Add default types to method tag arguments

src/DocBlock/Tags/Factory/MethodFactory.php

@@ -10,6 +10,7 @@ use phpDocumentor\Reflection\DocBlock\Tags\Method;
 use phpDocumentor\Reflection\DocBlock\Tags\MethodParameter;
 use phpDocumentor\Reflection\Type;
 use phpDocumentor\Reflection\Types\Context;
+use phpDocumentor\Reflection\Types\Mixed_;
 use phpDocumentor\Reflection\Types\Void_;
 use PHPStan\PhpDocParser\Ast\PhpDoc\MethodTagValueNode;
 use PHPStan\PhpDocParser\Ast\PhpDoc\MethodTagValueParameterNode;
@@ -49,7 +50,7 @@ final class MethodFactory implements PHPStanFactory
                 function (MethodTagValueParameterNode $param) use ($context) {
                     return new MethodParameter(
                         trim($param->parameterName, '$'),
-                        $this->typeFactory->createType($param->type, $context),
+                        $this->typeFactory->createType($param->type, $context) ?? new Mixed_(),
                         $param->isReference,
                         $param->isVariadic,
                         (string) $param->defaultValue

src/DocBlock/Tags/Method.php

@@ -328,6 +328,7 @@ final class Method extends BaseTag implements Factory\StaticMethod
 
     /**
      * @param array{name: string, type: Type} $arguments
+     *
      * @return MethodParameter[]
      */
     private function fromLegacyArguments(array $arguments): array

tests/unit/DocBlock/Tags/Factory/MethodFactoryTest.php

@@ -18,6 +18,7 @@ use phpDocumentor\Reflection\DocBlock\Tags\Method;
 use phpDocumentor\Reflection\DocBlock\Tags\MethodParameter;
 use phpDocumentor\Reflection\Types\Context;
 use phpDocumentor\Reflection\Types\Integer;
+use phpDocumentor\Reflection\Types\Mixed_;
 use phpDocumentor\Reflection\Types\String_;
 use phpDocumentor\Reflection\Types\Void_;
 
@@ -82,6 +83,30 @@ final class MethodFactoryTest extends TagFactoryTestCase
                     []
                 ),
             ],
+            [
+                '@method myMethod($a)',
+                new Method(
+                    'myMethod',
+                    [],
+                    new Void_(),
+                    false,
+                    new Description(''),
+                    false,
+                    [new MethodParameter('a', new Mixed_())]
+                ),
+            ],
+            [
+                '@method myMethod($a = 1)',
+                new Method(
+                    'myMethod',
+                    [],
+                    new Void_(),
+                    false,
+                    new Description(''),
+                    false,
+                    [new MethodParameter('a', new Mixed_(), false, false, '1')]
+                ),
+            ],
             [
                 '@method myMethod(int $a = 1)',
                 new Method(