.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 6, // make ES6/ES2015 available
    "sourceType": "script", // disable ES6/ES2015 module syntax, since it's not used currently. (Recommend to use it)
    "ecamFeature": {
      "globalReturn": false, // disallow global definition
      "impliedStrict": true, // use strict mode
      "jsx": false, // disallow jsx syntax, since ReactJS is not used
      "experimentalObjectRestSpread": false // disallow rest operator from ES6/ES2015, since it's subject to change with ES7/8
    }
  },
  "plugins": [],
  "extends": "eslint:recommended", // using essential rule set from ESLint package
  "env": {
    "browser": true, // allow existense of native globals for browser
    "node": true, // allow existense of native globals for nodeJS
    "es6": true, // allow existense of native globals/reserved words from ES6/ES2015
    "amd": true, // allow existense of native globals from AMD-like environment
    "jquery": true, // allow existense of native gloabls from jQuery
    // TODO: should make exception only to the unit test files. Move these configuration into the test folders.
    "mocha": true, // allow existense of native globals from Mocha
    "qunit": true // allow existense of native globals from qunit
  },
  // TODO: globals should likely disappear once all these globals are removed and modularized.
  "globals": {
    "chUtils": true,
    "contrail": true,
    "covdc": true,
    "cowc": true,
    "cowu": true,
    "cowf": true,
    "cowl": true,
    "cowm": true,
    "cowch": true,
    "ctwDir": true,
    "ctwc": true,
    "ctwgc": true,
    "ctwm": true,
    "ctwl": true,
    "globalObj": true,
    "grUtils": true
  },
  "rules": {
    // relax/customize the essential rule set for R3.2
    // TODO: need to update/evovlve based on the readiness of codebase.
    "block-scoped-var": "off",
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "camelcase": "warn",
    "comma-dangle": ["error", "only-multiline"],
    "consistent-return": "error",
    // TODO Should be turn on as "error" once starting to use ES6/ES2015 syntax
    "constructor-super": "off",
    "curly": "warn",
    "dot-location": ["error", "property"],
    "dot-notation": "error",
    "eol-last": "error",
    // To avoid potential debugging difficulty
    "eqeqeq": "error",
    "indent": ["warn", 4, {
      "SwitchCase": 1,
      "VariableDeclarator": 1
    }],
    "new-cap": "error",
    "no-caller": "error",
    "no-case-declarations": "warn",
    "no-console": "off",
    "no-eval": "error",
    "no-extend-native": "warn",
    "no-implicit-globals": "warn",
    "no-irregular-whitespace": ["error", {
      "skipStrings": true,
      "skipComments": true,
      "skipTemplates": true
    }],
    "no-lone-blocks": "error",
    "no-loop-func": "warn",
    // To encourage constant variables for better maintainability and readability
    "no-magic-numbers": ["warn", {
      "ignoreArrayIndexes": true,
      // TODO: turn on when starting to use ES6/ES2015 syntax
      "enforceConst": false
    }],
    "no-multi-spaces": ["error", {
      "exceptions": {
        "Property": true,
        "VariableDeclarator": true,
        "ImportDeclaration": true
      }
    }],
    "no-multi-str": "error",
    "no-new-func": "error",
    "no-return-assign": "error",
    "no-script-url": "error",
    "no-self-compare": "error",
    "no-unmodified-loop-condition": "error",
    "no-unused-expressions": "error",
    "no-useless-concat": "warn",
    "no-useless-escape": "warn",
    "quotes": ["error", "double", {
      "avoidEscape": true,
      "allowTemplateLiterals": true
    }],
    "vars-on-top": "warn",
    "semi": "error",
    "yoda": "warn"
  }
}