firefly-iii/app/View/Components/Layout/Sidebar.php

<?php

namespace FireflyIII\View\Components\Layout;

use Closure;
use Illuminate\Contracts\View\View;
use Illuminate\View\Component;

class Sidebar extends Component
{
    /**
     * Create a new component instance.
     */
    public function __construct()
    {
        //
    }

    /**
     * Get the view / contents that represent the component.
     */
    public function render(): View|Closure|string
    {
        return view('components.layout.sidebar');
    }
}