.eslintrc

{
  "extends": "eslint:recommended",

  "parser": "babel-eslint",

  "env": {
    "browser": true,
    "es6": true,
  },

  "parserOptions": {
    "sourceType": "module"
  },

  "rules":{
    "no-debugger": "warn",
    "no-console": ["warn", { allow: ["warn", "error", "info"] }],
    "comma-dangle": "error",
    "no-negated-in-lhs": "error",
    "block-scoped-var": "error",
    "complexity": ["error", 40],
    "default-case": "error",
    "dot-notation": "error",
    "eqeqeq": "error",
    "no-alert": "error",
    "no-caller": "error",
    "no-else-return": 1,
    "no-labels": "off",
    "no-eq-null": "error",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-extra-label": "error",
    "no-floating-decimal": "error",
    "no-implied-eval": "error",
    "no-iterator": "error",
    "no-lone-blocks": "error",
    "no-multi-str": "error",
    "no-native-reassign": "error",
    "no-new-func": "error",
    "no-new-wrappers": "error",
    "no-new": "error",
    "no-octal-escape": "error",
    "no-proto": "error",
    "no-script-url": "error",
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-useless-call": "error",
    "no-with": "error",
    "radix": "error",
    "wrap-iife": "error",
    "yoda": "error",
    "no-catch-shadow": "error",
    "no-label-var": "error",
    "no-shadow-restricted-names": "error",
    "no-shadow": "error",
    "no-undef-init": "error",
    "no-unused-vars": ["error", { "args": "none", "ignoreRestSiblings": true }],
    "callback-return": "error",
    "no-mixed-requires": "error",
    "no-path-concat": "error",
    "no-sync": "error",
    "brace-style": "error",
    "camelcase": ["error", {"properties": "always"}],
    "comma-spacing": ["error", {"before": false, "after": true}],
    "consistent-this": ["error", "self"],
    "eol-last": "error",
    "func-style": ["off", "declaration"],
    "indent": ["error", 2],
    "max-nested-callbacks": ["error", 6],
    "new-cap": "off",
    "new-parens": "error",
    "no-array-constructor": "error",
    "no-lonely-if": "error",
    "no-nested-ternary": "error",
    "no-new-object": "error",
    "object-shorthand": "error",
    "no-spaced-func": "error",
    "no-trailing-spaces": "error",
    "no-unneeded-ternary": "error",
    "quotes": ["error", "single", "avoid-escape"],
    "semi-spacing": ["error", {"before": false, "after": true}],
    "semi": ["error", "always"],
    "space-before-blocks": ["error", "always"],
    "space-before-function-paren": ["error", "never"],
    "space-infix-ops": "error",
    "space-unary-ops": ["error", { "words": true, "nonwords": false }],
    "arrow-spacing": "error",
    "constructor-super": "error",
    "no-var": "error",
    "prefer-const": ["error", {"destructuring": "all"}],
    "prefer-spread": "error",
    "require-yield": "error",
    "max-params": ["error", 6],
    "no-bitwise": "error",
    "id-match": ["error", "^[a-zA-Z_$]+[a-zA-Z0-9_]*$", {"properties": false}],
    "linebreak-style": ["error", "unix"],
    "curly": ["error", "multi-line", "consistent"],
    "no-restricted-properties": ["error", {
      "object": "Object",
      "property": "assign",
      "message": "Please use object spread {...} instead."
    }],
    "no-restricted-globals": ["error", "encodeURI"], // if you think you want this, you probably want encodeURIComponent instead
    "keyword-spacing": ["error", { "before": true, "after": true }],
    "no-underscore-dangle": ["error", { "allowAfterThis": true }]
  },

  "overrides": [
    {
      "files": [ "**/*.test.js" ],
      "env": { "mocha": true },
      "globals": {"sinon": true, "expect": true},
      "rules": {
        "no-underscore-dangle": "off"
      }
    },
    {
      "files": [ "*.js" ],
      "env": { "node": true }
    }
  ]
}