[Typescript] How to type ref ?

[GautierT]

Hi.

I'm using typescript and i need to type the countdownRef

const countdownRef = useRef();

<Countdown
        ref={countdownRef}
        date={1000}
/>

What should I do ? Thanks.

[carlosriveroib]

here you have the answer :)

[GautierT]

Thanks a lot !

All I was doing wrong was not explicitly including "null" as the parameter in the useRef initialization (it expects null, not undefined).

https://stackoverflow.com/a/69143200/2633092

[carlosriveroib]

If you create a ref with undefined const ref = useRef<HTMLDivElement> = useRef() the returned type is MutableRefObject<HTMLDivElement | undefined>

If you create a ref with null const ref = useRef<HTMLDivElement> = useRef(null) the returned type is RefObject

that was the problem

[ndresx]

Thank you!