The plugin_id of the default formatter for this field type.
This formatter must be available whenever the field type is available (i.e. provided by the field type module, or by a module the field type module depends on).
Type: string
public $default_formatter;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!Annotation!FieldType.php/property/FieldType::default_formatter/8.1.x