Mantine UI Library Skill

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.

v9.0 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 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:

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

// 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 — Installation, Vite setup, project structure
styling.md — MantineProvider, theme, CSS modules, style props, dark mode

Core Features

components.md — Core UI components patterns
hooks.md — @mantine/hooks utility hooks
forms.md — @mantine/form, useForm, validation
schedule.md — @mantine/schedule calendar scheduling

Development

testing.md — Vitest setup, custom render, mocking
eslint.md — eslint-config-mantine setup

Agent Skills: Mantine UI Library

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Skill Files