.eslintrc

{
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module"
  },
  "env": {
    "node": true,
    "es6": true
  },
  "rules": {
    "strict": [2, "global"],

    "no-var": 0,
    "prefer-const": 0,

    // variables
    "no-shadow": [2, {
      "builtinGlobals": true
    }],
    "no-shadow-restricted-names": 2,
    "no-unused-vars": [2, {
      "vars": "all",
      "args": "after-used"
    }],
    "no-use-before-define": [2, {
      "functions": false
    }],

    // expressions
    "no-unused-expressions": 2,

    // possible errors
    "comma-dangle": [2, "always-multiline"],
    "no-cond-assign": [2, "except-parens"],
    "no-console": [2, {
      "allow": ["error", "warn", "info", "dir"]
    }],
    "no-debugger": 2,
    "no-alert": 1,
    "no-constant-condition": 2,
    "no-dupe-keys": 2,
    "no-duplicate-case": 2,
    "no-empty": 2,
    "no-ex-assign": 2,
    "no-extra-boolean-cast": 2,
    "no-extra-semi": 2,
    "no-func-assign": 2,
    "no-inner-declarations": 2,
    "no-invalid-regexp": 2,
    "no-irregular-whitespace": 2,
    "no-obj-calls": 2,
    "no-reserved-keys": 0,
    "no-sparse-arrays": 2,
    "no-unreachable": 2,
    "use-isnan": 2,
    "block-scoped-var": 2,

    // best practices
    "consistent-return": 2,
    "curly": [2, "all"],
    "default-case": 0,
    "dot-notation": [2, {
      "allowKeywords": true
    }],
    "eqeqeq": 0,
    "guard-for-in": 2,
    "no-caller": 2,
    "no-else-return": 2,
    "no-eq-null": 0,
    "no-eval": 2,
    "no-extend-native": 2,
    "no-extra-bind": 2,
    "no-fallthrough": 2,
    "no-floating-decimal": 2,
    "no-implied-eval": 2,
    "no-lone-blocks": 2,
    "no-loop-func": 2,
    "no-multi-str": 2,
    "no-native-reassign": 2,
    "no-new": 2,
    "no-new-func": 2,
    "no-new-wrappers": 2,
    "no-octal": 2,
    "no-octal-escape": 2,
    "no-param-reassign": 2,
    "no-proto": 2,
    "no-redeclare": 2,
    "no-return-assign": [2, "except-parens"],
    "no-script-url": 2,
    "no-self-compare": 2,
    "no-sequences": 2,
    "no-throw-literal": 2,
    "no-with": 2,
    "radix": 2,
    "vars-on-top": 2,
    "wrap-iife": [2, "inside"],
    "yoda": 2,

    // style
    "indent": [2, 2],
    "brace-style": [2, "1tbs", {
      "allowSingleLine": true
    }],
    "quotes": [2, "single"],
    "camelcase": [2, {
    "properties": "always"
    }],
    "comma-spacing": [2, {
      "before": false,
      "after": true
    }],
    "comma-style": [2, "last"],
    "eol-last": 2,
    "func-names": 2,
    "key-spacing": [2, {
        "beforeColon": false,
        "afterColon": true
    }],
    "new-cap": [2, {
      "newIsCap": true
    }],
    "no-multiple-empty-lines": [2, {
      "max": 1
    }],
    "no-nested-ternary": 2,
    "no-new-object": 2,
    "no-spaced-func": 2,
    "no-trailing-spaces": 2,
    "no-extra-parens": [2, "all", {
      "conditionalAssign": false
    }],
    "no-underscore-dangle": 0,
    "one-var": [2, "never"],
    "padded-blocks": [2, "never"],
    "semi": [2, "always"],
    "semi-spacing": [2, {
      "before": false,
      "after": true
    }],
    "keyword-spacing": [2, {
      "before": true,
      "after": true
    }],
    "space-before-blocks": 2,
    "space-before-function-paren": [2, "never"],
    "space-infix-ops": 2,
    "spaced-comment": [2, "always"],
  }
}