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Add React.startTransition #19696

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merged 2 commits into from Aug 26, 2020

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@rickhanlonii rickhanlonii commented Aug 26, 2020

Overview

Experimental only

This PR adds startTransition to the isomorphic package.

Details

The useTransition hook allows deferring an update from appearing on the screen until all content is loaded in the next screen. As a hook this is useful because most of the time the trigger for an update is inside an event, like a click handler:

function App() {
  const [currentPage, setPage] = useState('home');
  const [startTransition, isPending] = useTransition();

  function handleClick(nextPage) {
    startTransition(() => {
      setPage(nextPage);
    })
  }

  return <Page page={currentPage} onClick={handleClick} isPending={isPending} /> 
}

But this doesn't cover use cases that which don't have access to hooks. Sometimes you may want to trigger an update that causes a transition from outside of a component:

let setPageOutsideComponent;

function App() {
  const [currentPage, setPage] = useState('home');
  setPageOutsideComponent = setPage;

  return <Page page={currentPage} /> 
}

// This could be in a data listener, or action creator.
// Anything that could trigger an update from outside the component.
setPageOutsideComponent('about');

These use cases also need to be able to defer an update, and for that we're exposing React.startTransition:

React.startTransition(() => {
  setPageOutsideComponent('about');
});

Importantly, there's no isPending value because there's no mechanism to update that value. If you need to track the pending status of a transition, you should use a hook which has a built-in ability to update the pending state as it changes.

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Comparing: c4e0768...5c11731

react

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Comparing: c4e0768...5c11731

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File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react-jsx-runtime.development.js 0.0% 0.0% 37.29 KB 37.29 KB 10.73 KB 10.73 KB NODE_DEV
react-jsx-runtime.production.min.js 0.0% 🔺+0.2% 971 B 971 B 606 B 607 B NODE_PROD
React-dev.js +0.5% +0.4% 89.68 KB 90.15 KB 21.35 KB 21.45 KB RN_FB_DEV
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React-profiling.js +2.2% +1.1% 17.27 KB 17.66 KB 4.59 KB 4.64 KB RN_FB_PROFILING
react-jsx-dev-runtime.development.js 0.0% 0.0% 36.7 KB 36.7 KB 10.56 KB 10.56 KB NODE_DEV
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React: size: 0.0%, gzip: -0.0%

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@rickhanlonii rickhanlonii force-pushed the rickhanlonii:rh-react-start-transition branch from 379fa48 to a4edbd3 Aug 26, 2020
@rickhanlonii rickhanlonii force-pushed the rickhanlonii:rh-react-start-transition branch from a4edbd3 to 2befdf4 Aug 26, 2020
@rickhanlonii rickhanlonii marked this pull request as ready for review Aug 26, 2020
@rickhanlonii rickhanlonii requested review from acdlite and gaearon and removed request for acdlite Aug 26, 2020
@@ -72,6 +72,7 @@ export {
createFactory,
useTransition,
useTransition as unstable_useTransition,
startTransition as unstable_startTransition,

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@gaearon

gaearon Aug 26, 2020
Member

Does this also need an unprefixed export like others?

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@rickhanlonii

rickhanlonii Aug 26, 2020
Author Member

Nice catch, it doesn't need it but yes it should have it.

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@gaearon gaearon left a comment

lgtm but I don't have all context

@rickhanlonii rickhanlonii merged commit 5564f2c into facebook:master Aug 26, 2020
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@rickhanlonii rickhanlonii deleted the rickhanlonii:rh-react-start-transition branch Aug 26, 2020

export function startTransition(scope: () => void) {
const previousConfig = ReactCurrentBatchConfig.suspense;
ReactCurrentBatchConfig.suspense = IndefiniteTimeoutConfig;

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@acdlite

acdlite Aug 26, 2020
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Nit: Can we rename this to .currentTransition please? To match the convention of the other ref-like things

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I guess it was already like that so it's fine. We can rethink the internal data structure later.

facebook-github-bot added a commit to facebook/react-native that referenced this pull request Oct 27, 2020
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This sync includes the following changes:
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- **[6f62abb58](facebook/react@6f62abb )**: Remove usage of Array#fill ([#20071](facebook/react#20071)) //<Dan Abramov>//
- **[40cfe1f48](facebook/react@40cfe1f )**: Update CHANGELOG.md //<Dan Abramov>//
- **[f021a983a](facebook/react@f021a98 )**: Bump versions for 17 ([#20062](facebook/react#20062)) //<Dan Abramov>//
- **[d1bb4d851](facebook/react@d1bb4d8 )**: Profiler: Include ref callbacks in onCommit duration ([#20060](facebook/react#20060)) //<Brian Vaughn>//
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- **[7b6cac952](facebook/react@7b6cac9 )**: Improved Profiler commit hooks test ([#20053](facebook/react#20053)) //<Brian Vaughn>//
- **[dfb6a4033](facebook/react@dfb6a40 )**: [Fast Refresh] Fix crashes caused by rogue Proxies ([#20030](facebook/react#20030)) ([#20039](facebook/react#20039)) //<Kai Riemann>//
- **[37cb732c5](facebook/react@37cb732 )**: Use bitwise OR to define flag masks ([#20044](facebook/react#20044)) //<Andrew Clark>//
- **[eb3181e77](facebook/react@eb3181e )**: Add Visibility flag for hiding/unhiding trees ([#20043](facebook/react#20043)) //<Andrew Clark>//
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- **[4f3f7eeb7](facebook/react@4f3f7ee )**: Bugfix: Effect clean up when deleting suspended tree ([#19752](facebook/react#19752)) //<Andrew Clark>//
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- **[166544360](facebook/react@1665443 )**: Rename effect fields ([#19755](facebook/react#19755)) //<Andrew Clark>//
- **[708fa77a7](facebook/react@708fa77 )**: Decrease expiration time of input updates ([#19772](facebook/react#19772)) //<Andrew Clark>//
- **[36df483af](facebook/react@36df483 )**: Add feature flag to disable scheduler timeout in work loop ([#19771](facebook/react#19771)) //<Ricky>//
- **[bcc0aa463](facebook/react@bcc0aa4 )**: Revert "Revert "Remove onScroll bubbling flag ([#19535](facebook/react#19535))" ([#19655](facebook/react#19655))" ([#19761](facebook/react#19761)) //<Dan Abramov>//
- **[99cae887f](facebook/react@99cae88 )**: Add failing test for passive effect cleanup functions and memoized components ([#19750](facebook/react#19750)) //<Brian Vaughn>//
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- **[53e622ca7](facebook/react@53e622c )**: Fix instances of function declaration after return ([#19733](facebook/react#19733)) //<Bhumij Gupta>//
- **[b7d18c4da](facebook/react@b7d18c4 )**: Support Babel's envName option in React Refresh plugin ([#19009](facebook/react#19009)) //<Kevin Weber>//
- **[1f38dcff6](facebook/react@1f38dcf )**: Remove withSuspenseConfig ([#19724](facebook/react#19724)) //<Andrew Clark>//
- **[1396e4a8f](facebook/react@1396e4a )**: Fixes eslint warning when node type is ChainExpression ([#19680](facebook/react#19680)) //<Pascal Fong Kye>//
- **[a8500be89](facebook/react@a8500be )**: Add `startTransition` as a known stable method ([#19720](facebook/react#19720)) //<Andrew Clark>//
- **[380dc95de](facebook/react@380dc95 )**: Revert "Append text string to <Text> error message ([#19581](facebook/react#19581))" ([#19723](facebook/react#19723)) //<Timothy Yung>//
- **[ddd1faa19](facebook/react@ddd1faa )**: Remove config argument from useTransition ([#19719](facebook/react#19719)) //<Andrew Clark>//
- **[92fcd46cc](facebook/react@92fcd46 )**: Replace SuspenseConfig object with an integer ([#19706](facebook/react#19706)) //<Andrew Clark>//
- **[b754caaaf](facebook/react@b754caa )**: Enable eager listeners in open source ([#19716](facebook/react#19716)) //<Dan Abramov>//
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- **[1eaafc9ad](facebook/react@1eaafc9 )**: Clean up timeoutMs-related implementation details ([#19704](facebook/react#19704)) //<Andrew Clark>//
- **[8da0da093](facebook/react@8da0da0 )**: Disable timeoutMs argument ([#19703](facebook/react#19703)) //<Andrew Clark>//
- **[60ba723bf](facebook/react@60ba723 )**: Add SuspenseList to devTools ([#19684](facebook/react#19684)) //<Ben Pernick>//
- **[5564f2c95](facebook/react@5564f2c )**: Add React.startTransition ([#19696](facebook/react#19696)) //<Ricky>//
- **[c4e0768d7](facebook/react@c4e0768 )**: Remove unused argument from `finishConcurrentRender` ([#19689](facebook/react#19689)) //<inottn>//
- **[848bb2426](facebook/react@848bb24 )**: Attach Listeners Eagerly to Roots and Portal Containers ([#19659](facebook/react#19659)) //<Dan Abramov>//
- **[d2e914ab4](facebook/react@d2e914a )**: Remove remaining references to effect list ([#19673](facebook/react#19673)) //<Andrew Clark>//
- **[d6e433899](facebook/react@d6e4338 )**: Use Global Render Timeout for CPU Suspense ([#19643](facebook/react#19643)) //<Sebastian Markbåge>//
- **[64ddef44c](facebook/react@64ddef4 )**: Revert "Remove onScroll bubbling flag ([#19535](facebook/react#19535))" ([#19655](facebook/react#19655)) //<Dan Abramov>//
- **[dd651df05](facebook/react@dd651df )**: Keep onTouchStart, onTouchMove, and onWheel passive ([#19654](facebook/react#19654)) //<Dan Abramov>//
- **[b8fa09e9e](facebook/react@b8fa09e )**: provide profiling bundle for react-reconciler ([#19559](facebook/react#19559)) //<Julien Gilli>//
- **[23595ff59](facebook/react@23595ff )**: Add missing param to safelyCallDestroy() ([#19638](facebook/react#19638)) //<Brian Vaughn>//
- **[ee409ea3b](facebook/react@ee409ea )**: change destroy to safelyCallDestroy ([#19605](facebook/react#19605)) //<Luna Ruan>//
- **[bcca5a6ca](facebook/react@bcca5a6 )**: Always skip unmounted/unmounting error boundaries ([#19627](facebook/react#19627)) //<Brian Vaughn>//
- **[1a41a196b](facebook/react@1a41a19 )**: Append text string to <Text> error message ([#19581](facebook/react#19581)) //<Timothy Yung>//
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- **[ced05c46c](facebook/react@ced05c4 )**: Update CHANGELOG.md //<Dan Abramov>//
- **[702fad4b1](facebook/react@702fad4 )**: refactor fb.me redirect link to reactjs.org/link ([#19598](facebook/react#19598)) //<CY Lim>//
- **[49cd77d24](facebook/react@49cd77d )**: fix: leak strict mode with UMD builds ([#19614](facebook/react#19614)) //<Toru Kobayashi>//
- **[ffb749c95](facebook/react@ffb749c )**: Improve error boundary handling for unmounted subtrees ([#19542](facebook/react#19542)) //<Brian Vaughn>//
- **[9b35dd2fc](facebook/react@9b35dd2 )**: Permanently removed component stacks from scheduling profiler data ([#19615](facebook/react#19615)) //<Brian Vaughn>//
- **[3f8115cdd](facebook/react@3f8115c )**: Remove `didTimeout` check from work loop //<Andrew Clark>//
- **[9abc2785c](facebook/react@9abc278 )**: Remove wasteful checks from `shouldYield` //<Andrew Clark>//
- **[1d5e10f70](facebook/react@1d5e10f )**: [eslint-plugin-react-hooks] Report constant constructions ([#19590](facebook/react#19590)) //<Jordan Eldredge>//
- **[dab0854c5](facebook/react@dab0854 )**: Move commit passive unmount/mount to CommitWork ([#19599](facebook/react#19599)) //<Sebastian Markbåge>//
- **[ccb6c3945](facebook/react@ccb6c39 )**: Remove unused argument ([#19600](facebook/react#19600)) //<inottn>//
- **[629125555](facebook/react@6291255 )**: [Scheduler] Re-throw unhandled errors ([#19595](facebook/react#19595)) //<Andrew Clark>//
- **[b8ed6a1aa](facebook/react@b8ed6a1 )**: [Scheduler] Call postTask directly ([#19551](facebook/react#19551)) //<Andrew Clark>//
- **[ce37bfad5](facebook/react@ce37bfa )**: Remove resolutions from test renderer package.json ([#19577](facebook/react#19577)) //<Dan Abramov>//
- **[2704bb537](facebook/react@2704bb5 )**: Add ReactVersion to SchedulingProfiler render scheduled marks ([#19553](facebook/react#19553)) //<Kartik Choudhary>//
- **[0c52e24cb](facebook/react@0c52e24 )**: Support inner component _debugOwner in memo ([#19556](facebook/react#19556)) //<Brian Vaughn>//
- **[0cd9a6de5](facebook/react@0cd9a6d )**: Parallelize Jest in CI ([#19552](facebook/react#19552)) //<Andrew Clark>//
- **[a63893ff3](facebook/react@a63893f )**: Warn about undefined return value for memo and forwardRef ([#19550](facebook/react#19550)) //<Brian Vaughn>//
- **[32ff42868](facebook/react@32ff428 )**: Add feature flag for setting update lane priority ([#19401](facebook/react#19401)) //<Ricky>//
- **[5bdd4c8c6](facebook/react@5bdd4c8 )**: Remove unused argument from call to jest method ([#19546](facebook/react#19546)) //<Gustavo Saiani>//
- **[a5fed98a9](facebook/react@a5fed98 )**: Register more node types that are used later as JSXIdentifiers ([#19514](facebook/react#19514)) //<Mateusz Burzyński>//
- **[f77c7b9d7](facebook/react@f77c7b9 )**: 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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