Theming: Export interface declaration for ThemesGlobals

[icopp]

Relates to #32898

What I did

This interface has to be exported to prevent "Default export of the module has or is using private name" errors when attempting to use meta.story().

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

• Using a project with "composite": true
• Create a simple preview.tsx for a Storybook project, for example:

  import { definePreview } from "@storybook/nextjs";
  
  export default definePreview({
    addons: [
      addonThemes()
    ]
  });
  

• Create a simple story, for example:

  const meta = preview.meta({
    component: () => null
  });
  export default meta;
  
  export const SomeStory = meta.story();
  

• See that there is a type error for ThemesGlobals before this change, and no type error for ThemesGlobals after this change

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>

Summary by CodeRabbit

• New Features
  • Expanded public API with additional theme type exports now available for integration.
  • Decorator utilities are now directly accessible from the main addon export.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[nx-cloud]

View your CI Pipeline Execution ↗ for commit f8a0aaa

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---

☁️ Nx Cloud last updated this comment at 2025-12-24 09:54:56 UTC

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 339a6bc

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☁️ Nx Cloud last updated this comment at 2025-12-15 14:08:24 UTC

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 339a6bc

---

☁️ Nx Cloud last updated this comment at 2025-12-15 14:08:24 UTC

[storybook-app-bot]

Package Benchmarks

^{Commit: 2fb4ad6, ran on 20 January 2026 at 18:32:50 UTC}

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

@storybook/builder-webpack5

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Self size	75 KB	75 KB	🎉 -6 B 🎉
Dependency size	32.24 MB	32.25 MB	🚨 +11 KB 🚨
Bundle Size Analyzer	Link	Link

storybook

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Self size	20.30 MB	20.32 MB	🚨 +21 KB 🚨
Dependency size	16.52 MB	16.52 MB	🎉 -4 B 🎉
Bundle Size Analyzer	Link	Link

@storybook/ember

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Dependency count	196	196	0
Self size	15 KB	15 KB	🚨 +12 B 🚨
Dependency size	28.96 MB	28.97 MB	🚨 +11 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/nextjs

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Dependency count	538	538	0
Self size	646 KB	646 KB	🎉 -10 B 🎉
Dependency size	59.22 MB	59.73 MB	🚨 +505 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/nextjs-vite

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Dependency count	127	127	0
Self size	1.12 MB	1.12 MB	🚨 +50 B 🚨
Dependency size	21.82 MB	22.32 MB	🚨 +496 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/react-native-web-vite

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Dependency count	159	159	0
Self size	30 KB	30 KB	🚨 +8 B 🚨
Dependency size	23.00 MB	23.61 MB	🚨 +610 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/react-vite

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Dependency count	117	117	0
Self size	35 KB	35 KB	🚨 +10 B 🚨
Dependency size	19.62 MB	20.11 MB	🚨 +496 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/react-webpack5

	Before	After	Difference
Dependency count	278	278	0
Self size	24 KB	24 KB	🚨 +2 B 🚨
Dependency size	44.13 MB	44.64 MB	🚨 +505 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/server-webpack5

	Before	After	Difference
Dependency count	204	204	0
Self size	16 KB	16 KB	🎉 -10 B 🎉
Dependency size	33.49 MB	33.50 MB	🚨 +11 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/cli

	Before	After	Difference
Dependency count	183	183	0
Self size	775 KB	776 KB	🚨 +303 B 🚨
Dependency size	67.38 MB	67.47 MB	🚨 +92 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/codemod

	Before	After	Difference
Dependency count	176	176	0
Self size	30 KB	30 KB	🎉 -40 B 🎉
Dependency size	65.95 MB	66.05 MB	🚨 +92 KB 🚨
Bundle Size Analyzer	Link	Link

create-storybook

	Before	After	Difference
Dependency count	50	50	0
Self size	1000 KB	999 KB	🎉 -48 B 🎉
Dependency size	36.82 MB	36.84 MB	🚨 +21 KB 🚨
Bundle Size Analyzer	node	node

@storybook/preset-react-webpack

	Before	After	Difference
Dependency count	170	170	0
Self size	18 KB	18 KB	🚨 +18 B 🚨
Dependency size	31.26 MB	31.28 MB	🚨 +11 KB 🚨
Bundle Size Analyzer	Link	Link

@storybook/react

	Before	After	Difference
Dependency count	57	57	0
Self size	732 KB	1.23 MB	🚨 +494 KB 🚨
Dependency size	12.94 MB	12.94 MB	🚨 +2 KB 🚨
Bundle Size Analyzer	Link	Link

[icopp]

Just to note, I don't have permissions to merge this, so somebody else will have to do that.