.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 2017
  },
  "env": {
    "es6": true,
    "browser": true,
    "commonjs": true,
    "node": true
  },
  "extends": [
    "eslint:recommended",
    "prettier",
    "react-app",
    "react-app/jest",
    "prettier/@typescript-eslint",
    "prettier/babel",
    "prettier/flowtype",
    "prettier/prettier",
    "prettier/react",
    "prettier/standard"
  ],
  "plugins": ["prettier"],
  "rules": {
    "array-callback-return": "error",
    "camelcase": "error",
    "curly": "error",
    "dot-notation": "error",
    "eqeqeq": "error",
    "implicit-arrow-linebreak": ["error", "beside"],
    "indent": ["error", 2],
    "no-duplicate-case": "error",
    "no-else-return": "error",
    "no-empty": "error",
    "no-empty-function": "error",
    "no-extra-semi": "error",
    "no-func-assign": "error",
    "no-irregular-whitespace": "error",
    "no-multi-spaces": "error",
    "no-unreachable": "error",
    "no-unused-vars": "error",
    "no-var": "error",
    "prefer-arrow-callback": "error",
    "prefer-const": "error",
    "prettier/prettier": [
      "error",
      {
        "endOfLine": "auto"
      }
    ],
    "quotes": ["error", "double"],
    "semi": ["error", "always"],
    "vars-on-top": "error",
    "yoda": "error"
  }
}