eslint: error Parsing error: The keyword ‘const’ is reserved

I am getting this error from ESLint:

error  Parsing error: The keyword 'const' is reserved

from this code:

const express = require('express');
const app = express();
const _ = require('underscore');

I’ve tried removing node_modules and reinstalling all npm packages (as suggested here), but to no avail.

Answer

ESLint defaults to ES5 syntax-checking.
You’ll want to override to the latest well-supported version of JavaScript.

Try adding a .eslintrc.json file to your project. Inside it:

{
    "parserOptions": {
        "ecmaVersion": "latest"
    },

    "env": {
        "es6": true
    }
}

Hopefully this helps.

EDIT: I also found this example .eslintrc.json which might help.