ReactJS giving error Uncaught TypeError: Super expression must either be null or a function, not undefined

Troubleshooting "Uncaught TypeError: Super expression must either be null or a function, not undefined" error in ReactJS

Hey there! 👋 Are you experiencing the frustrating "Uncaught TypeError: Super expression must either be null or a function, not undefined" error while working with ReactJS? Don't worry, you're not alone! 😅 This error is quite common and can be easily fixed. Let's dive into the issue and find a solution together, shall we? 💪

The Problem

In the provided context, the error occurs when running the following code:

var React = require('react');

class HelloMessage extends React.Component {
  render() {
    return <div>Hello </div>;
  }
}

And it results in this error message:

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

The Solution

Fortunately, the solution to this problem is fairly straightforward. It typically occurs when incompatible versions of React are being used. Here's what you can do to fix it:

1. Check React version

Start by verifying which version of React you have installed. In the provided context, the issue was resolved by ensuring the latest version was being used. You can install the correct version by running the following commands:

Global installation

sudo npm install -g react@0.13.2

Local installation

npm install react@0.13.2

2. Ensure browser compatibility

Additionally, make sure your browser is also using the correct version of React. Add the following script tag to your HTML file to include the specific version:

<script type="text/javascript" src="react-0.13.2.js"></script>

Make sure the src attribute contains the correct path to the React script according to your project structure.

In Conclusion

By following these steps, you should be able to resolve the "Uncaught TypeError: Super expression must either be null or a function, not undefined" error in your ReactJS application. 🎉

If you found this guide helpful, give it a thumbs up 👍 and share it with your fellow developers to save them from burning in hellfire for three days! 🔥 If you have any questions or other React-related issues, feel free to leave a comment below. Let's support each other and keep building awesome things with React! 💙