how to use the iserror function from the underscore library in typescript

To use the isError function from the Underscore library, you first need to install it in your project by adding it to the dependencies in your package.json file and running npm install.

Once you have the Underscore library installed, you can import the isError function at the top of your TypeScript file like this:

index.ts
import { isError } from 'underscore';
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The isError function can then be used to determine if a value is an Error object or not. Here is an example to demonstrate:

index.ts
function handleError(error: unknown) {
  if (isError(error)) {
    // Handle the error
  }
  else {
    throw new TypeError('Expected an Error object');
  }
}
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In this example, the handleError function takes an argument of type unknown, which could be any value. If the value is an Error object, it is handled appropriately. If not, a TypeError is thrown.

Using the isError function from Underscore helps ensure type safety in your code by checking that the error object is of the correct type before handling it. This can help prevent unexpected errors in your application.