how to use the notfounderror function from the rxjs library in javascript

To use the NotFoundError function from rxjs library in JavaScript, you first need to include the rxjs library in your project. You can do that by using npm:

npm install rxjs
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Once you have installed the rxjs library, you can import the NotFoundError function in your JavaScript code like this:

index.tsx
import { NotFoundError } from 'rxjs';
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After importing the NotFoundError function, you can create a new instance of the NotFoundError class and provide a message as the parameter. For example:

index.tsx
throw new NotFoundError('User not found');
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The above code will throw a new instance of the NotFoundError class with the message "User not found".

It's worth noting that NotFoundError is just one of many error handling classes provided by the rxjs library for use in observable contexts.