.eslintrc.json

{
  "env": {
    "browser": true,        // document, window
    "node": true,           // module, require
    "jquery": true,         // $
    "mocha": true           // describe, before, after, it, etc...
    //"greasemonkey": true  // GM_*
  },
  "globals": {
    "StackExchange": false,
    "PR": false
  },
  "extends": "eslint:recommended",
  "rules": {
    "array-bracket-spacing": ["error", "never"],
    "array-callback-return": "error",
    "block-scoped-var": "error",
    "block-spacing": "error",
    "brace-style": ["warn", "1tbs"],
    "callback-return": "error",
    "comma-spacing": "error",
    "comma-style": ["error", "last"],
    "computed-property-spacing": ["error", "never"],
    "consistent-return": "error",
    "consistent-this": "error",
    "curly": ["warn", "all"],
    "default-case": "error",
    "dot-location": ["error", "property"],
    "dot-notation": "error",
    "eol-last": "error",
    "eqeqeq": "error",
    "func-style": ["warn", "declaration"],
    "global-require": "error",
    "handle-callback-err": "error",
    "indent": ["error", 4],
    "key-spacing": "error",
    "keyword-spacing": "error",
    "linebreak-style": ["error", "unix"],
    "no-alert": "warn",
    "no-console": "warn",
    "no-bitwise": "error",
    "no-else-return": "error",
    "no-empty-function": "error",
    "no-eq-null": "error",
    "no-eval": "error",
    "no-floating-decimal": "error",
    "no-implicit-coercion": "error",
    "no-implicit-globals": "error",
    "no-implied-eval": "error",
    "no-invalid-this": "error",
    "no-labels": "error",
    "no-lone-blocks": "error",
    "no-lonely-if": "error",
    "no-loop-func": "error",
    "no-mixed-requires": "error",
    "no-multi-spaces": "error",
    "no-native-reassign": "error",
    "no-octal-escape": "error",
    "no-param-reassign": "error",
    "no-path-concat": "error",
    "no-return-assign": "error",
    "no-self-compare": "error",
    "no-shadow-restricted-names": "error",
    "no-spaced-func": "error",
    "no-trailing-spaces": "error",
    "no-undef": "error",
    "no-undef-init": "error",
    "no-undefined": "error",
    "no-underscore-dangle": "error",
    "no-unmodified-loop-condition": "error",
    "no-useless-computed-key": "error",
    "no-useless-concat": "error",
    "no-whitespace-before-property": "error",
    "object-curly-spacing": ["error", "never"],
    "operator-linebreak": ["error", "after"],
    "quote-props": ["warn", "as-needed", {"keywords": true, "numbers": true}],
    "quotes": ["warn", "single", {"avoidEscape": true}],
    "semi": ["error", "always"],
    "semi-spacing": "error",
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", {"anonymous": "always", "named": "never"}],
    "space-in-parens": "error",
    "space-infix-ops": "error",
    "space-unary-ops": "error",
    "unicode-bom": ["error", "never"],
    "wrap-iife": ["error", "inside"],
    "yoda": ["error", "never"]
  }
}