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Use Passive flag to schedule onPostCommit #19862

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merged 1 commit into from
Sep 18, 2020

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@acdlite acdlite commented Sep 18, 2020

Instead of calling onPostCommit in a separate phase, we can fire them during the same traversal as the rest of the passive effects.

This works because effects are executed depth-first. So by the time we reach a Profiler node, we'll have already executed all the effects in its subtree.

Instead of calling `onPostCommit` in a separate phase, we can fire
them during the same traversal as the rest of the passive effects.

This works because effects are executed depth-first. So by the time we
reach a Profiler node, we'll have already executed all the effects in
its subtree.
@facebook-github-bot facebook-github-bot added CLA Signed React Core Team Opened by a member of the React Core Team labels Sep 18, 2020
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Comparing: 50d9451...ff96d8a

react-dom

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ReactDOM-prod.js 0.0% -0.0% 385.83 KB 385.83 KB 71.1 KB 71.1 KB FB_WWW_PROD
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Cool 👍

I think we could address the TODO by moving the Passive flag update into the complete phase, where we could conditionally set it based on subtreeFlags & Passive. The one case that wouldn't account for would be deletions, but I think we could account for that by also checking if flags & Deletion.

I think some Profiler tests would fail b'c they were written to expect the (broken) behavior of onPostCommit getting called even when there were no passive effects...

Maybe I'll tackle this as a follow up PR. It's possible I'm over simplifying something. :)

parentFiber = parentFiber.return;
// Bubble times to the next nearest ancestor Profiler.
// After we process that Profiler, we'll bubble further up.
// TODO: Use JS Stack instead
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Roughly this (typed it out fast, might be a mistake)

let nearestProfiler = null;

function commitWork(finishedWork) {
  switch (finishedWork.tag) {
    case Profiler: {
      // Can push/pop values onto stack before entering/leaving a subtree, like
      // how we do in the render phase, except since this is a recursive
      // function we can use the regular JS stack instead of our fake
      // fiber stack.
      //
      // This is the code for Profiler. We'd do something similar for Offscreen.
      if (finishedWork.subtreeFlags & FlagForThisPhase) {
        const prevProfilerOnStack = nearestProfiler;
        nearestProfiler = finishedWork;

        try {
          let child = finishedWork.child;
          while (child !== null) {
            commitWork(child);
            child = child.sibling;
          }
        } finally {
          nearestProfiler = prevProfilerOnStack;
        }
      }

      commitProfilerEffect(finishedWork);
      break;
    }
    default: {
      // Normal path, no pushing or popping
      if (finishedWork.subtreeFlags & FlagForThisPhase) {
        let child = finishedWork.child;
        while (child !== null) {
          commitWork(child);
          child = child.sibling;
        }
      }

      switch (finishedWork.tag) {
        case FunctionComponent: {
          // Can reference `nearestProfiler` here
          commitFunctionComponent(finishedWork, nearestProfiler);
          break;
        }
        // ... and so on
      }
      break;
    }
  }
}

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Happy to pick this TODO up if you haven't already started on it. Let me know.

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Circling back on this.

It's possible that I'm misunderstanding what you're suggesting, but I think the pseudo-code solution is missing a few things.

There are two places we walk the return path to find the nearest Profiler ancestor:

  • commitLifeCycles to bubble up layout effect durations from one Profiler to the next.
  • commitProfilerPassiveEffect to bubble up passive effect durations from one Profiler to the next.

Neither of these functions are recursive. The work loop functions that call them are (e.g. commitLayoutEffects and flushPassiveMountEffects) so maybe that's what you meant to show instead with the above pseudo-code example?

There's another snag though. These durations bubble up one Profiler at a time. The "TODO" code in question is just bubbling the durations from the current Profiler to the next nearest (ancestor) Profiler. If we used a stack for this, the top of the stack would always just point to the current Profiler (which we already have, since its the current Fiber we're working on). So we'd need to maintain pointers to the top two Profilers in the stack.

This could work, but it's not as clean an implementation as you were perhaps thinking? I'll post a PR.

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The work loop functions that call them are (e.g. commitLayoutEffects and flushPassiveMountEffects) so maybe that's what you meant to show instead with the above pseudo-code example?

Yeah commitWork in my example is meant to correspond to commitLayoutEffects et al

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Gotcha.

The naming of commitWork confused the heck out of me then, given where the TODO comments were previously (in ReactFiberCommitWork - which also has a function called commitWork)

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acdlite commented Sep 18, 2020

Maybe I'll tackle this as a follow up PR. It's possible I'm over simplifying something. :)

I'm about to open this PR :D Will send in a bit

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bvaughn commented Sep 18, 2020

Ahh no I've already started it ;)

But that's fine if you have too. The slowest part is just spot checking the few Profiler tests that fail (as they should) to make sure none are legit failures.

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acdlite commented Sep 18, 2020

The slowest part is just spot checking the few Profiler tests that fail (as they should) to make sure none are legit failures.

Yeah that's the part I hadn't finished yet. How about I'll push what I've got and let you update the tests to be sure nothing is wrong?

@acdlite acdlite merged commit 8b2d378 into facebook:master Sep 18, 2020
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acdlite commented Sep 18, 2020

@bvaughn Here's the follow-up PR #19863

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bvaughn commented Sep 19, 2020

😆 I had already done the other part too. Updating the tests is the boring part.

It's fine. We can sort it out on Monday!

chrstnv added a commit to chrstnv/react that referenced this pull request Sep 20, 2020
Instead of calling `onPostCommit` in a separate phase, we can fire
them during the same traversal as the rest of the passive effects.

This works because effects are executed depth-first. So by the time we
reach a Profiler node, we'll have already executed all the effects in
its subtree.
facebook-github-bot pushed a commit to facebook/react-native that referenced this pull request Oct 27, 2020
Summary:
This sync includes the following changes:
- **[eaaf4cbce](facebook/react@eaaf4cbce )**: 17.0.1 //<Dan Abramov>//
- **[6f62abb58](facebook/react@6f62abb58 )**: Remove usage of Array#fill ([#20071](facebook/react#20071)) //<Dan Abramov>//
- **[40cfe1f48](facebook/react@40cfe1f48 )**: Update CHANGELOG.md //<Dan Abramov>//
- **[f021a983a](facebook/react@f021a983a )**: Bump versions for 17 ([#20062](facebook/react#20062)) //<Dan Abramov>//
- **[d1bb4d851](facebook/react@d1bb4d851 )**: Profiler: Include ref callbacks in onCommit duration ([#20060](facebook/react#20060)) //<Brian Vaughn>//
- **[c59c3dfe5](facebook/react@c59c3dfe5 )**: useRef: Warn about reading or writing mutable values during render ([#18545](facebook/react#18545)) //<Brian Vaughn>//
- **[7b6cac952](facebook/react@7b6cac952 )**: Improved Profiler commit hooks test ([#20053](facebook/react#20053)) //<Brian Vaughn>//
- **[dfb6a4033](facebook/react@dfb6a4033 )**: [Fast Refresh] Fix crashes caused by rogue Proxies ([#20030](facebook/react#20030)) ([#20039](facebook/react#20039)) //<Kai Riemann>//
- **[37cb732c5](facebook/react@37cb732c5 )**: Use bitwise OR to define flag masks ([#20044](facebook/react#20044)) //<Andrew Clark>//
- **[eb3181e77](facebook/react@eb3181e77 )**: Add Visibility flag for hiding/unhiding trees ([#20043](facebook/react#20043)) //<Andrew Clark>//
- **[0dd809bdf](facebook/react@0dd809bdf )**: Remove last schedulePassiveEffectCallback call ([#20042](facebook/react#20042)) //<Andrew Clark>//
- **[8df7b7911](facebook/react@8df7b7911 )**: Remove Passive flag from "before mutation" phase ([#20038](facebook/react#20038)) //<Andrew Clark>//
- **[c57fe4a2c](facebook/react@c57fe4a2c )**: ReactIs.isValidElementType Unit Test extended with PureComponent case ([#20033](facebook/react#20033)) //<adasq>//
- **[02da938fd](facebook/react@02da938fd )**: Don't double-invoke effects in legacy roots ([#20028](facebook/react#20028)) //<Brian Vaughn>//
- **[d95c4938d](facebook/react@d95c4938d )**: [EventSystem] Revise onBeforeBlur propagation mechanics ([#20020](facebook/react#20020)) //<Dominic Gannaway>//
- **[f46a80ae1](facebook/react@f46a80ae1 )**: Update outdated links and fix two broken links  ([#19985](facebook/react#19985)) //<Saikat Guha>//
- **[0a4c7c565](facebook/react@0a4c7c565 )**: [Flight] Don't warn for key, but error for ref ([#19986](facebook/react#19986)) //<Sebastian Markbåge>//
- **[993ca533b](facebook/react@993ca533b )**: Enable eager listeners statically ([#19983](facebook/react#19983)) //<Dan Abramov>//
- **[40c52de96](facebook/react@40c52de96 )**: [Flight] Add Runtime Errors for Non-serializable Values ([#19980](facebook/react#19980)) //<Sebastian Markbåge>//
- **[1992d9730](facebook/react@1992d9730 )**: Revert "Temporarily disable Profiler commit hooks flag ([#19900](facebook/react#19900))" ([#19960](facebook/react#19960)) //<Brian Vaughn>//
- **[44d39c4d7](facebook/react@44d39c4d7 )**: Removed skip-error-boundaries modifications from old fork ([#19961](facebook/react#19961)) //<Brian Vaughn>//
- **[cc77be957](facebook/react@cc77be957 )**: Remove unnecessary error overriding in ([#19949](facebook/react#19949)) //<Paul Doyle>//
- **[97625272a](facebook/react@97625272a )**: Debug tracing tests for CPU bound suspense ([#19943](facebook/react#19943)) //<Brian Vaughn>//
- **[43363e279](facebook/react@43363e279 )**: Fix codestyle for typeof comparison ([#19928](facebook/react#19928)) //<Eugene Maslovich>//
- **[5427b4657](facebook/react@5427b4657 )**: Temporarily disable Profiler commit hooks flag ([#19900](facebook/react#19900)) //<Brian Vaughn>//
- **[1faf9e3dd](facebook/react@1faf9e3dd )**: Suspense for CPU-bound trees ([#19936](facebook/react#19936)) //<Andrew Clark>//
- **[7f08e908b](facebook/react@7f08e908b )**: Fix missing context to componentDidMount() when double-invoking lifecycles ([#19935](facebook/react#19935)) //<Brian Vaughn>//
- **[9198a5cec](facebook/react@9198a5cec )**: Refactor layout effect methods ([#19895](facebook/react#19895)) //<Brian Vaughn>//
- **[ba82eea38](facebook/react@ba82eea38 )**: Remove disableSchedulerTimeoutInWorkLoop flag ([#19902](facebook/react#19902)) //<Andrew Clark>//
- **[c63741fb3](facebook/react@c63741fb3 )**: offscreen double invoke effects ([#19523](facebook/react#19523)) //<Luna Ruan>//
- **[c6917346f](facebook/react@c6917346f )**: Fixed broken Profiler test ([#19894](facebook/react#19894)) //<Brian Vaughn>//
- **[87c023b1c](facebook/react@87c023b1c )**: Profiler onRender only called when we do work ([#19885](facebook/react#19885)) //<Brian Vaughn>//
- **[81aaee56a](facebook/react@81aaee56a )**: Don't call onCommit et al if there are no effects ([#19863](facebook/react#19863)) //<Andrew Clark>//
- **[7355bf575](facebook/react@7355bf575 )**: Consolidate commit phase hook functions ([#19864](facebook/react#19864)) //<Andrew Clark>//
- **[bc6b7b6b1](facebook/react@bc6b7b6b1 )**: Don't trigger lazy in DEV during element creation ([#19871](facebook/react#19871)) //<Dan Abramov>//
- **[a774502e0](facebook/react@a774502e0 )**: Use single quotes in getComponentName return ([#19873](facebook/react#19873)) //<Gustavo Saiani>//
- **[8b2d3783e](facebook/react@8b2d3783e )**: Use Passive flag to schedule onPostCommit ([#19862](facebook/react#19862)) //<Andrew Clark>//
- **[50d9451f3](facebook/react@50d9451f3 )**: Improve DevTools editing interface ([#19774](facebook/react#19774)) //<Brian Vaughn>//
- **[6fddca27e](facebook/react@6fddca27e )**: Remove passive intervention flag ([#19849](facebook/react#19849)) //<Dan Abramov>//
- **[36df9185c](facebook/react@36df9185c )**: chore(docs): Removed outdated comment about fb.me link  ([#19830](facebook/react#19830)) //<Adnaan Bheda>//
- **[16fb2b6f9](facebook/react@16fb2b6f9 )**: Moved resetChildLanes into complete work ([#19836](facebook/react#19836)) //<Brian Vaughn>//
- **[cc581065d](facebook/react@cc581065d )**: [email protected] //<Dan Abramov>//
- **[0044805c8](facebook/react@0044805c8 )**: Update CHANGELOG.md //<Dan Abramov>//
- **[0f70d4dd6](facebook/react@0f70d4dd6 )**: Consider components in jsx as missing dependencies in typescript-eslint/[email protected] ([#19815](facebook/react#19815)) //<Sebastian Silbermann>//
- **[84558c61b](facebook/react@84558c61b )**: Don't visit passive effects during layout phase ([#19809](facebook/react#19809)) //<Andrew Clark>//
- **[ad8a0a8cd](facebook/react@ad8a0a8cd )**: [email protected] //<Dan Abramov>//
- **[77544a0d6](facebook/react@77544a0d6 )**: Update CHANGELOG.md //<Dan Abramov>//
- **[ed4fdfc73](facebook/react@ed4fdfc73 )**: test(eslint-plugin-react-hooks): Run with TS parsers >= 2.x ([#19792](facebook/react#19792)) //<Sebastian Silbermann>//
- **[cd75f93c0](facebook/react@cd75f93c0 )**: eslint-plugin-react-hooks: fix compatibility with typescript-eslint/[email protected]+ ([#19751](facebook/react#19751)) //<Matthias Schiffer>//
- **[781212aab](facebook/react@781212aab )**: Remove double space in test name ([#19762](facebook/react#19762)) //<Gustavo Saiani>//
- **[e7b255341](facebook/react@e7b255341 )**: Internal `act`: Flush timers at end of scope ([#19788](facebook/react#19788)) //<Andrew Clark>//
- **[d17086c7c](facebook/react@d17086c7c )**: Decouple public, internal act implementation ([#19745](facebook/react#19745)) //<Andrew Clark>//
- **[d38ec17b1](facebook/react@d38ec17b1 )**: [Flight] Set dispatcher for duration of performWork() ([#19776](facebook/react#19776)) //<Joseph Savona>//
- **[4f3f7eeb7](facebook/react@4f3f7eeb7 )**: Bugfix: Effect clean up when deleting suspended tree ([#19752](facebook/react#19752)) //<Andrew Clark>//
- **[7baf9d412](facebook/react@7baf9d412 )**: Combine Flags and SubtreeFlags types ([#19775](facebook/react#19775)) //<Andrew Clark>//
- **[166544360](facebook/react@166544360 )**: Rename effect fields ([#19755](facebook/react#19755)) //<Andrew Clark>//
- **[708fa77a7](facebook/react@708fa77a7 )**: Decrease expiration time of input updates ([#19772](facebook/react#19772)) //<Andrew Clark>//
- **[36df483af](facebook/react@36df483af )**: Add feature flag to disable scheduler timeout in work loop ([#19771](facebook/react#19771)) //<Ricky>//
- **[bcc0aa463](facebook/react@bcc0aa463 )**: Revert "Revert "Remove onScroll bubbling flag ([#19535](facebook/react#19535))" ([#19655](facebook/react#19655))" ([#19761](facebook/react#19761)) //<Dan Abramov>//
- **[99cae887f](facebook/react@99cae887f )**: Add failing test for passive effect cleanup functions and memoized components ([#19750](facebook/react#19750)) //<Brian Vaughn>//
- **[2cfd73c4d](facebook/react@2cfd73c4d )**: Fix typo in comment (Noticable→Noticeable) ([#19737](facebook/react#19737)) //<Ikko Ashimine>//
- **[53e622ca7](facebook/react@53e622ca7 )**: Fix instances of function declaration after return ([#19733](facebook/react#19733)) //<Bhumij Gupta>//
- **[b7d18c4da](facebook/react@b7d18c4da )**: Support Babel's envName option in React Refresh plugin ([#19009](facebook/react#19009)) //<Kevin Weber>//
- **[1f38dcff6](facebook/react@1f38dcff6 )**: Remove withSuspenseConfig ([#19724](facebook/react#19724)) //<Andrew Clark>//
- **[1396e4a8f](facebook/react@1396e4a8f )**: Fixes eslint warning when node type is ChainExpression ([#19680](facebook/react#19680)) //<Pascal Fong Kye>//
- **[a8500be89](facebook/react@a8500be89 )**: Add `startTransition` as a known stable method ([#19720](facebook/react#19720)) //<Andrew Clark>//
- **[380dc95de](facebook/react@380dc95de )**: Revert "Append text string to <Text> error message ([#19581](facebook/react#19581))" ([#19723](facebook/react#19723)) //<Timothy Yung>//
- **[ddd1faa19](facebook/react@ddd1faa19 )**: Remove config argument from useTransition ([#19719](facebook/react#19719)) //<Andrew Clark>//
- **[92fcd46cc](facebook/react@92fcd46cc )**: Replace SuspenseConfig object with an integer ([#19706](facebook/react#19706)) //<Andrew Clark>//
- **[b754caaaf](facebook/react@b754caaaf )**: Enable eager listeners in open source ([#19716](facebook/react#19716)) //<Dan Abramov>//
- **[c1ac05215](facebook/react@c1ac05215 )**: [Flight] Support more element types and Hooks for Server and Hybrid Components ([#19711](facebook/react#19711)) //<Dan Abramov>//
- **[1eaafc9ad](facebook/react@1eaafc9ad )**: Clean up timeoutMs-related implementation details ([#19704](facebook/react#19704)) //<Andrew Clark>//
- **[8da0da093](facebook/react@8da0da093 )**: Disable timeoutMs argument ([#19703](facebook/react#19703)) //<Andrew Clark>//
- **[60ba723bf](facebook/react@60ba723bf )**: Add SuspenseList to devTools ([#19684](facebook/react#19684)) //<Ben Pernick>//
- **[5564f2c95](facebook/react@5564f2c95 )**: Add React.startTransition ([#19696](facebook/react#19696)) //<Ricky>//
- **[c4e0768d7](facebook/react@c4e0768d7 )**: Remove unused argument from `finishConcurrentRender` ([#19689](facebook/react#19689)) //<inottn>//
- **[848bb2426](facebook/react@848bb2426 )**: Attach Listeners Eagerly to Roots and Portal Containers ([#19659](facebook/react#19659)) //<Dan Abramov>//
- **[d2e914ab4](facebook/react@d2e914ab4 )**: Remove remaining references to effect list ([#19673](facebook/react#19673)) //<Andrew Clark>//
- **[d6e433899](facebook/react@d6e433899 )**: Use Global Render Timeout for CPU Suspense ([#19643](facebook/react#19643)) //<Sebastian Markbåge>//
- **[64ddef44c](facebook/react@64ddef44c )**: Revert "Remove onScroll bubbling flag ([#19535](facebook/react#19535))" ([#19655](facebook/react#19655)) //<Dan Abramov>//
- **[dd651df05](facebook/react@dd651df05 )**: Keep onTouchStart, onTouchMove, and onWheel passive ([#19654](facebook/react#19654)) //<Dan Abramov>//
- **[b8fa09e9e](facebook/react@b8fa09e9e )**: provide profiling bundle for react-reconciler ([#19559](facebook/react#19559)) //<Julien Gilli>//
- **[23595ff59](facebook/react@23595ff59 )**: Add missing param to safelyCallDestroy() ([#19638](facebook/react#19638)) //<Brian Vaughn>//
- **[ee409ea3b](facebook/react@ee409ea3b )**: change destroy to safelyCallDestroy ([#19605](facebook/react#19605)) //<Luna Ruan>//
- **[bcca5a6ca](facebook/react@bcca5a6ca )**: Always skip unmounted/unmounting error boundaries ([#19627](facebook/react#19627)) //<Brian Vaughn>//
- **[1a41a196b](facebook/react@1a41a196b )**: Append text string to <Text> error message ([#19581](facebook/react#19581)) //<Timothy Yung>//
- **[e4afb2fdd](facebook/react@e4afb2fdd )**: [email protected] //<Dan Abramov>//
- **[ced05c46c](facebook/react@ced05c46c )**: Update CHANGELOG.md //<Dan Abramov>//
- **[702fad4b1](facebook/react@702fad4b1 )**: refactor fb.me redirect link to reactjs.org/link ([#19598](facebook/react#19598)) //<CY Lim>//
- **[49cd77d24](facebook/react@49cd77d24 )**: fix: leak strict mode with UMD builds ([#19614](facebook/react#19614)) //<Toru Kobayashi>//
- **[ffb749c95](facebook/react@ffb749c95 )**: Improve error boundary handling for unmounted subtrees ([#19542](facebook/react#19542)) //<Brian Vaughn>//
- **[9b35dd2fc](facebook/react@9b35dd2fc )**: Permanently removed component stacks from scheduling profiler data ([#19615](facebook/react#19615)) //<Brian Vaughn>//
- **[3f8115cdd](facebook/react@3f8115cdd )**: Remove `didTimeout` check from work loop //<Andrew Clark>//
- **[9abc2785c](facebook/react@9abc2785c )**: Remove wasteful checks from `shouldYield` //<Andrew Clark>//
- **[1d5e10f70](facebook/react@1d5e10f70 )**: [eslint-plugin-react-hooks] Report constant constructions ([#19590](facebook/react#19590)) //<Jordan Eldredge>//
- **[dab0854c5](facebook/react@dab0854c5 )**: Move commit passive unmount/mount to CommitWork ([#19599](facebook/react#19599)) //<Sebastian Markbåge>//
- **[ccb6c3945](facebook/react@ccb6c3945 )**: Remove unused argument ([#19600](facebook/react#19600)) //<inottn>//
- **[629125555](facebook/react@629125555 )**: [Scheduler] Re-throw unhandled errors ([#19595](facebook/react#19595)) //<Andrew Clark>//
- **[b8ed6a1aa](facebook/react@b8ed6a1aa )**: [Scheduler] Call postTask directly ([#19551](facebook/react#19551)) //<Andrew Clark>//
- **[ce37bfad5](facebook/react@ce37bfad5 )**: Remove resolutions from test renderer package.json ([#19577](facebook/react#19577)) //<Dan Abramov>//
- **[2704bb537](facebook/react@2704bb537 )**: Add ReactVersion to SchedulingProfiler render scheduled marks ([#19553](facebook/react#19553)) //<Kartik Choudhary>//
- **[0c52e24cb](facebook/react@0c52e24cb )**: Support inner component _debugOwner in memo ([#19556](facebook/react#19556)) //<Brian Vaughn>//
- **[0cd9a6de5](facebook/react@0cd9a6de5 )**: Parallelize Jest in CI ([#19552](facebook/react#19552)) //<Andrew Clark>//
- **[a63893ff3](facebook/react@a63893ff3 )**: Warn about undefined return value for memo and forwardRef ([#19550](facebook/react#19550)) //<Brian Vaughn>//
- **[32ff42868](facebook/react@32ff42868 )**: Add feature flag for setting update lane priority ([#19401](facebook/react#19401)) //<Ricky>//
- **[5bdd4c8c6](facebook/react@5bdd4c8c6 )**: Remove unused argument from call to jest method ([#19546](facebook/react#19546)) //<Gustavo Saiani>//
- **[a5fed98a9](facebook/react@a5fed98a9 )**: Register more node types that are used later as JSXIdentifiers ([#19514](facebook/react#19514)) //<Mateusz Burzyński>//
- **[f77c7b9d7](facebook/react@f77c7b9d7 )**: Re-add discrete flushing timeStamp heuristic (behind flag) ([#19540](facebook/react#19540)) //<Dominic Gannaway>//

Changelog: [general] [feature] Upgrade to React 17

Reviewed By: cpojer

Differential Revision: D24491201

fbshipit-source-id: c947da9dcccbd614e9dc58f3339b63e24829aca7
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Instead of calling `onPostCommit` in a separate phase, we can fire
them during the same traversal as the rest of the passive effects.

This works because effects are executed depth-first. So by the time we
reach a Profiler node, we'll have already executed all the effects in
its subtree.
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