Promise' is not defined. (no-undef)

• ESLint Version: 4.14.0
• Node Version: 6.11.1
• npm Version: 5.3.0

What parser (default, Babel-ESLint, etc.) are you using? default

const promise = new Promise((resolve, reject) => {});

eslint config

{
	"env": {
		"browser": true,
		"node": true
	},
	"parserOptions": {
		"ecmaVersion": 6,
		"sourceType": "script"
	},
	"extends": ["kentcdodds/possible-errors", "kentcdodds/best-practices"],
	"rules": {
		"global-require": "off"
	}
}

What did you expect to happen? No un-def error for es6 globals (Promise)

What actually happened? Throws un-def error for ‘Promise’

[j-f1]

Do you have es6: true set under the env key in your ESLint config?

[platinumazure]

@bharathvaj1995 ecmaVersion only affects the parser, so it allows ES6 syntax (such as let/const). The environment will set ecmaVersion for you, but will also enable all of the ES6 globals (such as Promise, Map, Set). If you want ES7 (or later) and ES6 globals, you would do env es6:true and ecmaVersion: (something greater than 6)… Hope that makes sense!