Set up Master CSS in React

Guide to setting up Master CSS in your React project.

Master CSS Static Extraction integrates build tools to scan project source code, extract class names, generate CSS rules, and write them into a virtual CSS module.

Zero runtime

Generate virtual CSS modules at build time


Scan all source code to extract class names

Cross-page caching

Download the CSS bundle for all pages at once

Quick start

Clone the example

Copy-paste the following commands to quickly start using the

You can skip all installation steps.

npx degit master-co/css/examples/react-with-static-extraction my-project
cd my-project
npm install @master/css-extractor.vite@beta
npm install
npm run dev


Create a project

If you don't have a React project, create one first. It's recommended to refer to Start a New React Project.

npm create vite@latest project -- --template react-ts
cd project

Install Master CSS Extractor

Install the Master CSS extractor into your project via package managers.

npm install @master/css-extractor.vite@beta

Initialize configuration file

Run npx mcss init to create a configuration file master.css.ts.

npx mcss init

Set up CSS extractor

  • Add a CSSExtractorPlugin to the vite plugins
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import { CSSExtractorPlugin } from '@master/css-extractor.vite'
export default defineConfig({
plugins: [

Import virtual CSS module

Import the virtual CSS module .virtual/master.css into the main.tsx.

import '.virtual/master.css';

Launch server

Run the Vite development server.

npm run dev -- --open

Hello world!

Now style your first element using Master CSS syntax!

export default function App() {
return (
<h1 className="font:40 font:heavy italic m:50 text:center">Hello World</h1>

Open your browser to watch the changes.


Hello World

MIT License © Aoyue Design LLC.