diff --git a/packages/better-php-doc-parser/src/Type/PreSlashStringType.php b/packages/better-php-doc-parser/src/Type/PreSlashStringType.php
deleted file mode 100644
index c69ff7e4600..00000000000
--- a/packages/better-php-doc-parser/src/Type/PreSlashStringType.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Rector\BetterPhpDocParser\Type;
-
-use PHPStan\Type\StringType;
-use PHPStan\Type\VerbosityLevel;
-
-final class PreSlashStringType extends StringType
-{
-    public function describe(VerbosityLevel $verbosityLevel): string
-    {
-        return '\string';
-    }
-}
diff --git a/packages/node-type-resolver/src/NodeTypeResolver/ParamTypeResolver.php b/packages/node-type-resolver/src/NodeTypeResolver/ParamTypeResolver.php
index 0cf1fbb7a24..3d61ae91889 100644
--- a/packages/node-type-resolver/src/NodeTypeResolver/ParamTypeResolver.php
+++ b/packages/node-type-resolver/src/NodeTypeResolver/ParamTypeResolver.php
@@ -80,7 +80,7 @@ final class ParamTypeResolver implements NodeTypeResolverInterface
         return $this->resolveFromFunctionDocBlock($node);
     }
 
-    private function resolveFromType(Node $node)
+    private function resolveFromType(Node $node): Type
     {
         if ($node->type !== null && ! $node->type instanceof Identifier) {
             $resolveTypeName = $this->nodeNameResolver->getName($node->type);
diff --git a/packages/static-type-mapper/src/PhpDocParser/ArrayTypeMapper.php b/packages/static-type-mapper/src/PhpDocParser/ArrayTypeMapper.php
index 1229791ef20..9b33550499f 100644
--- a/packages/static-type-mapper/src/PhpDocParser/ArrayTypeMapper.php
+++ b/packages/static-type-mapper/src/PhpDocParser/ArrayTypeMapper.php
@@ -41,7 +41,6 @@ final class ArrayTypeMapper implements PhpDocTypeMapperInterface
     {
         $nestedType = $this->phpDocTypeMapper->mapToPHPStanType($typeNode->type, $node, $nameScope);
 
-        // @todo improve for key!
         return new ArrayType(new MixedType(), $nestedType);
     }
 }
diff --git a/packages/static-type-mapper/src/PhpDocParser/IdentifierTypeMapper.php b/packages/static-type-mapper/src/PhpDocParser/IdentifierTypeMapper.php
index 31a14ee1759..bb4d8bf8dc4 100644
--- a/packages/static-type-mapper/src/PhpDocParser/IdentifierTypeMapper.php
+++ b/packages/static-type-mapper/src/PhpDocParser/IdentifierTypeMapper.php
@@ -16,6 +16,7 @@ use PHPStan\Type\StaticType;
 use PHPStan\Type\Type;
 use Rector\AttributeAwarePhpDoc\Ast\Type\AttributeAwareIdentifierTypeNode;
 use Rector\BetterPhpDocParser\Type\PreSlashStringType;
+use Rector\Core\Exception\ShouldNotHappenException;
 use Rector\NodeTypeResolver\Node\AttributeKey;
 use Rector\PHPStan\Type\ParentStaticType;
 use Rector\PHPStan\Type\SelfObjectType;
@@ -60,11 +61,6 @@ final class IdentifierTypeMapper implements PhpDocTypeMapperInterface
 
         $loweredName = strtolower($typeNode->name);
 
-        // @todo for all scalars
-        if ($loweredName === '\string') {
-            return new PreSlashStringType();
-        }
-
         if ($loweredName === 'class-string') {
             return new ClassStringType();
         }
diff --git a/utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/CorrectSeeRectorTest.php b/utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/CorrectSeeRector.php
similarity index 73%
rename from utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/CorrectSeeRectorTest.php
rename to utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/CorrectSeeRector.php
index b7abd0cdd24..33f9acdb140 100644
--- a/utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/CorrectSeeRectorTest.php
+++ b/utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/CorrectSeeRector.php
@@ -6,6 +6,6 @@ namespace Rector\PHPStanExtensions\Tests\Rule\SeeAnnotationToTestRule;
 
 use PHPUnit\Framework\TestCase;
 
-final class CorrectSeeRectorTest extends TestCase
+final class CorrectSeeRector extends TestCase
 {
 }
diff --git a/utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/Fixture/CorrectSeeRector.php b/utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/Fixture/CorrectSeeRector.php
index 26849a5eae6..9f2e2c426ef 100644
--- a/utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/Fixture/CorrectSeeRector.php
+++ b/utils/phpstan-extensions/tests/Rule/SeeAnnotationToTestRule/Fixture/CorrectSeeRector.php
@@ -10,7 +10,7 @@ use Rector\Core\Rector\AbstractRector;
 use Rector\Core\RectorDefinition\RectorDefinition;
 
 /**
- * @see \Rector\PHPStanExtensions\Tests\Rule\SeeAnnotationToTestRule\CorrectSeeRectorTest
+ * @see \Rector\PHPStanExtensions\Tests\Rule\SeeAnnotationToTestRule\CorrectSeeRector
  */
 final class CorrectSeeRector extends AbstractRector implements PhpRectorInterface
 {