farm-2.x-dev/modules/asset/structure/farm_structure.services.yml

services:
  farm_structure.map_render_event_subscriber:
    class: Drupal\farm_structure\EventSubscriber\MapRenderEventSubscriber
    arguments:
      [ '@entity_type.manager', '@farm_map.layer_style_loader' ]
    tags:
      - { name: 'event_subscriber' }