.eslintrc.json

{
    "env": {
        "browser": true,
        "es6": true,
        "node": true,
        "jest/globals": true
    },
    "extends": "eslint:recommended",
    "globals": {
        "Atomics": "readonly",
        "SharedArrayBuffer": "readonly"
    },
    "parser": "babel-eslint",
    "parserOptions": {
        "ecmaVersion": 2018,
        "sourceType": "module"
    },
    "plugins": ["jest"],
    "rules": {
        "indent": [
            "error",
            2
        ],
        "linebreak-style": [
            "error",
            "unix"
        ],
        "quotes": [
            "error",
            "single"
        ],
        "semi": [
            "error",
            "always"
        ],
        "space-before-function-paren": [
            "error",
            {
                "anonymous": "never",
                "named": "never",
                "asyncArrow": "always"
            }
        ],
        "space-in-parens": [
            "error",
            "never"
        ]
    }
}