Rxjs combining bufferCount and bufferTime

Using Rxjs, I'm looking for a way to create an observable that

• buffers N events
• OR buffer what it can under an interval.

After a certain time interval, it emits what has been accumulated till then.

I looked into bufferCount and bufferTime. However, I am unable to understand how to combine both behaviors such that it guarantees at least one to be fulfilled. so that all events are processed.

The bufferTime operator allows you to specify an optional max buffer size. So you can do something like this:

bufferTime(2000, null, 5) // <-- buffer emits @ 2000ms OR when 5 items collected