chore: add composer unused

.github/workflows/unused.yml

@@ -47,16 +47,6 @@ jobs:
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
-      - name: Create PHPStan cache directory
-        run: mkdir -p build/phpstan
-
-      - name: Cache PHPStan results
-        uses: actions/cache@v2
-        with:
-          path: build/phpstan
-          key: ${{ runner.os }}-phpstan-${{ github.sha }}
-          restore-keys: ${{ runner.os }}-phpstan-
-
       - name: Install dependencies
         run: |
           composer -q config -g github-oauth.github.com "${{ secrets.GITHUB_TOKEN }}"
@@ -67,4 +57,4 @@ jobs:
           fi
 
       - name: Detect unused packages
-        run: composer-unused -vvv --ansi --no-interaction --no-progress --excludePackage=php
+        run: composer-unused -vvv --output-format=github --ansi --no-interaction --no-progress

composer.json

@@ -35,7 +35,8 @@
         "phpmetrics/phpmetrics": "^2.7",
         "vimeo/psalm": "^4.18",
         "psalm/plugin-phpunit": "^0.13",
-        "rector/rector": "0.12.13"
+        "rector/rector": "0.12.13",
+        "icanhazstring/composer-unused": "^0.8.1"
     },
     "suggest": {
         "ext-fileinfo": "Improves mime type detection for files"