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`BroadcastChannel` drops items if there are no subscribers. Is there a way to not drop but buffer? Looking for something with `UnicastSubject` behaviour.

I think you just need to pass a positive `capacity` value to the BroadcastChannel factory function
<https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.channels/-broadcast-channel.html>

Nope, this is stated in docs: "Note: this channel looses all items that are send to it until the first subscriber appears;"

I can’t find that, do you remember where? AFAIK, BroadcastChannel doesn’t impose that limitation

Just open the link you provided :slightly_smiling_face:

Sounds like you need a cold stream, actually. How about a buffered Flow?

From my point of view Flow will not buffer anything unless subscribed. Isn't it?

<https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/buffer.html>

Yes, Flow is cold, will not buffer before start subscribing on it.
You can just open subscription on this channel and do not consume elements, so it will start buffering