Migrate core JavaScript to TypeScript (#2582)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.github/workflows/type-check.yml

@@ -0,0 +1,45 @@
+name: Type Check
+
+on:
+  pull_request: null
+  push:
+    branches:
+      - main
+      - dev
+
+env:
+  NODE: 20
+
+permissions:
+  contents: read
+
+jobs:
+  type-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v6
+
+      - name: Cache turbo build setup
+        uses: actions/cache@v4
+        with: 
+          path: .turbo
+          key: ${{ runner.os }}-turbo-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-turbo-
+
+      - name: Install PNPM
+        uses: pnpm/action-setup@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: "${{ env.NODE }}"
+          cache: 'pnpm'
+
+      - name: Install pnpm dependencies
+        run: pnpm install
+
+      - name: Run type-check
+        run: pnpm run type-check
+