waitlist/lib/db.ts

import { MongoClient } from "mongodb";

const uri = process.env.MONGODB_URI as string; // Connection string from .env.local

if (!process.env.MONGODB_URI) {
  throw new Error("Please add your MongoDB URI to .env.local");
}

let client =
  process.env.NODE_ENV === "development"
    ? global.mongo
    : { conn: null, promise: null };

if (!client.promise) {
  client.promise = MongoClient.connect(uri).then((mongoClient) => {
    client.conn = mongoClient;
    return mongoClient;
  });
}

export default client;