TypeScript – What data type is for setTimeout() and how to use setTimeout() in React

React lets you build user interfaces out of individual pieces called components. Create your own React components like Thumbnail, LikeButton, and Video. Then combine them into entire screens, pages, and apps.

Solution #1

React example:

    useEffect(() => {

        let timer!: ReturnType<typeof setTimeout>;

        timer = setTimeout(() => {
           ...
        }, 3000);

        return () => {
            if (timer) {
                clearTimeout(timer);
            }
        };
    });

Solution #2

React example:

    useEffect(() => {

        let timer!: NodeJS.Timeout;
        
        timer = setTimeout(() => {
           ...
        }, 3000);
        
        return () => {
            if (timer) {
                clearTimeout(timer);
            }
        };
    });

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