Use Lane to track root callback priority (#21089)

acdlite · web-flow · commit dcd13045ef5d · 2021-03-28T13:58:46.000-07:00
Instead of LanePriority.

I'm removing all uses of LanePriority so I can delete it.
diff --git a/packages/react-reconciler/src/ReactFiberLane.new.js b/packages/react-reconciler/src/ReactFiberLane.new.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import type {FiberRoot, ReactPriorityLevel} from './ReactInternalTypes';
+import type {FiberRoot} from './ReactInternalTypes';
 
 // TODO: Ideally these types would be opaque but that doesn't work well with
 // our reconciler fork infra, since these leak into non-reconciler packages.
@@ -35,17 +35,8 @@ export type Lanes = number;
 export type Lane = number;
 export type LaneMap<T> = Array<T>;
 
-import invariant from 'shared/invariant';
 import {enableCache, enableSchedulingProfiler} from 'shared/ReactFeatureFlags';
 
-import {
-  ImmediatePriority as ImmediateSchedulerPriority,
-  UserBlockingPriority as UserBlockingSchedulerPriority,
-  NormalPriority as NormalSchedulerPriority,
-  IdlePriority as IdleSchedulerPriority,
-  NoPriority as NoSchedulerPriority,
-} from './SchedulerWithReactIntegration.new';
-
 export const SyncLanePriority: LanePriority = 12;
 
 const InputContinuousHydrationLanePriority: LanePriority = 11;
@@ -244,37 +235,6 @@ function getHighestPriorityLanes(lanes: Lanes | Lane): Lanes {
   }
 }
 
-export function lanePriorityToSchedulerPriority(
-  lanePriority: LanePriority,
-): ReactPriorityLevel {
-  switch (lanePriority) {
-    case SyncLanePriority:
-      return ImmediateSchedulerPriority;
-    case InputContinuousHydrationLanePriority:
-    case InputContinuousLanePriority:
-      return UserBlockingSchedulerPriority;
-    case DefaultHydrationLanePriority:
-    case DefaultLanePriority:
-    case TransitionHydrationPriority:
-    case TransitionPriority:
-    case SelectiveHydrationLanePriority:
-    case RetryLanePriority:
-      return NormalSchedulerPriority;
-    case IdleHydrationLanePriority:
-    case IdleLanePriority:
-    case OffscreenLanePriority:
-      return IdleSchedulerPriority;
-    case NoLanePriority:
-      return NoSchedulerPriority;
-    default:
-      invariant(
-        false,
-        'Invalid update priority: %s. This is a bug in React.',
-        lanePriority,
-      );
-  }
-}
-
 export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
   // Early bailout if there's no pending work left.
   const pendingLanes = root.pendingLanes;
diff --git a/packages/react-reconciler/src/ReactFiberLane.old.js b/packages/react-reconciler/src/ReactFiberLane.old.js
@@ -7,7 +7,7 @@
  * @flow
  */
 
-import type {FiberRoot, ReactPriorityLevel} from './ReactInternalTypes';
+import type {FiberRoot} from './ReactInternalTypes';
 
 // TODO: Ideally these types would be opaque but that doesn't work well with
 // our reconciler fork infra, since these leak into non-reconciler packages.
@@ -35,17 +35,8 @@ export type Lanes = number;
 export type Lane = number;
 export type LaneMap<T> = Array<T>;
 
-import invariant from 'shared/invariant';
 import {enableCache, enableSchedulingProfiler} from 'shared/ReactFeatureFlags';
 
-import {
-  ImmediatePriority as ImmediateSchedulerPriority,
-  UserBlockingPriority as UserBlockingSchedulerPriority,
-  NormalPriority as NormalSchedulerPriority,
-  IdlePriority as IdleSchedulerPriority,
-  NoPriority as NoSchedulerPriority,
-} from './SchedulerWithReactIntegration.old';
-
 export const SyncLanePriority: LanePriority = 12;
 
 const InputContinuousHydrationLanePriority: LanePriority = 11;
@@ -244,37 +235,6 @@ function getHighestPriorityLanes(lanes: Lanes | Lane): Lanes {
   }
 }
 
-export function lanePriorityToSchedulerPriority(
-  lanePriority: LanePriority,
-): ReactPriorityLevel {
-  switch (lanePriority) {
-    case SyncLanePriority:
-      return ImmediateSchedulerPriority;
-    case InputContinuousHydrationLanePriority:
-    case InputContinuousLanePriority:
-      return UserBlockingSchedulerPriority;
-    case DefaultHydrationLanePriority:
-    case DefaultLanePriority:
-    case TransitionHydrationPriority:
-    case TransitionPriority:
-    case SelectiveHydrationLanePriority:
-    case RetryLanePriority:
-      return NormalSchedulerPriority;
-    case IdleHydrationLanePriority:
-    case IdleLanePriority:
-    case OffscreenLanePriority:
-      return IdleSchedulerPriority;
-    case NoLanePriority:
-      return NoSchedulerPriority;
-    default:
-      invariant(
-        false,
-        'Invalid update priority: %s. This is a bug in React.',
-        lanePriority,
-      );
-  }
-}
-
 export function getNextLanes(root: FiberRoot, wipLanes: Lanes): Lanes {
   // Early bailout if there's no pending work left.
   const pendingLanes = root.pendingLanes;
diff --git a/packages/react-reconciler/src/ReactFiberRoot.new.js b/packages/react-reconciler/src/ReactFiberRoot.new.js
@@ -13,8 +13,8 @@ import type {RootTag} from './ReactRootTags';
 import {noTimeout, supportsHydration} from './ReactFiberHostConfig';
 import {createHostRootFiber} from './ReactFiber.new';
 import {
+  NoLane,
   NoLanes,
-  NoLanePriority,
   NoTimestamp,
   createLaneMap,
 } from './ReactFiberLane.new';
@@ -41,7 +41,7 @@ function FiberRootNode(containerInfo, tag, hydrate) {
   this.pendingContext = null;
   this.hydrate = hydrate;
   this.callbackNode = null;
-  this.callbackPriority = NoLanePriority;
+  this.callbackPriority = NoLane;
   this.eventTimes = createLaneMap(NoLanes);
   this.expirationTimes = createLaneMap(NoTimestamp);
 
diff --git a/packages/react-reconciler/src/ReactFiberRoot.old.js b/packages/react-reconciler/src/ReactFiberRoot.old.js
@@ -13,8 +13,8 @@ import type {RootTag} from './ReactRootTags';
 import {noTimeout, supportsHydration} from './ReactFiberHostConfig';
 import {createHostRootFiber} from './ReactFiber.old';
 import {
+  NoLane,
   NoLanes,
-  NoLanePriority,
   NoTimestamp,
   createLaneMap,
 } from './ReactFiberLane.old';
@@ -41,7 +41,7 @@ function FiberRootNode(containerInfo, tag, hydrate) {
   this.pendingContext = null;
   this.hydrate = hydrate;
   this.callbackNode = null;
-  this.callbackPriority = NoLanePriority;
+  this.callbackPriority = NoLane;
   this.eventTimes = createLaneMap(NoLanes);
   this.expirationTimes = createLaneMap(NoTimestamp);
 
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
@@ -43,7 +43,9 @@ import {
   requestPaint,
   now,
   ImmediatePriority as ImmediateSchedulerPriority,
+  UserBlockingPriority as UserBlockingSchedulerPriority,
   NormalPriority as NormalSchedulerPriority,
+  IdlePriority as IdleSchedulerPriority,
   flushSyncCallbackQueue,
   scheduleSyncCallback,
 } from './SchedulerWithReactIntegration.new';
@@ -130,8 +132,6 @@ import {
   MountLayoutDev,
 } from './ReactFiberFlags';
 import {
-  NoLanePriority,
-  SyncLanePriority,
   NoLanes,
   NoLane,
   SyncLane,
@@ -147,7 +147,6 @@ import {
   includesOnlyRetries,
   includesOnlyTransitions,
   getNextLanes,
-  returnNextLanesPriority,
   markStarvedLanesAsExpired,
   getLanesToRetrySynchronouslyOnError,
   getMostRecentEventTime,
@@ -156,12 +155,14 @@ import {
   markRootPinged,
   markRootExpired,
   markRootFinished,
-  lanePriorityToSchedulerPriority,
   areLanesExpired,
+  getHighestPriorityLane,
 } from './ReactFiberLane.new';
 import {
   DiscreteEventPriority,
+  ContinuousEventPriority,
   DefaultEventPriority,
+  IdleEventPriority,
   getCurrentUpdatePriority,
   setCurrentUpdatePriority,
   higherEventPriority,
@@ -653,19 +654,20 @@ function ensureRootIsScheduled(root: FiberRoot, currentTime: number) {
     root,
     root === workInProgressRoot ? workInProgressRootRenderLanes : NoLanes,
   );
-  // This returns the priority level computed during the `getNextLanes` call.
-  const newCallbackPriority = returnNextLanesPriority();
 
   if (nextLanes === NoLanes) {
     // Special case: There's nothing to work on.
     if (existingCallbackNode !== null) {
       cancelCallback(existingCallbackNode);
     }
     root.callbackNode = null;
-    root.callbackPriority = NoLanePriority;
+    root.callbackPriority = NoLane;
     return;
   }
 
+  // We use the highest priority lane to represent the priority of the callback.
+  const newCallbackPriority = getHighestPriorityLane(nextLanes);
+
   // Check if there's an existing task. We may be able to reuse it.
   const existingCallbackPriority = root.callbackPriority;
   if (existingCallbackPriority === newCallbackPriority) {
@@ -675,7 +677,7 @@ function ensureRootIsScheduled(root: FiberRoot, currentTime: number) {
       // TODO: Temporary until we confirm this warning is not fired.
       if (
         existingCallbackNode == null &&
-        existingCallbackPriority !== SyncLanePriority
+        existingCallbackPriority !== SyncLane
       ) {
         console.error(
           'Expected scheduled callback to exist. This error is likely caused by a bug in React. Please file an issue.',
@@ -693,7 +695,7 @@ function ensureRootIsScheduled(root: FiberRoot, currentTime: number) {
 
   // Schedule a new callback.
   let newCallbackNode;
-  if (newCallbackPriority === SyncLanePriority) {
+  if (newCallbackPriority === SyncLane) {
     // Special case: Sync React callbacks are scheduled on a special
     // internal queue
     scheduleSyncCallback(performSyncWorkOnRoot.bind(null, root));
@@ -706,9 +708,24 @@ function ensureRootIsScheduled(root: FiberRoot, currentTime: number) {
     }
     newCallbackNode = null;
   } else {
-    const schedulerPriorityLevel = lanePriorityToSchedulerPriority(
-      newCallbackPriority,
-    );
+    let schedulerPriorityLevel;
+    switch (lanesToEventPriority(nextLanes)) {
+      case DiscreteEventPriority:
+        schedulerPriorityLevel = ImmediateSchedulerPriority;
+        break;
+      case ContinuousEventPriority:
+        schedulerPriorityLevel = UserBlockingSchedulerPriority;
+        break;
+      case DefaultEventPriority:
+        schedulerPriorityLevel = NormalSchedulerPriority;
+        break;
+      case IdleEventPriority:
+        schedulerPriorityLevel = IdleSchedulerPriority;
+        break;
+      default:
+        schedulerPriorityLevel = NormalSchedulerPriority;
+        break;
+    }
     newCallbackNode = scheduleCallback(
       schedulerPriorityLevel,
       performConcurrentWorkOnRoot.bind(null, root),
@@ -1744,7 +1761,7 @@ function commitRootImpl(root, renderPriorityLevel) {
   // commitRoot never returns a continuation; it always finishes synchronously.
   // So we can clear these now to allow a new callback to be scheduled.
   root.callbackNode = null;
-  root.callbackPriority = NoLanePriority;
+  root.callbackPriority = NoLane;
 
   // Update the first and last pending times on this root. The new first
   // pending time is whatever is left on the root fiber.
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.old.js b/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
diff --git a/packages/react-reconciler/src/ReactInternalTypes.js b/packages/react-reconciler/src/ReactInternalTypes.js
