Core: Boot Vitest runner when hovering the Testing Module

[ghengeveld]

Adds a new TESTING_MODULE_BOOT_REQUEST event which is emitted when hovering the Testing Module. The Vitest manager is booted when this event fires, so that it's ready when a test run is started. This saves about 1.5-2 seconds on my Macbook Pro M1.

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>

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buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	4.1 MB	4.1 MB	623 B	0.85	0%
buildPreviewSize	3 MB	3 MB	0 B	0.26	0%
testBuildSize	0 B	0 B	0 B	-	-
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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	19.3s	18s	-1s -288ms	0.74	-7.1%
generateTime	20.1s	21.5s	1.4s	-0.28	6.5%
initTime	14s	13.4s	-569ms	-0.71	-4.2%
buildTime	8.5s	8s	-457ms	-1.16	-5.7%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	5.6s	6s	362ms	-0.43	6%
devManagerResponsive	3.8s	4.1s	276ms	0.33	6.7%
devManagerHeaderVisible	513ms	654ms	141ms	0.8	21.6%
devManagerIndexVisible	545ms	695ms	150ms	0.91	21.6%
devStoryVisibleUncached	926ms	1.3s	398ms	2.77	🔺30.1%
devStoryVisible	546ms	696ms	150ms	0.93	21.6%
devAutodocsVisible	519ms	619ms	100ms	0.93	16.2%
devMDXVisible	453ms	551ms	98ms	0.56	17.8%
buildManagerHeaderVisible	508ms	513ms	5ms	-0.92	1%
buildManagerIndexVisible	568ms	551ms	-17ms	-0.92	-3.1%
buildStoryVisible	569ms	552ms	-17ms	-1.07	-3.1%
buildAutodocsVisible	500ms	473ms	-27ms	-1.14	-5.7%
buildMDXVisible	449ms	511ms	62ms	-0.35	12.1%

Greptile Summary

This pull request introduces a new event TESTING_MODULE_BOOT_REQUEST to improve the performance of the Vitest runner in Storybook. The key changes include:

• Added TESTING_MODULE_BOOT_REQUEST event to code/core/src/core-events/index.ts
• Implemented event listener for TESTING_MODULE_BOOT_REQUEST in code/addons/test/src/preset.ts
• Integrated bootTestProviders function in SidebarBottom component to emit the new event on hover
• Updated code/core/src/manager/globals/exports.ts to include the new event in globalized dependencies
• Modified execute function in test preset to accept an optional eventName parameter

These changes aim to preemptively boot the Vitest runner when hovering over the Testing Module, potentially saving 1.5-2 seconds of loading time.

[greptile-apps]

_{4 file(s) reviewed, 1 comment(s)
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[valentinpalkovic]

Rebased, since tests were failing. Otherwise, LGTM