Tsfe::cObj() 

\nn\t3::Tsfe()->cObj($request = NULL); 

Get $GLOBALS['TSFE']->cObj.

// since TYPO3 12.4 within a controller:
\nn\t3::Tsfe()->cObj( $this->request )
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| @return \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer

Source Code 

public function cObj( $request = null )
{
	$request = $request ?: \nn\t3::Environment()->getSyntheticFrontendRequest();
	if ($request) {
		if ($cObj = $request->getAttribute('currentContentObject')) {
			return $cObj;
		}
	}
	$cObjRenderer = \nn\t3::injectClass(ContentObjectRenderer::class);
	$cObjRenderer->setRequest( $request );
	return $cObjRenderer;
}
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