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Extending Volt's filters (custom filters)

There is a way to create custom filters in Volt. But where the code goes exactly? Into the config file (index.php)?

Sample code:

$compiler = $volt->getCompiler();

$compiler->addFilter('isArray', function($resolvedArgs) {
    return 'is_array('.$resolvedArgs.')';


That must be added to the Volt's service registration, for example: