drupal/core/modules/help_topics/help_topics.services.yml

services:
  help.breadcrumb:
    class: Drupal\help_topics\HelpBreadcrumbBuilder
    arguments: ['@string_translation']
    tags:
      - { name: breadcrumb_builder, priority: 900 }
    public: false
  plugin.manager.help_topic:
    class: Drupal\help_topics\HelpTopicPluginManager
    arguments: ['@module_handler', '@theme_handler', '@cache.discovery', '%app.root%']
  help.twig.loader:
    class: Drupal\help_topics\HelpTopicTwigLoader
    arguments: ['%app.root%', '@module_handler', '@theme_handler']
    # Lowest core priority because loading help topics is not the usual case.
    tags:
    - { name: twig.loader, priority: -200 }
    public: false
  plugin.manager.help_section_topics:
    class: Drupal\help_topics\HelpSectionManager
    decorates: plugin.manager.help_section
    parent: plugin.manager.help_section
    calls:
      - [setSearchManager, ['@?plugin.manager.search']]
    tags:
      - { name: plugin_manager_cache_clear }
  help_twig.extension:
    class: Drupal\help_topics\HelpTwigExtension
    arguments: ['@access_manager', '@plugin.manager.help_topic', '@string_translation']
    tags:
      - { name: twig.extension }