Fix false missing arg type declaration for by-reference param

Fixes #17

Author: gmazzap

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## NOT RELEASED
+- Fixed false positive "missing argument type declaration" when param are passed by-reference.
+
 ## 0.13.2 
 - Changed "squizlabs/php_codesniffer" in composer.json to "~3.2.3"
 

Inpsyde/Sniffs/CodeQuality/ArgumentTypeDeclarationSniff.php

@@ -70,7 +70,7 @@ public function process(File $file, $position)
 
         foreach (array_keys($variables) as $varPosition) {
             $typePosition = $file->findPrevious(
-                [T_WHITESPACE, T_ELLIPSIS],
+                [T_WHITESPACE, T_ELLIPSIS, T_BITWISE_AND],
                 $varPosition - 1,
                 $paramsStart + 1,
                 true

tests/fixtures/argument-type-declaration.php

@@ -1,6 +1,10 @@
 <?php
 // @phpcsSniff CodeQuality.ArgumentTypeDeclaration
 
+array_walk($slugs, function (string &$slug) {
+    $slug = sanitize_key($slug);
+});
+
 // @phpcsWarningOnNextLine
 function a($foo)
 {