Core: Improve addon detection in automigrations on windows

[mrginglymus]

Addon detection is done by sniffing the value returned by getAddonNames, which pulls values from storybook config.

However, the wrap-require automation wraps addon references in an absolute path resolver.

On windows this means that addons are now reported as e.g. @storybook\\addon-a11y, which defeats detection

Closes #31936

What I did

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
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Documentation

• Add or update documentation reflecting your changes
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  MIGRATION.MD

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• 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

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  • bug: Internal changes that fixes incorrect behavior.
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Greptile Summary

Fixed addon detection in Storybook automigrations for Windows environments by normalizing path separators.

• Modified code/core/src/common/utils/get-addon-names.ts to handle Windows-style backslash path separators
• Fixed issue where addons like @storybook\addon-a11y weren't being properly detected on Windows
• Ensures consistent addon path handling across different operating systems
• Maintains compatibility with the wrap-require automation system

[greptile-apps]

LGTM

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---

☁️ Nx Cloud last updated this comment at 2025-07-08 20:35:15 UTC

[mrginglymus]

Whoops, didn't actually fix getAddonNames correctly. the addonA11yAddonTest checks has

const hasA11yAddon = !!addons.find((addon) => addon.includes('@storybook/addon-a11y'));

which threw me off. It presumably should be

const hasA11yAddon = addons.includes('@storybook/addon-a11y');

[storybook-pr-benchmarking]

Package Benchmarks

^{Commit: e0e4a3d, ran on 11 August 2025 at 11:40:59 UTC}

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

@storybook/addon-docs

	Before	After	Difference
Dependency count	12	12	0
Self size	2.47 MB	2.42 MB	🎉 -53 KB 🎉
Dependency size	8.93 MB	8.93 MB	🚨 +1 B 🚨
Bundle Size Analyzer	Link	Link

storybook

	Before	After	Difference
Dependency count	51	46	🎉 -5 🎉
Self size	41.74 MB	31.73 MB	🎉 -10.00 MB 🎉
Dependency size	18.13 MB	17.37 MB	🎉 -762 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/react-native-web-vite

	Before	After	Difference
Dependency count	163	161	🎉 -2 🎉
Self size	32 KB	35 KB	🚨 +3 KB 🚨
Dependency size	23.68 MB	23.62 MB	🎉 -62 KB 🎉
Bundle Size Analyzer	Link	Link

@storybook/vue3-vite

	Before	After	Difference
Dependency count	105	104	🎉 -1 🎉
Self size	34 KB	34 KB	0 B
Dependency size	43.55 MB	43.49 MB	🎉 -51 KB 🎉
Bundle Size Analyzer	Link	Link

sb

	Before	After	Difference
Dependency count	52	47	🎉 -5 🎉
Self size	1 KB	1 KB	0 B
Dependency size	59.87 MB	49.10 MB	🎉 -10.77 MB 🎉
Bundle Size Analyzer	Link	Link

@storybook/cli

	Before	After	Difference
Dependency count	220	216	🎉 -4 🎉
Self size	585 KB	582 KB	🎉 -3 KB 🎉
Dependency size	104.37 MB	93.68 MB	🎉 -10.69 MB 🎉
Bundle Size Analyzer	Link	Link

@storybook/codemod

	Before	After	Difference
Dependency count	189	185	🎉 -4 🎉
Self size	31 KB	31 KB	0 B
Dependency size	88.45 MB	77.77 MB	🎉 -10.68 MB 🎉
Bundle Size Analyzer	Link	Link

create-storybook

	Before	After	Difference
Dependency count	1	1	0
Self size	12.52 MB	12.50 MB	🎉 -15 KB 🎉
Dependency size	98 KB	98 KB	0 B
Bundle Size Analyzer	Link	Link