order:
 drupalSettings:
   ajax: test
 dependencies:
   - ajax_test/order-css-command
   - ajax_test/order-footer-js-command
   - ajax_test/order-header-js-command

order-css-command:
  css:
     theme:
       # Two CSS files (order should remain the same).
       a.css: {}
       b.css: {}

order-footer-js-command:
  js:
    footer.js: {}

order-header-js-command:
  header: true
  js:
    header.js: {}