.eslintrc.json

{
  "env": {
    "node"    : true,
    "mocha"   : true,
    "es6"     : true,
    "browser" : true
  },
  "extends": "eslint:recommended",
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 8
  },
  "rules": {
    "indent": [
      "error",
      2
    ],
    "linebreak-style": [
      "error",
      "unix"
    ],
    "quotes": [
      "error",
      "single",
      "avoid-escape"
    ],
    "semi": [
      "error",
      "always"
    ],
    "camelcase" : ["warn", {
      "properties" : "always"
    }],
    "key-spacing": ["error", {
        "singleLine" : {
          "beforeColon": true,
          "afterColon": true
        },
        "multiLine" : {
          "beforeColon": true,
          "afterColon" : true,
          "align"      : "colon"
        }
      }],
    "eqeqeq"          : "error",
    "block-scoped-var": "error",
    "complexity"      : "warn",
    "curly": "error",
    "default-case": "error",
    "dot-location": ["error", "property"],
    "guard-for-in": "error",
    "no-eval": "error",
    "block-spacing": "error",
    "comma-spacing": ["error", {
      "before" : false,
      "after"  : true
    }],
    "id-length": ["error", {
      "min": 2,
      //"max": 16, // 最大文字列長なし。
      "properties": "never",
      "exceptions": []   //除外変数名
    }],
    "space-before-function-paren": [
      "error",
      "never"
    ],
    "space-before-blocks": "error",
    "prefer-const": "error",
    "no-var": "error",
    "arrow-spacing": "error",
    "no-warning-comments": ["warn", {
      "terms": [
        "todo",
        "fixme",
        "hack"
      ],
      "location": "anywhere"
    }],
    "no-console": "off"
  }
}