.eslintrc.json

{
  "plugins": [
    "react"
  ],
  "parserOptions": {
    "ecmaVersion": 2017,
    "sourceType": "module",
    "ecmaFeatures": {
      "globalReturn": true,
      "impliedStrict": true,
      "jsx": true,
      "experimentalObjectRestSpread": true
    }
  },
  "env": {
    "browser": true,
    "node": true
  },
  "globals": {
    "Promise": true
  },
  "rules": {
    // Possible Errors
    "no-constant-condition": ["error", { "checkLoops": false }],
    "no-dupe-args": "error",
    "no-dupe-keys": "error",
    "no-duplicate-case": "error",
    "no-empty": ["error", { "allowEmptyCatch": true }],
    "no-ex-assign": "error",
    "no-extra-boolean-cast": "error",
    "no-extra-semi": "error",
    "no-func-assign": "warn",
    "no-invalid-regexp": ["error", { "allowConstructorFlags": ["u", "y"] }],
    "no-irregular-whitespace": "warn",
    "no-obj-calls": "error",
    "no-regex-spaces": "warn",
    "no-sparse-arrays": "warn",
    "no-template-curly-in-string": "warn",
    "no-unexpected-multiline": "error",
    "no-unreachable": "warn",
    "no-unsafe-finally": "warn",
    "no-unsafe-negation": "warn",
    "use-isnan": "error",
    "valid-typeof": "warn",
    // Best Practices
    "array-callback-return": "warn",
    "block-scoped-var": "warn",
    "complexity": ["warn", 10],
    "curly": ["warn", "multi-line"],
    "default-case": "warn",
    "dot-location": ["error", "property"],
    "eqeqeq": ["error", "smart"],
    "no-case-declarations": "warn",
    "no-empty-pattern": "error",
    "no-eq-null": "warn",
    "no-extra-bind": "warn",
    "no-fallthrough": "error",  // comment allows fallthrough
    "no-floating-decimal": "error",
    "no-global-assign": "warn",
    "no-invalid-this": "error",
    "no-loop-func": "warn",
    "no-magic-numbers": ["error", {"ignoreArrayIndexes": true, "ignore": [-1, 0, 1, 2]}],
    //"no-multi-spaces": ["warn", {"exceptions": {}}],
    "no-multi-str": "warn",
    "no-new-func": "warn",
    "no-new-wrappers": "error",
    "no-new": "error",
    "no-octal-escape": "warn",
    "no-octal": "warn",
    "no-param-reassign": "warn",
    "no-redeclare": ["error", { "builtinGlobals": true }],
    "no-return-await": "warn",
    "no-self-assign": ["error", {"props": true}],
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-throw-literal": "error",
    "no-unmodified-loop-condition": "warn",
    "no-useless-concat": "warn",
    "no-useless-return": "warn",
    // Strict Mode
    //"strict":["error",
    // Variables
    "no-shadow-restricted-names": "error",
    "no-shadow": "warn",
    "no-undef-init": "warn",
    "no-undef": ["error", { "typeof": true }],
    "no-unused-vars": "warn",
    "no-use-before-define": "warn",
    // Node.js and CommonJS
    "global-require": "warn",
    "no-mixed-requires": "warn",
    "no-new-require": "error",
    "no-path-concat": "warn",
    "no-process-exit": "error",
    // Stylistic Issues
    "array-bracket-spacing": "error",
    "block-spacing": "error",
    "brace-style": ["error", "1tbs", { "allowSingleLine": true}],
    "camelcase": "warn",
    "comma-dangle": ["warn", {
      "arrays": "always-multiline",
      "objects": "always-multiline",
      "imports": "only-multiline",
      "exports": "only-multiline"
    }],
    "comma-spacing": "error",
    "comma-style": "error",
    "computed-property-spacing": "error",
    "eol-last": "error",
    "func-call-spacing": "error",
    "indent": ["error", 2, {
      "SwitchCase": 1,
      "MemberExpression": 1,
      "FunctionDeclaration": { "parameters": "first" },
      "FunctionExpression": { "parameters": "first" },
      "CallExpression": { "arguments": "first" },
      "ArrayExpression": "first",
      "ObjectExpression": "first"
    }],
    "jsx-quotes": ["error", "prefer-single"],
    "key-spacing": "warn",
    "keyword-spacing": ["error", {
      "overrides": {
        "if": { "after": false },
        "for": { "after": false },
        "while": { "after": false },
        "switch": { "after": false }
      }
    }],
    "linebreak-style": "error",
    "max-depth": ["warn", 4],
    "max-len": ["warn", 120],
    "new-cap": "error",
    "new-parens": "error",
    "no-array-constructor": "warn",
    "no-lonely-if": "error",
    "no-mixed-operators": ["warn", { "allowSamePrecedence": true }],
    "no-mixed-spaces-and-tabs": "error",
    "no-multiple-empty-lines": ["warn", {
      "max": 2,
      "maxEOF": 1,
      "maxBOF": 1
    }],
    "no-negated-condition": "warn",
    "no-nested-ternary": "warn",
    "no-new-object": "warn",
    "no-tabs": "warn",
    "no-trailing-spaces": "error",
    "no-unneeded-ternary": "warn",
    "no-whitespace-before-property": "error",
    //"object-curly-newline": ["error", { "consistent": true }],
    "object-curly-spacing": ["warn", "always"],
    "object-property-newline": ["error", { "allowMultiplePropertiesPerLine": true }],
    "one-var": ["error", "never"],
    "operator-linebreak": "error",
    "padded-blocks": ["error", "never"],
    "quotes": ["error", "single", {
      "avoidEscape": true,
      "allowTemplateLiterals": true
    }],
    //"require-jsdoc": ["warn", {
    //  "require": {
    //    "FunctionDeclaration": true,
    //    "MethodDefinition": true,
    //    "ClassDeclaration": true,
    //    "ArrowFunctionExpression": true
    //  }
    //}],
    "semi-spacing": "error",
    "semi": ["error", "never"],
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", "never"],
    "space-in-parens": "error",
    "space-infix-ops": ["error", {"int32Hint": true}],
    "space-unary-ops": ["error", {
      "words": true,
      "nonwords": false
    }],
    // ECMAScript 6
    "arrow-body-style": "error",
    //"arrow-parens": [2, "as-needed", { "requireForBlockBody": true }],
    "arrow-spacing": "error",
    "constructor-super": "error",
    "generator-star-spacing": "error",
    "no-class-assign": "error",
    //"no-confusing-arrow": ["error", {"allowParens": true}],
    "no-const-assign": "error",
    "no-dupe-class-members": "error",
    "no-duplicate-imports": "error",
    "no-new-symbol": "error",
    "no-this-before-super": "error",
    "no-useless-computed-key": "error",
    "no-useless-constructor": "warn",
    "no-useless-rename": "warn",
    "no-var": "error",
    "object-shorthand": ["warn", "always", {
      "avoidQuotes": true,
      "ignoreConstructors": true
    }],
    "prefer-arrow-callback": "warn",
    "prefer-const": "error",
    "prefer-rest-params": "warn",
    "prefer-spread": "warn",
    "prefer-template": "warn",
    "require-yield": "error",
    "rest-spread-spacing": "error",
    "sort-imports": "warn",
    "symbol-description": "error",
    "template-curly-spacing": "error",
    "yield-star-spacing": "error",
    // React
    "react/default-props-match-prop-types": "error",
    "react/no-array-index-key": "warn",
    "react/no-children-prop": "warn",
    "react/no-deprecated": "error",
    "react/no-did-mount-set-state": ["error", "disallow-in-func"],
    "react/no-did-update-set-state": ["error", "disallow-in-func"],
    "react/no-direct-mutation-state": "error",
    "react/no-find-dom-node": "error",
    "react/no-multi-comp": ["warn", { "ignoreStateless": true }],
    "react/no-redundant-should-component-update": "warn",
    "react/no-string-refs": "error",
    //"react/no-typos": "error",
    "react/no-unescaped-entities": "warn",
    "react/no-unknown-property": "warn",
    "react/no-unused-prop-types": "warn",
    "react/no-will-update-set-state": ["error", "disallow-in-func"],
    "react/prefer-es6-class": "warn",
    "react/prefer-stateless-function": "warn",
    "react/prop-types": "warn",
    "react/react-in-jsx-scope": "error",
    "react/require-default-props": "warn",
    "react/require-render-return": "error",
    "react/self-closing-comp": "warn",
    "react/sort-comp": "warn",
    "react/sort-prop-types": "warn",
    "react/style-prop-object": "error",
    "react/void-dom-elements-no-children": "error",
    // jsx
    "react/jsx-boolean-value": "warn",
    "react/jsx-closing-bracket-location": ["warn", "line-aligned"],
    "react/jsx-closing-tag-location": "warn",
//    "react/jsx-curly-spacing": ["warn", {
//      "when": "never",
//      "children": true
//    }],
    "react/jsx-equals-spacing": "warn",
    "react/jsx-filename-extension": ["warn", { "extensions": [".js", ".jsx"] }],
    "react/jsx-first-prop-new-line": "warn", //multiline?
    "react/jsx-indent-props": ["warn", 2],
    "react/jsx-indent": ["warn", 2],
    "react/jsx-key": "warn",
    "react/jsx-max-props-per-line": ["warn", { "maximum": 1, "when": "multiline" }],
    "react/jsx-no-bind": "error",
    "react/jsx-no-comment-textnodes": "error",
    "react/jsx-no-duplicate-props": "error",
    "react/jsx-no-target-blank": "error",
    "react/jsx-no-undef": "error",
    "react/jsx-pascal-case": "error",
    "react/jsx-sort-props": "warn",
    "react/jsx-space-before-closing": "warn",
    "react/jsx-tag-spacing": "error",
    "react/jsx-uses-react": "warn",
    "react/jsx-uses-vars": "warn",
    "react/jsx-wrap-multilines": "warn"
  }
}