Fix: Export interface declaration for ReactMeta

[icopp]

Relates to #32898

What I did

This interface has to be exported to prevent has or is using name '...' from external module "..." but cannot be named errors when attempting to use definePreview(...).meta(...).

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

1. Create a simple preview.tsx for a Storybook project, for example:

   import { definePreview } from "@storybook/nextjs";
   
   export default definePreview({});
   

   (Note that CSF: Fix export interface declaration for NextPreview #32914 is necessary to avoid a type error at this point.)
2. Create a simple whatever.stories.tsx, for example:

   import preview from "@/.storybook/preview";
   
   const meta = preview.meta({
     component: () => null,
     title: "Some Component"
   });
   

3. See that there is a type error before this change, and (if CSF: Fix export interface declaration for NextPreview #32914 is also included) no type error 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>

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📝 Walkthrough

Walkthrough

The ReactMeta interface in the React renderer preview module is now exported as a public type, making it accessible to external consumers. No functional changes to the interface implementation or structure.

Changes

Cohort / File(s)	Summary
React Meta Export code/renderers/react/src/preview.tsx	Export visibility added to ReactMeta interface declaration; type signature remains unchanged

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

✨ Finishing touches

• 📝 Generate docstrings

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📥 Commits

Reviewing files that changed from the base of the PR and between 5d0ff07 and 80e50d1.

📒 Files selected for processing (1)

• code/renderers/react/src/preview.tsx (1 hunks)

🧰 Additional context used

📓 Path-based instructions (4)

**/*.{js,jsx,json,html,ts,tsx,mjs}

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**/*.{js,jsx,json,html,ts,tsx,mjs}: Run Prettier formatting on changed files before committing
Run ESLint on changed files and fix all errors/warnings before committing (use yarn lint:js:cmd <file>)

Files:

• code/renderers/react/src/preview.tsx

**/*.{ts,tsx,js,jsx,mjs}

📄 CodeRabbit inference engine (.github/copilot-instructions.md)

Export functions from modules when they need to be unit-tested

Files:

• code/renderers/react/src/preview.tsx

code/**/*.{ts,tsx,js,jsx,mjs}

📄 CodeRabbit inference engine (.github/copilot-instructions.md)

In application code, use Storybook loggers instead of console.* (client code: storybook/internal/client-logger; server code: storybook/internal/node-logger)

Files:

• code/renderers/react/src/preview.tsx

{code/**,scripts/**}/**/*.{ts,tsx,js,jsx,mjs}

📄 CodeRabbit inference engine (.github/copilot-instructions.md)

Do not use console.log, console.warn, or console.error directly unless in isolated files where importing loggers would significantly increase bundle size

Files:

• code/renderers/react/src/preview.tsx

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• GitHub Check: Danger JS
• GitHub Check: Core Unit Tests, windows-latest
• GitHub Check: normal

🔇 Additional comments (1)

code/renderers/react/src/preview.tsx (1)

87-87: LGTM! Correct fix for TypeScript visibility issue.

Exporting the ReactMeta interface is the proper solution for the "cannot be named" TypeScript error. Since this interface is returned by the public ReactPreview.meta() method (line 72), it must be exported so TypeScript can properly reference it in declaration files. This change also improves consistency with other exported interfaces like ReactPreview and ReactStory.

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---

☁️ Nx Cloud last updated this comment at 2025-11-03 14:44:32 UTC

[yannbf]

Thank you <3

[storybook-app-bot]

Package Benchmarks

^{Commit: 80e50d1, ran on 6 November 2025 at 15:23:25 UTC}

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

@storybook/nextjs

	Before	After	Difference
Dependency count	533	533	0
Self size	749 KB	749 KB	🚨 +108 B 🚨
Dependency size	58.93 MB	58.91 MB	🎉 -20 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/nextjs-vite

	Before	After	Difference
Dependency count	124	124	0
Self size	3.83 MB	3.83 MB	🎉 -250 B 🎉
Dependency size	21.87 MB	21.85 MB	🎉 -20 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	0 B
Dependency size	23.11 MB	23.09 MB	🎉 -20 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react-vite

	Before	After	Difference
Dependency count	114	114	0
Self size	37 KB	37 KB	0 B
Dependency size	19.67 MB	19.65 MB	🎉 -20 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react-webpack5

	Before	After	Difference
Dependency count	273	273	0
Self size	25 KB	25 KB	0 B
Dependency size	43.89 MB	43.87 MB	🎉 -20 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react

	Before	After	Difference
Dependency count	57	57	0
Self size	833 KB	812 KB	🎉 -20 KB 🎉
Dependency size	12.92 MB	12.92 MB	0 B
Bundle Size Analyzer	Link	Link