.eslintrc.json

{
    "root": true,
    "rules": {
        "indent": [ 2, "tab", { "SwitchCase": 1 } ],
        "linebreak-style": [ 2, "unix" ],
        "semi": [ 2, "always" ],
        "keyword-spacing": [ 2, { "before": true, "after": true } ],
        "space-before-blocks": [ 2, "always" ],
        "space-in-parens": [ 2, "never" ],
        "no-mixed-spaces-and-tabs": [ 2, "smart-tabs" ],
        "no-cond-assign": [ 0 ],
        "prefer-const": 2,
        "no-var": 2
    },
    "env": {
        "es6": true,
        "node": true
    },
    "extends": "eslint:recommended",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module"
    },
    "overrides": [
      {
        "files": ["register.js"],
        "rules": {
          "no-console": [ 0 ],
          "no-var": [ 0 ]
        }
      }
    ]
}