setTimeout in componentDidMount

setTimeout-in-componentDidMount.js

class NewMessages extends React.PureComponent {
  updateTimeout;
  
  componentDidMount() {
    this.updateMessages();
  }
  
  updateMessages = async () => {
    // thunk
    await this.props.getNewMessages(); // waiting for request

    this.updateTimeout = setTimeout(this.updateMessages, 500);
  }
  
  componentWillUnmount() {
    clearTimeout(updateTimeout);
  }

  render() {
    return (
      <div>
        {this.props.newMessages}
      </div>
    );
  }
}