Land enableNativeEventPriorityInference (#20955)

* Land enableNativeEventPriorityInference

* Move schedulerPriorityToLanePriority

* Remove obsolete comment

packages/react-dom/src/__tests__/ReactDOMNativeEventHeuristic-test.js

@@ -43,7 +43,6 @@ describe('ReactDOMNativeEventHeuristic-test', () => {
   }
 
   // @gate experimental
-  // @gate enableNativeEventPriorityInference
   it('ignores discrete events on a pending removed element', async () => {
     const disableButtonRef = React.createRef();
     const submitButtonRef = React.createRef();
@@ -95,7 +94,6 @@ describe('ReactDOMNativeEventHeuristic-test', () => {
   });
 
   // @gate experimental
-  // @gate enableNativeEventPriorityInference
   it('ignores discrete events on a pending removed event listener', async () => {
     const disableButtonRef = React.createRef();
     const submitButtonRef = React.createRef();
@@ -165,7 +163,6 @@ describe('ReactDOMNativeEventHeuristic-test', () => {
   });
 
   // @gate experimental
-  // @gate enableNativeEventPriorityInference
   it('uses the newest discrete events on a pending changed event listener', async () => {
     const enableButtonRef = React.createRef();
     const submitButtonRef = React.createRef();
@@ -229,7 +226,6 @@ describe('ReactDOMNativeEventHeuristic-test', () => {
   });
 
   // @gate experimental
-  // @gate enableNativeEventPriorityInference
   it('mouse over should be user-blocking but not discrete', async () => {
     const root = ReactDOM.unstable_createRoot(container);
 
@@ -260,7 +256,6 @@ describe('ReactDOMNativeEventHeuristic-test', () => {
   });
 
   // @gate experimental
-  // @gate enableNativeEventPriorityInference
   it('mouse enter should be user-blocking but not discrete', async () => {
     const root = ReactDOM.unstable_createRoot(container);
 

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

@@ -8,7 +8,10 @@
  */
 
 import type {AnyNativeEvent} from '../events/PluginModuleType';
-import type {FiberRoot} from 'react-reconciler/src/ReactInternalTypes';
+import type {
+  FiberRoot,
+  ReactPriorityLevel,
+} from 'react-reconciler/src/ReactInternalTypes';
 import type {Container, SuspenseInstance} from '../client/ReactDOMHostConfig';
 import type {DOMEventName} from '../events/DOMEventNames';
 
@@ -50,18 +53,27 @@ import {
   DefaultLanePriority as DefaultLanePriority_old,
   getCurrentUpdateLanePriority as getCurrentUpdateLanePriority_old,
   setCurrentUpdateLanePriority as setCurrentUpdateLanePriority_old,
-  schedulerPriorityToLanePriority as schedulerPriorityToLanePriority_old,
 } from 'react-reconciler/src/ReactFiberLane.old';
 import {
   InputDiscreteLanePriority as InputDiscreteLanePriority_new,
   InputContinuousLanePriority as InputContinuousLanePriority_new,
   DefaultLanePriority as DefaultLanePriority_new,
   getCurrentUpdateLanePriority as getCurrentUpdateLanePriority_new,
   setCurrentUpdateLanePriority as setCurrentUpdateLanePriority_new,
-  schedulerPriorityToLanePriority as schedulerPriorityToLanePriority_new,
+  SyncLanePriority,
+  IdleLanePriority,
+  NoLanePriority,
 } from 'react-reconciler/src/ReactFiberLane.new';
 import {getCurrentPriorityLevel as getCurrentPriorityLevel_old} from 'react-reconciler/src/SchedulerWithReactIntegration.old';
-import {getCurrentPriorityLevel as getCurrentPriorityLevel_new} from 'react-reconciler/src/SchedulerWithReactIntegration.new';
+import {
+  getCurrentPriorityLevel as getCurrentPriorityLevel_new,
+  IdlePriority as IdleSchedulerPriority,
+  ImmediatePriority as ImmediateSchedulerPriority,
+  LowPriority as LowSchedulerPriority,
+  NormalPriority as NormalSchedulerPriority,
+  UserBlockingPriority as UserBlockingSchedulerPriority,
+} from 'react-reconciler/src/SchedulerWithReactIntegration.new';
+import type {LanePriority} from 'react-reconciler/src/ReactFiberLane.new';
 
 const InputDiscreteLanePriority = enableNewReconciler
   ? InputDiscreteLanePriority_new
@@ -78,13 +90,29 @@ const getCurrentUpdateLanePriority = enableNewReconciler
 const setCurrentUpdateLanePriority = enableNewReconciler
   ? setCurrentUpdateLanePriority_new
   : setCurrentUpdateLanePriority_old;
-const schedulerPriorityToLanePriority = enableNewReconciler
-  ? schedulerPriorityToLanePriority_new
-  : schedulerPriorityToLanePriority_old;
 const getCurrentPriorityLevel = enableNewReconciler
   ? getCurrentPriorityLevel_new
   : getCurrentPriorityLevel_old;
 
+function schedulerPriorityToLanePriority(
+  schedulerPriorityLevel: ReactPriorityLevel,
+): LanePriority {
+  switch (schedulerPriorityLevel) {
+    case ImmediateSchedulerPriority:
+      return SyncLanePriority;
+    case UserBlockingSchedulerPriority:
+      return InputContinuousLanePriority;
+    case NormalSchedulerPriority:
+    case LowSchedulerPriority:
+      // TODO: Handle LowSchedulerPriority, somehow. Maybe the same lane as hydration.
+      return DefaultLanePriority;
+    case IdleSchedulerPriority:
+      return IdleLanePriority;
+    default:
+      return NoLanePriority;
+  }
+}
+
 // TODO: can we stop exporting these?
 export let _enabled = true;
 
@@ -410,8 +438,6 @@ export function getEventPriority(domEventName: DOMEventName): * {
       // Eventually this mechanism will be replaced by a check
       // of the current priority on the native scheduler.
       const schedulerPriority = getCurrentPriorityLevel();
-      // TODO: Inline schedulerPriorityToLanePriority into this file
-      // when we delete the enableNativeEventPriorityInference flag.
       return schedulerPriorityToLanePriority(schedulerPriority);
     }
     default:

packages/react-noop-renderer/src/createReactNoop.js

@@ -27,7 +27,6 @@ import {
   LegacyRoot,
 } from 'react-reconciler/src/ReactRootTags';
 
-import {enableNativeEventPriorityInference} from 'shared/ReactFeatureFlags';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 import enqueueTask from 'shared/enqueueTask';
 const {IsSomeRendererActing} = ReactSharedInternals;
@@ -934,19 +933,12 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
     discreteUpdates: NoopRenderer.discreteUpdates,
 
     idleUpdates<T>(fn: () => T): T {
-      if (enableNativeEventPriorityInference) {
-        const prevEventPriority = currentEventPriority;
-        currentEventPriority = NoopRenderer.IdleEventPriority;
-        try {
-          fn();
-        } finally {
-          currentEventPriority = prevEventPriority;
-        }
-      } else {
-        return Scheduler.unstable_runWithPriority(
-          Scheduler.unstable_IdlePriority,
-          fn,
-        );
+      const prevEventPriority = currentEventPriority;
+      currentEventPriority = NoopRenderer.IdleEventPriority;
+      try {
+        fn();
+      } finally {
+        currentEventPriority = prevEventPriority;
       }
     },
 

packages/react-reconciler/src/ReactFiberLane.new.js

@@ -42,7 +42,6 @@ import {
   ImmediatePriority as ImmediateSchedulerPriority,
   UserBlockingPriority as UserBlockingSchedulerPriority,
   NormalPriority as NormalSchedulerPriority,
-  LowPriority as LowSchedulerPriority,
   IdlePriority as IdleSchedulerPriority,
   NoPriority as NoSchedulerPriority,
 } from './SchedulerWithReactIntegration.new';
@@ -275,25 +274,6 @@ function getHighestPriorityLanes(lanes: Lanes | Lane): Lanes {
   }
 }
 
-export function schedulerPriorityToLanePriority(
-  schedulerPriorityLevel: ReactPriorityLevel,
-): LanePriority {
-  switch (schedulerPriorityLevel) {
-    case ImmediateSchedulerPriority:
-      return SyncLanePriority;
-    case UserBlockingSchedulerPriority:
-      return InputContinuousLanePriority;
-    case NormalSchedulerPriority:
-    case LowSchedulerPriority:
-      // TODO: Handle LowSchedulerPriority, somehow. Maybe the same lane as hydration.
-      return DefaultLanePriority;
-    case IdleSchedulerPriority:
-      return IdleLanePriority;
-    default:
-      return NoLanePriority;
-  }
-}
-
 export function lanePriorityToSchedulerPriority(
   lanePriority: LanePriority,
 ): ReactPriorityLevel {

packages/react-reconciler/src/ReactFiberLane.old.js

@@ -42,7 +42,6 @@ import {
   ImmediatePriority as ImmediateSchedulerPriority,
   UserBlockingPriority as UserBlockingSchedulerPriority,
   NormalPriority as NormalSchedulerPriority,
-  LowPriority as LowSchedulerPriority,
   IdlePriority as IdleSchedulerPriority,
   NoPriority as NoSchedulerPriority,
 } from './SchedulerWithReactIntegration.old';
@@ -275,25 +274,6 @@ function getHighestPriorityLanes(lanes: Lanes | Lane): Lanes {
   }
 }
 
-export function schedulerPriorityToLanePriority(
-  schedulerPriorityLevel: ReactPriorityLevel,
-): LanePriority {
-  switch (schedulerPriorityLevel) {
-    case ImmediateSchedulerPriority:
-      return SyncLanePriority;
-    case UserBlockingSchedulerPriority:
-      return InputContinuousLanePriority;
-    case NormalSchedulerPriority:
-    case LowSchedulerPriority:
-      // TODO: Handle LowSchedulerPriority, somehow. Maybe the same lane as hydration.
-      return DefaultLanePriority;
-    case IdleSchedulerPriority:
-      return IdleLanePriority;
-    default:
-      return NoLanePriority;
-  }
-}
-
 export function lanePriorityToSchedulerPriority(
   lanePriority: LanePriority,
 ): ReactPriorityLevel {

packages/react-reconciler/src/ReactFiberWorkLoop.new.js

@@ -32,7 +32,6 @@ import {
   disableSchedulerTimeoutInWorkLoop,
   enableStrictEffects,
   skipUnmountedBoundaries,
-  enableNativeEventPriorityInference,
 } from 'shared/ReactFeatureFlags';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 import invariant from 'shared/invariant';
@@ -168,7 +167,6 @@ import {
   markRootExpired,
   markDiscreteUpdatesExpired,
   markRootFinished,
-  schedulerPriorityToLanePriority,
   lanePriorityToSchedulerPriority,
   higherLanePriority,
 } from './ReactFiberLane.new';
@@ -456,15 +454,8 @@ export function requestUpdateLane(fiber: Fiber): Lane {
     const currentLanePriority = getCurrentUpdateLanePriority();
     lane = findUpdateLane(currentLanePriority);
   } else {
-    if (enableNativeEventPriorityInference) {
-      const eventLanePriority = getCurrentEventPriority();
-      lane = findUpdateLane(eventLanePriority);
-    } else {
-      const schedulerLanePriority = schedulerPriorityToLanePriority(
-        schedulerPriority,
-      );
-      lane = findUpdateLane(schedulerLanePriority);
-    }
+    const eventLanePriority = getCurrentEventPriority();
+    lane = findUpdateLane(eventLanePriority);
   }
 
   return lane;

packages/react-reconciler/src/ReactFiberWorkLoop.old.js

@@ -32,7 +32,6 @@ import {
   disableSchedulerTimeoutInWorkLoop,
   enableStrictEffects,
   skipUnmountedBoundaries,
-  enableNativeEventPriorityInference,
 } from 'shared/ReactFeatureFlags';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
 import invariant from 'shared/invariant';
@@ -168,7 +167,6 @@ import {
   markRootExpired,
   markDiscreteUpdatesExpired,
   markRootFinished,
-  schedulerPriorityToLanePriority,
   lanePriorityToSchedulerPriority,
   higherLanePriority,
 } from './ReactFiberLane.old';
@@ -456,15 +454,8 @@ export function requestUpdateLane(fiber: Fiber): Lane {
     const currentLanePriority = getCurrentUpdateLanePriority();
     lane = findUpdateLane(currentLanePriority);
   } else {
-    if (enableNativeEventPriorityInference) {
-      const eventLanePriority = getCurrentEventPriority();
-      lane = findUpdateLane(eventLanePriority);
-    } else {
-      const schedulerLanePriority = schedulerPriorityToLanePriority(
-        schedulerPriority,
-      );
-      lane = findUpdateLane(schedulerLanePriority);
-    }
+    const eventLanePriority = getCurrentEventPriority();
+    lane = findUpdateLane(eventLanePriority);
   }
 
   return lane;