public ThemeHandlerInterface::rebuildThemeData()
Scans and collects theme extension data and their engines.
\Drupal\Core\Extension\Extension[] An associative array of theme extensions.
public function rebuildThemeData();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Extension!ThemeHandlerInterface.php/function/ThemeHandlerInterface::rebuildThemeData/8.1.x