wakelock.ts

1	export const createWakeLockManager = () => {
2	type WakeLockSentinelLike = {
3	release: () => Promise<void>;
4	addEventListener: (type: 'release', listener: () => void) => void;
5	};
6
7	let wakeLockSentinel: WakeLockSentinelLike \| null = null;
8	const hasWakeLockSupport = typeof navigator !== 'undefined' && 'wakeLock' in navigator;
9	let wakeLockRequested = false;
10
11	const getWakeLockApi = () => (navigator as Navigator & {
12	wakeLock?: { request: (type: 'screen') => Promise<WakeLockSentinelLike> }
13	}).wakeLock;
14
15	const releaseWakeLock = async () => {
16	if (!wakeLockSentinel) return;
17
18	try {
19	await wakeLockSentinel.release();
20	} catch (err) {
21	console.debug('Wake lock release failed', err);
22	} finally {
23	wakeLockSentinel = null;
24	}
25	};
26
27	const requestWakeLock = async () => {
28	if (!hasWakeLockSupport) return;
29	if (!wakeLockRequested) return;
30	if (document.visibilityState !== 'visible') return;
31	if (wakeLockSentinel) return;
32
33	try {
34	const nextSentinel = await getWakeLockApi()?.request('screen');
35	if (!nextSentinel) return;
36
37	if (!wakeLockRequested \|\| document.visibilityState !== 'visible') {
38	await nextSentinel.release();
39	return;
40	}
41
42	wakeLockSentinel = nextSentinel;
43	wakeLockSentinel.addEventListener('release', () => {
44	wakeLockSentinel = null;
45	if (wakeLockRequested && document.visibilityState === 'visible') {
46	void requestWakeLock();
47	}
48	});
49	} catch (err) {
50	console.debug('Wake lock request failed', err);
51	}
52	};
53
54	const setWakeLockEnabled = async (enabled: boolean) => {
55	wakeLockRequested = enabled;
56	if (!enabled) {
57	await releaseWakeLock();
58	return;
59	}
60
61	await requestWakeLock();
62	};
63
64	return {
65	requestWakeLock,
66	setWakeLockEnabled,
67	hasWakeLockSupport: () => hasWakeLockSupport,
68	isWakeLockEnabled: () => wakeLockRequested
69	};
70	};