diff --git a/src/Writer/ConsoleWriter.php b/src/Writer/ConsoleWriter.php
index 9c1d05c..2de667e 100644
--- a/src/Writer/ConsoleWriter.php
+++ b/src/Writer/ConsoleWriter.php
@@ -16,7 +16,7 @@
 class ConsoleWriter implements WriterInterface
 {
 
-    protected $darkmode;
+    protected bool $darkmode;
 
     /**
      * Ctor
diff --git a/src/Writer/Result/ConsoleResult.php b/src/Writer/Result/ConsoleResult.php
index 1a98ee8..a4c9575 100644
--- a/src/Writer/Result/ConsoleResult.php
+++ b/src/Writer/Result/ConsoleResult.php
@@ -18,8 +18,8 @@ class ConsoleResult extends AbstractResult
         3 => ' '
     ];
 
-    protected $matrix;
-    protected $twoblocks;
+    protected MatrixInterface $matrix;
+    protected array $twoblocks;
 
     /**
      * @param MatrixInterface $matrix
@@ -58,7 +58,7 @@ public function getString(): string
 
         echo str_repeat($this->twoblocks[0], $side + 4) . PHP_EOL; // margin-bottom
 
-        return ob_get_clean();
+        return (string) ob_get_clean();
     }
 
 }