Runs PostCSS on all .css files, including ones generated from Sass, Vue, and Svelte.

Install @snowpack/plugin-postcss, PostCSS, and your PostCSS plugins (not shown):

npm install --save-dev @snowpack/plugin-postcss postcss

Then add this plugin to your Snowpack config:

// snowpack.config.mjs
export default {
+  plugins: ['@snowpack/plugin-postcss'],
};

Lastly, add a postcss.config.js file. By default, @snowpack/plugin-postcss looks for this in the root directory of your project, but you can customize this with the config option.

module.exports = {
  plugins: [
    // Replace below with your plugins
    require('cssnano'),
    require('postcss-preset-env')
  ],
};