public function __construct($externalSheet, $worksheetFilesFolder)
{
$this->externalSheet = $externalSheet;
/** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
$this->stringsEscaper = \Box\Spout\Common\Escaper\ODS::getInstance();
$this->worksheetFilePath = $worksheetFilesFolder . '/sheet' . $externalSheet->getIndex() . '.xml';
$this->stringHelper = new StringHelper();
$this->startSheet();
}