snort/src/Element/FollowsYou.tsx

import "./FollowsYou.css";
import { useMemo } from "react";
import { useSelector } from "react-redux";
import { HexKey } from "Nostr";
import { RootState } from "State/Store";
import useFollowsFeed from "Feed/FollowsFeed";
import { getFollowers } from "Feed/FollowsFeed";

export interface FollowsYouProps {
  pubkey: HexKey;
}

export default function FollowsYou({ pubkey }: FollowsYouProps) {
  const feed = useFollowsFeed(pubkey);
  const loginPubKey = useSelector<RootState, HexKey | undefined>(
    (s) => s.login.publicKey
  );

  const pubkeys = useMemo(() => {
    return getFollowers(feed.store, pubkey);
  }, [feed]);

  const followsMe = pubkeys.includes(loginPubKey!) ?? false;

  return (
    <>{followsMe ? <span className="follows-you">follows you</span> : null}</>
  );
}