const Storage = require('gridstorage');
const mongo = require('mongodb');
const { MongoClient } = mongodb

MongoClient.connect(uri, (err, db) => {
  if (err) {
    throw new Error(err);
  }
  const storage = new Storage(mongo, db);

const Storage = require('gridstorage');
const mongoose = require('mongoose');

const storage = new Storage(mongoose);

const videoBucket = storage.bucket('videos');

if (await videoBucket.count(filename) > 0) {
  return next('Video exists');
}