.eslintrc.json

{
  "plugins": [
    "babel",
    "react"
  ],
  "extends": ["eslint:recommended", "plugin:react/recommended"],
  "settings": {
    "react": {
      "createClass": "createReactClass",
      "pragma": "React",
      "version": "16.5"
    },
    "propWrapperFunctions": [ "forbidExtraProps" ]
  },
  "rules": {
    "array-bracket-spacing": 2,
    "arrow-spacing": [2, { "before": true, "after": true }],
    "block-spacing": 2,
    "brace-style": [2, "1tbs"],
    "camelcase": 2,
    "comma-dangle": [2, "never"],
    "comma-spacing": 2,
    "comma-style": [2, "last"],
    "computed-property-spacing": 2,
    "constructor-super": 2,
    "curly": 2,
    "dot-notation": 2,
    "eol-last": 2,
    "eqeqeq": 2,
    "func-call-spacing": 2,
    "indent": [2, 2, { "SwitchCase": 1 }],
    "jsx-quotes": 2,
    "key-spacing": [2, { "beforeColon": false, "afterColon": true }],
    "keyword-spacing": [2, { "before": true, "after": true }],
    "linebreak-style": [2, "unix"],
    "max-len": [1, 120, 4],
    "max-lines": [1, 500],
    "max-statements": [1, 50],
    "new-parens": 2,
    "no-alert": 2,
    "no-array-constructor": 2,
    "no-caller": 2,
    "no-case-declarations": 2,
    "no-const-assign": 2,
    "no-dupe-class-members": 2,
    "no-extend-native": 2,
    "no-nested-ternary": 0,
    "no-tabs": 2,
    "no-trailing-spaces": 2,
    "no-unused-vars": [2, { "args": "none" }],
    "no-useless-constructor": 2,
    "no-useless-rename": 2,
    "no-var": 2,
    "no-whitespace-before-property": 2,
    "one-var": [2, { "var": "never", "let": "never", "const": "never" }],
    "quotes": [2, "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
    "quote-props": [2, "as-needed"],
    "semi": [2, "always"],
    "space-before-blocks": [2, "always"],
    "space-in-parens": [2, "never"],
    "space-infix-ops": 2,
    "space-unary-ops": [2, { "words": true, "nonwords": false }],
    "valid-jsdoc": [2, { "requireReturn": false, "requireReturnDescription": false, "requireParamDescription": false }],
    "yoda": 2,
    "babel/no-invalid-this": 2
  },
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true
    }
  },
  "globals": {
    "__dirname": false,
    "clearInterval": false,
    "clearTimeout": false,
    "confirm": false, // window.confirm
    "console": false,
    "document": false,
    "fetch": false, // fetch api
    "global": false,
    "Headers": false, // fetch api
    "location": false,
    "module": false,
    "process": false,
    "Promise": false,
    "require": false,
    "setInterval": false,
    "setTimeout": false,
    "URLSearchParams": false,
    "window": false
  },
  "env": {
    "es6": true,
    "jest": true
  }
}