useDelay.ts

/**
 * Returns a function that delays callback.
 */
const useDelay = () => {
    const ref = useRef<(fn: Function, ms: number) => void | null>(null);

    if(ref.current === null) {
        let t = -1;
        const delay = (fn: Function, ms: number) => { 
            clearTimeout(t);
            t = setTimeout(fn, ms); 
        }
        
        ref.current = delay;
    }

    return ref.current as (fn: Function, ms: number) => void;
}