TypeError: Super expression must either be null or a function, not undefined

TypeError: Super expression must either be null or a function, not undefined

_inherits http://localhost:3000/static/js/bundle.js:42168:113
(anonymous function) http://localhost:3000/static/js/bundle.js:42213:2
./src/index.js
F:/git/nodejs-study/imocc/create-react-app/my-app/src/index.js:24

错误原因：component的c应该是大写的
class Test extends React.component{
constructor(props){
super(props);
}

render(){
console.log(this.props)
return <h2>测试组件</h2>
}

}