All files / lib mongodb.ts

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  import mongoose from "mongoose";
 
if (!process.env.MONGODB_URI) {
  throw new Error('Invalid/Missing environment variable: "MONGODB_URI"');
}
 
const MONGODB_URI = process.env.MONGODB_URI;
 
interface MongooseCache {
  conn: typeof mongoose | null;
  promise: Promise<typeof mongoose> | null;
}
 
declare global {
  var mongoose: MongooseCache | undefined;
}
 
const cached: MongooseCache = global.mongoose || { conn: null, promise: null };
 
if (!global.mongoose) {
  global.mongoose = cached;
}
 
export async function connectDB(): Promise<typeof mongoose> {
  if (cached.conn) {
    return cached.conn;
  }
 
  if (!cached.promise) {
    const opts = {
      bufferCommands: false,
    };
 
    cached.promise = mongoose.connect(MONGODB_URI, opts).then((mongoose) => {
      console.log("✅ MongoDB connected successfully");
      return mongoose;
    });
  }
 
  try {
    cached.conn = await cached.promise;
  } catch (e) {
    cached.promise = null;
    console.error("❌ MongoDB connection error:", e);
    throw e;
  }
 
  return cached.conn;
}
 
export default connectDB;