Add TS typetest matrix

.github/workflows/test.yaml

@@ -38,3 +38,35 @@ jobs:
 
       - name: Check build
         run: npm run build
+
+  test-types:
+    name: Test Types with TypeScript ${{ matrix.ts }}
+
+    needs: [build]
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node: ['16.x']
+        ts: ['4.1', '4.2', '4.3', '4.4', '4.5', '4.6', '4.7', '4.8', '4.9.2-rc']
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Use node ${{ matrix.node }}
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Install TypeScript ${{ matrix.ts }}
+        run: npm i --save-dev typescript@${{ matrix.ts }}
+
+      - name: Test types
+        run: |
+          npm run tsc -- --version
+          npm run check-types
+          npm run test:types

package.json

@@ -55,7 +55,8 @@
     "build": "rollup -c",
     "prepublishOnly": "npm run clean && npm run check-types && npm run format:check && npm run lint && npm test",
     "examples:lint": "eslint --ext js,ts examples",
-    "examples:test": "cross-env CI=true babel-node examples/testAll.js"
+    "examples:test": "cross-env CI=true babel-node examples/testAll.js",
+    "tsc": "tsc"
   },
   "dependencies": {},
   "devDependencies": {