TCA::getFileFieldTCAConfig() 

\nn\t3::TCA()->getFileFieldTCAConfig($fieldName = 'media', $override = []); 

Get FAL configuration for the TCA.

Standard config incl. image cropper, link and alternative image title This setting changes regularly, which is quite an imposition given the number of parameters and their changing position in the array is quite an imposition.

https://bit.ly/2SUvASe

\nn\t3::TCA()->getFileFieldTCAConfig('media');
\nn\t3::TCA()->getFileFieldTCAConfig('media', ['maxitems'=>1, 'fileExtensions'=>'jpg']);
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Is used in the TCA like this:

'falprofileimage' => [
    'config' => \nn\t3::TCA()->getFileFieldTCAConfig('falprofileimage', ['maxitems'=>1]),
],
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| @return array

Source Code 

public function getFileFieldTCAConfig( $fieldName = 'media', $override = [] )
{
	// Vereinfachte Übergabe der Optionen
	$options = array_merge([
		'label' => 'LLL:EXT:frontend/Resources/Private/Language/Database.xlf:tt_content.asset_references',
		'maxitems' => 999,
		'fileExtensions' => 'common-media-types',
		// 'fileUploadAllowed' => true,
		// 'fileByUrlAllowed' => true,
	], $override);
	/*
	$config = [
		'label' => $options['label'],
		'appearance' => [
			'fileUploadAllowed' => $options['fileUploadAllowed'],
			'fileByUrlAllowed' => $options['fileByUrlAllowed'],
		],
		'config' => [
			'type' => 'file',
			'maxitems' => $options['maxitems'],
			'allowed' => $options['fileExtensions'],
		]
	];
	*/
	$config = [
		'type' => 'file',
		'maxitems' => $options['maxitems'],
		'allowed' => $options['fileExtensions'],
	];
	if ($childConfig = $options['overrideChildTca'] ?? false) {
		$config['overrideChildTca'] = $childConfig;
	}
	return $config;
}
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