Only works when installed alongside the Drupal project about phpstan-drupal HOT 4 CLOSED

        $autoload_file = $GLOBALS['composerAutoloadFile'];
        /** @noinspection PhpIncludeInspection */
        $this->autoloader = require $autoload_file;
        if (!$this->autoloader instanceof ClassLoader) {
            throw new \InvalidArgumentException('Unable to determine the Composer class loader for Drupal');
        }

$autoloaderInWorkingDirectory = getcwd() . '/vendor/autoload.php';
if (is_file($autoloaderInWorkingDirectory)) {
	require_once $autoloaderInWorkingDirectory;
}

$composerAutoloadFile = __DIR__ . '/../vendor/autoload.php';
if (!is_file($composerAutoloadFile)) {
	$composerAutoloadFile = __DIR__ . '/../../../autoload.php';
}

require_once $composerAutoloadFile;

$autoload_file = $GLOBALS['autoloaderInWorkingDirectory'];