@pdftron/webviewer-react-toolkit/lib/hooks/useUnmountDelay.js

A React component library for integrating with PDFTron WebViewer API.

import { useEffect, useMemo, useState } from 'react';
export function useUnmountDelay(on = false, delay = 250) {
    const [mounted, setMounted] = useState(on);
    useEffect(() => {
        if (!on) {
            const timeoutId = window.setTimeout(() => {
                setMounted(false);
            }, delay);
            return () => window.clearTimeout(timeoutId);
        }
        setMounted(true);
        return;
    }, [delay, on]);
    const value = useMemo(() => ({
        mounted,
        unmounting: mounted && !on,
    }), [mounted, on]);
    return value;
}