.eslintrc.js

module.exports = {
  parser: '@typescript-eslint/parser',
  env: {
    browser: true,
    es2021: true,
    node: true,
    jest: true
  },
  extends: ['plugin:prettier/recommended'],
  parserOptions: {
    ecmaVersion: 'latest',
    sourceType: 'module'
  },
  rules: {
    'no-unused-vars': [
      'error',
      // we are only using this rule to check for unused arguments since TS
      // catches unused variables but not args.
      { varsIgnorePattern: '.*', args: 'none' }
    ],
    // most of the codebase are expected to be env agnostic
    // 'no-restricted-globals': ['error', ...DOMGlobals, ...NodeGlobals],
    // since we target ES2015 for baseline support, we need to forbid object
    // rest spread usage (both assign and destructure)
    'no-restricted-syntax': [
      'error',
      'ObjectExpression > SpreadElement',
      'ObjectPattern > RestElement',
      'AwaitExpression'
    ]
  },
  overrides: [
    // tests, no restrictions (runs in Node / jest with jsdom)
    {
      files: ['**/__tests__/**', 'test-dts/**'],
      rules: {
        'no-restricted-globals': 'off',
        'no-restricted-syntax': 'off'
      }
    }
  ]
}