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chore(deps): update dependency react to v19 - #1330

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@renovate-sh-app renovate-sh-app Bot commented Oct 12, 2026 •

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ℹ️ Note

This PR body was truncated due to platform limits.

This PR contains the following updates:

Package Change Age Confidence
react (source) 18.3.1 → 19.3.1 age confidence
@types/react (source) 18.3.31 → 19.3.0 age confidence

Release Notes

react/react (react)

v19.3.1: 19.3.1 (October 14th, 2026)

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React Server Components

v19.3.0

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New React Features
New React DOM Features
  • browser(): a new react-dom API that returns a usable which errors during server rendering and resolves in the browser. use(browser()) inside a <Suspense> boundary marks a subtree as browser-only without reporting a recoverable error (@​gnoff: #​37143, #​37241)
    • Added an onBrowserBailout option to the react-dom/server APIs to observe when a subtree defers to the browser (@​gnoff #​37193)
Notable changes
All Changes
React
React DOM
React Server
React Server Components

v19.2.9: 19.2.9 (October 14th, 2026)

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React Server Components

v19.2.8: 19.2.8 (July 21st, 2026)

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React Server Components

v19.2.7

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React Server Components

v19.2.6

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React Server Components

v19.2.5

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React Server Components

v19.2.4

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React Server Components

v19.2.3

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React Server Components

v19.2.2

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React Server Components

v19.2.1

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React Server Components

v19.2.0

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Below is a list of all new features, APIs, and bug fixes.

Read the React 19.2 release post for more information.

New React Features
  • <Activity>: A new API to hide and restore the UI and internal state of its children.
  • useEffectEvent is a React Hook that lets you extract non-reactive logic into an Effect Event.
  • cacheSignal (for RSCs) lets your know when the cache() lifetime is over.
  • React Performance tracks appear on the Performance panel’s timeline in your browser developer tools
New React DOM Features
  • Added resume APIs for partial pre-rendering with Web Streams:
  • Added resume APIs for partial pre-rendering with Node Streams:
  • Updated prerender APIs to return a postponed state that can be passed to the resume APIs.
Notable changes
  • React DOM now batches suspense boundary reveals, matching the behavior of client side rendering. This change is especially noticeable when animating the reveal of Suspense boundaries e.g. with the upcoming <ViewTransition> Component. React will batch as much reveals as possible before the first paint while trying to hit popular first-contentful paint metrics.
  • Add Node Web Streams (prerender, renderToReadableStream) to server-side-rendering APIs for Node.js
  • Use underscore instead of : IDs generated by useId
All Changes
React
React DOM
React Server Components
React Reconciler

v19.1.10: 19.1.10 (October 14th, 2026)

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React Server Components

v19.1.9: 19.1.9 (July 21st, 2026)

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React Server Components

v19.1.8

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React Server Components

v19.1.7

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React Server Components

[v19.1.6](https://redirect.github.com/react/react/blob/HEAD/CHANGELOG.md#1916-Marc

❗ Important

✂ PR body was truncated to here.


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@renovate-sh-app
renovate-sh-app Bot requested a review from a team as a code owner October 12, 2026 02:19
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renovate-sh-app Bot commented Oct 12, 2026 •

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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

  • any of the package files in this branch needs updating, or
  • the branch becomes conflicted, or
  • you click the rebase/retry checkbox if found above, or
  • you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: ui/mcp-apps/package-lock.json
npm warn Unknown env config "store". This will error in a future major version of npm. See `npm help npmrc` for supported config options.
npm error code ERESOLVE
npm error ERESOLVE could not resolve
npm error
npm error While resolving: @types/react-dom@18.3.7
npm error Found: @types/react@19.3.0
npm error node_modules/@types/react
npm error   dev @types/react@"19.3.0" from the root project
npm error   peerOptional @types/react@"^18.0.0 || ^19.0.0" from @testing-library/react@16.3.3
npm error   node_modules/@testing-library/react
npm error     dev @testing-library/react@"16.3.3" from the root project
npm error
npm error Could not resolve dependency:
npm error peer @types/react@"^18.0.0" from @types/react-dom@18.3.7
npm error node_modules/@types/react-dom
npm error   dev @types/react-dom@"18.3.7" from the root project
npm error   peerOptional @types/react-dom@"^18.0.0 || ^19.0.0" from @testing-library/react@16.3.3
npm error   node_modules/@testing-library/react
npm error     dev @testing-library/react@"16.3.3" from the root project
npm error
npm error Conflicting peer dependency: @types/react@18.3.31
npm error node_modules/@types/react
npm error   peer @types/react@"^18.0.0" from @types/react-dom@18.3.7
npm error   node_modules/@types/react-dom
npm error     dev @types/react-dom@"18.3.7" from the root project
npm error     peerOptional @types/react-dom@"^18.0.0 || ^19.0.0" from @testing-library/react@16.3.3
npm error     node_modules/@testing-library/react
npm error       dev @testing-library/react@"16.3.3" from the root project
npm error
npm error Fix the upstream dependency conflict, or retry this command with --force or --legacy-peer-deps to accept an incorrect (and potentially broken) dependency resolution.
npm error
npm error
npm error For a full report see:
npm error /tmp/renovate/cache/others/npm/_logs/2026-10-17T20_14_07_877Z-eresolve-report.txt
npm error A complete log of this run can be found in: /tmp/renovate/cache/others/npm/_logs/2026-10-17T20_14_07_877Z-debug-0.log

@github-actions github-actions Bot added the cla: yes Contributor License Agreement is signed label Oct 12, 2026

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Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

Fix All in Cursor

❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.

Reviewed by Cursor Bugbot for commit 9db34a4. Configure here.

Comment thread ui/mcp-apps/package.json Outdated
"@types/react-dom": "18.3.7",
"jsdom": "^30.0.0",
"react": "18.3.1",
"react": "19.3.0",

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React 19 upgraded without matching react-dom

High Severity

react and @types/react are now pinned to 19.3.0, but react-dom stays at 18.3.1 and @types/react-dom at 18.3.7. Those packages must share a major version; react-dom@18.3.1 only accepts react@^18.3.1, so hooks and createRoot typically crash at runtime. The lockfile still records React 18, so installs stay inconsistent.

Fix in Cursor Fix in Web

Reviewed by Cursor Bugbot for commit 9db34a4. Configure here.

@renovate-sh-app
renovate-sh-app Bot force-pushed the renovate/react-19.x branch from 9db34a4 to 2b6ee54 Compare October 15, 2026 11:22
@renovate-sh-app
renovate-sh-app Bot force-pushed the renovate/react-19.x branch from 2b6ee54 to 675d383 Compare October 17, 2026 20:14
Renovate bumped react and @types/react to 19 without react-dom, which
must match react's version exactly. Bump react-dom and @types/react-dom
too, refresh the lockfile and rebuild the embedded UI bundles.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@cursor

cursor Bot commented Oct 18, 2026

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This PR is too large for Bugbot to review. It changes 218 lines and 3,354,210 characters. Split the change into smaller pull requests to get a review.

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Edited/Blocked Notification

Renovate will not automatically rebase this PR, because it does not recognize the last commit author and assumes somebody else may have edited the PR.

You can manually request rebase by checking the rebase/retry box above.

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@sd2k

sd2k commented Oct 18, 2026

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Pushed 67a4369: Renovate bumped react/@types/react to 19 without react-dom (the groupName: null major rule in renovate.json defeats the React monorepo grouping), so npm ci failed. Bumped react-dom/@types/react-dom to 19.3.x, refreshed the lockfile, and rebuilt ui/mcp-apps/dist. Typecheck and 114 vitest tests pass.

Needs human review: this is a React major, and React is bundled into the embedded MCP app UIs (trace/metrics), so it changes runtime behaviour in hosts. Worth a quick manual check of the trace and metrics apps before merging. Auto-merge not enabled. Also note react 19.3.1 was published 2026-10-14, inside the 14-day minimumReleaseAge.

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