public EntityTypeInterface::hasHandlerClass($handler_type, $nested = FALSE)
Determines if there is a handler for a given type.
string $handler_type: The type of handler to check.
bool $nested: (optional) If this handler has a nested definition. Defaults to FALSE.
bool TRUE if a handler of this type exists, FALSE otherwise.
public function hasHandlerClass($handler_type, $nested = FALSE);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityTypeInterface.php/function/EntityTypeInterface::hasHandlerClass/8.1.x