https://pressthink.org/j/rosen-archive/frontend/services/releaseMetadata.js?v=3.8.36

1const SEMVER = /^\d+\.\d+\.\d+$/;
2const ISO_DATE = /^\d{4}-\d{2}-\d{2}$/;
3
4const isRealIsoDate = (value) => {
5  if (!ISO_DATE.test(value)) return false;
6  const date = new Date(`${value}T00:00:00.000Z`);
7  return !Number.isNaN(date.getTime()) && date.toISOString().slice(0, 10) === value;
8};
9
10export function normalizeReleaseMetadata(value) {
11  if (!value || typeof value !== 'object') return null;
12  const version = typeof value.version === 'string' ? value.version.trim() : '';
13  const updated = typeof value.updated === 'string' ? value.updated.trim() : '';
14  if (!SEMVER.test(version) || !isRealIsoDate(updated)) return null;
15  return { version, updated };
16}
17
18export function formatReleaseDate(value) {
19  if (typeof value !== 'string' || !isRealIsoDate(value)) return '';
20  const date = new Date(`${value}T00:00:00.000Z`);
21  return new Intl.DateTimeFormat('en-US', {
22    month: 'long',
23    day: 'numeric',
24    year: 'numeric',
25    timeZone: 'UTC',
26  }).format(date);
27}
28
29export function createReleaseMetadataLoader({
30  fetchImpl = globalThis.fetch,
31  url = './version.json',
32  now = Date.now,
33} = {}) {
34  let pending = null;
35
36  return () => {
37    if (pending) return pending;
38    const separator = url.includes('?') ? '&' : '?';
39    const requestUrl = `${url}${separator}t=${now()}`;
40    const current = (async () => {
41      const response = await fetchImpl(requestUrl, { cache: 'no-store' });
42      if (!response?.ok) {
43        throw new Error(`release metadata request failed: HTTP ${response?.status ?? 'unknown'}`);
44      }
45      const metadata = normalizeReleaseMetadata(await response.json());
46      if (!metadata) throw new Error('release metadata response is invalid');
47      return metadata;
48    })();
49
50    pending = current;
51    current.catch(() => {
52      if (pending === current) pending = null;
53    });
54    return current;
55  };
56}
57
58export const loadReleaseMetadata = createReleaseMetadataLoader();