Set up Master CSS in Svelte

Guide to setting up Master CSS in your Svelte 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

Semi-dynamic

Scan all source code to extract class names

Cross-page caching

Download the CSS bundle for all pages at once

https://svelte.se.beta.css.master.co

Quick start

Clone the example

Copy-paste the following commands to quickly start using the svelte.se.beta.css.master.co.

You can skip all installation steps.

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

Installation

Create a project

If you don't have a Svelte project, create one first. It's recommended to refer to Svelte Kit.

npm create svelte@latest project
cd project
npm install

Install Master CSS

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

Create a vite.config.ts file
Add a CSSExtractorPlugin to the vite plugins

import { defineConfig } from 'vite'
import { CSSExtractorPlugin } from '@master/css-extractor.vite'
 
export default defineConfig({
    plugins: [
        CSSExtractorPlugin()
    ]
})

Import virtual CSS module

Import the virtual CSS module .virtual/master.css into the src/routes/+layout.svelte.

<script>
    import Header from './Header.svelte';
    import './styles.css';
    import '.virtual/master.css';
</script>
…

Launch server

Run npm run dev -- --open to start your Vite development server

npm run dev -- --open

Start using Master CSS

Now style your first element using Master CSS syntax!

<h1 class="font:40 fg:blue font:heavy italic m:50 text:center">Hello World</h1>

Open your browser to watch the changes.

localhost:5173