StrictMode: Warning about deprecated findDOMNode usage

//you can instead pass a ref to your custom component and pass that along to the DOM using ref forwarding

//you can also add a wrapper DOM node in your component and attach a ref  directly to it

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.wrapper = React.createRef();
  }
  render() {
    return <div ref={this.wrapper}>{this.props.children}</div>;
  }
}