outside_in_entity_type_build

outside_in_entity_type_build(array &$entity_types)

function outside_in_entity_type_build(array &$entity_types) {
  /* @var $entity_types \Drupal\Core\Entity\EntityTypeInterface[] */
  $entity_types['block']
  ->setFormClass('offcanvas', BlockEntityOffCanvasForm::class)
    ->setLinkTemplate('offcanvas-form', '/admin/structure/block/manage/{block}/offcanvas');
}