.eslintrc.json

{
  "env": {
    "browser": true,
    "es6": true,
    "node": true
  },
  "extends": "eslint:recommended",
  "parser": "babel-eslint",
  "parserOptions": {
     "sourceType": "module"
   },
  "plugins": [
    "react",
    "flowtype",
    "import",
    "promise",
    "jsx-a11y",
    "babel"
  ],
  "settings": {
     "import/extensions": [".js", ".jsx"],
     "import/resolver": {
       "node": {
         "extensions": [".js", ".jsx", ".json"]
       }
     }
   },
  "rules": {
    "array-bracket-spacing": ["warn", "never"],
    "arrow-parens": ["error", "as-needed", {"requireForBlockBody": true}],
    "comma-spacing": ["warn", {"before": false, "after": true}],
    "computed-property-spacing": ["warn", "never"],
    "comma-dangle": ["error", "always-multiline"],
    "eqeqeq": ["error", "allow-null"],
    "indent": ["error", 2, {"SwitchCase": 1}],
    "jsx-quotes": ["warn", "prefer-double"],
    "key-spacing": ["warn", {"beforeColon": false, "afterColon": true}],
    "linebreak-style": ["error", "unix"],
    "max-len": ["warn", 80, 2, {
      "ignorePattern": "^\\s*import\\s.+from\\s+/",
      "ignoreUrls": true
    }],
    "no-case-declarations": "off",
    "no-console": "warn",
    "no-debugger": "warn",
    "no-undef": "error",
    "no-unreachable": "error",
    "no-unused-vars": ["warn", {"args": "none"}],
    "quotes": ["error", "single", "avoid-escape"],
    "react/jsx-uses-react": "error",
    "react/jsx-uses-vars": "error",
    "react/react-in-jsx-scope": "error",
    "react/jsx-closing-bracket-location": ["warn", {
      "nonEmpty": "after-props",
      "selfClosing": "tag-aligned"
    }],
    "react/jsx-no-undef": "error",
    "react/jsx-key": "warn",
    "react/no-direct-mutation-state": "error",
    "semi": ["warn", "always"],
    "space-before-function-paren": ["warn", "never"],
    "space-in-parens": ["warn", "never"],
    "import/default": "warn",
    "import/export": "warn",
    "import/named": "warn",
    "import/namespace": ["error", {"allowComputed": true}],
    "import/no-amd": "warn",
    "import/no-duplicates": "warn",
    "import/no-extraneous-dependencies": "warn",
    "import/no-named-as-default": "warn",
    "import/no-named-as-default-member": "warn",
    "import/no-unresolved": ["warn", { "commonjs": true }],
    "flowtype/define-flow-type": "warn",
    "flowtype/require-valid-file-annotation": "warn",
    "flowtype/use-flow-type": "warn",
    "babel/new-cap": "warn",
    "babel/object-curly-spacing": "warn",
    "babel/no-invalid-this": "warn"
  }
}