.eslintrc.json

{
    "env": {
        "commonjs": true,
        "es6": true,
        "node": true,
        "mocha": true
    },
    "extends": "eslint:recommended",
    "globals": {
        "Atomics": "readonly",
        "SharedArrayBuffer": "readonly"
    },
    "parserOptions": {
        "ecmaVersion": 2018,
        "sourceType": "module"
    },
    "rules": {
        // rules that cause errors
        "no-var": "error",
        // rules that cause warnings
        "array-bracket-spacing": ["warn", "never"],
        "array-bracket-newline": ["warn", "consistent"],
        "eol-last": ["warn", "always"],
        "indent": ["warn", 2],
        "no-fallthrough": "warn",
        "no-prototype-builtins": "off",
        "no-trailing-spaces": ["warn", { "ignoreComments": true }],
        "no-unused-vars": ["warn"],
        "object-curly-spacing": ["warn", "always"],
        "padded-blocks": ["warn", "never"],
        "quotes": ["warn", "double"],
        "semi": ["warn", "always"],
        "space-in-parens": ["warn", "never"],
        "object-property-newline": ["warn", {}],
        "object-curly-newline": ["warn", "always"],
        "eqeqeq": ["warn", "always"]
    },
    "overrides": [{
        "files": ["scripts/initlocal.js"],
        "parserOptions": {
            "ecmaVersion": 2020,
            "sourceType": "module"
        }
    }]
}