Typescript Error After Upgrading Version 4 Useparams From React Router Dom Property Sumparams Does Not Exist On Type

If you’ve recently upgraded your TypeScript version to 4 and encountered an error related to the useParams property from React Router Dom, you’re not alone. This common issue often arises due to changes in TypeScript definitions or mismatched types. But fret not – in this article, we'll walk you through how to resolve the "sumparams does not exist on type" error and get your project back up and running smoothly.

### Understanding the Error
The error message "Property 'sumparams' does not exist on type 'Params'" typically occurs when there is a discrepancy between the expected properties in your code and the actual properties available. This can be due to changes in TypeScript definitions, especially when upgrading to a newer version like TypeScript 4.

### Solution: Updating React Router Dom Types
To fix this issue, you need to update the types for React Router Dom in your project. Start by ensuring you have the latest version of @types/react-router-dom installed. You can do this using npm or yarn:

npm install @types/react-router-dom

or

yarn add @types/react-router-dom

This will fetch the latest type definitions for React Router Dom, including any recent changes or additions that might be causing the error.

### Adjusting Your Code
Once you have updated the type definitions, you may need to modify your code to align with the changes. Check where you are using the useParams property and verify that it is being accessed correctly.

For instance, if you are trying to access a parameter named 'sumparams' using useParams, ensure that the parameter is correctly defined in your routing setup. Double-check the key name and data type to match the expected values.

### Example Code Adjustment
Here’s an example of how you can adjust your code to resolve the error:

import { useParams } from 'react-router-dom';

interface RouteParams {
  sumparams: string;
}

const MyComponent = () => {
  const { sumparams } = useParams();
  // Your code handling the sumparams value
}

By explicitly defining the expected parameter in an interface and using it with useParams, TypeScript can correctly infer the type and prevent the "sumparams does not exist on type" error.

### Testing and Validation
After making these adjustments, ensure to thoroughly test your application to validate that the error has been resolved. Check different scenarios where you use the affected code to confirm that everything is functioning as expected.

### Conclusion
In conclusion, encountering TypeScript errors like "Property 'sumparams' does not exist on type 'Params'" after upgrading to version 4 is a common issue that can be easily resolved by updating React Router Dom types and adjusting your code accordingly. By following the steps outlined in this article, you should be able to troubleshoot and fix this error effectively, keeping your project on track with the latest TypeScript updates.