code: public function createLoader(array $autoloads)
      {
          $loader = new ClassLoader();
  
          if (isset($autoloads['psr-0'])) {
              foreach ($autoloads['psr-0'] as $namespace => $path) {
                  $loader->add($namespace, $path);
              }
          }
  
          if (isset($autoloads['psr-4'])) {
              foreach ($autoloads['psr-4'] as $namespace => $path) {
                  $loader->addPsr4($namespace, $path);
              }
          }
  
          if (isset($autoloads['classmap'])) {
              $blacklist = null;
              if (!empty($autoloads['exclude-from-classmap'])) {
                  $blacklist = '{(' . implode('|', $autoloads['exclude-from-classmap']) . ')}';
              }
  
              foreach ($autoloads['classmap'] as $dir) {
                  try {
                      $loader->addClassMap($this->generateClassMap($dir, $blacklist, null, false));
                  } catch (\RuntimeException $e) {
                      $this->io->writeError('<warning>'.$e->getMessage().'</warning>');
                  }
              }
          }
  
          return $loader;
      }
docs: Registers an autoloader based on an autoload map returned by parseAutoloads
  
  @param  array       $autoloads see parseAutoloads return value
  @return ClassLoader