class Foo extends React.Component {
  render() {
    return <div>This is a class component.</div>;
  }
}

class Bar extends React.PureComponent {
  render() {
    return <div>This is a class component.</div>;
  }
}

export class Foo extends React.Component {
  render() {
    return <div>This is a class component.</div>;
  }
}

export default class Baz extends React.Component {
  render() {
    return <div>This is a class component.</div>;
  }
}
