Core: Delete shim addon packages

[ndelangen]

What I did

I deleted the shim packages for addons from the monorepo.

Because they have 0 dependencies, and all they do is cause an error/warning to happen.. there's no reason for these packages to ever change anymore.

Publishing the same code over and over again is a waste.

Furthermore, we want to actually mark these packages as deprecated on the npm registry. We cannot do that effectively if we keep publishing new versions.

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.
  • 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 canary-release-pr.yml --field pr=<PR_NUMBER>

Greptile Summary

Removes deprecated shim addon packages from the Storybook monorepo as part of the v9.0 consolidation effort.

• Removes shim packages for actions, backgrounds, controls, measure, outline, toolbars, and viewport addons that only served to display deprecation warnings
• Enables proper deprecation marking of these packages on npm registry by stopping continuous republishing
• Aligns with v9.0 migration where these addons are now accessed directly from the core package (e.g., storybook/viewport instead of @storybook/addon-viewport)
• Reduces maintenance overhead by removing redundant packages with zero dependencies
• Supports cleaner migration path by leveraging npm's built-in deprecation mechanism

[Copilot]

Pull Request Overview

Removes deprecated shim packages for the controls, backgrounds, and actions addons to stop re-publishing unused stubs.

• Deletes entire directories and files for shimmed addons (package.json, source stubs, configs)
• Eliminates the error stubs that provided migration guidance upon import
• Cleans up build/preview/manager entry points for these addons

Reviewed Changes

Copilot reviewed 63 out of 63 changed files in this pull request and generated no comments.

File	Description
code/addons/controls/**	All shim package files removed
code/addons/backgrounds/**	All shim package files removed
code/addons/actions/**	All shim package files removed

Comments suppressed due to low confidence (1)

code/addons/backgrounds/src/error.ts:1

• Removing these error stubs will cause users who still import the old addon to see a generic module-not-found error instead of a clear migration message. Consider keeping a minimal stub that throws a descriptive error pointing to the migration guide.

throw new Error(

[greptile-apps]

LGTM

_{63 files reviewed, no comments
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[nx-cloud]

View your CI Pipeline Execution ↗ for commit dac6a1a.

Command	Status	Duration	Result
nx run-many -t build --parallel=3	✅ Succeeded	1m 26s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-06-10 15:12:43 UTC

[shilman]

Woohoo!!!