How to add Compass (SASS) to build process?

If you’re not totally attached to Compass, I have Bourbon working:

  • add @import "_bourbon.scss"; to your app.scss
  • define a custom sass configuration file in package.json using ionic_sass as described here
  • copy the stock one from node_modules/@ionic/app-scripts/config/sass_config.js and add 'node_modules/bourbon/app/assets/stylesheets' to the includePaths stanza of it