svelte-preprocess-css-global

A Svelte preprocessor to apply styles to all selectors globally using the :global(...) modifier with support css and postcss styles. More Information in the Svelte API

Input:

<!-- App.svelte -->
<style global type="text/postcss">
body {background-color: red;}
div a {
    color: red;
}
</style> 

Internal Output

:global(body) {background-color: red;}
:global(div) a {
    color: red;
}

Output

body{background-color:yellow}div a{color:red}

Installation

npm install --save-dev svelte-preprocess-css-global

Setup

Using rollup-plugin-svelte

// rollup.config.js
import svelte from 'rollup-plugin-svelte';
import { globalCSS } from 'svelte-preprocess-css-global';
...
 
export default {
  ...
  plugins: [
    ...
    svelte({
      preprocess: {
        style: globalCSS(),
      },
    }),
  ],
};

Using svelte-loader

// webpack.config.js
import { globalCSS } from 'svelte-preprocess-css-global';
 
module.exports = {
  ...
  module: {
    rules: [
      {
        test: /\.svelte$/,
        exclude: /node_modules/,
        use: {
          loader: "svelte-loader",
          options: {
            ...
            preprocess: {
                style: globalCSS()
            }
          }
        }
      },
      ...
    ]
  },
  ...
};

Passing options to postcss

You can pass options to postcss:

...
globalCSS({
  plugins: [
    ...
  ]
})

Usage

Now all <style> elements in your components that have a type="text/postcss" and global attribute will be preprocessed by sass.

<!-- App.svelte -->
<style global type="text/postcss">
body {background-color: red}
</style> 

Import from file

(does not suport hotreload in dev server!)

<!-- src/App.svelte -->
<style global type="text/postcss" src="global.css"></style>

src/global.css will be expected relative to folder of file App.svelte.

Import with @import

(does not suport hotreload in dev server!)

<!-- src/App.svelte -->
<style global type="text/postcss" >
@import "global.css" 
</style>

global.css will be expected relative to folder of file App.svelte.