javascript - Warning: React.createElement: type should not be null, undefined, boolean, or number -

warning: react.createelement: type should not null, undefined, boolean, or number. should string (for dom elements) or reactclass (for composite components).

i putting react page , have come across error above when try use es2015 style code. when use following code error

var react = require('react'); export default class storeapp extends react.component {   getinitialstate() {     return null;   }    render() {     return (       <div>         <p>this should display on screen</p>       </div>     );   } } 

this works fine...

var react = require('react');  var storeapp = react.createclass({   render: function() {     return (       <div>         <p>this should display on screen</p>       </div>     );   } });  module.exports = storeapp; 

im using babel following presets ['react','es2015'] ideas whats going on here?

in es6 can't use getinitialstate(). use constructor().

e.g.

constructor(props) {   super(props);   //set state here using this.state = {};   //or leave blank if don't want set in state } 

if you're not putting in state can leave constructor out in es6 class.