Nette\DI\Compiler::getExtensions PHP Method

    public function getExtensions($type = NULL)
    {
        return $type ? array_filter($this->extensions, function ($item) use($type) {
            return $item instanceof $type;
        }) : $this->extensions;
    }

 public function setCompiler(Nette\DI\Compiler $compiler, $name) : self
 {
     $application = current($compiler->getExtensions(Nette\Bridges\ApplicationDI\ApplicationExtension::class));
     if ($application instanceof Nette\Bridges\ApplicationDI\ApplicationExtension) {
         $application->defaults['errorPresenter'] = FALSE;
         $application->defaults['scanDirs'] = FALSE;
         $application->defaults['mapping'] = ['*' => 'Ytnuk\\*\\*'];
     }
     $session = current($compiler->getExtensions(Nette\Bridges\HttpDI\SessionExtension::class));
     if ($session instanceof Nette\Bridges\HttpDI\SessionExtension) {
         $session->defaults['debugger'] = $this->debugMode;
     }
     $http = current($compiler->getExtensions(Nette\Bridges\HttpDI\HttpExtension::class));
     if ($http instanceof Nette\Bridges\HttpDI\HttpExtension) {
         $http->defaults['headers']['X-Powered-By'] = __NAMESPACE__;
         $contentSecurityPolicy = ['default-src' => '\'self\'', 'form-action' => '\'self\'', 'img-src' => '\'self\' data:'];
         if ($this->debugMode) {
             $contentSecurityPolicy += ['script-src' => '\'self\' \'unsafe-inline\' \'unsafe-eval\'', 'style-src' => '\'self\' \'unsafe-inline\''];
         }
         $http->defaults['headers']['Content-Security-Policy'] = implode(';', array_map(function (string $key, string $value) {
             return implode(' ', [$key, $value]);
         }, array_keys($contentSecurityPolicy), array_values($contentSecurityPolicy)));
     }
     $di = current($compiler->getExtensions(Nette\DI\Extensions\DIExtension::class));
     if ($di instanceof Nette\DI\Extensions\DIExtension) {
         $di->defaults['debugger'] = $this->debugMode;
     }
     return parent::setCompiler($compiler, $name);
 }