Nextjs: Fix config access for Vite

[valentinpalkovic]

Closes #32743

What I did

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.
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  • feature request: Introducing a new feature.
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🦋 Canary release

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Summary by CodeRabbit

• Chores
  • Updated the build configuration so preview support is included in the published build.

[coderabbitai]

📝 Walkthrough

Walkthrough

Added "./src/config/preview.ts" to the bundler.entries array in code/frameworks/nextjs-vite/package.json, expanding the package's public build entry points. No other functional or behavioral changes.

Changes

Cohort / File(s)	Summary
Build entry point configuration code/frameworks/nextjs-vite/package.json	Added "./src/config/preview.ts" to the bundler.entries array

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• storybookjs/storybook#32547: Modifies the same bundler.entries configuration and package.json exports to expose ./config/preview in the nextjs-vite package.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch valentin/fix-next-vite

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between ea80f89 and 71995fc.

📒 Files selected for processing (1)

• code/frameworks/nextjs-vite/package.json (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• code/frameworks/nextjs-vite/package.json

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

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

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[storybook-bot]

Failed to publish canary version of this pull request, triggered by @vanessayuenn. See the failed workflow run at: https://github.com/storybookjs/storybook/actions/runs/18599415935

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 71995fc

Command	Status	Duration	Result
nx run-many -t build --parallel=3	✅ Succeeded	1m 18s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-10-17 18:16:15 UTC

[storybook-bot]

Failed to publish canary version of this pull request, triggered by @vanessayuenn. See the failed workflow run at: https://github.com/storybookjs/storybook/actions/runs/18599415935