Recreate a first version of a ui-react component from its `packages/ui-legacy` counterpart when a "ready for dev" Figma mockup does not yet exist. Drives the same recipe as /figma-component — implement in packages/ui-react (component, tests, stories), write its framework-agnostic spec in packages/ui-spec, and add a docs page in apps/docs — but reads the legacy source instead of a Figma node, and maps legacy `--av-*` / Radix patterns onto ui-react `--ui-*` tokens + Base UI. Prefers a component's own `--ui-<name>-*` token tier when one already exists, otherwise falls back to semantic/primitive tokens. The Figma Code Connect link is deferred (no node yet). Invoke with /legacy-component <ComponentName> [legacy-name] [--update].
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Recreate a first version of a ui-react component from its `packages/ui-legacy` counterpart when a "ready for dev" Figma mockup does not yet exist. Drives the same recipe as /figma-component — implement in packages/ui-react (component, tests, stories), write its framework-agnostic spec in packages/ui-spec, and add a docs page in apps/docs — but reads the legacy source instead of a Figma node, and maps legacy `--av-*` / Radix patterns onto ui-react `--ui-*` tokens + Base UI. Prefers a component's own `--ui-<name>-*` token tier when one already exists, otherwise falls back to semantic/primitive tokens. The Figma Code Connect link is deferred (no node yet). Invoke with /legacy-component <ComponentName> [legacy-name] [--update].
A repeatable recipe for landing a first version of a component into
packages/ui-react by porting its mature packages/ui-legacy counterpart, for
when finished Figma mockups don't exist yet. It produces the same shape of
output the Button and Breadcrumb components have — component, tests, stories,
VR baselines, a ui-spec, and an apps/docs page — with two deliberate
differences from /figma-component:
Source is legacy code, not a Figma node. Variants, parts, props, and a11y
come from reading packages/ui-legacy/src/components/ui/<legacy-name>/.
The Figma link is deferred. With no "ready for dev" node, the
.figma.tsx Code Connect is a NEEDS_FIGMA_URL skeleton (not COMPLETE)
and the spec index.yaml ships status: draft with nofigma: block.
Reconcile against the real design later with /figma-component <Name> <url> --update once mockups land.
Everything else — Base UI composition, --ui-* token discipline, the 7-file
spec, tests, the light+dark VR baseline matrix, the changeset — is identical
to /figma-component. Where this file is silent, that recipe and the workspace
contracts govern.
Read the workspace contracts first — they override anything here on conflict:
Reference implementations to copy patterns from:packages/ui-react/src/components/ui/button/ and
packages/ui-spec/components/button/. For a composable, multi-part component,
…/breadcrumb/ is the worked example. The legacy source you port from lives
under packages/ui-legacy/src/components/ui/<legacy-name>/.
PascalCase React name for the new ui-react component (Switch, Tabs). kebab files.
legacy-name
kebab name of the source under ui-legacy/src/components/ui/ if it differs from the new component's kebab name (e.g. dropdown-menu). Defaults to kebab(ComponentName).
--update
Component already exists in ui-react — refresh it against the legacy source.
If the new ui-react name and the legacy kebab name match (most cases), omit
legacy-name.
Phase 0 — Readiness gate (prerequisite)
Same gate as /figma-component. Run the read-only
/component-readiness audit before writing
anything; it catches the silent failures this recipe is most exposed to — dead
var(--ui-*) refs and un-imported token tiers (Phase 2).
bash .claude/skills/component-readiness/scripts/audit.sh <ComponentName> # or `all`
New component: run it on all (or skip — there's nothing for the new
component to audit yet) to confirm you're not building alongside pre-existing
drift. A draft component legitimately reports INCOMPLETE (no Figma node, no
COMPLETE Code Connect) — that's expected here, not a blocker.
--update: run the gate on that component first. A DRIFT verdict means
the update must include the token rewire, not just the legacy re-port.
Phase 1 — Read the legacy source (instead of a Figma node)
Locate the source. The legacy layout is mixed — despite what
ui-legacy/AGENTS.md describes, many components are flat files with their
stories/tests in shared__stories__/ / __tests__/ directories, not in a
per-component folder. Find all the pieces both ways:
# the component (flat file OR folder)ls packages/ui-legacy/src/components/ui/<legacy-name>.tsx \
packages/ui-legacy/src/components/ui/<legacy-name>/ 2>/dev/null
# its story / test (shared dir OR co-located) + an optional docs companion
find packages/ui-legacy/src/components/ui -iname "<legacy-name>.stories.tsx" \
-o -iname "<legacy-name>.test.tsx" -o -iname "<legacy-name>.docs.ts"
(A component may have no test in legacy — card has only a story. That's
fine; you still author a fresh ui-react test in Phase 3.)
Read, in this order:
<legacy-name>.tsx — the implementation. Extract:
Variants & sizes — the cva keys (variant, size, …). These become
the ui-react cva keys and the spec's api.yaml enums verbatim where they
still make sense; rename only with a stated reason.
Parts — for a composable component, every exported sub-component
(Card, CardHeader, CardTitle, …). Each becomes a ui-react part and a
anatomy.parts[] entry.
Props — the prop interface (HTML attrs extended, booleans, callbacks,
content/children). Drives api.yaml and the story argTypes.
States — which classes are pseudo-states (hover:, active:,
focus-visible:, disabled:, data-[open]:) vs. real props.
Composition — does it use Radix Slot/asChild? Which @radix-ui/*
or @base-ui/react primitive does it wrap? (Mapped in Phase 2.)
__stories__/<legacy-name>.stories.tsx — the canonical demos and which
variants/states matter enough to picture. Mirror these as the hand-written
ui-react stories.
__tests__/<legacy-name>.test.tsx — the behaviors worth asserting (roles,
variant classes, ref, events). Port the intent, not the literal --av-*
class assertions.
<legacy-name>.docs.ts if present — a curated prop/type summary.
Write down the variant/size/part/prop/state inventory before coding — it is the
same artifact /figma-component Phase 1 captures from the design, just sourced
from code.
Adapt, don't transliterate. Legacy components are shadcn/Radix-era. Port
the contract and behavior; rebuild the implementation to ui-react
conventions (Base UI, --ui-*, useRender). Drop legacy-only baggage
(asChild, --av-*, opacity-modifier color hacks like bg-primary/90).
This is the phase that differs most from /figma-component. Two translations:
styling (legacy --av-* / bridged names → ui-react --ui-*) and
composition (Radix → Base UI).
2a. Tokens
ui-react colors must resolve to a generated --ui-* token from
@acronis-platform/tokens-pd. Never reference --av-* (that's the legacy
prefix) and never hand-author hex/hsl. Pick the token tier in this order:
Component-specific tier, if it already exists. Check first:
ls packages/tokens-pd/css/<ComponentName>/ 2>/dev/null && \
grep -rn "<component>""packages/tokens-pd/css/<ComponentName>/default.css" | head
If a --ui-<name>-* tier exists (e.g. a token sync already shipped it),
prefer it — reference the tokens directly with arbitrary values
(bg-[var(--ui-<name>-...-idle)], hover:…) exactly like Button, and add
its @import line to src/styles/index.css (see the opt-in note below).
Semantic / primitive tokens (the common case here). With no Figma
mockup, most ported components have no component tier yet. Map the
legacy styling onto the shared semantic vocabulary instead. This is
cheap because legacy and ui-react use the same bridged Tailwind names —
so much of the legacy className carries over unchanged. Both bridges
resolve to --ui-* (legacy → --av-*; ui-react → --ui-*), so keep the
short name and let ui-react's @theme inline block do the rest:
Bridged Tailwind name (legacy and ui-react)
ui-react --ui-* it resolves to (src/styles/index.css)
Verify every bridged name actually exists in ui-react before reusing it.
Legacy bridges some names that ui-react's @theme inline block does not
— e.g. legacy bg-card / text-card-foreground have no ui-react
equivalent, so reusing them yields background-color: var(--color-card)
with --color-card undefined → a silent invalid property (the same
failure mode as a dead --ui-*). The bare Tailwind border utility is
similar — it picks up a default border color in legacy but renders
transparent/currentColor in ui-react, so always write border-border
explicitly. Grep the bridge before trusting a name:
grep -oE '\-\-color-[a-z-]+' packages/ui-react/src/styles/index.css | sort -u.
A name not in that list must be remapped to one that is (a card surface →
bg-background; card text → text-foreground) or bridged anew. (Worked
example: card ported bg-card→bg-background,
text-card-foreground→text-foreground, bare border→border border-border.)
For any legacy color that uses a raw --av-* arbitrary value or an
opacity hack (bg-primary/90, bg-accent/10) with no bridged equivalent,
pick the nearest semantic --ui-* token by role — browse the available
names and choose by intent (a hover surface → --ui-background-surface-hover,
a danger fill → --ui-background-status-danger), don't invent a value:
If a shared color you need isn't bridged yet, add it to the @theme inline
block in src/styles/index.css (don't reference a one-off --ui-* inline
if it's genuinely shared).
Don't invent a component tier. If a port really needs per-component
tokens that don't exist, those belong upstream in
@acronis-platform/design-tokens → rebuild tokens-pd. For a design-pending
v1, prefer staying on semantic tokens and flag to the user that the
component-specific palette is pending a Figma/token pass — don't hand-author
it here.
Wire each interaction state to its own token (hover: → *-hover,
disabled: → *-disabled) — never an opacity modifier on the idle color
(legacy's bg-primary/90 is exactly the pattern to drop). Brand overrides only
honor the referenced token.
tokens-pd component tiers are opt-in. If you do use an existing
--ui-<name>-* tier, add one @import '@acronis-platform/tokens-pd/css/<Name>/default.css';
to src/styles/index.css or the component renders unstyled. A component built
on semantic tokens only needs no new import (the semantic tier is always loaded).
On --update, re-verify every token ref against the current tokens-pd.
A missing CSS var is a silent failure — var(--does-not-exist) makes the
property invalid and the element falls back to inherited color; nothing fails
the build, typecheck, or lint:
for t in $(grep -oE 'ui-[a-z-]+' packages/ui-react/src/components/ui/<name>/<name>.tsx | sort -u); do grep -qrF -- "--$t" packages/tokens-pd/css/ && echo "OK $t" || echo "MISS $t"; done
The spec (tokens.yaml) and the tests pin token names too — drift them together.
2b. Composition (primitive mapping)
Translate the legacy primitive to the ui-react convention:
Radix Slot / asChild (legacy polymorphism) → Base UI useRender +
mergeProps with a render prop. Never add @radix-ui/react-slot or
asChild to ui-react.
A @radix-ui/react-* stateful primitive (dialog, menu, switch, tooltip,
popover, …) → wrap the @base-ui/react equivalent. Check it exists:
ls node_modules/@base-ui/react/. Read the primitive's .d.ts for the real
forwarded props (they differ from Radix — don't assume).
No Base UI primitive (e.g. breadcrumb, card) → build semantic HTML +
useRender for the polymorphic parts, exactly like the breadcrumb reference.
2c. Icons
Same as /figma-component. Use @acronis-platform/icons-react/<pack> (usually
stroke-mono); confirm the icon exists before importing
(ls packages/icons-react/src/packs/stroke-mono/icons | grep -i <name>). Names
are PascalCase(asset) + Icon; pass size={16} for 16px icons.
Phase 3 — Implement in packages/ui-react
Identical to /figma-component Phase 3. Create
packages/ui-react/src/components/ui/<name>/:
<name>.tsx
<name>.figma.tsx # Code Connect — NEEDS_FIGMA_URL skeleton (see below)
index.ts
__tests__/<name>.test.tsx
__stories__/<name>.stories.tsx
__stories__/<name>.generated.stories.tsx # produced in Phase 4
Conventions (mirror Button): React.forwardRef + displayName; prop interface
extends the right HTML attrs (or the Base UI primitive's props) + VariantProps
when using cva; cva for variant/size merged with cn(); polymorphism via
useRender({ render, ref, defaultTagName, props: mergeProps<'tag'>({…}, props) }).
Export everything from index.ts, then add an alphabetical line to
src/index.ts. For a composable component, export the full set of parts.
Figma Code Connect — deferred. Because there's no "ready for dev" node yet,
the .figma.tsx carries the NEEDS_FIGMA_URL status marker (props are
mapped correctly from the legacy contract; the node URL is a placeholder). Write
the figma.connect(Component, 'FIGMA_NODE_URL', { props, example }) with the
real prop mappings you derived in Phase 1, leave the URL as the placeholder, and
set the header status comment to NEEDS_FIGMA_URL (see
context/figma-code-connect.md).
Do not run figma:connect against a placeholder URL expecting it to pass —
it validates structure, not the (absent) connection. The real URL + COMPLETE
status land later via /figma-component <Name> <url> --update.
Phase 4 — Spec in packages/ui-spec (7-file format)
Identical to /figma-component Phase 4, with two draft-status adjustments.
Create packages/ui-spec/components/<name>/. If a legacy spec exists at
@uikit/ui-kit/packages/specs/components/<name>, use it as a content source but
adapt to the React reality (legacy specs describe the Vue API).
File
Notes
index.yaml
component PascalCase, name kebab, status: draft, category, since. Omit the figma: block (no node yet — it's optional in the schema).
anatomy.yaml
root (element/role), parts (each id used in the schematic!), layout, states.
Names only, ^--ui-…$. The semantic --ui-* tokens you mapped in Phase 2 (and any existing component tier). No values/defaults.
behavior.md
Given/When/Then scenarios (port from the legacy tests/stories).
accessibility.md
ARIA, keyboard, screen reader, contrast.
README.md
When to use / not use, examples, parts table. Note it's a design-pending v1.
Hard rules enforced by __tests__/specs.test.ts (unchanged):
Every parts[].id must appear as a substring in anatomy.schematic.
A states[] entry with kind: prop must reference a real api.yaml property;
kind: pseudo needs a pseudo selector; kind: internal needs an
internal_state[] entry. Structural distinctions are parts, not states.
For cva components, api.yamlvariant/size enums must equal the actual
cva keys in the ui-react source (conformance test).
Generate the states story (don't hand-write .generated):
pnpm --filter @acronis-platform/ui-spec generate:stories. A composable /
multi-part component renders empty (just <Name />) unless you give it a
RENDER hint in packages/ui-spec/scripts/generate-stories.ts — an
extraImports line importing the sub-parts and a sample string composing them.
This is a deliberate edit to the spec tooling, outside the component dir; do
it before generating. (Worked examples: the breadcrumb and card entries — a
component with no variant/size/checked/disabled lands in the generator's
final States branch and just wraps your sample in <Name>…</Name>.)
generate:stories rewrites every component's .generated.stories.tsx in
raw, unformatted JSX — and the committed copies were Prettier-formatted by
lint-staged on their original commit. So a run leaves the whole set looking
"modified" with whitespace-only diffs. Two cleanups: (1)prettier --write
your new component's generated file (or just let the pre-commit hook format it),
and (2)git checkout -- the unrelated siblings the run touched — don't
sweep their formatting churn into your change. Confirm with
git status packages/ui-react/src/components/ui/*/__stories__/*.generated.stories.tsx.
Hand-write <name>.stories.tsx
for the rich demo stories, mirroring button.stories.tsx and the legacy stories
you read in Phase 1.
Wide argTypes (required). The hand-written meta.argTypes must expose a
control for every meaningful prop — enumerate the real props from the
component source (cva keys, booleans, content props, callbacks, render).
Control by kind (select w/ exact options for unions, boolean, text,
number; control: false for callbacks/render/element-only). Every entry
carries a description + table: { type, category }. Preview toolbars (brand,
light/dark, direction, locale) come for free; add a Localized story only when a
locale-/RTL-sensitive demo is worth a baseline (add keys to .storybook/i18n.ts
for all six locales). VR safety: don't change what an existing story renders.
Phase 5 — Document in apps/docs (components section)
Add a documentation page so the new component shows up in the docs site's
Components section in the same style as every other ui-react page. Three
pieces: a live demo, an MDX page, and a nav entry.
The docs AGENTS.md is stale on this point. It says "ui-react has no live
demos" — that's no longer true. Essentially every ui-react component page now
renders a live demo via <DemoReact>, which mounts the component inside a
shadow root (src/components/ShadowDemo.tsx) that adopts ui-react's
stylesheet from /api/ui-react-css — sidestepping the RSC alias problem the
note describes. Follow the live-demo pattern below; don't fall back to static-
only pages.
1. Live demo — apps/docs/src/components/demos-react/<name>.tsx:
'use client' at the top (the demo uses ui-react's client components).
Import the component(s) from @acronis-platform/ui-react (and icons from
@acronis-platform/icons-react/<pack>), and export function <Name>Demo()
rendering a representative composition — mirror the hand-written story.
Network-free, same rule as the VR stories ([[vr-stories-no-network]]): no
remote images; data-URI/local only.
If the component has portaled overlays (menu/select/tooltip popups), read
useShadowMount() and pass it as the primitive's portalContainer so the
popup inherits the shadow root's styles (see demos-react/input-select.tsx).
2. MDX page — apps/docs/content/docs/components/<name>.mdx. Mirror an
existing page (breadcrumb.mdx for a compound component, card-filter.mdx for a
single one):
---
title: <Name> # PascalCase
description: <one line> # reuse the spec index.yaml description
---
import { DemoReact } from "@/components/DemoReact";
import { <Name>Demo } from "@/components/demos-react/<name>";
## Usage
\`\`\`tsx
import { <Name> } from '@acronis-platform/ui-react';
\`\`\`
<prose: what it is, the parts, polymorphism via the `render` prop, which tokens
theme it — note it's a design-pending v1 if useful>
## Examples
<DemoReact>
<<Name>Demo />
</DemoReact>
<one fenced ```tsx``` block per meaningful example, mirroring the hand stories>
## API Reference
<AutoTypeTable
path="../../packages/ui-react/src/components/ui/<name>/<name>.tsx"
name="<Name>Props"
/>
<AutoTypeTable> is a global MDX component — do not import it. Its
path is relative to apps/docs/ (../../packages/ui-react/...), unlike
DemoPreview paths. name is an exported prop interface.
Compound component: emit one <AutoTypeTable> per distinct exported props
interface, then a sentence covering the parts that just take native element
attributes (see breadcrumb.mdx). When several parts share one interface
(e.g. Card's CardPartProps), one table + a sentence ("all parts accept …")
is enough.
If AutoTypeTable can't resolve a type (re-exported Base UI props, complex
generics, a part with no own interface), add a .docs.ts companion next to the
component source and point path at that instead.
3. Nav entry — add "<name>" to the pages array in
apps/docs/content/docs/components/meta.json, under the right ---Section---
divider (Buttons & Actions, Inputs & Forms, Data Display,
Navigation & Layout, Overlays). Pick by category; add a new divider only if
none fits.
Verify the docs build (no test suite here — it's build-verified):
A broken AutoTypeTablepath/name or a missing demo import fails the build,
not typecheck — so run the build.
Live demos need ui-react's compiled CSS — already handled, but know why.<DemoReact> mounts the demo in a shadow root that adopts ui-react's compiled
dist/ui-react.css (served by /api/ui-react-css), a gitignored artifact.
apps/docs has predev/prebuild hooks that run pnpm --filter @acronis-platform/ui-react build
first, so uikit-docs dev/build regenerate it automatically (≈1.5s) — replicate
that if you ever run Next directly, or the previews render unstyled. Corollary
for the demo file: the shadow root adopts only that compiled sheet, which is
Tailwind-built from ui-react's own source — so a demo may only use utility classes
ui-react itself ships. A class used solely in the demo (never by a shipped
component or its story) is tree-shaken out and silently no-ops in the preview;
prefer inline style={{…}} for one-off demo layout.
Phase 6 — Verify & changeset
Identical to /figma-component Phase 5.
pnpm --filter @acronis-platform/ui-react test
pnpm --filter @acronis-platform/ui-react typecheck
pnpm --filter @acronis-platform/ui-react lint
pnpm --filter @acronis-platform/ui-react build # confirms exports bundle, .figma.tsx excluded
pnpm --filter @acronis-platform/ui-spec test
pnpm -r typecheck # what the pre-commit hook runs
Add a changeset for the published package only (ui-react): minor for a
new component, patch for an update. ui-spec is private (0.0.0); no
changeset:
.changeset/<name>-component.md
---
'@acronis-platform/ui-react': minor # or: patch (update)
---
Add `<Name>` (initial version ported from ui-legacy; design reconciliation pending).
Visual regression. Stories are VR cases; CI runs a light and dark
matrix, so every story has two baselines (<id>.png and <id>--dark.png).
Regenerate both in Docker and review the PNGs before committing:
pnpm --filter @acronis-platform/ui-react storybook:test:visual:docker:update:all # regenerate light + dark
pnpm --filter @acronis-platform/ui-react storybook:test:visual:docker:all # check both (what CI runs)
When you remove or rename a story, delete BOTH its baselines. Never commit
baselines rendered on macOS/Windows — they won't match CI's Linux renderer. (See
the /figma-component Phase 5 notes for the single-mode variants and the
"zero PNGs rewritten on --update" case.)
Output checklist (done = all green)
src/components/ui/<name>/<name>.tsx — Base UI + --ui-* tokens
(component tier if it exists, else semantic/primitive), no --av-*, no hex.
index.ts + alphabetical export line in src/index.ts.
If an existing --ui-<name>-* tier is used: @import added to src/styles/index.css.
__tests__/<name>.test.tsx — render, variants/states, a11y roles, ref,
render-prop composition (intent ported from the legacy tests).
VR baselines regenerated in Docker for both light and dark and reviewed;
both <id>.png and <id>--dark.png committed (orphans deleted).
<name>.figma.tsx — NEEDS_FIGMA_URL skeleton with real prop mappings, placeholder URL.
packages/ui-spec/components/<name>/ — 7 files, status: draft, no
figma: block, ui-spec test green.
apps/docs: src/components/demos-react/<name>.tsx (live demo) +
content/docs/components/<name>.mdx (Usage / Examples / API Reference) +
meta.json nav entry; uikit-docs build passes.
Changeset for @acronis-platform/ui-react.
test / typecheck / lint / build all pass; pnpm -r typecheck clean.
User told this is a design-pending v1 — reconcile with /figma-component <Name> <url> --update once mockups exist.
What this skill deliberately does NOT do
No Figma reads. No get_design_context / get_variable_defs /
get_context_for_code_connect. The source of truth is legacy code.
No COMPLETE Code Connect and no figma: block in the spec. Those
require a real node; they're filled in by /figma-component --update later.
No hand-authored component token palette. When semantic tokens don't
cover a need, flag it for an upstream design-tokens pass — don't guess
per-component hex values to "match" the legacy look pixel-for-pixel.
Worked example: porting a simple variant component (Button-shaped)
Suppose <Name> has no Figma node and no --ui-<name>-* tier yet:
Readui-legacy/src/components/ui/<name>/<name>.tsx: cva with
variant: { default, outline, ghost }, size: { sm, default, lg }, uses
asChild via Radix Slot, classes like
bg-primary text-primary-foreground hover:bg-primary/90 and
border border-border bg-background hover:bg-accent/10.
Map tokens:bg-primary/text-primary-foreground carry over as-is (both
bridges resolve to --ui-background-brand-primary / --ui-glyph-on-brand-primary).
Replace the opacity hack hover:bg-primary/90 with the brand hover token
hover:bg-secondary (→ --ui-background-brand-secondary-hover family) or the
nearest semantic hover surface; replace border-border → keep (--ui-border-on-surface-border),
hover:bg-accent/10 → hover:bg-accent (--ui-background-surface-hover).
Map composition: drop Slot/asChild; add a render prop via
useRender + mergeProps.
Implement the component, tests, stories; write the NEEDS_FIGMA_URL.figma.tsx; write the 7-file spec with status: draft and no figma: block;
add the apps/docs page (demo + MDX + nav) and confirm uikit-docs build;
regenerate light+dark VR baselines; add a minor changeset.
