workspace with decoupled nostr package

packages/app/src/Feed/FollowsFeed.ts

@@ -0,0 +1,23 @@
+import { useMemo } from "react";
+import { HexKey } from "@snort/nostr";
+import { EventKind, Subscriptions } from "@snort/nostr";
+import useSubscription, { NoteStore } from "Feed/Subscription";
+
+export default function useFollowsFeed(pubkey: HexKey) {
+  const sub = useMemo(() => {
+    const x = new Subscriptions();
+    x.Id = `follows:${pubkey.slice(0, 12)}`;
+    x.Kinds = new Set([EventKind.ContactList]);
+    x.Authors = new Set([pubkey]);
+
+    return x;
+  }, [pubkey]);
+
+  return useSubscription(sub);
+}
+
+export function getFollowers(feed: NoteStore, pubkey: HexKey) {
+  const contactLists = feed?.notes.filter(a => a.kind === EventKind.ContactList && a.pubkey === pubkey);
+  const pTags = contactLists?.map(a => a.tags.filter(b => b[0] === "p").map(c => c[1]));
+  return [...new Set(pTags?.flat())];
+}