.eslintrc.json

{
  "extends": "airbnb",
  "rules": {
    "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."
      }
    ],
    "no-use-before-define": [
      "error", { "functions": false, "classes": true, "variables": true }],
    "max-len": ["warn", 80],
    "no-console": ["off"],
    "no-underscore-dangle": ["warn", {"allow": ["_id"]}],
    "no-param-reassign": ["error", { "props": false }],
    "no-unused-vars": [
      "warn", {"args": "none", "varsIgnorePattern": "^_"}],
    "quote-props" : ["warn", "consistent-as-needed"],
    "no-else-return": ["off"]
  }
}