Add types

Author: BenMorel

src/Formatter/GBFormatter.php

@@ -51,7 +51,7 @@ class GBFormatter implements CountryPostcodeFormatter
      *
      * @var string[]|null
      */
-    private $patterns = null;
+    private ?array $patterns = null;
 
     public function format(string $postcode) : ?string
     {

src/PostcodeFormatter.php

@@ -12,7 +12,7 @@ class PostcodeFormatter
     /**
      * The country postcode formatters, indexed by country code.
      *
-     * @var (CountryPostcodeFormatter|null)[]
+     * @var array<string, CountryPostcodeFormatter|null>
      */
     private array $formatters = [];