아래와 같은 플러그인 코드에서 headers에 적용된 스키마가 정상적으로 동작하지 않음.

export const adminGuard = new Elysia({ name: "admin-guard" })
  .state({
    admin: {} as AdminPayload,
  })
  .guard({
    // Here
    headers: adminGuardHeaderSchema,
  })
  .macro(({ onBeforeHandle }) => ({
    adminGuard(options?: { privileges: string[] }) {
      if (!options) return;

      onBeforeHandle(async ({ store, headers }) => {
        if (!Value.Check(adminGuardHeaderSchema, headers)) {
          throw new AppError(401, "Failed to authenticate admin");
        }
        store.admin = await extractAdminPayload(headers["authorization"]);
      });

      const { privileges } = options;
      if (privileges) {
        onBeforeHandle(async ({ store: { admin }, headers }) => {
          const hasPrivilege = checkPrivilege(
            headers["target-category"],
            privileges,
            admin.privilegeNames,
          );
          if (!hasPrivilege) {
            throw new AppError(403, `You are not allowed to access this api`);
          }
        });
      }
    },
  }));

그래서 Value.Check를 따로 불러주도록해서 대응함