Notify FragmentInstance of added/removed text

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

@@ -3544,40 +3544,48 @@ export function updateFragmentInstanceFiber(
 }
 
 export function commitNewChildToFragmentInstance(
-  childInstance: InstanceWithFragmentHandles,
+  childInstance: InstanceWithFragmentHandles | Text,
   fragmentInstance: FragmentInstanceType,
 ): void {
+  if (childInstance.nodeType === TEXT_NODE) {
+    return;
+  }
+  const instance: InstanceWithFragmentHandles = (childInstance: any);
   const eventListeners = fragmentInstance._eventListeners;
   if (eventListeners !== null) {
     for (let i = 0; i < eventListeners.length; i++) {
       const {type, listener, optionsOrUseCapture} = eventListeners[i];
-      childInstance.addEventListener(type, listener, optionsOrUseCapture);
+      instance.addEventListener(type, listener, optionsOrUseCapture);
     }
   }
   if (fragmentInstance._observers !== null) {
     fragmentInstance._observers.forEach(observer => {
-      observer.observe(childInstance);
+      observer.observe(instance);
     });
   }
   if (enableFragmentRefsInstanceHandles) {
-    addFragmentHandleToInstance(childInstance, fragmentInstance);
+    addFragmentHandleToInstance(instance, fragmentInstance);
   }
 }
 
 export function deleteChildFromFragmentInstance(
-  childInstance: InstanceWithFragmentHandles,
+  childInstance: InstanceWithFragmentHandles | Text,
   fragmentInstance: FragmentInstanceType,
 ): void {
+  if (childInstance.nodeType === TEXT_NODE) {
+    return;
+  }
+  const instance: InstanceWithFragmentHandles = (childInstance: any);
   const eventListeners = fragmentInstance._eventListeners;
   if (eventListeners !== null) {
     for (let i = 0; i < eventListeners.length; i++) {
       const {type, listener, optionsOrUseCapture} = eventListeners[i];
-      childInstance.removeEventListener(type, listener, optionsOrUseCapture);
+      instance.removeEventListener(type, listener, optionsOrUseCapture);
     }
   }
   if (enableFragmentRefsInstanceHandles) {
-    if (childInstance.unstable_reactFragments != null) {
-      childInstance.unstable_reactFragments.delete(fragmentInstance);
+    if (instance.unstable_reactFragments != null) {
+      instance.unstable_reactFragments.delete(fragmentInstance);
     }
   }
 }

packages/react-native-renderer/src/ReactFiberConfigFabric.js

@@ -40,7 +40,10 @@ import {
   type PublicTextInstance,
   type PublicRootInstance,
 } from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
-import {enableFragmentRefsInstanceHandles} from 'shared/ReactFeatureFlags';
+import {
+  enableFragmentRefsInstanceHandles,
+  enableFragmentRefsTextNodes,
+} from 'shared/ReactFeatureFlags';
 
 const {
   createNode,
@@ -847,10 +850,15 @@ export function updateFragmentInstanceFiber(
 }
 
 export function commitNewChildToFragmentInstance(
-  childInstance: Instance,
+  childInstance: Instance | TextInstance,
   fragmentInstance: FragmentInstanceType,
 ): void {
-  const publicInstance = getPublicInstance(childInstance);
+  // Text nodes are not observable
+  if (enableFragmentRefsTextNodes && childInstance.canonical == null) {
+    return;
+  }
+  const instance: Instance = (childInstance: any);
+  const publicInstance = getPublicInstance(instance);
   if (fragmentInstance._observers !== null) {
     if (publicInstance == null) {
       throw new Error('Expected to find a host node. This is a bug in React.');
@@ -869,11 +877,16 @@ export function commitNewChildToFragmentInstance(
 }
 
 export function deleteChildFromFragmentInstance(
-  childInstance: Instance,
+  childInstance: Instance | TextInstance,
   fragmentInstance: FragmentInstanceType,
 ): void {
+  // Text nodes are not observable
+  if (enableFragmentRefsTextNodes && childInstance.canonical == null) {
+    return;
+  }
+  const instance: Instance = (childInstance: any);
   const publicInstance = ((getPublicInstance(
-    childInstance,
+    instance,
   ): any): PublicInstanceWithFragmentHandles);
   if (enableFragmentRefsInstanceHandles) {
     if (publicInstance.unstable_reactFragments != null) {

packages/react-reconciler/src/ReactFiberCommitHostEffects.js

@@ -64,7 +64,10 @@ import {captureCommitPhaseError} from './ReactFiberWorkLoop';
 import {trackHostMutation} from './ReactFiberMutationTracking';
 
 import {runWithFiberInDEV} from './ReactCurrentFiber';
-import {enableFragmentRefs} from 'shared/ReactFeatureFlags';
+import {
+  enableFragmentRefs,
+  enableFragmentRefsTextNodes,
+} from 'shared/ReactFeatureFlags';
 
 export function commitHostMount(finishedWork: Fiber) {
   const type = finishedWork.type;
@@ -258,7 +261,8 @@ export function commitNewChildToFragmentInstances(
   parentFragmentInstances: null | Array<FragmentInstanceType>,
 ): void {
   if (
-    fiber.tag !== HostComponent ||
+    (fiber.tag !== HostComponent &&
+      !(enableFragmentRefsTextNodes && fiber.tag === HostText)) ||
     // Only run fragment insertion effects for initial insertions
     fiber.alternate !== null ||
     parentFragmentInstances === null

packages/react-reconciler/src/ReactFiberCommitWork.js

@@ -61,6 +61,7 @@ import {
   enableFragmentRefs,
   enableEagerAlternateStateNodeCleanup,
   enableDefaultTransitionIndicator,
+  enableFragmentRefsTextNodes,
 } from 'shared/ReactFeatureFlags';
 import {
   FunctionComponent,
@@ -1532,7 +1533,11 @@ function commitDeletionEffectsOnFiber(
       if (!offscreenSubtreeWasHidden) {
         safelyDetachRef(deletedFiber, nearestMountedAncestor);
       }
-      if (enableFragmentRefs && deletedFiber.tag === HostComponent) {
+      if (
+        enableFragmentRefs &&
+        (deletedFiber.tag === HostComponent ||
+          (enableFragmentRefsTextNodes && deletedFiber.tag === HostText))
+      ) {
         commitFragmentInstanceDeletionEffects(deletedFiber);
       }
       // Intentional fallthrough to next branch
@@ -3009,7 +3014,11 @@ export function disappearLayoutEffects(finishedWork: Fiber) {
       // TODO (Offscreen) Check: flags & RefStatic
       safelyDetachRef(finishedWork, finishedWork.return);
 
-      if (enableFragmentRefs && finishedWork.tag === HostComponent) {
+      if (
+        enableFragmentRefs &&
+        (finishedWork.tag === HostComponent ||
+          (enableFragmentRefsTextNodes && finishedWork.tag === HostText))
+      ) {
         commitFragmentInstanceDeletionEffects(finishedWork);
       }