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JavaScript Configuring Webpack

Julian Valencia
Julian Valencia
10,492 Points

I get this error: "_react2.default.createClass is not a function" and React.PropTypes is undefined

In the video there are no Javascript errors, but I see this:

Uncaught TypeError: react2.default.createClass is not a function at Object.<anonymous> (bundle.js:986) at __webpack_require_ (bundle.js:20) at module.exports (bundle.js:63) at bundle.js:66

Also, the React.PropTypes used in the project files is no longer working

Ari Misha
Ari Misha
19,323 Points

Hiya there! Can you post your whole code here? (:

2 Answers

Julian Valencia
Julian Valencia
10,492 Points

Ok, I found the solution!

Due to updates on the latest versions of React, in order to use Create Class you'll need to import an additional package:

sudo npm install create-react-class --save

And then change the way you do the Create Class like this:

var createReactClass = require('create-react-class');
const Scoreboard = createReactClass({ ...

Note that PropTypes also changed, it has been moved to an external package so in order to use PropTypes you'll need to import the package:

sudo npm install prop-types --save

And then reference the PropTypes like this:

Import the package: import PropTypes from 'prop-types';

 Header.propTypes = {
  players: PropTypes.array.isRequired,
};
;```
John Potts
John Potts
978 Points

Thank you, worked perfectly!

Hello !

I have same problem, "Uncaught TypeError: _react2.default.createReactClass is not a function".

I followed the configuration videos, and I try your answer, but I still have the problem.

I am at this video : https://teamtreehouse.com/library/hot-reloading-your-react-app

Best regards,

I had the same issue, too. Make sure you remove the React prefix from these statements, since---as Julian said---they are no longer part of React, but are separate packages.

So instead of React.createClass({..., you'll have createReactClass({.... Likewise, instead of React.PropTypes.array.isRequired, you would have just PropTypes.array.isRequired. Just get rid of the React prefix.