Run type tests against different versions of ESLint and TS during CI

.github/workflows/ci.yml

@@ -118,6 +118,49 @@ jobs:
       - name: ▶️ Run test:types script
         run: npm run test:types
 
+  type-tests:
+    name: 🧪 Type tests with ESLint ${{ matrix.eslint }} and TypeScript ${{ matrix.ts }}
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        eslint: [8, 9]
+        ts: [5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6]
+
+    steps:
+      - name: ⬇️ Checkout repo
+        uses: actions/checkout@v4
+
+      - name: ⎔ Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 18
+
+      - name: 📥 Install dependencies
+        run: npm install
+
+      - name: Pack the package
+        id: pack
+        run: npm install "$(npm pack | tail -n1)"
+
+      - name: 📥 Uninstall @types/eslint
+        if: matrix.eslint != 8
+        run: npm uninstall @types/eslint
+
+      - name: 📥 Install ESLint version ${{ matrix.eslint }}
+        run: npm install --save-dev eslint@${{ matrix.eslint }}
+
+      - name: 📥 Install TypeScript version ${{ matrix.ts }}
+        run: npm install --save-dev typescript@${{ matrix.ts }} -f
+
+      - name: ▶️ Run test:types script
+        run: npm run test:types
+
+      - name: 📝 List version of ESLint
+        run: npm why eslint @types/eslint
+
   release:
     name: 🚀 Release
     needs: [ lint, test ]