.eslintrc.json

{
  "env": {
    "browser": true,
    "es2021": true,
    "node": true
  },
  "extends": [
    "react-app",
    "react-app/jest",
    "eslint:recommended",
    "plugin:react/recommended"
  ],
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "ecmaVersion": "latest",
    "sourceType": "module",
    "requireConfigFile": false
  },
  "plugins": [
    "react"
  ],
  "rules": {
    "quotes": ["error", "single"],
    "semi": ["error", "always"],
    "indent": ["error", 2],
    "no-undef": ["error", { "typeof": true }],
    "no-unused-vars": ["warn"],
    "no-empty": ["warn"],
    "no-prototype-builtins": ["off"],
    "no-fallthrough": ["warn"],
    "no-cond-assign": ["warn"],
    "getter-return": ["warn"],
    "valid-typeof": ["warn"],
    "no-case-declarations": ["warn"],
    "no-async-promise-executor": ["warn"],
    "no-sparse-arrays": ["warn"],
    "no-control-regex": ["warn"],
    "no-useless-escape": ["warn"]
  },
  "globals": {
    "process": "readonly",
    "__REACT_DEVTOOLS_GLOBAL_HOOK__": "readonly",
    "chrome": "readonly",
    "browser": "readonly",
    "gapi": "readonly",
    "Buffer": "readonly",
    "SuppressedError": "readonly",
    "setImmediate": "readonly",
    "global": "readonly"
  },
  "ignorePatterns": ["build/**"]
}