.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 2017
  },
  "env": {
    "es6": true,
    "node": true
  },
  "extends": "eslint:recommended",
  "rules": {
    "no-console": "off",
    "indent": [
      "error",
      2,
      {
        "SwitchCase": 1
      }
    ],
    "quotes": [
      "warn",
      "single"
    ],
    "semi": [
      "warn",
      "always"
    ],
    "keyword-spacing": [
      "error", {
        "before": true,
        "after": true
      }
    ],
    "space-before-blocks": [
      "error", {
        "functions":"always",
        "keywords": "always",
        "classes": "always"
      }
    ],
    "space-before-function-paren": [
      "error", {
        "anonymous": "never",
        "named": "never",
        "asyncArrow": "always"
      }
    ],
    "prefer-const": [
      "error", {
        "destructuring": "any",
        "ignoreReadBeforeAssign": false
      }
    ],
    "no-undef": [
      "error"
    ],
    "no-cond-assign": [
      "error"
    ],
    "no-constant-condition": [
      "error"
    ],
    "no-unused-vars": [
      "warn"
    ],
    "no-useless-escape": [
      "error"
    ],
    "no-redeclare": [
      "error"
    ],
    "no-inner-declarations": [
      "warn"
    ],
    "consistent-return": [
      "error"
    ],
    "no-useless-return": [
      "error"
    ]
  }
}