ReactJs CreateClass is not a function

Per the documents, you need to get the npm create react class package. From the command line of your project’s file path, you need to do npm install create-react-class --save, and then modify the code like this:

var React = require('react');
//You need this npm package to do createReactClass
var createReactClass = require('create-react-class');

    module.exports=createReactClass({
            render:function(){
                return(
                    <div>
                        <h1> the list  </h1>
                    </div>   
                )
            }

You also need React DOM to render the components like this:

npm install react react-dom
var ReactDOM = require('react-dom');
ReactDOM.render(<GroceryItemList/>,app);