drop 1.8 support

Author: mglaman

.github/workflows/phpstan-dev.yml

@@ -14,7 +14,6 @@ jobs:
       matrix:
         phpstan:
           - '1.9.x-dev'
-          - '1.8.x-dev'
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v2"

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": "^7.4 || ^8.0",
         "symfony/finder": "~3.4.5 ||^4.2 || ^5.0 || ^6.0",
-        "phpstan/phpstan": "^1.8.0",
+        "phpstan/phpstan": "^1.9.0",
         "symfony/yaml": "~3.4.5 || ^4.2|| ^5.0 || ^6.0",
         "webflo/drupal-finder": "^1.2"
     },
@@ -29,9 +29,6 @@
         "squizlabs/php_codesniffer": "^3.3",
         "symfony/phpunit-bridge": "^3.4.3 || ^4.4 || ^5.4 || ^6.0"
     },
-    "conflict": {
-        "phpstan/phpstan": "^2.0"
-    },
     "minimum-stability": "dev",
     "prefer-stable": true,
     "suggest": {

src/Rules/Drupal/RenderCallbackRule.php

@@ -221,8 +221,7 @@ private function getType(Node\Expr $node, Scope $scope):  Type
                 }
             }
         } elseif ($type instanceof ConstantStringType) {
-            // @phpstan-ignore-next-line
-            if ($type->isClassString()) {
+            if ($type->isClassStringType()->yes()) {
                 return $type;
             }
             // Covers  \Drupal\Core\Controller\ControllerResolver::createController.