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Native Animated - Coalesce onValueChanged events on iOS #15682

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janicduplessis
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@janicduplessis janicduplessis commented Aug 28, 2017

Summary

While playing around with the event code I figured we could leverage RCTEvent to easily coalesce onValueChanged events for Native Animated. I meant to do that for a while but didn't knew about a simple solution. This makes it so if JS lags behind we won't spam a bunch on onValueChanged events after.

Test plan

Tested this fix by logging the number of listener calls every 16ms and make sure it is never more than one when running an animation with a listener in RNTester native animated example. Before the fix when adding some lag to JS the listener would get called 7-8 times after the JS lag ended and after this fix only once.

Changelog

[iOS] [Changed] - Native Animated - Coalesce onValueChanged events on iOS

@facebook-github-bot facebook-github-bot added CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. GH Review: review-needed labels Aug 28, 2017
{
if ((self = [super init])) {
_eventName = @"onAnimatedValueUpdate";
_viewTag = nodeTag;
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RCTEvent protocol is a bit specific to views events but the coalescing logic can be used for any kind of event. Ideally this would not be called viewTag but for now we use this to coalesce events by node tag. It would have also been possible to use coalescingKey instead.

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How can we make it less specific or simply better? Let's do this. 😄

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@facebook-github-bot label Core Team

Attention: @janicduplessis

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Seems like we can deprecated RCTEventEmitter, right? 😄


@interface RCTAnimatedValueChangeEvent : NSObject <RCTEvent>

- (instancetype)initWithNodeTag:(NSNumber *)nodeTag
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If it is not a viewTag, should we don't implement viewTag property at all and mark viewTag as optional in the protocol.

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@janicduplessis janicduplessis Aug 30, 2017

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This should be possible, we only use viewTag to generate an id for the event based on viewTag + eventName + coalescingKey. We could make view tag optional for events that are not related to views and only use coalescingKey to identify these events. (https://github.com/facebook/react-native/blob/master/React/Base/RCTEventDispatcher.m#L34)

Libraries/NativeAnimation/RCTAnimatedValueChangeEvent.m Outdated Show resolved Hide resolved
CGFloat _value;
}

@synthesize viewTag = _viewTag;
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Why do not declare this as regular @-properties?

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Same as the _bridge for native modules, it implements properties from the RCTEvent protocol. Based this on other events (https://github.com/facebook/react-native/blob/master/React/Views/RCTScrollView.m#L51)

@@ -22,6 +27,8 @@ @implementation RCTNativeAnimatedModule
NSMutableArray<AnimatedOperation> *_preOperations;
}

@synthesize bridge = _bridge;
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Just serious, is this a special reason to use syntesize here? Why should not use just a ivar?

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Or why don't add this as a prop to class interface inside this (.m) file?
To me, @syntesize always looks like or something redundant/old-fasioned or something very specific.

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From what I understand @synthesize is used to implement properties from a protocol without having to redefine them (https://github.com/facebook/react-native/blob/master/React/Base/RCTBridgeModule.h#L87). It's pretty much used for every native module that needs to access the bridge.

{
if ((self = [super init])) {
_eventName = @"onAnimatedValueUpdate";
_viewTag = nodeTag;
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How can we make it less specific or simply better? Let's do this. 😄

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shergin commented Aug 29, 2017

Looks awesome, actually.

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@janicduplessis do you have any updates for this pull request? It's been a while since the last update so wanted to check in and see if you've looked at the requested changes.

@react-native-bot react-native-bot added Missing Changelog This PR appears to be missing a changelog, or they are incorrectly formatted. Ran Commands One of our bots successfully processed a command. Animated labels Mar 16, 2018
@react-native-bot react-native-bot added API: Animated Ran Commands One of our bots successfully processed a command. labels Mar 18, 2018
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hramos commented Aug 20, 2018

Sorry it's taken so long - do you still want to get this in?

@hramos hramos added ✅Changelog and removed Missing Changelog This PR appears to be missing a changelog, or they are incorrectly formatted. labels Jan 15, 2019
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hramos commented Jan 15, 2019

Should we continue working on this PR?

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cpojer commented Jan 28, 2019

Hey @janicduplessis, just asking again whether we still want to do this? If you aren't interested in moving further on this PR I think we should close it soon. Let us know!

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I think we can still land this, gonna address comments by @shergin when I get some time.

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Going to close this for now, if anyone has time feel free to pick this up.

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hramos commented Feb 14, 2019

It looks like this PR was blocked on getting #15894 merged. #15894 just got approved, let us know if you want to revive this one.

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This PR is actually pretty land-able, I'll have some time to work on it soon.

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pull-bot commented Apr 22, 2019

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📖 📋 Missing Summary - Can you add a Summary? To do so, add a "## Summary" section to your PR description. This is a good place to explain the motivation for making this change.
📖 📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.
📖

📋 Missing Changelog - Can you add a Changelog? To do so, add a "## Changelog" section to your PR description. A changelog entry has the following format: [CATEGORY] [TYPE] - Message.

CATEGORY may be:
  • General
  • iOS
  • Android

TYPE may be:

  • Added, for new features.
  • Changed, for changes in existing functionality.
  • Deprecated, for soon-to-be removed features.
  • Removed, for now removed features.
  • Fixed, for any bug fixes.
  • Security, in case of vulnerabilities.

MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.

Generated by 🚫 dangerJS against e78de2c

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cpojer commented Jun 4, 2019

Ping?

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cpojer commented Jun 21, 2019

@janicduplessis any chance you could do a pass on this PR so we can finally get it in? :)

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Messages
📖 📋 Missing Summary - Can you add a Summary? To do so, add a "## Summary" section to your PR description. This is a good place to explain the motivation for making this change.
📖 📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.
📖

📋 Missing Changelog - Can you add a Changelog? To do so, add a "## Changelog" section to your PR description. A changelog entry has the following format: [CATEGORY] [TYPE] - Message.

CATEGORY may be:
  • General
  • iOS
  • Android
  • JavaScript
  • Internal (for changes that do not need to be called out in the release notes)

TYPE may be:

  • Added, for new features.
  • Changed, for changes in existing functionality.
  • Deprecated, for soon-to-be removed features.
  • Removed, for now removed features.
  • Fixed, for any bug fixes.
  • Security, in case of vulnerabilities.

MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.

Generated by 🚫 dangerJS against acc3318

@janicduplessis
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@cpojer But I like having the oldest PR in the repo

Actually I still do after this lands 😄

Rebased and tested again, surprisingly this still works 2 years later.

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cpojer commented Jun 28, 2019

As discussed on Discord, we need to make sure that this is backwards compatible over the JS<->native boundary.

facebook-github-bot pushed a commit that referenced this pull request Jul 30, 2019
Summary:
This sync includes the following changes:
- **[55bc393f7](https://github.com/facebook/react/^Cmmit/55bc393f7 )**: [Flare] Ensure we check for bad polyfill when creating responders (#16243) //<Dominic Gannaway>//
- **[47656bf2a](https://github.com/facebook/react/^Cmmit/47656bf2a )**: [Flare] Remove longpress from press responder (#16242) //<Nicolas Gallagher>//
- **[9914a1919](https://github.com/facebook/react/^Cmmit/9914a1919 )**: [Fresh] Transfer refs when remounting (#16241) //<Dan Abramov>//
- **[75ab53b9e](https://github.com/facebook/react/^Cmmit/75ab53b9e )**: [scheduler] Yield many times per frame, no rAF (#16214) //<Andrew Clark>//
- **[0d7141dd4](https://github.com/facebook/react/^Cmmit/0d7141dd4 )**: [Flare] Fix SSR issue with serializing responders prop (#16227) //<Dominic Gannaway>//
- **[ed57bf8ed](https://github.com/facebook/react/^Cmmit/ed57bf8ed )**: [Bugfix] Check tag before calling hook effects (#16215) //<Andrew Clark>//
- **[858c84206](https://github.com/facebook/react/^Cmmit/858c84206 )**: Don't hyphenate custom CSS properties for ReactDOMServer (#16167) //<Belmin Bedak>//
- **[d412eec83](https://github.com/facebook/react/^Cmmit/d412eec83 )**: [act] flush work correctly without a mocked scheduler (#16223) //<Sunil Pai>//
- **[b43785e15](https://github.com/facebook/react/^Cmmit/b43785e15 )**: Update use-subscription README (#16216) //<Sophie Alpert>//
- **[c0830a0e6](https://github.com/facebook/react/^Cmmit/c0830a0e6 )**: [Scheduler] Test browser implementation details (#16198) //<Andrew Clark>//
- **[857deb2ed](https://github.com/facebook/react/^Cmmit/857deb2ed )**: Warn when Using DefaultProps on Function Components (#16210) //<lunaruan>//
- **[e0472709c](https://github.com/facebook/react/^Cmmit/e0472709c )**: [Flare] Adds Keyboard event responder (#16204) //<Dominic Gannaway>//
- **[5b08f7b43](https://github.com/facebook/react/^Cmmit/5b08f7b43 )**: [Flare] Adds useListener implementation to ReactDebugHooks (#16205) //<Dominic Gannaway>//
- **[ed72f4025](https://github.com/facebook/react/^Cmmit/ed72f4025 )**: [Flare] Remove references to EventComponent (#16206) //<Dominic Gannaway>//
- **[121bfb03b](https://github.com/facebook/react/^Cmmit/121bfb03b )**: update legacy context warning message (#16196) //<Sunil Pai>//
- **[9ae5e38f1](https://github.com/facebook/react/^Cmmit/9ae5e38f1 )**: Add guard to ensure Profiler onRender prop is function before calling (#16197) //<Brian Vaughn>//
- **[144dba1a1](https://github.com/facebook/react/^Cmmit/144dba1a1 )**: Fix suspenseCallback type warning, add a test (#16194) //<Benoit Girard>//
- **[7ad221126](https://github.com/facebook/react/^Cmmit/7ad221126 )**: [Flare] Ensure Flare components are no-ops for TestRenderer (#16192) //<Dominic Gannaway>//
- **[06cc99699](https://github.com/facebook/react/^Cmmit/06cc99699 )**: Edit Suspense Priority Warning Message (#16186) //<lunaruan>//
- **[42b75ab00](https://github.com/facebook/react/^Cmmit/42b75ab00 )**: Add suspenseCallback feature for runtime tracing of loading states (#16134) //<Benoit Girard>//
- **[c73e1f236](https://github.com/facebook/react/^Cmmit/c73e1f236 )**: flush work on exiting outermost act(), with nested act()s from different renderers (#16181) //<Sunil Pai>//
- **[509889119](https://github.com/facebook/react/^Cmmit/509889119 )**: [Flare] Redesign core event system (#16163) //<Dominic Gannaway>//
- **[19354db51](https://github.com/facebook/react/^Cmmit/19354db51 )**: [Scheduler] Add names to inline functions (#16180) //<Andrew Clark>//
- **[bff7abf6b](https://github.com/facebook/react/^Cmmit/bff7abf6b )**: [Scheduler][Bugfix] Multiple rAFs in same frame (#16184) //<Andrew Clark>//
- **[afb599168](https://github.com/facebook/react/^Cmmit/afb599168 )**: Enable profiler+tracing for test renderer (#16178) //<Brian Vaughn>//
- **[2237efcef](https://github.com/facebook/react/^Cmmit/2237efcef )**: [Fresh] Track unrecoverable errors (#16183) //<Dan Abramov>//
- **[bbd21066e](https://github.com/facebook/react/^Cmmit/bbd21066e )**: [Flare] Press: fix keyboard interactions (#16179) //<Nicolas Gallagher>//
- **[03944bfb0](https://github.com/facebook/react/^Cmmit/03944bfb0 )**: Update Suspense Priority Warning to Include Component that Triggered Update (#16030) //<lunaruan>//
- **[3f2cafe8b](https://github.com/facebook/react/^Cmmit/3f2cafe8b )**: [WIP][Scheduler] Use rIC to post first callback (#16166) //<Andrew Clark>//
- **[2bd88e38a](https://github.com/facebook/react/^Cmmit/2bd88e38a )**: [Scheduler] Bugfix: Cancelling a continuation (#16151) //<Andrew Clark>//
- **[783b8f4ae](https://github.com/facebook/react/^Cmmit/783b8f4ae )**: [Flare] Ensure mouse events can use target to validate press (#16172) //<Dominic Gannaway>//
- **[2c4d61e10](https://github.com/facebook/react/^Cmmit/2c4d61e10 )**: Adds experimental fundamental interface (#16049) //<Dominic Gannaway>//
- **[b4178af81](https://github.com/facebook/react/^Cmmit/b4178af81 )**: clean up nextEffect pointers (#16115) //<Paul Shen>//
- **[997154bcc](https://github.com/facebook/react/^Cmmit/997154bcc )**: [Flare] Add FocusWithin responder (#16152) //<Nicolas Gallagher>//
- **[65b80fdd9](https://github.com/facebook/react/^Cmmit/65b80fdd9 )**: [Flare] Add Input event responder surface (#16148) //<Dominic Gannaway>//
- **[ce883a19d](https://github.com/facebook/react/^Cmmit/ce883a19d )**: useSubscription hook (#15022) //<Brian Vaughn>//
- **[c45c2c3a2](https://github.com/facebook/react/^Cmmit/c45c2c3a2 )**: Move ReactFiberErrorDialog RN fork into RN itself (#16141) //<Moti Zilberman>//
- **[d9b4c55d5](https://github.com/facebook/react/^Cmmit/d9b4c55d5 )**: unify deprecated/unsafe lifecycle warnings, pass tests (#16103) //<Sunil Pai>//
- **[424099da6](https://github.com/facebook/react/^Cmmit/424099da6 )**: Inject getCurrentFiber() function to DevTools (#16133) //<Brian Vaughn>//
- **[9f395904c](https://github.com/facebook/react/^Cmmit/9f395904c )**: Inject ReactDebugCurrentFrame into DevTools so it can append component stacks to warnings in DEV mode (#16127) //<Brian Vaughn>//
- **[fcff9c57b](https://github.com/facebook/react/^Cmmit/fcff9c57b )**: Add tail="hidden" option to SuspenseList (#16024) //<Sebastian Markbåge>//
- **[8d413bf2c](https://github.com/facebook/react/^Cmmit/8d413bf2c )**: Remove React.error and React.warn (#16126) //<Brian Vaughn>//
- **[ca4d78f9b](https://github.com/facebook/react/^Cmmit/ca4d78f9b )**: [Flare] Press: fix middle-click handling (#16114) //<Nicolas Gallagher>//
- **[3f1dee09a](https://github.com/facebook/react/^Cmmit/3f1dee09a )**: expose act() sigil correctly for umd builds (#16110) //<Sunil Pai>//
- **[b7669044d](https://github.com/facebook/react/^Cmmit/b7669044d )**: Use Map instead of object as map in ReactNativeComponentTree (#16107) //<Sebastian Markbåge>//
- **[d2d9b1f70](https://github.com/facebook/react/^Cmmit/d2d9b1f70 )**: [Scheduler] Support inferring priority from stack (#16105) //<Andrew Clark>//
- **[48f659447](https://github.com/facebook/react/^Cmmit/48f659447 )**: Add warning when single item or nested arrays are used with SuspenseList (#16094) //<Sebastian Markbåge>//
- **[2073a7144](https://github.com/facebook/react/^Cmmit/2073a7144 )**: [Flare] Press includes button type (#16100) //<Nicolas Gallagher>//
- **[23b8a2534](https://github.com/facebook/react/^Cmmit/23b8a2534 )**: [Flare] Remove responder flags to simplify logic (#16084) //<Dominic Gannaway>//
- **[8533c0a16](https://github.com/facebook/react/^Cmmit/8533c0a16 )**: [Fabric] Add dispatchCommand to React Native renderers (#16085) //<Eli White>//
- **[2253bc81d](https://github.com/facebook/react/^Cmmit/2253bc81d )**: [Flare] Switch from currentTarget model to responderTarget model (#16082) //<Dominic Gannaway>//
- **[67e3f3fb6](https://github.com/facebook/react/^Cmmit/67e3f3fb6 )**: [Flare] Revise responder event types (#16081) //<Dominic Gannaway>//
- **[2a0f6390e](https://github.com/facebook/react/^Cmmit/2a0f6390e )**: Fix typos (#16076) //<Min ho Kim>//
- **[aa519c17c](https://github.com/facebook/react/^Cmmit/aa519c17c )**: [Flare] Add currentTarget and unify RN and DOM codepaths (#16066) //<Dominic Gannaway>//
- **[35d2b3bb5](https://github.com/facebook/react/^Cmmit/35d2b3bb5 )**: fix spelling error: resoltion ->  resolution (#16055) //<fnll>//
- **[bd72b0493](https://github.com/facebook/react/^Cmmit/bd72b0493 )**: [Flare] Clear pressStart timeout on pointercancel (#16067) //<Vincent Riemer>//
- **[c40075a72](https://github.com/facebook/react/^Cmmit/c40075a72 )**: [Flare] Remove capture phase Flare events (#16054) //<Dominic Gannaway>//
- **[786186c69](https://github.com/facebook/react/^Cmmit/786186c69 )**: [Flare] createInitialState -> getInitialState (#16051) //<Dominic Gannaway>//
- **[c64f40d71](https://github.com/facebook/react/^Cmmit/c64f40d71 )**: [Flare] Remove dead event target code (#16063) //<Dominic Gannaway>//
- **[e6bfa327d](https://github.com/facebook/react/^Cmmit/e6bfa327d )**: [Flare] Cleanup ReactFiberEvents-test (#16047) //<Dominic Gannaway>//
- **[b365ee281](https://github.com/facebook/react/^Cmmit/b365ee281 )**: [Fire] Remove unused React fire fork (#16046) //<Dominic Gannaway>//
- **[b8f91e664](https://github.com/facebook/react/^Cmmit/b8f91e664 )**: [fail] reset IsThisRendererActing correctly (#16042) //<Sunil Pai>//
- **[bd846459d](https://github.com/facebook/react/^Cmmit/bd846459d )**: [fail] Only warn on unacted effects for strict / non sync modes (#16041) //<Sunil Pai>//
- **[6b946ad9d](https://github.com/facebook/react/^Cmmit/6b946ad9d )**: [Flare] Add more functionality to Scroll event resonder (#16036) //<Dominic Gannaway>//
- **[a457e02ae](https://github.com/facebook/react/^Cmmit/a457e02ae )**: allow nested `act()`s from different renderers (#16039) //<Sunil Pai>//
- **[a865e4a64](https://github.com/facebook/react/^Cmmit/a865e4a64 )**: Clone a custom hook node before use (#16019) //<Anton Korzunov>//
- **[6cf2234a5](https://github.com/facebook/react/^Cmmit/6cf2234a5 )**: [Flare] Do not block mouse presses on scroll (#16033) //<Dominic Gannaway>//
- **[5cb8f6f34](https://github.com/facebook/react/^Cmmit/5cb8f6f34 )**: Add tail="collapsed" option to SuspenseList (#16007) //<Sebastian Markbåge>//
- **[46bd11ac3](https://github.com/facebook/react/^Cmmit/46bd11ac3 )**: Flush sync bug (#16027) //<lunaruan>//
- **[933c664ad](https://github.com/facebook/react/^Cmmit/933c664ad )**: SuspenseList Optimizations (#16005) //<Sebastian Markbåge>//
- **[fbbbea16e](https://github.com/facebook/react/^Cmmit/fbbbea16e )**: fix word async -> concurrent (#15844) //<Heaven>//
- **[eb2ace128](https://github.com/facebook/react/^Cmmit/eb2ace128 )**: [Flare] Bring Flare support to React Native Fabric (#15887) //<Dominic Gannaway>//
- **[9b0bd4355](https://github.com/facebook/react/^Cmmit/9b0bd4355 )**: [Flare] Re-label Flare flag (#16014) //<Dominic Gannaway>//
- **[8b88ac259](https://github.com/facebook/react/^Cmmit/8b88ac259 )**: [Flare] Remove event targets including TouchHitTarget (#16011) //<Dominic Gannaway>//
- **[f11540926](https://github.com/facebook/react/^Cmmit/f11540926 )**: Handle changes at module boundaries (#16002) //<Dan Abramov>//
- **[915dfe697](https://github.com/facebook/react/^Cmmit/915dfe697 )**: Slightly improve performance of hydration. (#15998) //<Benedikt Meurer>//
- **[824e9bec7](https://github.com/facebook/react/^Cmmit/824e9bec7 )**: [Flare] Fix issues with touch + pointer interactions (#15997) //<Dominic Gannaway>//
- **[dd93357aa](https://github.com/facebook/react/^Cmmit/dd93357aa )**: [Flare] Move click handling back into target phase (#15993) //<Dominic Gannaway>//
- **[4d307de45](https://github.com/facebook/react/^Cmmit/4d307de45 )**: Prefix mock Scheduler APIs with _unstable (#15999) //<Andrew Clark>//
- **[9b55bcfc6](https://github.com/facebook/react/^Cmmit/9b55bcfc6 )**: [Flare] Add Hooks to event modules (#15953) //<Brandon Dail>//
- **[20da1dae4](https://github.com/facebook/react/^Cmmit/20da1dae4 )**: Fix error logging in getDerivedStateFromProps (#15797) //<Ricky>//
- **[6088a201e](https://github.com/facebook/react/^Cmmit/6088a201e )**: [Flare] Fix Press scroll cancellation handling (#15983) //<Dominic Gannaway>//
- **[fd601fb21](https://github.com/facebook/react/^Cmmit/fd601fb21 )**: [Flare] Move all event responders to dom directory (#15981) //<Dominic Gannaway>//
- **[827cbc4d0](https://github.com/facebook/react/^Cmmit/827cbc4d0 )**: Rename StatelessComponent to FunctionComponent in react-is/README.md (#15963) //<Veniamin Krol>//
- **[d48db594e](https://github.com/facebook/react/^Cmmit/d48db594e )**: eslint-plugin-react-hooks@1.6.1 //<Dan Abramov>//
- **[7439b48cf](https://github.com/facebook/react/^Cmmit/7439b48cf )**: Add explicit support for ESLint 6.0.0 (#15974) //<Thomas Broyer>//
- **[fce15f14d](https://github.com/facebook/react/^Cmmit/fce15f14d )**: don't fire missing act() warnings for react-art (#15975) //<Sunil Pai>//
- **[20f354696](https://github.com/facebook/react/^Cmmit/20f354696 )**: [Flare] Ensure Press event hook does not execute side-effects (#15976) //<Dominic Gannaway>//
- **[d420d2ccb](https://github.com/facebook/react/^Cmmit/d420d2ccb )**: [Fresh] Retry failed roots on refresh (#15966) //<Dan Abramov>//
- **[04b77c630](https://github.com/facebook/react/^Cmmit/04b77c630 )**: followup to #15763, fix failing test in ReactDOMTracing-test (#15972) //<Sunil Pai>//
- **[e1c5e8720](https://github.com/facebook/react/^Cmmit/e1c5e8720 )**: warn if passive effects get queued outside of an act() call. (#15763) //<Sunil Pai>//
- **[39b97e8eb](https://github.com/facebook/react/^Cmmit/39b97e8eb )**: Report refreshed families to the caller (#15957) //<Dan Abramov>//
- **[d271df5c9](https://github.com/facebook/react/^Cmmit/d271df5c9 )**: Use function expression for custom Hook signature argument (#15956) //<Dan Abramov>//
- **[4189f712c](https://github.com/facebook/react/^Cmmit/4189f712c )**: [Scheduler] Increase max frame length to 300 //<Andrew Clark>//
- **[595c9414b](https://github.com/facebook/react/^Cmmit/595c9414b )**: [Scheduler] Fix navigator.isInputPending call //<Andrew Clark>//
- **[e7fcfe104](https://github.com/facebook/react/^Cmmit/e7fcfe104 )**: [scheduler] Put isPendingInput behind a flag (#15962) //<Andrew Clark>//
- **[6568a7993](https://github.com/facebook/react/^Cmmit/6568a7993 )**: [Scheduler] requestPaint (#15960) //<Andrew Clark>//
- **[8d4ddd33a](https://github.com/facebook/react/^Cmmit/8d4ddd33a )**: [Scheduler] Yield less if there's no pending input (#15959) //<Andrew Clark>//
- **[d77d12510](https://github.com/facebook/react/^Cmmit/d77d12510 )**: Expire rendering the tail of SuspenseList after a timeout (#15946) //<Sebastian Markbåge>//
- **[dc298fdf9](https://github.com/facebook/react/^Cmmit/dc298fdf9 )**: [Flare] Refinements to useEvent hook (#15955) //<Dominic Gannaway>//
- **[696609d49](https://github.com/facebook/react/^Cmmit/696609d49 )**: [Fiber] Clear down dependencies during detachFiber (#15947) //<Dominic Gannaway>//
- **[a5ed2f98f](https://github.com/facebook/react/^Cmmit/a5ed2f98f )**: [Flare] Guard against stateNode being null (#15952) //<Dominic Gannaway>//
- **[34ce57ae7](https://github.com/facebook/react/^Cmmit/34ce57ae7 )**: [Flare] Refine flow type annotations (#15950) //<Dominic Gannaway>//
- **[4f92fbce5](https://github.com/facebook/react/^Cmmit/4f92fbce5 )**: [Flare] Move createEvent back to React object (#15943) //<Dominic Gannaway>//
- **[175111de7](https://github.com/facebook/react/^Cmmit/175111de7 )**: Lazily initialize dependencies object (#15944) //<Andrew Clark>//
- **[720db4cbe](https://github.com/facebook/react/^Cmmit/720db4cbe )**: [Flare] Add useEvent hook implementation (#15927) //<Dominic Gannaway>//
- **[6ff4c9de1](https://github.com/facebook/react/^Cmmit/6ff4c9de1 )**: [Flare] Press: fix stale deactivation region state (#15931) //<Nicolas Gallagher>//
- **[7a4c3e3b7](https://github.com/facebook/react/^Cmmit/7a4c3e3b7 )**: Make global names more obscure (#15941) //<Dan Abramov>//
- **[270dc2e4d](https://github.com/facebook/react/^Cmmit/270dc2e4d )**: Add forwards and backwards options to SuspenseList (#15918) //<Sebastian Markbåge>//
- **[5368f7316](https://github.com/facebook/react/^Cmmit/5368f7316 )**: [Flare] Fix keyboard keyup regression (#15938) //<Dominic Gannaway>//
- **[3d0af2aea](https://github.com/facebook/react/^Cmmit/3d0af2aea )**: Don't consider require-like calls to be likely HOCs (#15940) //<Dan Abramov>//
- **[d4f384d25](https://github.com/facebook/react/^Cmmit/d4f384d25 )**: [Fresh] Throw in prod and change annotation (#15939) //<Dan Abramov>//
- **[ff91bfa58](https://github.com/facebook/react/^Cmmit/ff91bfa58 )**: [act] reset scope depth on synchronous errors (#15937) //<Sunil Pai>//
- **[e61c9e0a2](https://github.com/facebook/react/^Cmmit/e61c9e0a2 )**: [Flare] Fix Press retention state regression (#15936) //<Dominic Gannaway>//
- **[76864f7ff](https://github.com/facebook/react/^Cmmit/76864f7ff )**: Add SuspenseList Component (#15902) //<Sebastian Markbåge>//
- **[e9d0a3ff2](https://github.com/facebook/react/^Cmmit/e9d0a3ff2 )**: [Fresh] Track mounted roots via DevTools Hook (#15928) //<Dan Abramov>//
- **[35ef78de3](https://github.com/facebook/react/^Cmmit/35ef78de3 )**: [Scheduler] Integrated timers (#15911) //<Andrew Clark>//
- **[3af91eb8c](https://github.com/facebook/react/^Cmmit/3af91eb8c )**: [Scheduler] Use continuation pattern for posting host callback (#15910) //<Andrew Clark>//
- **[b62ae1642](https://github.com/facebook/react/^Cmmit/b62ae1642 )**: [Flare] Rename createEventComponent -> createEvent (#15929) //<Dominic Gannaway>//
- **[f4e1ac8ca](https://github.com/facebook/react/^Cmmit/f4e1ac8ca )**: [Flare] Press events include defaultPrevented (#15916) //<Nicolas Gallagher>//
- **[4a7a39b59](https://github.com/facebook/react/^Cmmit/4a7a39b59 )**: [Flare] Add RN build step for ReactTypes (#15926) //<Dominic Gannaway>//
- **[0bd755114](https://github.com/facebook/react/^Cmmit/0bd755114 )**: Remove mention of Prepack (#15922) //<Christoph Nakazawa>//
- **[689beef6f](https://github.com/facebook/react/^Cmmit/689beef6f )**: [Flare] Move unstable_createEventComponent to ReactDOM (#15890) //<Dominic Gannaway>//
- **[98454371a](https://github.com/facebook/react/^Cmmit/98454371a )**: Construct Error at invariant call site for clearer stack traces (#15877) //<Moti Zilberman>//
- **[f97b95166](https://github.com/facebook/react/^Cmmit/f97b95166 )**: [Flare] add disableContextMenu to Press (#15909) //<Nicolas Gallagher>//
- **[cd98e63b4](https://github.com/facebook/react/^Cmmit/cd98e63b4 )**: [Fresh] Fall back to Map/Set if Weak equivalents are not available (#15907) //<Dan Abramov>//
- **[a3c5b1fb8](https://github.com/facebook/react/^Cmmit/a3c5b1fb8 )**: [Fresh] Rename findHostNodesForHotUpdate to findHostInstancesForHotUpdate (#15904) //<Dan Abramov>//
- **[7985bf7d5](https://github.com/facebook/react/^Cmmit/7985bf7d5 )**: Remove outdated test renderer comments (#15898) //<Sebastian Markbåge>//
- **[f0156766d](https://github.com/facebook/react/^Cmmit/f0156766d )**: [Fresh] react-fresh => react-refresh (#15888) //<Dan Abramov>//
- **[801feed95](https://github.com/facebook/react/^Cmmit/801feed95 )**: Interaction tracing works across hidden and SSR hydration boundaries (#15872) //<Brian Vaughn>//
- **[661562fc5](https://github.com/facebook/react/^Cmmit/661562fc5 )**: Fix outdated test comments (#15892) //<Andrew Clark>//
- **[788da69b7](https://github.com/facebook/react/^Cmmit/788da69b7 )**: [Suspense] Fix bad loading state not being delayed (#15891) //<Andrew Clark>//
- **[353e0ee47](https://github.com/facebook/react/^Cmmit/353e0ee47 )**: [Flare] remove stopLocalPropagation option + modify responder ownership (#15889) //<Dominic Gannaway>//
- **[a146c1f9e](https://github.com/facebook/react/^Cmmit/a146c1f9e )**: [Flare] Refactor of Press to fix various issues (#15878) //<Dominic Gannaway>//
- **[de7a09c1e](https://github.com/facebook/react/^Cmmit/de7a09c1e )**: [Fresh] Make transform resilient to plugin order (#15883) //<Dan Abramov>//
- **[2fe8fd290](https://github.com/facebook/react/^Cmmit/2fe8fd290 )**: [Suspense] Use style.setProperty to set display (#15882) //<Andrew Clark>//
- **[e91dd70ba](https://github.com/facebook/react/^Cmmit/e91dd70ba )**: Remove disableYielding feature flag (#15654) //<Andrew Clark>//
- **[4d949d764](https://github.com/facebook/react/^Cmmit/4d949d764 )**: [React Native] Replace touch discrepancy errors to warnings (#15866) //<Timothy Yung>//
- **[45acbdc0b](https://github.com/facebook/react/^Cmmit/45acbdc0b )**: [Flare] Unsure root events are removed on contextmenu (#15862) //<Dominic Gannaway>//
- **[198ed661c](https://github.com/facebook/react/^Cmmit/198ed661c )**: [Suspense] Use !important to hide Suspended nodes (#15861) //<Andrew Clark>//
- **[191920605](https://github.com/facebook/react/^Cmmit/191920605 )**: [Fresh] Implement missing features (#15860) //<Dan Abramov>//
- **[c403ae4d3](https://github.com/facebook/react/^Cmmit/c403ae4d3 )**: [Flare] Move Press root event removal till click phase (#15854) //<Dominic Gannaway>//
- **[f4cd7a38d](https://github.com/facebook/react/^Cmmit/f4cd7a38d )**:  [Flare] Listen to document.body + add stopPropagation to Press (#15853) //<Dominic Gannaway>//
- **[425473f43](https://github.com/facebook/react/^Cmmit/425473f43 )**: [Flare] Improve runtime performance of hit target intersection (#15836) //<Dominic Gannaway>//
- **[def56c979](https://github.com/facebook/react/^Cmmit/def56c979 )**: [Fresh] Capture Hook signatures lazily on first render (#15832) //<Dan Abramov>//
- **[8cfcfe0fc](https://github.com/facebook/react/^Cmmit/8cfcfe0fc )**: [Flare] Fix ES6 issues with IE11 (#15834) //<Dominic Gannaway>//
- **[d0e041aee](https://github.com/facebook/react/^Cmmit/d0e041aee )**: [Fresh] Support classes by force-remounting them on edit (#15801) //<Dan Abramov>//
- **[73c27d8b4](https://github.com/facebook/react/^Cmmit/73c27d8b4 )**: [Flare] Add basic Scroll event responder module (#15827) //<Dominic Gannaway>//
- **[c72dceffb](https://github.com/facebook/react/^Cmmit/c72dceffb )**: [Flare] Small Swipe/Drag fixes (#15825) //<Dominic Gannaway>//
- **[6aaa43708](https://github.com/facebook/react/^Cmmit/6aaa43708 )**: Rename ReactFeatureFlags to remove the `.fb` suffix. (#15826) //<Christoph Nakazawa>//
- **[843a59ab6](https://github.com/facebook/react/^Cmmit/843a59ab6 )**: [React Native] Remove eventTypes from ReactNativeBridgeEventPlugin (#15802) //<Ricky>//
- **[7b28ad119](https://github.com/facebook/react/^Cmmit/7b28ad119 )**: [Flare] EventPriority enum (#15823) //<Andrew Clark>//
- **[d707a7579](https://github.com/facebook/react/^Cmmit/d707a7579 )**: nit: a quick copy edit for an act() message/comment (#15805) //<Sunil Pai>//
- **[cfb79ee5b](https://github.com/facebook/react/^Cmmit/cfb79ee5b )**: [Flare] Fix isTouchEvent (#15824) //<Dominic Gannaway>//
- **[6b5deeed5](https://github.com/facebook/react/^Cmmit/6b5deeed5 )**: [Events] Add support for events that are both user-blocking and continuous (#15811) //<Andrew Clark>//
- **[8d4fb132e](https://github.com/facebook/react/^Cmmit/8d4fb132e )**: [Flare] Fix nativeEvent.x/y for older browsers (#15820) //<Dominic Gannaway>//
- **[2534c0c92](https://github.com/facebook/react/^Cmmit/2534c0c92 )**: [Flare] Add event position properties to Hover responder (#15819) //<Dominic Gannaway>//
- **[dd43cb5fb](https://github.com/facebook/react/^Cmmit/dd43cb5fb )**: [Flare] Fix isPressWithinResponderRegion logic (#15808) //<Nicolas Gallagher>//
- **[4f6cab547](https://github.com/facebook/react/^Cmmit/4f6cab547 )**: [Flare] Ignore keyboard interactions on text input children (#15810) //<Nicolas Gallagher>//
- **[fa1e8df11](https://github.com/facebook/react/^Cmmit/fa1e8df11 )**: chore: use jest-serializer-raw for react-fresh snapshots (#15806) //<Simen Bekkhus>//
- **[07da821bf](https://github.com/facebook/react/^Cmmit/07da821bf )**: [react-native] Rewrite Haste imports in RN shims and add .fb.js extension (#15786) //<James Ide>//
- **[a383c4678](https://github.com/facebook/react/^Cmmit/a383c4678 )**: [ESLint] don't warn for Flow type variables (#15804) //<Jordan Rome>//
- **[5763f1d4c](https://github.com/facebook/react/^Cmmit/5763f1d4c )**: [Events] Nested discrete events across systems //<Andrew Clark>//
- **[7aa35ceae](https://github.com/facebook/react/^Cmmit/7aa35ceae )**: Fix casing of shouldflushDiscreteUpdates //<Andrew Clark>//
- **[91635dd48](https://github.com/facebook/react/^Cmmit/91635dd48 )**: Switch to "discrete" and "continuous" terminology //<Andrew Clark>//
- **[73c380fca](https://github.com/facebook/react/^Cmmit/73c380fca )**: WorkPhase -> ExecutionContext //<Andrew Clark>//
- **[88b396382](https://github.com/facebook/react/^Cmmit/88b396382 )**: [Flare] Remove deprecated keypress event (#15795) //<Nicolas Gallagher>//
- **[63fe08eef](https://github.com/facebook/react/^Cmmit/63fe08eef )**: React Events: allow Tab+Alt on Mac in Focus responder (#15679) //<Mateusz Burzyński>//
- **[113497cc0](https://github.com/facebook/react/^Cmmit/113497cc0 )**: [Suspense] Change Suspending and Restarting Heuristics (#15769) //<Sebastian Markbåge>//
- **[3b2302253](https://github.com/facebook/react/^Cmmit/3b2302253 )**: Fix sizebot (#15771) //<Andrew Clark>//
- **[0f7cc2ba8](https://github.com/facebook/react/^Cmmit/0f7cc2ba8 )**: React Events: check window before using navigator (#15768) //<Nicolas Gallagher>//
- **[2670bc340](https://github.com/facebook/react/^Cmmit/2670bc340 )**: React Events: support legacy browser Spacebar key value (#15766) //<Nicolas Gallagher>//
- **[9aad17d60](https://github.com/facebook/react/^Cmmit/9aad17d60 )**: using the wrong renderer's act() should warn (#15756) //<Sunil Pai>//
- **[1cc3bba00](https://github.com/facebook/react/^Cmmit/1cc3bba00 )**: Parallelizes the build script across multiple processes (#15716) //<Andrew Clark>//
- **[112168f31](https://github.com/facebook/react/^Cmmit/112168f31 )**: Lint rule for unminified errors (#15757) //<Andrew Clark>//
- **[142cf56cb](https://github.com/facebook/react/^Cmmit/142cf56cb )**: [Flare] Adds onContextMenu and fixes some contextmenu related issues (#15761) //<Dominic Gannaway>//
- **[556cc6fe1](https://github.com/facebook/react/^Cmmit/556cc6fe1 )**: [Fresh] Generate signatures for Hooks (#15733) //<Dan Abramov>//
- **[b74fa9868](https://github.com/facebook/react/^Cmmit/b74fa9868 )**: Clean up (#15755) //<Sebastian Markbåge>//
- **[d915a4c1f](https://github.com/facebook/react/^Cmmit/d915a4c1f )**: [Suspense] Add Batched Mode variant to fuzz tester (#15734) //<Andrew Clark>//
- **[401065fe5](https://github.com/facebook/react/^Cmmit/401065fe5 )**: Adds test for #15732. (#15747) //<Caleb Meredith>//
- **[287ef30bb](https://github.com/facebook/react/^Cmmit/287ef30bb )**: [Flare] Deeply prevent default on anchor elements (#15750) //<Dominic Gannaway>//
- **[a97b5c07b](https://github.com/facebook/react/^Cmmit/a97b5c07b )**: [Flare] More fixes for getAbsoluteBoundingClientRect (#15746) //<Dominic Gannaway>//
- **[393924879](https://github.com/facebook/react/^Cmmit/393924879 )**: [Fresh] Babel plugin now handles HOCs + add integration tests (#15724) //<Dan Abramov>//
- **[8af1f8792](https://github.com/facebook/react/^Cmmit/8af1f8792 )**: Rename ReactFiberScheduler -> ReactFiberWorkLoop and extract throwException from Unwind (#15725) //<Sebastian Markbåge>//
- **[399cd0d16](https://github.com/facebook/react/^Cmmit/399cd0d16 )**: Set up cron job to run fuzz tester (#15718) //<Andrew Clark>//
- **[025b07b61](https://github.com/facebook/react/^Cmmit/025b07b61 )**: [Flare] Ensure getAbsoluteBoundingClientRect aligns with offsetParent (#15720) //<Dominic Gannaway>//
- **[61f62246c](https://github.com/facebook/react/^Cmmit/61f62246c )**: [react-native] Use path-based imports instead of Haste for the RN renderer (#15604) //<James Ide>//
- **[b962adfc2](https://github.com/facebook/react/^Cmmit/b962adfc2 )**: [Flare] event component displayName is now mandatory (#15717) //<Dominic Gannaway>//
- **[5c2124fc7](https://github.com/facebook/react/^Cmmit/5c2124fc7 )**: [Fresh] Initial Babel plugin implementation (#15711) //<Dan Abramov>//
- **[b9ebc37c5](https://github.com/facebook/react/^Cmmit/b9ebc37c5 )**: Fix Flow (#15710) //<Dominic Gannaway>//
- **[a25a793fe](https://github.com/facebook/react/^Cmmit/a25a793fe )**: [Flare] update getEventCurrentTarget to use fiber tree (#15708) //<Dominic Gannaway>//
- **[b5dff62fa](https://github.com/facebook/react/^Cmmit/b5dff62fa )**: [Flare] Account for fixed elements in getAbsoluteBoundingClientRect (#15707) //<Dominic Gannaway>//
- **[f50f9ba5d](https://github.com/facebook/react/^Cmmit/f50f9ba5d )**: Fix ReactFiberNewContext spelling (#15692) //<Maksim Markelov>//
- **[e180f656f](https://github.com/facebook/react/^Cmmit/e180f656f )**: Flare: change flushDiscreteUpdates invariant to warning (#15702) //<Dominic Gannaway>//
- **[7829d8cf9](https://github.com/facebook/react/^Cmmit/7829d8cf9 )**: Fix missing return pointer assignment (#15700) //<Andrew Clark>//
- **[d7afe23f1](https://github.com/facebook/react/^Cmmit/d7afe23f1 )**: Rename "loading" to "busy" in SuspenseConfig API (#15699) //<Sebastian Markbåge>//
- **[ef4ac42f8](https://github.com/facebook/react/^Cmmit/ef4ac42f8 )**: [Flare] Update interactiveUpdates flushing heuristics (#15687) //<Dominic Gannaway>//
- **[6d4f85b61](https://github.com/facebook/react/^Cmmit/6d4f85b61 )**: [Fresh] Set up infra for runtime and Babel plugin (#15698) //<Dan Abramov>//
- **[121acae09](https://github.com/facebook/react/^Cmmit/121acae09 )**: Flare: simplify dispatchEvent discrete argument (#15694) //<Dominic Gannaway>//
- **[a398cbd5a](https://github.com/facebook/react/^Cmmit/a398cbd5a )**: Flare: update invalid accessor warnings + add no-ops (#15693) //<Dominic Gannaway>//
- **[9c9ea9485](https://github.com/facebook/react/^Cmmit/9c9ea9485 )**: flush only on exiting outermost act() (#15682) //<Sunil Pai>//
- **[50b50c26f](https://github.com/facebook/react/^Cmmit/50b50c26f )**: Inform DevTools of commit priority level (#15664) //<Brian Vaughn>//
- **[0bd9b5d00](https://github.com/facebook/react/^Cmmit/0bd9b5d00 )**: [Fresh] Support re-rendering lazy() without losing state (#15686) //<Dan Abramov>//
- **[ec38def44](https://github.com/facebook/react/^Cmmit/ec38def44 )**: [Fresh] Don't traverse remounted trees (#15685) //<Dan Abramov>//
- **[5731e522d](https://github.com/facebook/react/^Cmmit/5731e522d )**: [Fresh] Support lazy() and add Suspense tests (#15681) //<Dan Abramov>//
- **[31487dd82](https://github.com/facebook/react/^Cmmit/31487dd82 )**: [Fresh] Set up initial scaffolding (#15619) //<Dan Abramov>//
- **[9c6de716d](https://github.com/facebook/react/^Cmmit/9c6de716d )**: Add withSuspenseConfig API (#15593) //<Sebastian Markbåge>//
- **[1160b3769](https://github.com/facebook/react/^Cmmit/1160b3769 )**: Event API: Add responder allowMultipleHostChildren flag (#15646) //<Dominic Gannaway>//
- **[95e06ac3d](https://github.com/facebook/react/^Cmmit/95e06ac3d )**: Event API: isTargetWithinEventResponderScope on unmounted event components (#15672) //<Dominic Gannaway>//
- **[d278a3ff8](https://github.com/facebook/react/^Cmmit/d278a3ff8 )**: `act()` - s / flushPassiveEffects / Scheduler.unstable_flushWithoutYielding (#15591) //<Sunil Pai>//
- **[aad5a264d](https://github.com/facebook/react/^Cmmit/aad5a264d )**: Event API: ensure calculateResponderRegion accounts for page offset (#15671) //<Dominic Gannaway>//
- **[bb89b4eac](https://github.com/facebook/react/^Cmmit/bb89b4eac )**: Bail out of updates in offscreen trees (#15666) //<Dan Abramov>//
- **[4bf88ddec](https://github.com/facebook/react/^Cmmit/4bf88ddec )**: Fix <embed> not triggering onLoad (#15614) //<Andrew Cherniavskii>//
- **[f961050a3](https://github.com/facebook/react/^Cmmit/f961050a3 )**: Always flushPassiveEffects before rendering //<Andrew Clark>//
- **[b899819e7](https://github.com/facebook/react/^Cmmit/b899819e7 )**: Use dynamic flag in test renderer in www (#15662) //<Andrew Clark>//
- **[d34b457ce](https://github.com/facebook/react/^Cmmit/d34b457ce )**: Feature flag to revert #15650 (#15659) //<Andrew Clark>//
- **[668fbd651](https://github.com/facebook/react/^Cmmit/668fbd651 )**: Fix serial passive effects (#15650) //<Andrew Clark>//
- **[b0657fde6](https://github.com/facebook/react/^Cmmit/b0657fde6 )**: Event API: ensure getFocusableElementsInScope handles suspended trees (#15651) //<Dominic Gannaway>//
- **[8af90c897](https://github.com/facebook/react/^Cmmit/8af90c897 )**: Add test for nested avoided boundaries (#15636) //<Sebastian Markbåge>//
- **[af19e2eb2](https://github.com/facebook/react/^Cmmit/af19e2eb2 )**: Event API: adds pointerType to Focus events (#15645) //<Dominic Gannaway>//
- **[cc24d0ea5](https://github.com/facebook/react/^Cmmit/cc24d0ea5 )**: Invariant that throws when committing wrong tree (#15517) //<Andrew Clark>//
- **[83fc258f2](https://github.com/facebook/react/^Cmmit/83fc258f2 )**: Remove <ConcurrentMode /> (#15532) //<Andrew Clark>//
- **[283ce5320](https://github.com/facebook/react/^Cmmit/283ce5320 )**: Add ReactDOM.unstable_createSyncRoot (#15504) //<Andrew Clark>//
- **[862f499fa](https://github.com/facebook/react/^Cmmit/862f499fa )**: Add Batched Mode (#15502) //<Andrew Clark>//
- **[fec74f99d](https://github.com/facebook/react/^Cmmit/fec74f99d )**: Event API: ensure preventDefault works for nested targets (#15633) //<Dominic Gannaway>//
- **[edfedf3ae](https://github.com/facebook/react/^Cmmit/edfedf3ae )**: Fork ReactSharedInternals for UMD builds (#15617) //<Andrew Clark>//
- **[39ef609e7](https://github.com/facebook/react/^Cmmit/39ef609e7 )**: Update test to fix CI //<Andrew Clark>//
- **[5b6eb55e1](https://github.com/facebook/react/^Cmmit/5b6eb55e1 )**: Remove scheduler from React package dependencies (#15616) //<Andrew Clark>//
- **[0803d2247](https://github.com/facebook/react/^Cmmit/0803d2247 )**: Don't consider "Never" expiration as part of most recent event time (#15606) //<Sebastian Markbåge>//
- **[90f54d77f](https://github.com/facebook/react/^Cmmit/90f54d77f )**: Event API: add follow up event unwind test (#15612) //<Dominic Gannaway>//
- **[91a044e31](https://github.com/facebook/react/^Cmmit/91a044e31 )**: Event API: add key modifiers to Press events (#15611) //<Dominic Gannaway>//
- **[3d8b836e2](https://github.com/facebook/react/^Cmmit/3d8b836e2 )**: Event API: ensure we pop context for event system fibers (#15599) //<Dominic Gannaway>//
- **[e33e32db0](https://github.com/facebook/react/^Cmmit/e33e32db0 )**: Event API: normalize event timeStamp property to be in event system (#15598) //<Dominic Gannaway>//
- **[3669b9010](https://github.com/facebook/react/^Cmmit/3669b9010 )**: Event API: add more warnings for responder based events (#15597) //<Dominic Gannaway>//
- **[05d08500b](https://github.com/facebook/react/^Cmmit/05d08500b )**: Experimental Event API: Press event properties (#15586) //<Dominic Gannaway>//
- **[51e66cf9f](https://github.com/facebook/react/^Cmmit/51e66cf9f )**: Experimental Event API: reduce code size of event modules (#15590) //<Dominic Gannaway>//
- **[8abf243b8](https://github.com/facebook/react/^Cmmit/8abf243b8 )**: Ensure touch events are properly handled for pageX and pageY (#15587) //<Dominic Gannaway>//
- **[c7398f339](https://github.com/facebook/react/^Cmmit/c7398f339 )**: Add Suspense Boundary Context (and unstable_avoidThisFallback) (#15578) //<Sebastian Markbåge>//
- **[f9e60c8a1](https://github.com/facebook/react/^Cmmit/f9e60c8a1 )**: Warn when suspending at wrong priority (#15492) //<Andrew Clark>//
- **[89d8d1435](https://github.com/facebook/react/^Cmmit/89d8d1435 )**: Add React.unstable_createEventComponent (#15580) //<Nicolas Gallagher>//
- **[6da04b5d8](https://github.com/facebook/react/^Cmmit/6da04b5d8 )**: Fix interaction tracing for batched update mounts (#15567) //<Brian Vaughn>//
- **[d38cfd452](https://github.com/facebook/react/^Cmmit/d38cfd452 )**: Ensure TouchHitTarget element is server side rendered with hit slop (#15385) //<Dominic Gannaway>//
- **[2e5d1a8b9](https://github.com/facebook/react/^Cmmit/2e5d1a8b9 )**: React Events: fix cancel events for Press (#15563) //<Nicolas Gallagher>//
- **[307e0a7d7](https://github.com/facebook/react/^Cmmit/307e0a7d7 )**: React Events: cancel onLongPress for large enough moves (#15562) //<Nicolas Gallagher>//
- **[339366c46](https://github.com/facebook/react/^Cmmit/339366c46 )**: Event API: Support press reentry for pointer events (#15560) //<Dominic Gannaway>//

Changelog:
[General][Changed] - React sync for revisions ec6691a...55bc393

Reviewed By: yungsters

Differential Revision: D16555458

fbshipit-source-id: 2d71da52992fbb05b682247cfee20385d70a681b
@janicduplessis
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Ok I don't have time to work on this so closing for now.

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