Allow @var mixed annotations (#30)

Author: MidnightDesign

php-cs-fixer-rules.php

@@ -48,7 +48,10 @@
     ],
     'no_multiline_whitespace_around_double_arrow' => true,
     'no_superfluous_elseif' => true,
-    'no_superfluous_phpdoc_tags' => true,
+    'no_superfluous_phpdoc_tags' => [
+        // Psalm wants us to have an explicit type annotation whenever we assign `mixed` to a variable.
+        'allow_mixed' => true,
+    ],
     'no_trailing_comma_in_singleline' => true,
     'no_unused_imports' => true,
     'no_useless_else' => true,

tests/fixtures/valid/mixed-assignment.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @param array<string, mixed> $struct
+ */
+function getFoo(array $struct): void
+{
+    /** @var mixed $foo */
+    $foo = $struct['foo'];
+    echo $foo;
+}