Can ES6’s module loader also load assets (html/css/…)

If you use SystemJS then you can load assets by using plugins:

// Will generate a <link> element for my/file.css
System.import('my/file.css!')
    .then(() => console.log('CSS file loaded'));

Alternatively, you can use an import statement. This will make sure that the CSS file is loaded before the your script executes:

import 'my/file.css!';

Finally, you can retrieve the contents of the file using the text plugin:

import cssContent from 'my/file.css!text';
console.log('CSS file contents: ', cssContent);

Another option is to add the css as a dependency in JSPM config files. Basically adding the dependency in the specific package .json file and then running ‘jspm install’ which will add the override to package.js & jspm.config.js