Merge pull request #213 from QuLogic/format

Add eslint, prettier, and re-format JS

.github/workflows/reviewdog.yml

@@ -0,0 +1,16 @@
+name: Linting
+on: [pull_request]
+
+jobs:
+  eslint:
+    name: eslint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: eslint
+        uses: reviewdog/action-eslint@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          reporter: github-check
+          workdir: 'js'

js/.eslintrc.js

@@ -0,0 +1,21 @@
+module.exports = {
+  root: true,
+  env: {
+    browser: true,
+    commonjs: true,
+    es2017: true,
+  },
+  extends: ["eslint:recommended", "prettier"],
+  parserOptions: {
+    ecmaVersion: 9,
+    sourceType: "module",
+  },
+  rules: {
+    "no-unused-vars": [
+      "error",
+      {
+        argsIgnorePattern: "^_",
+      },
+    ],
+  },
+};

js/.prettierrc

@@ -0,0 +1,11 @@
+{
+  "overrides": [
+    {
+      "files": ["webpack.config.js", "src/**/*.js"],
+      "options": {
+        "singleQuote": true,
+        "tabWidth": 4,
+      }
+    }
+  ]
+}