public static ImageToolkitInterface::getSupportedExtensions()
Returns a list of image file extensions supported by the toolkit.
array An array of supported image file extensions (e.g. png/jpeg/gif).
public static function getSupportedExtensions();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!ImageToolkit!ImageToolkitInterface.php/function/ImageToolkitInterface::getSupportedExtensions/8.1.x