.eslintrc.json

{
    "env": {
        "es2021": true,
        "node": true
    },
    "extends": ["eslint:recommended"],
    "parserOptions": {
        "ecmaVersion": 12,
        "sourceType": "module"
    },
    "plugins": [
        "header"
    ],
    "rules": {
        "header/header": [2, "line", [
            " Copyright (c) WarnerMedia Direct, LLC. All rights reserved. Licensed under the MIT license.",
            " See the LICENSE file for license information.",
            "",
            " Copyright 2012-2015, Yahoo Inc.",
            " Copyrights licensed under the New BSD License. See the accompanying ThirdPartyNotices.txt file for terms."
        ]]
    },
    "overrides": [
        {
            "files": ["__tests__/**/*.js"],
            "env": {
                "jest": true
            }
        },
        {
            "files": ["assets/**/*.js"],
            "env": {
                "node": false,
                "browser": true
            }
        }
    ]
}