DeprecationWarning from MongoClient

[bailor1]

Describe the bug When used with MongoDB v5, the following deprecation warning is displayed due to the usage of isConnected() within multer-gridfs-storage:

(node:19016) DeprecationWarning: isConnected is deprecated and will be removed in the next major version

Environment

• I'm using multer-gridfs-storage version 5.0.2

• My installed MongoDb version is 5.0.8

• I have Multer 1.4.3 installed to upload files

• The Node version used to run the code is 17.4.0

To Reproduce Simply create a new GridFsStorage in node. I traced the depreciation from the new GridFsStorage() call (not including parameters because they're irrelevant to the deprecation):

    at GridFsStorage._updateConnectionStatus (myapp/node_modules/multer-gridfs-storage/lib/gridfs.js:407:33)
    at GridFsStorage._setDb (myapp/node_modules/multer-gridfs-storage/lib/gridfs.js:446:14)
    at GridFsStorage._connect (myapp/node_modules/multer-gridfs-storage/lib/gridfs.js:335:18)
    at new GridFsStorage (myapp/node_modules/multer-gridfs-storage/lib/gridfs.js:91:14)
    at singleFileUpload (myapp/api/src/routes/file.js:46:21)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

The warning occurs because of the isConnected() call in the following screenshot:

The warning is thrown within myapp/node_modules/mongodb/lib/mongo_client.js:

Expected behavior Not showing the warning/the package no longer being deprecated

[bailor1]

Perhaps this Mongo documentation about moving away from isConnected() could be of use: https://mongodb.github.io/node-mongodb-native/3.3/reference/unified-topology/

[devconcept]

If you check the code you'll see that the isConnected function is only executed if is present. When the function is finally removed it will not be used anymore and the library will still work. The warning is the price to pay for compatibility.