msgapp/src/app/boards/[id]/page.tsx

import { PostList } from "@/app/components/PostList";
import { headers } from "next/headers";

// Next 15: params/searchParams가 Promise가 될 수 있어 안전 언랩 처리합니다.
export default async function BoardDetail({ params, searchParams }: { params: any; searchParams: any }) {
  const p = params?.then ? await params : params;
  const sp = searchParams?.then ? await searchParams : searchParams;
  const id = p.id as string;
  const sort = (sp?.sort as "recent" | "popular" | undefined) ?? "recent";
  // 보드 slug 조회 (새 글 페이지 프리셋 전달)
  const h = await headers();
  const host = h.get("host") ?? "localhost:3000";
  const proto = h.get("x-forwarded-proto") ?? "http";
  const base = process.env.NEXT_PUBLIC_BASE_URL || `${proto}://${host}`;
  const res = await fetch(new URL("/api/boards", base).toString(), { cache: "no-store" });
  const { boards } = await res.json();
  const board = (boards || []).find((b: any) => b.id === id);
  return (
    <div>
      <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center" }}>
        <h1>게시판</h1>
        <a href={`/posts/new?boardId=${id}${board?.slug ? `&boardSlug=${board.slug}` : ""}`}><button>새 글</button></a>
      </div>
      <PostList boardId={id} sort={sort} />
    </div>
  );
}