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Svelte: Fix source with decorators always showing the SlotDecorator component #24800

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JReinhold
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@JReinhold JReinhold commented Nov 10, 2023

Closes #21477

What I did

Defaulted the Svelte source decorator to always exclude decorators from the source generation.

We have a similar pattern in React, HTML and Web components, however for them excludeDecorators is configurable. I didn't think that was necessary here, since including decorators leads to a broken result, so I don't know why you would want that.

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

  1. Create a Svelte-based sandbox or open a published Storybook from this PR
  2. Navigate to /?path=/docs/stories-renderers-svelte-slot-decorators--docs
  3. Open the source view
  4. See that it says <ButtonJavaScript primary/> and not <SlotDecorator primary/>

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>

@JReinhold JReinhold added svelte ci:daily Run the CI jobs that normally run in the daily job. bug labels Nov 10, 2023
@JReinhold JReinhold marked this pull request as ready for review November 10, 2023 13:38
Comment on lines +42 to +52
test('Decorators are excluded from generated source code', async ({ page }) => {
const sbPage = new SbPage(page);

await sbPage.navigateToStory('stories/renderers/svelte/slot-decorators', 'docs');
const root = sbPage.previewRoot();
const showCodeButton = (await root.locator('button', { hasText: 'Show Code' }).all())[0];
await showCodeButton.click();
const sourceCode = root.locator('pre.prismjs');
const expectedSource = '<ButtonJavaScript primary/>';
await expect(sourceCode.textContent()).resolves.toContain(expectedSource);
});
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I'm hoping to write framework-agnostic versions of this test soon, because I sense that this is an area where we're often seeing regressions.

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@tmeasday tmeasday left a comment

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LGTM.

The only reason not to do it by default is that it is a bit weird that we end up executing the story twice; and folks that aren't using decorators or don't care about source might not want us to do that for .. reasons.

@shilman shilman merged commit a98c17f into next Nov 13, 2023
107 of 112 checks passed
@shilman shilman deleted the 21477-bug-svelte-stories-that-use-a-decorator-show-slotdecorator-as-source branch November 13, 2023 14:12
@github-actions github-actions bot mentioned this pull request Nov 13, 2023
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[Bug]: Svelte stories that use a decorator show <SlotDecorator> as source
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