Migration Guide
Here you may find guidance on upgrading Attractions from one major version to another.
From v2.x to v3.x
The main change in version 3 is the migration to Sass modules.
If you have existing code that used Sass for styling and was using the old @import statements, consider using the automatic Sass Migrator tool first. 
Heads up: if your styles used imports that relied on includePaths, you can still make Sass Migrator understand them by setting the SASS_PATH environment variable to the path that you previously had in your includePaths Sass compiler option. 
Once your code is ready for Sass modules, replace Node Sass (node-sass) with Dart Sass (sass). 
Update your rollup.config.js to use the new Attractions importers: 
import autoPreprocess from 'svelte-preprocess';
import makeAttractionsImporter from 'attractions/importer.js';
const preprocessChain = [
  autoPreprocess({
    scss: {
      importer: makeAttractionsImporter({
        // If you previously had a file that was overriding Attractions variables,
        //   provide the path to it here.
        // If it was empty, you may delete it, omit this parameter
        //   and call the function with no arguments.
        themeFile: './static/css/_attractions-theme.scss',
      }),
      includePaths: ['./static/css'],
    },
  }),
];Lastly, if your _attractions-theme.scss had any variable overrides, move them to the module configuration. 
Before:
@import '_attractions-theme.scss';
$font: 'Open Sans', sans-serif;
$main: green;
$my-custom-variable: 1px;After:
@forward "~attractions/_variables" with (
  $font: ('Open Sans', sans-serif),
  $main: green;
);
$my-custom-variable: 1px;