Build: Use rolldown instead of rollup for dts generation

[valentinpalkovic]

Closes #

What I did

Use rolldown and the rolldown DTS plugin to build DTS files.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook publish.yml --field pr=<PR_NUMBER>

[coderabbitai]

Important

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch valentin/use-rolldown-for-dts-generation

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 4a23a97

Command	Status	Duration	Result
nx run-many -t build --parallel=3	✅ Succeeded	48s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-10-29 10:57:41 UTC

[storybook-app-bot]

Package Benchmarks

^{Commit: 4a23a97, ran on 29 October 2025 at 10:47:12 UTC}

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

@storybook/addon-docs

	Before	After	Difference
Dependency count	18	18	0
Self size	1.88 MB	1.87 MB	🎉 -15 KB 🎉
Dependency size	10.21 MB	10.21 MB	🚨 +76 B 🚨
Bundle Size Analyzer	Link	Link

storybook

	Before	After	Difference
Dependency count	43	43	0
Self size	22.93 MB	21.27 MB	🎉 -1.66 MB 🎉
Dependency size	17.36 MB	17.36 MB	0 B
Bundle Size Analyzer	Link	Link

@storybook/ember

	Before	After	Difference
Dependency count	191	191	0
Self size	17 KB	15 KB	🎉 -2 KB 🎉
Dependency size	28.61 MB	28.61 MB	🚨 +308 B 🚨
Bundle Size Analyzer	Link	Link

@storybook/nextjs

	Before	After	Difference
Dependency count	532	532	0
Self size	749 KB	727 KB	🎉 -22 KB 🎉
Dependency size	58.50 MB	58.48 MB	🎉 -22 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/nextjs-vite

	Before	After	Difference
Dependency count	124	124	0
Self size	3.83 MB	3.81 MB	🎉 -22 KB 🎉
Dependency size	21.54 MB	21.52 MB	🎉 -22 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react-native-web-vite

	Before	After	Difference
Dependency count	157	157	0
Self size	31 KB	31 KB	🚨 +25 B 🚨
Dependency size	22.92 MB	22.90 MB	🎉 -22 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react-vite

	Before	After	Difference
Dependency count	114	114	0
Self size	37 KB	37 KB	🎉 -227 B 🎉
Dependency size	19.48 MB	19.46 MB	🎉 -22 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react-webpack5

	Before	After	Difference
Dependency count	272	272	0
Self size	25 KB	25 KB	🚨 +41 B 🚨
Dependency size	43.46 MB	43.43 MB	🎉 -22 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/cli

	Before	After	Difference
Dependency count	187	187	0
Self size	928 KB	928 KB	0 B
Dependency size	72.88 MB	71.22 MB	🎉 -1.66 MB 🎉
Bundle Size Analyzer	Link	Link

@storybook/codemod

	Before	After	Difference
Dependency count	169	169	0
Self size	35 KB	35 KB	🚨 +35 B 🚨
Dependency size	69.31 MB	67.65 MB	🎉 -1.66 MB 🎉
Bundle Size Analyzer	Link	Link

create-storybook

	Before	After	Difference
Dependency count	44	44	0
Self size	1.55 MB	1.55 MB	🎉 -30 B 🎉
Dependency size	40.29 MB	38.63 MB	🎉 -1.66 MB 🎉
Bundle Size Analyzer	node	node

@storybook/react

	Before	After	Difference
Dependency count	2	2	0
Self size	627 KB	605 KB	🎉 -22 KB 🎉
Dependency size	28 KB	28 KB	🚨 +45 B 🚨
Bundle Size Analyzer	Link	Link