From c4cdb73a737f303feae14be5dbd415cd5a45c54f Mon Sep 17 00:00:00 2001
From: Andrew Clark <git@andrewclark.io>
Date: Fri, 16 Oct 2020 10:35:06 -0500
Subject: [PATCH] Remove last schedulePassiveEffectCallback call

Now there's only a single place where the passive effect callback
is scheduled.
---
 .../src/ReactFiberCommitWork.new.js           |  6 --
 .../src/ReactFiberWorkLoop.new.js             | 56 ++++++-------------
 2 files changed, 18 insertions(+), 44 deletions(-)

diff --git a/packages/react-reconciler/src/ReactFiberCommitWork.new.js b/packages/react-reconciler/src/ReactFiberCommitWork.new.js
index c43c6f8b1363fb..687e62de976c71 100644
--- a/packages/react-reconciler/src/ReactFiberCommitWork.new.js
+++ b/packages/react-reconciler/src/ReactFiberCommitWork.new.js
@@ -70,7 +70,6 @@ import {
   Update,
   Callback,
   LayoutMask,
-  PassiveMask,
   Ref,
 } from './ReactFiberFlags';
 import getComponentName from 'shared/getComponentName';
@@ -125,7 +124,6 @@ import {
   captureCommitPhaseError,
   resolveRetryWakeable,
   markCommitTimeOfFallback,
-  schedulePassiveEffectCallback,
 } from './ReactFiberWorkLoop.new';
 import {
   NoFlags as NoHookEffect,
@@ -599,10 +597,6 @@ function recursivelyCommitLayoutEffects(
                 finishedWork,
               );
             }
-
-            if ((finishedWork.subtreeFlags & PassiveMask) !== NoFlags) {
-              schedulePassiveEffectCallback();
-            }
             break;
           }
           case ClassComponent: {
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
index ff171af0c53565..53a6b0334d8ebb 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
@@ -341,7 +341,6 @@ let hasUncaughtError = false;
 let firstUncaughtError = null;
 let legacyErrorBoundariesThatAlreadyFailed: Set<mixed> | null = null;
 
-let rootDoesHavePassiveEffects: boolean = false;
 let rootWithPendingPassiveEffects: FiberRoot | null = null;
 let pendingPassiveEffectsRenderPriority: ReactPriorityLevel = NoSchedulerPriority;
 let pendingPassiveEffectsLanes: Lanes = NoLanes;
@@ -1865,6 +1864,22 @@ function commitRootImpl(root, renderPriorityLevel) {
     // times out.
   }
 
+  // If there are pending passive effects, schedule a callback to process them.
+  // Do this as early as possible, before anything else in the commit phase
+  // is scheduled.
+  const rootDoesHavePassiveEffects =
+    (finishedWork.subtreeFlags & PassiveMask) !== NoFlags ||
+    (finishedWork.flags & PassiveMask) !== NoFlags;
+  if (rootDoesHavePassiveEffects) {
+    rootWithPendingPassiveEffects = root;
+    pendingPassiveEffectsLanes = lanes;
+    pendingPassiveEffectsRenderPriority = renderPriorityLevel;
+    scheduleCallback(NormalSchedulerPriority, () => {
+      flushPassiveEffects();
+      return null;
+    });
+  }
+
   // Check if there are any effects in the whole tree.
   // TODO: This is left over from the effect list implementation, where we had
   // to check for the existence of `firstEffect` to satsify Flow. I think the
@@ -1880,20 +1895,6 @@ function commitRootImpl(root, renderPriorityLevel) {
     NoFlags;
 
   if (subtreeHasEffects || rootHasEffect) {
-    // If there are pending passive effects, schedule a callback to process them.
-    if (
-      (finishedWork.subtreeFlags & PassiveMask) !== NoFlags ||
-      (finishedWork.flags & PassiveMask) !== NoFlags
-    ) {
-      if (!rootDoesHavePassiveEffects) {
-        rootDoesHavePassiveEffects = true;
-        scheduleCallback(NormalSchedulerPriority, () => {
-          flushPassiveEffects();
-          return null;
-        });
-      }
-    }
-
     let previousLanePriority;
     if (decoupleUpdatePriorityFromScheduler) {
       previousLanePriority = getCurrentUpdateLanePriority();
@@ -2010,17 +2011,6 @@ function commitRootImpl(root, renderPriorityLevel) {
     }
   }
 
-  const rootDidHavePassiveEffects = rootDoesHavePassiveEffects;
-
-  if (rootDoesHavePassiveEffects) {
-    // This commit has passive effects. Stash a reference to them. But don't
-    // schedule a callback until after flushing layout work.
-    rootDoesHavePassiveEffects = false;
-    rootWithPendingPassiveEffects = root;
-    pendingPassiveEffectsLanes = lanes;
-    pendingPassiveEffectsRenderPriority = renderPriorityLevel;
-  }
-
   // Read this again, since an effect might have updated it
   remainingLanes = root.pendingLanes;
 
@@ -2047,13 +2037,13 @@ function commitRootImpl(root, renderPriorityLevel) {
   }
 
   if (__DEV__ && enableDoubleInvokingEffects) {
-    if (!rootDidHavePassiveEffects) {
+    if (!rootDoesHavePassiveEffects) {
       commitDoubleInvokeEffectsInDEV(root.current, false);
     }
   }
 
   if (enableSchedulerTracing) {
-    if (!rootDidHavePassiveEffects) {
+    if (!rootDoesHavePassiveEffects) {
       // If there are no passive effects, then we can complete the pending interactions.
       // Otherwise, we'll wait until after the passive effects are flushed.
       // Wait to do this until after remaining work has been scheduled,
@@ -2356,16 +2346,6 @@ function commitMutationEffectsDeletions(
   }
 }
 
-export function schedulePassiveEffectCallback() {
-  if (!rootDoesHavePassiveEffects) {
-    rootDoesHavePassiveEffects = true;
-    scheduleCallback(NormalSchedulerPriority, () => {
-      flushPassiveEffects();
-      return null;
-    });
-  }
-}
-
 export function flushPassiveEffects(): boolean {
   // Returns whether passive effects were flushed.
   if (pendingPassiveEffectsRenderPriority !== NoSchedulerPriority) {