Test: Remove unused util dependency

[JReinhold]

Works on #29038

What I did

@storybook/test and @storybook/instrumenter originally included the util package as a dependency, because otherwise building them would fail with:

Error: Build failed with 1 error:
../../node_modules/loupe/lib/index.js:30:29: ERROR: Could not read from file: /Users/jeppe/dev/work/storybook/storybook/code/lib/node_modules/util/util.js

That's because loupe does require('util'). But it does so conditionally, as the whole point of loupe is to add support for inspect across Node and browsers, so it's fine if util isn't present. Our builder doesn't know that of course - causing the error, but marking util as external instead fixes that problem.

util is still a dependency of @storybook/core, but this is a low-effort step in the right direction.

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/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>

name	before	after	diff	z	%
createSize	0 B	0 B	0 B	-	-
generateSize	78.7 MB	78.7 MB	1.67 kB	0.75	0%
initSize	148 MB	148 MB	1.68 kB	-2.45	0%
diffSize	69.3 MB	69.3 MB	10 B	-2.35	0%
buildSize	6.79 MB	6.79 MB	0 B	2.96	0%
buildSbAddonsSize	1.5 MB	1.5 MB	0 B	-	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	1.83 MB	1.83 MB	0 B	0.5	0%
buildSbPreviewSize	270 kB	270 kB	0 B	-	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	3.8 MB	3.8 MB	0 B	0.5	0%
buildPreviewSize	2.99 MB	2.99 MB	0 B	3	0%
testBuildSize	0 B	0 B	0 B	-	-
testBuildSbAddonsSize	0 B	0 B	0 B	-	-
testBuildSbCommonSize	0 B	0 B	0 B	-	-
testBuildSbManagerSize	0 B	0 B	0 B	-	-
testBuildSbPreviewSize	0 B	0 B	0 B	-	-
testBuildStaticSize	0 B	0 B	0 B	-	-
testBuildPrebuildSize	0 B	0 B	0 B	-	-
testBuildPreviewSize	0 B	0 B	0 B	-	-

name	before	after	diff	z	%
createTime	11.3s	21.4s	10.1s	1.47	🔺47.1%
generateTime	19.7s	22.4s	2.7s	0.56	12.2%
initTime	12.8s	14.3s	1.4s	-0.32	10.3%
buildTime	8.9s	8.8s	-78ms	-0.53	-0.9%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	6.7s	6.4s	-323ms	-0.62	-5%
devManagerResponsive	4.6s	4.2s	-402ms	-0.7	-9.6%
devManagerHeaderVisible	616ms	660ms	44ms	0.7	6.7%
devManagerIndexVisible	647ms	690ms	43ms	0.62	6.2%
devStoryVisibleUncached	815ms	1.1s	366ms	0.06	31%
devStoryVisible	648ms	691ms	43ms	0.61	6.2%
devAutodocsVisible	537ms	649ms	112ms	1.88	🔺17.3%
devMDXVisible	530ms	473ms	-57ms	-0.66	-12.1%
buildManagerHeaderVisible	831ms	583ms	-248ms	0.15	-42.5%
buildManagerIndexVisible	856ms	586ms	-270ms	0.03	-46.1%
buildStoryVisible	857ms	619ms	-238ms	0.06	-38.4%
buildAutodocsVisible	477ms	508ms	31ms	0.12	6.1%
buildMDXVisible	466ms	511ms	45ms	0.06	8.8%

Greptile Summary

This PR removes the unused 'util' dependency from multiple Storybook packages and marks it as external in the bundler configuration.

• Removed 'util' dependency from '@storybook/instrumenter' and '@storybook/test' packages
• Added 'util' to the 'externals' array in bundler configuration for affected packages
• Removed 'chai' dependency from '@storybook/core' package
• These changes are part of a broader effort to reduce Storybook's install footprint (Issue [Tracking] Reduce install footprint 🐾 #29038)

[greptile-apps]

LGTM

_{3 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings}

[nx-cloud]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit a6b2f30. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this CI Pipeline Execution

---

✅ Successfully ran 2 targets

• nx affected -t check -c production --parallel=7
• nx run-many -t build -c production --parallel=3

---

Sent with 💌 from NxCloud.

[kasperpeulen]

LGTM!