crop-monitor/core/components/collections/elements/plugins/collections.plugin.php

<?php
/**
 * Collections
 *
 * DESCRIPTION
 *
 * This plugin inject JS to handle proper working of close buttons in Resource's panel (OnDocFormPrerender)
 * This plugin handles setting proper show_in_tree parameter (OnBeforeDocFormSave, OnResourceSort)
 *
 * @var modX $modx
 * @var array $scriptProperties
 */
$corePath = $modx->getOption('collections.core_path', null, $modx->getOption('core_path', null, MODX_CORE_PATH) . 'components/collections/');
/** @var Collections $collections */
$collections = $modx->getService(
    'collections',
    'Collections',
    $corePath . 'model/collections/',
    array(
        'core_path' => $corePath
    )
);

if (!($collections instanceof Collections)) return '';

$className = "\\Collections\\Events\\{$modx->event->name}";
if (class_exists($className)) {
    /** @var \Collections\Events\Event $handler */
    $handler = new $className($modx, $scriptProperties);
    $handler->run();
}

return;