.eslintrc.json

{
  "extends": "eslint:recommended",
  "env": {
    "node": true,
    "es6": true,
    "jest/globals": true
  },
  "parserOptions": {
    "ecmaVersion": 2020
  },
  "plugins": [
    "jest"
  ],
  "rules": {
    "brace-style": [
      "error",
      "stroustrup",
      {
        "allowSingleLine": true
      }
    ],
    "comma-dangle": [
      "error",
      "always-multiline"
    ],
    "comma-spacing": "error",
    "comma-style": "error",
    "curly": [
      "error",
      "multi-line",
      "consistent"
    ],
    "dot-location": [
      "error",
      "property"
    ],
    "handle-callback-err": "off",
    "indent": [
      "error",
      2,
      {
        "SwitchCase": 1
      }
    ],
    "max-nested-callbacks": [
      "error",
      {
        "max": 4
      }
    ],
    "max-statements-per-line": [
      "error",
      {
        "max": 2
      }
    ],
    "no-console": "off",
    "no-empty-function": "error",
    "no-floating-decimal": "error",
    "no-inline-comments": "error",
    "no-lonely-if": "error",
    "no-multi-spaces": "error",
    "no-multiple-empty-lines": [
      "error",
      {
        "max": 2,
        "maxEOF": 1,
        "maxBOF": 0
      }
    ],
    "no-shadow": [
      "error",
      {
        "allow": [
          "err",
          "resolve",
          "reject"
        ]
      }
    ],
    "no-trailing-spaces": [
      "error"
    ],
    "no-var": "error",
    "object-curly-spacing": [
      "error",
      "always"
    ],
    "prefer-const": "error",
    "quotes": [
      "error",
      "double"
    ],
    "semi": [
      "error",
      "always"
    ],
    "space-before-blocks": "error",
    "space-before-function-paren": [
      "error",
      {
        "anonymous": "never",
        "named": "never",
        "asyncArrow": "always"
      }
    ],
    "space-in-parens": "error",
    "space-infix-ops": "error",
    "space-unary-ops": "error",
    "spaced-comment": "error",
    "no-unused-vars": "warn",
    "yoda": "error",
    "keyword-spacing": "error"
  }
}