ui_icons-1.0.x-dev/modules/ui_icons_library/ui_icons_library.routing.yml

ui_suite.index:
  path: "/admin/appearance/ui"
  defaults:
    _controller: '\Drupal\system\Controller\SystemController::systemAdminMenuBlockPage'
    _title: "UI libraries"
  requirements:
    _permission: "access patterns page+access components page+access_ui_styles_library+access_ui_examples_library+access ui icons library"

ui_icons_library.index:
  path: '/admin/appearance/ui/icons'
  defaults:
    _controller: 'Drupal\ui_icons_library\Controller\LibraryIndex::index'
    _title: 'Icons packs'
  requirements:
    _permission: 'access ui icons library'

ui_icons_library.mode:
  path: '/admin/icons/{mode}'
  defaults:
    _controller: 'Drupal\ui_icons_library\Controller\LibraryIndex::modeLibrary'
    mode: 'off'
  requirements:
    _permission: 'access ui icons library'

ui_icons_library.pack:
  path: '/admin/appearance/ui/icons/{pack_id}'
  defaults:
    _form: 'Drupal\ui_icons_library\Form\LibrarySearchForm'
    _title_callback: 'Drupal\ui_icons_library\Controller\LibraryIndex::getTitle'
  requirements:
    _permission: 'access ui icons library'