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

1. Install Dependencies

npm install cva@beta tailwind-merge tailwindcss-motion tailwindcss-react-aria-components react-aria-components -D

Remove shadcn defaults if present:

npm remove class-variance-authority clsx tw-animate-css

2. Create CVA Utility

src/lib/cva.ts:

import { defineConfig } from "cva";
import { twMerge } from "tailwind-merge";

export const { cva, cx: cn, compose } = defineConfig({
  hooks: {
    onComplete: (className) => twMerge(className),
  },
});

3. Configure Styles

Add to globals.css: Tailwind imports, plugins (tailwindcss-react-aria-components, tailwindcss-motion), @custom-variant dark, and OKLCH color tokens via @theme inline.

See references/installation-setup.md for full CSS.

4. Add Components

npx shadcn@latest add @kanpeki/button
npx shadcn@latest add @kanpeki/dialog
npx shadcn@latest add @kanpeki/field

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

Component Architecture

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

Simple Components

Single export. Example:

import { Button } from "~/components/ui/button";

<Button variant="outline" size="lg">Click me</Button>

Multi-Part Components

Namespace exports for compound components:

import { Dialog } from "~/components/ui/dialog";

<Dialog.Root>
  <Button>Open</Button>
  <Dialog.Overlay>
    <Dialog.Modal>
      <Dialog.Content>
        <Dialog.Header>
          <Dialog.Title>Title</Dialog.Title>
          <Dialog.Description>Description</Dialog.Description>
        </Dialog.Header>
        <Dialog.Footer>
          <Button>Save</Button>
        </Dialog.Footer>
        <Dialog.Close />
      </Dialog.Content>
    </Dialog.Modal>
  </Dialog.Overlay>
</Dialog.Root>

Multi-part components with namespace exports: 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.

See references/component-patterns.md for full examples.

Key Pattern: composeRenderProps

Always use composeRenderProps from react-aria-components when wrapping React Aria primitives. This ensures state-based selectors (pressed:, selected:, etc.) work.

import { composeRenderProps } from "react-aria-components";

className={composeRenderProps(className, (className) =>
  Styles({ className, variant })
)}

For plain HTML elements (div, p), call CVA directly: className={Styles({ className })}.

Form System

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

Field Composition

import { Field } from "~/components/ui/field";
import { Input } from "~/components/ui/input";
import { TextField } from "~/components/ui/text-field";

<Field.Root render={<TextField type="email" isRequired />}>
  <Field.Label>Email</Field.Label>
  <Input placeholder="john@example.com" />
  <Field.Description>Help text</Field.Description>
  <Field.Error />
</Field.Root>

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

InputGroup

import { InputGroup } from "~/components/ui/input-group";

<InputGroup.Root>
  <InputGroup.Addon><SearchIcon /></InputGroup.Addon>
  <InputGroup.Input placeholder="Search..." />
</InputGroup.Root>

TanStack Form

<form.Field name="title">
  {(field) => (
    <Field.Root
      render={
        <TextField
          isInvalid={field.state.meta.isTouched && !field.state.meta.isValid}
          onChange={field.handleChange}
          onBlur={field.handleBlur}
          value={field.state.value}
        />
      }
    >
      <Field.Label>Title</Field.Label>
      <Input />
      <Field.Error errors={field.state.meta.errors} />
    </Field.Root>
  )}
</form.Field>

See references/form-system.md for full TanStack Form example with Zod validation.

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, TanStack Form + Zod example
• Styling & Theming — CVA deep dive, OKLCH tokens, React Aria selectors, animations