Svelte: Support v5 prereleases

[allozaur]

Closes #24886

What I did

Changes for rendering stories for Svelte 5 where "Components are no longer classes"

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 pull request has been released as version 0.0.0-pr-24889-sha-7abeedf4. Install it by pinning all your Storybook dependencies to that version.

More information

Published version	0.0.0-pr-24889-sha-7abeedf4
Triggered by	@JReinhold
Repository	allozaur/storybook
Branch	allozaur/#24886
Commit	7abeedf4
Datetime	Thu Nov 30 09:30:10 UTC 2023 (1701336610)
Workflow run	7044517732

To request a new release of this pull request, mention the @storybookjs/core team.

core team members can create a new canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=24889

[socket-security]

New and updated dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
svelte	5.0.0-next.19	None	+10	3.25 MB	svelte-admin
svelte-check	3.4.6...3.6.2	None	+0/-0	8.84 MB	svelte-language-tools-deploy

[storybook-bot]

Failed to publish canary version of this pull request, triggered by @JReinhold. See the failed workflow run at: https://github.com/storybookjs/storybook/actions/runs/6958036201

[socket-security]

👍 Dependency issues cleared. Learn more about Socket for GitHub ↗︎

This PR previously contained dependency changes with security issues that have been resolved, removed, or ignored.

[JReinhold]

We're running into this issue currently: sveltejs/svelte#9716

It means that when you change a control, any of the controls that are unset will make the component discard the fallback value and turn undefined instead.

[yannbf]

Looking good! But the sandboxes should be generated in a separate branch that is not a fork

[JReinhold]

Sandbox is failing to be created because a transitive upstream package doesn't allow Svelte 5 yet: sveltejs/svelte-hmr#87