A simple guide to setup Atomizer with SvelteKit.

Create a new project

If you do not have a project setup already, you can create a new one using SvelteKit’s Getting Started page.

npm create svelte@latest my-app
cd my-app
npm install

Install the plugin

For a SvelteKit project, the postcss-atomizer library makes it easy to setup Atomizer. SvelteKit recommends installing the svelte-preprocess module to automatically transform the code in your Svelte templates.

npm i postcss-atomizer svelte-preprocess postcss postcss-load-config -D

Enable PostCSS

Update the svelte.config.js to include the svelte-preprocess library.

import preprocess from "svelte-preprocess";

const config = {
    // ...
    preprocess: [
            postcss: true,

Create your Atomizer config

Create the atomizer.config.cjs config file so that Atomizer can parse your SvelteKit files.

module.exports = {
    content: [

Create the PostCSS config

Create the postcss.config.cjs file to configure the Atomizer plugin.

const atomizer = require('postcss-atomizer');

module.exports = {
    plugins: [
            config: './atomizer.config.cjs',

Add the CSS file

Create an empty src/app.css file for PostCSS to process and then import it at the top of the src/routes/+page.svelte file.

    import "../app.css";

Start your build process

Run your build setup as configured in your project’s package.json.

npm run dev

Begin using Atomizer

Start adding Atomizer classes to the src/routes/+page.svelte file.

<h1 className="Fw(b) Fz(2rem)">Welcome!</h1>