[TypeDeclarationDocblocks] Skip mixed[] and mixed|null on DocblockGetterReturnArrayFromPropertyDocblockVarRector (#7261)

Author: samsonasik

rules-tests/TypeDeclarationDocblocks/Rector/ClassMethod/DocblockGetterReturnArrayFromPropertyDocblockVarRector/Fixture/skip_mixed_array.php.inc

@@ -0,0 +1,13 @@
+<?php
+
+namespace Rector\Tests\TypeDeclarationDocblocks\Rector\ClassMethod\DocblockGetterReturnArrayFromPropertyDocblockVarRector\Fixture;
+
+final class SkipMixedArray
+{
+    private array $names = [];
+
+    public function getNames(): array
+    {
+        return $this->names;
+    }
+}

rules-tests/TypeDeclarationDocblocks/Rector/ClassMethod/DocblockGetterReturnArrayFromPropertyDocblockVarRector/Fixture/skip_nullable_mixed_array.php.inc

@@ -0,0 +1,13 @@
+<?php
+
+namespace Rector\Tests\TypeDeclarationDocblocks\Rector\ClassMethod\DocblockGetterReturnArrayFromPropertyDocblockVarRector\Fixture;
+
+final class SkipNullableMixedArray
+{
+    private ?array $names = [];
+
+    public function getNames(): array
+    {
+        return $this->names;
+    }
+}

rules/TypeDeclarationDocblocks/Rector/ClassMethod/DocblockGetterReturnArrayFromPropertyDocblockVarRector.php

@@ -9,6 +9,9 @@
 use PhpParser\Node\Stmt\ClassMethod;
 use PhpParser\Node\Stmt\Return_;
 use PHPStan\PhpDocParser\Ast\PhpDoc\ReturnTagValueNode;
+use PHPStan\Type\ArrayType;
+use PHPStan\Type\MixedType;
+use PHPStan\Type\UnionType;
 use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfoFactory;
 use Rector\Comments\NodeDocBlock\DocBlockUpdater;
 use Rector\Rector\AbstractRector;
@@ -99,6 +102,17 @@ public function refactor(Node $node): ?Node
         }
 
         $propertyFetchType = $this->getType($propertyFetch);
+        if ($propertyFetchType instanceof ArrayType
+            && $propertyFetchType->getKeyType() instanceof MixedType
+            && $propertyFetchType->getItemType() instanceof MixedType
+        ) {
+            return null;
+        }
+
+        if ($propertyFetchType instanceof UnionType) {
+            return null;
+        }
+
         $propertyFetchDocTypeNode = $this->staticTypeMapper->mapPHPStanTypeToPHPStanPhpDocTypeNode($propertyFetchType);
 
         $returnTagValueNode = new ReturnTagValueNode($propertyFetchDocTypeNode, '');