Kanpeki

Kanpeki is a copy-paste component library for React. Components are copied into your project (not installed as npm packages) via the shadcn CLI. Built on React Aria Components (accessibility), CVA beta (variants), and Tailwind CSS 4.1 (styling).

Docs: https://kanpeki.vercel.app

Quick Start

Install dependencies, create ~/lib/cva.ts, configure globals.css, then add components:

npx shadcn@latest add @kanpeki/button

Components are copied to ~/components/ui/<name>/. You own the code.

See references/installation-setup.md for full setup (deps, CVA config, globals.css, dark mode, path alias).

Component Architecture

Each component has: index.ts (exports), <name>.tsx (implementation), styles.ts (CVA variants).

• Simple components — single export: import { Button } from "~/components/ui/button"
• Multi-part components — namespace exports: import { Dialog } from "~/components/ui/dialog" → Dialog.Root, Dialog.Content, etc.

Multi-part components: Accordion, Breadcrumb, ButtonGroup, Calendar, Card, Carousel, Chart, Combobox, DateField, DatePicker, Dialog, Drawer, Field, InputGroup, ListBox, Menu, NumberField, Pagination, Popover, RadioGroup, Resizable, ScrollArea, SearchField, Select, Sheet, Sidebar, Slider, Table, Tabs, Toast, ToggleGroup, Tooltip.

Key rule: Always use composeRenderProps from react-aria-components on React Aria primitives — required for state selectors (pressed:, selected:, etc.). For plain HTML elements, call CVA directly.

See references/component-patterns.md for full examples (Button, Dialog, namespace pattern, customization).

Form System

3-layer architecture: Form > Field > Input component.

Field.Root's render prop connects to a React Aria form primitive (TextField, Select, NumberField, etc.) for automatic label association and validation.

Form Library Integration

1. Determine the form library:
   • React Hook Form? → See references/form-react-hook-form.md
   • TanStack Form? → See references/form-tanstack-form.md
   • Native HTML validation only? → Use React Aria <Form> + isRequired on primitives

All libraries use the same Field.Root render={<Primitive>} pattern. Field.Error accepts an errors prop — undefined entries are silently ignored.

See references/form-system.md for Field/InputGroup/ButtonGroup API details.

Styling & Theming

• CVA — variant definitions in styles.ts. Import cva from ~/lib/cva (not cva directly).
• cn() — class merging utility from ~/lib/cva. Wraps twMerge.
• OKLCH colors — defined in globals.css via @theme inline. Use light-dark() for automatic dark mode.
• Dark mode — next-themes (class strategy) + CSS light-dark(). Components auto-switch.
• React Aria selectors — pressed:, selected:, disabled:, entering:, exiting:, focus-visible:.
• Animations — tailwindcss-motion plugin: motion-opacity-in, motion-scale-in-95, motion-duration-200.

Override styles by passing className (twMerge resolves conflicts) or editing styles.ts directly.

See references/styling-and-theming.md for full token reference and CVA deep dive.

Common Pitfalls

Pitfall	Fix
Using className={Styles(...)} on React Aria components	Use composeRenderProps — required for state selectors
Missing "use client" directive	All interactive components need it (React Aria is client-only)
Importing cva from "cva"	Import from ~/lib/cva — includes twMerge hook
Old shadcn deps installed (class-variance-authority, clsx)	Remove them, use cva@beta + tailwind-merge
Using active: for press state	Use pressed: — React Aria prefix
Using @/ path alias	Kanpeki uses ~/

Component List

Install any component: npx shadcn@latest add @kanpeki/<name>

Layout & Structure: card, separator, aspect-ratio, resizable, scroll-area, sidebar, collapsible, carousel

Form Inputs: input, textarea, text-field, number-field, search-field, checkbox, radio-group, select, combobox, autocomplete, switch, slider, date-field, date-picker, calendar, input-otp, dropzone, field, form, input-group

Buttons & Actions: button, button-group, link, link-button, toggle, toggle-group

Overlays: dialog, drawer, sheet, popover, tooltip, menu

Data Display: table, list-box, accordion, tabs, avatar, badge, keyboard, chart

Feedback: alert, toast, progress, spinner, skeleton

Navigation: breadcrumb, pagination

Utilities: label

References

• Installation & Setup — full CSS, CVA config, dark mode, path alias
• Component Patterns — Button + Dialog examples, namespace pattern, customization
• Form System — Field/InputGroup/ButtonGroup API, native HTML validation
• React Hook Form — Controller patterns, all field types (Select, Checkbox, Switch, arrays)
• TanStack Form — form.Field patterns, Zod validation
• Styling & Theming — CVA deep dive, OKLCH tokens, React Aria selectors, animations