Contains the default access logic of this field.
See \Drupal\Core\TypedData\AccessibleInterface::access() for the parameter doucmentation. This method can be overriden by field sub classes to provide a different default access logic. That allows them to inherit the complete access() method which contains the access hook invocation logic.
bool TRUE if access to this field is allowed per default, FALSE otherwise.
public function defaultAccess($operation = 'view', AccountInterface $account = NULL) {
// Grant access per default.
return TRUE;
}