Error with async: "Parsing error: Unexpected token =>"

• ESLint Version: 3.16.0

• Node Version: 6.9.1

• npm Version: 3.10.8

• parser: default

• configuration

...
"extends": ["eslint:recommended"],
"parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 7,
    "ecmaFeatures": {
        "jsx": true,
        "experimentalObjectRestSpread": true
    }
},
...

source code

!(async () => {
    try {
        const result = await Promise.resolve('Hello');
        console.log('>>>>>', result);
    } catch (error) {
        console.error('Error in demo', error);
    }
})();

eslint check result

error  Parsing error: Unexpected token =>

[not-an-aardvark]

Thanks for the report. Async functions are an ES2017 (or “ES8”) feature, but you have ecmaVersion: 7 in your config. To fix this, you should use ecmaVersion: 8 or ecmaVersion: 2017 in your config.

[not-an-aardvark]

ecmaVersion should not be in ecmaFeatures.

{
    "env": {
        "browser": true,
        "node": true,
        "es6": true
    },
    "extends": ["eslint:recommended", "plugin:react/recommended"],
    "parserOptions": {
+       "ecmaVersion": 8,
        "ecmaFeatures": {
-           "ecmaVersion": 8,
            "experimentalObjectRestSpread": true,
            "jsx": true
        },
        "sourceType": "module"
    },
    "plugins": [
        "react"
    ],
    "rules": {
        "no-console": 0,
        "disallowMultipleVarDecl": 0,
        "maximumLineLength": 0,
        "indent": [
            "error",
            2
        ],
        "linebreak-style": [
            "error",
            "unix"
        ],
        "quotes": [
            "error",
            "single"
        ],
        "semi": [
            "error",
            "always"
        ]
    }
}