public ListDataDefinition::setDataType($type)
Sets the data type.
string $type: The data type to set.
static The object itself for chaining.
Overrides DataDefinition::setDataType
public function setDataType($type) { if ($type != 'list') { throw new \LogicException('Lists must always be of data type "list".'); } }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!ListDataDefinition.php/function/ListDataDefinition::setDataType/8.1.x