TCA::getSlugTCAConfig() 

\nn\t3::TCA()->getSlugTCAConfig($fields = []); 

Get default slug configuration for the TCA.

'config' => \nn\t3::TCA()->getSlugTCAConfig( 'title' )
'config' => \nn\t3::TCA()->getSlugTCAConfig( ['title', 'header'] )
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@param array|string $fields
@return array

Source Code 

public function getSlugTCAConfig( $fields = [] )
{
	if (is_string($fields)) {
		$fields = [$fields];
	}
	return [
		'type' => 'slug',
		'size' => 50,
		'generatorOptions' => [
			'fields' => $fields,
			'replacements' => [
				'/' => '-'
			],
		],
		'fallbackCharacter' => '-',
		'eval' => 'unique',
		'default' => ''
	];
}
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