Establish the publication foundation

src/lib/content.ts

@@ -0,0 +1,28 @@
+import type { CollectionEntry } from 'astro:content';
+
+type DatedEntry =
+  | CollectionEntry<'stories'>
+  | CollectionEntry<'briefings'>
+  | CollectionEntry<'episodes'>;
+
+export function newestFirst<T extends DatedEntry>(entries: T[]): T[] {
+  return [...entries].sort(
+    (a, b) => b.data.published.valueOf() - a.data.published.valueOf(),
+  );
+}
+
+export function guidesByReview(
+  entries: CollectionEntry<'guides'>[],
+): CollectionEntry<'guides'>[] {
+  return [...entries].sort(
+    (a, b) => b.data.reviewed.valueOf() - a.data.reviewed.valueOf(),
+  );
+}
+
+export function formatDate(date: Date): string {
+  return new Intl.DateTimeFormat('en-GB', {
+    day: 'numeric',
+    month: 'short',
+    year: 'numeric',
+  }).format(date);
+}