ItemDataProvider::getFieldNamesByType

public function getFieldNamesByType(string $type, string $whereToDisplay = self::DISPLAY_ANYWHERE): array
{
	$fields = $this->getFieldsToDisplay($whereToDisplay);

	$separated = [];
	foreach ($fields as $fieldName => $fieldParams)
	{
		if (!empty($fieldParams['type']) && $fieldParams['type'] === $type)
		{
			$separated[] = $fieldName;
		}
	}

	return $separated;
}