.eslintrc

{
  "root": true,
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaVersion": 2017,
    "sourceType": "module",
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true
    }
  },
  "env": {
    "browser": true,
    "es6": true,
    "node": true
  },
  "extends": "airbnb-base",
  // required to lint *.js files
  "plugins": [
    "react",
    "html"
  ],
  // check if imports actually resolve
  "settings": {
    "import/resolver": {
      "webpack": {
        "config": "build/webpack.base.config.js"
      }
    }
  },
  // add your custom rules here
  "rules": {
    "no-undefined": "warn",
    "no-unused-vars": [
      "warn",
      {
        "vars": "local",
        "args": "after-used",
        "ignoreRestSiblings": true
      }
    ],
    "import/prefer-default-export": "off",
    "comma-dangle": [
      1,
      "never"
    ],
    "no-undef": "off",
    "no-restricted-syntax": [
      "error",
      "WithStatement"
    ],
    "no-unused-expressions": [
      "warn"
    ],
    "class-methods-use-this": [
      "off"
    ],
    "global-require": "warn",
    "no-script-url": "warn",
    "no-nested-ternary": "off",
    "arrow-body-style": [
      "warn"
    ],
    "max-len": "warn",
    "import/no-webpack-loader-syntax": "warn",
    "no-underscore-dangle": "off",
    "prefer-arrow-callback": [
      "error",
      {
        "allowUnboundThis": true
      }
    ],
    "no-mixed-operators": [
      "warn"
    ],
    // allow debugger during development
    "no-debugger": 0
  }
}