https://factchecker.cloud/src/utils/boardSeen.ts

1import { safeGetItem, safeSetItem } from "/src/utils/storageUtils.ts";
2/** 게시판을 마지막으로 본 시각(사용자별, 이 브라우저) — '새 글' 표시 기준. */
3export const BOARD_SEEN_EVENT = "board-seen";
4const key = (userId) => `board_last_seen:${userId}`;
5export function getBoardLastSeen(userId) {
6	if (!userId) return null;
7	const raw = safeGetItem(key(userId));
8	const t = raw ? Date.parse(raw) : NaN;
9	return Number.isFinite(t) ? t : null;
10}
11export function markBoardSeen(userId, latestIso) {
12	if (!userId || !latestIso) return;
13	const prev = getBoardLastSeen(userId);
14	if (prev !== null && prev >= Date.parse(latestIso)) return;
15	safeSetItem(key(userId), latestIso);
16	// 같은 탭의 헤더 표시를 즉시 갱신(다른 탭은 storage 이벤트로).
17	window.dispatchEvent(new Event(BOARD_SEEN_EVENT));
18}
19
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