public TypedDataInterface::getRoot()
Returns the root of the typed data tree.
Returns the root data for a tree of typed data objects; e.g. for an entity field item the root of the tree is its parent entity object.
\Drupal\Core\TypedData\TraversableTypedDataInterface The root data structure, either complex data or a list.
public function getRoot();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!TypedData!TypedDataInterface.php/function/TypedDataInterface::getRoot/8.1.x