public ThemeHandlerInterface::getBaseThemes(array $themes, $theme)
Finds all the base themes for the specified theme.
Themes can inherit templates and function implementations from earlier themes.
\Drupal\Core\Extension\Extension[] $themes: An array of available themes.
string $theme: The name of the theme whose base we are looking for.
array Returns an array of all of the theme's ancestors; the first element's value will be NULL if an error occurred.
public function getBaseThemes(array $themes, $theme);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Extension!ThemeHandlerInterface.php/function/ThemeHandlerInterface::getBaseThemes/8.1.x