/shadcn-ui

name: shadcn-ui
description: "Install and configure shadcn/ui components for React projects. Guides component selection, installation order, dependency management, customisation with semantic tokens, and common UI recipes (forms, data tables, navigation, modals). Use after tailwind-theme-builder has set up the theme infrastructure, when adding components, building forms, creating data tables, or setting up navigation."
compatibility: claude-code-only

shadcn/ui Components

Add shadcn/ui components to a themed React project. This skill runs AFTER `tailwind-theme-builder` has set up CSS variables, ThemeProvider, and dark mode. It handles component installation, customisation, and combining components into working patterns.

**Prerequisite**: Theme infrastructure must exist (CSS variables, components.json, cn() utility). Use `tailwind-theme-builder` first if not set up.

Installation Order

Install components in dependency order. Foundation components first, then feature components:

Foundation (install first)

pnpm dlx shadcn@latest add button
pnpm dlx shadcn@latest add input label
pnpm dlx shadcn@latest add card

Feature Components (install as needed)

# Forms
pnpm dlx shadcn@latest add form        # needs: react-hook-form, zod, @hookform/resolvers
pnpm dlx shadcn@latest add textarea select checkbox switch

# Feedback
pnpm dlx shadcn@latest add toast        # needs: sonner
pnpm dlx shadcn@latest add alert badge

# Overlay
pnpm dlx shadcn@latest add dialog sheet popover dropdown-menu

# Data Display
pnpm dlx shadcn@latest add table        # for data tables, also: @tanstack/react-table
pnpm dlx shadcn@latest add tabs separator avatar

# Navigation
pnpm dlx shadcn@latest add navigation-menu command

External Dependencies

| Component | Requires | |-----------|----------| | Form | `react-hook-form`, `zod`, `@hookform/resolvers` | | Toast | `sonner` | | Data Table | `@tanstack/react-table` | | Command | `cmdk` | | Date Picker | `date-fns` (optional) |

Install external deps separately: `pnpm add react-hook-form zod @hookform/resolvers`

Known Gotchas

These are documented corrections that prevent common bugs:

Radix Select — No Empty Strings

// Don't use empty string values
<SelectItem value="">All</SelectItem>           // BREAKS

// Use sentinel value
<SelectItem value="__any__">All</SelectItem>    // WORKS
const actual = value === "__any__" ? "" : value

React Hook Form — Null Values

// Don't spread {...field} — it passes null which Input rejects
<Input
  value={field.value ?? ''}
  onChange={field.onChange}
  onBlur={field.onBlur}
  name={field.name}
  ref={field.ref}
/>

Lucide Icons — Tree-Shaking

// Don't use dynamic import — icons get tree-shaken in production
import * as LucideIcons from 'lucide-react'
const Icon = LucideIcons[iconName]  // BREAKS in prod

// Use explicit map
import { Home, Users, Settings, type LucideIcon } from 'lucide-react'
const ICON_MAP: Record<string, LucideIcon> = { Home, Users, Settings }
const Icon = ICON_MAP[iconName]

Dialog Width Override

// Default sm:max-w-lg won't be overridden by max-w-6xl
<DialogContent className="max-w-6xl">       // DOESN'T WORK

// Use same breakpoint prefix
<DialogContent className="sm:max-w-6xl">    // WORKS

Customising Components

shadcn components use semantic CSS tokens from your theme. To customise:

Variant extension

Add custom variants by editing the component file in `src/components/ui/`:

// button.tsx — add a "brand" variant
const buttonVariants = cva("...", {
  variants: {
    variant: {
      default: "bg-primary text-primary-foreground",
      brand: "bg-brand text-brand-foreground hover:bg-brand/90",
      // ... existing variants
    },
  },
})

Colour overrides

Use semantic tokens from your theme — never raw Tailwind colours:

// Don't use raw colours
<Button className="bg-blue-500">             // WRONG

// Use semantic tokens
<Button className="bg-primary">              // RIGHT
<Card className="bg-card text-card-foreground">  // RIGHT

Workflow

Step 1: Assess Needs

Determine what UI patterns the project needs:

| Need | Components | |------|-----------| | Forms with validation | Form, Input, Label, Select, Textarea, Button, Toast | | Data display with sorting | Table, Badge, Pagination | | Admin CRUD interface | Dialog, Form, Table, Button, Toast | | Marketing/landing page | Card, Button, Badge, Separator | | Settings/preferences | Tabs, Form, Switch, Select, Toast | | Navigation | NavigationMenu (desktop), Sheet (mobile), ModeToggle |

Step 2: Install Components

Install foundation first, then feature components for the identified needs. Use the commands above.

Step 3: Build Recipes

Combine components into working patterns. See [references/recipes.md](references/recipes.md) for complete working examples:

• **Contact Form** — Form + Input + Textarea + Button + Toast
• **Data Table** — Table + Column sorting + Pagination + Search
• **Modal CRUD** — Dialog + Form + Button
• **Navigation** — Sheet + NavigationMenu + ModeToggle
• **Settings Page** — Tabs + Form + Switch + Select + Toast

Step 4: Customise

Apply project-specific colours and variants using semantic tokens from the theme.

Reference Files

| When | Read | |------|------| | Choosing components, install commands, props | [references/component-catalogue.md](references/component-catalogue.md) | | Building complete UI patterns | [references/recipes.md](references/recipes.md) |