build(deps): bump the web-deps group across 1 directory with 34 updates

[dependabot]

Bumps the web-deps group with 34 updates in the /web directory:

Package	From	To
@fontsource-variable/fira-code	5.0.18	5.1.0
@fontsource-variable/inter	5.0.18	5.1.0
@fontsource-variable/newsreader	5.0.19	5.1.0
@headlessui/react	2.0.4	2.2.0
@netlify/plugin-nextjs	5.3.3	5.9.0
@tailwindcss/typography	0.5.13	0.5.15
follow-redirects	1.15.6	1.15.9
inter-ui	4.0.2	4.1.0
next	14.2.4	15.0.4
react	18.3.1	19.0.0
@types/react	18.3.3	19.0.1
react-dom	18.3.1	19.0.0
@types/react-dom	18.3.0	19.0.1
rehype-parse	9.0.0	9.0.1
@grpc/grpc-js	1.10.9	1.12.4
@types/node	20.14.6	22.10.1
@typescript-eslint/eslint-plugin	7.13.1	8.18.0
@typescript-eslint/parser	7.13.1	8.18.0
autoprefixer	10.4.19	10.4.20
cypress	13.12.0	13.16.1
eslint	8.57.0	9.16.0
@types/eslint	8.56.10	9.6.1
eslint-config-next	14.2.4	15.0.4
eslint-plugin-cypress	3.3.0	4.1.0
netlify-cli	17.28.0	17.38.0
postcss	8.4.38	8.4.49
rehype-stringify	10.0.0	10.0.1
remark-rehype	11.1.0	11.1.1
start-server-and-test	2.0.4	2.0.8
tailwindcss	3.4.4	3.4.16
tsx	4.15.6	4.19.2
typescript	5.4.5	5.7.2
ws	8.17.1	8.18.0
@esbuild/linux-x64	0.21.5	0.24.0

Updates @fontsource-variable/fira-code from 5.0.18 to 5.1.0

Commits

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Updates @fontsource-variable/inter from 5.0.18 to 5.1.0

Commits

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Updates @fontsource-variable/newsreader from 5.0.19 to 5.1.0

Commits

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Updates @headlessui/react from 2.0.4 to 2.2.0

Release notes

Sourced from @​headlessui/react's releases.

@​headlessui/react@​v2.2.0

Added

• Add React 19 support (#3543)

@​headlessui/react@​v2.1.10

Fixed

• Use React.JSX instead of deprecated global JSX (#3511)
• Fix crash in ListboxOptions when using as={Fragment} (#3513)

@​headlessui/react@​v2.1.9

Fixed

• Ensure Element is available before polyfilling to prevent crashes in non-browser environments (#3493)
• Fix crash when using instanceof HTMLElement in some environments (#3494)
• Cleanup process in Combobox component when using virtualization (#3495)

@​headlessui/react@​v2.1.8

Fixed

• Fix crash when using as={Fragment} on MenuButton, ListboxButton, DisclosureButton or Button components (#3478)

@​headlessui/react@​v2.1.7

Fixed

• Prevent crash in environments where Element.prototype.getAnimations is not available (#3473)

@​headlessui/react@​v2.1.6

Fixed

• Fix ListboxOptions being incorrectly marked as inert (#3466)
• Fix crash when using DisclosureButton inside of a DisclosurePanel when the Disclosure is open by default (#3465)

@​headlessui/react@​v2.1.5

Fixed

• Fix transition bug on Firefox, triggered by clicking the PopoverButton in rapid succession (#3452)

@​headlessui/react@​v2.1.4

Fixed

• Fix components not closing properly when using the transition prop (#3448)

@​headlessui/react@​v2.1.3

Fixed

• Ensure Transition component state doesn't change when it becomes hidden (#3372)
• Fix closing components using the transition prop, and after scrolling the page (#3407)
• Ensure all client components are marked correctly to avoid a crash with React 19 and Turbopack (#3429)

... (truncated)

Changelog

Sourced from @​headlessui/react's changelog.

[2.2.0] - 2024-10-25

Added

• Add React 19 support (#3543)

[2.1.10] - 2024-10-10

Fixed

• Use React.JSX instead of deprecated global JSX (#3511)
• Fix crash in ListboxOptions when using as={Fragment} (#3513)

[2.1.9] - 2024-10-03

Fixed

• Ensure Element is available before polyfilling to prevent crashes in non-browser environments (#3493)
• Fix crash when using instanceof HTMLElement in some environments (#3494)
• Cleanup process in Combobox component when using virtualization (#3495)

[2.1.8] - 2024-09-12

Fixed

• Fix crash when using as={Fragment} on MenuButton, ListboxButton, DisclosureButton or Button components (#3478)

[2.1.7] - 2024-09-11

Fixed

• Prevent crash in environments where Element.prototype.getAnimations is not available (#3473)

[2.1.6] - 2024-09-09

Fixed

• Fix ListboxOptions being incorrectly marked as inert (#3466)
• Fix crash when using DisclosureButton inside of a DisclosurePanel when the Disclosure is open by default (#3465)

[2.1.5] - 2024-09-04

Fixed

• Fix transition bug on Firefox, triggered by clicking the PopoverButton in rapid succession (#3452)

[2.1.4] - 2024-09-03

Fixed

... (truncated)

Commits

• d71fb9c 2.2.0 - @​headlessui/react
• 8814b0e Add React 19 support (#3543)
• 5eb3b12 2.1.10 - @​headlessui/react
• a4953a2 Fix crash in ListboxOptions when using as={Fragment} (#3513)
• 3b047fc update changelog
• 13d8829 Use React.JSX instead of JSX (#3511)
• 2422250 2.1.9 - @​headlessui/react
• 02b43d0 Cleanup process in Combobox component when using virtualization (#3495)
• 63daa86 Fix crash when using instanceof HTMLElement in some environments (#3494)
• f2c80c4 Ensure Element is available before polyfilling (#3493)
• Additional commits viewable in compare view

Updates @netlify/plugin-nextjs from 5.3.3 to 5.9.0

Release notes

Sourced from @​netlify/plugin-nextjs's releases.

v5.8.1

5.8.1 (2024-10-21)

Bug Fixes

• create cache entries for fallback pages to support next@canary (#2649) (8ab259a)

v5.8.0

5.8.0 (2024-10-16)

Features

• cache 404s indefinitely for bot probes (#2668) (60885d2)

Bug Fixes

• adjust cache-control handling for [email protected] (#2666) (7e5253d)
• use alternative way of gathering api functions to anaylze (#2654) (e4916da)

v5.7.4

5.7.4 (2024-10-09)

Bug Fixes

• handle non ASCII characters in cache-tag headers (#2645) (fcf2414)

v5.7.3

5.7.3 (2024-10-01)

Bug Fixes

• handle middleware redirects to default locale and same path (#2636) (f0fa7d0)

v5.7.2

5.7.2 (2024-09-17)

Bug Fixes

• use durable cache when serving stale response (#2591) (79e2a2c)

v5.7.1

5.7.1 (2024-09-06)

... (truncated)

Changelog

Sourced from @​netlify/plugin-nextjs's changelog.

5.9.0 (2024-12-09)

Features

• support after() (#2717) (51e5373)

Bug Fixes

• add data request query param to the cache key (#2701) (00e3a4b)

5.8.1 (2024-10-21)

Bug Fixes

• create cache entries for fallback pages to support next@canary (#2649) (8ab259a)

5.8.0 (2024-10-16)

Features

• cache 404s indefinitely for bot probes (#2668) (60885d2)

Bug Fixes

• adjust cache-control handling for [email protected] (#2666) (7e5253d)
• use alternative way of gathering api functions to anaylze (#2654) (e4916da)

5.7.4 (2024-10-09)

Bug Fixes

• handle non ASCII characters in cache-tag headers (#2645) (fcf2414)

5.7.3 (2024-10-01)

Bug Fixes

• handle middleware redirects to default locale and same path (#2636) (f0fa7d0)

5.7.2 (2024-09-17)

Bug Fixes

... (truncated)

Commits

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Updates @tailwindcss/typography from 0.5.13 to 0.5.15

Release notes

Sourced from @​tailwindcss/typography's releases.

v0.5.15

Fixed

• Support installing with alpha versions of Tailwind CSS v4 (#358)

v0.5.14

• Fix table text alignment (#346)

Changelog

Sourced from @​tailwindcss/typography's changelog.

[0.5.15] - 2024-08-28

Fixed

• Support installing with alpha versions of Tailwind CSS v4 (#358)

[0.5.14] - 2024-08-07

Fixed

• Fix table text alignment (#346)

Commits

• 199a0c6 0.5.15
• fa5beec Modernize repository setup (#359)
• 1da9d14 Update peer dependency version to include 4.0.0-alpha.20 (#358)
• 7b43b3b 0.5.14
• 41b694d Update changelog
• 815dfc4 Fix table text align (#346)
• 2745585 Bump braces and jest (#353)
• f364a16 use Node 22 in CI workflows (#354)
• See full diff in compare view

Updates follow-redirects from 1.15.6 to 1.15.9

Commits

• e4e55c7 Release version 1.15.9 of the npm package.
• 31a1abf Attempt much more gentle detection.
• d2aaa97 Fix url field.
• 62558f0 Release version 1.15.8 of the npm package.
• a8d1cee Return subtlety.
• 458ca8e Fix native URL test for Node 20.
• ca49e44 Handle KeepAlive connections in tests.
• f3711d7 Test on Node 20 and 22.
• fda0faf Fix typo.
• 760757f Release version 1.15.7 of the npm package.
• Additional commits viewable in compare view

Updates inter-ui from 4.0.2 to 4.1.0

Changelog

Sourced from inter-ui's changelog.

[4.1.0] - 2024-11-19

• Updated font files to Inter 4.1 release, please see their release notes

Commits

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Updates next from 14.2.4 to 15.0.4

Release notes

Sourced from next's releases.

v15.0.4

[!NOTE]
This release is backporting changes. It does not include all pending features/changes on canary.

Core Changes

• Use React 19 stable in Pages Router: vercel/next.js#73564

Credits

Huge thanks to @​eps1lon

v15.0.4-canary.48

Misc Changes

• refactor(turbopack): Use ResolvedVc<T> for struct fields in extra crates: #73451
• refactor(turbopack): Use ResolvedVc<T> for struct fields in next-api, final part: #73367
• docs: Fix image component API reference parsing: #73658
• docs: fix code block language in images-and-fonts docs: #73492

Credits

Huge thanks to @​kdy1, @​eps1lon, and @​JamBalaya56562 for helping!

v15.0.4-canary.47

Misc Changes

• test: fix next-sass test: #73633

Credits

Huge thanks to @​samcx for helping!

v15.0.4-canary.46

Core Changes

• Use consistent error formatting in terminal: #71909
• [Segment Cache] Interception routes: #73434
• Upgrade to typescript 5.7: #73594
• [Segment Cache] Use LRU to manage cache data : #73486
• [Segment Cache] Add isPartial to segment prefetch : #73528
• Fix missing client reference manifest error when using route groups: #73606
• feat(after): stabilize unstable_after: #73605
• [Segment Cache] Add isHeadPartial: #73530
• fix: do not add suffix for sitemap under group routes: #73570
• Dynamic IO: Improve error handling: #73607

Example Changes

• Bump examples/** Eslint to v9: #73560

... (truncated)

Commits

• d6a6aa1 v15.0.4
• 8f61250 Designate as backport branch
• 8774088 [Backport 15.0] Use React 19 stable (#73564)
• 7dc7be2 v15.0.3
• 74b4d2d v15.0.3-canary.9
• be40adb Add missing closing \</AppOnly> (#72453)
• 224447c Getting Started Docs: Improve "Project Structure" page (#72399)
• 5f0adad chore(turbopack): Update dashmap from 5.x to 6.x (#72433)
• f668af2 [ppr] Fixed deployment tests (#72428)
• 856521b docs(parallel-routes): update 11-parallel-routes.mdx example for modal closin...
• Additional commits viewable in compare view

Updates react from 18.3.1 to 19.0.0

Release notes

Sourced from react's releases.

19.0.0 (December 5, 2024)

Below is a list of all new features, APIs, deprecations, and breaking changes. Read React 19 release post and React 19 upgrade guide for more information.

Note: To help make the upgrade to React 19 easier, we’ve published a [email protected] 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.

New Features

React

• Actions: startTransition can now accept async functions. Functions passed to startTransition 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 fetch() in the pending state, and provides support for error handling, and optimistic updates.
• useActionState: 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 action prop to support progressive enhancement in forms.
• useOptimistic: 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.
• use: is a new API that allows reading resources in render. In React 19, use accepts a promise or Context. If provided a promise, use will suspend until a value is resolved. use can only be used in render but can be called conditionally.
• ref as a prop: Refs can now be used as props, removing the need for forwardRef.
• Suspense sibling pre-warming: 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.

React DOM Client

• <form> action prop: Form Actions allow you to manage forms automatically and integrate with useFormStatus. When a <form> action succeeds, React will automatically reset the form for uncontrolled components. The form can be reset manually with the new requestFormReset API.
• <button> and <input> formAction prop: Actions can be passed to the formAction prop to configure form submission behavior. This allows using different Actions depending on the input.
• useFormStatus: is a new hook that provides the status of the parent <form> action, as if the form was a Context provider. The hook returns the values: pending, data, method, and action.
• Support for Document Metadata: We’ve added support for rendering document metadata tags in components natively. React will automatically hoist them into the <head> section of the document.
• Support for Stylesheets: React 19 will ensure stylesheets are inserted into the <head> on the client before revealing the content of a Suspense boundary that depends on that stylesheet.
• Support for async scripts: Async scripts can be rendered anywhere in the component tree and React will handle ordering and deduplication.
• Support for preloading resources: React 19 ships with preinit, preload, prefetchDNS, and preconnect 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.

React DOM Server

• Added prerender and prerenderToNodeStream APIs for static site generation. They are designed to work with streaming environments like Node.js Streams and Web Streams. Unlike renderToString, they wait for data to load for HTML generation.

React Server Components

• 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 docs for how to support React Server Components.

Deprecations

• Deprecated: element.ref access: React 19 supports ref as a prop, so we’re deprecating element.ref in favor of element.props.ref. Accessing will result in a warning.
• react-test-renderer: 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)

Breaking Changes

React 19 brings in a number of breaking changes, including the removals of long-deprecated APIs. We recommend first upgrading to 18.3.1, where we've added additional deprecation warnings. Check out the upgrade guide for more details and guidance on codemodding.

React

• New JSX Transform is now required: We introduced a new JSX transform 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.
• 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 onUncaughtError and onCaughtError methods to createRoot and hydrateRoot to customize this error handling.
• Removed: propTypes: Using propTypes will now be silently ignored. If required, we recommend migrating to TypeScript or another type-checking solution.
• Removed: defaultProps for functions: ES6 default parameters can be used in place. Class components continue to support defaultProps since there is no ES6 alternative.
• Removed: contextTypes and getChildContext: Legacy Context for class components has been removed in favor of the contextType API.

... (truncated)

Changelog

Sourced from react's changelog.

19.0.0 (December 5, 2024)

Below is a list of all new features, APIs, deprecations, and breaking changes. Read React 19 release post and React 19 upgrade guide for more information.

Note: To help make the upgrade to React 19 easier, we’ve published a [email protected] 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.

New Features

React

• Actions: startTransition can now accept async functions. Functions passed to startTransition 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 fetch() in the pending state, and provides support for error handling, and optimistic updates.
• useActionState: 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 action prop to support progressive enhancement in forms.
• useOptimistic: 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.
• use: is a new API that allows reading resources in render. In React 19, use accepts a promise or Context. If provided a promise, use will suspend until a value is resolved. use can only be used in render but can be called conditionally.
• ref as a prop: Refs can now be used as props, removing the need for forwardRef.
• Suspense sibling pre-warming: 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.

React DOM Client

• <form> action prop: Form Actions allow you to manage forms automatically and integrate with useFormStatus. When a <form> action succeeds, React will automatically reset the form for uncontrolled components. The form can be reset manually with the new requestFormReset API.
• <button> and <input> formAction prop: Actions can be passed to the formAction prop to configure form submission behavior. This allows using different Actions depending on the input.
• useFormStatus: is a new hook that provides the status of the parent <form> action, as if the form was a Context provider. The hook returns the values: pending, data, method, and action.
• Support for Document Metadata: We’ve added support for rendering document metadata tags in components natively. React will automatically hoist them into the <head> section of the document.
• Support for Stylesheets: React 19 will ensure stylesheets are inserted into the <head> on the client before revealing the content of a Suspense boundary that depends on that stylesheet.
• Support for async scripts: Async scripts can be rendered anywhere in the component tree and React will handle ordering and deduplication.
• Support for preloading resources: React 19 ships with preinit, preload, prefetchDNS, and preconnect 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.

React DOM Server

• Added prerender and prerenderToNodeStream APIs for static site generation. They are designed to work with streaming environments like Node.js Streams and Web Streams. Unlike renderToString, they wait for data to load for HTML generation.

React Server Components

• 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 docs for how to support React Server Components.

Deprecations

• Deprecated: element.ref access: React 19 supports ref as a prop, so we’re deprecating element.ref in favor of element.props.ref. Accessing will result in a warning.
• react-test-renderer: 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 @​testing-library/react or @​testing-library/react-native

Breaking Changes

React 19 brings in a number of breaking changes, including the removals of long-deprecated APIs. We recommend first upgrading to 18.3.1, where we've added additional deprecation warnings. Check out the upgrade guide for more details and guidance on codemodding.

React

• New JSX Transform is now required: We introduced a new JSX transform 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.
• 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 onUncaughtError and onCaughtError methods to createRoot and hydrateRoot to customize this error handling.
• Removed: propTypes: Using propTypes will now be silently ignored. If required, we recommend migrating to TypeScript or another type-checking solution.
• Removed: defaultProps for functions: ES6 default parameters can be used in place. Class components continue to support defaultProps since there is no ES6 alternative.

... (truncated)

Commits

• e137890 [string-refs] cleanup string ref code (#31443)
• d1f0472 [string-refs] remove enableLogStringRefsProd flag (#31414)
• 3dc1e48 Followup: remove dead test code from #30346 (#31415)
• 07aa494 Remove enableRefAsProp feature flag (#30346)
• 45804af [flow] Eliminate usage of more than 1-arg React.AbstractComponent in React ...
• 5636fad [string-refs] log string ref from prod (#31161)
• b78a7f2 [rcr] Re-export useMemoCache in top level React namespace (#31139)
• 4e9540e [Fiber] Log the Render/Commit phases and the gaps in between (#31016)
• d4688df [Fiber] Track Event Time, startTransition Time and setState Time (#31008)
• 15da917 Don't read currentTransition back from internals (#30991)
• Additional commits viewable in compare view

Updates @types/react from 18.3.3 to 19.0.1

Commits

• See full diff in compare view

Updates react-dom from 18.3.1 to 19.0.0

Release notes

Sourced from react-dom's releases.

19.0.0 (December 5, 2024)

Below is a list of all new features, APIs, deprecations, and breaking changes. Read React 19 release post and React 19 upgrade guide for more information.

Note: To help make the upgrade to React 19 easier, we’ve published a [email protected] 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.

New Features

React

• Actions: startTransition can now accept async functions. Functions passed to startTransition 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 fetch() in the pending state, and provides support for error handling, and optimistic updates.
• useActionState: 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 action prop to support progressive enhancement in forms.
• useOptimistic: 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.
• use: is a new API that allows reading resources in render. In React 19, use accepts a promise or Context. If provided a promise, use will suspend until a value is resolved. use can only be used in render but can be called conditionally.
• ref as a prop: Refs can now be used as props, removing the need for forwardRef.
• Suspense sibling pre-warming: 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.

React DOM Client

• <form> action prop: Form Actions allow you to manage forms automatically and integrate with useFormStatus. When a <form> action succeeds, React will automatically reset the form for uncontrolled components. The form can be reset manually with the new requestFormReset API.
• <button> and <input> formAction prop: Actions can be passed to the formAction prop to configure form submission behavior. This allows using different Actions depending on the input.
• useFormStatus: is a new hook that provides the status of the parent <form> action, as if the form was a Context provider. The hook returns the values: pending, data, method, and action.
• Support for Document Metadata: We’ve added support for rendering document metadata tags in components natively. React will automatically hoist them into the <head> section of the document.
• Support for Stylesheets: React 19 will ensure stylesheets are inserted into the <head> on the client before revealing the content of a Suspense boundary that depends on that stylesheet.
• Support for async scripts: Async scripts can be rendered anywhere in the component tree and React will handle ordering and deduplication.
• Support for preloading resources: React 19 ships with preinit, preload, prefetchDNS, and preconnect 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.

React DOM Server

• Added prerender and prerenderToNodeStream APIs for static site generation. They are designed to work with streaming environments like Node.js Streams and Web Streams. Unlike renderToString, they wait for data to load for HTML generation.

React Server Components

• 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 docs for how to support React Server Components.

Deprecations

• Deprecated: element.ref access: React 19 supports ref as a prop, so we’re deprecating element.ref in favor of element.props.ref. Accessing will result in a warning.
• react-test-renderer: 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)

Breaking Changes

React 19 brings in a number of breaking changes, including the removals of long-deprecated APIs. We recommend first upgrading to 18.3.1, where we've added additional deprecation warnings. Check out the upgrade guide for more details and guidance on codemodding.

React

• New JSX Transform is now required: We introduced a new JSX transform 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.
• 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 onUncaughtError and onCaughtError methods to createRoot and hydrateRoot to customize this error handling.
• Removed: propTypes: Using propTypes will now be silently ignored. If required, we recommend migrating to TypeScript or another type-checking solution.
• Removed: defaultProps for functions: ES6 default parameters can be used in place. Class components continue to support defaultProps since there is no ES6 alternative.
• Removed: contextTypes and getChildContext: Legacy Context for class components has been removed in favor of the contextType API.

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Changelog

Sourced from react-dom's changelog.

19.0.0 (December 5, 2024)

Below is a list of all new features, APIs, deprecations, and breaking changes. Read React 19 release post and React 19 upgrade guide for more information.

Note: To help make the upgrade to React 19 easier, we’ve published a [email protected] 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.

New Features

React

• Actions: startTransition can now accept async functions. Functions passed to startTransition 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 fetch() in the pending state, and provides support for error handling, and optimistic updates.
• useActionState: 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 action prop to support progressive enhancement in forms.
• useOptimistic: 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.
• use: is a new API that allows reading resources in render. In React 19, use accepts a promise or Context. If provided a promise, use will suspend until a value is resolved. use can only be used in render but can be called conditionally.
• ref as a prop: Refs can now be used as props, removing the need for forwardRef.
• Suspense sibling pre-warming: 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.

React DOM Client

• <form> action prop: Form Actions allow you to manage forms automatically and integrate with useFormStatus. When a <form> action succeeds, React will automatically reset the form for uncontrolled components. The form can be reset manually with the new requestFormReset API.
• <button> and <input> formAction prop: Actions can be passed to the formAction prop to configure form submission behavior. This allows using different Actions depending on the input.
• useFormStatus: is a new hook that provides the status of the parent <form> action, as if the form was a Context provider. The hook returns the values: pending, data, method, and action.
• Support for Document Metadata: We’ve added support for rendering document metadata tags in components natively. React will automatically hoist them into the <head> section of the document.
• Support for Stylesheets: React 19 will ensure stylesheets are inserted into the <head> on the client before revealing the content of a Suspense boundary that depends on that stylesheet.
• Support for async scripts: Async scripts can be rendered anywhere in the component tree and React will handle ordering and deduplication.
• Support for preloading resources: React 19 ships with preinit, preload, prefetchDNS, and preconnect 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.

React DOM Server

• Added prerender and prerenderToNodeStream APIs for static site generation. They are designed to work with streaming environments like Node.js Streams and Web Streams. Unlike renderToString, they wait for data to load for HTML generation.

React Server Components

• 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 frame...

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