class TranslatorPlugin

FileTranslator in translators/tmgmt_file/src/Plugin/tmgmt/Translator/FileTranslator.php

File translator.

LocalTranslator in translators/tmgmt_local/src/Plugin/tmgmt/Translator/LocalTranslator.php

Drupal user provider.

TestTranslator in tmgmt_test/src/Plugin/tmgmt/Translator/TestTranslator.php

Test source plugin implementation.

class TranslatorPlugin extends Plugin {

  /**
   * The plugin ID.
   *
   * @var string
   */
  public $id;

  /**
   * The human-readable name of the translator.
   *
   * @ingroup plugin_translatable
   *
   * @var \Drupal\Core\Annotation\Translation
   */
  public $label;

  /**
   * A short description of the translator.
   *
   * @ingroup plugin_translatable
   *
   * @var \Drupal\Core\Annotation\Translation
   */
  public $description;

  /**
   * The name of the field formatter class.
   *
   * This is not provided manually, it will be added by the discovery mechanism.
   *
   * @var string
   */
  public $class;

  /**
   * An array with default values for this translator.
   *
   * @var array
   */
  public $default_settings = array();

  /**
   * Whether the plugin supports files.
   *
   * @var bool
   */
  public $files = FALSE;

}