Gist for my tutorial "Building a Gutenberg sidebar plugin Part 1: Registering the plugin with (oop) php". https://vanaf1979.nl/making-a-gutenberg-sidebar-plugin-part-1-registering-the-plugin-with-oop-php/

meatatags-class-adding-properties.php

<?php
class MetaTags {

    private static $instance;

    private static $pluginslug = 'metatags';

    private $metafields = array(
        'title' => 'metatags_browser_title',
        'description' => 'metatags_description_field',
        'robots' => 'metatags_robots_field'
    );

    private $dependencies = array(
        'wp-plugins',
        'wp-edit-post',
        'wp-element',
        'wp-components',
        'wp-data',
        'wp-dom-ready'
    );

}
?>