Style your Svelte website faster with Stylify CSS

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 an easier start, you can check out the Stylify Stackblitz playground 🎮.

💎 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 writing HTML and selectors 🤟.

🚀 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.

🔌 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()]
});

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

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

Styling the website

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

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

Stylify watches any change in the files that matches the 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 🎉.

Go ahead and try Stylify directly on Stackblitz.com 💡.

Components

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.

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

Variables

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

<!--
stylify-variables
  titleFontSize: '42px',
  containerWidth: '800px'
/stylify-variables

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

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! 🎉
    </h1>
</main>

The css is shortened too:

:root {--titleFontSize: 42px;--containerWidth: 800px;}
._bcda8,._7tcrv{max-width:800px}
._m0vnad,._7tcrv{margin:0 auto}
._1vegb8,._88io{text-align:center}
._jimir,._88io{margin-top:100px}
._qe393,._88io{font-size:42px}