input's event.target is null within this.setState [React.js]

Question

In my react component I have a file input:

` 

and my onFileChan

Answer 1

class Example extends React.Component {

  onFileChange = e => {
    let file = e.target.files[0];
    this.setState(() => ({ file: file }));
  }
  render() {
    return ;
  }
}

ReactDOM.render(
  ,
  document.getElementById('root')
);