Jupyter Panel Preview can no longer show the panel-chemistry extension on Binder

[MarcSkovMadsen]

After upgrading to Panel 0.14.0, the panel-chemistry extension no longer shows when using the Panel Jupyter Preview on Binder.

It works in the notebooks.

It is my hypothesis that the new implementation of the Jupyter Panel Preview forgets to serve the assets of bokeh extensions? Maybe only if the are installed via pip install -e .?

Reproduce

1. Open https://mybinder.org/v2/gh/awesome-panel/panel-chemistry/feature/binder-working
2. Open the JSMEEditor.ipynb example notebook and verify it works
3. Open the Jupyter Panel Preview and verify it does not work.

4. Find the link to the Panel application in shown in the preview iframe
5. Open the link
6. Open the Network tab in the browser.
7. Refresh the browser
8. See that the panel_chemistry.js is not found while the panel.min.js is

https://hub.gke2.mybinder.org/user/awesome-panel-panel-chemistry-yjyfkah4/panel-preview/static/extensions/panel/panel.min.js?v=514f2a7b05a1ef2ad45a3b4321cf452aee6fe7b50d0be86fd33ffe9a1990db1d

https://hub.gke2.mybinder.org/user/awesome-panel-panel-chemistry-yjyfkah4/panel-preview/static/extensions/panel_chemistry/panel_chemistry.js?v=77e3b0df3cc2634331ad7f8f5afc2924308e4108dec5f2839a37662d082ac218

Additional Context

You can find the example branch here https://github.com/awesome-panel/panel-chemistry/tree/feature/binder-working

[philippjfr]

Can't get that binder branch to build which makes this pretty difficult to debug.

[philippjfr]

Okay, figured it out. Need to communicate any changes to the bokeh.embed.bundle.extension_dirs dictionary back to the main process.

[MarcSkovMadsen]

Thanks. Unfortunately Binder is becoming more and more slow and instable.

[maximlt]

Yes, they lack 💰 and are badly affected by crypto miners.