typescript for class component + react code example

Example 1: react tsx component example

import React from 'react';

interface Props {
}

const App: React.FC<Props> = (props) => {
  return (
    <div><div/>
  );
};

export default App;

Example 2: state in react typescript

interface IProps {
}

interface IState {
  playOrPause?: string;
}

class Player extends React.Component<IProps, IState> {
  // ------------------------------------------^
  constructor(props: IProps) {
    super(props);

    this.state = {
      playOrPause: 'Play'
    };
  }

  render() {
    return(
      <div>
        <button
          ref={playPause => this.playPause = playPause}
          title={this.state.playOrPause} // in this line I get an error
        >
          Play
        </button>
      </div>
    );
  }
}