Add dependency checker

.github/workflows/dependency.yml

@@ -0,0 +1,50 @@
+on:
+  - pull_request
+  - push
+
+name: dependency checker
+
+jobs:
+  mutation:
+    name: PHP ${{ matrix.php }}-${{ matrix.os }}
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+
+        php:
+          - "8.0"
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2.3.4
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "${{ matrix.php }}"
+          tools: composer:v2, cs2pr
+          coverage: none
+
+      - name: Determine composer cache directory
+        run: echo "COMPOSER_CACHE_DIR=$(composer config cache-dir)" >> $GITHUB_ENV
+
+      - name: Cache dependencies installed with composer
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.COMPOSER_CACHE_DIR }}
+          key: php${{ matrix.php }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: |
+            php${{ matrix.php }}-composer-
+
+      - name: Update composer
+        run: composer self-update
+
+      - name: Install dependencies with composer
+        run: composer update --prefer-dist --no-interaction --no-progress --optimize-autoloader --ansi
+
+      - name: Check dependency
+        run: vendor/bin/composer-require-checker

composer.json

@@ -20,6 +20,7 @@
         "yiisoft/json": "^1.0"
     },
     "require-dev": {
+        "maglnet/composer-require-checker": "^3.1",
         "phpunit/phpunit": "^9.5",
         "roave/infection-static-analysis-plugin": "^1.7",
         "spatie/phpunit-watcher": "^1.23",

dependency-checker.json

@@ -0,0 +1,5 @@
+{
+    "scan-files": [
+        "src/*.php"
+    ]
+}