check outdated code

Author: Hanashi

.github/workflows/typescript.yml

@@ -32,4 +32,26 @@ jobs:
         node-version: "20"
         cache: "npm"
     - run: npm install
-    - run: npx eslint .
+    - run: npx eslint .
+  javascript_sync:
+    name: "Check for outdated JavaScript"
+    needs: tsc
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up node.js
+      uses: actions/setup-node@v3
+      with:
+        node-version: "20"
+        cache: "npm"
+    - run: npm install
+    - run: rm -r files/js/
+    - run: |
+        npx tsc
+    - run: echo "::add-matcher::.github/diff.json"
+    - name: Show diff
+      run: |
+        git checkout -- package-lock.json
+        git diff --exit-code