React

HTML

<div id="app">

</div>

React

window.onerror = (msg, url, lineNo, columnNo, error) => {
console.log(msg)
  alert(msg)
}

class TodoApp extends React.Component {
  constructor(props) {
    super(props)
    
    
  }
  
  render() {

    return (
      <button onClick={(e)=>{
        console.log("clicked")
      	null.bla
      }}>
        Create an error
        
      </button>
    )
  }
}

ReactDOM.render(<TodoApp />, document.querySelector("#app"))