Return null if no locale was detected

Author: ivanvermeyen

src/Middleware/LocaleHandler.php

@@ -53,9 +53,9 @@ public function __construct($locales, $detectors, $stores = [], $trustedDetector
     /**
      * Detect any supported locale and return the first match.
      *
-     * @return string|false
+     * @return string|null
      */
-    public function detect()
+    public function detect(): ?string
     {
         foreach ($this->detectors as $detector) {
             $locales = (array) $this->getInstance($detector)->detect();
@@ -67,7 +67,7 @@ public function detect()
             }
         }
 
-        return false;
+        return null;
     }
 
     /**

tests/Unit/Middleware/LocaleHandlerTest.php

@@ -110,7 +110,7 @@ public function it_returns_false_if_no_supported_locale_could_be_detected()
 
         $localeHandler = new LocaleHandler($supportedLocales, $detectors);
 
-        $this->assertFalse($localeHandler->detect());
+        $this->assertNull($localeHandler->detect());
     }
 
     /** @test */