
           '    in ProvideChildContextTypes (at **)',
         'StateBasedOnContext uses the legacy contextTypes API which will soon be removed. ' +
           'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-          (ReactFeatureFlags.enableOwnerStacks
+          '    in ProvideChildContextTypes.createElement (at **)',
-            ? '    in ProvideChildContextTypes.createElement (at **)'
-            : '    in StateBasedOnContext (at **)\n') +
-          '    in ProvideChildContextTypes (at **)',
       ]);
     });
   }
@@ -724,10 +721,7 @@ describe('ReactTypeScriptClass', function () {
           '    in ProvideContext (at **)',
         'ReadContext uses the legacy contextTypes API which will soon be removed. ' +
           'Use React.createContext() with static contextType instead. (https://react.dev/link/legacy-context)\n' +
-          (ReactFeatureFlags.enableOwnerStacks
+          '    in ProvideContext.createElement (at **)',
-            ? '    in ProvideContext.createElement (at **)'
-            : '    in ReadContext (at **)\n') +
-          '    in ProvideContext (at **)',
       ]);
     });
   }

packages/react/src/__tests__/createReactClassIntegration-test.js

@@ -348,14 +348,10 @@ describe('create-react-class-integration', () => {
       root.render(<Outer />);
     });
     assertConsoleErrorDev([
-      gate(flags =>
+      [
-        flags.enableOwnerStacks
+        'Component uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.',
-          ? [
+        {withoutStack: true},
-              'Component uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.',
+      ],
-              {withoutStack: true},
-            ]
-          : 'Component uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.',
-      ),
       'Component uses the legacy contextTypes API which will soon be removed. Use React.createContext() with static contextType instead.',
     ]);
     expect(container.firstChild.className).toBe('foo');

packages/react/src/__tests__/forwardRef-test.js

@@ -213,9 +213,7 @@ describe('forwardRef', () => {
         '\n\nCheck the top-level render call using <ForwardRef>. It was passed a child from ForwardRef. ' +
         'See https://react.dev/link/warning-keys for more information.\n' +
         '    in span (at **)\n' +
-        (gate(flags => flags.enableOwnerStacks)
+        '    in **/forwardRef-test.js:**:** (at **)',
-          ? '    in **/forwardRef-test.js:**:** (at **)'
-          : '    in p (at **)'),
     ]);
   });
 
@@ -235,8 +233,7 @@ describe('forwardRef', () => {
         '\n\nCheck the top-level render call using <ForwardRef(Inner)>. It was passed a child from ForwardRef(Inner). ' +
         'See https://react.dev/link/warning-keys for more information.\n' +
         '    in span (at **)\n' +
-        '    in Inner (at **)' +
+        '    in Inner (at **)',
-        (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in p (at **)'),
     ]);
   });
 
@@ -257,8 +254,7 @@ describe('forwardRef', () => {
         '\n\nCheck the top-level render call using <ForwardRef(Inner)>. It was passed a child from ForwardRef(Inner). ' +
         'See https://react.dev/link/warning-keys for more information.\n' +
         '    in span (at **)\n' +
-        '    in Inner (at **)' +
+        '    in Inner (at **)',
-        (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in p (at **)'),
     ]);
   });
 
@@ -278,8 +274,7 @@ describe('forwardRef', () => {
         '\n\nCheck the top-level render call using <Outer>. It was passed a child from Outer. ' +
         'See https://react.dev/link/warning-keys for more information.\n' +
         '    in span (at **)\n' +
-        '    in Outer (at **)' +
+        '    in Outer (at **)',
-        (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in p (at **)'),
     ]);
   });
 
@@ -301,8 +296,7 @@ describe('forwardRef', () => {
         '\n\nCheck the top-level render call using <Outer>. It was passed a child from Outer. ' +
         'See https://react.dev/link/warning-keys for more information.\n' +
         '    in span (at **)\n' +
-        '    in Inner (at **)' +
+        '    in Inner (at **)',
-        (gate(flags => flags.enableOwnerStacks) ? '' : '\n    in p (at **)'),
     ]);
   });
 

packages/react/src/jsx/ReactJSXElement.js

@@ -10,25 +10,17 @@ import ReactSharedInternals from 'shared/ReactSharedInternals';
 import hasOwnProperty from 'shared/hasOwnProperty';
 import assign from 'shared/assign';
 import {
-  getIteratorFn,
   REACT_ELEMENT_TYPE,
   REACT_FRAGMENT_TYPE,
   REACT_LAZY_TYPE,
 } from 'shared/ReactSymbols';
 import {checkKeyStringCoercion} from 'shared/CheckStringCoercion';
-import isValidElementType from 'shared/isValidElementType';
 import isArray from 'shared/isArray';
-import {describeUnknownElementTypeFrameInDEV} from 'shared/ReactComponentStackFrame';
+import {disableDefaultPropsExceptForClasses} from 'shared/ReactFeatureFlags';
-import {
-  disableDefaultPropsExceptForClasses,
-  enableOwnerStacks,
-} from 'shared/ReactFeatureFlags';
-
-const REACT_CLIENT_REFERENCE = Symbol.for('react.client.reference');
 
 const createTask =
   // eslint-disable-next-line react-internal/no-production-logging
-  __DEV__ && enableOwnerStacks && console.createTask
+  __DEV__ && console.createTask
     ? // eslint-disable-next-line react-internal/no-production-logging
       console.createTask
     : () => null;
@@ -261,20 +253,18 @@ function ReactElement(
       writable: true,
       value: null,
     });
-    if (enableOwnerStacks) {
+    Object.defineProperty(element, '_debugStack', {
-      Object.defineProperty(element, '_debugStack', {
+      configurable: false,
-        configurable: false,
+      enumerable: false,
-        enumerable: false,
+      writable: true,
-        writable: true,
+      value: debugStack,
-        value: debugStack,
+    });
-      });
+    Object.defineProperty(element, '_debugTask', {
-      Object.defineProperty(element, '_debugTask', {
+      configurable: false,
-        configurable: false,
+      enumerable: false,
-        enumerable: false,
+      writable: true,
-        writable: true,
+      value: debugTask,
-        value: debugTask,
+    });
-      });
-    }
     if (Object.freeze) {
       Object.freeze(element.props);
       Object.freeze(element);
@@ -390,8 +380,8 @@ export function jsxProdSignatureRunningInDevWithDynamicChildren(
       isStaticChildren,
       source,
       self,
-      __DEV__ && enableOwnerStacks ? Error('react-stack-top-frame') : undefined,
+      __DEV__ && Error('react-stack-top-frame'),
-      __DEV__ && enableOwnerStacks ? createTask(getTaskName(type)) : undefined,
+      __DEV__ && createTask(getTaskName(type)),
     );
   }
 }
@@ -412,8 +402,8 @@ export function jsxProdSignatureRunningInDevWithStaticChildren(
       isStaticChildren,
       source,
       self,
-      __DEV__ && enableOwnerStacks ? Error('react-stack-top-frame') : undefined,
+      __DEV__ && Error('react-stack-top-frame'),
-      __DEV__ && enableOwnerStacks ? createTask(getTaskName(type)) : undefined,
+      __DEV__ && createTask(getTaskName(type)),
     );
   }
 }
@@ -434,8 +424,8 @@ export function jsxDEV(type, config, maybeKey, isStaticChildren, source, self) {
     isStaticChildren,
     source,
     self,
-    __DEV__ && enableOwnerStacks ? Error('react-stack-top-frame') : undefined,
+    __DEV__ && Error('react-stack-top-frame'),
-    __DEV__ && enableOwnerStacks ? createTask(getTaskName(type)) : undefined,
+    __DEV__ && createTask(getTaskName(type)),
   );
 }
 
@@ -450,80 +440,37 @@ function jsxDEVImpl(
   debugTask,
 ) {
   if (__DEV__) {
-    if (!enableOwnerStacks && !isValidElementType(type)) {
+    // We don't warn for invalid element type here because with owner stacks,
-      // This is an invalid element type.
+    // we error in the renderer. The renderer is the only one that knows what
-      //
+    // types are valid for this particular renderer so we let it error there.
-      // We warn here so that we can get better stack traces but with enableOwnerStacks
-      // enabled we don't need this because we get good stacks if we error in the
-      // renderer anyway. The renderer is the only one that knows what types are valid
-      // for this particular renderer so we let it error there instead.
-      //
-      // We warn in this case but don't throw. We expect the element creation to
-      // succeed and there will likely be errors in render.
-      let info = '';
-      if (
-        type === undefined ||
-        (typeof type === 'object' &&
-          type !== null &&
-          Object.keys(type).length === 0)
-      ) {
-        info +=
-          ' You likely forgot to export your component from the file ' +
-          "it's defined in, or you might have mixed up default and named imports.";
-      }
 
-      let typeString;
+    // Skip key warning if the type isn't valid since our key validation logic
-      if (type === null) {
+    // doesn't expect a non-string/function type and can throw confusing
-        typeString = 'null';
+    // errors. We don't want exception behavior to differ between dev and
-      } else if (isArray(type)) {
+    // prod. (Rendering will throw with a helpful message and as soon as the
-        typeString = 'array';
+    // type is fixed, the key warnings will appear.)
-      } else if (type !== undefined && type.$$typeof === REACT_ELEMENT_TYPE) {
+    // With owner stacks, we no longer need the type here so this comment is
-        typeString = `<${getComponentNameFromType(type.type) || 'Unknown'} />`;
+    // no longer true. Which is why we can run this even for invalid types.
-        info =
+    const children = config.children;
-          ' Did you accidentally export a JSX literal instead of a component?';
+    if (children !== undefined) {
-      } else {
+      if (isStaticChildren) {
-        typeString = typeof type;
+        if (isArray(children)) {
-      }
+          for (let i = 0; i < children.length; i++) {
+            validateChildKeys(children[i], type);
+          }
 
-      console.error(
+          if (Object.freeze) {
-        'React.jsx: type is invalid -- expected a string (for ' +
+            Object.freeze(children);
-          'built-in components) or a class/function (for composite ' +
-          'components) but got: %s.%s',
-        typeString,
-        info,
-      );
-    } else {
-      // This is a valid element type.
-
-      // Skip key warning if the type isn't valid since our key validation logic
-      // doesn't expect a non-string/function type and can throw confusing
-      // errors. We don't want exception behavior to differ between dev and
-      // prod. (Rendering will throw with a helpful message and as soon as the
-      // type is fixed, the key warnings will appear.)
-      // When enableOwnerStacks is on, we no longer need the type here so this
-      // comment is no longer true. Which is why we can run this even for invalid
-      // types.
-      const children = config.children;
-      if (children !== undefined) {
-        if (isStaticChildren) {
-          if (isArray(children)) {
-            for (let i = 0; i < children.length; i++) {
-              validateChildKeys(children[i], type);
-            }
-
-            if (Object.freeze) {
-              Object.freeze(children);
-            }
-          } else {
-            console.error(
-              'React.jsx: Static children should always be an array. ' +
-                'You are likely explicitly calling React.jsxs or React.jsxDEV. ' +
-                'Use the Babel transform instead.',
-            );
           }
         } else {
-          validateChildKeys(children, type);
+          console.error(
+            'React.jsx: Static children should always be an array. ' +
+              'You are likely explicitly calling React.jsxs or React.jsxDEV. ' +
+              'Use the Babel transform instead.',
+          );
         }
+      } else {
+        validateChildKeys(children, type);
       }
     }
 
@@ -640,59 +587,17 @@ function jsxDEVImpl(
  */
 export function createElement(type, config, children) {
   if (__DEV__) {
-    if (!enableOwnerStacks && !isValidElementType(type)) {
+    // We don't warn for invalid element type here because with owner stacks,
-      // This is just an optimistic check that provides a better stack trace before
+    // we error in the renderer. The renderer is the only one that knows what
-      // owner stacks. It's really up to the renderer if it's a valid element type.
+    // types are valid for this particular renderer so we let it error there.
-      // When owner stacks are enabled, we instead warn in the renderer and it'll
-      // have the stack trace of the JSX element anyway.
-      //
-      // This is an invalid element type.
-      //
-      // We warn in this case but don't throw. We expect the element creation to
-      // succeed and there will likely be errors in render.
-      let info = '';
-      if (
-        type === undefined ||
-        (typeof type === 'object' &&
-          type !== null &&
-          Object.keys(type).length === 0)
-      ) {
-        info +=
-          ' You likely forgot to export your component from the file ' +
-          "it's defined in, or you might have mixed up default and named imports.";
-      }
 
-      let typeString;
+    // Skip key warning if the type isn't valid since our key validation logic
-      if (type === null) {
+    // doesn't expect a non-string/function type and can throw confusing
-        typeString = 'null';
+    // errors. We don't want exception behavior to differ between dev and
-      } else if (isArray(type)) {
+    // prod. (Rendering will throw with a helpful message and as soon as the
-        typeString = 'array';
+    // type is fixed, the key warnings will appear.)
-      } else if (type !== undefined && type.$$typeof === REACT_ELEMENT_TYPE) {
+    for (let i = 2; i < arguments.length; i++) {
-        typeString = `<${getComponentNameFromType(type.type) || 'Unknown'} />`;
+      validateChildKeys(arguments[i], type);
-        info =
-          ' Did you accidentally export a JSX literal instead of a component?';
-      } else {
-        typeString = typeof type;
-      }
-
-      console.error(
-        'React.createElement: type is invalid -- expected a string (for ' +
-          'built-in components) or a class/function (for composite ' +
-          'components) but got: %s.%s',
-        typeString,
-        info,
-      );
-    } else {
-      // This is a valid element type.
-
-      // Skip key warning if the type isn't valid since our key validation logic
-      // doesn't expect a non-string/function type and can throw confusing
-      // errors. We don't want exception behavior to differ between dev and
-      // prod. (Rendering will throw with a helpful message and as soon as the
-      // type is fixed, the key warnings will appear.)
-      for (let i = 2; i < arguments.length; i++) {
-        validateChildKeys(arguments[i], type);
-      }
     }
 
     // Unlike the jsx() runtime, createElement() doesn't warn about key spread.
@@ -795,8 +700,8 @@ export function createElement(type, config, children) {
     undefined,
     getOwner(),
     props,
-    __DEV__ && enableOwnerStacks ? Error('react-stack-top-frame') : undefined,
+    __DEV__ && Error('react-stack-top-frame'),
-    __DEV__ && enableOwnerStacks ? createTask(getTaskName(type)) : undefined,
+    __DEV__ && createTask(getTaskName(type)),
   );
 }
 
@@ -808,8 +713,8 @@ export function cloneAndReplaceKey(oldElement, newKey) {
     undefined,
     !__DEV__ ? undefined : oldElement._owner,
     oldElement.props,
-    __DEV__ && enableOwnerStacks ? oldElement._debugStack : undefined,
+    __DEV__ && oldElement._debugStack,
-    __DEV__ && enableOwnerStacks ? oldElement._debugTask : undefined,
+    __DEV__ && oldElement._debugTask,
   );
   if (__DEV__) {
     // The cloned element should inherit the original element's key validation.
@@ -914,8 +819,8 @@ export function cloneElement(element, config, children) {
     undefined,
     owner,
     props,
-    __DEV__ && enableOwnerStacks ? element._debugStack : undefined,
+    __DEV__ && element._debugStack,
-    __DEV__ && enableOwnerStacks ? element._debugTask : undefined,
+    __DEV__ && element._debugTask,
   );
 
   for (let i = 2; i < arguments.length; i++) {
@@ -936,51 +841,13 @@ export function cloneElement(element, config, children) {
  */
 function validateChildKeys(node, parentType) {
   if (__DEV__) {
-    if (enableOwnerStacks) {
+    // With owner stacks is, no warnings happens. All we do is
-      // When owner stacks is enabled no warnings happens. All we do is
+    // mark elements as being in a valid static child position so they
-      // mark elements as being in a valid static child position so they
+    // don't need keys.
-      // don't need keys.
+    if (isValidElement(node)) {
-      if (isValidElement(node)) {
-        if (node._store) {
-          node._store.validated = 1;
-        }
-      }
-      return;
-    }
-    if (typeof node !== 'object' || !node) {
-      return;
-    }
-    if (node.$$typeof === REACT_CLIENT_REFERENCE) {
-      // This is a reference to a client component so it's unknown.
-    } else if (isArray(node)) {
-      for (let i = 0; i < node.length; i++) {
-        const child = node[i];
-        if (isValidElement(child)) {
-          validateExplicitKey(child, parentType);
-        }
-      }
-    } else if (isValidElement(node)) {
-      // This element was passed in a valid location.
       if (node._store) {
         node._store.validated = 1;
       }
-    } else {
-      const iteratorFn = getIteratorFn(node);
-      if (typeof iteratorFn === 'function') {
-        // Entry iterators used to provide implicit keys,
-        // but now we print a separate warning for them later.
-        if (iteratorFn !== node.entries) {
-          const iterator = iteratorFn.call(node);
-          if (iterator !== node) {
-            let step;
-            while (!(step = iterator.next()).done) {
-              if (isValidElement(step.value)) {
-                validateExplicitKey(step.value, parentType);
-              }
-            }
-          }
-        }
-      }
     }
   }
 }
@@ -999,92 +866,3 @@ export function isValidElement(object) {
     object.$$typeof === REACT_ELEMENT_TYPE
   );
 }
-
-const ownerHasKeyUseWarning = {};
-
-/**
- * Warn if the element doesn't have an explicit key assigned to it.
- * This element is in an array. The array could grow and shrink or be
- * reordered. All children that haven't already been validated are required to
- * have a "key" property assigned to it. Error statuses are cached so a warning
- * will only be shown once.
- *
- * @internal
- * @param {ReactElement} element Element that requires a key.
- * @param {*} parentType element's parent's type.
- */
-function validateExplicitKey(element, parentType) {
-  if (enableOwnerStacks) {
-    // Skip. Will verify in renderer instead.
-    return;
-  }
-  if (__DEV__) {
-    if (!element._store || element._store.validated || element.key != null) {
-      return;
-    }
-    element._store.validated = 1;
-
-    const currentComponentErrorInfo = getCurrentComponentErrorInfo(parentType);
-    if (ownerHasKeyUseWarning[currentComponentErrorInfo]) {
-      return;
-    }
-    ownerHasKeyUseWarning[currentComponentErrorInfo] = true;
-
-    // Usually the current owner is the offender, but if it accepts children as a
-    // property, it may be the creator of the child that's responsible for
-    // assigning it a key.
-    let childOwner = '';
-    if (element && element._owner != null && element._owner !== getOwner()) {
-      let ownerName = null;
-      if (typeof element._owner.tag === 'number') {
-        ownerName = getComponentNameFromType(element._owner.type);
-      } else if (typeof element._owner.name === 'string') {
-        ownerName = element._owner.name;
-      }
-      // Give the component that originally created this child.
-      childOwner = ` It was passed a child from ${ownerName}.`;
-    }
-
-    const prevGetCurrentStack = ReactSharedInternals.getCurrentStack;
-    ReactSharedInternals.getCurrentStack = function () {
-      const owner = element._owner;
-      // Add an extra top frame while an element is being validated
-      let stack = describeUnknownElementTypeFrameInDEV(
-        element.type,
-        owner ? owner.type : null,
-      );
-      // Delegate to the injected renderer-specific implementation
-      if (prevGetCurrentStack) {
-        stack += prevGetCurrentStack() || '';
-      }
-      return stack;
-    };
-    console.error(
-      'Each child in a list should have a unique "key" prop.' +
-        '%s%s See https://react.dev/link/warning-keys for more information.',
-      currentComponentErrorInfo,
-      childOwner,
-    );
-    ReactSharedInternals.getCurrentStack = prevGetCurrentStack;
-  }
-}
-
-function getCurrentComponentErrorInfo(parentType) {
-  if (__DEV__) {
-    let info = '';
-    const owner = getOwner();
-    if (owner) {
-      const name = getComponentNameFromType(owner.type);
-      if (name) {
-        info = '\n\nCheck the render method of `' + name + '`.';
-      }
-    }
-    if (!info) {
-      const parentName = getComponentNameFromType(parentType);
-      if (parentName) {
-        info = `\n\nCheck the top-level render call using <${parentName}>.`;
-      }
-    }
-    return info;
-  }
-}

packages/shared/ReactComponentInfoStack.js

@@ -11,14 +11,12 @@ import type {ReactComponentInfo} from 'shared/ReactTypes';
 
 import {describeBuiltInComponentFrame} from 'shared/ReactComponentStackFrame';
 
-import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
-
 import {formatOwnerStack} from 'shared/ReactOwnerStackFrames';
 
 export function getOwnerStackByComponentInfoInDev(
   componentInfo: ReactComponentInfo,
 ): string {
-  if (!enableOwnerStacks || !__DEV__) {
+  if (!__DEV__) {
     return '';
   }
   try {

packages/shared/ReactComponentStackFrame.js

@@ -7,25 +7,12 @@
  * @flow
  */
 
-import type {LazyComponent} from 'react/src/ReactLazy';
-
-import {
-  REACT_SUSPENSE_TYPE,
-  REACT_SUSPENSE_LIST_TYPE,
-  REACT_FORWARD_REF_TYPE,
-  REACT_MEMO_TYPE,
-  REACT_LAZY_TYPE,
-  REACT_VIEW_TRANSITION_TYPE,
-} from 'shared/ReactSymbols';
-
 import {disableLogs, reenableLogs} from 'shared/ConsolePatchingDev';
 
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 
 import DefaultPrepareStackTrace from 'shared/DefaultPrepareStackTrace';
 
-import {enableViewTransition} from 'shared/ReactFeatureFlags';
-
 let prefix;
 let suffix;
 export function describeBuiltInComponentFrame(name: string): string {
@@ -300,53 +287,3 @@ export function describeClassComponentFrame(ctor: Function): string {
 export function describeFunctionComponentFrame(fn: Function): string {
   return describeNativeComponentFrame(fn, false);
 }
-
-function shouldConstruct(Component: Function) {
-  const prototype = Component.prototype;
-  return !!(prototype && prototype.isReactComponent);
-}
-
-// TODO: Delete this once the key warning no longer uses it. I.e. when enableOwnerStacks ship.
-export function describeUnknownElementTypeFrameInDEV(type: any): string {
-  if (!__DEV__) {
-    return '';
-  }
-  if (type == null) {
-    return '';
-  }
-  if (typeof type === 'function') {
-    return describeNativeComponentFrame(type, shouldConstruct(type));
-  }
-  if (typeof type === 'string') {
-    return describeBuiltInComponentFrame(type);
-  }
-  switch (type) {
-    case REACT_SUSPENSE_TYPE:
-      return describeBuiltInComponentFrame('Suspense');
-    case REACT_SUSPENSE_LIST_TYPE:
-      return describeBuiltInComponentFrame('SuspenseList');
-    case REACT_VIEW_TRANSITION_TYPE:
-      if (enableViewTransition) {
-        return describeBuiltInComponentFrame('ViewTransition');
-      }
-  }
-  if (typeof type === 'object') {
-    switch (type.$$typeof) {
-      case REACT_FORWARD_REF_TYPE:
-        return describeFunctionComponentFrame(type.render);
-      case REACT_MEMO_TYPE:
-        // Memo may contain any component type so we recursively resolve it.
-        return describeUnknownElementTypeFrameInDEV(type.type);
-      case REACT_LAZY_TYPE: {
-        const lazyComponent: LazyComponent<any, any> = (type: any);
-        const payload = lazyComponent._payload;
-        const init = lazyComponent._init;
-        try {
-          // Lazy may contain any component type so we recursively resolve it.
-          return describeUnknownElementTypeFrameInDEV(init(payload));
-        } catch (x) {}
-      }
-    }
-  }
-  return '';
-}

packages/shared/ReactFeatureFlags.js

@@ -136,8 +136,6 @@ export const passChildrenWhenCloningPersistedNodes = false;
  */
 export const enablePersistedModeClonedFlag = false;
 
-export const enableOwnerStacks = true;
-
 export const enableShallowPropDiffing = false;
 
 export const enableSiblingPrerendering = true;

packages/shared/forks/ReactFeatureFlags.native-fb.js

@@ -32,9 +32,6 @@ export const {
   enableLazyPublicInstanceInFabric,
 } = dynamicFlags;
 
-// These two can be removed
-export const enableOwnerStacks = true;
-
 // The rest of the flags are static for better dead code elimination.
 export const disableClientCache = true;
 export const disableCommentsAsDOMContainers = true;

packages/shared/forks/ReactFeatureFlags.native-oss.js

@@ -41,7 +41,6 @@ export const enableLegacyFBSupport = false;
 export const enableLegacyHidden = false;
 export const enableNoCloningMemoCache = false;
 export const enableObjectFiber = false;
-export const enableOwnerStacks = true;
 export const enablePersistedModeClonedFlag = false;
 export const enablePostpone = false;
 export const enableReactTestRendererWarning = false;

packages/shared/forks/ReactFeatureFlags.test-renderer.js

@@ -91,7 +91,6 @@ export const enableReactTestRendererWarning = true;
 export const disableDefaultPropsExceptForClasses = true;
 
 export const enableObjectFiber = false;
-export const enableOwnerStacks = true;
 
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);

packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js

@@ -35,7 +35,6 @@ export const enableLegacyFBSupport = false;
 export const enableLegacyHidden = false;
 export const enableNoCloningMemoCache = false;
 export const enableObjectFiber = false;
-export const enableOwnerStacks = true;
 export const enablePersistedModeClonedFlag = false;
 export const enablePostpone = false;
 export const enableProfilerCommitHooks = __PROFILE__;

packages/shared/forks/ReactFeatureFlags.test-renderer.www.js

@@ -71,7 +71,6 @@ export const disableDefaultPropsExceptForClasses = true;
 export const renameElementSymbol = false;
 
 export const enableObjectFiber = false;
-export const enableOwnerStacks = true;
 export const enableShallowPropDiffing = false;
 export const enableSiblingPrerendering = true;
 

packages/shared/forks/ReactFeatureFlags.www.js

@@ -43,9 +43,6 @@ export const {
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.
 // It's not used anywhere in production yet.
 
-// Can remove these two
-export const enableOwnerStacks = true;
-
 export const enableProfilerTimer = __PROFILE__;
 export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;

packages/shared/isValidElementType.js

@@ -36,7 +36,7 @@ import {
 const REACT_CLIENT_REFERENCE: symbol = Symbol.for('react.client.reference');
 
 // This function is deprecated. Don't use. Only the renderer knows what a valid type is.
-// TODO: Delete this when enableOwnerStacks ships.
+// TODO: Delete this now that owner stacks shipped.
 export default function isValidElementType(type: mixed): boolean {
   if (typeof type === 'string' || typeof type === 'function') {
     return true;

scripts/jest/setupTests.www.js

@@ -11,7 +11,6 @@ jest.mock('shared/ReactFeatureFlags', () => {
   // Flags that aren't currently used, but we still want to force variants to keep the
   // code live.
   actual.disableInputAttributeSyncing = __VARIANT__;
-  actual.enableOwnerStacks = __VARIANT__;
 
   // These are hardcoded to true for the next release,
   // but still run the tests against both variants until

scripts/jest/setupTests.xplat.js

@@ -11,8 +11,6 @@ jest.mock('shared/ReactFeatureFlags', () => {
     'shared/forks/ReactFeatureFlags.native-fb.js'
   );
 
-  actual.enableOwnerStacks = __VARIANT__;
-
   // Lots of tests use these, but we don't want to expose it to RN.
   // Ideally, tests for xplat wouldn't use react-dom, but many of our tests do.
   // Since the xplat tests run with the www entry points, some of these flags