Typo in static class property declaration

CODE:

import React from 'react';
import ReactDOM from 'react-dom';

class Learnreactdeafult extends React.Component
{
  render(){
    return <h1>Hi {this.props.topic} {this.props.message} </h1>
  }
}
Learnreactdeafult.defaultprops={topic:"Ravenswag",message:"welcome"}
ReactDOM.render(<Learnreactdeafult topic="Raven"/>,document.getElementById('root'));