Remove useMutableSource (facebook#27011)

## Summary

This PR cleans up `useMutableSource`. This has been blocked by a
remaining dependency internally at Meta, but that has now been deleted.

<!--
Explain the **motivation** for making this change. What existing problem
does the pull request solve?
-->

## How did you test this change?

```
yarn flow
yarn lint
yarn test --prod
```

<!--
Demonstrate the code is solid. Example: The exact commands you ran and
their output, screenshots / videos if the pull request changes the user
interface.
How exactly did you verify that your PR solves the issue you wanted to
solve?
  If you leave this empty, your PR will very likely be closed.
-->

Author: noahlemen

packages/react-debug-tools/src/ReactDebugHooks.js

@@ -8,9 +8,6 @@
  */
 
 import type {
-  MutableSource,
-  MutableSourceGetSnapshotFn,
-  MutableSourceSubscribeFn,
   ReactContext,
   ReactProviderType,
   StartTransitionOptions,
@@ -273,23 +270,6 @@ function useMemo<T>(
   return value;
 }
 
-function useMutableSource<Source, Snapshot>(
-  source: MutableSource<Source>,
-  getSnapshot: MutableSourceGetSnapshotFn<Source, Snapshot>,
-  subscribe: MutableSourceSubscribeFn<Source, Snapshot>,
-): Snapshot {
-  // useMutableSource() composes multiple hooks internally.
-  // Advance the current hook index the same number of times
-  // so that subsequent hooks have the right memoized state.
-  nextHook(); // MutableSource
-  nextHook(); // State
-  nextHook(); // Effect
-  nextHook(); // Effect
-  const value = getSnapshot(source._source);
-  hookLog.push({primitive: 'MutableSource', stackError: new Error(), value});
-  return value;
-}
-
 function useSyncExternalStore<T>(
   subscribe: (() => void) => () => void,
   getSnapshot: () => T,
@@ -396,7 +376,6 @@ const Dispatcher: DispatcherType = {
   useRef,
   useState,
   useTransition,
-  useMutableSource,
   useSyncExternalStore,
   useDeferredValue,
   useId,

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

@@ -1036,52 +1036,6 @@ describe('ReactHooksInspectionIntegration', () => {
     ]);
   });
 
-  // @gate enableUseMutableSource
-  it('should support composite useMutableSource hook', () => {
-    const createMutableSource =
-      React.createMutableSource || React.unstable_createMutableSource;
-    const useMutableSource =
-      React.useMutableSource || React.unstable_useMutableSource;
-
-    const mutableSource = createMutableSource({}, () => 1);
-    function Foo(props) {
-      useMutableSource(
-        mutableSource,
-        () => 'snapshot',
-        () => {},
-      );
-      React.useMemo(() => 'memo', []);
-      React.useMemo(() => 'not used', []);
-      return <div />;
-    }
-    const renderer = ReactTestRenderer.create(<Foo />);
-    const childFiber = renderer.root.findByType(Foo)._currentFiber();
-    const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);
-    expect(tree).toEqual([
-      {
-        id: 0,
-        isStateEditable: false,
-        name: 'MutableSource',
-        value: 'snapshot',
-        subHooks: [],
-      },
-      {
-        id: 1,
-        isStateEditable: false,
-        name: 'Memo',
-        value: 'memo',
-        subHooks: [],
-      },
-      {
-        id: 2,
-        isStateEditable: false,
-        name: 'Memo',
-        value: 'not used',
-        subHooks: [],
-      },
-    ]);
-  });
-
   it('should support composite useSyncExternalStore hook', () => {
     const useSyncExternalStore = React.useSyncExternalStore;
     function Foo() {

packages/react-dom/src/client/ReactDOMRoot.js

@@ -7,7 +7,7 @@
  * @flow
  */
 
-import type {MutableSource, ReactNodeList} from 'shared/ReactTypes';
+import type {ReactNodeList} from 'shared/ReactTypes';
 import type {
   FiberRoot,
   TransitionTracingCallbacks,
@@ -47,7 +47,6 @@ export type CreateRootOptions = {
 
 export type HydrateRootOptions = {
   // Hydration options
-  hydratedSources?: Array<MutableSource<any>>,
   onHydrated?: (suspenseNode: Comment) => void,
   onDeleted?: (suspenseNode: Comment) => void,
   // Options for all roots
@@ -77,7 +76,6 @@ import {
   createHydrationContainer,
   updateContainer,
   findHostInstanceWithNoPortals,
-  registerMutableSourceForHydration,
   flushSync,
   isAlreadyRendering,
 } from 'react-reconciler/src/ReactFiberReconciler';
@@ -298,8 +296,6 @@ export function hydrateRoot(
   // For now we reuse the whole bag of options since they contain
   // the hydration callbacks.
   const hydrationCallbacks = options != null ? options : null;
-  // TODO: Delete this option
-  const mutableSources = (options != null && options.hydratedSources) || null;
 
   let isStrictMode = false;
   let concurrentUpdatesByDefaultOverride = false;
@@ -344,13 +340,6 @@ export function hydrateRoot(
   // This can't be a comment node since hydration doesn't work on comment nodes anyway.
   listenToAllSupportedEvents(container);
 
-  if (mutableSources) {
-    for (let i = 0; i < mutableSources.length; i++) {
-      const mutableSource = mutableSources[i];
-      registerMutableSourceForHydration(root, mutableSource);
-    }
-  }
-
   // $FlowFixMe[invalid-constructor] Flow no longer supports calling new on functions
   return new ReactDOMHydrationRoot(root);
 }

packages/react-reconciler/src/ReactFiberBeginWork.js

@@ -11,7 +11,6 @@ import type {
   ReactProviderType,
   ReactContext,
   ReactNodeList,
-  MutableSource,
 } from 'shared/ReactTypes';
 import type {LazyComponent as LazyComponentType} from 'react/src/ReactLazy';
 import type {Fiber, FiberRoot} from './ReactInternalTypes';
@@ -106,7 +105,6 @@ import {
   enableTransitionTracing,
   enableLegacyHidden,
   enableCPUSuspense,
-  enableUseMutableSource,
   enableFloat,
   enableHostSingletons,
   enableFormActions,
@@ -261,7 +259,6 @@ import {
   getWorkInProgressRoot,
 } from './ReactFiberWorkLoop';
 import {enqueueConcurrentRenderForLane} from './ReactFiberConcurrentUpdates';
-import {setWorkInProgressVersion} from './ReactMutableSource';
 import {pushCacheProvider, CacheContext} from './ReactFiberCacheComponent';
 import {
   createCapturedValue,
@@ -1533,19 +1530,6 @@ function updateHostRoot(
     } else {
       // The outermost shell has not hydrated yet. Start hydrating.
       enterHydrationState(workInProgress);
-      if (enableUseMutableSource) {
-        const mutableSourceEagerHydrationData =
-          root.mutableSourceEagerHydrationData;
-        if (mutableSourceEagerHydrationData != null) {
-          for (let i = 0; i < mutableSourceEagerHydrationData.length; i += 2) {
-            const mutableSource = ((mutableSourceEagerHydrationData[
-              i
-            ]: any): MutableSource<any>);
-            const version = mutableSourceEagerHydrationData[i + 1];
-            setWorkInProgressVersion(mutableSource, version);
-          }
-        }
-      }
 
       const child = mountChildFibers(
         workInProgress,

packages/react-reconciler/src/ReactFiberCompleteWork.js

@@ -41,8 +41,6 @@ import {
   diffInCommitPhase,
 } from 'shared/ReactFeatureFlags';
 
-import {resetWorkInProgressVersions as resetMutableSourceWorkInProgressVersions} from './ReactMutableSource';
-
 import {now} from './Scheduler';
 
 import {
@@ -1038,7 +1036,6 @@ function completeWork(
       popRootTransition(workInProgress, fiberRoot, renderLanes);
       popHostContainer(workInProgress);
       popTopLevelLegacyContextObject(workInProgress);
-      resetMutableSourceWorkInProgressVersions();
       if (fiberRoot.pendingContext) {
         fiberRoot.context = fiberRoot.pendingContext;
         fiberRoot.pendingContext = null;