rollup-plugin-svelte & modular-css

rollup.config.js

// Example usage of svelte-preprocess support for modular-css
// https://github.com/tivac/modular-css/compare/svelte-preprocessing?expand=1

const { preprocess, plugin } = require("modular-css-rollup/svelte")({
  // normal modular-css args passed to processor
  // https://github.com/tivac/modular-css/blob/master/docs/api.md#options
  css : "./dist/out.css"
});

module.exports = {
  input : "Component.html",
  output : {
    file : "./dist/out.js",
    format : "iife"
  },
  plugins: [
    require("rollup-plugin-svelte", {
      preprocess
    }),
    plugin
  ]
};