Re-land "Flush discrete passive effects before paint (#21150)" This re-lands commit 2e7aceeb5c8b6e5c61174c0e9731e263e956e445.

Re-land "Fix: flushSync changes priority inside effect (#21122)" This re-lands commit 0e3c7e1d62efb6238b69e5295d45b9bd2dcf9181.

Re-land "Delete LanePriority type (#21090)" This re-lands commit 26ddc63f2dcc8e7dcbacf498237a2bb1e28a7d23.

Re-land "Clean up host pointers in level 2 of clean-up flag (#21112)" This re-lands commit 8ed0c85bf174ce6e501be62d9ccec1889bbdbce1.

Re-land "Use highest priority lane to detect interruptions (#21088)"" This re-lands commit b4044f8a07323bcad7d55cbaedc35c35b4acf7e0.

Re-land "Support nesting of startTransition and flushSync (alt) (#21149)" This re-lands commit faa1e127f1ba755da846bc6ce299cdefaf97721f.

Revert "Use highest priority lane to detect interruptions (#21088)" This reverts commit b4044f8a07323bcad7d55cbaedc35c35b4acf7e0. Instead of LanePriority. I'm removing all uses of LanePriority so I can delete it.

Revert "Use highest priority lane to detect interruptions (#21088)" This reverts commit b4044f8a07323bcad7d55cbaedc35c35b4acf7e0. Instead of LanePriority. I'm removing all uses of LanePriority so I can delete it.

Revert "Use highest priority lane to detect interruptions (#21088)" This reverts commit b4044f8a07323bcad7d55cbaedc35c35b4acf7e0. Instead of LanePriority. I'm removing all uses of LanePriority so I can delete it.

Revert "Use highest priority lane to detect interruptions (#21088)" This reverts commit b4044f8a07323bcad7d55cbaedc35c35b4acf7e0. Instead of LanePriority. I'm removing all uses of LanePriority so I can delete it.

DevTools: Add post-commit hook (#21183) I recently added UI for the Profiler's commit and post-commit durations to the DevTools, but I made two pretty silly oversights: 1. I used the commit hook (called after mutation+layout effects) to read bo...

Revert expiration for retry lanes Retries should be allowed to expire if they are CPU bound for too long, but when I made this change it caused a spike in browser crashes. There must be some other underlying bug; not super urgent but ideally should fi...

DevTools: Add post-commit hook (#21183) I recently added UI for the Profiler's commit and post-commit durations to the DevTools, but I made two pretty silly oversights: 1. I used the commit hook (called after mutation+layout effects) to read bo...

DevTools: Add post-commit hook (#21183) I recently added UI for the Profiler's commit and post-commit durations to the DevTools, but I made two pretty silly oversights: 1. I used the commit hook (called after mutation+layout effects) to read bo...

Remove LanePriority from computeExpirationTime (#21087) I'm removing all uses of LanePriority so I can delete it.

Partial revert of "Entangled expired lanes with SyncLane (#21083)" This partially reverts #21083 while keeping the new behavior. It adds back the `root.expiredLanes` field, instead of using the `entanglements` array.

Entangled expired lanes with SyncLane (#21083) Makes the implementation simpler. Expiration is now a special case of entanglement. Also fixes an issue where expired lanes weren't batched with normal sync updates. (See deleted TODO comment in test.)

Remove LanePriority from getBumpedLaneForHydration (#21086) I'm removing all uses of LanePriority so I can delete it.

Partial revert of "Entangled expired lanes with SyncLane (#21083)" This partially reverts #21083 while keeping the new behavior. It adds back the `root.expiredLanes` field, instead of using the `entanglements` array.

Partial revert of "Entangled expired lanes with SyncLane (#21083)" This partially reverts #21083 while keeping the new behavior. It adds back the `root.expiredLanes` field, instead of using the `entanglements` array.

Bugfix: Don't rely on `finishedLanes` for passive effects (#21233) I recently started using `pendingPassiveEffectsLanes` to check if there were any pending passive effects (530027a). `pendingPassiveEffectsLanes` is the value of `root.finishedLanes` ...

Fix sloppy factoring when assigning finishedLanes `finishedLanes` is assigned in `performSyncWorkOnRoot` and `performSyncWorkOnRoot`. It's meant to represent whichever lanes we used to render, but because of some sloppy factoring, it can sometimes equ...

Remove redundant if statement (#21101)

Remove redundant setUpdatePriority call (#21127) See removed TODO comment. This call is no longer necessary because we use the dispatcher to track whether we're inside a transition, not the event priority.

Fix plurals (#21106)

Use highest priority lane to detect interruptions (#21088) Instead of LanePriority. I'm removing all uses of LanePriority so I can delete it.

Entangled expired lanes with SyncLane (#21083) Makes the implementation simpler. Expiration is now a special case of entanglement. Also fixes an issue where expired lanes weren't batched with normal sync updates. (See deleted TODO comment in test.)

Delete enableDiscreteEventFlushingChange (#21110) This flag was meant to avoid flushing discrete updates unnecessarily, if multiple discrete events were dispatched in response to the same platform event. But since we now flush all discrete events...

Remove LanePriority from computeExpirationTime (#21087) I'm removing all uses of LanePriority so I can delete it.

Delete enableDiscreteEventFlushingChange (#21110) This flag was meant to avoid flushing discrete updates unnecessarily, if multiple discrete events were dispatched in response to the same platform event. But since we now flush all discrete events...

Move not shared to client (#21135)

Remove redundant setUpdatePriority call (#21127) See removed TODO comment. This call is no longer necessary because we use the dispatcher to track whether we're inside a transition, not the event priority.

Move not shared to client (#21135)

React Fabric: Support passing nativeViewTag to getInspectorDataForViewAtPoint callback, for React DevTools compat (#21080) React Fabric: Support passing nativeViewTag to getInspectorDataForViewAtPoint callback, for React DevTools compat

[Fizz] Prepare Recursive Loop for More Types (#21186) * Split out into helper functions This is similar to the structure of beginWork in Fiber. * Split the rendering of a node from recursively rendering a node This lets us reuse render node a...

Use Lane to track root callback priority (#21089) Instead of LanePriority. I'm removing all uses of LanePriority so I can delete it.

Support nesting of startTransition and flushSync (alt) (#21149) * Support nesting of startTransition and flushSync * Unset transition before entering any special execution contexts Co-authored-by: Andrew Clark <git@andrewclark.io>

Clean up host pointers in level 2 of clean-up flag (#21112) The host tree is a cyclical structure. Leaking a single DOM node can retain a large amount of memory. React-managed DOM nodes also point back to a fiber tree. Perf testing suggests that ...

Support nesting of startTransition and flushSync (alt) (#21149) * Support nesting of startTransition and flushSync * Unset transition before entering any special execution contexts Co-authored-by: Andrew Clark <git@andrewclark.io>

Bugfix: Don't rely on `finishedLanes` for passive effects (#21233) I recently started using `pendingPassiveEffectsLanes` to check if there were any pending passive effects (530027a). `pendingPassiveEffectsLanes` is the value of `root.finishedLanes` ...

Bugfix: Don't rely on `finishedLanes` for passive effects (#21233) I recently started using `pendingPassiveEffectsLanes` to check if there were any pending passive effects (530027a). `pendingPassiveEffectsLanes` is the value of `root.finishedLanes` ...

Use EventPriority to track update priority (#21082) Instead of LanePriority. Internally, EventPriority is just a lane, so this skips an extra conversion. Since EventPriority is a "public" (to the host config) type, I was also able to remove some deep ...

Remove pendingPassiveEffectsRenderPriority

Passive effect updates are always default pri

Passive effect updates are idle if render was idle

Remove pendingPassiveEffectsRenderPriority

Remove pendingPassiveEffectsRenderPriority

Remove redundant typecheck

Remove dead argument renderPriorityLevel

Passive effects priority is always default or idle

DevTools: Add post-commit hook (#21183) I recently added UI for the Profiler's commit and post-commit durations to the DevTools, but I made two pretty silly oversights: 1. I used the commit hook (called after mutation+layout effects) to read bo...

Use highest priority lane to detect interruptions (#21088) Instead of LanePriority. I'm removing all uses of LanePriority so I can delete it.

Remove LanePriority from computeExpirationTime (#21087) I'm removing all uses of LanePriority so I can delete it.

Remove LanePriority from getBumpedLaneForHydration (#21086) I'm removing all uses of LanePriority so I can delete it.

Entangled expired lanes with SyncLane (#21083) Makes the implementation simpler. Expiration is now a special case of entanglement. Also fixes an issue where expired lanes weren't batched with normal sync updates. (See deleted TODO comment in test.)

DevTools: Add post-commit hook (#21183) I recently added UI for the Profiler's commit and post-commit durations to the DevTools, but I made two pretty silly oversights: 1. I used the commit hook (called after mutation+layout effects) to read bo...

Use highest priority lane to detect interruptions (#21088) Instead of LanePriority. I'm removing all uses of LanePriority so I can delete it.

Move sync task queue to its own module (#21109) The sync task queue is React-specific and doesn't really have anything to do with Scheduler. We'd keep using it even once `postTask` exists. By separating that part out, `SchedulerWithReactIntegratio...

Use EventPriority to track update priority (#21082) Instead of LanePriority. Internally, EventPriority is just a lane, so this skips an extra conversion. Since EventPriority is a "public" (to the host config) type, I was also able to remove some deep ...

DevTools: Add post-commit hook (#21183) I recently added UI for the Profiler's commit and post-commit durations to the DevTools, but I made two pretty silly oversights: 1. I used the commit hook (called after mutation+layout effects) to read bo...

Fix: Passive effect updates are never sync I screwed this up in #21082. Got confused by the < versus > thing again. The helper functions are annoying, too, because I always forget the intended order of the arguments. But they're still helpful because...

[WIP] Debug hydration error

[WIP] Debug hydration error