web/packages/trpc/lib/routers/user/utils/getMemberShipNumber.ts

import { isValidSession } from "../../../utils/session"
import { getVerifiedUser } from "./getVerifiedUser"

import type { Session } from "next-auth"

export async function getMembershipNumber(
  session: Session | null
): Promise<string | undefined> {
  if (!isValidSession(session)) return undefined

  const verifiedUser = await getVerifiedUser({ session })
  if (!verifiedUser || "error" in verifiedUser) {
    return undefined
  }

  return verifiedUser.data.membershipNumber
}