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I've read all about `Flow`s and I still do not understand if/how I can replace channels with flows in my library. I really need to be able to do `.send` on the one side and iterate when reading on the other side, but at the same time I need to transform the data using `map` and `filter`, which are obsolete for channels.

They are simply a way to expose cold streams.

In your case your can use a Channel still for sending but pass around a Flow for receiving.

additionally, you can create your own flow by simply doing <https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/flow.html>

its a little more restricted than a channel, since it's a cold stream -- coroutine does not run until first request

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