.eslintrc.json

{
  "extends": ["eslint:recommended", "plugin:react/recommended", "standard"],
  "parser": "babel-eslint",
  "plugins": [
    "react"
  ],
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    }
  },
  "settings": {
    "react": {
      "version": "detect"
    }
  },
  "rules": {
    "array-bracket-spacing": ["error", "never"],
    "block-scoped-var": "error",
    "block-spacing": "error",
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "camelcase": "error",
    "comma-dangle": ["error", "never"],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "comma-style": ["error", "last"],
    "complexity": ["error", { "max": 25 }],
    "default-case": "error",
    "dot-notation": "error",
    "eol-last": ["error", "always"],
    "eqeqeq": ["error", "always"],
    "func-call-spacing": ["error", "never"],
    "func-name-matching": "error",
    "func-style": ["error", "declaration", { "allowArrowFunctions": true }],
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "jsx-quotes": ["error", "prefer-single"],
    "key-spacing": [2, {
      "singleLine": {
        "beforeColon": false,
          "afterColon": true
        },
        "multiLine": {
          "beforeColon": false,
          "afterColon": true
        }
    }],
    "keyword-spacing": ["error", { "after": true, "before": true }],
    "linebreak-style": ["error", "unix"],
    "max-depth": ["error", 3],
    "max-len": ["error", 120, {
      "ignoreComments": true,
      "ignoreUrls": true,
      "ignoreStrings": true,
      "ignoreTemplateLiterals": true,
      "ignoreRegExpLiterals": true
    }],
    "max-nested-callbacks": ["error", 3],
    "max-params": ["error", 4],
    "new-cap": "off",
    "newline-after-var": ["warn", "always"],
    "newline-before-return": "error",
    "newline-per-chained-call": ["error", { "ignoreChainWithDepth": 4 }],
    "no-alert": "error",
    "no-array-constructor": "error",
    "no-class-assign": "error",
    "no-continue": "error",
    "no-duplicate-imports": "error",
    "no-eval": "error",
    "no-extend-native": ["error", { "exceptions": ["Object"] }],
    "no-extra-bind": "error",
    "no-floating-decimal": "error",
    "no-lonely-if": "error",
    "no-multi-spaces": "error",
    "no-multi-str": "error",
    "no-multiple-empty-lines": ["error", { "max": 1, "maxEOF": 1 }],
    "no-nested-ternary": "error",
    "no-new-func": "error",
    "no-new-object": "error",
    "no-new-wrappers": "error",
    "no-new": "warn",
    "no-param-reassign": "error",
    "no-proto": "error",
    "no-return-assign": "error",
    "no-self-compare": "error",
    "no-template-curly-in-string": "error",
    "no-throw-literal": "error",
    "no-trailing-spaces": "error",
    "no-undef-init": "error",
    "no-unneeded-ternary": "error",
    "no-unused-expressions": "error",
    "no-use-before-define": "error",
    "no-useless-constructor": "error",
    "no-useless-rename": ["error", {"ignoreImport": true }],
    "no-var": "error",
    "no-void": "error",
    "no-warning-comments": [1, {"terms": ["fixme"]}],
    "no-whitespace-before-property": "error",
    "object-curly-spacing": ["error", "always"],
    "prefer-const": "error",
    "prefer-promise-reject-errors": ["error", {"allowEmptyReject": true}],
    "prefer-spread": "error",
    "prefer-template": "error",
    "quotes": ["error", "single", { "allowTemplateLiterals": true }],
    "space-in-parens": ["error", "never"],
    "spaced-comment": ["error", "always"],
    "wrap-iife": ["error", "any"]
  },
  "globals": {
    "Image": true,
    "localStorage": true,
    "XMLHttpRequest": true,
    "browser": true,
    "chai": true,
    "should": true,
    "it": true,
    "skip": true,
    "jest": true,
    "jsdom": true,
    "beforeAll": true,
    "define": true,
    "describe": true,
    "beforeEach": true,
    "afterEach": true,
    "assert": true,
    "before": true,
    "expect": true,
    "FileReader": true,
    "FormData": true,
    "DOMParser": true,
    "Papa": true,
    "ReactDOM": true,
    "test": true,
    "Blob": true,
    "File": true,
    "URL": true,
    "fetch": true,
    "XMLSerializer": true,
    "Element": true
  }
}