.eslintrc.json

{
    "extends": "eslint:recommended",
    "env": {
        "es2019": true,
        "node": true
    },
    "parserOptions": {
        "ecmaVersion": 2019,
        "sourceType": "script"
    },
    "rules": {
        "semi": ["error", "always"],
        "quotes": ["error", "single"],
        "eqeqeq": ["error", "always", { "null": "ignore" }],
        "guard-for-in": ["error"],
        "no-extend-native": ["error"],
        "wrap-iife": ["error"],
        "indent": ["error", 4],
        "no-use-before-define": ["error", { "functions": false }],
        "new-cap": ["error"],
        "no-caller": ["error"],
        "strict": ["error"],
        "no-trailing-spaces": ["error"],
        "max-params": ["error", 10],
        "max-depth": ["error", 5],
        "max-statements": ["error", 25],
        "max-len": ["error", 110],
        "no-var": ["error"],
        // Allow unused vars if prefixed with "_"
        "no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
        "no-multi-str": ["error"],
        "camelcase": ["error"],
        "space-unary-ops": ["error"],
        "comma-spacing": ["error"],
        "eol-last": ["error"],
        "space-before-blocks": ["error", "always"],
        "keyword-spacing": ["error"],
        "linebreak-style": ["error", "unix"],
        "no-confusing-arrow": ["error"],
        "object-curly-spacing": ["error", "always"]
    },
    "overrides": [
        {
            "files": ["test/**/*.js"],
            "env": {
                "mocha": true
            }
        }
      ]
}