July 11, 2022

๐Ÿš€ Style your Svelte website faster with Stylify CSS

Style your Svelte website faster and intuitively with Stylify.

Stylify + Svelte + Vite. Style your Svelte website faster with Stylify. Don't study selectors and syntax. Use pure CSS syntax and get generated CSS with advanced optimization for production.

For easier start, you can checkout the Stylify Stackblitz playground ๐ŸŽฎ.

๐Ÿ’Ž Stylify Introduction

Stylify generates CSS dynamically based on what you write. The syntax is similar to css property:value. Defined utilities are combined with components selectors and in production minified to bare minimum like .color\:red,.button {color:red} to ._zx, ._ga{color:red}.

Stylify allows you to get very small bundles, generate additional lazyloaded CSS chunks and style the page by writting HTML and selectors ๐ŸคŸ.

๐Ÿš€ Svelte Setup

The easiest way to Setup the Svelte is using cli:

  • Run yarn create vite app
  • Select svelte or svelte-ts
  • Then cd app

This way you will get the default Svelte application skeleton.

๐Ÿ”Œ Stylify Integration

Install the @stylify/unplugin package using NPM or Yarn:

yarn add @stylify/unplugin
npm i @stylify/unplugin

Open the vite.config.js and copy the following content into it:

import { defineConfig } from 'vite'
import { svelte } from '@sveltejs/vite-plugin-svelte'
import { vitePlugin } from '@stylify/unplugin';

const stylifyPlugin = vitePlugin({
    transformIncludeFilter: (id) => {
        return id.endsWith('svelte');
    bundles: [{
        outputFile: './src/stylify.css',
        files: ['./src/**/*.svelte'],

export default defineConfig({
    plugins: [stylifyPlugin, svelte()]

The last step, open the src/main.js and add path to stylify.css:

// ...
import './stylify.css'

Styling the website

If yout copy the code bellow into the src/App.svelte and run yarn dev you will get a styled Hello World! ๐ŸŽ‰ text:

<main class="max-width:800px margin:0__auto">
    <h1 class="text-align:center margin-top:100px font-size:42px">
        Hello World! ๐ŸŽ‰

Stylify watches any change in the files that matches mask in the bundle files and generates css into the src/stylify.css.

If you add for example color:blue the CSS will be automatically updated ๐ŸŽ‰.

Go ahead and try Stylify directly on Stackblitz.com ๐Ÿ’ก.


To avoid bloated templates with utilities, you can use components directly in files, where they are used through content options (expects javascript object without brackets) or in the compiler config.

  container: 'max-width:800px margin:0__auto',
  title: 'text-align:center margin-top:100px font-size:42px'
<main class="container">
    <h1 class="title">
        Hello World! ๐ŸŽ‰


If you like clean code, you also want avoid hardcoded values in selectors. Variables can be defined the same way as components:

  titleFontSize: '42px',
  containerWidth: '800px'

  container: 'max-width:$containerWidth margin:0__auto',
  title: 'text-align:center margin-top:100px font-size:$titleFontSize'
<main class="container">
    <h1 class="title">
        Hello World! ๐ŸŽ‰

Building for production

If you run yarn build + yarn preview, the svelte markup will be mangled to this:

<main class="_7tcrv">
    <h1 class="_88io">
        Hello World! ๐ŸŽ‰

The css is shortened too:

:root {--titleFontSize: 42px;--containerWidth: 800px;}
._m0vnad,._7tcrv{margin:0 auto}

Configure anything youย need

The examples above doesn't include everything Stylify can do:

Feel free to checkout the docs to learn more ๐Ÿ’Ž.