Solution:
Deactivate firewall and run the following command in a windows command prompt:
jupyter lab build
The details:
This turned out to be a firewall problem, and I'm not sure why it would not be prompted as such in the JupyterLab interface. The following command in a windows command prompt returned the error message below:
Command:
jupyter lab build
Output:
C:>jupyter labextension list JupyterLab v0.34.9 Known labextensions:
app dir:
C:\Users*******\AppData\Local\Continuum\anaconda3\share\jupyter\lab
@jupyterlab/plotly-extension v0.18.2 enabled ok
Build recommended, please run jupyter lab build:
@jupyterlab/plotly-extension needs to be included in build
C:>jupyter lab build [LabBuildApp] JupyterLab 0.34.9 [LabBuildApp]
Building in
C:\Users*******\AppData\Local\Continuum\anaconda3\share\jupyter\lab
[LabBuildApp] > node
C:\Users*******\AppData\Local\Continuum\anaconda3\lib\site-packages\jupyterlab\staging\yarn.js
install yarn install v1.9.4 info No lockfile found. [1/4] Resolving
packages... error An unexpected error occurred:
"https://registry.yarnpkg.com/@jupyterlab%2fapplication: self signed
certificate in certificate chain". info If you think this is a bug,
please open a bug report with the information provided in
"C:\Users\*******\AppData\Local\Continuum\anaconda3\share\jupyter\lab\staging\yarn-error.log".
What pointed me towards suspecting a firewall problem was this part:
self signed certificate in certificate chain
Running the same command on less rigid fire-wall settings triggers this output (shortened):
WARNING in d3-array Multiple versions of d3-array found:
1.2.4 ./~/d3-scale/~/d3-array from ./~/d3-scale/~/d3-array\src\index.js
2.2.0 ./~/d3-array from ./~/d3-array\src\index.js
Check how you can resolve duplicate packages:
https://github.com/darrenscerri/duplicate-package-checker-webpack-plugin#resolving-duplicate-packages-in-your-bundle
Child html-webpack-plugin for "index.html":
1 asset
Entrypoint undefined = index.html
[KTNU] ./node_modules/html-loader!./templates/partial.html 567 bytes {0} [built]
[YuTi] (webpack)/buildin/module.js 497 bytes {0} [built]
[aS2v] ./node_modules/html-webpack-plugin/lib/loader.js!./templates/template.html
1.22 KiB {0} [built]
[yLpj] (webpack)/buildin/global.js 489 bytes {0} [built]
+ 1 hidden module
And despite some warning messages, JupyterLab now produces plotly figures without any problems:
