SvelteKit: Introduce portable stories support

[yannbf]

Closes #28892

What I did

This PR introduces the ability to use SvelteKit in portable stories, therefore being able to use the Vitest addon plugin with it.

For that, you must configure the plugin that comes in the vite export of sveltekit:

import { defineWorkspace, defaultExclude } from "vitest/config";
import { storybookTest } from "@storybook/experimental-addon-vitest/plugin";
import { storybookSveltekitPlugin } from "@storybook/sveltekit/vite";

export default defineWorkspace([
  {
    extends: "vite.config.ts",
    plugins: [
      storybookTest({
        storybookScript: "yarn storybook --ci",
      }),
      storybookSveltekitPlugin(),
    ],
})

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	76.3 MB	76.3 MB	0 B	-0.71	0%
initSize	169 MB	169 MB	0 B	-0.71	0%
diffSize	92.7 MB	92.7 MB	0 B	0.71	0%
buildSize	7.46 MB	7.46 MB	0 B	0.71	0%
buildSbAddonsSize	1.61 MB	1.61 MB	0 B	-	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	2.3 MB	2.3 MB	0 B	-	0%
buildSbPreviewSize	351 kB	351 kB	0 B	-	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	4.46 MB	4.46 MB	0 B	-	0%
buildPreviewSize	3 MB	3 MB	0 B	0.71	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	7.3s	25.2s	17.8s	1.11	70.7%
generateTime	21.5s	22.2s	627ms	3.2	2.8%
initTime	20s	20.9s	852ms	1.67	4.1%
buildTime	13.7s	14.1s	429ms	1.31	3%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	7.3s	7.3s	-7ms	1.24	-0.1%
devManagerResponsive	4.8s	5s	200ms	2.09	3.9%
devManagerHeaderVisible	750ms	819ms	69ms	4.45	🔺8.4%
devManagerIndexVisible	758ms	852ms	94ms	4.7	🔺11%
devStoryVisibleUncached	1.2s	1.3s	100ms	1.44	🔺7.1%
devStoryVisible	789ms	853ms	64ms	3.94	🔺7.5%
devAutodocsVisible	733ms	676ms	-57ms	0.27	-8.4%
devMDXVisible	805ms	702ms	-103ms	-0.14	-14.7%
buildManagerHeaderVisible	716ms	718ms	2ms	1.42	0.3%
buildManagerIndexVisible	725ms	719ms	-6ms	0.7	-0.8%
buildStoryVisible	796ms	752ms	-44ms	0.38	-5.9%
buildAutodocsVisible	637ms	606ms	-31ms	-3.1	🔰-5.1%
buildMDXVisible	692ms	695ms	3ms	0.79	0.4%

Greptile Summary

This PR introduces portable stories support for SvelteKit in Storybook, enabling the use of the Vitest addon plugin.

• Added storybookSveltekitPlugin in code/frameworks/sveltekit/src/vite.ts for SvelteKit integration
• Updated package.json to include new 'vite' export and bundler entries
• Modified sandbox templates to support SvelteKit in portable stories
• Removed 'vitest-integration' from skipTasks for SvelteKit templates in sandbox-templates.ts
• Increased parallelism for Vitest integration tests in CircleCI configuration

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[greptile-apps]

_{6 file(s) reviewed, 3 comment(s)
Edit PR Review Bot Settings}

[greptile-apps]

style: Consider adding a brief comment explaining the purpose of this file and the storybookSveltekitPlugin

[greptile-apps]

style: Consider adding type annotations for better clarity and to prevent potential issues

[greptile-apps]

style: Consider adding a type annotation for the return value of getVitestPluginInfo

[kasperpeulen]

LGTM