https://delusionist.netlify.app/js/loading.js

1(function() {
2    function getNavigationType() {
3        const entry = performance.getEntriesByType('navigation')[0];
4        if (entry) return entry.type;
5        if (!performance.navigation) return 'navigate';
6        if (performance.navigation.type === 0) return 'navigate';
7        if (performance.navigation.type === 1) return 'reload';
8        return 'back_forward';
9    }
10
11    const navigationType = getNavigationType();
12    const isReload = navigationType === 'reload';
13    const isSameTabReload = isReload && sessionStorage.getItem('pageVisited') === 'true';
14    const lastHeartbeat = localStorage.getItem('delusionist_lastHeartbeat');
15    const hasActiveTabs = lastHeartbeat && (Date.now() - parseInt(lastHeartbeat)) < 3000;
16    const isTabDuplicate = !isReload && navigationType === 'navigate' &&
17                           localStorage.getItem('delusionist_pageVisited') === 'true' && hasActiveTabs;
18
19    if (isSameTabReload || isTabDuplicate) {
20        const style = document.createElement('style');
21        style.textContent = '#loadingScreen { display: none !important; }';
22        document.head.appendChild(style);
23    } else if (navigationType === 'navigate' && !hasActiveTabs) {
24        localStorage.removeItem('delusionist_pageVisited');
25        localStorage.removeItem('delusionist_lastHeartbeat');
26    }
27
28    sessionStorage.setItem('pageVisited', 'true');
29    localStorage.setItem('delusionist_pageVisited', 'true');
30
31    function sendHeartbeat() {
32        localStorage.setItem('delusionist_pageVisited', 'true');
33        localStorage.setItem('delusionist_lastHeartbeat', Date.now().toString());
34    }
35
36    let heartbeatInterval = setInterval(sendHeartbeat, 1000);
37
38    document.addEventListener('visibilitychange', function() {
39        clearInterval(heartbeatInterval);
40        if (!document.hidden) {
41            heartbeatInterval = setInterval(sendHeartbeat, 1000);
42        }
43    });
44
45    function onPageExit() {
46        clearInterval(heartbeatInterval);
47        sendHeartbeat();
48    }
49
50    window.addEventListener('pagehide', onPageExit);
51    window.addEventListener('beforeunload', onPageExit);
52})();