diff --git a/.eslintrc.js b/.eslintrc.js
index c1776da..e613019 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -11,5 +11,13 @@ module.exports = {
         'prettier',
         'prettier/@typescript-eslint',
         'plugin:prettier/recommended'
-    ]
+    ],
+    rules: {
+        'prettier/prettier': [
+            'error',
+            {
+                endOfLine: 'auto'
+            }
+        ]
+    }
 };
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9ae88c4..3e92861 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,14 +7,18 @@ on: pull_request
 jobs:
   test-and-lint:
     name: Run tests and lint
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        node: [12, 14, 16]
 
     steps:
       - uses: actions/checkout@v2
       - name: Install node
         uses: actions/setup-node@v1
         with:
-          node-version: '12.x'
+          node-version: ${{ matrix.node }}
       - run: yarn install
       - run: yarn lint
       - run: yarn typecheck
diff --git a/package.json b/package.json
index 27d8411..9dfed65 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "access": "public"
   },
   "scripts": {
-    "build": "yarn clean; tsc -p tsconfig.build.json",
+    "build": "yarn clean && tsc -p tsconfig.build.json",
     "clean": "rm -rf dist/*",
     "test": "jest",
     "lint": "eslint \"src/**/*.{js,ts}\"",