no-find-dom-node

import React, { Component } from "react";
import { findDOMNode } from "react-dom";
 
class AutoSelectingInput extends Component {
  componentDidMount() {
    const input = findDOMNode(this);
    //            ^^^^^^^^^^^^^^^^^
    //            - The 'findDOMNode' will be removed in a future version of React. Use the the alternatives instead.
    if (input instanceof HTMLInputElement) {
      input.select();
    }
  }
  render() {
    return <input defaultValue="Hello" />;
  }
}

import React, { Component } from "react";
 
class AutoSelectingInput extends Component {
  inputRef = React.createRef<HTMLInputElement>();
 
  componentDidMount() {
    const input = this.inputRef.current;
    input?.select();
  }
 
  render() {
    return <input ref={this.inputRef} defaultValue="Hello" />;
  }
}