diff --git a/docs/99-dependency-injection.md b/docs/99-dependency-injection.md
index 5e45e98..980bb53 100644
--- a/docs/99-dependency-injection.md
+++ b/docs/99-dependency-injection.md
@@ -10,7 +10,7 @@ use function DI\autowire, DI\create, DI\get;
 use Laminas\Diactoros\Response\HtmlResponse;
 
 use Picea\{ Picea, Caching\Cache, Caching\Opcache, Compiler, Compiler\Context, Compiler\BaseContext, FileFetcher, Language\DefaultRegistrations, Method\Request };
-use Picea\Extension\{ LanguageHandler, LanguageExtension, TitleExtension, NumberExtension, UrlExtension };
+use Picea\Extension\{ LanguageHandlerInterface, LanguageExtension, TitleExtension, NumberExtension, UrlExtension };
 use Picea\Ui\{ Method, Ui };
 
 return [
@@ -49,10 +49,10 @@ return [
 
     Method\Pagination::class => autowire(Method\Pagination::class),
 
-    LanguageExtension::class => create(LanguageExtension::class)->constructor(get(LanguageHandler::class)),
+    LanguageExtension::class => create(LanguageExtension::class)->constructor(get(LanguageHandlerInterface::class)),
 
-    LanguageHandler::class => function($c) {
-        return new class( $c->get(Tell\I18n::class) ) implements LanguageHandler {
+    LanguageHandlerInterface::class => function($c) {
+        return new class( $c->get(Tell\I18n::class) ) implements LanguageHandlerInterface {
             public Tell\I18n $tell;
 
             public function __construct(Tell\I18n $tell) {
diff --git a/src/Compiler.php b/src/Compiler.php
index 788873e..3edb082 100644
--- a/src/Compiler.php
+++ b/src/Compiler.php
@@ -25,11 +25,10 @@ class Compiler
 
     public array $extensionList = [];
 
-    public ? LanguageRegistration $languageRegistration;
-
-    public function __construct(?LanguageRegistration $languageRegistration = null)
+    public function __construct(
+        public LanguageRegistration $languageRegistration
+    )
     {
-        $this->languageRegistration = $languageRegistration;
         $this->languageRegistration->registerAll($this);
     }
 
@@ -158,7 +157,7 @@ class Compiler
 
         return $this->extensionList[$tokenName];
     }
-    
+
     public function exportFunctions() : void
     {
         static $caching = [];
diff --git a/src/Extension/LanguageExtension.php b/src/Extension/LanguageExtension.php
index a821e85..3df7c7b 100644
--- a/src/Extension/LanguageExtension.php
+++ b/src/Extension/LanguageExtension.php
@@ -11,9 +11,9 @@ class LanguageExtension implements Extension, FunctionExtension {
 
     public string $currentLanguage = "";
 
-    protected LanguageHandler $languageHandler;
+    protected LanguageHandlerInterface $languageHandler;
 
-    public function __construct(LanguageHandler $handler) {
+    public function __construct(LanguageHandlerInterface $handler) {
         $this->languageHandler = $handler;
     }
 
diff --git a/src/Extension/LanguageHandler.php b/src/Extension/LanguageHandlerInterface.php
similarity index 78%
rename from src/Extension/LanguageHandler.php
rename to src/Extension/LanguageHandlerInterface.php
index 281e6aa..85af89d 100644
--- a/src/Extension/LanguageHandler.php
+++ b/src/Extension/LanguageHandlerInterface.php
@@ -2,7 +2,7 @@
 
 namespace Picea\Extension;
 
-interface LanguageHandler
+interface LanguageHandlerInterface
 {
     public function languageFromKey(string $key, array $variables = []); #: array|string;
 }
diff --git a/src/Extension/UrlExtension.php b/src/Extension/UrlExtension.php
index 974a329..95d4920 100644
--- a/src/Extension/UrlExtension.php
+++ b/src/Extension/UrlExtension.php
@@ -43,13 +43,6 @@ PATTERN;
         $this->assetToken = $assetToken;
         $this->appUrl = $appUrl;
         $this->forceSSL = $forceSSL;
-
-        $this->eventRegister(new class() implements BuildAssetUrl {
-            public function execute(string $uri, array $parameters = [], bool $appendVersion = true) : mixed
-            {
-
-            }
-        });
    }
 
     public function parse(\Picea\Compiler\Context &$context, ?string $arguments, string $token, array $options = []) : string
diff --git a/src/Language/DefaultRegistrations.php b/src/Language/DefaultRegistrations.php
index 72d40f0..d694e29 100644
--- a/src/Language/DefaultRegistrations.php
+++ b/src/Language/DefaultRegistrations.php
@@ -6,18 +6,11 @@ use Picea\Compiler;
 
 class DefaultRegistrations implements LanguageRegistration
 {
-    protected array $extensions;
-    
-    protected array $syntaxes;
-    
-    protected array $controlStructures;
-
-    public function __construct(array $extensions = [], array $syntaxes = [], array $controlStructure = [])
-    {
-        $this->extensions = $extensions;
-        $this->syntaxes = $syntaxes;
-        $this->controlStructures = $controlStructure;
-    }
+    public function __construct(
+        protected array $extensions,
+        protected array $syntaxes,
+        protected array $controlStructures,
+    ) { }
     
     public function registerAll(Compiler $compiler) : void
     {
diff --git a/src/Picea.php b/src/Picea.php
index eb1f600..4528d96 100644
--- a/src/Picea.php
+++ b/src/Picea.php
@@ -43,7 +43,7 @@ class Picea implements LanguageRegistration
     ){
         $this->cache = $cache ?? new Caching\Memory("");
         $this->context = $context ?? new Compiler\BaseContext();
-        $this->languageRegistration = $languageRegistration ?? new Language\DefaultRegistrations();
+        $this->languageRegistration = $languageRegistration ?? new Language\DefaultRegistrations([], [], []);
         $this->builderTemplatePath = $builderTemplatePath ?? dirname(__FILE__) . static::DEFAULT_BUILDER_TEMPLATE;
         $this->compiler = $compiler ?? $this->instanciateCompiler();
         $this->fileFetcher = $fileFetcher ?? $this->instanciateFileFetcher();