Fetch dates for each tag, if GitHub releases aren't used

Author: grega

src/lib/fetchers/github.ts

@@ -71,10 +71,24 @@ async function fetchTags(
 
 	const regex = new RegExp(tagPattern);
 	const filtered = data.filter((t: Record<string, unknown>) => regex.test(String(t.name)));
-
-	return filtered.slice(0, 15).map((t: Record<string, unknown>) => ({
+	const tags = filtered.slice(0, 15);
+
+	const dates = await Promise.all(
+		tags.map(async (t: Record<string, unknown>) => {
+			const sha = (t.commit as Record<string, unknown>)?.sha;
+			if (!sha) return '';
+			const commitUrl = `https://api.github.com/repos/${repo}/git/commits/${sha}`;
+			const commitRes = await fetch(commitUrl, { headers: headers() });
+			if (!commitRes.ok) return '';
+			const commit = await commitRes.json();
+			const dateStr = commit.committer?.date ?? commit.author?.date ?? '';
+			return String(dateStr).split('T')[0];
+		})
+	);
+
+	return tags.map((t: Record<string, unknown>, i: number) => ({
 		version: cleanVersion(String(t.name), tagReplace),
-		date: '',
+		date: dates[i],
 		prerelease: false,
 		lts: false,
 		url: `https://github.com/${repo}/releases/tag/${t.name}`

tests/fixtures/github-tags.json

@@ -1,8 +1,8 @@
 [
-  {"name": "REL_16_2"},
-  {"name": "REL_16_1"},
-  {"name": "REL_15_6"},
-  {"name": "REL_15_5"},
-  {"name": "some-other-tag"},
-  {"name": "REL_14_11"}
+  {"name": "REL_16_2", "commit": {"sha": "aaa111"}},
+  {"name": "REL_16_1", "commit": {"sha": "bbb222"}},
+  {"name": "REL_15_6", "commit": {"sha": "ccc333"}},
+  {"name": "REL_15_5", "commit": {"sha": "ddd444"}},
+  {"name": "some-other-tag", "commit": {"sha": "eee555"}},
+  {"name": "REL_14_11", "commit": {"sha": "fff666"}}
 ]

tests/unit/fetchers/github.test.ts

@@ -102,10 +102,20 @@ describe('fetchGitHub', () => {
 	});
 
 	it('falls back to tags API when releases API returns no matches', async () => {
-		// Releases API returns empty after filtering
+		const commitDate = (date: string) =>
+			new Response(JSON.stringify({ committer: { date: `${date}T12:00:00Z` } }), {
+				status: 200
+			});
+
+		// Releases API returns empty after filtering, then tags API, then per-tag commits
 		vi.spyOn(globalThis, 'fetch')
 			.mockResolvedValueOnce(new Response(JSON.stringify([]), { status: 200 }))
-			.mockResolvedValueOnce(new Response(JSON.stringify(tagsFixture), { status: 200 }));
+			.mockResolvedValueOnce(new Response(JSON.stringify(tagsFixture), { status: 200 }))
+			.mockResolvedValueOnce(commitDate('2026-03-10'))
+			.mockResolvedValueOnce(commitDate('2026-03-05'))
+			.mockResolvedValueOnce(commitDate('2026-02-20'))
+			.mockResolvedValueOnce(commitDate('2026-02-10'))
+			.mockResolvedValueOnce(commitDate('2026-01-15'));
 
 		const config: PackageConfig = {
 			...baseConfig,
@@ -116,7 +126,9 @@ describe('fetchGitHub', () => {
 
 		expect(result.releases).toHaveLength(5);
 		expect(result.latest?.version).toBe('16.2');
+		expect(result.latest?.date).toBe('2026-03-10');
 		expect(result.releases[2].version).toBe('15.6');
+		expect(result.releases[2].date).toBe('2026-02-20');
 	});
 
 	it('filters monorepo releases by tagPattern (e.g. Astro)', async () => {