Скачать или смотреть Fixing the React TypeError: Class constructor Fullpage cannot be invoked without 'new' Error

Learn how to resolve the common React error related to class constructors, ensuring your components function correctly.
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This video is based on the question https://stackoverflow.com/q/62862856/ asked by the user 'Atousa' ( https://stackoverflow.com/u/6790784/ ) and on the answer https://stackoverflow.com/a/62863047/ provided by the user 'Ramil Garipov' ( https://stackoverflow.com/u/5402974/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding and Fixing React TypeError: Class Constructor Fullpage Cannot Be Invoked Without 'new'

If you're a React developer using class components, you may have encountered a frustrating error that states: TypeError: Class constructor Fullpage cannot be invoked without 'new'. This error can impede your application and disrupt development. In this guide, we’ll explore what causes this issue and how you can resolve it effectively.

What Causes the Error?

This error typically occurs when the class you define for a component extends from the wrong class. In React, class components should always inherit from the Component class provided by the React library. If a developer mistakenly extends from a different class—like Comment—it disrupts the instance creation, resulting in the error mentioned.

Example Scenario

Take a look at the following problematic code snippet from a Fullpage.js file:

[[See Video to Reveal this Text or Code Snippet]]

How to Fix the Error

To resolve this error, you'll want to ensure that your class correctly extends from the Component class. Here’s how you can make the necessary changes:

Step 1: Modify the Class Extension

Change the class declaration in Fullpage.js from Comment to Component. Here’s the corrected version of that file:

[[See Video to Reveal this Text or Code Snippet]]

Import Statement Unchanged: Make sure to keep all import statements as they are.

Correct Class Declaration: Change class Fullpage extends Comment to class Fullpage extends Component.

Step 2: Reload Your Application

Once the changes are made, save your files and rerun your application using your development server (usually with npm start or yarn start). This will compile the changes and should eliminate the error.

Conclusion

React is a powerful library for building user interfaces, but it can sometimes present challenges that require keen attention to detail. The TypeError: Class constructor Fullpage cannot be invoked without 'new' error is a classic example of how a simple mistake can lead to frustration in your React development. By ensuring that your components extend from the appropriate class, you can easily rectify this issue and maintain a smooth development experience.

If you follow the steps outlined in this post, you should be well on your way to resolving this issue and getting back to building your application smoothly. Happy coding!