.eslintrc.json

{
  "env": {
    "browser": true,
    "commonjs": true,
    "es6": true,
    "node": true
  },
  "extends": [
    "eslint:recommended"
  ],
  "globals": {
    "jest": true
  },
  "parserOptions": {
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true
    },
    "ecmaVersion": 9,
    "sourceType": "module"
  },
  "rules": {
    "eqeqeq": [
      "error",
      "always"
    ],
    "keyword-spacing": [
      "error",
      {
        "before": true,
        "after": true
      }
    ],
    "no-console": "off",
    "no-irregular-whitespace": "error",
    "no-var": "error",
    "padding-line-between-statements": [
      "error",
      {
        "blankLine": "always",
        "prev": "*",
        "next": ["block-like", "function", "return"]
      },
      {
        "blankLine": "always",
        "prev": ["const", "let", "var"],
        "next": "*"
      },
      {
        "blankLine": "any",
        "prev": ["const", "let", "var"],
        "next": ["const", "let", "var"]
      }
    ],
    "prefer-const": "error",
    "sort-keys": "error",
    "sort-vars": [
      "error",
      {
        "ignoreCase": true
      }
    ]
  }
}