material_base-8.x-2.x-dev/themes/material_base_mdc/material_base_mdc.libraries.yml

mdc:
  css:
    theme:
      ../../dist/css/mdc.css: { minified: true, weight: 20 }
  js:
    https://unpkg.com/material-components-web@14.0.0/dist/material-components-web.min.js: { type: external, minified: true, weight: -1 }
    ../../dist/js/mdc.js: { minified: true }
  dependencies:
    - core/drupal
    - core/once