From b320eca16029f0ce6ae0379298958fad0c383ad0 Mon Sep 17 00:00:00 2001
From: Rick Hanlon <rickhanlonii@fb.com>
Date: Sat, 14 Dec 2024 12:58:11 -0500
Subject: [PATCH 1/2] [flags] Delete enableDebugTracing

---
 .../ReactDOMServerIntegrationModes-test.js    |  50 --
 packages/react-reconciler/src/DebugTracing.js | 231 ---------
 packages/react-reconciler/src/ReactFiber.js   |   9 -
 .../src/ReactFiberClassComponent.js           |  29 --
 .../react-reconciler/src/ReactFiberHooks.js   |  11 -
 .../react-reconciler/src/ReactFiberThrow.js   |  11 -
 .../src/ReactFiberWorkLoop.js                 |  75 ---
 .../__tests__/DebugTracing-test.internal.js   | 440 ------------------
 packages/react-server/src/ReactFizzServer.js  |   2 -
 packages/react/src/ReactClient.js             |   2 -
 .../ReactServer.experimental.development.js   |   2 -
 .../react/src/ReactServer.experimental.js     |   2 -
 packages/shared/ReactFeatureFlags.js          |   5 -
 packages/shared/ReactSymbols.js               |   3 -
 .../forks/ReactFeatureFlags.native-fb.js      |   1 -
 .../forks/ReactFeatureFlags.native-oss.js     |   1 -
 .../forks/ReactFeatureFlags.test-renderer.js  |   1 -
 ...actFeatureFlags.test-renderer.native-fb.js |   1 -
 .../ReactFeatureFlags.test-renderer.www.js    |   1 -
 .../forks/ReactFeatureFlags.www-dynamic.js    |   6 -
 .../shared/forks/ReactFeatureFlags.www.js     |   1 -
 packages/shared/isValidElementType.js         |   3 -
 22 files changed, 887 deletions(-)
 delete mode 100644 packages/react-reconciler/src/DebugTracing.js
 delete mode 100644 packages/react-reconciler/src/__tests__/DebugTracing-test.internal.js

diff --git a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationModes-test.js b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationModes-test.js
index 9dbac22704d17..5770bd1e20c9f 100644
--- a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationModes-test.js
+++ b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationModes-test.js
@@ -37,56 +37,6 @@ describe('ReactDOMServerIntegration', () => {
     resetModules();
   });
 
-  // Test pragmas don't support itRenders abstraction
-  if (
-    __EXPERIMENTAL__ &&
-    require('shared/ReactFeatureFlags').enableDebugTracing
-  ) {
-    describe('React.unstable_DebugTracingMode', () => {
-      beforeEach(() => {
-        spyOnDevAndProd(console, 'log');
-      });
-
-      itRenders('with one child', async render => {
-        const e = await render(
-          <React.unstable_DebugTracingMode>
-            <div>text1</div>
-          </React.unstable_DebugTracingMode>,
-        );
-        const parent = e.parentNode;
-        expect(parent.childNodes[0].tagName).toBe('DIV');
-      });
-
-      itRenders('mode with several children', async render => {
-        const Header = props => {
-          return <p>header</p>;
-        };
-        const Footer = props => {
-          return (
-            <React.unstable_DebugTracingMode>
-              <h2>footer</h2>
-              <h3>about</h3>
-            </React.unstable_DebugTracingMode>
-          );
-        };
-        const e = await render(
-          <React.unstable_DebugTracingMode>
-            <div>text1</div>
-            <span>text2</span>
-            <Header />
-            <Footer />
-          </React.unstable_DebugTracingMode>,
-        );
-        const parent = e.parentNode;
-        expect(parent.childNodes[0].tagName).toBe('DIV');
-        expect(parent.childNodes[1].tagName).toBe('SPAN');
-        expect(parent.childNodes[2].tagName).toBe('P');
-        expect(parent.childNodes[3].tagName).toBe('H2');
-        expect(parent.childNodes[4].tagName).toBe('H3');
-      });
-    });
-  }
-
   describe('React.StrictMode', () => {
     itRenders('a strict mode with one child', async render => {
       const e = await render(
diff --git a/packages/react-reconciler/src/DebugTracing.js b/packages/react-reconciler/src/DebugTracing.js
deleted file mode 100644
index 16606748be696..0000000000000
--- a/packages/react-reconciler/src/DebugTracing.js
+++ /dev/null
@@ -1,231 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow
- */
-
-import type {Lane, Lanes} from './ReactFiberLane';
-import type {Wakeable} from 'shared/ReactTypes';
-
-import {enableDebugTracing} from 'shared/ReactFeatureFlags';
-
-const nativeConsole: Object = console;
-let nativeConsoleLog: null | Function = null;
-
-const pendingGroupArgs: Array<any> = [];
-let printedGroupIndex: number = -1;
-
-function formatLanes(laneOrLanes: Lane | Lanes): string {
-  return '0b' + (laneOrLanes: any).toString(2).padStart(31, '0');
-}
-
-function group(...groupArgs: Array<string>): void {
-  pendingGroupArgs.push(groupArgs);
-
-  if (nativeConsoleLog === null) {
-    nativeConsoleLog = nativeConsole.log;
-    nativeConsole.log = log;
-  }
-}
-
-function groupEnd(): void {
-  pendingGroupArgs.pop();
-  while (printedGroupIndex >= pendingGroupArgs.length) {
-    nativeConsole.groupEnd();
-    printedGroupIndex--;
-  }
-
-  if (pendingGroupArgs.length === 0) {
-    nativeConsole.log = nativeConsoleLog;
-    nativeConsoleLog = null;
-  }
-}
-
-function log(...logArgs: Array<mixed>): void {
-  if (printedGroupIndex < pendingGroupArgs.length - 1) {
-    for (let i = printedGroupIndex + 1; i < pendingGroupArgs.length; i++) {
-      const groupArgs = pendingGroupArgs[i];
-      nativeConsole.group(...groupArgs);
-    }
-    printedGroupIndex = pendingGroupArgs.length - 1;
-  }
-  if (typeof nativeConsoleLog === 'function') {
-    nativeConsoleLog(...logArgs);
-  } else {
-    nativeConsole.log(...logArgs);
-  }
-}
-
-const REACT_LOGO_STYLE =
-  'background-color: #20232a; color: #61dafb; padding: 0 2px;';
-
-export function logCommitStarted(lanes: Lanes): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      group(
-        `%c⚛%c commit%c (${formatLanes(lanes)})`,
-        REACT_LOGO_STYLE,
-        '',
-        'font-weight: normal;',
-      );
-    }
-  }
-}
-
-export function logCommitStopped(): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      groupEnd();
-    }
-  }
-}
-
-const PossiblyWeakMap = typeof WeakMap === 'function' ? WeakMap : Map;
-// $FlowFixMe[incompatible-type]: Flow cannot handle polymorphic WeakMaps
-const wakeableIDs: WeakMap<Wakeable, number> = new PossiblyWeakMap();
-let wakeableID: number = 0;
-function getWakeableID(wakeable: Wakeable): number {
-  if (!wakeableIDs.has(wakeable)) {
-    wakeableIDs.set(wakeable, wakeableID++);
-  }
-  return ((wakeableIDs.get(wakeable): any): number);
-}
-
-export function logComponentSuspended(
-  componentName: string,
-  wakeable: Wakeable,
-): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      const id = getWakeableID(wakeable);
-      const display = (wakeable: any).displayName || wakeable;
-      log(
-        `%c⚛%c ${componentName} suspended`,
-        REACT_LOGO_STYLE,
-        'color: #80366d; font-weight: bold;',
-        id,
-        display,
-      );
-      wakeable.then(
-        () => {
-          log(
-            `%c⚛%c ${componentName} resolved`,
-            REACT_LOGO_STYLE,
-            'color: #80366d; font-weight: bold;',
-            id,
-            display,
-          );
-        },
-        () => {
-          log(
-            `%c⚛%c ${componentName} rejected`,
-            REACT_LOGO_STYLE,
-            'color: #80366d; font-weight: bold;',
-            id,
-            display,
-          );
-        },
-      );
-    }
-  }
-}
-
-export function logLayoutEffectsStarted(lanes: Lanes): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      group(
-        `%c⚛%c layout effects%c (${formatLanes(lanes)})`,
-        REACT_LOGO_STYLE,
-        '',
-        'font-weight: normal;',
-      );
-    }
-  }
-}
-
-export function logLayoutEffectsStopped(): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      groupEnd();
-    }
-  }
-}
-
-export function logPassiveEffectsStarted(lanes: Lanes): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      group(
-        `%c⚛%c passive effects%c (${formatLanes(lanes)})`,
-        REACT_LOGO_STYLE,
-        '',
-        'font-weight: normal;',
-      );
-    }
-  }
-}
-
-export function logPassiveEffectsStopped(): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      groupEnd();
-    }
-  }
-}
-
-export function logRenderStarted(lanes: Lanes): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      group(
-        `%c⚛%c render%c (${formatLanes(lanes)})`,
-        REACT_LOGO_STYLE,
-        '',
-        'font-weight: normal;',
-      );
-    }
-  }
-}
-
-export function logRenderStopped(): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      groupEnd();
-    }
-  }
-}
-
-export function logForceUpdateScheduled(
-  componentName: string,
-  lane: Lane,
-): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      log(
-        `%c⚛%c ${componentName} forced update %c(${formatLanes(lane)})`,
-        REACT_LOGO_STYLE,
-        'color: #db2e1f; font-weight: bold;',
-        '',
-      );
-    }
-  }
-}
-
-export function logStateUpdateScheduled(
-  componentName: string,
-  lane: Lane,
-  payloadOrAction: any,
-): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      log(
-        `%c⚛%c ${componentName} updated state %c(${formatLanes(lane)})`,
-        REACT_LOGO_STYLE,
-        'color: #01a252; font-weight: bold;',
-        '',
-        payloadOrAction,
-      );
-    }
-  }
-}
diff --git a/packages/react-reconciler/src/ReactFiber.js b/packages/react-reconciler/src/ReactFiber.js
index 29a8931038c8d..23078d1d08925 100644
--- a/packages/react-reconciler/src/ReactFiber.js
+++ b/packages/react-reconciler/src/ReactFiber.js
@@ -32,7 +32,6 @@ import {
   enableScopeAPI,
   enableLegacyHidden,
   enableTransitionTracing,
-  enableDebugTracing,
   enableDO_NOT_USE_disableStrictPassiveEffect,
   enableRenderableContext,
   disableLegacyMode,
@@ -89,7 +88,6 @@ import {
 import {
   REACT_FORWARD_REF_TYPE,
   REACT_FRAGMENT_TYPE,
-  REACT_DEBUG_TRACING_MODE_TYPE,
   REACT_STRICT_MODE_TYPE,
   REACT_PROFILER_TYPE,
   REACT_PROVIDER_TYPE,
@@ -630,13 +628,6 @@ export function createFiberFromTypeAndProps(
           return createFiberFromTracingMarker(pendingProps, mode, lanes, key);
         }
       // Fall through
-      case REACT_DEBUG_TRACING_MODE_TYPE:
-        if (enableDebugTracing) {
-          fiberTag = Mode;
-          mode |= DebugTracingMode;
-          break;
-        }
-      // Fall through
       default: {
         if (typeof type === 'object' && type !== null) {
           switch (type.$$typeof) {
diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.js b/packages/react-reconciler/src/ReactFiberClassComponent.js
index c32525702e944..cb06536c5da8a 100644
--- a/packages/react-reconciler/src/ReactFiberClassComponent.js
+++ b/packages/react-reconciler/src/ReactFiberClassComponent.js
@@ -20,7 +20,6 @@ import {
 import {
   debugRenderPhaseSideEffectsForStrictMode,
   disableLegacyContext,
-  enableDebugTracing,
   enableSchedulingProfiler,
   enableLazyContextPropagation,
   disableDefaultPropsExceptForClasses,
@@ -65,7 +64,6 @@ import {
 } from './ReactFiberContext';
 import {readContext, checkIfContextChanged} from './ReactFiberNewContext';
 import {requestUpdateLane, scheduleUpdateOnFiber} from './ReactFiberWorkLoop';
-import {logForceUpdateScheduled, logStateUpdateScheduled} from './DebugTracing';
 import {
   markForceUpdateScheduled,
   markStateUpdateScheduled,
@@ -199,15 +197,6 @@ const classComponentUpdater = {
       entangleTransitions(root, fiber, lane);
     }
 
-    if (__DEV__) {
-      if (enableDebugTracing) {
-        if (fiber.mode & DebugTracingMode) {
-          const name = getComponentNameFromFiber(fiber) || 'Unknown';
-          logStateUpdateScheduled(name, lane, payload);
-        }
-      }
-    }
-
     if (enableSchedulingProfiler) {
       markStateUpdateScheduled(fiber, lane);
     }
@@ -234,15 +223,6 @@ const classComponentUpdater = {
       entangleTransitions(root, fiber, lane);
     }
 
-    if (__DEV__) {
-      if (enableDebugTracing) {
-        if (fiber.mode & DebugTracingMode) {
-          const name = getComponentNameFromFiber(fiber) || 'Unknown';
-          logStateUpdateScheduled(name, lane, payload);
-        }
-      }
-    }
-
     if (enableSchedulingProfiler) {
       markStateUpdateScheduled(fiber, lane);
     }
@@ -269,15 +249,6 @@ const classComponentUpdater = {
       entangleTransitions(root, fiber, lane);
     }
 
-    if (__DEV__) {
-      if (enableDebugTracing) {
-        if (fiber.mode & DebugTracingMode) {
-          const name = getComponentNameFromFiber(fiber) || 'Unknown';
-          logForceUpdateScheduled(name, lane);
-        }
-      }
-    }
-
     if (enableSchedulingProfiler) {
       markForceUpdateScheduled(fiber, lane);
     }
diff --git a/packages/react-reconciler/src/ReactFiberHooks.js b/packages/react-reconciler/src/ReactFiberHooks.js
index d2df61063f687..e063715a88f64 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.js
@@ -35,7 +35,6 @@ import {
 } from './ReactFiberConfig';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 import {
-  enableDebugTracing,
   enableSchedulingProfiler,
   enableCache,
   enableLazyContextPropagation,
@@ -125,7 +124,6 @@ import {
   getIsHydrating,
   tryToClaimNextHydratableFormMarkerInstance,
 } from './ReactFiberHydrationContext';
-import {logStateUpdateScheduled} from './DebugTracing';
 import {
   markStateUpdateScheduled,
   setIsStrictModeForDevtools,
@@ -3928,15 +3926,6 @@ function entangleTransitionUpdate<S, A>(
 }
 
 function markUpdateInDevTools<A>(fiber: Fiber, lane: Lane, action: A): void {
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      if (fiber.mode & DebugTracingMode) {
-        const name = getComponentNameFromFiber(fiber) || 'Unknown';
-        logStateUpdateScheduled(name, lane, action);
-      }
-    }
-  }
-
   if (enableSchedulingProfiler) {
     markStateUpdateScheduled(fiber, lane);
   }
diff --git a/packages/react-reconciler/src/ReactFiberThrow.js b/packages/react-reconciler/src/ReactFiberThrow.js
index e901486c1d448..1db53ff5c31cd 100644
--- a/packages/react-reconciler/src/ReactFiberThrow.js
+++ b/packages/react-reconciler/src/ReactFiberThrow.js
@@ -39,7 +39,6 @@ import {
 } from './ReactFiberFlags';
 import {NoMode, ConcurrentMode, DebugTracingMode} from './ReactTypeOfMode';
 import {
-  enableDebugTracing,
   enableLazyContextPropagation,
   enableUpdaterTracking,
   enablePostpone,
@@ -70,7 +69,6 @@ import {
 } from './ReactFiberWorkLoop';
 import {propagateParentContextChangesToDeferredTree} from './ReactFiberNewContext';
 import {logUncaughtError, logCaughtError} from './ReactFiberErrorLogger';
-import {logComponentSuspended} from './DebugTracing';
 import {isDevToolsPresent} from './ReactFiberDevToolsHook';
 import {
   SyncLane,
@@ -399,15 +397,6 @@ function throwException(
         }
       }
 
-      if (__DEV__) {
-        if (enableDebugTracing) {
-          if (sourceFiber.mode & DebugTracingMode) {
-            const name = getComponentNameFromFiber(sourceFiber) || 'Unknown';
-            logComponentSuspended(name, wakeable);
-          }
-        }
-      }
-
       // Mark the nearest Suspense boundary to switch to rendering a fallback.
       const suspenseBoundary = getSuspenseHandler();
       if (suspenseBoundary !== null) {
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.js b/packages/react-reconciler/src/ReactFiberWorkLoop.js
index f812d16c9c65a..654abfeafcdf6 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.js
@@ -29,7 +29,6 @@ import {
   enableProfilerTimer,
   enableProfilerCommitHooks,
   enableProfilerNestedUpdatePhase,
-  enableDebugTracing,
   enableSchedulingProfiler,
   enableUpdaterTracking,
   enableCache,
@@ -55,16 +54,6 @@ import {
   NormalPriority as NormalSchedulerPriority,
   IdlePriority as IdleSchedulerPriority,
 } from './Scheduler';
-import {
-  logCommitStarted,
-  logCommitStopped,
-  logLayoutEffectsStarted,
-  logLayoutEffectsStopped,
-  logPassiveEffectsStarted,
-  logPassiveEffectsStopped,
-  logRenderStarted,
-  logRenderStopped,
-} from './DebugTracing';
 import {
   logBlockingStart,
   logTransitionStart,
@@ -2249,12 +2238,6 @@ function renderRootSync(
     prepareFreshStack(root, lanes);
   }
 
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      logRenderStarted(lanes);
-    }
-  }
-
   if (enableSchedulingProfiler) {
     markRenderStarted(lanes);
   }
@@ -2349,12 +2332,6 @@ function renderRootSync(
   popDispatcher(prevDispatcher);
   popAsyncDispatcher(prevAsyncDispatcher);
 
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      logRenderStopped();
-    }
-  }
-
   if (enableSchedulingProfiler) {
     markRenderStopped();
   }
@@ -2422,12 +2399,6 @@ function renderRootConcurrent(root: FiberRoot, lanes: Lanes) {
     workInProgressRootIsPrerendering = checkIfRootIsPrerendering(root, lanes);
   }
 
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      logRenderStarted(lanes);
-    }
-  }
-
   if (enableSchedulingProfiler) {
     markRenderStarted(lanes);
   }
@@ -2640,12 +2611,6 @@ function renderRootConcurrent(root: FiberRoot, lanes: Lanes) {
   popAsyncDispatcher(prevAsyncDispatcher);
   executionContext = prevExecutionContext;
 
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      logRenderStopped();
-    }
-  }
-
   // Check if the tree has completed.
   if (workInProgress !== null) {
     // Still work remaining.
@@ -3208,27 +3173,14 @@ function commitRootImpl(
     }
   }
 
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      logCommitStarted(lanes);
-    }
-  }
-
   if (enableSchedulingProfiler) {
     markCommitStarted(lanes);
   }
 
   if (finishedWork === null) {
-    if (__DEV__) {
-      if (enableDebugTracing) {
-        logCommitStopped();
-      }
-    }
-
     if (enableSchedulingProfiler) {
       markCommitStopped();
     }
-
     return null;
   } else {
     if (__DEV__) {
@@ -3394,21 +3346,10 @@ function commitRootImpl(
     // The next phase is the layout phase, where we call effects that read
     // the host tree after it's been mutated. The idiomatic use case for this is
     // layout, but class component lifecycles also fire here for legacy reasons.
-    if (__DEV__) {
-      if (enableDebugTracing) {
-        logLayoutEffectsStarted(lanes);
-      }
-    }
     if (enableSchedulingProfiler) {
       markLayoutEffectsStarted(lanes);
     }
     commitLayoutEffects(finishedWork, root, lanes);
-    if (__DEV__) {
-      if (enableDebugTracing) {
-        logLayoutEffectsStopped();
-      }
-    }
-
     if (enableSchedulingProfiler) {
       markLayoutEffectsStopped();
     }
@@ -3574,12 +3515,6 @@ function commitRootImpl(
   // If layout work was scheduled, flush it now.
   flushSyncWorkOnAllRoots();
 
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      logCommitStopped();
-    }
-  }
-
   if (enableSchedulingProfiler) {
     markCommitStopped();
   }
@@ -3720,10 +3655,6 @@ function flushPassiveEffectsImpl(wasDelayedCommit: void | boolean) {
   if (__DEV__) {
     isFlushingPassiveEffects = true;
     didScheduleUpdateDuringPassiveEffects = false;
-
-    if (enableDebugTracing) {
-      logPassiveEffectsStarted(lanes);
-    }
   }
 
   let passiveEffectStartTime = 0;
@@ -3752,12 +3683,6 @@ function flushPassiveEffectsImpl(wasDelayedCommit: void | boolean) {
     pendingPassiveEffectsRenderEndTime,
   );
 
-  if (__DEV__) {
-    if (enableDebugTracing) {
-      logPassiveEffectsStopped();
-    }
-  }
-
   if (enableSchedulingProfiler) {
     markPassiveEffectsStopped();
   }
diff --git a/packages/react-reconciler/src/__tests__/DebugTracing-test.internal.js b/packages/react-reconciler/src/__tests__/DebugTracing-test.internal.js
deleted file mode 100644
index ba0451c4c5f0b..0000000000000
--- a/packages/react-reconciler/src/__tests__/DebugTracing-test.internal.js
+++ /dev/null
@@ -1,440 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @emails react-core
- */
-
-'use strict';
-
-describe('DebugTracing', () => {
-  let React;
-  let ReactNoop;
-  let waitForPaint;
-  let waitForAll;
-  let act;
-
-  let logs;
-
-  const SYNC_LANE_STRING = '0b0000000000000000000000000000010';
-  const DEFAULT_LANE_STRING = '0b0000000000000000000000000100000';
-  const RETRY_LANE_STRING = '0b0000000010000000000000000000000';
-
-  global.IS_REACT_ACT_ENVIRONMENT = true;
-
-  beforeEach(() => {
-    jest.resetModules();
-
-    React = require('react');
-    ReactNoop = require('react-noop-renderer');
-    const InternalTestUtils = require('internal-test-utils');
-    waitForPaint = InternalTestUtils.waitForPaint;
-    waitForAll = InternalTestUtils.waitForAll;
-    act = InternalTestUtils.act;
-
-    logs = [];
-
-    const groups = [];
-
-    spyOnDevAndProd(console, 'log').mockImplementation(message => {
-      logs.push(`log: ${message.replace(/%c/g, '')}`);
-    });
-    spyOnDevAndProd(console, 'group').mockImplementation(message => {
-      logs.push(`group: ${message.replace(/%c/g, '')}`);
-      groups.push(message);
-    });
-    spyOnDevAndProd(console, 'groupEnd').mockImplementation(() => {
-      const message = groups.pop();
-      logs.push(`groupEnd: ${message.replace(/%c/g, '')}`);
-    });
-  });
-
-  // @gate enableDebugTracing
-  it('should not log anything for sync render without suspends or state updates', async () => {
-    await act(() => {
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <div />
-        </React.unstable_DebugTracingMode>,
-      );
-    });
-
-    expect(logs).toEqual([]);
-  });
-
-  // @gate experimental && enableDebugTracing
-  it('should not log anything for concurrent render without suspends or state updates', async () => {
-    await act(() =>
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <div />
-        </React.unstable_DebugTracingMode>,
-      ),
-    );
-    expect(logs).toEqual([]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing && !disableLegacyMode
-  it('should log sync render with suspense, legacy', async () => {
-    let resolveFakeSuspensePromise;
-    let didResolve = false;
-    const fakeSuspensePromise = new Promise(resolve => {
-      resolveFakeSuspensePromise = () => {
-        didResolve = true;
-        resolve();
-      };
-    });
-
-    function Example() {
-      if (!didResolve) {
-        throw fakeSuspensePromise;
-      }
-      return null;
-    }
-
-    ReactNoop.renderLegacySyncRoot(
-      <React.unstable_DebugTracingMode>
-        <React.Suspense fallback={null}>
-          <Example />
-        </React.Suspense>
-      </React.unstable_DebugTracingMode>,
-    );
-
-    expect(logs).toEqual([
-      `group: ⚛ render (${SYNC_LANE_STRING})`,
-      'log: ⚛ Example suspended',
-      `groupEnd: ⚛ render (${SYNC_LANE_STRING})`,
-    ]);
-
-    logs.splice(0);
-
-    resolveFakeSuspensePromise();
-    await waitForAll([]);
-
-    expect(logs).toEqual(['log: ⚛ Example resolved']);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing && enableCPUSuspense && !disableLegacyMode
-  it('should log sync render with CPU suspense, legacy', async () => {
-    function Example() {
-      console.log('<Example/>');
-      return null;
-    }
-
-    function Wrapper({children}) {
-      console.log('<Wrapper/>');
-      return children;
-    }
-
-    ReactNoop.renderLegacySyncRoot(
-      <React.unstable_DebugTracingMode>
-        <Wrapper>
-          <React.Suspense fallback={null} unstable_expectedLoadTime={1}>
-            <Example />
-          </React.Suspense>
-        </Wrapper>
-      </React.unstable_DebugTracingMode>,
-    );
-
-    expect(logs).toEqual([
-      `group: ⚛ render (${SYNC_LANE_STRING})`,
-      'log: <Wrapper/>',
-      `groupEnd: ⚛ render (${SYNC_LANE_STRING})`,
-    ]);
-
-    logs.splice(0);
-
-    await waitForPaint([]);
-
-    expect(logs).toEqual([
-      `group: ⚛ render (${RETRY_LANE_STRING})`,
-      'log: <Example/>',
-      `groupEnd: ⚛ render (${RETRY_LANE_STRING})`,
-    ]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing
-  it('should log concurrent render with suspense', async () => {
-    let isResolved = false;
-    let resolveFakeSuspensePromise;
-    const fakeSuspensePromise = new Promise(resolve => {
-      resolveFakeSuspensePromise = () => {
-        resolve();
-        isResolved = true;
-      };
-    });
-
-    function Example() {
-      if (!isResolved) {
-        throw fakeSuspensePromise;
-      }
-      return null;
-    }
-
-    await act(() =>
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <React.Suspense fallback={null}>
-            <Example />
-          </React.Suspense>
-        </React.unstable_DebugTracingMode>,
-      ),
-    );
-
-    expect(logs).toEqual([
-      `group: ⚛ render (${DEFAULT_LANE_STRING})`,
-      'log: ⚛ Example suspended',
-      `groupEnd: ⚛ render (${DEFAULT_LANE_STRING})`,
-
-      ...(gate('enableSiblingPrerendering')
-        ? [
-            `group: ⚛ render (${RETRY_LANE_STRING})`,
-            'log: ⚛ Example suspended',
-            `groupEnd: ⚛ render (${RETRY_LANE_STRING})`,
-          ]
-        : []),
-    ]);
-
-    logs.splice(0);
-
-    await act(async () => await resolveFakeSuspensePromise());
-    expect(logs).toEqual([
-      'log: ⚛ Example resolved',
-
-      ...(gate('enableSiblingPrerendering')
-        ? ['log: ⚛ Example resolved']
-        : []),
-    ]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing && enableCPUSuspense
-  it('should log concurrent render with CPU suspense', async () => {
-    function Example() {
-      console.log('<Example/>');
-      return null;
-    }
-
-    function Wrapper({children}) {
-      console.log('<Wrapper/>');
-      return children;
-    }
-
-    await act(() =>
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <Wrapper>
-            <React.Suspense fallback={null} unstable_expectedLoadTime={1}>
-              <Example />
-            </React.Suspense>
-          </Wrapper>
-        </React.unstable_DebugTracingMode>,
-      ),
-    );
-
-    expect(logs).toEqual([
-      `group: ⚛ render (${DEFAULT_LANE_STRING})`,
-      'log: <Wrapper/>',
-      `groupEnd: ⚛ render (${DEFAULT_LANE_STRING})`,
-      `group: ⚛ render (${RETRY_LANE_STRING})`,
-      'log: <Example/>',
-      `groupEnd: ⚛ render (${RETRY_LANE_STRING})`,
-    ]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing
-  it('should log cascading class component updates', async () => {
-    class Example extends React.Component {
-      state = {didMount: false};
-      componentDidMount() {
-        this.setState({didMount: true});
-      }
-      render() {
-        return null;
-      }
-    }
-
-    await act(() =>
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <Example />
-        </React.unstable_DebugTracingMode>,
-      ),
-    );
-
-    expect(logs).toEqual([
-      `group: ⚛ commit (${DEFAULT_LANE_STRING})`,
-      `group: ⚛ layout effects (${DEFAULT_LANE_STRING})`,
-      `log: ⚛ Example updated state (${SYNC_LANE_STRING})`,
-      `groupEnd: ⚛ layout effects (${DEFAULT_LANE_STRING})`,
-      `groupEnd: ⚛ commit (${DEFAULT_LANE_STRING})`,
-    ]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing
-  it('should log render phase state updates for class component', async () => {
-    class Example extends React.Component {
-      state = {didRender: false};
-      render() {
-        if (this.state.didRender === false) {
-          this.setState({didRender: true});
-        }
-        return null;
-      }
-    }
-
-    await expect(async () => {
-      await act(() => {
-        ReactNoop.render(
-          <React.unstable_DebugTracingMode>
-            <Example />
-          </React.unstable_DebugTracingMode>,
-        );
-      });
-    }).toErrorDev(
-      'Cannot update during an existing state transition (such as within `render`). Render methods should be a pure function of props and state.',
-    );
-
-    expect(logs).toEqual([
-      `group: ⚛ render (${DEFAULT_LANE_STRING})`,
-      `log: ⚛ Example updated state (${DEFAULT_LANE_STRING})`,
-      `groupEnd: ⚛ render (${DEFAULT_LANE_STRING})`,
-    ]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing
-  it('should log cascading layout updates', async () => {
-    function Example() {
-      const [didMount, setDidMount] = React.useState(false);
-      React.useLayoutEffect(() => {
-        setDidMount(true);
-      }, []);
-      return didMount;
-    }
-
-    await act(() =>
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <Example />
-        </React.unstable_DebugTracingMode>,
-      ),
-    );
-
-    expect(logs).toEqual([
-      `group: ⚛ commit (${DEFAULT_LANE_STRING})`,
-      `group: ⚛ layout effects (${DEFAULT_LANE_STRING})`,
-      `log: ⚛ Example updated state (${SYNC_LANE_STRING})`,
-      `groupEnd: ⚛ layout effects (${DEFAULT_LANE_STRING})`,
-      `groupEnd: ⚛ commit (${DEFAULT_LANE_STRING})`,
-    ]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing
-  it('should log cascading passive updates', async () => {
-    function Example() {
-      const [didMount, setDidMount] = React.useState(false);
-      React.useEffect(() => {
-        setDidMount(true);
-      }, []);
-      return didMount;
-    }
-
-    await act(() => {
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <Example />
-        </React.unstable_DebugTracingMode>,
-      );
-    });
-    expect(logs).toEqual([
-      `group: ⚛ passive effects (${DEFAULT_LANE_STRING})`,
-      `log: ⚛ Example updated state (${DEFAULT_LANE_STRING})`,
-      `groupEnd: ⚛ passive effects (${DEFAULT_LANE_STRING})`,
-    ]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing
-  it('should log render phase updates', async () => {
-    function Example() {
-      const [didRender, setDidRender] = React.useState(false);
-      if (!didRender) {
-        setDidRender(true);
-      }
-      return didRender;
-    }
-
-    await act(() => {
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <Example />
-        </React.unstable_DebugTracingMode>,
-      );
-    });
-
-    expect(logs).toEqual([
-      `group: ⚛ render (${DEFAULT_LANE_STRING})`,
-      `log: ⚛ Example updated state (${DEFAULT_LANE_STRING})`,
-      `groupEnd: ⚛ render (${DEFAULT_LANE_STRING})`,
-    ]);
-  });
-
-  // @gate experimental && build === 'development' && enableDebugTracing
-  it('should log when user code logs', async () => {
-    function Example() {
-      console.log('Hello from user code');
-      return null;
-    }
-
-    await act(() =>
-      ReactNoop.render(
-        <React.unstable_DebugTracingMode>
-          <Example />
-        </React.unstable_DebugTracingMode>,
-      ),
-    );
-
-    expect(logs).toEqual([
-      `group: ⚛ render (${DEFAULT_LANE_STRING})`,
-      'log: Hello from user code',
-      `groupEnd: ⚛ render (${DEFAULT_LANE_STRING})`,
-    ]);
-  });
-
-  // @gate experimental && enableDebugTracing
-  it('should not log anything outside of a unstable_DebugTracingMode subtree', async () => {
-    function ExampleThatCascades() {
-      const [didMount, setDidMount] = React.useState(false);
-      React.useLayoutEffect(() => {
-        setDidMount(true);
-      }, []);
-      return didMount;
-    }
-
-    const fakeSuspensePromise = {then() {}};
-
-    function ExampleThatSuspends() {
-      throw fakeSuspensePromise;
-    }
-
-    function Example() {
-      return null;
-    }
-
-    await act(() =>
-      ReactNoop.render(
-        <React.Fragment>
-          <ExampleThatCascades />
-          <React.Suspense fallback={null}>
-            <ExampleThatSuspends />
-          </React.Suspense>
-          <React.unstable_DebugTracingMode>
-            <Example />
-          </React.unstable_DebugTracingMode>
-        </React.Fragment>,
-      ),
-    );
-
-    expect(logs).toEqual([]);
-  });
-});
diff --git a/packages/react-server/src/ReactFizzServer.js b/packages/react-server/src/ReactFizzServer.js
index f245861ba0012..e6f0d8e02fd6e 100644
--- a/packages/react-server/src/ReactFizzServer.js
+++ b/packages/react-server/src/ReactFizzServer.js
@@ -136,7 +136,6 @@ import {
   REACT_LAZY_TYPE,
   REACT_SUSPENSE_TYPE,
   REACT_LEGACY_HIDDEN_TYPE,
-  REACT_DEBUG_TRACING_MODE_TYPE,
   REACT_STRICT_MODE_TYPE,
   REACT_PROFILER_TYPE,
   REACT_SUSPENSE_LIST_TYPE,
@@ -2161,7 +2160,6 @@ function renderElement(
     // www build. As a migration step, we could add a special prop to Offscreen
     // that simulates the old behavior (no hiding, no change to effects).
     case REACT_LEGACY_HIDDEN_TYPE:
-    case REACT_DEBUG_TRACING_MODE_TYPE:
     case REACT_STRICT_MODE_TYPE:
     case REACT_PROFILER_TYPE:
     case REACT_FRAGMENT_TYPE: {
diff --git a/packages/react/src/ReactClient.js b/packages/react/src/ReactClient.js
index 478d9e026aae8..90ce18b133a34 100644
--- a/packages/react/src/ReactClient.js
+++ b/packages/react/src/ReactClient.js
@@ -10,7 +10,6 @@
 import ReactVersion from 'shared/ReactVersion';
 import {
   REACT_FRAGMENT_TYPE,
-  REACT_DEBUG_TRACING_MODE_TYPE,
   REACT_PROFILER_TYPE,
   REACT_STRICT_MODE_TYPE,
   REACT_SUSPENSE_TYPE,
@@ -105,7 +104,6 @@ export {
   REACT_FRAGMENT_TYPE as Fragment,
   REACT_PROFILER_TYPE as Profiler,
   REACT_STRICT_MODE_TYPE as StrictMode,
-  REACT_DEBUG_TRACING_MODE_TYPE as unstable_DebugTracingMode,
   REACT_SUSPENSE_TYPE as Suspense,
   createElement,
   cloneElement,
diff --git a/packages/react/src/ReactServer.experimental.development.js b/packages/react/src/ReactServer.experimental.development.js
index ccf423d79ecc7..82aff0d615fb4 100644
--- a/packages/react/src/ReactServer.experimental.development.js
+++ b/packages/react/src/ReactServer.experimental.development.js
@@ -15,7 +15,6 @@ import {
   REACT_PROFILER_TYPE,
   REACT_STRICT_MODE_TYPE,
   REACT_SUSPENSE_TYPE,
-  REACT_DEBUG_TRACING_MODE_TYPE,
 } from 'shared/ReactSymbols';
 import {
   cloneElement,
@@ -71,7 +70,6 @@ export {
   memo,
   cache,
   startTransition,
-  REACT_DEBUG_TRACING_MODE_TYPE as unstable_DebugTracingMode,
   REACT_SUSPENSE_TYPE as unstable_SuspenseList,
   getCacheForType as unstable_getCacheForType,
   postpone as unstable_postpone,
diff --git a/packages/react/src/ReactServer.experimental.js b/packages/react/src/ReactServer.experimental.js
index 97b548f82d6b6..e77e249930e21 100644
--- a/packages/react/src/ReactServer.experimental.js
+++ b/packages/react/src/ReactServer.experimental.js
@@ -15,7 +15,6 @@ import {
   REACT_PROFILER_TYPE,
   REACT_STRICT_MODE_TYPE,
   REACT_SUSPENSE_TYPE,
-  REACT_DEBUG_TRACING_MODE_TYPE,
 } from 'shared/ReactSymbols';
 import {
   cloneElement,
@@ -70,7 +69,6 @@ export {
   memo,
   cache,
   startTransition,
-  REACT_DEBUG_TRACING_MODE_TYPE as unstable_DebugTracingMode,
   REACT_SUSPENSE_TYPE as unstable_SuspenseList,
   getCacheForType as unstable_getCacheForType,
   postpone as unstable_postpone,
diff --git a/packages/shared/ReactFeatureFlags.js b/packages/shared/ReactFeatureFlags.js
index 212afaabc4216..3855fa9b5180c 100644
--- a/packages/shared/ReactFeatureFlags.js
+++ b/packages/shared/ReactFeatureFlags.js
@@ -269,11 +269,6 @@ export const enableProfilerCommitHooks = __PROFILE__;
 // Phase param passed to onRender callback differentiates between an "update" and a "cascading-update".
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
 
-// Adds verbose console logging for e.g. state updates, suspense, and work loop
-// stuff. Intended to enable React core members to more easily debug scheduling
-// issues in DEV builds.
-export const enableDebugTracing = false;
-
 export const enableAsyncDebugInfo = __EXPERIMENTAL__;
 
 // Track which Fiber(s) schedule render work.
diff --git a/packages/shared/ReactSymbols.js b/packages/shared/ReactSymbols.js
index 002870896f00f..0d1208b21af0c 100644
--- a/packages/shared/ReactSymbols.js
+++ b/packages/shared/ReactSymbols.js
@@ -33,9 +33,6 @@ export const REACT_SUSPENSE_LIST_TYPE: symbol = Symbol.for(
 export const REACT_MEMO_TYPE: symbol = Symbol.for('react.memo');
 export const REACT_LAZY_TYPE: symbol = Symbol.for('react.lazy');
 export const REACT_SCOPE_TYPE: symbol = Symbol.for('react.scope');
-export const REACT_DEBUG_TRACING_MODE_TYPE: symbol = Symbol.for(
-  'react.debug_trace_mode',
-);
 export const REACT_OFFSCREEN_TYPE: symbol = Symbol.for('react.offscreen');
 export const REACT_LEGACY_HIDDEN_TYPE: symbol = Symbol.for(
   'react.legacy_hidden',
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index 7493a34494d82..6734444e01dc5 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -47,7 +47,6 @@ export const enableAsyncIterableChildren = false;
 export const enableCache = true;
 export const enableCPUSuspense = true;
 export const enableCreateEventHandleAPI = false;
-export const enableDebugTracing = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableMoveBefore = true;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-oss.js b/packages/shared/forks/ReactFeatureFlags.native-oss.js
index e034a723d7574..d4facd9ad2de5 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-oss.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-oss.js
@@ -34,7 +34,6 @@ export const enableAsyncIterableChildren = false;
 export const enableCache = true;
 export const enableCPUSuspense = false;
 export const enableCreateEventHandleAPI = false;
-export const enableDebugTracing = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableFabricCompleteRootInCommitPhase = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
index fe518f955e949..7e62adb318085 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.js
@@ -11,7 +11,6 @@ import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as ExportsType from './ReactFeatureFlags.test-renderer';
 
 export const debugRenderPhaseSideEffectsForStrictMode = false;
-export const enableDebugTracing = false;
 export const enableAsyncDebugInfo = false;
 export const enableSchedulingProfiler = false;
 export const enableProfilerTimer = __PROFILE__;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
index 0b0da8b8cb326..82ac86a2cdb14 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js
@@ -26,7 +26,6 @@ export const enableAsyncIterableChildren = false;
 export const enableCache = true;
 export const enableCPUSuspense = true;
 export const enableCreateEventHandleAPI = false;
-export const enableDebugTracing = false;
 export const enableDeferRootSchedulingToMicrotask = true;
 export const enableDO_NOT_USE_disableStrictPassiveEffect = false;
 export const enableMoveBefore = false;
diff --git a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
index 63f76b4a3a7c4..21efe3c6d51e8 100644
--- a/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.test-renderer.www.js
@@ -11,7 +11,6 @@ import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
 import typeof * as ExportsType from './ReactFeatureFlags.test-renderer.www';
 
 export const debugRenderPhaseSideEffectsForStrictMode = false;
-export const enableDebugTracing = false;
 export const enableAsyncDebugInfo = false;
 export const enableSchedulingProfiler = false;
 export const enableProfilerTimer = __PROFILE__;
diff --git a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
index 7c28c76fb1392..69da420d0422c 100644
--- a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
@@ -32,12 +32,6 @@ export const retryLaneExpirationMs = 5000;
 export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
 
-// Enable this flag to help with concurrent mode debugging.
-// It logs information to the console about React scheduling, rendering, and commit phases.
-//
-// NOTE: This feature will only work in DEV mode; all callsites are wrapped with __DEV__.
-export const enableDebugTracing = __EXPERIMENTAL__;
-
 export const enableSchedulingProfiler = __VARIANT__;
 
 export const enableInfiniteRenderLoopDetection = __VARIANT__;
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index f54c73a4647d4..ae12e5caf92ea 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -19,7 +19,6 @@ export const {
   disableDefaultPropsExceptForClasses,
   disableLegacyContextForFunctionComponents,
   disableSchedulerTimeoutInWorkLoop,
-  enableDebugTracing,
   enableDeferRootSchedulingToMicrotask,
   enableDO_NOT_USE_disableStrictPassiveEffect,
   enableHiddenSubtreeInsertionEffectCleanup,
diff --git a/packages/shared/isValidElementType.js b/packages/shared/isValidElementType.js
index 6d5397be33e70..346992b118865 100644
--- a/packages/shared/isValidElementType.js
+++ b/packages/shared/isValidElementType.js
@@ -14,7 +14,6 @@ import {
   REACT_FORWARD_REF_TYPE,
   REACT_FRAGMENT_TYPE,
   REACT_PROFILER_TYPE,
-  REACT_DEBUG_TRACING_MODE_TYPE,
   REACT_STRICT_MODE_TYPE,
   REACT_SUSPENSE_TYPE,
   REACT_SUSPENSE_LIST_TYPE,
@@ -28,7 +27,6 @@ import {
 import {
   enableScopeAPI,
   enableTransitionTracing,
-  enableDebugTracing,
   enableLegacyHidden,
   enableRenderableContext,
 } from './ReactFeatureFlags';
@@ -46,7 +44,6 @@ export default function isValidElementType(type: mixed): boolean {
   if (
     type === REACT_FRAGMENT_TYPE ||
     type === REACT_PROFILER_TYPE ||
-    (enableDebugTracing && type === REACT_DEBUG_TRACING_MODE_TYPE) ||
     type === REACT_STRICT_MODE_TYPE ||
     type === REACT_SUSPENSE_TYPE ||
     type === REACT_SUSPENSE_LIST_TYPE ||

From db8ff7fd7c0fc76927c36849fb5d06f8714aa739 Mon Sep 17 00:00:00 2001
From: Rick Hanlon <rickhanlonii@fb.com>
Date: Sat, 14 Dec 2024 13:02:09 -0500
Subject: [PATCH 2/2] fix lint

---
 packages/react-reconciler/src/ReactFiber.js               | 1 -
 packages/react-reconciler/src/ReactFiberClassComponent.js | 7 +------
 packages/react-reconciler/src/ReactFiberHooks.js          | 1 -
 packages/react-reconciler/src/ReactFiberThrow.js          | 2 +-
 packages/react-reconciler/src/ReactTypeOfMode.js          | 4 ++--
 packages/react/index.development.js                       | 1 -
 packages/react/index.experimental.development.js          | 1 -
 packages/react/index.experimental.js                      | 1 -
 packages/react/index.fb.js                                | 1 -
 packages/react/index.js                                   | 1 -
 10 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/packages/react-reconciler/src/ReactFiber.js b/packages/react-reconciler/src/ReactFiber.js
index 23078d1d08925..42f347f4ba956 100644
--- a/packages/react-reconciler/src/ReactFiber.js
+++ b/packages/react-reconciler/src/ReactFiber.js
@@ -79,7 +79,6 @@ import {NoLanes} from './ReactFiberLane';
 import {
   NoMode,
   ConcurrentMode,
-  DebugTracingMode,
   ProfileMode,
   StrictLegacyMode,
   StrictEffectsMode,
diff --git a/packages/react-reconciler/src/ReactFiberClassComponent.js b/packages/react-reconciler/src/ReactFiberClassComponent.js
index cb06536c5da8a..f5d5c96a2a93c 100644
--- a/packages/react-reconciler/src/ReactFiberClassComponent.js
+++ b/packages/react-reconciler/src/ReactFiberClassComponent.js
@@ -34,12 +34,7 @@ import assign from 'shared/assign';
 import isArray from 'shared/isArray';
 import {REACT_CONTEXT_TYPE, REACT_CONSUMER_TYPE} from 'shared/ReactSymbols';
 
-import {
-  DebugTracingMode,
-  NoMode,
-  StrictLegacyMode,
-  StrictEffectsMode,
-} from './ReactTypeOfMode';
+import {NoMode, StrictLegacyMode, StrictEffectsMode} from './ReactTypeOfMode';
 
 import {
   enqueueUpdate,
diff --git a/packages/react-reconciler/src/ReactFiberHooks.js b/packages/react-reconciler/src/ReactFiberHooks.js
index e063715a88f64..11851d213b0fb 100644
--- a/packages/react-reconciler/src/ReactFiberHooks.js
+++ b/packages/react-reconciler/src/ReactFiberHooks.js
@@ -55,7 +55,6 @@ import {
 import {
   NoMode,
   ConcurrentMode,
-  DebugTracingMode,
   StrictEffectsMode,
   StrictLegacyMode,
   NoStrictPassiveEffectsMode,
diff --git a/packages/react-reconciler/src/ReactFiberThrow.js b/packages/react-reconciler/src/ReactFiberThrow.js
index 1db53ff5c31cd..a4bdb84e6c4e7 100644
--- a/packages/react-reconciler/src/ReactFiberThrow.js
+++ b/packages/react-reconciler/src/ReactFiberThrow.js
@@ -37,7 +37,7 @@ import {
   ForceClientRender,
   ScheduleRetry,
 } from './ReactFiberFlags';
-import {NoMode, ConcurrentMode, DebugTracingMode} from './ReactTypeOfMode';
+import {NoMode, ConcurrentMode} from './ReactTypeOfMode';
 import {
   enableLazyContextPropagation,
   enableUpdaterTracking,
diff --git a/packages/react-reconciler/src/ReactTypeOfMode.js b/packages/react-reconciler/src/ReactTypeOfMode.js
index 7542c8eff528c..fd67d9979f8bb 100644
--- a/packages/react-reconciler/src/ReactTypeOfMode.js
+++ b/packages/react-reconciler/src/ReactTypeOfMode.js
@@ -12,8 +12,8 @@ export type TypeOfMode = number;
 export const NoMode = /*                         */ 0b0000000;
 // TODO: Remove ConcurrentMode by reading from the root tag instead
 export const ConcurrentMode = /*                 */ 0b0000001;
-export const ProfileMode = /*                    */ 0b0000010;
-export const DebugTracingMode = /*               */ 0b0000100;
+export const ProfileMode = /*                     */ 0b0000010;
+//export const DebugTracingMode = /*             */ 0b0000100; // Removed
 export const StrictLegacyMode = /*               */ 0b0001000;
 export const StrictEffectsMode = /*              */ 0b0010000;
 export const NoStrictPassiveEffectsMode = /*     */ 0b1000000;
diff --git a/packages/react/index.development.js b/packages/react/index.development.js
index 8472789ba36cd..809e940f070ba 100644
--- a/packages/react/index.development.js
+++ b/packages/react/index.development.js
@@ -45,7 +45,6 @@ export {
   memo,
   cache,
   startTransition,
-  unstable_DebugTracingMode,
   unstable_LegacyHidden,
   unstable_Activity,
   unstable_Scope,
diff --git a/packages/react/index.experimental.development.js b/packages/react/index.experimental.development.js
index d41774e1feedc..cc753cd9c5ed8 100644
--- a/packages/react/index.experimental.development.js
+++ b/packages/react/index.experimental.development.js
@@ -28,7 +28,6 @@ export {
   memo,
   cache,
   startTransition,
-  unstable_DebugTracingMode,
   unstable_Activity,
   unstable_postpone,
   unstable_getCacheForType,
diff --git a/packages/react/index.experimental.js b/packages/react/index.experimental.js
index ae98e3b91f19c..ab97c58caa5d2 100644
--- a/packages/react/index.experimental.js
+++ b/packages/react/index.experimental.js
@@ -28,7 +28,6 @@ export {
   memo,
   cache,
   startTransition,
-  unstable_DebugTracingMode,
   unstable_Activity,
   unstable_postpone,
   unstable_getCacheForType,
diff --git a/packages/react/index.fb.js b/packages/react/index.fb.js
index 4764281481dbb..8cded91b9854d 100644
--- a/packages/react/index.fb.js
+++ b/packages/react/index.fb.js
@@ -33,7 +33,6 @@ export {
   StrictMode,
   Suspense,
   unstable_Activity,
-  unstable_DebugTracingMode,
   unstable_getCacheForType,
   unstable_LegacyHidden,
   unstable_Scope,
diff --git a/packages/react/index.js b/packages/react/index.js
index 2edb0a2c1de09..3e087509ccb06 100644
--- a/packages/react/index.js
+++ b/packages/react/index.js
@@ -46,7 +46,6 @@ export {
   memo,
   cache,
   startTransition,
-  unstable_DebugTracingMode,
   unstable_LegacyHidden,
   unstable_Activity,
   unstable_Scope,