Build: Remove vite-plus as devDependency

[huang-julien]

Closes #34548

What I did

Vite plus as a dev deps was overriding the oxfmt package by injecting the vendored one.

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

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Caution

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>

Summary by CodeRabbit

Release Notes

• Chores
  • Transitioned vite-plus from a required dev dependency to an optional peer dependency, reducing unnecessary package installations
  • Updated code to gracefully handle optional peer dependency resolution

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 7c14123

Command	Status	Duration	Result
nx run-many -t compile,check,knip,test,lint,fmt...	✅ Succeeded	9m 24s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-04-15 11:24:46 UTC

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1cab0c39-271c-43b7-8f5e-66830b208b2a

📥 Commits

Reviewing files that changed from the base of the PR and between a168d41 and 7c14123.

⛔ Files ignored due to path filters (1)

• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (2)

• code/core/package.json
• code/core/src/common/js-package-manager/vite-plus-versions.ts

💤 Files with no reviewable changes (1)

• code/core/package.json

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📝 Walkthrough

Walkthrough

Removed vite-plus from devDependencies while maintaining it as a peer dependency, and added a TypeScript suppression comment to acknowledge that the dynamic import of vite-plus/versions may fail at type-check time.

Changes

Cohort / File(s)	Summary
TypeScript Error Suppression code/core/src/common/js-package-manager/vite-plus-versions.ts	Added // @ts-expect-error`` comment before dynamic import of vite-plus/versions to suppress type-checking errors when the module is unavailable.
Dependency Management code/core/package.json	Removed vite-plus from devDependencies while keeping it declared as an optional peer dependency.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Fix: Add vite-plus vendored libraries version detection #34509: Introduced vite-plus detection logic in the same module that this PR updates by removing the dev dependency and adding appropriate error suppression.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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