[PostRector] Add support for no-namespaced code on UnusedImportRemovi…

…ngPostRector (#3476)

* [PostRector] Add support for no-namespaced code on UnusedImportRemovingPostRector

* implemented 🎉

* rename fixture

packages/PostRector/Rector/UnusedImportRemovingPostRector.php

@@ -13,6 +13,7 @@
 use PhpParser\NodeTraverser;
 use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfoFactory;
 use Rector\Core\Configuration\RectorConfigProvider;
+use Rector\Core\PhpParser\Node\CustomNode\FileWithoutNamespace;
 use Rector\NodeTypeResolver\Node\AttributeKey;
 use Rector\PhpDocParser\NodeTraverser\SimpleCallableNodeTraverser;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
@@ -33,7 +34,7 @@ public function enterNode(Node $node): ?Node
             return null;
         }
 
-        if (! $node instanceof Namespace_) {
+        if (! $node instanceof Namespace_ && ! $node instanceof FileWithoutNamespace) {
             return null;
         }
 
@@ -113,7 +114,7 @@ class SomeClass
     /**
      * @return string[]
      */
-    private function findNonUseImportNames(Namespace_ $namespace): array
+    private function findNonUseImportNames(Namespace_|FileWithoutNamespace $namespace): array
     {
         $names = [];
 
@@ -148,7 +149,7 @@ private function findNonUseImportNames(Namespace_ $namespace): array
     /**
      * @return string[]
      */
-    private function findNamesInDocBlocks(Namespace_ $namespace): array
+    private function findNamesInDocBlocks(Namespace_|FileWithoutNamespace $namespace): array
     {
         $names = [];
 
@@ -169,7 +170,7 @@ private function findNamesInDocBlocks(Namespace_ $namespace): array
     /**
      * @return string[]
      */
-    private function resolveUsedPhpAndDocNames(Namespace_ $namespace): array
+    private function resolveUsedPhpAndDocNames(Namespace_|FileWithoutNamespace $namespace): array
     {
         $phpNames = $this->findNonUseImportNames($namespace);
         $docBlockNames = $this->findNamesInDocBlocks($namespace);

tests/Issues/NoNamespaced/Fixture/no_namespaced_class.php.inc

@@ -0,0 +1,28 @@
+<?php
+
+use PhpParser\Node\Scalar\String_;
+use PhpParser\Node\Stmt\Expression;
+
+class NoNamespacedClass
+{
+    public function run(): String_
+    {
+        return new String_('test');
+    }
+}
+
+?>
+-----
+<?php
+
+use PhpParser\Node\Scalar\String_;
+
+class NoNamespacedClass
+{
+    public function run(): String_
+    {
+        return new String_('test');
+    }
+}
+
+?>

tests/Issues/NoNamespaced/NoNamespacedTest.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Core\Tests\Issues\NoNamespaced;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class NoNamespacedTest extends AbstractRectorTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}

tests/Issues/NoNamespaced/Source/SomeClass.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Core\Tests\Issues\NoNamespaced\Source;
+
+class SomeClass
+{
+}

tests/Issues/NoNamespaced/config/configured_rule.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->removeUnusedImports();
+};