Add ESLint

Author: HardNorth

.eslintrc.json

@@ -0,0 +1,17 @@
+{
+  "extends": "airbnb-base",
+  "parserOptions": {
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "rules": {
+    "indent": [
+      "error",
+      2,
+      {
+        "ObjectExpression": 1,
+        "SwitchCase": 1
+      }
+    ]
+  }
+}

.github/workflows/ci.yml

@@ -26,5 +26,7 @@ jobs:
         run: npm ci
       - name: Test with Jest
         run: npm run test
+      - name: Test with ESLint
+        run: npm run lint
       - name: Build with npm
         run: npm run build

.github/workflows/release.yml

@@ -52,6 +52,8 @@ jobs:
       run: npm ci
     - name: Test with Jest
       run: npm run test
+    - name: Test with ESLint
+      run: npm run lint
     - name: Build with ncc
       run: npm run build