Batch async actions even if useTransition is unmounted #28078

acdlite · 2024-01-24T23:09:18Z

If there are multiple updates inside an async action, they should all be rendered in the same batch, even if they are separate by an async operation (await). We currently implement this by suspending in the useTransition hook to block the update from committing until all possible updates have been scheduled by the action. The reason we did it this way is so you can "cancel" an action by navigating away from the UI that triggered it.

The problem with that approach, though, is that even if you navigate away from the useTransition hook, the action may have updated shared parts of the UI that are still in the tree. So we may need to continue suspending even after the useTransition hook is deleted.

In other words, the lifetime of an async action scope is longer than the lifetime of a particular useTransition hook.

The solution is to suspend whenever any update that is part of the async action scope is unwrapped during render. So, inside useState and useReducer.

This fixes a related issue where an optimistic update is reverted before the async action has finished, because we were relying on the useTransition hook to prevent the optimistic update from finishing.

This also prepares us to support async actions being passed to the non-hook form of startTransition (though this isn't implemented yet).

The error handling path has an invariant that a fiber that errors must have a parent, or else the renderer will panic. This is because the HostRoot fiber is the only fiber without a parent, and the HostRoot is supposed to handle all errors that weren't captured by an inner error boundary. However, this check currently exists in the same path that handles suspending. Unlike errors, we shouldn't panic if the HostRoot suspends; it should behave the same as if a component in the shell suspended. To fix this, I moved the check into an error-handling specific path, so it doesn't affect the Suspense case. We should consider refactoring this a bit more to fork the two paths earlier in the program flow. I didn't add any tests, because there's no (idiomatic) way to trigger this scenario currently, but I'm about to submit a fix for async actions that does.

If there are multiple updates inside an async action, they should all be rendered in the same batch, even if they are separate by an async operation (`await`). We currently implement this by suspending in the `useTransition` hook to block the update from committing until all possible updates have been scheduled by the action. The reason we did it this way is so you can "cancel" an action by navigating away from the UI that triggered it. The problem with that approach, though, is that even if you navigate away from the `useTransition` hook, the action may have updated shared parts of the UI that are still in the tree. So we may need to continue suspending even after the `useTransition` hook is deleted. In other words, the lifetime of an async action scope is longer than the lifetime of a particular `useTransition` hook. The solution is to suspend whenever _any_ update that is part of the async action scope is unwrapped during render. So, inside useState and useReducer. This fixes a related issue where an optimistic update is reverted before the async action has finished, because we were relying on the `useTransition` hook to prevent the optimistic update from finishing. This also prepares us to support async actions being passed to the non-hook form of `startTransition` (though this isn't implemented yet).

This implements the previous fix for class components and root-level updates, too. I put this in its own step because there are some extra changes related to avoiding a context stack mismatch.

react-sizebot · 2024-01-24T23:17:18Z

Comparing: 72411c4...f032dfe

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	+0.06%	176.24 kB	176.34 kB	+0.08%	54.88 kB	54.93 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	+0.06%	178.34 kB	178.44 kB	+0.08%	55.53 kB	55.57 kB
facebook-www/ReactDOM-prod.classic.js	+0.15%	571.94 kB	572.79 kB	+0.24%	100.56 kB	100.80 kB
facebook-www/ReactDOM-prod.modern.js	+0.15%	555.70 kB	556.55 kB	+0.27%	97.62 kB	97.88 kB
test_utils/ReactAllWarnings.js	Deleted	67.55 kB	0.00 kB	Deleted	16.54 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable-semver/react-art/cjs/react-art.production.js	+0.29%	594.91 kB	596.62 kB	+0.42%	132.95 kB	133.51 kB
oss-stable/react-art/cjs/react-art.production.js	+0.29%	594.94 kB	596.65 kB	+0.42%	132.98 kB	133.54 kB
oss-experimental/react-art/cjs/react-art.production.js	+0.28%	602.34 kB	604.06 kB	+0.46%	134.68 kB	135.29 kB
oss-stable-semver/react-test-renderer/cjs/react-test-renderer.production.js	+0.27%	607.49 kB	609.16 kB	+0.42%	135.95 kB	136.52 kB
oss-stable/react-test-renderer/cjs/react-test-renderer.production.js	+0.27%	607.52 kB	609.19 kB	+0.42%	135.98 kB	136.55 kB
oss-experimental/react-test-renderer/cjs/react-test-renderer.production.js	+0.27%	608.92 kB	610.59 kB	+0.42%	136.30 kB	136.87 kB
oss-stable-semver/react-reconciler/cjs/react-reconciler.production.js	+0.25%	686.83 kB	688.55 kB	+0.43%	149.87 kB	150.51 kB
oss-stable/react-reconciler/cjs/react-reconciler.production.js	+0.25%	686.86 kB	688.58 kB	+0.43%	149.90 kB	150.54 kB
oss-experimental/react-reconciler/cjs/react-reconciler.production.js	+0.25%	694.40 kB	696.12 kB	+0.43%	151.55 kB	152.21 kB
react-native/implementations/ReactFabric-dev.js	+0.24%	976.98 kB	979.36 kB	+0.37%	197.10 kB	197.83 kB
react-native/implementations/ReactNativeRenderer-dev.js	+0.24%	993.26 kB	995.65 kB	+0.36%	201.37 kB	202.10 kB
react-native/implementations/ReactFabric-dev.fb.js	+0.24%	1,007.15 kB	1,009.53 kB	+0.34%	202.21 kB	202.89 kB
oss-stable-semver/react-reconciler/cjs/react-reconciler.profiling.js	+0.24%	728.03 kB	729.75 kB	+0.40%	157.23 kB	157.87 kB
oss-stable/react-reconciler/cjs/react-reconciler.profiling.js	+0.24%	728.06 kB	729.78 kB	+0.41%	157.26 kB	157.90 kB
oss-experimental/react-reconciler/cjs/react-reconciler.profiling.js	+0.23%	735.60 kB	737.32 kB	+0.42%	158.94 kB	159.61 kB
react-native/implementations/ReactNativeRenderer-dev.fb.js	+0.23%	1,021.76 kB	1,024.14 kB	+0.34%	206.06 kB	206.76 kB
facebook-www/ReactART-dev.modern.js	+0.20%	1,026.80 kB	1,028.89 kB	+0.29%	202.31 kB	202.89 kB
oss-stable-semver/react-test-renderer/cjs/react-test-renderer.development.js	+0.20%	824.76 kB	826.42 kB	+0.28%	180.87 kB	181.38 kB
oss-stable/react-test-renderer/cjs/react-test-renderer.development.js	+0.20%	824.78 kB	826.44 kB	+0.28%	180.91 kB	181.42 kB
oss-experimental/react-test-renderer/cjs/react-test-renderer.development.js	+0.20%	826.04 kB	827.70 kB	+0.27%	181.17 kB	181.66 kB
facebook-www/ReactART-dev.classic.js	+0.20%	1,039.40 kB	1,041.48 kB	+0.30%	204.69 kB	205.31 kB
facebook-react-native/react-test-renderer/cjs/ReactTestRenderer-prod.js	=	314.05 kB	313.42 kB	=	55.55 kB	55.46 kB
facebook-react-native/react-test-renderer/cjs/ReactTestRenderer-profiling.js	=	330.02 kB	329.32 kB	=	57.98 kB	57.91 kB
react-native/implementations/ReactNativeRenderer-profiling.fb.js	=	365.35 kB	364.43 kB	=	64.22 kB	63.96 kB
react-native/implementations/ReactNativeRenderer-prod.fb.js	=	338.03 kB	337.17 kB	=	60.02 kB	59.74 kB
react-native/implementations/ReactNativeRenderer-prod.js	=	332.22 kB	331.36 kB	=	58.72 kB	58.45 kB
react-native/implementations/ReactFabric-profiling.fb.js	=	357.82 kB	356.89 kB	=	62.76 kB	62.56 kB
react-native/implementations/ReactNativeRenderer-profiling.js	=	351.72 kB	350.79 kB	=	61.88 kB	61.62 kB
react-native/implementations/ReactFabric-prod.fb.js	=	330.55 kB	329.65 kB	=	58.62 kB	58.39 kB
react-native/implementations/ReactFabric-profiling.js	=	342.54 kB	341.61 kB	=	60.13 kB	59.93 kB
react-native/implementations/ReactFabric-prod.js	=	323.06 kB	322.16 kB	=	57.00 kB	56.77 kB
test_utils/ReactAllWarnings.js	Deleted	67.55 kB	0.00 kB	Deleted	16.54 kB	0.00 kB

Generated by 🚫 dangerJS against f032dfe

If there are multiple updates inside an async action, they should all be rendered in the same batch, even if they are separate by an async operation (`await`). We currently implement this by suspending in the `useTransition` hook to block the update from committing until all possible updates have been scheduled by the action. The reason we did it this way is so you can "cancel" an action by navigating away from the UI that triggered it. The problem with that approach, though, is that even if you navigate away from the `useTransition` hook, the action may have updated shared parts of the UI that are still in the tree. So we may need to continue suspending even after the `useTransition` hook is deleted. In other words, the lifetime of an async action scope is longer than the lifetime of a particular `useTransition` hook. The solution is to suspend whenever _any_ update that is part of the async action scope is unwrapped during render. So, inside useState and useReducer. This fixes a related issue where an optimistic update is reverted before the async action has finished, because we were relying on the `useTransition` hook to prevent the optimistic update from finishing. This also prepares us to support async actions being passed to the non-hook form of `startTransition` (though this isn't implemented yet). DiffTrain build for [11c9fd0](11c9fd0)

If there are multiple updates inside an async action, they should all be rendered in the same batch, even if they are separate by an async operation (`await`). We currently implement this by suspending in the `useTransition` hook to block the update from committing until all possible updates have been scheduled by the action. The reason we did it this way is so you can "cancel" an action by navigating away from the UI that triggered it. The problem with that approach, though, is that even if you navigate away from the `useTransition` hook, the action may have updated shared parts of the UI that are still in the tree. So we may need to continue suspending even after the `useTransition` hook is deleted. In other words, the lifetime of an async action scope is longer than the lifetime of a particular `useTransition` hook. The solution is to suspend whenever _any_ update that is part of the async action scope is unwrapped during render. So, inside useState and useReducer. This fixes a related issue where an optimistic update is reverted before the async action has finished, because we were relying on the `useTransition` hook to prevent the optimistic update from finishing. This also prepares us to support async actions being passed to the non-hook form of `startTransition` (though this isn't implemented yet).

If there are multiple updates inside an async action, they should all be rendered in the same batch, even if they are separate by an async operation (`await`). We currently implement this by suspending in the `useTransition` hook to block the update from committing until all possible updates have been scheduled by the action. The reason we did it this way is so you can "cancel" an action by navigating away from the UI that triggered it. The problem with that approach, though, is that even if you navigate away from the `useTransition` hook, the action may have updated shared parts of the UI that are still in the tree. So we may need to continue suspending even after the `useTransition` hook is deleted. In other words, the lifetime of an async action scope is longer than the lifetime of a particular `useTransition` hook. The solution is to suspend whenever _any_ update that is part of the async action scope is unwrapped during render. So, inside useState and useReducer. This fixes a related issue where an optimistic update is reverted before the async action has finished, because we were relying on the `useTransition` hook to prevent the optimistic update from finishing. This also prepares us to support async actions being passed to the non-hook form of `startTransition` (though this isn't implemented yet). DiffTrain build for commit 11c9fd0.

![snyk-top-banner](https://res.cloudinary.com/snyk/image/upload/r-d/scm-platform/snyk-pull-requests/pr-banner-default.svg) <h3>Snyk has created this PR to upgrade react from 19.0.0 to 19.1.0.</h3> :information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project. <hr/> - The recommended version is **78 versions** ahead of your current version. - The recommended version was released **22 days ago**. <details> <summary><b>Release notes</b></summary> <br/> <details> <summary>Package name: <b>react</b></summary> <ul> <li> <b>19.1.0</b> - <a href="https://redirect.github.com/facebook/react/releases/tag/v19.1.0">2025-03-28</a></br><h3>Owner Stack</h3> <p>An Owner Stack is a string representing the components that are directly responsible for rendering a particular component. You can log Owner Stacks when debugging or use Owner Stacks to enhance error overlays or other development tools. Owner Stacks are only available in development builds. Component Stacks in production are unchanged.</p> <ul> <li>An Owner Stack is a development-only stack trace that helps identify which components are responsible for rendering a particular component. An Owner Stack is distinct from a Component Stacks, which shows the hierarchy of components leading to an error.</li> <li>The <a href="https://react.dev/reference/react/captureOwnerStack" rel="nofollow">captureOwnerStack API</a> is only available in development mode and returns a Owner Stack, if available. The API can be used to enhance error overlays or log component relationships when debugging. <a href="https://redirect.github.com/facebook/react/pull/29923" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/29923/hovercard">#29923</a>, <a href="https://redirect.github.com/facebook/react/pull/32353" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32353/hovercard">#32353</a>, <a href="https://redirect.github.com/facebook/react/pull/30306" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/30306/hovercard">#30306</a>,<br> <a href="https://redirect.github.com/facebook/react/pull/32538" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32538/hovercard">#32538</a>, <a href="https://redirect.github.com/facebook/react/pull/32529" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32529/hovercard">#32529</a>, <a href="https://redirect.github.com/facebook/react/pull/32538" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32538/hovercard">#32538</a></li> </ul> <h3>React</h3> <ul> <li>Enhanced support for Suspense boundaries to be used anywhere, including the client, server, and during hydration. <a href="https://redirect.github.com/facebook/react/pull/32069" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32069/hovercard">#32069</a>, <a href="https://redirect.github.com/facebook/react/pull/32163" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32163/hovercard">#32163</a>, <a href="https://redirect.github.com/facebook/react/pull/32224" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32224/hovercard">#32224</a>, <a href="https://redirect.github.com/facebook/react/pull/32252" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32252/hovercard">#32252</a></li> <li>Reduced unnecessary client rendering through improved hydration scheduling <a href="https://redirect.github.com/facebook/react/pull/31751" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31751/hovercard">#31751</a></li> <li>Increased priority of client rendered Suspense boundaries <a href="https://redirect.github.com/facebook/react/pull/31776" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31776/hovercard">#31776</a></li> <li>Fixed frozen fallback states by rendering unfinished Suspense boundaries on the client. <a href="https://redirect.github.com/facebook/react/pull/31620" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31620/hovercard">#31620</a></li> <li>Reduced garbage collection pressure by improving Suspense boundary retries. <a href="https://redirect.github.com/facebook/react/pull/31667" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31667/hovercard">#31667</a></li> <li>Fixed erroneous “Waiting for Paint” log when the passive effect phase was not delayed <a href="https://redirect.github.com/facebook/react/pull/31526" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31526/hovercard">#31526</a></li> <li>Fixed a regression causing key warnings for flattened positional children in development mode. <a href="https://redirect.github.com/facebook/react/pull/32117" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32117/hovercard">#32117</a></li> <li>Updated <code>useId</code> to use valid CSS selectors, changing format from <code>:r123:</code> to <code>«r123»</code>. <a href="https://redirect.github.com/facebook/react/pull/32001" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32001/hovercard">#32001</a></li> <li>Added a dev-only warning for null/undefined created in useEffect, useInsertionEffect, and useLayoutEffect. <a href="https://redirect.github.com/facebook/react/pull/32355" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32355/hovercard">#32355</a></li> <li>Fixed a bug where dev-only methods were exported in production builds. React.act is no longer available in production builds. <a href="https://redirect.github.com/facebook/react/pull/32200" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32200/hovercard">#32200</a></li> <li>Improved consistency across prod and dev to improve compatibility with Google Closure Complier and bindings <a href="https://redirect.github.com/facebook/react/pull/31808" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31808/hovercard">#31808</a></li> <li>Improve passive effect scheduling for consistent task yielding. <a href="https://redirect.github.com/facebook/react/pull/31785" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31785/hovercard">#31785</a></li> <li>Fixed asserts in React Native when passChildrenWhenCloningPersistedNodes is enabled for OffscreenComponent rendering. <a href="https://redirect.github.com/facebook/react/pull/32528" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32528/hovercard">#32528</a></li> <li>Fixed component name resolution for Portal <a href="https://redirect.github.com/facebook/react/pull/32640" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32640/hovercard">#32640</a></li> <li>Added support for beforetoggle and toggle events on the dialog element. <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2882132160" data-permission-text="Title is private" data-url="https://github.com/facebook/react/issues/32479" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32479/hovercard" href="https://redirect.github.com/facebook/react/pull/32479">#32479</a> <a href="https://redirect.github.com/facebook/react/pull/32479" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32479/hovercard">#32479</a></li> </ul> <h3>React DOM</h3> <ul> <li>Fixed double warning when the <code>href</code> attribute is an empty string <a href="https://redirect.github.com/facebook/react/pull/31783" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31783/hovercard">#31783</a></li> <li>Fixed an edge case where <code>getHoistableRoot()</code> didn’t work properly when the container was a Document <a href="https://redirect.github.com/facebook/react/pull/32321" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32321/hovercard">#32321</a></li> <li>Removed support for using HTML comments (e.g. <code></code>) as a DOM container. <a href="https://redirect.github.com/facebook/react/pull/32250" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32250/hovercard">#32250</a></li> <li>Added support for <code><script></code> and <code><template></code> tags to be nested within <code><select></code> tags. <a href="https://redirect.github.com/facebook/react/pull/31837" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31837/hovercard">#31837</a></li> <li>Fixed responsive images to be preloaded as HTML instead of headers <a href="https://redirect.github.com/facebook/react/pull/32445" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32445/hovercard">#32445</a></li> </ul> <h3>use-sync-external-store</h3> <ul> <li>Added <code>exports</code> field to <code>package.json</code> for <code>use-sync-external-store</code> to support various entrypoints. <a href="https://redirect.github.com/facebook/react/pull/25231" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25231/hovercard">#25231</a></li> </ul> <h3>React Server Components</h3> <ul> <li>Added <code>unstable_prerender</code>, a new experimental API for prerendering React Server Components on the server <a href="https://redirect.github.com/facebook/react/pull/31724" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31724/hovercard">#31724</a></li> <li>Fixed an issue where streams would hang when receiving new chunks after a global error <a href="https://redirect.github.com/facebook/react/pull/31840" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31840/hovercard">#31840</a>, <a href="https://redirect.github.com/facebook/react/pull/31851" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31851/hovercard">#31851</a></li> <li>Fixed an issue where pending chunks were counted twice. <a href="https://redirect.github.com/facebook/react/pull/31833" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31833/hovercard">#31833</a></li> <li>Added support for streaming in edge environments <a href="https://redirect.github.com/facebook/react/pull/31852" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31852/hovercard">#31852</a></li> <li>Added support for sending custom error names from a server so that they are available in the client for console replaying. <a href="https://redirect.github.com/facebook/react/pull/32116" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32116/hovercard">#32116</a></li> <li>Updated the server component wire format to remove IDs for hints and console.log because they have no return value <a href="https://redirect.github.com/facebook/react/pull/31671" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31671/hovercard">#31671</a></li> <li>Exposed <code>registerServerReference</code> in client builds to handle server references in different environments. <a href="https://redirect.github.com/facebook/react/pull/32534" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32534/hovercard">#32534</a></li> <li>Added react-server-dom-parcel package which integrates Server Components with the <a href="https://parceljs.org/" rel="nofollow">Parcel bundler</a> <a href="https://redirect.github.com/facebook/react/pull/31725" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31725/hovercard">#31725</a>, <a href="https://redirect.github.com/facebook/react/pull/32132" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32132/hovercard">#32132</a>, <a href="https://redirect.github.com/facebook/react/pull/31799" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31799/hovercard">#31799</a>, <a href="https://redirect.github.com/facebook/react/pull/32294" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/32294/hovercard">#32294</a>, <a href="https://redirect.github.com/facebook/react/pull/31741" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31741/hovercard">#31741</a></li> </ul> </li> <li> <b>19.1.0-canary-ff628334-20250205</b> - 2025-02-06 </li> <li> <b>19.1.0-canary-fcb4e0f1-20250219</b> - 2025-02-20 </li> <li> <b>19.1.0-canary-fc8a898d-20241226</b> - 2024-12-27 </li> <li> <b>19.1.0-canary-fbcda19a-20250317</b> - 2025-03-17 </li> <li> <b>19.1.0-canary-f9d78089-20250306</b> - 2025-03-07 </li> <li> <b>19.1.0-canary-f83903bf-20250212</b> - 2025-02-12 </li> <li> <b>19.1.0-canary-f457d0b4-20250313</b> - 2025-03-13 </li> <li> <b>19.1.0-canary-f0edf41e-20250115</b> - 2025-01-14 </li> <li> <b>19.1.0-canary-ef979d47-20241218</b> - 2024-12-18 </li> <li> <b>19.1.0-canary-ef4bc8b4-20250328</b> - 2025-03-28 </li> <li> <b>19.1.0-canary-ebc22ef7-20250225</b> - 2025-02-26 </li> <li> <b>19.1.0-canary-e670e72f-20250214</b> - 2025-02-14 </li> <li> <b>19.1.0-canary-e1e74071-20250321</b> - 2025-03-21 </li> <li> <b>19.1.0-canary-e06c72fc-20241215</b> - 2024-12-16 </li> <li> <b>19.1.0-canary-e03ac20f-20250305</b> - 2025-03-05 </li> <li> <b>19.1.0-canary-de82912e-20241220</b> - 2024-12-20 </li> <li> <b>19.1.0-canary-de1eaa26-20250124</b> - 2025-01-24 </li> <li> <b>19.1.0-canary-db7dfe05-20250319</b> - 2025-03-19 </li> <li> <b>19.1.0-canary-d85cf3e5-20250205</b> - 2025-02-05 </li> <li> <b>19.1.0-canary-d55cc79b-20250228</b> - 2025-02-28 </li> <li> <b>19.1.0-canary-d46b04a2-20250117</b> - 2025-01-17 </li> <li> <b>19.1.0-canary-d4287258-20241217</b> - 2024-12-17 </li> <li> <b>19.1.0-canary-d331ba04-20250307</b> - 2025-03-10 </li> <li> <b>19.1.0-canary-cd90a4d8-20250210</b> - 2025-02-11 </li> <li> <b>19.1.0-canary-cbbe8666-20250213</b> - 2025-02-13 </li> <li> <b>19.1.0-canary-cabd8a0e-20250113</b> - 2025-01-13 </li> <li> <b>19.1.0-canary-c69a5fc5-20250318</b> - 2025-03-18 </li> <li> <b>19.1.0-canary-c492f975-20250128</b> - 2025-01-29 </li> <li> <b>19.1.0-canary-c01b8058-20241229</b> - 2024-12-30 </li> <li> <b>19.1.0-canary-bb9a24d9-20250130</b> - 2025-01-30 </li> <li> <b>19.1.0-canary-b3a95caf-20250113</b> - 2025-01-14 </li> <li> <b>19.1.0-canary-b158439a-20250115</b> - 2025-01-15 </li> <li> <b>19.1.0-canary-ae9017ce-20250122</b> - 2025-01-23 </li> <li> <b>19.1.0-canary-a84862db-20250218</b> - 2025-02-19 </li> <li> <b>19.1.0-canary-a4f9bd58-20250319</b> - 2025-03-20 </li> <li> <b>19.1.0-canary-a4b2d0d5-20250203</b> - 2025-02-03 </li> <li> <b>19.1.0-canary-9ff42a87-20250130</b> - 2025-01-31 </li> <li> <b>19.1.0-canary-9eabb373-20250124</b> - 2025-01-27 </li> <li> <b>19.1.0-canary-9b62ee71-20250122</b> - 2025-01-22 </li> <li> <b>19.1.0-canary-97d79495-20241223</b> - 2024-12-24 </li> <li> <b>19.1.0-canary-9463d51e-20241219</b> - 2024-12-19 </li> <li> <b>19.1.0-canary-93b58361-20250209</b> - 2025-02-10 </li> <li> <b>19.1.0-canary-8a7b487e-20250218</b> - 2025-02-18 </li> <li> <b>19.1.0-canary-8759c5c8-20250207</b> - 2025-02-07 </li> <li> <b>19.1.0-canary-7eb8234f-20241218</b> - 2024-12-18 </li> <li> <b>19.1.0-canary-7b402084-20250107</b> - 2025-01-07 </li> <li> <b>19.1.0-canary-74ea0c73-20250109</b> - 2025-01-09 </li> <li> <b>19.1.0-canary-740a4f7a-20250325</b> - 2025-03-25 </li> <li> <b>19.1.0-canary-7130d0c6-20241212</b> - 2024-12-12 </li> <li> <b>19.1.0-canary-6aa8254b-20250312</b> - 2025-03-12 </li> <li> <b>19.1.0-canary-694d3e1a-20241231</b> - 2025-01-01 </li> <li> <b>19.1.0-canary-6907aa2a-20241220</b> - 2024-12-23 </li> <li> <b>19.1.0-canary-662957cc-20250221</b> - 2025-02-21 </li> <li> <b>19.1.0-canary-62208bee-20250102</b> - 2025-01-02 </li> <li> <b>19.1.0-canary-5b51a2b9-20250116</b> - 2025-01-16 </li> <li> <b>19.1.0-canary-540efebc-20250112</b> - 2025-01-12 </li> <li> <b>19.1.0-canary-5398b711-20250314</b> - 2025-03-14 </li> <li> <b>19.1.0-canary-518d06d2-20241219</b> - 2024-12-19 </li> <li> <b>19.1.0-canary-4dff0e62-20241213</b> - 2024-12-13 </li> <li> <b>19.1.0-canary-4632e36a-20250216</b> - 2025-02-17 </li> <li> <b>19.1.0-canary-443b7ff2-20250303</b> - 2025-03-04 </li> <li> <b>19.1.0-canary-4280563b-20250326</b> - 2025-03-27 </li> <li> <b>19.1.0-canary-42687267-20250108</b> - 2025-01-08 </li> <li> <b>19.1.0-canary-3ce77d55-20250106</b> - 2025-01-06 </li> <li> <b>19.1.0-canary-3b009b4c-20250102</b> - 2025-01-03 </li> <li> <b>19.1.0-canary-37906d4d-20250127</b> - 2025-01-28 </li> <li> <b>19.1.0-canary-32b0cad8-20250213</b> - 2025-02-13 </li> <li> <b>19.1.0-canary-313332d1-20250326</b> - 2025-03-26 </li> <li> <b>19.1.0-canary-2980f277-20250301</b> - 2025-03-03 </li> <li> <b>19.1.0-canary-25677265-20250224</b> - 2025-02-24 </li> <li> <b>19.1.0-canary-22e39ea7-20250225</b> - 2025-02-25 </li> <li> <b>19.1.0-canary-18eaf51b-20250118</b> - 2025-01-20 </li> <li> <b>19.1.0-canary-130095f7-20241212</b> - 2024-12-12 </li> <li> <b>19.1.0-canary-0ca3deeb-20250311</b> - 2025-03-11 </li> <li> <b>19.1.0-canary-0a82580b-20250203</b> - 2025-02-04 </li> <li> <b>19.1.0-canary-056073de-20250109</b> - 2025-01-10 </li> <li> <b>19.1.0-canary-029e8bd6-20250306</b> - 2025-03-06 </li> <li> <b>19.0.0</b> - <a href="https://redirect.github.com/facebook/react/releases/tag/v19.0.0">2024-12-05</a></br><p>Below is a list of all new features, APIs, deprecations, and breaking changes. Read <a href="https://react.dev/blog/2024/04/25/react-19" rel="nofollow">React 19 release post</a> and <a href="https://react.dev/blog/2024/04/25/react-19-upgrade-guide" rel="nofollow">React 19 upgrade guide</a> for more information.</p> <blockquote> <p>Note: To help make the upgrade to React 19 easier, we’ve published a react@18.3 release that is identical to 18.2 but adds warnings for deprecated APIs and other changes that are needed for React 19. We recommend upgrading to React 18.3.1 first to help identify any issues before upgrading to React 19.</p> </blockquote> <h2>New Features</h2> <h3>React</h3> <ul> <li>Actions: <code>startTransition</code> can now accept async functions. Functions passed to <code>startTransition</code> are called “Actions”. A given Transition can include one or more Actions which update state in the background and update the UI with one commit. In addition to updating state, Actions can now perform side effects including async requests, and the Action will wait for the work to finish before finishing the Transition. This feature allows Transitions to include side effects like <code>fetch()</code> in the pending state, and provides support for error handling, and optimistic updates.</li> <li><code>useActionState</code>: is a new hook to order Actions inside of a Transition with access to the state of the action, and the pending state. It accepts a reducer that can call Actions, and the initial state used for first render. It also accepts an optional string that is used if the action is passed to a form <code>action</code> prop to support progressive enhancement in forms.</li> <li><code>useOptimistic</code>: is a new hook to update state while a Transition is in progress. It returns the state, and a set function that can be called inside a transition to “optimistically” update the state to expected final value immediately while the Transition completes in the background. When the transition finishes, the state is updated to the new value.</li> <li><code>use</code>: is a new API that allows reading resources in render. In React 19, <code>use</code> accepts a promise or Context. If provided a promise, <code>use</code> will suspend until a value is resolved. <code>use</code> can only be used in render but can be called conditionally.</li> <li><code>ref</code> as a prop: Refs can now be used as props, removing the need for <code>forwardRef</code>.</li> <li><strong>Suspense sibling pre-warming</strong>: When a component suspends, React will immediately commit the fallback of the nearest Suspense boundary, without waiting for the entire sibling tree to render. After the fallback commits, React will schedule another render for the suspended siblings to “pre-warm” lazy requests.</li> </ul> <h3>React DOM Client</h3> <ul> <li><code><form> action</code> prop: Form Actions allow you to manage forms automatically and integrate with <code>useFormStatus</code>. When a <code><form> action</code> succeeds, React will automatically reset the form for uncontrolled components. The form can be reset manually with the new <code>requestFormReset</code> API.</li> <li><code><button> and <input> formAction</code> prop: Actions can be passed to the <code>formAction</code> prop to configure form submission behavior. This allows using different Actions depending on the input.</li> <li><code>useFormStatus</code>: is a new hook that provides the status of the parent <code><form> action</code>, as if the form was a Context provider. The hook returns the values: <code>pending</code>, <code>data</code>, <code>method</code>, and <code>action</code>.</li> <li>Support for Document Metadata: We’ve added support for rendering document metadata tags in components natively. React will automatically hoist them into the <code><head></code> section of the document.</li> <li>Support for Stylesheets: React 19 will ensure stylesheets are inserted into the <code><head></code> on the client before revealing the content of a Suspense boundary that depends on that stylesheet.</li> <li>Support for async scripts: Async scripts can be rendered anywhere in the component tree and React will handle ordering and deduplication.</li> <li>Support for preloading resources: React 19 ships with <code>preinit</code>, <code>preload</code>, <code>prefetchDNS</code>, and <code>preconnect</code> APIs to optimize initial page loads by moving discovery of additional resources like fonts out of stylesheet loading. They can also be used to prefetch resources used by an anticipated navigation.</li> </ul> <h3>React DOM Server</h3> <ul> <li>Added <code>prerender</code> and <code>prerenderToNodeStream</code> APIs for static site generation. They are designed to work with streaming environments like Node.js Streams and Web Streams. Unlike <code>renderToString</code>, they wait for data to load for HTML generation.</li> </ul> <h3>React Server Components</h3> <ul> <li>RSC features such as directives, server components, and server functions are now stable. This means libraries that ship with Server Components can now target React 19 as a peer dependency with a react-server export condition for use in frameworks that support the Full-stack React Architecture. The underlying APIs used to implement a React Server Components bundler or framework do not follow semver and may break between minors in React 19.x. See <a href="https://19.react.dev/reference/rsc/server-components" rel="nofollow">docs</a> for how to support React Server Components.</li> </ul> <h2>Deprecations</h2> <ul> <li>Deprecated: <code>element.ref</code> access: React 19 supports ref as a prop, so we’re deprecating <code>element.ref</code> in favor of <code>element.props.ref</code>. Accessing will result in a warning.</li> <li><code>react-test-renderer</code>: In React 19, react-test-renderer logs a deprecation warning and has switched to concurrent rendering for web usage. We recommend migrating your tests to @ testinglibrary.com/docs/react-testing-library/intro/) or @ testingesting-library.com/docs/react-native-testing-library/intro)</li> </ul> <h2>Breaking Changes</h2> <p>React 19 brings in a number of breaking changes, including the removals of long-deprecated APIs. We recommend first upgrading to <code>18.3.1</code>, where we've added additional deprecation warnings. Check out the <a href="https://19.react.dev/blog/2024/04/25/react-19-upgrade-guide" rel="nofollow">upgrade guide</a> for more details and guidance on codemodding.</p> <h3>React</h3> <ul> <li>New JSX Transform is now required: We introduced <a href="https://legacy.reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html" rel="nofollow">a new JSX transform</a> in 2020 to improve bundle size and use JSX without importing React. In React 19, we’re adding additional improvements like using ref as a prop and JSX speed improvements that require the new transform.</li> <li>Errors in render are not re-thrown: Errors that are not caught by an Error Boundary are now reported to window.reportError. Errors that are caught by an Error Boundary are reported to console.error. We’ve introduced <code>onUncaughtError</code> and <code>onCaughtError</code> methods to <code>createRoot</code> and <code>hydrateRoot</code> to customize this error handling.</li> <li>Removed: <code>propTypes</code>: Using <code>propTypes</code> will now be silently ignored. If required, we recommend migrating to TypeScript or another type-checking solution.</li> <li>Removed: <code>defaultProps</code> for functions: ES6 default parameters can be used in place. Class components continue to support <code>defaultProps</code> since there is no ES6 alternative.</li> <li>Removed: <code>contextTypes</code> and <code>getChildContext</code>: Legacy Context for class components has been removed in favor of the <code>contextType</code> API.</li> <li>Removed: string refs: Any usage of string refs need to be migrated to ref callbacks.</li> <li>Removed: Module pattern factories: A rarely used pattern that can be migrated to regular functions.</li> <li>Removed: <code>React.createFactory</code>: Now that JSX is broadly supported, all <code>createFactory</code> usage can be migrated to JSX components.</li> <li>Removed: <code>react-test-renderer/shallow</code>: This has been a re-export of <a href="https://redirect.github.com/enzymejs/react-shallow-renderer">react-shallow-renderer</a> since React 18. If needed, you can continue to use the third-party package directly. We recommend using @ testinglibrary.com/docs/react-testing-library/intro/) or @ testingesting-library.com/docs/react-native-testing-library/intro) instead.</li> </ul> <h3>React DOM</h3> <ul> <li>Removed: <code>react-dom/test-utils</code>: We’ve moved <code>act</code> from <code>react-dom/test-utils</code> to react. All other utilities have been removed.</li> <li>Removed: <code>ReactDOM</code>.<code>render</code>, <code>ReactDOM</code>.<code>hydrate</code>: These have been removed in favor of the concurrent equivalents: <code>ReactDOM</code>.<code>createRoot</code> and <code>ReactDOM.hydrateRoot</code>.</li> <li>Removed: <code>unmountComponentAtNode</code>: Removed in favor of <code>root.unmount()</code>.</li> <li>Removed: <code>ReactDOM</code>.<code>findDOMNode</code>: You can replace <code>ReactDOM</code>.<code>findDOMNode</code> with DOM Refs.</li> </ul> <h2>Notable Changes</h2> <h3>React</h3> <ul> <li><code><Context></code> as a provider: You can now render <code><Context></code> as a provider instead of <code><Context.Provider></code>.</li> <li>Cleanup functions for refs: When the component unmounts, React will call the cleanup function returned from the ref callback.</li> <li><code>useDeferredValue</code> initial value argument: When provided, <code>useDeferredValue</code> will return the initial value for the initial render of a component, then schedule a re-render in the background with the <code>deferredValue</code> returned.</li> <li>Support for Custom Elements: React 19 now passes all tests on <a href="https://custom-elements-everywhere.com/" rel="nofollow">Custom Elements Everywhere</a>.</li> <li>StrictMode changes: <code>useMemo</code> and <code>useCallback</code> will now reuse the memoized results from the first render, during the second render. Additionally, StrictMode will now double-invoke ref callback functions on initial mount.</li> <li>UMD builds removed: To load React 19 with a script tag, we recommend using an ESM-based CDN such as <a href="http://esm.sh" rel="nofollow">esm.sh</a>.</li> </ul> <h3>React DOM</h3> <ul> <li>Diffs for hydration errors: In the case of a mismatch, React 19 logs a single error with a diff of the mismatched content.</li> <li>Compatibility with third-party scripts and extensions: React will now force a client re-render to fix up any mismatched content caused by elements inserted by third-party JS.</li> </ul> <h2>TypeScript Changes</h2> <p>The most common changes can be codemodded with <code>npx types-react-codemod@latest preset-19 ./path-to-your-react-ts-files</code>.</p> <ul> <li>Removed deprecated TypeScript types: <ul> <li><code>ReactChild</code> (replacement: <code>React.ReactElement | number | string)</code></li> <li><code>ReactFragment</code> (replacement: <code>Iterable<React.ReactNode></code>)</li> <li><code>ReactNodeArray</code> (replacement: <code>ReadonlyArray<React.ReactNode></code>)</li> <li><code>ReactText</code> (replacement: <code>number | string</code>)</li> <li><code>VoidFunctionComponent</code> (replacement: <code>FunctionComponent</code>)</li> <li><code>VFC</code> (replacement: <code>FC</code>)</li> <li>Moved to <code>prop-types</code>: <code>Requireable</code>, <code>ValidationMap</code>, <code>Validator</code>, <code>WeakValidationMap</code></li> <li>Moved to <code>create-react-class</code>: <code>ClassicComponentClass</code>, <code>ClassicComponent</code>, <code>ClassicElement</code>, <code>ComponentSpec</code>, <code>Mixin</code>, <code>ReactChildren</code>, <code>ReactHTML</code>, <code>ReactSVG</code>, <code>SFCFactory</code></li> </ul> </li> <li>Disallow implicit return in refs: refs can now accept cleanup functions. When you return something else, we can’t tell if you intentionally returned something not meant to clean up or returned the wrong value. Implicit returns of anything but functions will now error.</li> <li>Require initial argument to <code>useRef</code>: The initial argument is now required to match <code>useState</code>, <code>createContext</code> etc</li> <li>Refs are mutable by default: Ref objects returned from <code>useRef()</code> are now always mutable instead of sometimes being immutable. This feature was too confusing for users and conflicted with legit cases where refs were managed by React and manually written to.</li> <li>Strict <code>ReactElement</code> typing: The props of React elements now default to <code>unknown</code> instead of <code>any</code> if the element is typed as <code>ReactElement</code></li> <li>JSX namespace in TypeScript: The global <code>JSX</code> namespace is removed to improve interoperability with other libraries using JSX. Instead, the JSX namespace is available from the React package: <code>import { JSX } from 'react'</code></li> <li>Better <code>useReducer</code> typings: Most <code>useReducer</code> usage should not require explicit type arguments.<br> For example, <div class="highlight highlight-source-diff notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="-useReducer<React.Reducer<State, Action>>(reducer) +useReducer(reducer) "><pre><span class="pl-md"><span class="pl-md">-</span>useReducer<React.Reducer<State, Action>>(reducer) </span> <span class="pl-mi1"><span class="pl-mi1">+</span>useReducer(reducer) </span></pre></div> or <div class="highlight highlight-source-diff notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="-useReducer<React.Reducer<State, Action>>(reducer) +useReducer<State, [Action]>(reducer)"><pre><span class="pl-md"><span class="pl-md">-</span>useReducer<React.Reducer<State, Action>>(reducer) </span> <span class="pl-mi1"><span class="pl-mi1">+</span>useReducer<State, [Action]>(reducer)</span></pre></div> </li> </ul> <h2>All Changes</h2> <h3>React</h3> <ul> <li>Add support for async Actions (<a href="https://redirect.github.com/facebook/react/pull/26621" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26621/hovercard">#26621</a>, <a href="https://redirect.github.com/facebook/react/pull/26726" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26726/hovercard">#26726</a>, <a href="https://redirect.github.com/facebook/react/pull/28078" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28078/hovercard">#28078</a>, <a href="https://redirect.github.com/facebook/react/pull/28097" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28097/hovercard">#28097</a>, <a href="https://redirect.github.com/facebook/react/pull/29226" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/29226/hovercard">#29226</a>, <a href="https://redirect.github.com/facebook/react/pull/29618" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/29618/hovercard">#29618</a>, <a href="https://redirect.github.com/facebook/react/pull/29670" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/29670/hovercard">#29670</a>, <a href="https://redirect.github.com/facebook/react/pull/26716" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26716/hovercard">#26716</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a> and <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sebmarkbage/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sebmarkbage">@ sebmarkbage</a>)</li> <li>Add <code>useActionState()</code> hook to update state based on the result of a Form Action (<a href="https://redirect.github.com/facebook/react/pull/27270" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27270/hovercard">#27270</a>, <a href="https://redirect.github.com/facebook/react/pull/27278" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27278/hovercard">#27278</a>, <a href="https://redirect.github.com/facebook/react/pull/27309" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27309/hovercard">#27309</a>, <a href="https://redirect.github.com/facebook/react/pull/27302" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27302/hovercard">#27302</a>, <a href="https://redirect.github.com/facebook/react/pull/27307" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27307/hovercard">#27307</a>, <a href="https://redirect.github.com/facebook/react/pull/27366" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27366/hovercard">#27366</a>, <a href="https://redirect.github.com/facebook/react/pull/27370" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27370/hovercard">#27370</a>, <a href="https://redirect.github.com/facebook/react/pull/27321" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27321/hovercard">#27321</a>, <a href="https://redirect.github.com/facebook/react/pull/27374" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27374/hovercard">#27374</a>, <a href="https://redirect.github.com/facebook/react/pull/27372" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27372/hovercard">#27372</a>, <a href="https://redirect.github.com/facebook/react/pull/27397" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27397/hovercard">#27397</a>, <a href="https://redirect.github.com/facebook/react/pull/27399" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27399/hovercard">#27399</a>, <a href="https://redirect.github.com/facebook/react/pull/27460" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27460/hovercard">#27460</a>, <a href="https://redirect.github.com/facebook/react/pull/28557" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28557/hovercard">#28557</a>, <a href="https://redirect.github.com/facebook/react/pull/27570" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27570/hovercard">#27570</a>, <a href="https://redirect.github.com/facebook/react/pull/27571" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27571/hovercard">#27571</a>, <a href="https://redirect.github.com/facebook/react/pull/28631" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28631/hovercard">#28631</a>, <a href="https://redirect.github.com/facebook/react/pull/28788" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28788/hovercard">#28788</a>, <a href="https://redirect.github.com/facebook/react/pull/29694" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/29694/hovercard">#29694</a>, <a href="https://redirect.github.com/facebook/react/pull/29695" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/29695/hovercard">#29695</a>, <a href="https://redirect.github.com/facebook/react/pull/29694" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/29694/hovercard">#29694</a>, <a href="https://redirect.github.com/facebook/react/pull/29665" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/29665/hovercard">#29665</a>, <a href="https://redirect.github.com/facebook/react/pull/28232" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28232/hovercard">#28232</a>, <a href="https://redirect.github.com/facebook/react/pull/28319" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28319/hovercard">#28319</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/eps1lon/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/eps1lon">@ eps1lon</a>, and <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/rickhanlonii/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/rickhanlonii">@ rickhanlonii</a>)</li> <li>Add <code>use()</code> API to read resources in render (<a href="https://redirect.github.com/facebook/react/pull/25084" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25084/hovercard">#25084</a>, <a href="https://redirect.github.com/facebook/react/pull/25202" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25202/hovercard">#25202</a>, <a href="https://redirect.github.com/facebook/react/pull/25207" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25207/hovercard">#25207</a>, <a href="https://redirect.github.com/facebook/react/pull/25214" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25214/hovercard">#25214</a>, <a href="https://redirect.github.com/facebook/react/pull/25226" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25226/hovercard">#25226</a>, <a href="https://redirect.github.com/facebook/react/pull/25247" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25247/hovercard">#25247</a>, <a href="https://redirect.github.com/facebook/react/pull/25539" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25539/hovercard">#25539</a>, <a href="https://redirect.github.com/facebook/react/pull/25538" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25538/hovercard">#25538</a>, <a href="https://redirect.github.com/facebook/react/pull/25537" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25537/hovercard">#25537</a>, <a href="https://redirect.github.com/facebook/react/pull/25543" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25543/hovercard">#25543</a>, <a href="https://redirect.github.com/facebook/react/pull/25561" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25561/hovercard">#25561</a>, <a href="https://redirect.github.com/facebook/react/pull/25620" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25620/hovercard">#25620</a>, <a href="https://redirect.github.com/facebook/react/pull/25615" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25615/hovercard">#25615</a>, <a href="https://redirect.github.com/facebook/react/pull/25922" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25922/hovercard">#25922</a>, <a href="https://redirect.github.com/facebook/react/pull/25641" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25641/hovercard">#25641</a>, <a href="https://redirect.github.com/facebook/react/pull/25634" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25634/hovercard">#25634</a>, <a href="https://redirect.github.com/facebook/react/pull/26232" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26232/hovercard">#26232</a>, <a href="https://redirect.github.com/facebook/react/pull/26535" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26535/hovercard">#26536</a>, <a href="https://redirect.github.com/facebook/react/pull/26739" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26739/hovercard">#26739</a>, <a href="https://redirect.github.com/facebook/react/pull/28233" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28233/hovercard">#28233</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/mofeiZ/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/mofeiZ">@ mofeiZ</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sebmarkbage/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sebmarkbage">@ sebmarkbage</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sophiebits/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sophiebits">@ sophiebits</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/eps1lon/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/eps1lon">@ eps1lon</a>, and <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/hansottowirtz/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/hansottowirtz">@ hansottowirtz</a>)</li> <li>Add <code>useOptimistic()</code> hook to display mutated state optimistically during an async mutation (<a href="https://redirect.github.com/facebook/react/pull/26740" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26740/hovercard">#26740</a>, <a href="https://redirect.github.com/facebook/react/pull/26772" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26772/hovercard">#26772</a>, <a href="https://redirect.github.com/facebook/react/pull/27277" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27277/hovercard">#27277</a>, <a href="https://redirect.github.com/facebook/react/pull/27453" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27453/hovercard">#27453</a>, <a href="https://redirect.github.com/facebook/react/pull/27454" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27454/hovercard">#27454</a>, <a href="https://redirect.github.com/facebook/react/pull/27936" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27936/hovercard">#27936</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>)</li> <li>Added an <code>initialValue</code> argument to <code>useDeferredValue()</code> hook (<a href="https://redirect.github.com/facebook/react/pull/27500" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27500/hovercard">#27500</a>, <a href="https://redirect.github.com/facebook/react/pull/27509" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27509/hovercard">#27509</a>, <a href="https://redirect.github.com/facebook/react/pull/27512" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27512/hovercard">#27512</a>, <a href="https://redirect.github.com/facebook/react/pull/27888" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27888/hovercard">#27888</a>, <a href="https://redirect.github.com/facebook/react/pull/27550" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27550/hovercard">#27550</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>)</li> <li>Support refs as props, warn on <code>element.ref</code> access (<a href="https://redirect.github.com/facebook/react/pull/28348" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28348/hovercard">#28348</a>, <a href="https://redirect.github.com/facebook/react/pull/28464" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28464/hovercard">#28464</a>, <a href="https://redirect.github.com/facebook/react/pull/28731" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28731/hovercard">#28731</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>)</li> <li>Support Custom Elements (<a href="https://redirect.github.com/facebook/react/pull/22184" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/22184/hovercard">#22184</a>, <a href="https://redirect.github.com/facebook/react/pull/26524" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26524/hovercard">#26524</a>, <a href="https://redirect.github.com/facebook/react/pull/26523" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26523/hovercard">#26523</a>, <a href="https://redirect.github.com/facebook/react/pull/27511" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27511/hovercard">#27511</a>, <a href="https://redirect.github.com/facebook/react/pull/24541" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/24541/hovercard">#24541</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/josepharhar/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/josepharhar">@ josepharhar</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sebmarkbage/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sebmarkbage">@ sebmarkbage</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/gnoff/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/gnoff">@ gnoff</a> and <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/eps1lon/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/eps1lon">@ eps1lon</a>)</li> <li>Add ref cleanup function (<a href="https://redirect.github.com/facebook/react/pull/25686" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25686/hovercard">#25686</a>, <a href="https://redirect.github.com/facebook/react/pull/28883" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28883/hovercard">#28883</a>, <a href="https://redirect.github.com/facebook/react/pull/28910" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28910/hovercard">#28910</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sammy-SC/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sammy-SC">@ sammy-SC</a>), <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/jackpope/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/jackpope">@ jackpope</a>, and <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/kassens/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/kassens">@ kassens</a>)</li> <li>Sibling pre-rendering replaced by sibling pre-warming (<a href="https://redirect.github.com/facebook/react/pull/26380" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26380/hovercard">#26380</a>, <a href="https://redirect.github.com/facebook/react/pull/26549" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26549/hovercard">#26549</a>, <a href="https://redirect.github.com/facebook/react/pull/30761" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/30761/hovercard">#30761</a>, <a href="https://redirect.github.com/facebook/react/pull/30800" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/30800/hovercard">#30800</a>, <a href="https://redirect.github.com/facebook/react/pull/30762" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/30762/hovercard">#30762</a>, <a href="https://redirect.github.com/facebook/react/pull/30879" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/30879/hovercard">#30879</a>, <a href="https://redirect.github.com/facebook/react/pull/30934" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/30934/hovercard">#30934</a>, <a href="https://redirect.github.com/facebook/react/pull/30952" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/30952/hovercard">#30952</a>, <a href="https://redirect.github.com/facebook/react/pull/31056" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31056/hovercard">#31056</a>, <a href="https://redirect.github.com/facebook/react/pull/31452" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/31452/hovercard">#31452</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sammy-SC/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sammy-SC">@ sammy-SC</a>), <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/gnoff/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/gnoff">@ gnoff</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/jackpope/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/jackpope">@ jackpope</a>, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/rickhanlonii/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/rickhanlonii">@ rickhanlonii</a>)</li> <li>Don’t rethrow errors at the root (<a href="https://redirect.github.com/facebook/react/pull/28627" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28627/hovercard">#28627</a>, <a href="https://redirect.github.com/facebook/react/pull/28641" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28641/hovercard">#28641</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sebmarkbage/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sebmarkbage">@ sebmarkbage</a>)</li> <li>Batch sync discrete, continuous, and default lanes (<a href="https://redirect.github.com/facebook/react/pull/25700" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25700/hovercard">#25700</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/tyao1/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/tyao1">@ tyao1</a>)</li> <li>Switch <code><Context></code> to mean <code><Context.Provider></code> (<a href="https://redirect.github.com/facebook/react/pull/28226" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28226/hovercard">#28226</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/gaearon/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/gaearon">@ gaearon</a>)</li> <li>Changes to <em>StrictMode</em> <ul> <li>Handle <code>info</code>, <code>group</code>, and <code>groupCollapsed</code> in <em>StrictMode</em> logging (<a href="https://redirect.github.com/facebook/react/pull/25172" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25172/hovercard">#25172</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/timneutkens/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/timneutkens">@ timneutkens</a>)</li> <li>Refs are now attached/detached/attached in <em>StrictMode</em> (<a href="https://redirect.github.com/facebook/react/pull/25049" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25049/hovercard">#25049</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sammy-SC/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sammy-SC">@ sammy-SC</a>)</li> <li>Fix <code>useSyncExternalStore()</code> hydration in <em>StrictMode</em> (<a href="https://redirect.github.com/facebook/react/pull/26791" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26791/hovercard">#26791</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sophiebits/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sophiebits">@ sophiebits</a>)</li> <li>Always trigger <code>componentWillUnmount()</code> in <em>StrictMode</em> (<a href="https://redirect.github.com/facebook/react/pull/26842" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26842/hovercard">#26842</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/tyao1/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/tyao1">@ tyao1</a>)</li> <li>Restore double invoking <code>useState()</code> and <code>useReducer()</code> initializer functions in <em>StrictMode</em> (<a href="https://redirect.github.com/facebook/react/pull/28248" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/28248/hovercard">#28248</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/eps1lon/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/eps1lon">@ eps1lon</a>)</li> <li>Reuse memoized result from first pass (<a href="https://redirect.github.com/facebook/react/pull/25583" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25583/hovercard">#25583</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>)</li> <li>Fix <code>useId()</code> in <em>StrictMode</em> (<a href="https://redirect.github.com/facebook/react/pull/25713" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25713/hovercard">#25713</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/gnoff/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/gnoff">@ gnoff</a>)</li> <li>Add component name to <em>StrictMode</em> error messages (<a href="https://redirect.github.com/facebook/react/pull/25718" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25718/hovercard">#25718</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sammy-SC/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sammy-SC">@ sammy-SC</a>)</li> </ul> </li> <li>Add support for rendering BigInt (<a href="https://redirect.github.com/facebook/react/pull/24580" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/24580/hovercard">#24580</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/eps1lon/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/eps1lon">@ eps1lon</a>)</li> <li><code>act()</code> no longer checks <code>shouldYield</code> which can be inaccurate in test environments (<a href="https://redirect.github.com/facebook/react/pull/26317" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26317/hovercard">#26317</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>)</li> <li>Warn when keys are spread with props (<a href="https://redirect.github.com/facebook/react/pull/25697" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25697/hovercard">#25697</a>, <a href="https://redirect.github.com/facebook/react/pull/26080" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26080/hovercard">#26080</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/sebmarkbage/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/sebmarkbage">@ sebmarkbage</a> and <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/kassens/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/kassens">@ kassens</a>)</li> <li>Generate sourcemaps for production build artifacts (<a href="https://redirect.github.com/facebook/react/pull/26446" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26446/hovercard">#26446</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/markerikson/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/markerikson">@ markerikson</a>)</li> <li>Improve stack diffing algorithm (<a href="https://redirect.github.com/facebook/react/pull/27132" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/27132/hovercard">#27132</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/KarimP/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/KarimP">@ KarimP</a>)</li> <li>Suspense throttling lowered from 500ms to 300ms (<a href="https://redirect.github.com/facebook/react/pull/26803" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26803/hovercard">#26803</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>)</li> <li>Lazily propagate context changes (<a href="https://redirect.github.com/facebook/react/pull/20890" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/20890/hovercard">#20890</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a> and <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/gnoff/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/gnoff">@ gnoff</a>)</li> <li>Immediately rerender pinged fiber (<a href="https://redirect.github.com/facebook/react/pull/25074" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/25074/hovercard">#25074</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>)</li> <li>Move update scheduling to microtask (<a href="https://redirect.github.com/facebook/react/pull/26512" data-hovercard-type="pull_request" data-hovercard-url="/facebook/react/pull/26512/hovercard">#26512</a> by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/acdlite/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/acdlite">@ acdlite</a>)</li> <li>Consistently apply throttled retries (<a href="https://redirect.github.com/facebook/react/pull/26611" data-hovercard-typ…

acdlite added 3 commits January 24, 2024 17:45

Batch async updates to classes, roots too

f032dfe

This implements the previous fix for class components and root-level updates, too. I put this in its own step because there are some extra changes related to avoiding a context stack mismatch.

facebook-github-bot added CLA Signed React Core Team labels Jan 24, 2024

acdlite marked this pull request as ready for review January 24, 2024 23:14

sebmarkbage approved these changes Jan 24, 2024

View reviewed changes

acdlite merged commit 11c9fd0 into facebook:main Jan 25, 2024

gnoff mentioned this pull request Feb 1, 2024

Update React from 60a927d04 to 2bc7d336a vercel/next.js#61522

Merged

ztanner mentioned this pull request Mar 19, 2024

(backport) Update React from 60a927d04 to 14898b6a9 vercel/next.js#63442

Closed

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Batch async actions even if useTransition is unmounted #28078

Batch async actions even if useTransition is unmounted #28078

acdlite commented Jan 24, 2024

react-sizebot commented Jan 24, 2024

Batch async actions even if useTransition is unmounted #28078

Batch async actions even if useTransition is unmounted #28078

Conversation

acdlite commented Jan 24, 2024

react-sizebot commented Jan 24, 2024

Critical size changes

Significant size changes