.eslintrc.json

{
  "env": {
    "browser": true,
    "es6": true,
    "jest": true
  },
  "extends": ["eslint:recommended"],
  "globals": {
    "Atomics": "readonly",
    "SharedArrayBuffer": "readonly"
  },
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module"
  },
  "rules": {
    "arrow-body-style": "error",
    "no-console": "error",
    "no-else-return": ["error", { "allowElseIf": false }],
    "no-plusplus": "error",
    "no-unused-expressions": "error",
    "no-unused-vars": ["error", { "ignoreRestSiblings": true }],
    "no-var": "error",
    "padding-line-between-statements": [
      "error",
      { "blankLine": "always", "prev": "*", "next": "return" },
      { "blankLine": "always", "prev": ["const", "let", "var", "directive", "if", "break"], "next": "*" },
      { "blankLine": "any", "prev": ["const", "let", "var"], "next": ["const", "let", "var"] },
      { "blankLine": "any", "prev": "directive", "next": "directive" }
    ],
    "prefer-const": "error",
    "prefer-template": "error",
    "quote-props": "off",
    "quotes": "off"
  }
}