.eslintrc.json

{
  "parser": "babel-eslint",
    "env": {
      "es6": true,
      "node": true,
      "browser": true
    },
    "extends": "eslint:recommended",
    "parserOptions": {
      "ecmaVersion": 7,
      "sourceType": "module",
      "ecmaFeatures": {
        "jsx": true,
        "experimentalObjectRestSpread": true,
        "classes": true
      }
    },
    "plugins": [
      "react"
    ],
    "rules": {
      "indent": [
        "error",
      2
      ],
      "quotes": [
        "error",
      "single"
      ],
      "linebreak-style": [
        "error",
      "unix"
      ],
      "semi": [
        "error",
      "never"
      ],
      "comma-dangle": [
        "warn",
      "always-multiline"
      ],
      "constructor-super": "error",
      "no-confusing-arrow": "error",
      "no-constant-condition": "error",
      "no-class-assign": "error",
      "no-const-assign": "error",
      "no-dupe-class-members": "error",
      "no-var": "warn",
      "no-this-before-super": "error",
      "no-extra-boolean-cast": "off",
      "object-shorthand": [
        "error",
      "always"
      ],
      "prefer-spread": "warn",
      "prefer-template": "warn",
      "require-yield": "error",
      "jsx-quotes": "warn",
      "react/jsx-boolean-value": "warn",
      "react/jsx-curly-spacing": "warn",
      "react/jsx-no-duplicate-props": "warn",
      "react/jsx-no-undef": "warn",
      "react/jsx-uses-react": "warn",
      "react/jsx-uses-vars": "warn",
      "react/no-danger": "warn",
      "react/no-did-mount-set-state": "warn",
      "react/no-did-update-set-state": "warn",
      "react/no-direct-mutation-state": "warn",
      "react/no-multi-comp": "warn",
      "react/no-set-state": "warn",
      "react/no-unknown-property": "warn",
      "react/prefer-es6-class": "warn",
      "react/prop-types": "warn",
      "react/react-in-jsx-scope": "warn",
      "react/self-closing-comp": "warn",
      "react/sort-comp": "warn"
    }
}