diff --git a/README.md b/README.md
index d791cb3..ed10d6a 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,6 @@ $ composer require jvitasek/dumpanddie
 <?php declare(strict_types = 1);
 
 use Nette\Application\UI\Presenter;
-use JVitasek\DumpAndDie\Dumper;
 
 final class TestPresenter extends Presenter {
 
@@ -23,7 +22,7 @@ final class TestPresenter extends Presenter {
         $filename = sha1($price + time()) . '.log';
         
         // write this
-        Dumper::dd($price, $filename);
+        dd($price, $filename);
         
         // instead of this
         \Tracy\Debugger::barDump($price);
diff --git a/composer.json b/composer.json
index dd993c8..f926c38 100644
--- a/composer.json
+++ b/composer.json
@@ -20,8 +20,11 @@
     "tracy/tracy": "^2.8"
   },
   "autoload": {
-    "psr-4": {
-      "JVitasek\\DumpAndDie\\": "src"
-    }
+    "files": ["src/dumper.php"]
+  },
+  "require-dev": {
+    "phpstan/phpstan-nette": "^0.12.16",
+    "phpstan/extension-installer": "^1.1",
+    "slevomat/coding-standard": "^6.4"
   }
-}
\ No newline at end of file
+}
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..26e005b
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,4 @@
+parameters:
+    paths:
+        - src
+    level: 6
\ No newline at end of file
diff --git a/ruleset.xml b/ruleset.xml
new file mode 100644
index 0000000..552d720
--- /dev/null
+++ b/ruleset.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0"?>
+<ruleset name="AcmeProject">
+    <rule ref="vendor/slevomat/coding-standard/SlevomatCodingStandard/ruleset.xml"><!-- relative path to your ruleset.xml -->
+        <!-- sniffs to exclude -->
+    </rule>
+</ruleset>
\ No newline at end of file
diff --git a/src/Dumper.php b/src/Dumper.php
deleted file mode 100644
index bae773b..0000000
--- a/src/Dumper.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace JVitasek\DumpAndDie;
-
-use Tracy\Debugger;
-
-final class Dumper {
-
-    public static function dd(...$args) {
-        foreach ($args as $x) {
-            Debugger::barDump($x);
-        }
-        die(1);
-    }
-
-}
\ No newline at end of file
diff --git a/src/dumper.php b/src/dumper.php
new file mode 100644
index 0000000..135ac24
--- /dev/null
+++ b/src/dumper.php
@@ -0,0 +1,14 @@
+<?php declare(strict_types = 1);
+
+use Tracy\Debugger;
+
+if (!function_exists('dd')) {
+	function dd(...$args): void
+	{
+		foreach ($args as $x) {
+			Debugger::barDump($x);
+		}
+
+		die(1);
+	}
+}
\ No newline at end of file
diff --git a/tests/index.php b/tests/index.php
index 49742bd..f469716 100644
--- a/tests/index.php
+++ b/tests/index.php
@@ -1,8 +1,7 @@
 <?php
 
-use JVitasek\DumpAndDie\Dumper;
 use Tracy\Debugger;
 
 require __DIR__ . '/../vendor/autoload.php';
 Debugger::enable(Debugger::DEVELOPMENT);
-Dumper::dd('dump working');
\ No newline at end of file
+dd('dump working');
\ No newline at end of file