.eslintrc.json

{
  "plugins": ["import", "jsx-a11y", "react"],
  "parser": "babel-eslint",
  "env": {
    "browser": true,
    "commonjs": true,
    "es6": true,
    "jest": true,
    "node": true
  },
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true,
      "generators": true,
      "experimentalObjectRestSpread": true
    }
  },
  "settings": {
    "import/ignore": [
      "node_modules"
    ],
    "import/extensions": [".js"],
    "import/resolver": {
      "node": {
        "extensions": [".js", ".json"]
      }
    }
  },
  "rules": {
    "array-callback-return": "warn",
    "default-case": ["warn", { "commentPattern": "^no default$" }],
    "dot-location": ["warn", "property"],
    "eqeqeq": ["warn", "allow-null"],
    "guard-for-in": "warn",
    "no-caller": "warn",
    "no-cond-assign": ["warn", "always"],
    "no-const-assign": "warn",
    "no-control-regex": "warn",
    "no-delete-var": "warn",
    "no-dupe-args": "warn",
    "no-dupe-class-members": "warn",
    "no-dupe-keys": "warn",
    "no-duplicate-case": "warn",
    "no-empty-character-class": "warn",
    "no-empty-pattern": "warn",
    "no-eval": "warn",
    "no-ex-assign": "warn",
    "no-extend-native": "warn",
    "no-extra-bind": "warn",
    "no-extra-label": "warn",
    "no-fallthrough": "warn",
    "no-func-assign": "warn",
    "no-implied-eval": "warn",
    "no-invalid-regexp": "warn",
    "no-iterator": "warn",
    "no-label-var": "warn",
    "no-labels": ["warn", { "allowLoop": false, "allowSwitch": false }],
    "no-lone-blocks": "warn",
    "no-loop-func": "warn",
    "no-multi-str": "warn",
    "no-native-reassign": "warn",
    "no-negated-in-lhs": "warn",
    "no-new-func": "warn",
    "no-new-symbol": "warn",
    "no-new-wrappers": "warn",
    "no-obj-calls": "warn",
    "no-octal": "warn",
    "no-octal-escape": "warn",
    "no-redeclare": "warn",
    "no-regex-spaces": "warn",
    "no-script-url": "warn",
    "no-self-assign": "warn",
    "no-self-compare": "warn",
    "no-sequences": "warn",
    "no-shadow-restricted-names": "warn",
    "no-sparse-arrays": "warn",
    "no-template-curly-in-string": "warn",
    "no-this-before-super": "warn",
    "no-throw-literal": "warn",
    "no-undef": "error",
    "no-unexpected-multiline": "warn",
    "no-unreachable": "warn",
    "no-unused-expressions": ["warn", {
      "allowShortCircuit": true,
      "allowTernary": true
    }],
    "no-unused-labels": "warn",
    "no-unused-vars": ["warn", {
      "vars": "local",
      "varsIgnorePattern": "^_",
      "args": "none"
    }],
    "no-use-before-define": ["warn", "nofunc"],
    "no-useless-computed-key": "warn",
    "no-useless-concat": "warn",
    "no-useless-constructor": "warn",
    "no-useless-escape": "warn",
    "no-useless-rename": ["warn", {
      "ignoreDestructuring": false,
      "ignoreImport": false,
      "ignoreExport": false
    }],
    "no-with": "warn",
    "radix": "warn",
    "require-yield": "warn",
    "rest-spread-spacing": ["warn", "never"],
    "strict": ["warn", "never"],
    "use-isnan": "warn",
    "valid-typeof": "warn",
    "import/no-webpack-loader-syntax": "error",
    "react/jsx-equals-spacing": ["warn", "never"],
    "react/jsx-no-duplicate-props": ["warn", { "ignoreCase": true }],
    "react/jsx-no-undef": "error",
    "react/jsx-pascal-case": ["warn", {
      "allowAllCaps": true,
      "ignore": []
    }],
    "react/jsx-uses-react": "warn",
    "react/jsx-uses-vars": "warn",
    "react/no-danger-with-children": "warn",
    "react/no-deprecated": "warn",
    "react/no-direct-mutation-state": "warn",
    "react/no-is-mounted": "warn",
    "react/react-in-jsx-scope": "error",
    "react/require-render-return": "warn",
    "react/style-prop-object": "warn",
    "jsx-a11y/aria-role": "warn",
    "jsx-a11y/img-has-alt": "warn",
    "jsx-a11y/img-redundant-alt": "warn",
    "jsx-a11y/no-access-key": "warn",

    "camelcase": "warn",
    "jsx-quotes": ["error", "prefer-single"],
    "no-console": "warn",
    "quotes": ["error", "single"],
    "array-bracket-spacing": ["error", "never"],
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "comma-spacing": ["error", { "before": false, "after": true }],
    "comma-style": ["error", "last"],
    "comma-dangle": ["warn", {
        "arrays": "always-multiline",
        "objects": "always-multiline",
        "imports": "never",
        "exports": "never",
        "functions": "always-multiline"
    }],
    "computed-property-spacing": ["error", "never"],
    "eol-last": ["error", "always"],
    "func-call-spacing": ["error", "never"],
    "func-names": "warn",
    "func-style": ["error", "declaration", { "allowArrowFunctions": true }],
    "indent": ["error", 2, {
      "SwitchCase": 1,
      "VariableDeclarator": 1,
      "outerIIFEBody": 1,
      "FunctionDeclaration": {
        "parameters": 1,
        "body": 1
      },
      "FunctionExpression": {
        "parameters": 1,
        "body": 1
      }
    }],
    "key-spacing": ["error", { "beforeColon": false, "afterColon": true }],
    "keyword-spacing": ["error", {
      "before": true,
      "after": true,
      "overrides": {
        "return": { "after": true },
        "throw": { "after": true },
        "case": { "after": true }
      }
    }],
    "line-comment-position": ["error", {
      "position": "above",
      "ignorePattern": "",
      "applyDefaultPatterns": true
    }],
    "linebreak-style": ["error", "unix"],
    "lines-around-directive": ["error", {
      "before": "always",
      "after": "always"
    }],
    "max-len": ["warn", 100, 2, {
      "ignoreComments": true,
      "ignoreRegExpLiterals": true,
      "ignoreStrings": true,
      "ignoreTemplateLiterals": true,
      "ignoreTrailingComments": true,
      "ignoreUrls": true
    }],
    "new-cap": ["error", {
      "newIsCap": true,
      "newIsCapExceptions": [],
      "capIsNew": false
    }],
    "newline-after-var": "off",
    "newline-before-return": "off",
    "newline-per-chained-call": ["error", { "ignoreChainWithDepth": 4 }],
    "no-array-constructor": "error",
    "no-bitwise": "error",
    "no-continue": "error",
    "no-lonely-if": "error",
    "no-mixed-operators": ["error", {
      "groups": [
        ["+", "-", "*", "/", "%", "**"],
        ["&", "|", "^", "~", "<<", ">>", ">>>"],
        ["==", "!=", "===", "!==", ">", ">=", "<", "<="],
        ["&&", "||"],
        ["in", "instanceof"]
      ],
      "allowSamePrecedence": false
    }],
    "no-mixed-spaces-and-tabs": "error",
    "no-multiple-empty-lines": ["error", { "max": 2, "maxEOF": 1 }],
    "no-negated-condition": "off",
    "no-nested-ternary": "error",
    "no-new-object": "error",
    "no-plusplus": "error",
    "no-restricted-syntax": [
      "error",
      "LabeledStatement",
      "WithStatement"
    ],
    "no-spaced-func": "error",
    "no-tabs": "error",
    "no-ternary": "off",
    "no-trailing-spaces": "error",
    "no-underscore-dangle": ["warn", { "allowAfterThis": true, "allowAfterSuper": true }],
    "no-unneeded-ternary": ["error", { "defaultAssignment": false }],
    "no-whitespace-before-property": "error",
    "object-curly-spacing": ["error", "always"],
    "object-property-newline": ["error", {
      "allowMultiplePropertiesPerLine": true
    }],
    "one-var": ["error", "never"],
    "one-var-declaration-per-line": ["error", "always"],
    "operator-assignment": ["error", "always"],
    "operator-linebreak": "off",
    "padded-blocks": ["error", "never"],
    "quote-props": ["error", "as-needed", { "keywords": false, "unnecessary": true, "numbers": false }],
    "require-jsdoc": "off",
    "semi": ["error", "always"],
    "semi-spacing": ["error", { "before": false, "after": true }],
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", {
      "anonymous": "always",
      "named": "never",
      "asyncArrow": "always"
    }],
    "space-in-parens": ["error", "never"],
    "space-infix-ops": "error",
    "space-unary-ops": ["error", {
      "words": true,
      "nonwords": false,
      "overrides": {
      }
    }],
    "spaced-comment": ["error", "always"],
    "unicode-bom": ["error", "never"]
  }
}