.eslintrc.json

{
  "env": {
    "es6": true,
    "browser": true,
    "node": true,
    "jest": true
  },
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "sourceType": "script",
    "requireConfigFile": false,
    "ecmaFeatures": {
      "globalReturn": false
    }
  },
  "extends": ["eslint:recommended", "prettier"],
  "rules": {
    "no-console": "off",
    "no-mixed-spaces-and-tabs": "warn",
    "no-unused-vars": "off",
    "no-use-before-define": "off",
    "prefer-const": "off",
    "no-undef": "off",
    "no-redeclare": "off",
    "indent": ["warn", 4, { "SwitchCase": 1 }],
    "quotes": ["warn", "double", { "avoidEscape": true }],
    "semi": "error",
    "no-trailing-spaces": ["warn", { "skipBlankLines": true, "ignoreComments": true }],
    "no-duplicate-case": "error",
    "no-irregular-whitespace": "warn",
    "no-prototype-builtins" : "off",
    "no-useless-escape" : "off",
    "no-inner-declarations" : "off",
    "no-constant-assign" : "off",
    "no-const-assign" : "off",
    "no-dupe-keys" : "off",
    "no-useless-catch" : "off"
  }
}