How do I launch jupyter lab with the dark theme enabled by default?

Question

The answer to this question points out that the "JupyterLab Dark" theme is now available as part of a vanilla jupyter-lab install.

How can I configure jupyter-lab so that it launches with this theme already applied on the first launch, so I don't have to manually select it every time I launch my jupyter docker container?

Answer 1

Put this in ~/.jupyterlab/user-settings/@jupyterlab/apputils-extension/themes.jupyterlab-settings

{
    "theme": "JupyerLab Dark"
}

In the Dockerfile this might look like:

RUN mkdir -p ~/.jupyterlab/user-settings/@jupyterlab/apputils-extension/ && \
    echo '{ "theme":"JupyterLab Dark" }' > themes.jupyterlab-settings