Nette\Application\UI\Multiplier factory can return null

Author: zeleznypa

extension.neon

@@ -7,7 +7,6 @@ parameters:
 	stubFiles:
 		- stubs/Application/Routers/RouteList.stub
 		- stubs/Application/UI/Component.stub
-		- stubs/Application/UI/Multiplier.stub
 		- stubs/Application/UI/Presenter.stub
 		- stubs/Caching/Cache.stub
 		- stubs/ComponentModel/Component.stub
@@ -52,6 +51,11 @@ parameters:
 			- forward
 
 services:
+	-
+		class: PHPStan\Stubs\Application\StubFilesExtensionLoader
+		tags:
+			- phpstan.stubFilesExtension
+
 	-
 		class: PHPStan\Reflection\Nette\HtmlClassReflectionExtension
 		tags:

src/Stubs/Application/StubFilesExtensionLoader.php

@@ -0,0 +1,35 @@
+<?php declare(strict_types=1);
+
+namespace PHPStan\Stubs\Application;
+
+use Composer\InstalledVersions;
+use OutOfBoundsException;
+use PHPStan\PhpDoc\StubFilesExtension;
+use function class_exists;
+use function dirname;
+use function version_compare;
+
+class StubFilesExtensionLoader implements StubFilesExtension {
+
+	public function getFiles(): array {
+		$path = dirname(dirname(dirname(__DIR__))) . '/stubs';
+
+		try {
+			$applicationVersion = class_exists(InstalledVersions::class)
+				? InstalledVersions::getVersion('nette/application')
+				: null;
+		} catch (OutOfBoundsException $e) {
+			$applicationVersion = null;
+		}
+
+		$files = [];
+
+		if ($applicationVersion !== null && version_compare($applicationVersion, '3.2.5', '>=')) {
+			$files[] = $path . '/Application/UI/Multiplier1.stub';
+		} else {
+			$files[] = $path . '/Application/UI/Multiplier.stub';
+		}
+
+		return $files;
+	}
+}

stubs/Application/UI/Multiplier1.stub

@@ -0,0 +1,19 @@
+<?php
+
+namespace Nette\Application\UI;
+
+/**
+ * @template T of \Nette\ComponentModel\IComponent|null
+ */
+final class Multiplier extends Component
+{
+    /**
+     * @param callable(string, self<T>) : T $factory
+     */
+    public function __construct(callable $factory);
+
+    /**
+     * @return T
+     */
+    protected function createComponent(string $name): ?\Nette\ComponentModel\IComponent;
+}