.eslintrc.json

{
  "env": {
    "node": true,
    "commonjs": true,
    "es6": true,
    "jest": true
  },
  "extends": "eslint:recommended",
  "globals": {
    "Atomics": "readonly",
    "SharedArrayBuffer": "readonly"
  },
  "parserOptions": {
    "ecmaVersion": 2018
  },
  "rules": {
    "comma-spacing": [
      2,
      {
        "before": false,
        "after": true
      }
    ],
    "linebreak-style": [
      "error",
      "unix"
    ],
    "quotes": [
      "error",
      "single"
    ],
    "semi": [
      "error",
      "always"
    ],
    "no-console": "off",
    "no-var": 1,
    "no-case-declarations": 0,
    "semi-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ],
    "max-len": [
      "error",
      {
        "code": 90
      }
    ],
    "indent": [
      "error",
      4
    ],
    "no-lonely-if": "error",
    "no-multiple-empty-lines": [
      "error",
      {
        "max": 1
      }
    ],
    "func-style": [
      "error",
      "declaration",
      {
        "allowArrowFunctions": true
      }
    ],
    "require-await": "error",
    "prefer-arrow-callback": "error"
  }
}