An array of DataType plugin IDs for which this constraint applies. Valid values are any types registered by the typed data API, or an array of multiple type names. For supporting all types, FALSE may be specified. The key defaults to an empty array, which indicates no types are supported.
Type: string|string[]|false
\Drupal\Core\TypedData\Annotation\DataType
public $type = [];
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Validation!Annotation!Constraint.php/property/Constraint::type/8.1.x