Registry::configurePlugin() 

\nn\t3::Registry()->configurePlugin($vendorName = '', $pluginName = '', $cacheableActions = [], $uncacheableActions = []); 

Configure a plugin. Use in ext_localconf.php.

\nn\t3::Registry()->configurePlugin( 'Nng\Nncalendar', 'Nncalendar',
    [\Nng\ExtName\Controller\MainController::class => 'index,list'],
    [\Nng\ExtName\Controller\MainController::class => 'show']
);
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| @return void

Source Code 

public function configurePlugin ( $vendorName = '', $pluginName = '', $cacheableActions = [], $uncacheableActions = [] )
{
	$registrationName = $this->getVendorExtensionName($vendorName);
	$pluginName = GeneralUtility::underscoredToUpperCamelCase( $pluginName );
	\TYPO3\CMS\Extbase\Utility\ExtensionUtility::configurePlugin(
		$registrationName, $pluginName,
		$this->parseControllerActions($cacheableActions),
		$this->parseControllerActions($uncacheableActions)
	);
}
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