build(deps): bump the web-deps group across 1 directory with 38 updates

[dependabot]

Bumps the web-deps group with 38 updates in the /web directory:

Package	From	To
@fontsource-variable/fira-code	5.0.18	5.2.5
@fontsource-variable/inter	5.0.18	5.2.5
@fontsource-variable/newsreader	5.0.19	5.2.5
@headlessui/react	2.0.4	2.2.0
@netlify/plugin-nextjs	5.3.3	5.10.0
@tailwindcss/typography	0.5.13	0.5.16
follow-redirects	1.15.6	1.15.9
fuse.js	7.0.0	7.1.0
inter-ui	4.0.2	4.1.0
next	14.2.4	15.2.1
react	18.3.1	19.0.0
@types/react	18.3.3	19.0.10
react-dom	18.3.1	19.0.0
@types/react-dom	18.3.0	19.0.4
rehype-parse	9.0.0	9.0.1
@grpc/grpc-js	1.10.9	1.12.6
@types/node	20.14.6	22.13.10
@typescript-eslint/eslint-plugin	7.13.1	8.26.1
@typescript-eslint/parser	7.13.1	8.26.1
autoprefixer	10.4.19	10.4.21
cypress	13.12.0	14.1.0
eslint	8.57.0	9.22.0
@types/eslint	8.56.10	9.6.1
eslint-config-next	14.2.4	15.2.1
eslint-config-prettier	9.1.0	10.1.1
eslint-plugin-cypress	3.3.0	4.2.0
eslint-plugin-mdx	3.1.5	3.2.0
netlify-cli	17.28.0	19.0.2
postcss	8.4.38	8.5.3
rehype-stringify	10.0.0	10.0.1
remark-gfm	4.0.0	4.0.1
remark-rehype	11.1.0	11.1.1
start-server-and-test	2.0.4	2.0.10
tailwindcss	3.4.4	4.0.12
tsx	4.15.6	4.19.3
typescript	5.4.5	5.8.2
ws	8.17.1	8.18.1
@esbuild/linux-x64	0.21.5	0.25.1

Updates @fontsource-variable/fira-code from 5.0.18 to 5.2.5

Commits

• See full diff in compare view

Updates @fontsource-variable/inter from 5.0.18 to 5.2.5

Commits

• See full diff in compare view

Updates @fontsource-variable/newsreader from 5.0.19 to 5.2.5

Commits

• See full diff in compare view

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 5.10.0

Release notes

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

v5.10.0

5.10.0 (2025-03-07)

Features

• make CDN SWR background revalidation discard stale cache content in order to produce fresh responses (#2765) (f8004d7)

Bug Fixes

• apply caching headers to pages router 404 with getStaticProps (#2764) (3301077)
• don't cache POST when serving embedded static html (#2766) (28217d4)
• dynamic not-prerendered routes revalidate tracking for next@>=v15.2.1-canary.4 (b242927)
• narrow down middleware i18n locale matcher to concrete locales (#2768) (f3e24b1)
• set immutable cache-control for _next/static (#2767) (5bd68dd)

v5.9.4

5.9.4 (2025-01-22)

Bug Fixes

• ensure background work is finished when response has 3xx or 5xx status code (#2742) (ff2632f)
• use uint8array for htmlrewriter wasm module instead of base64 (25f6f30)
• use uint8array for user's wasm modules used in middleware instead of base64 (#2740) (aab8803)

v5.9.3

5.9.3 (2025-01-07)

Bug Fixes

• adjust middleware json data rewrite to work with recent next@canary (#2734) (5a602c3)

v5.9.2

5.9.2 (2024-12-20)

Bug Fixes

• make revalidateTags no-op when list of tags is empty (#2727) (38e58b3)
• set user agent for purge requests (#2730) (871f7b9)

v5.9.1

5.9.1 (2024-12-18)

Bug Fixes

... (truncated)

Changelog

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

5.10.0 (2025-03-07)

Features

• make CDN SWR background revalidation discard stale cache content in order to produce fresh responses (#2765) (f8004d7)

Bug Fixes

• apply caching headers to pages router 404 with getStaticProps (#2764) (3301077)
• don't cache POST when serving embedded static html (#2766) (28217d4)
• dynamic not-prerendered routes revalidate tracking for next@>=v15.2.1-canary.4 (b242927)
• narrow down middleware i18n locale matcher to concrete locales (#2768) (f3e24b1)
• set immutable cache-control for _next/static (#2767) (5bd68dd)

5.9.4 (2025-01-22)

Bug Fixes

• ensure background work is finished when response has 3xx or 5xx status code (#2742) (ff2632f)
• use uint8array for htmlrewriter wasm module instead of base64 (25f6f30)
• use uint8array for user's wasm modules used in middleware instead of base64 (#2740) (aab8803)

5.9.3 (2025-01-07)

Bug Fixes

• adjust middleware json data rewrite to work with recent next@canary (#2734) (5a602c3)

5.9.2 (2024-12-20)

Bug Fixes

• make revalidateTags no-op when list of tags is empty (#2727) (38e58b3)
• set user agent for purge requests (#2730) (871f7b9)

5.9.1 (2024-12-18)

Bug Fixes

• use version of htmlrewriter which does not make use of asyncify, which looks to have a potential memory leak under high load (#2721) (4d7ad97)

5.9.0 (2024-12-09)

... (truncated)

Commits

• 23b1f37 chore(main): release 5.10.0 (#2770)
• b242927 fix: dynamic not-prerendered routes revalidate tracking (#2771)
• 3301077 fix: apply caching headers to pages router 404 with getStaticProps (#2764)
• f8004d7 feat: make CDN SWR background revalidation discard stale cache content in ord...
• f3e24b1 fix: narrow down middleware i18n locale matcher to concrete locales (#2768)
• 28217d4 fix: don't cache POST when serving embedded static html (#2766)
• 5bd68dd fix: set immutable cache-control for _next/static (#2767)
• f4b59b6 chore(deps): update dependency vitest to v1.6.1 [security] (#2755)
• a3e083e chore(deps): update dependency esbuild to ^0.25.0 [security] (#2758)
• cc111b4 test: remove references to rolled out feature flag (#2760)
• Additional commits viewable in compare view

Updates @tailwindcss/typography from 0.5.13 to 0.5.16

Release notes

Sourced from @​tailwindcss/typography's releases.

v0.5.16

Fixed

• Support installing with beta versions of Tailwind CSS v4 (#365)

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.

[0.5.16] - 2025-01-07

Fixed

• Support installing with beta versions of Tailwind CSS v4 (#365)

[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

• 39d20e1 0.5.16
• 25b0f9e Update peer dependency version to include 4.0.0-beta.1 (#365)
• 383bee7 Clean up extra spread array (#362)
• 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)
• Additional commits viewable 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 fuse.js from 7.0.0 to 7.1.0

Release notes

Sourced from fuse.js's releases.

v7.1.0

What's Changed

• feat: add option to ignore diacritics by @​piitaya in krisk/Fuse#773
• Clarify input to Fuse.parseIndex by @​dbaynard in krisk/Fuse#782
• Update CHANGELOG.md, fix typos by @​NicholasWilsonDEV in krisk/Fuse#783

New Contributors

• @​NicholasWilsonDEV made their first contribution in krisk/Fuse#783
• @​dbaynard made their first contribution in krisk/Fuse#782
• @​piitaya made their first contribution in krisk/Fuse#773

Full Changelog: krisk/Fuse@v7.0.0...v7.1.0

Changelog

Sourced from fuse.js's changelog.

7.1.0 (2025-02-03)

Features

• add ignore diacritics (e0fcdb1)
• add option to ignore diacritics (fb012b7)

Bug Fixes

• remove console.log (1c749a3)
• typescript: clarify input to parseIndex (72b6e25), closes #524 #624
• typescript: clarify input to parseIndex (78c628e), closes #524 #624

Commits

• 8119c18 chore(release): 7.1.0
• ef16371 Merge branch 'ignore-diacritics'
• e0fcdb1 feat: add ignore diacritics
• d89d15e chore: clarify index support
• ef34425 docs: document input to parseIndex explicitly
• 72b6e25 fix(typescript): clarify input to parseIndex
• 4e30d3e Update CHANGELOG.md, fix typos
• 40e27de chore: update copyright year
• 47e4d67 chore: add sponsor
• d753d85 docs: add litslink
• 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

• See full diff in compare view

Updates next from 14.2.4 to 15.2.1

Release notes

Sourced from next's releases.

v15.2.1

Core Changes

• Unify Link and Form prefetching: #76184
• Turbopack: Ensure server actions sourcemaps tests pass: #76157
• [dev-overlay] control dark theme in one place: #76528
• [dev-overlay] change css var for terminal: #76590
• [dev-overlay] Discriminate stack frame settled typed: #76517
• Remove obsolete sourcePackage references: #76550
• refactor: remove unused variable in externals handling: #76599
• fix: Add popular embedding libraries to serverExternalPackages: #76574
• [Segment Cache] Implement hash-only navigations: #76179
• Webpack: abstract away getting compilation spans: #76579
• report compiler duration for webpack and improve numbers: #76665
• [dev-overlay] fix dark theme missing close bracket: #76672
• Remove revalidate property from incremental cache ctx for FETCH kind: #76500
• [dev-overlay] fix: env name label style was out of sync with error type label: #76668
• Turbopack: avoid celling source maps before minify: #76626
• refactor(CI): Merge all four bundler test manifest scripts into one: #76652
• [metadata] fix duplicate metadata for parallel routes: #76669
• [Segment Cache] Omit from bundle if flag disabled: #76622
• [Segment Cache] Support output: "export" mode: #75671
• [Segment Cache] Refresh on same-page navigation: #76223
• [metadata] re-enable streaming metadata with PPR: #76119
• [Segment Cache] Search param fallback handling: #75990
• [Segment Cache] Fix: canonicalURL omits origin: #76444
• fix metadata basePath for manifest: #76681
• Propagate expire time to cache-control header and prerender manifest: #76207
• Show revalidate/expire columns in build output: #76343
• Gate alternate bundler behind canary only: #76634
• [dynamicIO] routes with dynamic segments should be able to be static in dev: #76691
• [repo] upgrade ts 5.8.2: #76709
• [metadata]: ensure metadata boundary is only rendered once on client nav: #76692
• [metadata] clean up redudant options: #76712
• Fix uniqueness detection for generateStaticParams: #76713
• Upgrade React from 22e39ea7-20250225 to d55cc79b-20250228: #76680
• [Turbopack] Compute module batches and use them for chunking: #76133
• [Dev Tools] Improve keyboard interactions for menu & overlays: #76754
• Keep server code out of browser chunks: #76660
• Turbopack: inline minify into code generation and make it a plain function instead of a turbo tasks function: #76628
• fix edge runtime asset fetch in pages api: #76750
• Update use-cache-unknown-cache-kind.test.ts snapshot for alternate bundler: #76682

Example Changes

• docs: fix reading params code blocks: #76705

Misc Changes

• fix(rustdoc): Fix rustdoc warnings, block on rustdoc failures in CI: #76448

... (truncated)

Commits

• 6338781 v15.2.1
• 197b4bb v15.2.1-canary.6
• f5e2dcc Update use-cache-unknown-cache-kind.test.ts snapshot for alternate bundler (#...
• e45411e Fix flaky Bun test (#76763)
• 0940320 chore(github): move top prs and feature requests to different Slack channel (...
• 4369731 feat(CI): Revalidate vercel data cache on areweturboyet after uploading data ...
• 58a22f7 Disable flaky Turbopack tests (#76760)
• 6dc8579 fix edge runtime asset fetch in pages api (#76750)
• ead6e95 Fix: missing close brace in demo code (#76549)
• bd39335 toDisplayRedbox(): replace all occurrences of testDir (#76618)
• 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 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.

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 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.

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)

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