eck-8.x-1.x-dev/eck.links.menu.yml

# Define the menu links for this module

eck.entity_type.admin.structure.settings:
  title: ECK Entity Types
  description: 'Configure ECK entity types'
  route_name: eck.entity_type.list
  parent: system.admin_structure

eck.entity_types:
  deriver: Drupal\eck\Plugin\Derivative\EckTypesMenuItemsDeriver