.eslintrc.js

// eslint-disable-next-line no-undef
module.exports = {
  root: true,
  parserOptions: {
    ecmaVersion: 2020,
    sourceType: 'module',
    ecmaFeatures: {
      jsx: true
    }
  },
  env: {
    browser: true
  },
  extends: [
    'eslint:recommended',
    'plugin:react/recommended',
    'plugin:eslint-comments/recommended'
  ],
  rules: {
    'react/react-in-jsx-scope': 'off',
    'react/prop-types': 'off',
    'space-in-parens': [ 'error', 'always' ],
    'array-bracket-spacing': [ 'error', 'always' ],
    'object-curly-spacing': [ 'error', 'always' ],
    'space-before-blocks': [ 'error', 'always' ],
    'space-infix-ops': 'error',
    'space-unary-ops': [
      'error',
      {
        words: true,
        nonwords: false,
        overrides: {
          '!': true,
          '++': false,
          '--': false
        }
      }
    ]
  },
  settings: {
    react: {
      version: 'detect'
    }
  }
}