Remove Reconciler fork (2/2) (#25775)

We've heard from multiple contributors that the Reconciler forking
mechanism was confusing and/or annoying to deal with. Since it's
currently unused and there's no immediate plans to start using it again,
this removes the forking.

Fully removing the fork is split into 2 steps to preserve file history:

**#25774 previous PR that did the bulk of the work:**
- remove `enableNewReconciler` feature flag.
- remove `unstable_isNewReconciler` export
- remove eslint rules for cross fork imports
- remove `*.new.js` files and update imports
- merge non-suffixed files into `*.old` files where both exist
(sometimes types were defined there)

**This PR**
- rename `*.old` files

Author: kassens

packages/react-art/src/ReactART.js

@@ -12,7 +12,7 @@ import {
   createContainer,
   updateContainer,
   injectIntoDevTools,
-} from 'react-reconciler/src/ReactFiberReconciler.old';
+} from 'react-reconciler/src/ReactFiberReconciler';
 import Transform from 'art/core/transform';
 import Mode from 'art/modes/current';
 import FastNoSideEffects from 'art/modes/fast-noSideEffects';

packages/react-art/src/ReactARTHostConfig.js

@@ -10,7 +10,7 @@ import Mode from 'art/modes/current';
 
 import {TYPES, EVENT_TYPES, childrenAsString} from './ReactARTInternals';
 
-import {DefaultEventPriority} from 'react-reconciler/src/ReactEventPriorities.old';
+import {DefaultEventPriority} from 'react-reconciler/src/ReactEventPriorities';
 
 const pooledTransform = new Transform();
 

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

@@ -29,7 +29,7 @@ import {
   markNodeAsResource,
 } from './ReactDOMComponentTree';
 import {HTML_NAMESPACE, SVG_NAMESPACE} from '../shared/DOMNamespaces';
-import {getCurrentRootHostContainer} from 'react-reconciler/src/ReactFiberHostContext.old';
+import {getCurrentRootHostContainer} from 'react-reconciler/src/ReactFiberHostContext';
 
 // The resource types we support. currently they match the form for the as argument.
 // In the future this may need to change, especially when modules / scripts are supported

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

@@ -7,7 +7,7 @@
  * @flow
  */
 
-import type {EventPriority} from 'react-reconciler/src/ReactEventPriorities.old';
+import type {EventPriority} from 'react-reconciler/src/ReactEventPriorities';
 import type {DOMEventName} from '../events/DOMEventNames';
 import type {Fiber, FiberRoot} from 'react-reconciler/src/ReactInternalTypes';
 import type {
@@ -81,7 +81,7 @@ import {
 } from 'react-reconciler/src/ReactWorkTags';
 import {listenToAllSupportedEvents} from '../events/DOMPluginEventSystem';
 
-import {DefaultEventPriority} from 'react-reconciler/src/ReactEventPriorities.old';
+import {DefaultEventPriority} from 'react-reconciler/src/ReactEventPriorities';
 
 // TODO: Remove this deep import when we delete the legacy root API
 import {ConcurrentMode, NoMode} from 'react-reconciler/src/ReactTypeOfMode';

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

@@ -7,7 +7,7 @@
  * @flow
  */
 
-import type {EventPriority} from 'react-reconciler/src/ReactEventPriorities.old';
+import type {EventPriority} from 'react-reconciler/src/ReactEventPriorities';
 import type {AnyNativeEvent} from '../events/PluginModuleType';
 import type {Fiber, FiberRoot} from 'react-reconciler/src/ReactInternalTypes';
 import type {Container, SuspenseInstance} from '../client/ReactDOMHostConfig';
@@ -52,7 +52,7 @@ import {
   IdleEventPriority,
   getCurrentUpdatePriority,
   setCurrentUpdatePriority,
-} from 'react-reconciler/src/ReactEventPriorities.old';
+} from 'react-reconciler/src/ReactEventPriorities';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 import {isRootDehydrated} from 'react-reconciler/src/ReactFiberShellHydration';
 

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

@@ -12,7 +12,7 @@ import type {Container, SuspenseInstance} from '../client/ReactDOMHostConfig';
 import type {DOMEventName} from '../events/DOMEventNames';
 import type {EventSystemFlags} from './EventSystemFlags';
 import type {FiberRoot} from 'react-reconciler/src/ReactInternalTypes';
-import type {EventPriority} from 'react-reconciler/src/ReactEventPriorities.old';
+import type {EventPriority} from 'react-reconciler/src/ReactEventPriorities';
 
 import {enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay} from 'shared/ReactFeatureFlags';
 import {
@@ -35,7 +35,7 @@ import {
   getClosestInstanceFromNode,
 } from '../client/ReactDOMComponentTree';
 import {HostRoot, SuspenseComponent} from 'react-reconciler/src/ReactWorkTags';
-import {isHigherEventPriority} from 'react-reconciler/src/ReactEventPriorities.old';
+import {isHigherEventPriority} from 'react-reconciler/src/ReactEventPriorities';
 import {isRootDehydrated} from 'react-reconciler/src/ReactFiberShellHydration';
 
 let _attemptSynchronousHydration: (fiber: Object) => void;

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

@@ -43,11 +43,11 @@ import {
   attemptDiscreteHydration,
   attemptContinuousHydration,
   attemptHydrationAtCurrentPriority,
-} from 'react-reconciler/src/ReactFiberReconciler.old';
+} from 'react-reconciler/src/ReactFiberReconciler';
 import {
   runWithPriority,
   getCurrentUpdatePriority,
-} from 'react-reconciler/src/ReactEventPriorities.old';
+} from 'react-reconciler/src/ReactEventPriorities';
 import {createPortal as createPortalImpl} from 'react-reconciler/src/ReactPortal';
 import {canUseDOM} from 'shared/ExecutionEnvironment';
 import ReactVersion from 'shared/ReactVersion';

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

@@ -37,7 +37,7 @@ import {
   getPublicRootInstance,
   findHostInstance,
   findHostInstanceWithWarning,
-} from 'react-reconciler/src/ReactFiberReconciler.old';
+} from 'react-reconciler/src/ReactFiberReconciler';
 import {LegacyRoot} from 'react-reconciler/src/ReactRootTags';
 import getComponentNameFromType from 'shared/getComponentNameFromType';
 import ReactSharedInternals from 'shared/ReactSharedInternals';

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

@@ -76,7 +76,7 @@ import {
   registerMutableSourceForHydration,
   flushSync,
   isAlreadyRendering,
-} from 'react-reconciler/src/ReactFiberReconciler.old';
+} from 'react-reconciler/src/ReactFiberReconciler';
 import {ConcurrentRoot} from 'react-reconciler/src/ReactRootTags';
 
 /* global reportError */

packages/react-dom/unstable_testing.classic.fb.js

@@ -19,4 +19,4 @@ export {
   findBoundingRects,
   focusWithin,
   observeVisibleRects,
-} from 'react-reconciler/src/ReactFiberReconciler.old';
+} from 'react-reconciler/src/ReactFiberReconciler';