PHP7 NullObject

Behavioral/NullObject/LoggerInterface.php

@@ -3,16 +3,9 @@
 namespace DesignPatterns\Behavioral\NullObject;
 
 /**
- * LoggerInterface is a contract for logging something.
- *
- * Key feature: NullLogger MUST inherit from this interface like any other Loggers
+ * Key feature: NullLogger must inherit from this interface like any other loggers
  */
 interface LoggerInterface
 {
-    /**
-     * @param string $str
-     *
-     * @return mixed
-     */
-    public function log($str);
+    public function log(string $str);
 }