.eslintrc

{
  "env": {
    "es6": true,
    "node": true
  },
  "globals": {
    "Promise": true
  },
  "rules": {
    "no-console": [
      "error"
    ],
    "no-constant-condition": [
      "error",
      {
        "checkLoops": false
      }
    ],
    "no-debugger": [
      "error"
    ],
    "no-dupe-args": [
      "error"
    ],
    "no-dupe-keys": [
      "error"
    ],
    "no-duplicate-case": [
      "error"
    ],
    "no-empty-character-class": [
      "error"
    ],
    "no-empty": [
      "error",
      {
        "allowEmptyCatch": true
      }
    ],
    "no-ex-assign": [
      "error"
    ],
    "no-extra-boolean-cast": [
      "error"
    ],
    "no-extra-semi": [
      "error"
    ],
    "no-func-assign": [
      "error"
    ],
    "no-inner-declarations": [
      "error",
      "both"
    ],
    "no-invalid-regexp": [
      "error",
      {
        "allowConstructorFlags": [
          "u",
          "y"
        ]
      }
    ],
    "no-irregular-whitespace": [
      "error"
    ],
    "no-negated-in-lhs": [
      "error"
    ],
    "no-obj-calls": [
      "error"
    ],
    "no-prototype-builtins": [
      "error"
    ],
    "no-regex-spaces": [
      "error"
    ],
    "no-sparse-arrays": [
      "error"
    ],
    "no-unexpected-multiline": [
      "error"
    ],
    "no-unreachable": [
      "error"
    ],
    "use-isnan": [
      "error"
    ],
    "valid-typeof": [
      "error"
    ],
    /* Best Practices: */
    "accessor-pairs": [
      "error"
    ],
    "array-callback-return": [
      "error"
    ],
    "block-scoped-var": [
      "error"
    ],
    "complexity": [
      "error",
      20
    ],
    "default-case": [
      "error"
    ],
    "dot-location": [
      "error",
      "property"
    ],
    "dot-notation": [
      "error"
    ],
    "eqeqeq": [
      "error"
    ],
    "guard-for-in": [
      "error"
    ],
    "no-alert": [
      "error"
    ],
    "no-caller": [
      "error"
    ],
    "no-case-declarations": [
      "error"
    ],
    "no-div-regex": [
      "error"
    ],
    "no-empty-function": [
      "off"
    ],
    "no-empty-pattern": [
      "error"
    ],
    "no-eq-null": [
      "error"
    ],
    "no-eval": [
      "error"
    ],
    "no-extend-native": [
      "error"
    ],
    "no-extra-bind": [
      "error"
    ],
    "no-extra-label": [
      "error"
    ],
    "no-fallthrough": [
      "error"
    ],
    "no-floating-decimal": [
      "error"
    ],
    "no-implicit-coercion": [
      "error",
      {
        "boolean": true,
        "string": true,
        "number": true,
        "allow": [
          "!!"
        ]
      }
    ],
    "no-implicit-globals": [
      "error"
    ],
    "no-implied-eval": [
      "error"
    ],
    "no-invalid-this": [
      "off"
      // because of koa =/
    ],
    "no-iterator": [
      "error"
    ],
    "no-labels": [
      "error"
    ],
    "no-lone-blocks": [
      "off"
    ],
    "no-loop-func": [
      "off"
    ],
    "no-multi-spaces": [
      "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-octal": [
      "error"
    ],
    "no-param-reassign": [
      "off"
      // :'(
    ],
    "no-proto": [
      "error"
    ],
    "no-redeclare": [
      "error"
    ],
    "no-script-url": [
      "error"
    ],
    "no-self-assign": [
      "error"
    ],
    "no-self-compare": [
      "error"
    ],
    "no-sequences": [
      "error"
    ],
    "no-throw-literal": [
      "error"
    ],
    "no-unmodified-loop-condition": [
      "error"
    ],
    "no-unused-labels": [
      "error"
    ],
    "no-useless-call": [
      "error"
    ],
    "no-useless-concat": [
      "error"
    ],
    "no-void": [
      "error"
    ],
    "no-with": [
      "error"
    ],
    "radix": [
      "off"
    ],
    "vars-on-top": [
      "error"
    ],
    "wrap-iife": [
      "error"
    ],
    "yoda": [
      "error"
    ],
    /* Strict Mode: */
    "strict": [
      "error",
      "global"
    ],
    /* Variables: */
    "init-declarations": [
      "off"
    ],
    "no-catch-shadow": [
      "error"
    ],
    "no-delete-var": [
      "error"
    ],
    "no-label-var": [
      "error"
    ],
    "no-restricted-globals": [
      "off"
    ],
    "no-shadow-restricted-names": [
      "error"
    ],
    "no-shadow": [
      "off"
    ],
    "no-undef-init": [
      "error"
    ],
    "no-undef": [
      "error"
    ],
    "no-undefined": [
      "off"
    ],
    "no-unused-vars": [
      "error",
      {
        "vars": "local",
        "args": "none"
      }
    ],
    "no-use-before-define": [
      "error"
    ],
    /* Node.js and CommonJS: */
    "callback-return": [
      "error",
      [
        "callback",
        "cb",
        "next",
        "done"
      ]
    ],
    "global-require": [
      "off"
    ],
    "handle-callback-err": [
      "error"
    ],
    "no-mixed-requires": [
      "error"
    ],
    "no-new-require": [
      "error"
    ],
    "no-path-concat": [
      "error"
    ],
    "no-restricted-modules": [
      "off"
    ],
    "no-sync": [
      "off"
    ],
    /* Stylistic Issues: */
    "array-bracket-spacing": [
      "error",
      "never"
    ],
    "block-spacing": [
      "error",
      "always"
    ],
    "brace-style": [
      "error",
      "1tbs",
      {
        "allowSingleLine": true
      }
    ],
    "camelcase": [
      "error",
      {
        "properties": "never"
      }
    ],
    "comma-dangle": [
      "error",
      "never"
    ],
    "comma-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ],
    "comma-style": [
      "error",
      "last"
    ],
    "computed-property-spacing": [
      "error",
      "never"
    ],
    "consistent-this": [
      "error",
      "self",
      "that"
    ],
    "func-names": [
      "off"
    ],
    "func-style": [
      "error",
      "expression",
      {
        "allowArrowFunctions": true
      }
    ],
    "id-blacklist": [
      "off"
    ],
    "id-length": [
      "error",
      {
        "min": 2,
        "exceptions": [
          "_",
          "$",
          "i",
          "j",
          "k",
          "q"
        ]
      }
    ],
    "id-match": [
      "off"
    ],
    "indent": [
      "error",
      4,
      {
        "SwitchCase": 2
      }
    ],
    "key-spacing": [
      "error",
      {
        "beforeColon": false,
        "afterColon": true,
        "mode": "strict"
      }
    ],
    "keyword-spacing": [
      "error",
      {
        "before": true
      }
    ],
    "linebreak-style": [
      "error",
      "unix"
    ],
    "lines-around-comment": [
      "off"
    ],
    "max-depth": [
      "error",
      {
        "max": 4
      }
    ],
    "max-len": [
      "error",
      {
        "code": 120,
        "ignoreComments": true,
        "ignoreUrls": true,
        "ignorePattern": "(_.)|(log.(warn|error|info))||(new Error\\()"
      }
    ],
    "max-lines": [
      "error",
      {
        "max": 1000,
        "skipComments": true
      }
    ],
    "max-nested-callbacks": [
      "error",
      {
        "max": 5
      }
    ],
    "max-params": [
      "error",
      {
        "max": 4
      }
    ],
    "max-statements-per-line": [
      "error",
      {
        "max": 1
      }
    ],
    "max-statements": [
      "error",
      {
        "max": 100
      },
      {
        "ignoreTopLevelFunctions": true
      }
    ],
    "multiline-ternary": [
      "off"
    ],
    "new-cap": [
      "error",
      {
        "newIsCap": true,
        "capIsNew": false,
        "properties": true
      }
    ],
    "new-parens": [
      "error"
    ],
    "newline-after-var": [
      "off"
    ],
    "newline-before-return": [
      "off"
    ],
    "no-array-constructor": [
      "error"
    ],
    "no-bitwise": [
      "error"
    ],
    "no-continue": [
      "error"
    ],
    "no-inline-comments": [
      "off"
    ],
    "no-lonely-if": [
      "error"
    ],
    "no-mixed-operators": [
      "error"
    ],
    "no-mixed-spaces-and-tabs": [
      "error"
    ],
    "no-multiple-empty-lines": [
      "off"
      // :'(
    ],
    "no-negated-condition": [
      "off"
    ],
    "no-new-object": [
      "error"
    ],
    "no-restricted-syntax": [
      "off"
    ],
    "no-spaced-func": [
      "error"
    ],
    "no-tabs": [
      "error"
    ],
    "no-ternary": [
      "off"
    ],
    "no-trailing-spaces": [
      "error"
    ],
    /*   "no-underscore-dangle": [
         "error",
         {
           "allow" : ["_id"],
           "allowAfterThis": true,
           "allowAfterSuper": true
         }
       ],*/
    "no-unneeded-ternary": [
      "error"
    ],
    "no-whitespace-before-property": [
      "error"
    ],
    "object-curly-newline": [
      "off"
      // https://github.com/eslint/eslint/issues/6488#issuecomment-227383081
    ],
    "object-curly-spacing": [
      "error",
      "always",
      {
        "objectsInObjects": true,
        "arraysInObjects": true
      }
    ],
    "object-property-newline": [
      "off"
    ],
    "one-var-declaration-per-line": [
      "error"
    ],
    "one-var": [
      "error",
      "never"
    ],
    "operator-assignment": [
      "error",
      "always"
    ],
    "quote-props": [
      "error",
      "consistent",
      {
        "unnecessary": false,
        "keywords": true,
        "numbers": true
      }
    ],
    "quotes": [
      "error",
      "single",
      {
        "avoidEscape": true,
        "allowTemplateLiterals": true
      }
    ],
    "require-jsdoc": [
      // TODO Enable some of these?
      "error",
      {
        "require": {
          "FunctionDeclaration": false,
          "MethodDefinition": false,
          "ClassDeclaration": false
        }
      }
    ],
    "semi-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ],
    "semi": [
      "error",
      "always"
    ],
    "sort-vars": [
      "off"
    ],
    "space-before-blocks": [
      "error",
      {
        "functions": "always",
        "keywords": "always",
        "classes": "always"
      }
    ],
    "space-before-function-paren": [
      "error",
      {
        "anonymous": "always",
        "named": "never"
      }
    ],
    "space-in-parens": [
      "error",
      "never"
    ],
    "space-infix-ops": [
      "error"
    ],
    "space-unary-ops": [
      "error",
      {
        "words": true,
        "nonwords": false
      }
    ],
    "spaced-comment": [
      "error",
      "always",
      {
        "exceptions": [
          "-"
        ]
      }
    ],
    "unicode-bom": [
      "error",
      "never"
    ],
    "wrap-regex": [
      "off"
    ],
    "arrow-body-style": [
      // TODO Unsure about this rule...
      "off"
    ],
    "arrow-parens": [
      // TODO Unsure about this rule...
      "error",
      "as-needed"
    ],
    "arrow-spacing": [
      "error",
      {
        "before": true,
        "after": true
      }
    ],
    "constructor-super": [
      "error"
    ],
    "generator-star-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ],
    "no-class-assign": [
      "error"
    ],
    "no-confusing-arrow": [
      "error",
      {
        "allowParens": false
      }
    ],
    "no-const-assign": [
      "error"
    ],
    "no-dupe-class-members": [
      "error"
    ],
    "no-duplicate-imports": [
      "error",
      {
        "includeExports": true
      }
    ],
    "no-new-symbol": [
      "error"
    ],
    "no-restricted-imports": [
      "off"
    ],
    "no-this-before-super": [
      "error"
    ],
    "no-useless-computed-key": [
      "error"
    ],
    "no-useless-constructor": [
      "off"
    ],
    "no-useless-rename": [
      "error"
    ],
    "no-var": [
      "error"
    ],
    "object-shorthand": [
      "error",
      "always",
      {
        "avoidQuotes": true
      }
    ],
    "prefer-arrow-callback": [
      "error"
    ],
    "prefer-const": [
      "error"
    ],
    "prefer-reflect": [
      // TODO Unsure about this rule...
      "off"
    ],
    "prefer-rest-params": [
      // TODO Unsure about this rule...
      "off"
    ],
    "prefer-spread": [
      "error"
    ],
    "prefer-template": [
      "error"
    ],
    "require-yield": [
      "off"
    ],
    "rest-spread-spacing": [
      "error",
      "never"
    ],
    "template-curly-spacing": [
      "error",
      "never"
    ],
    "yield-star-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ]
  }
}