.eslintrc.json

{
  "env": {
    "browser": false,
    "commonjs": true,
    "es6": true,
    "node": true,
    "mocha": true
  },
  "parserOptions": {
    "ecmaVersion": 2018,
    "ecmaFeatures": {
      "jsx": true
    },
    "sourceType": "module"
  },
  "rules": {
    "no-const-assign": "warn",
    "no-this-before-super": "warn",
    "no-undef": "warn",
    "no-unreachable": "warn",
    "no-unused-vars": "warn",
    "constructor-super": "warn",
    "valid-typeof": "warn",
    "no-console": "warn",
    "no-debugger": "warn",
    "no-extra-semi": "warn",
    "no-irregular-whitespace": "warn",
    "no-unsafe-finally": "warn",
    "no-unused-labels": "warn",
    "no-var": "warn",
    "prefer-const": "warn",
    "no-constant-condition": "warn",
    "no-dupe-args": "warn",
    "no-dupe-class-members": "warn",
    "no-dupe-keys": "warn",
    "no-empty": "warn",
    "no-empty-character-class": "warn",
    "no-ex-assign": "warn",
    "no-func-assign": "warn"
  },
  "extends": ["eslint:recommended", "plugin:react/recommended"],
  "plugins": ["react"],
  "settings": {
    "react": {
      "version": "detect"
    }
  }
}