Feature/Add PHPStan.

.github/workflows/test.yml

@@ -0,0 +1,45 @@
+name: Test
+
+on:
+  push:
+    branches: [ 'main' ]
+  pull_request:
+    types: [ 'opened', 'synchronize', 'reopened' ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version: [ '8.1', '8.2', '8.3' ]
+
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up PHP ${{ matrix.php-version }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          coverage: xdebug
+          tools: composer:v2
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ~/.composer/cache
+          key: php-${{ matrix.php-version }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: php-${{ matrix.php-version }}-composer-
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate
+
+      - name: Install dependencies
+        if: steps.composer-cache.outputs.cache-hit != 'true'
+        run: composer install --prefer-dist --no-progress --no-suggest
+
+      - name: Execute Static Code analysis
+        run: composer analyse

composer.json

@@ -13,9 +13,21 @@
   "require": {
     "php": "^8.1"
   },
+  "require-dev": {
+    "phpstan/phpstan": "^1.0",
+    "phpstan/extension-installer": "^1.3"
+  },
   "autoload": {
     "psr-4": {
       "ComplexHeart\\": "src/"
     }
+  },
+  "scripts": {
+    "analyse": "vendor/bin/phpstan analyse src --no-progress --level=9"
+  },
+  "config": {
+    "allow-plugins": {
+      "phpstan/extension-installer": true
+    }
   }
 }

src/Domain/Contracts/Model/ValueObject.php

@@ -15,7 +15,7 @@ interface ValueObject
     /**
      * Return the attribute values.
      *
-     * @return array
+     * @return array<string, mixed>
      */
     public function values(): array;