My latest .eslintrc

.eslintrc

{
  "ecmaFeatures": {
    "arrowFunctions": true,
    "binaryLiterals": false,
    "blockBindings": true,
    "classes": true,
    "defaultParams": true,
    "destructuring": true,
    "forOf": false,
    "generators": true,
    "modules": true,
    "objectLiteralComputedProperties": true,
    "objectLiteralDuplicateProperties": false,
    "objectLiteralShorthandMethods": true,
    "objectLiteralShorthandProperties": true,
    "octalLiterals": true,
    "regexUFlag": true,
    "regexYFlag": true,
    "superInFunctions": false,
    "templateStrings": true,
    "unicodeCodePointEscapes": false,
    "globalReturn": false,
    "jsx": true
  },

  "parser": "babel-eslint",

  "plugins": [
    "react"
  ],

  "env": {
    "browser": true,
    "node": true,
    "amd": false,
    "mocha": true,
    "jasmine": false,
    "phantomjs": false,
    "prototypejs": false,
    "shelljs": false,
    "es6": true
  },

  "rules": {
    "no-alert": 2,
    "no-array-constructor": 2,
    "no-bitwise": 0,
    "no-caller": 2,
    "no-catch-shadow": 0,
    // "no-comma-dangle": 0,    // Deprecated in v1.0
    "no-cond-assign": 2,
    "no-console": 1,            // Prefer `debug`
    "no-constant-condition": 2,
    "no-control-regex": 2,
    "no-debugger": 2,
    "no-delete-var": 2,
    "no-div-regex": 0,
    "no-dupe-keys": 2,
    "no-dupe-args": 2,
    "no-else-return": 0,
    "no-empty": 2,
    "no-empty-class": 2,
    "no-empty-label": 2,
    "no-eq-null": 0,
    "no-eval": 2,
    "no-ex-assign": 2,
    "no-extend-native": 2,
    "no-extra-bind": 2,
    "no-extra-boolean-cast": 2,
    "no-extra-parens": 0,
    "no-extra-semi": 2,
    "no-extra-strict": 2,
    "no-fallthrough": 2,
    "no-floating-decimal": 0,
    "no-func-assign": 2,
    "no-implied-eval": 2,
    "no-inline-comments": 0,
    "no-inner-declarations": [2, "functions"],
    "no-invalid-regexp": 2,
    "no-irregular-whitespace": 2,
    "no-iterator": 2,
    "no-label-var": 2,
    "no-labels": 2,
    "no-lone-blocks": 2,
    "no-lonely-if": 0,
    "no-loop-func": 2,
    "no-mixed-requires": [1, true],
    "no-mixed-spaces-and-tabs": [2, false],
    "no-multi-spaces": [2, { exceptions: { "VariableDeclarator": true } }],
    "no-multi-str": 2,
    "no-multiple-empty-lines": [0, {"max": 2}],
    "no-native-reassign": 2,
    "no-negated-in-lhs": 2,
    "no-nested-ternary": 0,
    "no-new": 2,
    "no-new-func": 2,
    "no-new-object": 2,
    "no-new-require": 0,
    "no-new-wrappers": 2,
    "no-obj-calls": 2,
    "no-octal": 2,
    "no-octal-escape": 2,
    "no-path-concat": 0,
    "no-plusplus": 0,
    "no-process-env": 0,
    "no-process-exit": 2,
    "no-proto": 2,
    "no-redeclare": 2,
    "no-regex-spaces": 2,
    "no-reserved-keys": 0,
    "no-restricted-modules": 0,
    "no-return-assign": 2,
    "no-script-url": 2,
    "no-self-compare": 0,
    "no-sequences": 2,
    "no-shadow": 2,
    "no-shadow-restricted-names": 2,
    "no-space-before-semi": 0,
    "no-spaced-func": 2,
    "no-sparse-arrays": 2,
    "no-sync": 0,
    "no-ternary": 0,
    "no-trailing-spaces": 2,
    "no-throw-literal": 0,
    "no-undef": 2,
    "no-undef-init": 2,
    "no-undefined": 0,
    "no-underscore-dangle": 2,
    "no-unreachable": 2,
    "no-unused-expressions": 2,
    "no-unused-vars": [1, {"vars": "all", "args": "after-used"}],
    "no-use-before-define": 2,
    "no-void": 0,
    "no-var": 0,
    "no-warning-comments": [0, { "terms": ["todo", "fixme", "xxx"], "location": "start" }],
    "no-with": 2,
    "no-wrap-func": 2,

    "block-scoped-var": 0,
    "brace-style": [0, "1tbs"],
    "camelcase": 2,
    "comma-dangle": [1, "always-multiline"],
    "comma-spacing": 2,
    "comma-style": 0,
    "complexity": [0, 11],
    "consistent-return": 2,
    "consistent-this": [0, "that"],
    "curly": [2, "all"],
    "default-case": 0,
    "dot-notation": [2, { "allowKeywords": true }],
    "eol-last": 2,
    "eqeqeq": 2,
    "func-names": 0,
    "func-style": [0, "declaration"],
    "generator-star": 0,
    "global-strict": [0, "never"],
    "guard-for-in": 0,
    "handle-callback-err": 0,
    "indent": [2, 2],
    "key-spacing": [2, { "beforeColon": false, "afterColon": true }],
    "max-depth": [0, 4],
    "max-len": [0, 80, 4],
    "max-nested-callbacks": [0, 2],
    "max-params": [0, 3],
    "max-statements": [0, 10],
    "new-cap": 2,
    "new-parens": 2,
    "one-var": 0,
    "operator-assignment": [0, "always"],
    "padded-blocks": 0,
    "quote-props": 0,
    "quotes": [2, "double"],
    "radix": 0,
    "semi": 2,
    "semi-spacing": [2, {"before": false, "after": true}],
    "sort-vars": 0,
    "space-after-function-name": [2, "never"],
    "space-after-keywords": [2, "always"],
    "space-before-blocks": [0, "always"],
    "space-before-function-parentheses": [0, "always"],
    "space-in-brackets": [0, "never"],
    "space-in-parens": [0, "never"],
    "space-infix-ops": 2,
    "space-return-throw-case": 2,
    "space-unary-ops": [2, { "words": true, "nonwords": false }],
    "spaced-line-comment": [0, "always"],
    "strict": 2,
    "use-isnan": 2,
    "valid-jsdoc": 0,
    "valid-typeof": 2,
    "vars-on-top": 0,
    "wrap-iife": 0,
    "wrap-regex": 0,
    "yoda": [2, "never"],

    // eslint-plugin-react rules
    "react/display-name": 1,
    "react/jsx-uses-react": 1,
    "react/jsx-uses-vars": 1,
    "react/no-did-mount-set-state": 1,
    "react/no-did-update-set-state": 1,
    "react/no-multi-comp": 2,
    "react/prop-types": 0,
    "react/react-in-jsx-scope": 2,
    "react/self-closing-comp": 1,
    "react/wrap-multilines": 2
  }
}

You'll need:

• https://github.com/eslint/eslint
• https://github.com/yannickcr/eslint-plugin-react