oficial/app/setup/app.php

<?php
use DI\ContainerBuilder;
use DI\Bridge\Slim\Bridge;

require_once 'composer.php';

function buildApp() {
    require_once 'container.php';
    $app = Bridge::create(buildContainer());
    $folder = implode(DIRECTORY_SEPARATOR, [
        __DIR__,
        'middlewares'
    ]);
    if (file_exists($folder)) {
        $files = new FilesystemIterator($folder);
        foreach ($files as $file) {
            if ($file->isDir()) {
                continue;
            }
            require_once $file->getRealPath();
        }
    }
    return $app;
}
return buildApp();