CoffeeScript in JupyterLab
conda install -c conda-forge jupyterlab nodejs=8
or
# get nodejs somehow ¯\_(ツ)_/¯
pip install jupyterlab
jupyter labextension install @deathbeds/jyve-kyrnel-coffee-unsafe
@deathbeds/jyve-kyrnel-coffee-unsafe
is built as part of Jyve.