React: Simplify version detection

[mrginglymus]

What I did

Don't pull in the fairly chunky semver library to do a trivial major/minor parse + check.

Before:

After:

60kb saved

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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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.
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Summary by CodeRabbit

• Chores

  • Removed two development dependencies to slim developer tooling.

• Refactor

  • Reworked internal React version parsing; preserved existing compatibility checks and user-facing behavior.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit ca35a93

Command	Status	Duration	Result
nx run-many -t build --parallel=3	✅ Succeeded	49s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-10-26 10:41:38 UTC

[coderabbitai]

📝 Walkthrough

Walkthrough

Removed the semver package and its type definitions from the React renderer's devDependencies and replaced semver-based React.version parsing in entry-preview.tsx with manual string-splitting and integer parsing, keeping the same React >= 18.3 compatibility check.

Changes

Cohort / File(s)	Change Summary
Dependency removal code/renderers/react/package.json	Removed devDependencies: @types/semver and semver.
Version parsing refactor code/renderers/react/src/entry-preview.tsx	Replaced semver-based parsing with manual React.version.split('.') and parseInt parsing; added guard that throws "Unable to parse React version" if major/minor are not integers; retained existing React >= 18.3 check and behavior.

Sequence Diagram(s)

sequenceDiagram
    participant Entry as entry-preview.tsx
    participant React as React (runtime)

    rect rgb(220, 240, 255)
    Note over Entry,React: Version extraction & check (new manual parse)
    Entry->>React: read React.version (string)
    Entry->>Entry: split('.') -> parts
    Entry->>Entry: parseInt(parts[0]) -> major
    Entry->>Entry: parseInt(parts[1]) -> minor
    alt parse failed
        Entry-->>Entry: throw "Unable to parse React version"
    else parsed
        alt version < 18.3
            Entry-->>Entry: throw unsupported RSC error
        else version >= 18.3
            Entry->>Entry: continue initialization
        end
    end
    end

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Pay attention to the parsing guard and error message in entry-preview.tsx.
• Confirm no other files depend on the removed semver devDependency.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📥 Commits

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• code/renderers/react/package.json

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Package Benchmarks

^{Commit: ca35a93, ran on 26 October 2025 at 10:40:35 UTC}

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

@storybook/nextjs

	Before	After	Difference
Dependency count	532	532	0
Self size	950 KB	951 KB	🚨 +89 B 🚨
Dependency size	58.77 MB	58.70 MB	🎉 -65 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/nextjs-vite

	Before	After	Difference
Dependency count	124	124	0
Self size	4.10 MB	4.03 MB	🎉 -66 KB 🎉
Dependency size	21.81 MB	21.74 MB	🎉 -65 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	23.19 MB	23.13 MB	🎉 -65 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	19.75 MB	19.68 MB	🎉 -65 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react-webpack5

	Before	After	Difference
Dependency count	272	272	0
Self size	25 KB	25 KB	0 B
Dependency size	43.72 MB	43.66 MB	🎉 -65 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react

	Before	After	Difference
Dependency count	2	2	0
Self size	894 KB	829 KB	🎉 -65 KB 🎉
Dependency size	28 KB	28 KB	0 B
Bundle Size Analyzer	Link	Link