help.services.yml

services:
  plugin.manager.help_section:
    class: Drupal\help\HelpSectionManager
    parent: default_plugin_manager
    calls:
      - [setSearchManager, ['@?plugin.manager.search']]
    tags:
      - { name: plugin_manager_cache_clear }
  help.breadcrumb:
    class: Drupal\help\HelpBreadcrumbBuilder
    tags:
      - { name: breadcrumb_builder, priority: 900 }
    public: false
  plugin.manager.help_topic:
    class: Drupal\help\HelpTopicPluginManager
    arguments: ['@module_handler', '@theme_handler', '@cache.discovery', '%app.root%']
  Drupal\help\HelpTopicPluginManagerInterface: '@plugin.manager.help_topic'
  help.twig.loader:
    class: Drupal\help\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
  help_twig.extension:
    class: Drupal\help\HelpTwigExtension
    arguments: ['@access_manager', '@plugin.manager.help_topic', '@string_translation']
    tags:
      - { name: twig.extension }