I currently have a SvelteKit/NodeJS project that needs to connect to MongoDB. I’ve made a file to handle caching an instance of a MongoDB client to use, but when I run the code, it returns the error:
Promise must be a function, got undefined
MongoError@http://localhost:3000/node_modules/.vite/mongodb.js?v=5d182f1b:101:11
MongoDriverError@http://localhost:3000/node_modules/.vite/mongodb.js?v=5d182f1b:145:9
Here is the file that I am using to connect to my DB:
import { MongoClient } from 'mongodb';
import dotenv from 'dotenv';
dotenv.config();
export const MONGODB_URI = process.env['MONGODB_URI'];
export const MONGODB_DB = "ttrack";
if (!MONGODB_URI) {
throw new Error('Please define the mongoURI property inside config/default.json');
}
if (!MONGODB_DB) {
throw new Error('Please define the mongoDB property inside config/default.json');
}
/**
* Global is used here to maintain a cached connection across hot reloads
* in development. This prevents connections growing exponentially
* during API Route usage.
*/
let cached = global.mongo;
if (!cached) {
cached = global.mongo = { conn: null, promise: null };
}
export const connectToDatabase = async () => {
if (cached.conn) {
return cached.conn;
}
if (!cached.promise) {
const opts = {
useNewUrlParser: true,
useUnifiedTopology: true
};
cached.promise = MongoClient.connect(MONGODB_URI, opts).then((client) => {
return {
client,
db: client.db(MONGODB_DB)
};
});
}
cached.conn = await cached.promise;
return cached.conn;
}
I’m unsure how to proceed with this, as I haven’t been able to find any other documentation on this error for MongoDB (I have found some for mongoose, but they do not apply to my project). Could it possibly be a localhost error? I tracked it down to a function called require_promise_provider, but I have no clue where to go from there. Any help would be awesome!