Is it possible to override default typings?

I'm working on accessibility and thought "I'll just make `alt` a required attribute in my project." My aim is for all `img` tags in my react app to complain if an `alt` attribute has not been provided. So, I created a `.d.ts` file where I have added the following:

```typescript import { HTMLAttributes } from 'react'; declare module 'react' { export interface ImgHTMLAttributes<T> extends HTMLAttributes<T> { alt: string; } } ```

I'm getting these errors:

>All declarations of 'alt' must have identical modifiers.

>Subsequent property declarations must have the same type. Property 'alt' must be of type 'string | undefined', but here has type 'string'.

Is there a way to indicate that I'm trying to *override*, and not *extend*? Or is there a better way to go about this?