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kotlinlang

it still seems unclear whether to use `callbackFlow` vs `channelFlow`. It seems the latter respects operator fusion, but the prior does not?

One of them will throw an exception if you don't call `awaitClose` .

Only use `callbackFlow` if you're dealing with callbacks. Use `channelFlow`  otherwise.

The only difference between them is the exception throwing.

I'm trying to think why I would ever want to use `channelFlow` because my only use case for it is to register/unregister callbacks

Some people want to do concurrent `emit` .

hmm why not just `flow { .. }` ? i thought that builder was main selling point of flow

Because as soon as the provided lambda to the `flow` call ends/returns, the `Flow` that it returns ends/completes.

The callback/channelFlow builders provide a suspending awaitClose method allowing this lambda to suspend indefinitely.