the resource folder is included in your assembly because the folder is listed in the asset array in angular-cli.json.
everything in the asset array is copied "as is" on the assembly.
if you add your css and scripts to -arrays styles and scripts in angular-cli.json, they will be added to the assembly so that all your css are in styles.bundle.js (yes js).
css js index.html, angular -cli index.html.
, , , " ", , (, https://www.npmjs.com/package/minifier) angular -cli , .