old_contents: module.exports = {
    extends: 'eslint:recommended',
    parserOptions: {
      sourceType: 'script',
      modules: true,
    },
    env: {
      es6: true,
      node: true,
      jest: true,
      mocha: true,
    },
    plugins: ['prettier'],
    rules: {
      'prettier/prettier': 'error',
    },
  };
  
new_contents: module.exports = {
    extends: 'eslint:recommended',
    parserOptions: {
      sourceType: 'script',
      modules: true,
    },
    env: {
      browser: true,
      es6: true,
      node: true,
      jest: true,
      mocha: true,
    },
    plugins: ['prettier'],
    rules: {
      'prettier/prettier': 'error',
    },
  };
  
subject: Enable 'browser' environment for ESLint