Components: Generate Menu

[JasonVMo]

Summary

Generate Menu with its canonical contract, implementation, tests, stories, platform validation, and explicit package export so action overlays are available in the agentic library. MenuItem and Divider now exist, while overlay positioning, light dismiss, focus return, roving focus, and type-ahead remain shared blockers.

Observed. menu is entry menu in the canonical catalog and has no
implementation in packages/agentic/components. Upstream describes it as: Composed overlay surface presenting a list of actions or options. Wraps a Popover instance and fills its content slot with MenuItem and Section Header children, inheriting container tokens from Popover and overriding only padding. Provides keyboard navigation, focus management, and ARIA menu context.

Goal

Generate the menu component in
packages/agentic/components/src/components against the
canonical Fluent Flex spec, with the colocated coverage, stories, and platform
validation the package requires, and export it explicitly from
src/index.ts.

Stage

Stage 2 (beta). Wave 2 - overlay and popover stack.

Why it matters

Observed. The canonical catalog has 50 components and the agentic library has
generated 18. menu is one of the 32 in the gap, enumerated in
the missing-components index.

Inferred. It belongs to the overlay stack, which is the largest single cluster of blocked components. Delivering the cluster converts a broad "not implementable" state into ordinary component work.

Observed current state

Canonical spec and source

Field	Value
Canonical spec	plugins/components/skills/menu/SKILL.md with usage.md, web/tokens.yaml, web/accessibility.md, and web/interaction.md, at x3-design/fluent-design @ d334acf
Upstream tier	molecule
Upstream catalog key	menu in component-map.yaml
Local staged spec	packages/agentic/components/specs/menu - SPEC.md, usage.md, interaction.md, accessibility.md, tokens.yaml, blockers.md
Local implementation	None. No src/components/menu directory exists

Closest existing FURN or V1 implementation

• packages/components/Menu - The most complete legacy composition: Menu, MenuTrigger, MenuPopover, MenuList, MenuItem, MenuItemCheckbox, MenuItemRadio, MenuGroup, MenuGroupHeader, MenuDivider, MenuCallout, and a shared context/. MenuList and MenuGroup render FocusZone for keyboard navigation.

Note on platform canon. Where a legacy package has platform-specific files, the
desktop path (.win32, .windows, .macos, or the unsuffixed cross-platform file)
is the compatibility reference. .ios, .android, and .mobile variants are not
treated as the cross-platform canonical implementation.

Local dependencies

• src/components/menu-item - Observed present (component).
• src/components/divider - Observed present (component).

Known blockers

Observed (blockers.md, blocker class B in the index).

Three blockers were recorded: the spec is explicitly a composition of Popover plus MenuItem and Divider children and "this package currently exports only Button and Icon"; the behavior requires a real overlay pipeline with light dismiss, trigger anchoring, submenu positioning, and focus return; and the accessibility contract depends on platform keyboard and focus behavior including roving focus and type-ahead.

Reassessment.

Partly stale. The first premise is out of date: src/components/menu-item and src/components/divider now exist. The overlay and focus blockers remain. Inferred: unblocked by popover plus the focus decision in focus-zone.md.

Scope

• Ingest or promote the spec into the component directory in the generated shape
  (SPEC.md plus a spec/ folder), per
  spec-ingestion-and-generation.md.
• Establish the public contract first: variants, slots, native props, accessibility,
  interaction states, and platform behavior.
• Implement the required file structure from
  src/components/AGENTS.md:
  menu.types.ts, menu.styles.ts, use*.ts, use*Styles.ts, render*.tsx, and
  the assembly module with a displayName.
• Style from Flex tokens first and record genuine token gaps rather than substituting
  unrelated values.
• Export the component, its public types, and the state, style, and render stages
  explicitly from src/index.ts under component-qualified unstable names.
• Compose the overlay host from popover and inherit its container tokens, overriding only padding as upstream specifies.
• Decide the keyboard model against the outcome of focus-zone.md: roving focus, Home/End, type-ahead, and submenu open and close.
• Decide whether submenus are in scope for the first version.

Out of scope

• Changing the contract of an existing generated component, unless this task explicitly
  calls for it above; raise it as its own item.
• Building shared infrastructure owned by another task: overlay hosting
  (popover), roving focus (focus-zone.md), spec
  ingestion (spec-ingestion-and-generation.md),
  or the coverage contract (component-test-strategy.md).
• Migrating any legacy FURN consumer onto this component.
• Mobile platform support; the applicable upstream companion is web, retargeted to
  React Native for Windows and macOS.

Deliverables

• src/components/menu/ implementing the full required file structure.
• SPEC.md and a spec/ companion folder with provenance recording the upstream path,
  SHA, and ingestion date.
• Colocated menu.test.tsx, menu.types.test.ts, and menu.stories.tsx.
• Snapshot coverage where the visual contract is state-dependent, or a recorded
  exemption.
• Explicit exports from src/index.ts, with src/index.test.ts updated.
• A changeset, per the repository's version management rules.
• A recorded readiness level with its supporting evidence.

Required coverage, stories, and platform validation

Runtime and type coverage:

• Trigger opens and closes the menu, and the trigger's accessibility state reflects it.
• Arrow-key navigation, Home/End, and wrap behavior across MenuItem children.
• Section headers are not focusable.
• Escape and outside press dismiss, and focus returns to the trigger.
• Menu and menu-item roles and the accessible name of the menu.
• User style and handler forwarding, and that user styles are applied after component
  styles.
• Compile-time slot acceptance and any mutually exclusive props.

Stories: a typed Meta titled Components/Menu, an args-driven Default, a
grouped Overview when the contract has several axes, one focused story per variant
axis, and an interactive story for each stateful axis. Self-driving axes expose
default<State> as the control; externally driven selection is owned by the story with
React.useState. Identity-changing axes are not exposed as controls.

Platform validation: the component's stories render and behave correctly on macOS
and on React Native Windows Fabric through apps/storybook,
including hover, pressed, disabled, focus, optional-slot, and constrained-content
scenarios. Add a stable root testID if the component joins the automated smoke set.

Acceptance criteria

• src/components/menu exists with the required file structure and a displayName.
• Every variant axis in the component's SPEC.md is implemented, or a deviation is recorded in the spec.
• The component styles from Flex tokens, with any genuine token gap recorded rather than approximated.
• Focus feedback renders through FocusVisual; no outline* props and no React Native Windows native focus visuals are introduced.
• State precedence is explicit: disabled wins over pressed, which wins over hovered.
• Every stateful axis is classified as self-driving or externally driven, and both paths are covered.
• Runtime, type, and story coverage satisfy the package coverage contract.
• The component, its public types, and its pipeline stages are exported explicitly from src/index.ts, and src/index.test.ts covers them.
• The component's stories render on macOS and on React Native Windows Fabric.
• yarn workspace @fluentui-react-native/components format, lint, build, and test pass, and the Storybook bundle succeeds for both desktop platforms.
• A readiness level is recorded with its supporting evidence.
• A changeset is included.

Dependencies and ordering

• Blocked by popover for the overlay host, anchoring, light dismiss, and focus return.
• Gated by component-test-strategy.md: the component must satisfy the coverage contract on arrival rather than being retrofitted.
• Gated by readiness-model.md: the target readiness level must be stated before the work starts.
• Consumes the Infrastructure workstream (storybook-e2e.md) for automated macOS and Windows Fabric validation; until it lands, platform validation is manual.

Risks and open decisions

1. Type-ahead is described upstream but is a significant behavior with no React Native precedent in this repository; scope it explicitly in or out.
2. Submenu positioning multiplies the anchoring complexity that popover must already handle.

Evidence and references

• Upstream spec: plugins/components/skills/menu/SKILL.md and
  components-index/SKILL.md
  at x3-design/fluent-design @ d334acf.
• Local staged spec and blocker record: packages/agentic/components/specs/menu.
• Canonical implementations to follow: src/components/button
  for a styled higher-order component and src/primitives/icon
  for a primitive.
• Authoring rules: src/components/AGENTS.md and the
  agentic component authoring skill.
• Workstream context: Components README and
  the missing-components index.

Sources retrieved 2026-08-20.