Vue: Provide apiDescription in the manifest

[huang-julien]

Closes #

What I did

This PR construct and fill the apiDescription field in the manifest for Vue.

It provides the API for a component that a user or agent can use:

• Models
• Props
• Slots
• Exposed

Models

A prop paired with its update: event renders once as a v-model binding — listed first, with the exact syntax to type — instead of a prop plus an event to wire by hand:

## Models

Two-way bindings. Bind each one with the `v-model` syntax shown next to it — do not pass the prop and listen to its `update:` event separately.

```
export type VModelInputModels = {
  /** The text value controlled via the default v-model. */
  modelValue: string; // v-model="..."
  /** Whether the box is checked, controlled via the named v-model. */
  checked?: boolean; // v-model:checked="..."
}
```

Props

Descriptions and defaults come along, withDefaults included:

## Props

```
export type DefineSlotsWithPropsProps = {
  /**
   * Visible label of the button.
   *
   * @default "Button"
   */
  label?: string;
  /**
   * Whether the button is disabled.
   *
   * @default false
   */
  disabled?: boolean;
}
```

Events

Payloads render as the tuple types from defineEmits:

## Events

```
export type EventsJsdocEvents = {
  /** Emitted when the user cancels editing. */
  cancel: [];
  /** Emitted when the user saves the current value. */
  save: [payload: { id: number; }];
}
```

Slots

Each slot is typed with the props it passes to its content:

## Slots

```
export type DefineSlotsWithPropsSlots = {
  /** Main content, rendered instead of the label. */
  default: any;
  /** Icon rendered before the content. */
  icon: { size: string; };
}
```

Exposed

The defineExpose surface, for driving a component through a template ref:

## Exposed

Available on the component instance through a template ref.

```
export type DefineExposeExposed = {
  /** How many times the button has been pressed. */
  count: number;
  reset: () => void;
}
```

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

• Generate a Vue sandbox: yarn task sandbox --template vue3-vite/default-ts --start-from auto
• Enable features: { experimentalDocgenServer: true, componentsManifest: true },
• Build it
• serve it : npx serve storybook-static -p 8080
• In a second Storybook that has @storybook/addon-mcp (any sandbox works), compose the built one and start it:
• refs: { builtVue: { title: 'Built Vue', url: 'http://localhost:8080' } },
• Either use the CLi or skill or the MCP to get the documentation of a component.

Alternatively, you can check the menifest to verify whether apiDescription for each components are correctly filled.

Caution

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

• Declare whether manual QA will be needed for this PR during the next release, through qa:needed or qa:skip

• 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 publish.yml --field pr=<PR_NUMBER>

[storybook-app-bot]

Package Benchmarks

^{Commit: 4e0ac01, ran on 18 August 2026 at 08:00:48 UTC}

No significant changes detected, all good. 👏

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• code/renderers/vue3/src/docgen/api-description.test.ts

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• code/renderers/vue3/src/docgen/api-description.test.ts

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---

Walkthrough

Vue 3 docgen now converts component metadata into Markdown sections for models, props, events, slots, and exposed members. The payload identifies the Vue 3 renderer. Unit and integration tests cover formatting, filtering, models, JSDoc, and real metadata output.

Changes

Vue 3 API Description

Layer / File(s)	Summary
API description rendering code/renderers/vue3/src/docgen/api-description.ts, code/renderers/vue3/src/docgen/api-description.test.ts	buildApiDescription generates Models, Props, Events, Slots, and Exposed sections. It groups matching v-model events, filters global props, formats declarations and documentation comments, and returns undefined for empty surfaces. Tests cover the generated Markdown and edge cases.
Docgen payload integration code/renderers/vue3/src/docgen/build-docgen.ts, code/renderers/vue3/src/docgen/component-meta.ts, code/renderers/vue3/src/docgen/vue-project-manager.test.ts	Vue 3 payloads now include the generated API description and the vue3 renderer identifier. Serializable metadata excludes function-valued properties and handles readonly arrays.
Vue 3 integration validation code/lib/docgen-harness/src/vue3/vue3-api-description.test.ts	The integration harness uses real vue-component-meta output and snapshots descriptions for props, models, exposed members, slots, events, and JSDoc annotations.

Sequence Diagram(s)

sequenceDiagram
  participant componentMeta
  participant buildApiDescription
  participant buildDocgen
  participant vueProjectManager
  componentMeta->>buildApiDescription: normalized component metadata
  buildApiDescription-->>buildDocgen: generated Markdown API description
  buildDocgen-->>vueProjectManager: Vue 3 docgen payload
  vueProjectManager-->>vueProjectManager: assert renderer and Props section

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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Actionable comments posted: 2

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Inline comments:
In `@code/lib/docgen-harness/src/vue3/vue3-api-description.test.ts`:
- Around line 1-23: Update the filesystem setup around apiDescriptionFor and the
test suite to use memfs instead of real node:fs fixture reads: mock node:fs at
file scope, reset vol in beforeEach, and seed the required .vue fixture files in
the virtual filesystem. Configure the mocked readdirSync through vi.mocked()
before each test while preserving the existing fixture metadata and
API-description assertions.

In `@code/renderers/vue3/src/docgen/api-description.ts`:
- Line 31: Update typePrefix near the display-name sanitization to prepend a
valid alphabetic or underscore prefix when the sanitized name is empty or does
not begin with [A-Za-z_$], preserving valid names unchanged. In
api-description.ts lines 103-105, serialize non-identifier event property names
with JSON.stringify(name) so apostrophes and other characters produce valid
TypeScript; both sites require direct changes.

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📒 Files selected for processing (6)

• code/lib/docgen-harness/src/vue3/vue3-api-description.test.ts
• code/renderers/vue3/src/docgen/api-description.test.ts
• code/renderers/vue3/src/docgen/api-description.ts
• code/renderers/vue3/src/docgen/build-docgen.ts
• code/renderers/vue3/src/docgen/component-meta.ts
• code/renderers/vue3/src/docgen/vue-project-manager.test.ts

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