.eslintrc + jsconfig

.eslintrc

{
	"env": {
		"browser": true,
		"commonjs": true,
		"es6": true,
		"node": true
	},
	"parser": "babel-eslint",
	"parserOptions": {
		"ecmaVersion": 7,
		"ecmaFeatures": {
			"jsx": true,
			"experimentalObjectRestSpread": true,
			"experimentalDecorators": true
		},
		"sourceType": "module"
	},
	"rules": {
		"no-const-assign": "warn",
		"no-this-before-super": "warn",
		"no-undef": "warn",
		"no-unreachable": "warn",
		"no-unused-vars": "warn",
		"constructor-super": "warn",
		"valid-typeof": "warn",
		"strict" : 0
	}
}

jsconfig.json

{
    "compilerOptions": {
        "experimentalDecorators": true
    }
  }