.eslintrc.js

module.exports = {
    root : true,
    "env": {
        "browser": true,
        "es2018": true,
        "jquery": true //https://stackoverflow.com/a/39511584/1410592
    },
    "extends": "eslint:recommended",
    "overrides": [
        {
            "env": {
                "node": true
            },
            "files": [
                ".eslintrc.{js,cjs}"
            ],
            "parserOptions": {
                "sourceType": "script"
            }
        }
    ],
    "parserOptions": {
        "ecmaVersion": "latest",
        "sourceType": "module"
    },
    "rules": {
        "indent": [
            "error",
            4
        ],
        "linebreak-style": [
            "error",
            "unix"
        ],
        "quotes": [
            "error",
            "single"
        ],
        "semi": [
            "error",
            "always"
        ]
    }
};