.eslintrc

{
  "parserOptions": {
    "sourceType": "module",
    "ecmaFeatures": {
      "impliedStrict": true
    },
    "ecmaVersion": "2021"
  },
  "plugins": ["jest", "node", "prettier"],
  "extends": [
    "eslint:recommended",
    "airbnb-base",
    "plugin:node/recommended",
    "plugin:jest/recommended",
    "plugin:jest/style",
    "prettier",
    "plugin:prettier/recommended"
  ],
  "env": {
    "es2020": true,
    "jest/globals": true,
    "node": true
  },
  "rules": {
    /////////////////////////////////////////  Our rules  /////////////////////////////////////////
    "no-eq-null": "error",

    /////////////////////////////////////////  Overrides   ////////////////////////////////////////
    "prettier/prettier": "warn",
    "no-console": "off",
    "class-methods-use-this": "off",
    "no-continue": "off",
    // Overwrites airbnb-base because our Node version doesn't allow to use private properies syntax yet, so we use underscores
    "no-underscore-dangle": ["error", { "allowAfterThis": true }],
    // Overwrites airbnb-base to allow for..of:
    "no-restricted-syntax": [
      "error",
      {
        "selector": "ForInStatement",
        "message": "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array."
      },
      {
        "selector": "LabeledStatement",
        "message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand."
      },
      {
        "selector": "WithStatement",
        "message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize."
      }
    ],
    // Overwrites airbnb-base because woks badly with prettier making multyline strings ugly
    "prefer-template": "off",
    "import/extensions": "off"
  }
}