Register new widgets in functions.php

Hello,

I’m trying to register new Elementor Widget without creating a plugin. So I wish to register it in my functions.php

Regarding to Elementor developper’s guide, I need to use :

function register_new_widgets( $widgets_manager ) {

    require_once( __DIR__ . '/my-elementor-widget.php' );
    $widgets_manager->register( new \widget_class_name() );

}
add_action( 'elementor/widgets/register', 'register_new_widgets' );

Perhaps, I was having a fatal error saying my Class doesn’t exists. After a long search I discover that was because Elementor class hasn’t been loaded yet when registering this new classes and that I need to use Elementor Initialization to get my Widget loaded only when Elementor will load other widgets.

So regarding the second documentationc, I’ve made something similar as :

final class Plugin {

    /**
     * Initialize
     *
     * Load the addons functionality only after Elementor is initialized.
     *
     * Fired by <code>elementor/init</code> action hook.
     *
     * @since 1.0.0
     * @access public
     */
    public function init() {

        add_action( 'elementor/widgets/register', [ $this, 'register_widgets' ] );

    }

    /**
     * Register Widgets
     *
     * Load widgets files and register new Elementor widgets.
     *
     * Fired by <code>elementor/widgets/register</code> action hook.
     *
     * @param \Elementor\Widgets_Manager $widgets_manager Elementor widgets manager.
     */
    public function register_widgets( $widgets_manager ) {

    require_once( __DIR__ . '/my-elementor-widget.php' );
    $widgets_manager->register( new \widget_class_name() );

    }

}

Now I don’t have fatal error anymore, but in my elementor, I still don’t find my widget.

Did I miss something or done something wrong ?