old_contents: var rules = require('./rules');
  
  module.exports = {
    env: {
      browser: true,
      node: true,
      es6: true,
    },
    rules: rules,
    plugins: ['react'],
  };
  
new_contents: var rules = require('./rules');
  
  module.exports = {
    env: {
      browser: true,
      node: true,
      es6: true,
    },
    parserOptions: {
      ecmaFeatures: {
        jsx: true,
      },
    },
    rules: rules,
    plugins: ['react'],
  };
  
subject: Enable jsx by default.