diff --git a/packages/react-devtools-shared/src/backend/ReactFiberFlags.js b/packages/react-devtools-shared/src/backend/ReactFiberFlags.js
deleted file mode 100644
index 8cc47dc7ce442..0000000000000
--- a/packages/react-devtools-shared/src/backend/ReactFiberFlags.js
+++ /dev/null
@@ -1,17 +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
- */
-
-// This list of flags must be synced with the following file:
-// https://github.com/facebook/react/blob/main/packages/react-reconciler/src/ReactFiberFlags.js
-
-export const NoFlags = /*                      */ 0b000000000000000000000000000;
-export const PerformedWork = /*                */ 0b000000000000000000000000001;
-export const Placement = /*                    */ 0b000000000000000000000000010;
-export const DidCapture = /*                   */ 0b000000000000000000010000000;
-export const Hydrating = /*                    */ 0b000000000000001000000000000;
diff --git a/packages/react-devtools-shared/src/backend/renderer.js b/packages/react-devtools-shared/src/backend/renderer.js
index 00558a4bf77fa..d37497078e43f 100644
--- a/packages/react-devtools-shared/src/backend/renderer.js
+++ b/packages/react-devtools-shared/src/backend/renderer.js
@@ -88,13 +88,6 @@ import {
   MEMO_SYMBOL_STRING,
   SERVER_CONTEXT_SYMBOL_STRING,
 } from './ReactSymbols';
-import {
-  DidCapture,
-  NoFlags,
-  PerformedWork,
-  Placement,
-  Hydrating,
-} from './ReactFiberFlags';
 import {format} from './utils';
 import {
   enableProfilerChangedHookIndices,
@@ -1555,7 +1548,10 @@ export function attach(
       case ForwardRef:
         // For types that execute user code, we check PerformedWork effect.
         // We don't reflect bailouts (either referential or sCU) in DevTools.
-        // eslint-disable-next-line no-bitwise
+        // TODO: This flag is a leaked implementation detail. Once we start
+        // releasing DevTools in lockstep with React, we should import a
+        // function from the reconciler instead.
+        const PerformedWork = 0b000000000000000000000000001;
         return (getFiberFlags(nextFiber) & PerformedWork) === PerformedWork;
       // Note: ContextConsumer only gets PerformedWork effect in 16.3.3+
       // so it won't get highlighted with React 16.3.0 to 16.3.2.
@@ -2843,7 +2839,12 @@ export function attach(
       let nextNode: Fiber = node;
       do {
         node = nextNode;
-        if ((node.flags & (Placement | Hydrating)) !== NoFlags) {
+        // TODO: This function, and these flags, are a leaked implementation
+        // detail. Once we start releasing DevTools in lockstep with React, we
+        // should import a function from the reconciler instead.
+        const Placement = 0b000000000000000000000000010;
+        const Hydrating = 0b000000000000001000000000000;
+        if ((node.flags & (Placement | Hydrating)) !== 0) {
           // This is an insertion or in-progress hydration. The nearest possible
           // mounted fiber is the parent but we need to continue to figure out
           // if that one is still mounted.
@@ -3300,16 +3301,21 @@ export function attach(
     const errors = fiberIDToErrorsMap.get(id) || new Map();
     const warnings = fiberIDToWarningsMap.get(id) || new Map();
 
-    const isErrored =
-      (fiber.flags & DidCapture) !== NoFlags ||
-      forceErrorForFiberIDs.get(id) === true;
-
+    let isErrored = false;
     let targetErrorBoundaryID;
     if (isErrorBoundary(fiber)) {
       // if the current inspected element is an error boundary,
       // either that we want to use it to toggle off error state
       // or that we allow to force error state on it if it's within another
       // error boundary
+      //
+      // TODO: This flag is a leaked implementation detail. Once we start
+      // releasing DevTools in lockstep with React, we should import a function
+      // from the reconciler instead.
+      const DidCapture = 0b000000000000000000010000000;
+      isErrored =
+        (fiber.flags & DidCapture) !== 0 ||
+        forceErrorForFiberIDs.get(id) === true;
       targetErrorBoundaryID = isErrored ? id : getNearestErrorBoundaryID(fiber);
     } else {
       targetErrorBoundaryID = getNearestErrorBoundaryID(fiber);