Adds type checking

.github/workflows/static-analysis.yml

@@ -0,0 +1,43 @@
+name: static analysis
+
+on:
+  push:
+    branches:
+      - master
+      - '*.x'
+  pull_request:
+  schedule:
+    - cron: '0 0 * * *'
+
+permissions:
+  contents: read
+
+jobs:
+  tests:
+    runs-on: ubuntu-22.04
+
+    strategy:
+      fail-fast: true
+
+    name: Static Analysis
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.2
+          tools: composer:v2
+          coverage: none
+
+      - name: Install dependencies
+        uses: nick-fields/retry@v2
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer update --prefer-stable --prefer-dist --no-interaction --no-progress
+
+      - name: Execute type checking
+        run: vendor/bin/phpstan

composer.json

@@ -18,6 +18,7 @@
         "illuminate/support": "~5.8.0|^6.0|^7.0|^8.0|^9.0|^10.0"
     },
     "require-dev": {
+        "phpstan/phpstan": "^1.10",
         "phpunit/phpunit": "^7.0|^8.0|^9.0"
     },
     "autoload": {

phpstan.neon.dist

@@ -0,0 +1,5 @@
+parameters:
+  paths:
+    - src
+
+  level: 0