calendar/ext_emconf.php

<?php

$EM_CONF['calendar'] = [
    'title' => 'Calendar',
    'description' => 'API for extensions to create calendar',
    'category' => 'misc',
    'author' => 'Daniel Siepmann',
    'author_email' => 'coding@daniel-siepmann.de',
    'author_company' => 'Codappix GmbH',
    'state' => 'alpha',
    'uploadfolder' => 0,
    'clearCacheOnLoad' => 0,
    'version' => '2.1.0',
    'constraints' => [
        'depends' => [
            'typo3' => '*',
        ],
        'conflicts' => [],
        'suggests' => [],
    ],
];