public FormStateInterface::loadInclude($module, $type, $name = NULL)
Ensures an include file is loaded whenever the form is processed.
Example:
// Load node.admin.inc from Node module. $form_state->loadInclude('node', 'inc', 'node.admin');
Use this function instead of module_load_include() from inside a form constructor or any form processing logic as it ensures that the include file is loaded whenever the form is processed. In contrast to using module_load_include() directly, this method makes sure the include file is correctly loaded also if the form is cached.
string $module: The module to which the include file belongs.
string $type: The include file's type (file extension).
string|null $name: (optional) The base file name (without the $type extension). If omitted, $module is used; i.e., resulting in "$module.$type" by default.
string|false The filepath of the loaded include file, or FALSE if the include file was not found or has been loaded already.
public function loadInclude($module, $type, $name = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormStateInterface.php/function/FormStateInterface::loadInclude/8.1.x