Intial release, DEV-45

.github/workflows/phpstan.yml

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+name: ExtDN M2 PHPStan
+on: [push, pull_request]
+
+jobs:
+  phpstan:
+    name: M2 PHPStan
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: extdn/github-actions-m2/magento-phpstan/8.1@master
+        with:
+          composer_name: customgento/module-phpstan

Model/FailingFunction.php

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+<?php
+
+declare(strict_types=1);
+
+namespace CustomGento\Phpstan\Model;
+
+class FailingFunction
+{
+    public const CUSTOMGENTO_PHPSTAN_TEST = 'test';
+
+    public function failingFunction(): array
+    {
+        return [];
+    }
+}

Plugin/Controller/Adminhtml/Product/Action/Attribute/FailingReference.php

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+<?php
+
+declare(strict_types=1);
+
+namespace CustomGento\Phpstan\Plugin\Controller\Adminhtml\Product\Action\Attribute;
+
+use CustomGento\Phpstan\Model\FailingFunction;
+
+class FailingReference
+{
+    private function failingReference(
+    ) {
+        $array = [FailingFunction::CUSTOMGENTO_PHPSTAN_TEST => '123'];
+    }
+}

composer.json

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+{
+    "name": "customgento/module-phpstan",
+    "type": "magento2-module",
+    "license": "proprietary",
+    "version": "1.0.6",
+    "autoload": {
+        "psr-4": {
+            "CustomGento\\Phpstan\\": ""
+        }
+    }
+}