mercury_editor-2.0.x-dev/modules/mercury_editor_templates/mercury_editor_templates.services.yml

services:
  mercury_editor.alter_component_urls_subscriber:
    class: \Drupal\mercury_editor_templates\EventSubscriber\LayoutParagraphsAllowedTypesSubscriber
    tags:
      - { name: 'event_subscriber' }
    arguments:
      - '@request_stack'
      - '@entity_type.manager'
      - '@current_user'