#459 multiple tasks in codebase book/9-end

book/1-begin/.eslintrc.js

@@ -0,0 +1,55 @@
+module.exports = {
+    parser: 'babel-eslint',
+    extends: ['airbnb', 'plugin:prettier/recommended'],
+    env: {
+      browser: true,
+      jest: true,
+    },
+    plugins: ['react', 'jsx-a11y', 'import', 'prettier'],
+    rules: {
+      'prettier/prettier': [
+        'error',
+        {
+          singleQuote: true,
+          trailingComma: 'all',
+          arrowParens: 'always',
+          printWidth: 100,
+          semi: true
+        },
+      ],
+      'camelcase': 'off',
+      'no-underscore-dangle': ['error', { allow: ['_id'] }],
+      'no-mixed-operators': 'off',
+      'prefer-arrow-callback': 'error',
+      'prefer-destructuring': [
+        'error',
+        {
+          VariableDeclarator: {
+            array: false,
+            object: true,
+          },
+          AssignmentExpression: {
+            array: true,
+            object: false,
+          },
+        },
+        {
+          enforceForRenamedProperties: false,
+        },
+      ],
+      'import/prefer-default-export': 'off',
+      'jsx-a11y/anchor-is-valid': 'off',
+      'react/jsx-wrap-multilines': 'off',
+      'react/destructuring-assignment': 'off',
+      'react/no-danger': 'off',
+      'react/jsx-one-expression-per-line': 'off',
+      'react/jsx-props-no-spreading': 'off',
+      'react/react-in-jsx-scope': 'off',
+      'react/jsx-filename-extension': [
+        'error',
+        {
+          extensions: ['.jsx'],
+        },
+      ],
+    },
+  };

book/1-begin/package.json

@@ -5,7 +5,8 @@
   "scripts": {
     "dev": "next",
     "build": "next build",
-    "start": "next start"
+    "start": "next start",
+    "lint": "eslint '**/*.jsx'"
   },
   "dependencies": {
     "@material-ui/core": "^4.11.4",
@@ -15,5 +16,16 @@
     "react": "^16.13.1",
     "react-dom": "^16.13.1"
   },
-  "devDependencies": {}
+  "devDependencies": {
+    "babel-eslint": "^10.1.0",
+    "eslint": "^6.7.2",
+    "eslint-config-airbnb": "^18.2.1",
+    "eslint-config-prettier": "^6.15.0",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-jsx-a11y": "^6.4.1",
+    "eslint-plugin-prettier": "^3.1.4",
+    "eslint-plugin-react": "^7.21.5",
+    "eslint-plugin-react-hooks": "^4.2.0",
+    "prettier": "^2.2.1"
+  }
 }

book/1-begin/test.jsx

@@ -0,0 +1,4 @@
+[1, 2, 3].map((x) => {
+  const y = x + 1;
+  return x * y;
+});