Instalação do ESLint

$ yarn add eslint -D

Inicialização

$ yarn eslint --init

Answers:

? How would you like to use ESLint? **To check syntax, find problems, and enforce code style**
? What type of modules does your project use? **JavaScript modules (import/export)**
? Which framework does your project use? **React**
? Does your project use TypeScript? **No**
? Where does your code run? **Browser**
? How would you like to define a style for your project? **Use a popular style guide**
? Which style guide do you want to follow? **Airbnb: https://github.com/airbnb/javascript**
? What format do you want your config file to be in? **JavaScript**

Dependências e Prettier

$ yarn add prettier eslint-config-prettier eslint-plugin-prettier babel-eslint -D

Arquivo .eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true,
  },
  extends: [
    'plugin:react/recommended',
    'airbnb',
    'prettier',
    'prettier/react',
  ],
  globals: {
    Atomics: 'readonly',
    SharedArrayBuffer: 'readonly',
  },
  parser: 'babel-eslint',
  parserOptions: {
    ecmaFeatures: {
      jsx: true,
    },
    ecmaVersion: 2018,
    sourceType: 'module',
  },
  plugins: [
    'react',
    'prettier',
  ],
  rules: {
    'prettier/prettier': 'error',
    'react/jsx-filename-extension': [
      'warn',
      { extensions: ['.jsx', '.js'] }
    ],
    'import/prefer-default-export': 'off'
  },
};

Arquivo .prettierrc

{
  "singleQuote": true,
  "trailingComma": "es5"
}

EditorConfig

Arquivo .editorconfig

root = true

[*]
end_of_line = lf
indent_style = space
indent_size = 2
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true