Shadcn

shadcn/ui Community Best Practices

Current best-practices guide for shadcn/ui applications. Before applying primitive-specific guidance, inspect whether the checked-in components use Radix UI or Base UI; current shadcn supports both and their composition APIs differ.

When to Apply

Reference these guidelines when:

• Writing new shadcn/ui components or composing primitives
• Implementing forms with React Hook Form and Zod validation
• Building data tables or handling large dataset displays
• Customizing themes or adding dark mode support
• Reviewing code for accessibility compliance

Rule Categories by Priority

Quick Reference

1. Component Architecture (CRITICAL)

• arch-use-asChild-for-custom-triggers - Use the generated primitive's composition API
• arch-preserve-radix-primitive-structure - Maintain Radix compound component hierarchy
• arch-extend-variants-with-cva - Use Class Variance Authority for type-safe variants
• arch-use-cn-for-class-merging - Use cn() utility for safe Tailwind class merging
• arch-forward-refs-for-composable-components - Forward refs for form and focus integration
• arch-isolate-component-variants - Separate base styles from variant-specific styles

2. Accessibility Preservation (CRITICAL)

• ally-preserve-aria-attributes - Keep Radix ARIA attributes intact
• ally-provide-sr-only-labels - Add screen reader labels for icon buttons
• ally-maintain-focus-management - Preserve focus trapping in modals
• ally-preserve-keyboard-navigation - Keep WAI-ARIA keyboard patterns
• ally-ensure-color-contrast - Maintain WCAG color contrast ratios

3. Styling & Theming (HIGH)

• style-use-css-variables-for-theming - Use CSS variables for theme colors
• style-avoid-important-overrides - Prefer variants and class composition over important overrides
• style-use-tailwind-theme-extend - Define Tailwind v4 theme tokens in CSS
• style-consistent-spacing-scale - Use consistent Tailwind spacing scale
• style-responsive-design-patterns - Apply mobile-first responsive design
• style-dark-mode-support - Support dark mode with CSS variables

4. Form Patterns (HIGH)

• form-use-react-hook-form-integration - Integrate with React Hook Form
• form-use-zod-for-schema-validation - Use Zod for type-safe validation
• form-show-validation-errors-correctly - Show errors at appropriate times
• form-handle-async-validation - Debounce async validation calls
• form-reset-form-state-correctly - Reset form state after submission

5. Data Display (MEDIUM-HIGH)

• data-use-tanstack-table-for-complex-tables - Use TanStack Table for sorting/filtering
• data-virtualize-large-lists - Virtualize lists with 100+ items
• data-use-skeleton-loading-states - Use Skeleton for loading states
• data-paginate-server-side - Paginate large datasets server-side
• data-empty-states-with-guidance - Provide actionable empty states

6. Component Composition (MEDIUM)

• comp-compose-with-compound-components - Use compound component patterns
• comp-use-drawer-for-mobile-modals - Use Drawer on mobile devices
• comp-combine-command-with-popover - Create searchable selects with Command
• comp-nest-dialogs-correctly - Manage nested dialog focus correctly
• comp-create-reusable-form-fields - Extract reusable form field components
• comp-use-slot-pattern-for-flexibility - Use slot pattern for flexible content

7. Performance Optimization (MEDIUM)

• perf-lazy-load-heavy-components - Lazy load components over 50KB
• perf-memoize-expensive-renders - Memoize list items and expensive components
• perf-optimize-icon-imports - Use direct imports for Lucide icons
• perf-avoid-unnecessary-rerenders-in-forms - Isolate form field watching
• perf-debounce-search-inputs - Debounce search and filter inputs

8. State Management (LOW-MEDIUM)

• state-prefer-uncontrolled-for-simple-inputs - Use uncontrolled for simple forms
• state-lift-state-to-appropriate-level - Lift state to lowest common ancestor
• state-use-controlled-dialog-state - Control dialogs for programmatic access
• state-colocate-state-with-components - Keep state close to where it's used

How to Use

Read individual reference files for detailed explanations and code examples:

Full Compiled Document

For a single-file reference containing all rules, see AGENTS.md.

Reference Files