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feat(ui): add Mosaic Menu component - #9252

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feat(ui): add Mosaic Menu component#9252
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carp/mosaic-menu

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@alexcarpenter

@alexcarpenter alexcarpenter commented Jul 27, 2026

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Description

Adds a reusable Mosaic Menu to @clerk/ui, styled with StyleX on top of the @clerk/headless menu primitive.

Preview: https://swingset-git-carp-mosaic-menu.clerkstage.dev/components/menu

Menu.Trigger defaults to a square ghost Button (size='sm') holding an ellipsis glyph; pass children for a labelled trigger, or render to supply your own element. Menu.Content composes the portal, positioner, and popup, so items are the only children consumers write.

<Menu.Root>
  <Menu.Trigger />
  <Menu.Content>
    <Menu.Item label='Add workspace' icon={<PlusIcon />} />
    <Menu.Separator />
    <Menu.Item label='Sign out' onClick={signOut} />
  </Menu.Content>
</Menu.Root>

Styling notes

  • Themed with StyleX (not slot recipes). Each styled part carries a stable .cl-<slot> class (menu-trigger, menu-positioner, menu-popup, menu-item, menu-item-icon, menu-item-label, menu-separator); consumers override from a later CSS layer.
  • Enter/exit transition (opacity + scale) runs off the popup's own data-starting-style / data-ending-style, disabled under prefers-reduced-motion: reduce. Item hover is gated behind @media (hover: hover) and the keyboard-active item styles off data-active, so pointer and keyboard highlighting stay in sync.
  • The popup's max-height tracks --cl-available-height from the positioner, so long menus scroll rather than overflow the viewport.
  • plus and log-out glyphs added to the canonical icon registry (alongside the new ellipsis) rather than duplicated inline.

Build

  • tsdown.mosaic.config.mts now marks @clerk/headless external, matching feat(ui): add Mosaic Popover component #9241. Without it, the bundled .d.ts can't follow headless's extensionless re-export chain in dist/primitives/*/index.d.ts and fails with [MISSING_EXPORT]. Only styles.css ships from this build.
  • Only styles.css ships from the isolated mosaic build; the mosaic JS is not publicly importable yet, so the changeset is empty.

Docs

  • Swingset docs added (menu.component.stories.tsx + .mdx, archetype A · compound) and wired into the registry + docModules. Named menu.component.* so it doesn't collide with the existing headless Menu primitive page.

How to test

  • pnpm --filter @clerk/ui test src/mosaic/components/menu (7 tests)
  • pnpm --filter @clerk/ui build:mosaic — verifies the menu atoms land in styles.css
  • pnpm run dev:swingset → Components → Menu

Checklist

  • pnpm test runs as expected.
  • pnpm build runs as expected.
  • (If applicable) JSDoc comments have been added or updated for any package exports
  • (If applicable) Documentation has been updated

Type of change

  • 🌟 New feature

Adds a StyleX-themed Menu built on the @clerk/headless menu primitive, with
swingset docs and plus/log-out glyphs in the icon registry.
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Project Deployment Actions Updated (UTC)
clerk-js-sandbox Ready Ready Preview, Comment Jul 27, 2026 3:57pm
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changeset-bot Bot commented Jul 27, 2026

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🦋 Changeset detected

Latest commit: 61b2d09

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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commit: 61b2d09

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API Changes Report

Generated by Break Check on 2026-07-27T15:58:33.964Z

Summary

Metric Count
Packages analyzed 19
Packages with changes 0
🔴 Breaking changes 0
🟡 Non-breaking changes 0
🟢 Additions 0

No API Changes Detected

All packages have stable APIs with no detected changes.


Report generated by Break Check

Last ran on 61b2d09.

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Review Change Stack

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro Plus

Run ID: 005bb2fc-12f5-4a0c-8260-404f4057b143

📥 Commits

Reviewing files that changed from the base of the PR and between 015c270 and 61b2d09.

📒 Files selected for processing (1)
  • packages/ui/src/mosaic/components/menu/menu.styles.ts
🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

  • clerk/clerk_go (manual)
  • clerk/dashboard (manual)
  • clerk/accounts (manual)
  • clerk/backoffice (manual)
  • clerk/clerk (manual)
  • clerk/clerk-docs (manual)
  • clerk/cloudflare-workers (manual)
🚧 Files skipped from review as they are similar to previous changes (1)
  • packages/ui/src/mosaic/components/menu/menu.styles.ts

📝 Walkthrough

Walkthrough

Adds a Mosaic Menu component backed by Clerk headless primitives, with styled trigger, popup, items, icons, separator, portal support, and public exports. Adds StyleX styling, interaction tests, and new registry icons. Adds Storybook and MDX documentation, connects the story and docs to SwingSet resolution, externalizes @clerk/headless in the Mosaic build, and adds a changeset.

Estimated code review effort: 4 (Complex) | ~45 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Title check ✅ Passed The title clearly summarizes the main change: adding the Mosaic Menu component to ui.
Description check ✅ Passed The description matches the changeset and accurately describes the new Menu component, docs, tests, and build updates.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 3

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.changeset/mosaic-menu.md:
- Around line 1-2: Replace the empty changeset front matter in mosaic-menu.md
with an `@clerk/ui` minor release entry and add a concise summary describing the
new public Menu API.

In `@packages/swingset/src/stories/menu.component.mdx`:
- Around line 20-29: Update the Menu usage example around Menu.Item to import or
define the PlusIcon symbol before it is passed to the icon prop, ensuring the
snippet is self-contained and valid for TypeScript consumers.

In `@packages/ui/src/mosaic/components/menu/menu.tsx`:
- Around line 44-47: The default icon-only trigger in the menu component is
unnamed for assistive technology. Update the trigger around the children
fallback in packages/ui/src/mosaic/components/menu/menu.tsx:44-47 to provide a
default aria-label of “Open menu” only when children are absent, while
preserving consumer-supplied labels. Update the default-trigger test in
packages/ui/src/mosaic/components/menu/menu.test.tsx:28-36 to query it by role
and accessible name, asserting name: “Open menu”.
🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

ℹ️ Review info
⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro Plus

Run ID: ff2ea2bc-f4d7-47ec-88d7-ea1f6b2746e0

📥 Commits

Reviewing files that changed from the base of the PR and between f5d84fe and 015c270.

📒 Files selected for processing (12)
  • .changeset/mosaic-menu.md
  • packages/swingset/src/components/DocsViewer.tsx
  • packages/swingset/src/lib/registry.ts
  • packages/swingset/src/stories/menu.component.mdx
  • packages/swingset/src/stories/menu.component.stories.tsx
  • packages/ui/src/mosaic/components/menu/index.ts
  • packages/ui/src/mosaic/components/menu/menu.styles.ts
  • packages/ui/src/mosaic/components/menu/menu.test.tsx
  • packages/ui/src/mosaic/components/menu/menu.tsx
  • packages/ui/src/mosaic/icons/registry.tsx
  • packages/ui/src/mosaic/styles/index.ts
  • packages/ui/tsdown.mosaic.config.mts
🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

  • clerk/clerk_go (manual)
  • clerk/dashboard (manual)
  • clerk/accounts (manual)
  • clerk/backoffice (manual)
  • clerk/clerk (manual)
  • clerk/clerk-docs (manual)
  • clerk/cloudflare-workers (manual)

Comment thread .changeset/mosaic-menu.md
Comment on lines +1 to +2
---
---

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📐 Maintainability & Code Quality | 🟠 Major | ⚡ Quick win

Add an @clerk/ui release entry.

This empty changeset will omit the new public Menu API from the package release and changelog. Add an @clerk/ui minor entry with a concise feature summary.

Proposed fix
 ---
+'`@clerk/ui`': minor
 ---
+
+Add the Mosaic Menu component and menu glyphs.

As per coding guidelines, use Changesets for version management and changelogs. Based on learnings, empty changesets are only appropriate for documentation-only or non-published changes.

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
---
---
---
'`@clerk/ui`': minor
---
Add the Mosaic Menu component and menu glyphs.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In @.changeset/mosaic-menu.md around lines 1 - 2, Replace the empty changeset
front matter in mosaic-menu.md with an `@clerk/ui` minor release entry and add a
concise summary describing the new public Menu API.

Sources: Coding guidelines, Learnings

Comment on lines +20 to +29
```tsx
import { Menu } from '@clerk/ui/mosaic/components/menu';

<Menu.Root>
<Menu.Trigger />
<Menu.Content>
<Menu.Item
label='Add workspace'
icon={<PlusIcon />}
/>

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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Declare the icon used by the usage example.

Line 28 references PlusIcon, but the snippet neither imports nor defines it, so it cannot be copied into a TypeScript consumer.

Proposed fix
 import { Menu } from '`@clerk/ui/mosaic/components/menu`';
+import { iconRegistry } from '`@clerk/ui/mosaic/icons/registry`';
+
+const PlusIcon = iconRegistry.plus;

As per coding guidelines, update documentation for API changes.

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
```tsx
import { Menu } from '@clerk/ui/mosaic/components/menu';
<Menu.Root>
<Menu.Trigger />
<Menu.Content>
<Menu.Item
label='Add workspace'
icon={<PlusIcon />}
/>
import { Menu } from '`@clerk/ui/mosaic/components/menu`';
import { iconRegistry } from '`@clerk/ui/mosaic/icons/registry`';
const PlusIcon = iconRegistry.plus;
<Menu.Root>
<Menu.Trigger />
<Menu.Content>
<Menu.Item
label='Add workspace'
icon={<PlusIcon />}
/>
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/swingset/src/stories/menu.component.mdx` around lines 20 - 29,
Update the Menu usage example around Menu.Item to import or define the PlusIcon
symbol before it is passed to the icon prop, ensuring the snippet is
self-contained and valid for TypeScript consumers.

Source: Coding guidelines

Comment on lines +44 to +47
{...mergeStyleProps(themeProps('menu-trigger'), className, style)}
{...rest}
>
{children ?? <EllipsisIcon {...stylex.props(styles.triggerIcon)} />}

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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Make the default icon-only trigger accessible. The default trigger renders only an ellipsis glyph, leaving it unnamed for screen readers; the test currently preserves that regression.

  • packages/ui/src/mosaic/components/menu/menu.tsx#L44-L47: set a default aria-label such as Open menu when children is absent, while allowing a consumer-supplied label to override it.
  • packages/ui/src/mosaic/components/menu/menu.test.tsx#L28-L36: query the default trigger by its accessible name and assert name: 'Open menu'.

As per coding guidelines, implement proper ARIA attributes and comprehensive component tests.

📍 Affects 2 files
  • packages/ui/src/mosaic/components/menu/menu.tsx#L44-L47 (this comment)
  • packages/ui/src/mosaic/components/menu/menu.test.tsx#L28-L36
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/ui/src/mosaic/components/menu/menu.tsx` around lines 44 - 47, The
default icon-only trigger in the menu component is unnamed for assistive
technology. Update the trigger around the children fallback in
packages/ui/src/mosaic/components/menu/menu.tsx:44-47 to provide a default
aria-label of “Open menu” only when children are absent, while preserving
consumer-supplied labels. Update the default-trigger test in
packages/ui/src/mosaic/components/menu/menu.test.tsx:28-36 to query it by role
and accessible name, asserting name: “Open menu”.

Source: Coding guidelines

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