Release: Prerelease rc 10.0.0-rc.0

[github-actions]

This is an automated pull request that bumps the version from 10.0.0-beta.13 to 10.0.0-rc.0.
Once this pull request is merged, it will trigger a new release of version 10.0.0-rc.0.
If you're not a core maintainer with permissions to release you can ignore this pull request.

To do

Before merging the PR, there are a few QA steps to go through:

• Add the "freeze" label to this PR, to ensure it doesn't get automatically forced pushed by new changes.
• Add the "ci:daily" label to this PR, to trigger the full test suite to run on this PR.

And for each change below:

1. Ensure the change is appropriate for the version bump. E.g. patch release should only contain patches, not new or de-stabilizing features. If a change is not appropriate, revert the PR.
2. Ensure the PR is labeled correctly with one of: "BREAKING CHANGE", "feature request", "bug", "maintenance", "dependencies", "documentation", "build", "unknown".
3. Ensure the PR title is correct, and follows the format "[Area]: [Summary]", e.g. "React: Fix hooks in CSF3 render functions". If it is not correct, change the title in the PR.
   • Areas include: React, Vue, Core, Docs, Controls, etc.
   • First word of summary indicates the type: “Add”, “Fix”, “Upgrade”, etc.
   • The entire title should fit on a line

This is a list of all the PRs merged and commits pushed directly to next, that will be part of this release:

• 🐛 Bug: A11Y: Bugfix missing manager.js entry-file #32780
• 🐛 Bug: CLI: Change message in downgrade-blocker #32745
• 🐛 Bug: Addon Vitest: Support modifying mergeConfig on addon setup #32753
• 🏗️ Build: Build: Use next version of test-runner #32773
• 📝 Documentation: Docs: Update monorepo contribution guide #32769
• 📝 Documentation: Docs: Adjust Addon jest location #32755 (will also be patched)
• 📝 Documentation: Docs: Update addon migration guide for 10.0 #32714

If you've made any changes doing the above QA (change PR titles, revert PRs), manually trigger a re-generation of this PR with this workflow and wait for it to finish. It will wipe your progress in this to do, which is expected.

Feel free to manually commit any changes necessary to this branch after you've done the last re-generation, following the Make Manual Changes section in the docs, especially if you're making changes to the changelog.

When everything above is done:

• Merge this PR
• Follow the run of the publish action

---

Generated changelog

10.0.0-rc.0

• A11Y: Bugfix missing manager.js entry-file - #32780, thanks ndelangen!
• Addon Vitest: Support modifying mergeConfig on addon setup - #32753, thanks yannbf!
• CLI: Change message in downgrade-blocker - #32745, thanks ndelangen!

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[nx-cloud]

View your CI Pipeline Execution ↗ for commit 7630168

Command	Status	Duration	Result
nx run-many -t check -c production --parallel=7	✅ Succeeded	1s	View ↗
nx run-many -t build -c production --parallel=3	✅ Succeeded	2s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-10-21 11:22:33 UTC

[storybook-app-bot]

Package Benchmarks

^{Commit: 7630168, ran on 21 October 2025 at 11:31:35 UTC}

The following packages have significant changes to their size or dependencies:

@storybook/builder-webpack5

	Before	After	Difference
Dependency count	187	187	0
Self size	68 KB	68 KB	0 B
Dependency size	31.88 MB	31.89 MB	🚨 +10 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/angular

	Before	After	Difference
Dependency count	187	187	0
Self size	126 KB	126 KB	0 B
Dependency size	30.01 MB	30.02 MB	🚨 +10 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/ember

	Before	After	Difference
Dependency count	191	191	0
Self size	17 KB	17 KB	0 B
Dependency size	28.59 MB	28.61 MB	🚨 +10 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/nextjs

	Before	After	Difference
Dependency count	532	532	0
Self size	950 KB	950 KB	0 B
Dependency size	58.59 MB	58.60 MB	🚨 +10 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/react-webpack5

	Before	After	Difference
Dependency count	272	272	0
Self size	25 KB	25 KB	0 B
Dependency size	43.55 MB	43.56 MB	🚨 +10 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/server-webpack5

	Before	After	Difference
Dependency count	199	199	0
Self size	17 KB	17 KB	0 B
Dependency size	33.13 MB	33.14 MB	🚨 +10 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/cli

	Before	After	Difference
Dependency count	187	187	0
Self size	927 KB	927 KB	🎉 -150 B 🎉
Dependency size	79.96 MB	79.97 MB	🚨 +11 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/codemod

	Before	After	Difference
Dependency count	169	169	0
Self size	35 KB	35 KB	0 B
Dependency size	76.39 MB	76.40 MB	🚨 +10 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/preset-react-webpack

	Before	After	Difference
Dependency count	170	170	0
Self size	21 KB	21 KB	0 B
Dependency size	31.04 MB	31.05 MB	🚨 +10 KB 🚨
Bundle Size Analyzer	Link	Link