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WC: Add tests and stories to cover new types of inputs - #36707
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WalkthroughThe Lit TypeScript sandbox adds a counter component, manifest-based docgen configuration, stories, and browser tests. The changes also add docgen baselines and extend filtering for globally referenced payloads. ChangesLit Web Components sandbox and docgen
Global-reference filtering
Sequence Diagram(s)sequenceDiagram
participant Story as Counter story
participant Counter as DemoWcCounter
participant Callback as Event callback
participant Actions as Actions panel
Story->>Counter: Click increment button
Counter->>Callback: Dispatch count-changed event
Callback->>Actions: Log event
Priority: ⬇️ Low Merge Risk: 🔵 Low · up to
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Inline comments:
Review comments at
@code/renderers/web-components/template/stories_lit-vite-default-ts/demo-wc-counter/DemoWcCounter.js:
- Line 143: Update increment() so it dispatches count-changed only when the
count actually changes; compare the next count with the current count before
dispatching, including when step is zero.
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📒 Files selected for processing (12)
code/e2e-sandbox/framework-web-components.spec.tscode/lib/cli-storybook/src/sandbox-templates.test.tscode/lib/cli-storybook/src/sandbox-templates.tscode/lib/docgen-harness/src/sandbox-baselines/__baselines__/lit-vite-default-ts/stories-renderers-web-components-demo-wc-card.jsoncode/lib/docgen-harness/src/sandbox-baselines/__baselines__/lit-vite-default-ts/stories-renderers-web-components-lit-vite-default-ts-demo-wc-counter.jsoncode/lib/docgen-harness/src/sandbox-baselines/__baselines__/lit-vite-default-ts/stories-renderers-web-components-script.jsoncode/lib/docgen-harness/src/sandbox-baselines/read-static-docgen.test.tscode/lib/docgen-harness/src/sandbox-baselines/read-static-docgen.tscode/renderers/web-components/template/stories_lit-vite-default-ts/custom-elements.jsoncode/renderers/web-components/template/stories_lit-vite-default-ts/demo-wc-counter.stories.jscode/renderers/web-components/template/stories_lit-vite-default-ts/demo-wc-counter/DemoWcCounter.jscode/renderers/web-components/template/stories_lit-vite-default-ts/demo-wc-counter/index.js
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Package BenchmarksCommit: The following packages have significant changes to their size or dependencies:
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| Before | After | Difference | |
|---|---|---|---|
| Dependency count | 73 | 73 | 0 |
| Self size | 21.60 MB | 21.64 MB | 🚨 +42 KB 🚨 |
| Dependency size | 31.24 MB | 31.24 MB | 🚨 +502 B 🚨 |
| Bundle Size Analyzer | Link | Link |
@storybook/vue3-vite
| Before | After | Difference | |
|---|---|---|---|
| Dependency count | 95 | 95 | 0 |
| Self size | 32 KB | 32 KB | 🎉 -24 B 🎉 |
| Dependency size | 18.77 MB | 18.78 MB | 🚨 +11 KB 🚨 |
| Bundle Size Analyzer | Link | Link |
@storybook/web-components-vite
| Before | After | Difference | |
|---|---|---|---|
| Dependency count | 6 | 6 | 0 |
| Self size | 19 KB | 19 KB | 0 B |
| Dependency size | 515 KB | 527 KB | 🚨 +12 KB 🚨 |
| Bundle Size Analyzer | Link | Link |
@storybook/cli
| Before | After | Difference | |
|---|---|---|---|
| Dependency count | 179 | 179 | 0 |
| Self size | 872 KB | 873 KB | 🚨 +1 KB 🚨 |
| Dependency size | 87.04 MB | 87.09 MB | 🚨 +43 KB 🚨 |
| Bundle Size Analyzer | Link | Link |
@storybook/codemod
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| Dependency count | 172 | 172 | 0 |
| Self size | 44 KB | 44 KB | 🚨 +36 B 🚨 |
| Dependency size | 85.53 MB | 85.57 MB | 🚨 +43 KB 🚨 |
| Bundle Size Analyzer | Link | Link |
create-storybook
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| Dependency count | 74 | 74 | 0 |
| Self size | 1.07 MB | 1.07 MB | 🎉 -10 B 🎉 |
| Dependency size | 52.84 MB | 52.88 MB | 🚨 +43 KB 🚨 |
| Bundle Size Analyzer | node | node |
@storybook/vue3
| Before | After | Difference | |
|---|---|---|---|
| Dependency count | 91 | 91 | 0 |
| Self size | 229 KB | 229 KB | 0 B |
| Dependency size | 18.21 MB | 18.22 MB | 🚨 +11 KB 🚨 |
| Bundle Size Analyzer | Link | Link |
@storybook/web-components
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| Dependency count | 4 | 4 | 0 |
| Self size | 182 KB | 194 KB | 🚨 +12 KB 🚨 |
| Dependency size | 126 KB | 126 KB | 0 B |
| Bundle Size Analyzer | Link | Link |
valentinpalkovic
approved these changes
Oct 13, 2026
This was referenced Oct 13, 2026
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Closes #
What I did
This PR adds tests and stories to cover the new different types of supported inputs
count,--demo-wc-counter-badge-opacity<number>CSS propertydisabledlabel, slots, parts, statessizetonebadgesArray<'new' | 'hot' | 'sale'>unitdeadlineDate--demo-wc-counter-accent<color>CSS propertycount-changed,increment,atMax-eventwithfn(),-slot,-part,-stateand--CSS custom properties.{ arg, control, input, expected }, for examplecountfilled with7shows7 stars.argTypescannot be read inplayunder server docgen, so Controls input kinds are checked in the e2e spec rather than in stories.How to review
code/lib/cli-storybook/src/sandbox-templates.tsOnly
default-tssetscomponentsManifest, which adds it to the docgen baseline gate.enablesDocgenServeraccepts@storybook/web-components.template/stories_lit-vite-default-ts/demo-wc-counter/DemoWcCounter.jstemplate/stories_lit-vite-default-ts/custom-elements.jsonThe manifest is generated by the analyzer, so skim it.
template/stories_lit-vite-default-ts/demo-wc-counter.stories.jsplayassertions out, one binding rule per story.code/e2e-sandbox/framework-web-components.spec.tsCONTROL_KINDS,NO_CONTROL_ROWS,CONTROL_EDITS,DOCS_ROWS.The helpers at the bottom only turn a row into Playwright calls.
code/lib/docgen-harness/src/sandbox-baselines/read-static-docgen.tsread-static-docgen.test.tscode/lib/docgen-harness/src/sandbox-baselines/__baselines__/lit-vite-default-ts/*.jsonThe counter baseline should match the Summary table.
code/lib/cli-storybook/src/sandbox-templates.test.tsThe
template/paths are undercode/renderers/web-components/.## Checklist for ContributorsTesting
The changes in this PR are covered in the following automated tests:
Manual testing
Caution
This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!
Documentation
MIGRATION.MD
Checklist for Maintainers
When this PR is ready for testing, make sure to add
ci:normal,ci:mergedorci:dailyGH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found incode/lib/cli-storybook/src/sandbox-templates.tsDeclare whether manual QA will be needed for this PR during the next release, through
qa:neededorqa:skipMake 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 - 🚫 Not run
This PR does not have a canary release associated.
In-repo PRs: add the
ci:canarylabel. Later pushes republish while the label remains.Fork PRs: the label does nothing (a later push must not auto-publish). A maintainer publishes from this repository with Run workflow and the
prinput.branchandshaare optional; if more than one is set, they must be the same commit. The fork author does not need to do anything.