Tsfe::bootstrap() 

\nn\t3::Tsfe()->bootstrap($conf = []); 

Bootstrap Typo3

\nn\t3::Tsfe()->bootstrap();
\nn\t3::Tsfe()->bootstrap( ['vendorName'=>'Nng', 'extensionName'=>'Nnhelpers', 'pluginName'=>'Foo'] );
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Source Code 

public function bootstrap ( $conf = [] )
{
	$bootstrap = new \TYPO3\CMS\Extbase\Core\Bootstrap();
	if (!$conf) {
		$conf = [
			'vendorName'	=> 'Nng',
			'extensionName'	=> 'Nnhelpers',
			'pluginName'	=> 'Foo',
		];
	}
	$bootstrap->initialize($conf);
}
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