add typecheck workflow

Author: icebob

.github/workflows/typecheck.yml

@@ -0,0 +1,37 @@
+name: TypeScript Type Check
+
+on:
+  push: {}
+  pull_request: {}
+
+jobs:
+  typecheck:
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        node-version: [20.x, 22.x, 24.x]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Setup Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Generate demo project for testing
+      run: node_modules/.bin/moleculer init --answers test/ci/answers.full.json --no-install . tmp-typecheck-project
+
+    - name: Install dependencies in generated project
+      run: npm install
+      working-directory: ./tmp-typecheck-project
+
+    - name: Run TypeScript type checking
+      run: npm run typecheck
+      working-directory: ./tmp-typecheck-project