text: import mongoose from "mongoose";
  
  const MONGODB_URI = process.env.MONGODB_URI;
  
  if (!MONGODB_URI) {
    throw new Error(
      "Please define the MONGODB_URI environment variable inside .env.local"
    );
  }
  
  let cached = global.mongoose;
  
  if (!cached) {
    cached = global.mongoose = { conn: null, promise: null };
  }
  
  async function dbConnect() {
    if (cached.conn) {
      return cached.conn;
    }
  
    if (!cached.promise) {
      const opts = {
        bufferCommands: false,
      };
  
      cached.promise = mongoose.connect(MONGODB_URI, opts).then((mongoose) => {
        return mongoose;
      });
    }
    cached.conn = await cached.promise;
    return cached.conn;
  }
  
  export default dbConnect;
  