element-web/.eslintrc

{
  "parser": "babel-eslint",
  "plugins": [
    "react",
    "flowtype"
  ],
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",
    "ecmaFeatures": {
      "jsx": true,
      "impliedStrict": true
    }
  },
  "env": {
    "browser": true,
    "amd": true,
    "es6": true,
    "node": true,
    "mocha": true
  },
  "extends": ["eslint:recommended", "plugin:react/recommended"],
  "rules": {
    "no-undef": ["warn"],
    "global-strict": ["off"],
    "no-extra-semi": ["warn"],
    "no-underscore-dangle": ["off"],
    "no-console": ["off"],
    "no-unused-vars": ["off"],
    "no-trailing-spaces": ["warn", {
      "skipBlankLines": true
    }],
    "no-unreachable": ["warn"],
    "no-spaced-func": ["warn"],
    "no-new-func": ["error"],
    "no-new-wrappers": ["error"],
    "no-invalid-regexp": ["error"],
    "no-extra-bind": ["error"],
    "no-magic-numbers": ["error", {
      "ignore": [-1, 0, 1], // usually used in array/string indexing
      "ignoreArrayIndexes": true,
      "enforceConst": true,
      "detectObjects": true
    }],
    "consistent-return": ["error"],
    "valid-jsdoc": ["error"],
    "no-use-before-define": ["error"],
    "camelcase": ["warn"],
    "array-callback-return": ["error"],
    "dot-location": ["warn", "property"],
    "guard-for-in": ["error"],
    "no-useless-call": ["warn"],
    "no-useless-escape": ["warn"],
    "no-useless-concat": ["warn"],
    "brace-style": ["warn", "1tbs"],
    "comma-style": ["warn", "last"],
    "space-before-function-paren": ["warn", "never"],
    "space-before-blocks": ["warn", "always"],
    "keyword-spacing": ["warn", {
      "before": true,
      "after": true
    }],

    // dangling commas required, but only for multiline objects/arrays
    "comma-dangle": ["warn", "always-multiline"],
    // always === instead of ==, unless dealing with null/undefined
    "eqeqeq": ["error", "smart"],
    // always use curly braces, even with single statements
    "curly": ["error", "all"],
    // phasing out var in favour of let/const is a good idea
    "no-var": ["warn"],
    // always require semicolons
    "semi": ["error", "always"],
    // prefer rest and spread over the Old Ways
    "prefer-spread": ["warn"],
    "prefer-rest-params": ["warn"],

    /** react **/

    // bind or arrow function in props causes performance issues
    "react/jsx-no-bind": ["error", {
      "ignoreRefs": true
    }],
    "react/jsx-key": ["error"],
    "react/prefer-stateless-function": ["warn"],

    /** flowtype **/
    "flowtype/require-parameter-type": [
      1,
      {
        "excludeArrowFunctions": true
      }
    ],
    "flowtype/define-flow-type": 1,
    "flowtype/require-return-type": [
      1,
      "always",
      {
        "annotateUndefined": "never",
        "excludeArrowFunctions": true
      }
    ],
    "flowtype/space-after-type-colon": [
      1,
      "always"
    ],
    "flowtype/space-before-type-colon": [
      1,
      "never"
    ]
  },
  "settings": {
    "flowtype": {
      "onlyFilesWithFlowAnnotation": true
    }
  }
}