.eslintrc.json

{
	"root": true,

	"extends": "eslint:recommended",

	"parser": "@babel/eslint-parser",
	"parserOptions": {
		"requireConfigFile": false,
		"ecmaVersion": 2017,
		"ecmaFeatures": {
			"legacyDecorators": true
		},
		"sourceType": "module"
	},

	"env": {
		"es6": true,
		"commonjs": true,
		"node": true,
		"browser": true
	},

	"globals": {},

	"rules": {
		"no-empty": "off",
		"no-mixed-spaces-and-tabs": "off",

		"indent": "off",
		"indent-legacy": [ "error", "tab", {
			"SwitchCase": 1
		}],
		"linebreak-style": [ "error", "unix" ],
		"max-len": [ "error", 100, {
			"tabWidth": 4,
			"ignoreUrls": true
		}],
		"no-trailing-spaces": "error",
		"eol-last": "error",

		"block-spacing": [ "error", "always" ],
		"keyword-spacing": [ "error", {
			"before": true,
			"after": true
		}],
		"space-before-blocks": [ "error", "always" ],
		"brace-style": [ "error", "1tbs", {
			"allowSingleLine": true
		}],
		"curly": [ "error", "all" ],
		"guard-for-in": "warn",

		"semi": "error",
		"no-sequences": "error",
		"no-var": "error",
		"no-redeclare": [ "error", { "builtinGlobals": true } ],
		"no-useless-escape": "off",
		"quotes": [ "error", "double" ],
		"prefer-template": "error",
		"comma-style": [ "error", "last" ],
		"comma-dangle": [ "error", "never" ],

		"dot-location": [ "error", "property" ],
		"operator-linebreak": [ "error", "before" ],

		"eqeqeq": "error",
		"max-depth": [ "error", { "max": 4 } ],

		"new-cap": [ "error", {
			"capIsNew": false,
			"properties": false
		}],
		"new-parens": "error",

		"no-console": "error"
	}
}