pluginreference-2.0.0/pluginreference.routing.yml

pluginreference.plugin_autocomplete:
  path: '/pluginreference/autocomplete/{target_type}/{selection_handler}/{selection_settings_key}'
  defaults:
    _controller: '\Drupal\pluginreference\Controller\PluginReferenceAutocompleteController::handleAutocomplete'
  requirements:
    _permission: 'pluginreference autocomplete view results'