mantine-dev

What this skill does

# Mantine UI Library

Mantine is a fully-featured React components library with TypeScript support. It provides 100+ hooks and components with native dark mode, CSS-in-JS via CSS modules, and excellent accessibility.

## v9.2.2 Highlights

- Accessibility fixes landed across selection controls and sliders: `Checkbox`, `Radio`, and `Switch` now wire error ids into `aria-describedby`, while `Slider` and `RangeSlider` support `aria-valuetext`.
- Overlay/input behavior was refined with submenu safe polygon support, duplicate modal-id fixes, PinInput keyboard fixes, and ScrollArea/TreeSelect interaction fixes.
- Patch fixes in `9.2.2` cover `Pill` overflow, `Input` sections under local `dir` overrides, `Select` clear buttons for falsy primitive values, Modal/Drawer/Spotlight attribute types, and safer `Menu.Sub` safe-area polygon option forwarding.
- `@mantine/hooks` `use-mask` now preserves undo and cursor position across paste/cut flows, and `@mantine/tiptap` controls avoid errors after the editor is destroyed or not initialized.
- Forms and theming were hardened: `@mantine/form` handlers are more stable, default validators no longer force async results unexpectedly, and `mergeMantineTheme` no longer mutates `DEFAULT_THEME.headings`.
- `@mantine/schedule` continues to mature with better multi-day overlap rendering and corrected positioning for `intervalMinutes={60}`.

## v9.0 Breaking Changes

- **React 19.2+** required for all `@mantine/*` packages
- **Tiptap 3+** required for `@mantine/tiptap`
- **Recharts 3+** required for `@mantine/charts` (no migration needed)
- Follow the official [8.x → 9.x migration guide](https://mantine.dev/changelog/9-0-0/) for full details

## Focus

This skill focuses on:

- **Vite** + **TypeScript** setup (not Next.js or CRA)
- CSS modules with PostCSS preset
- Vitest for testing
- ESLint with eslint-config-mantine

## Installation

See `references/getting-started.md` for Vite template setup, manual installation, and optional packages.

## PostCSS Configuration

Create `postcss.config.cjs`:

```js
module.exports = {
  plugins: {
    "postcss-preset-mantine": {},
    "postcss-simple-vars": {
      variables: {
        "mantine-breakpoint-xs": "36em",
        "mantine-breakpoint-sm": "48em",
        "mantine-breakpoint-md": "62em",
        "mantine-breakpoint-lg": "75em",
        "mantine-breakpoint-xl": "88em",
      },
    },
  },
};
```

## App Setup

```tsx
// src/App.tsx
import "@mantine/core/styles.css";
// Other style imports as needed:
// import '@mantine/dates/styles.css';
// import '@mantine/notifications/styles.css';

import { MantineProvider, createTheme } from "@mantine/core";

const theme = createTheme({
  // Theme customization here
});

function App() {
  return <MantineProvider theme={theme}>{/* Your app */}</MantineProvider>;
}
```

## Critical Prohibitions

- Do NOT skip MantineProvider wrapper — all components require it
- Do NOT forget to import `@mantine/core/styles.css` — components won't style without it
- Do NOT mix Mantine with other UI libraries (e.g., Chakra, MUI) in same project
- Do NOT use inline styles for theme values — use CSS variables or theme object
- Do NOT skip PostCSS setup — responsive mixins won't work
- Do NOT forget `key={form.key('path')}` when using uncontrolled forms

## Core Concepts

### 1. MantineProvider

Wraps your app, provides theme context and color scheme management.

### 2. Theme Object

Customize colors, typography, spacing, component default props.

### 3. Style Props

All components accept style props like `mt`, `p`, `c`, `bg`, etc.

### 4. CSS Variables

All theme values exposed as CSS variables (e.g., `--mantine-color-blue-6`).

### 5. Polymorphic Components

Many components support `component` prop to render as different elements.

## Definition of Done

- [ ] MantineProvider wraps the app
- [ ] Styles imported (`@mantine/core/styles.css`)
- [ ] PostCSS configured with mantine-preset
- [ ] Theme customization in createTheme
- [ ] Color scheme (light/dark) handled
- [ ] TypeScript types working
- [ ] Tests pass with Vitest + custom render

## References (Detailed Guides)

### Setup & Configuration

- [getting-started.md](references/getting-started.md) — Installation, Vite setup, project structure
- [styling.md](references/styling.md) — MantineProvider, theme, CSS modules, style props, dark mode

### Core Features

- [components.md](references/components.md) — Core UI components patterns
- [hooks.md](references/hooks.md) — @mantine/hooks utility hooks
- [forms.md](references/forms.md) — @mantine/form, useForm, validation
- [schedule.md](references/schedule.md) — @mantine/schedule calendar scheduling

### Development

- [testing.md](references/testing.md) — Vitest setup, custom render, mocking
- [eslint.md](references/eslint.md) — eslint-config-mantine setup

## Links

- [Documentation](https://mantine.dev)
- [Releases](https://github.com/mantinedev/mantine/releases)
- [GitHub](https://github.com/mantinedev/mantine)
- [npm](https://www.npmjs.com/package/@mantine/core)
- [Vite template](https://github.com/mantinedev/vite-template)
- [LLM docs](https://mantine.dev/llms.txt)