.eslintrc

{
  "parserOptions": {
    "ecmaVersion": 12,
    "sourceType": "module",
    "requireConfigFile": false,
    "babelOptions": {
      "plugins": ["@babel/plugin-syntax-class-properties"]
    }
  },
  "parser": "@babel/eslint-parser",
  "env": {
    "es6": true,
    "node": true,
    "jest": true
  },
  "extends": ["eslint:recommended"],
  "rules": {
    "no-console": "warn",
    "indent": [
      "error",
      2,
      {
        "SwitchCase": 1
      }
    ],
    "quotes": ["error", "single"],
    "semi": ["error", "always"],
    "space-in-parens": ["error"],
    "space-infix-ops": "error",
    "object-curly-spacing": ["error", "always"],
    "comma-spacing": "error",
    "eol-last": ["error", "always"],
    "arrow-spacing": ["error", { "before": true, "after": true }],
    "array-bracket-spacing": "error",
    "prefer-const": "error",
    "no-var": "error",
    "rest-spread-spacing": "error",
    "prefer-arrow-callback": "error",
    "object-shorthand": ["error", "always"]
  }
}