When defining a type renderer in kotlin-jupyter for library such as https://github.com/Kotlin/kotlin-jupyter/blob/master/libraries/krangl.json#L21 , is it possible to add another renderer for a package-internal class? I'd love to add support for

krangl.GroupedDataFrame

but this class is package-internal, and I'm somehow reluctant to make it part of the public library API just to get a more pretty rendering in jupyter. For corresponding sources see https://github.com/holgerbrandl/krangl/blob/master/src/main/kotlin/krangl/GroupedDataFrame.kt#L15

Soon you'll be able to add jupyter integration for your library like that: https://github.com/nikitinas/dataframe/blob/master/src/main/kotlin/org/jetbrains/dataframe/jupyter/Integration.kt You may also use internal types there (apart from other benefits)

Thanks @Ilya Muradyan for the pointer. That's super cool. Is this in jupyter-kernel master already? How would I tell the kernel where to find my libraries impl of

JupyterIntegration

It's not yet in master, but in notebook-api branch. We're now working on clearing and prettying this API, I hope it will be released soon.

Looking forward to it!

About saying kernel of your integration impl: you need a small text file with your implementation FQN in JAR resources, kernel is looking for it and loads it. To simplify the process of bundling this file, we're providing a Gradle plugin, you may find how it's used in dataframe's build.gradle

Sounds wonderful and easy to me.

Regarding features of krangl and dataframe: I believe they do not include each other, but @Anatoly Nikitin should know better.