onlyone-8.x-1.x-dev/onlyone.routing.yml

onlyone.config_content_types:
  path: /admin/config/content/onlyone
  defaults:
    _title: 'Only One'
    _form: \Drupal\onlyone\Form\ConfigContentTypes
  requirements:
    _permission: 'administer onlyone'
  options:
    _admin_route: TRUE

onlyone.admin_settings:
  path: '/admin/config/content/onlyone/settings'
  defaults:
    _form: '\Drupal\onlyone\Form\OnlyOneAdminSettings'
    _title: 'Only One Settings'
  requirements:
    _permission: 'administer onlyone'
  options:
    _admin_route: TRUE

route_callbacks:
  - '\Drupal\onlyone\Routing\OnlyOneRoutes::routes'