Собственные модификаторы Fenom

Лично я уже полностью перешел на файлы, и создавать запись в БД для сниппета, только ради его связи с файлом мне совсем не хочется

<?php
/** @var modx $modx */
switch ($modx->event->name) {
    case 'pdoToolsOnFenomInit':
        /** @var Fenom $fenom */
        $fenom->addModifier('ch1Count', function ($input) {
            /** @var modx $modx */
            $ids = $modx->getChildIds($input);
            return count($ids);
        });

        $fenom->addModifier('ch2Count', function ($input) {
            /** @var modx $modx */
            $modx = $this->modx;
            $ids = $modx->getChildIds($input);
            return count($ids);
        });

        $fenom->addModifier('mTest', function ($input, $props) {
            return serialize($props);
        });

        break;
}

<?php
 /** @var modx $modx */
$ids = $modx->getChildIds($input);
return count($ids);

<?php
$str = $input;
echo mb_lcfirst($str); // какой-То Текст

function mb_lcfirst($str) {
    return mb_strtolower(mb_substr($str, 0, 1)) . mb_substr($str, 1);
}

{$variable | lcfirst}

tack trace:
#0 /home/mh/mh/www/core/components/pdotools/model/pdotools/pdotools.class.php(552) : eval()'d code(11): modScript->{closure}('size')
#1 /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Render.php(215): pdoTools->{closure}(Array, Object(Fenom\Render))
#2 /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Render.php(215): Closure->__invoke(Array, Object(Fenom\Render))
#3 /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Render.php(229): Fenom\Render->display(Array)
#4 /home/mh/mh/www/core/components/pdotools/model/pdotools/pdotools.class.php(580): Fenom\Render->fetch(Array)
#5 /home/mh/mh/www/core/components/pdotools/model/pdotools/pdopar in /home/mh/mh/www/core/cache/includes/elements/modplugin/32.include.cache.php on line 48
[11-Mar-2020 12:17:24 Europe/Moscow] PHP Fatal error:  Uncaught ArgumentCountError: Too few arguments to function modScript::{closure}(), 1 passed in /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Template.php(487) : eval()'d code on line 360 and exactly 2 expected in /home/mh/mh/www/core/cache/includes/elements/modplugin/37.include.cache.php:5
Stack trace:
#0 /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Template.php(487) : eval()'d code(360): modScript->{closure}(Array)
#1 /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Render.php(215): Fenom\Template->{closure}(Array, Object(Fenom\Template))
#2 /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Render.php(215): Closure->__invoke(Array, Object(Fenom\Template))
#3 /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Template.php(492): Fenom\Render->display(Array)
#4 /home/mh/mh/www/core/components/pdotools/vendor/fenom/fenom/src/Fenom/Template.php(487) : eval()'d code(7): Fenom\Template->display(Array)
#5 /ho in /home/mh/mh/www/core/cache/includes/elements/modplugin/37.include.cache.php on line 5

$fenom->addBlockFunction('deflate', function (array $params, $content) use ($modx) {
    $filters = [
      '/<!--([\s\S]*?)-->/'                                               => '', // Remove HTML Comments (breaks with HTML5 Boilerplate)
      '/(?<!\S)\/\/\s*[^\r\n]*/'                                          => '', // Remove comments in the form /* */
      '/\>[^\S ]+/s'                                                      => '>',
      '/[^\S ]+\</s'                                                      => '<',
      '/([\t ])+/s'                                                       => ' ',
      '/^([\t ])+/m'                                                      => '',
      '/([\t ])+$/m'                                                      => '',
      '~//[a-zA-Z0-9 ]+$~m'                                               => '',
      '/[\r\n]+([\t ]?[\r\n]+)+/s'                                        => "\n",
      '/\>[\r\n\t ]+\</s'                                                 => '><',
      '/}[\r\n\t ]+/s'                                                    => '}',
      '/}[\r\n\t ]+,[\r\n\t ]+/s'                                         => '},',
      '/\)[\r\n\t ]?{[\r\n\t ]+/s'                                        => '){',
      '/,[\r\n\t ]?{[\r\n\t ]+/s'                                         => ',{',
      '/\),[\r\n\t ]+/s'                                                  => '),',
      '/<!--(.*)-->/isU'                                                  => '',
      '/\r/'                                                              => '', 
      '/\n/'                                                              => '', 
      '/\>\s+/'                                                           => '>', 
      '~([\r\n\t ])?([a-zA-Z0-9]+)=\"([a-zA-Z0-9_\\-]+)\"([\r\n\t ])?~s'  => '$1$2=$3$4', 
    ];
    $content = preg_replace(array_keys($filters), array_values($filters), $content);
    return $content;
});

{if $key | notin : $array} {* не выбивает синтаксическую ошибку, но не работает*} 
{if $key | not in : $array} {* выбивает синтаксическую ошибку*}

{if $key | in : $array}{else}выполняем{/if} {*ну такое*}