Configure eslint.

app/.eslintrc.js

@@ -0,0 +1,22 @@
+module.exports = {
+  env: {
+    browser: true,
+    es2020: true,
+  },
+  extends: [
+    'plugin:react/recommended',
+    'airbnb',
+  ],
+  parserOptions: {
+    ecmaFeatures: {
+      jsx: true,
+    },
+    ecmaVersion: 11,
+    sourceType: 'module',
+  },
+  plugins: [
+    'react',
+  ],
+  rules: {
+  },
+};

app/package.json

@@ -26,6 +26,11 @@
   },
   "devDependencies": {
     "eslint": "^7.7.0",
+    "eslint-config-airbnb": "^18.2.0",
+    "eslint-plugin-import": "^2.22.0",
+    "eslint-plugin-jsx-a11y": "^6.3.1",
+    "eslint-plugin-react": "^7.20.6",
+    "eslint-plugin-react-hooks": "^4.1.0",
     "husky": ">=4",
     "lint-staged": ">=10",
     "prettier": "1.19.1",