Fail to evaluate notebooks when compiling Jupyter Book: no running kernel

[aritmos]

Describe the bug

Already opened an issue in the Jupyter Book repo but think it is perhaps more appropriate here. For reproducibility and environment see the original issue.

context When I try to compile a newly created jupyter book, the mystnb.eval throws an error stating that there is no running kernel for the document. I use Jupyter Labs with the myst extension. The evaluation works perfectly fine within the notebook and the kernel is always idling when trying to compile the book.

bug (?) The error stems from this branch in the code caused by element.renderer.nb_client to return a NotebookClientDirect, which to my understanding does not override the unimplemented eval_variable method from NotebookClientBase. To my understanding the only way to elide this is by handling a NotebookClientInline which does appear to implement the method. However I have only lightly glanced at the codebase so I'm not too certain on the real cause of the error.

Reproduce the bug

see original issue

List your environment

see original issue

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[aritmos]

Issue is solved by adding

execute:
  execute_notebooks: inline

to the _config.yaml in Jupyter Book, despite this value not being in the allowed set and throwing a warning on compilation