Svelte: Fix automatic argTypes inference coming up empty with [email protected]

[JReinhold]

Follow-up to #30783

What I did

sveltejs/language-tools#2667 changed the internal name of the render-function, which we use to infer prop types from Svelte components. It also exposes the name of the render-function as a variable now, that we can use, however it's all still marked as internal, so I'm not sure how much safety it actually gives us.

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

Updates Svelte component prop type inference by upgrading svelte2tsx to version 0.7.35 and modifies the render function identification method in the docgen generator.

• Updated code/frameworks/svelte-vite/package.json to use svelte2tsx ^0.7.35
• Modified code/frameworks/svelte-vite/src/plugins/generateDocgen.ts to use internalHelpers.renderName instead of hardcoded 'render'
• Note: Solution relies on internal svelte2tsx APIs which may be unstable

[greptile-apps]

LGTM

_{2 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings | Greptile}

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 81285e4.

Command	Status	Duration	Result
nx run-many -t build --parallel=3	✅ Succeeded	1m 55s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-03-11 07:48:40 UTC

[dummdidumm]

You should be fine to use the internal helper, if we change the signature of one of the helpers or remove one, that would require a major (aka. 0.next-minor.0) for us as well since other Svelte intellisense packages rely on it and would break then. So it could change but you would not break from it (since you have to first bump to the new major).

[JReinhold]

@kasperpeulen self-merging