.eslintrc.json

{
    "root": true,
    "rules": {
        "indent": [ 2, "tab", { "SwitchCase": 1 } ],
        "semi": [ 2, "always" ],
        "space-before-blocks": [ 2, "always" ],
        "no-mixed-spaces-and-tabs": [ 2, "smart-tabs" ],
        "no-cond-assign": 0,
        "no-unused-vars": 2,
        "object-shorthand":  [ 2, "always" ],
        "no-const-assign": 2,
        "no-class-assign": 2,
        "no-this-before-super": 2,
        "no-var": 2,
        "no-unreachable": 2,
        "valid-typeof": 2,
        "quote-props": [ 2, "as-needed" ],
        "one-var": [ 2, "never" ],
        "prefer-arrow-callback": 2,
        "prefer-const": [ 2, { "destructuring": "all" } ],
        "arrow-spacing": 2,
        "no-inner-declarations": 0
    },
    "env": {
        "es6": true,
        "browser": true,
        "node": true,
        "mocha": true
    },
    "extends": [
        "eslint:recommended",
        "plugin:import/errors",
        "plugin:import/warnings"
    ],
    "parserOptions": {
        "ecmaVersion": 8,
        "sourceType": "module"
    }
}