mediawiki-extension-IsekaiOffcanvasToc/includes/Hooks.php

<?php
namespace Isekai\OffcanvasToc;

use MediaWiki\MediaWikiServices;

class Hooks {
    public static function onLoad(\OutputPage $outputPage) {
		$service = MediaWikiServices::getInstance();
		if (
            $outputPage->getTitle()->isContentPage() &&
            $service->getUserOptionsLookup()->getOption($outputPage->getUser(), 'offcanvas-toc-enabled')
        ) {
            $outputPage->addModules(['ext.isekai.offcanvas-toc']);
        }
    }

    public static function onGetPreferences(\User $user, array &$preferences) {
        $preferences['offcanvas-toc-enabled'] = [
			'type' => 'toggle',
			'label-message' => 'offcanvas-toc-enabled',
			'section' => 'rendering/offcanvas-toc'
		];

        return true;
    }
}