add type check workflow

.github/workflows/check.yml

@@ -0,0 +1,27 @@
+---
+name: Check
+
+on:
+  push:
+    branches:
+      - "**"
+
+jobs:
+  typecheck:
+    name: Typecheck (Node.js v${{ matrix.node }})
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Setup Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: "18.x"
+          registry-url: "https://npm.pkg.github.com"
+      - run: npm install
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.SEAMAPI_NPM_TOKEN }}
+      # - run: npm run build
+      - name: Check types
+        run: npm run typecheck