airbnb eslint + react + prettier + (optional) typescript

.eslintrc.js

/*
  
  # airbnb
  # supports react + hooks
  $ npx install-peerdeps --yarn --dev eslint-config-airbnb
  
  # with prettier
  $ yarn add --dev prettier eslint-config-prettier eslint-plugin-prettier
  
*/

module.exports = {
  env: {
    node: true,
    browser: true,
  },
  extends: [
    'airbnb',
    'airbnb/hooks',
    'prettier/react',
    'plugin:prettier/recommended',
  ],
  rules: {
    'prettier/prettier': 'error',
    'react/jsx-filename-extension': 0,
  },
}


/*
  
  # with typescript
  $ yarn add --dev typescript @typescript-eslint/eslint-plugin @typescript-eslint/parser
  
*/

module.exports = {
  // ...
  parser: '@typescript-eslint/parser',
  extends: [
    // ...
    'plugin:@typescript-eslint/recommended',
  ],
  settings: {
    'import/extensions': ['.js', '.jsx', '.ts', '.tsx'],
    'import/parsers': {
      '@typescript-eslint/parser': ['.ts', '.tsx'],
    },
    'import/resolver': {
      node: {
        extensions: ['.js', '.jsx', '.ts', '.tsx', '.json'],
      },
    },
  },
  rules: {
    // ...

    // allow triple slash comments (eg. declaration files)
    'spaced-comment': ['error', 'always', { markers: ['/'] }],
    
    // fix import errors (https://github.com/benmosher/eslint-plugin-import/issues/1615)
    'import/extensions': [
      'error',
      'ignorePackages',
      {
        js: 'never',
        jsx: 'never',
        ts: 'never',
        tsx: 'never',
      },
    ],
  },
}