.eslintrc.json

{
  "env": {
    "browser": true,
    "es6": true
  },
  "extends": [
    "react-app",
    "react-app/jest",
    "eslint:recommended"
  ],
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "jsx": true
    },
    "sourceType": "module",
    "babelOptions": {
      "presets": [
        ["babel-preset-react-app", false],
        "babel-preset-react-app/prod"
      ]
    }
  },
  "plugins": [
    "react",
    "jsx-a11y"
  ],
  "rules": {
    "indent": [
      "warn",
      2,
      { "SwitchCase": 1 }
    ],
    "linebreak-style": [
      "warn",
      "unix"
    ],
    "quotes": [
      "warn",
      "single"
    ],
    "semi": [
      "warn",
      "always",
      {
        "omitLastInOneLineClassBody": true
      }
    ],

    "no-case-declarations": "warn",
    "no-cond-assign": "warn",
    "no-redeclare": "warn",
    "no-unreachable": "warn",
    "no-class-assign": "warn",
    "no-unused-vars": "warn",
    "no-irregular-whitespace": "warn",
    "no-console": "warn",
    "no-useless-escape": "warn",

    "react/jsx-indent": ["warn", 2],
    "react/prop-types": "warn",
    "react/display-name": "warn",

    "eqeqeq": "off",
    "jsx-a11y/anchor-has-content": "off",
    "jsx-a11y/href-no-hash": "off"
  }
}