Model.bulkWrite() hangs forever when run on an empty list and ordered: false

[JavaScriptBach]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

7.4.1

Node.js version

18.14.0

MongoDB server version

6.0.5

Typescript version (if applicable)

No response

Description

Running Model.bulkWrite([], {ordered: false}) hangs forever. This is broken on 7.4.1 and 6.11.4. It works correctly on 6.8.4.

Scanning the changelog, I suspect the issue is #13218, but I did not look too closely.

Steps to Reproduce

https://github.com/JavaScriptBach/test-mongoose-bulkwrite/tree/main

Expected Behavior

The call completes and returns.

[JonathanSun]

The reproduction link doesn't work for me, by the way (gives 404).

[JavaScriptBach]

Fixed now. (I accidentally made the repo private)

[IslandRhythms]

const mongoose = require('mongoose');

const testSchema = new mongoose.Schema({
  name: String
});

const Test = mongoose.model('Test', testSchema);

async function run() {
  await mongoose.connect('mongodb://localhost:27017');
  await mongoose.connection.dropDatabase();

  await Test.bulkWrite([], {ordered: false});
  console.log('done');
}

run();

[JavaScriptBach]

@vkarpov15 would you be willing to backport this fix onto Mongoose 6 as well? It would be very much appreciated!

[JavaScriptBach]

#13701

[JavaScriptBach]

@vkarpov15 thanks. 6.11.6 no longer hangs forever, but it makes Model.bulkWrite([]) throw an error, whereas before it used to just silently continue. This is arguably a backwards incompatible change depending on what the documented behavior is. Wanted to flag to you so you're aware