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Fix ignored setState in Safari when iframe is touched #24459

merged 1 commit into from May 12, 2022


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@gaearon gaearon commented Apr 28, 2022

Fixes #24458.

Just like #22459, this is caused by a Safari bug (

Our original solution for #22459 was #23111: if the microtask callback runs prematurely, we ignore it. This relied on the assumption that we always check for more work at the end of the task anyway. However, we don't check for more work if we aren't either rendering or committing — notably, we don't check for more work at the end of the event handler.

This fix is to allow the update to flush early. This doesn't respect batching but matches what Safari is trying to do (which is to flush everything early).

@gaearon gaearon requested review from sebmarkbage and acdlite Apr 28, 2022
@facebook-github-bot facebook-github-bot added the React Core Team label Apr 28, 2022
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sizebot commented Apr 28, 2022

Comparing: 340060c...b7b40cd

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name +/- Base Current +/- gzip Base gzip Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js = 131.58 kB 131.58 kB = 42.11 kB 42.11 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js = 136.82 kB 136.82 kB = 43.69 kB 43.69 kB
facebook-www/ReactDOM-prod.classic.js = 441.17 kB 441.18 kB = 80.49 kB 80.49 kB
facebook-www/ReactDOM-prod.modern.js = 426.38 kB 426.39 kB = 78.29 kB 78.29 kB
facebook-www/ReactDOMForked-prod.classic.js = 441.17 kB 441.18 kB = 80.49 kB 80.49 kB

Significant size changes

Includes any change greater than 0.2%:

(No significant changes)

Generated by 🚫 dangerJS against b7b40cd

queue.forEach(cb => cb());
queue = [];
flushMicrotasksPrematurely = function() {
while (queue.length > 0) {
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@gaearon gaearon Apr 28, 2022

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This simulates the Safari behavior of trying to drain the queue until it's empty. So that we don't "fix" this by adding an infinite loop.


let busy = true
const callback = () => {
  if (busy) {
    console.error('noo im busy')
  } else {
    console.log('im ok')
console.log("will add iframe");
const iframe = document.createElement("iframe");
iframe.src = "localhost";
console.log("did add iframe");
busy = false

gets Safari infinitely stuck

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gaearon commented May 6, 2022

ping @acdlite

@gaearon gaearon merged commit 2c8a145 into facebook:main May 12, 2022
36 checks passed
@gaearon gaearon deleted the safari-flush-early branch May 12, 2022
facebook-github-bot pushed a commit to facebook/react-native that referenced this issue Jun 6, 2022
This sync includes the following changes:
- **[dd4950c90](facebook/react@dd4950c90 )**: [Flight] Implement useId hook ([#24172](facebook/react#24172)) //<Josh Story>//
- **[26a5b3c7f](facebook/react@26a5b3c7f )**: Explicitly set `highWaterMark` to 0 for `ReadableStream` ([#24641](facebook/react#24641)) //<Josh Larson>//
- **[aec575914](facebook/react@aec575914 )**: [Fizz] Send errors down to client ([#24551](facebook/react#24551)) //<Josh Story>//
- **[a2766387e](facebook/react@a2766387e )**: [Fizz] Improve text separator byte efficiency ([#24630](facebook/react#24630)) //<Josh Story>//
- **[f7860538a](facebook/react@f7860538a )**: Fix typo in useSyncExternalStore main entry point error ([#24631](facebook/react#24631)) //<François Chalifour>//
- **[1bed20731](facebook/react@1bed20731 )**: Add a module map option to the Webpack Flight Client ([#24629](facebook/react#24629)) //<Sebastian Markbåge>//
- **[b2763d3ea](facebook/react@b2763d3ea )**: Move hydration code out of normal Suspense path ([#24532](facebook/react#24532)) //<Andrew Clark>//
- **[357a61324](facebook/react@357a61324 )**: [DevTools][Transition Tracing] Added support for Suspense Boundaries ([#23365](facebook/react#23365)) //<Luna Ruan>//
- **[2c8a1452b](facebook/react@2c8a1452b )**: Fix ignored setState in Safari when iframe is touched ([#24459](facebook/react#24459)) //<dan>//
- **[62662633d](facebook/react@62662633d )**: Remove enableFlipOffscreenUnhideOrder ([#24545](facebook/react#24545)) //<Ricky>//
- **[34da5aa69](facebook/react@34da5aa69 )**: Only treat updates to lazy as a new mount in legacy mode ([#24530](facebook/react#24530)) //<Ricky>//
- **[46a6d77e3](facebook/react@46a6d77e3 )**: Unify JSResourceReference Interfaces ([#24507](facebook/react#24507)) //<Timothy Yung>//
- **[6cbf0f7fa](facebook/react@6cbf0f7fa )**: Fork ReactSymbols ([#24484](facebook/react#24484)) //<Ricky>//
- **[a10a9a6b5](facebook/react@a10a9a6b5 )**: Add test for hiding children after layout destroy ([#24483](facebook/react#24483)) //<Ricky>//
- **[b4eb0ad71](facebook/react@b4eb0ad71 )**: Do not replay erroring beginWork with invokeGuardedCallback when suspended or previously errored ([#24480](facebook/react#24480)) //<Josh Story>//
- **[99eef9e2d](facebook/react@99eef9e2d )**: Hide children of Offscreen after destroy effects ([#24446](facebook/react#24446)) //<Ricky>//
- **[ce1386028](facebook/react@ce1386028 )**: Remove enablePersistentOffscreenHostContainer flag ([#24460](facebook/react#24460)) //<Andrew Clark>//
- **[72b7462fe](facebook/react@72b7462fe )**: Bump local package.json versions for 18.1 release ([#24447](facebook/react#24447)) //<Andrew Clark>//
- **[22edb9f77](facebook/react@22edb9f77 )**: React `version` field should match package.json ([#24445](facebook/react#24445)) //<Andrew Clark>//
- **[6bf3deef5](facebook/react@6bf3deef5 )**: Upgrade react-shallow-renderer to support react 18 ([#24442](facebook/react#24442)) //<Michael サイトー 中村 Bashurov>//

[General][Changed] - React Native sync for revisions bd4784c...d300ceb


Reviewed By: cortinico, kacieb

Differential Revision: D36874368

fbshipit-source-id: c0ee015f4ef2fa56e57f7a1f6bc37dd05c949877
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4 participants