Core/Autoloader/BundlesAutoloader.php
protected function install()
    {
        foreach ($this->autoloaderCollection as $dir => $jsonAutoloader) {
            $bundleName = $jsonAutoloader->getBundleName();
            $this->installPackage($dir, $jsonAutoloader);
            unset($this->installedBundles[$bundleName]);
        }
    }
protected function install()
    {
        foreach ($this->autoloaderCollection as $dir => $jsonAutoloader) {
            $bundleName = $jsonAutoloader->getBundleName();
            $this->installPackage($dir, $jsonAutoloader);
            unset($this->installedBundles[$bundleName]);
        }
    }
Instantiates the bundles that must be autoconfigured, parsing the autoload_namespaces.php file
generated by composer